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Open Access Article
1 - Semi-analytic algorithms for the electrohydrodynamic flow equation
Ram K Pandey Vipul K Baranwal Chandra S Singh Om P Singh -
Open Access Article
2 - Damping effects in ^{100}Sn ^{+ 16}O and ^{100}Sn ^{+ 16Ca} collisions
Hossein Sadeghi Mahdieh Ghafouri -
Open Access Article
3 - A new approach for data visualization problem
MohammadReza Keyvanpour Mona Soleymanpour -
Open Access Article
4 - Quadrotor Control Using Fractional-Order PI^λ D^μ Control
Reham Mohammed -
Open Access Article
5 - A Version Numbering Scheme for Informational Objects Used in VM Live Migration
Majid Tajamolian Mohammad Ghasemzadeh -
Open Access Article
6 - Developing a Mixed Integer Quadratic Programing Model with Integer Numbers for Designing a Dynamic closed-loop Logistics Network
Ehsan Yadegari Akbar Alem-Tabriz Mostafa Zandieh Behrouz DorriLogistics Network Design includes network configuration decisions having long-standing influences on other tactical and operational decisions. Recently, regarding environmental issues and customer awareness and global warming closed-loop supply chain network design is t MoreLogistics Network Design includes network configuration decisions having long-standing influences on other tactical and operational decisions. Recently, regarding environmental issues and customer awareness and global warming closed-loop supply chain network design is taken into consideration. The proposed network for the integrated forward and reverse logistics is developed by formulating a cyclic logistics network problem which decisions for selecting the places of manufactories, distribution centers, dismantlers and disposal centers with the respective operating units were supported with the maximizing the profit. Moreover, the palaces of suppliers and customer zone are predefined in this model. Therefore, this paper presents a mixed integer quadratic programing for a dynamic multi-period multi-products closed-loop logistics network. The possibility of opening and closing of each facility at each period and expanding the capacities of facilities is the main feature of the proposed model. After model formulation, the credibility and the performance evaluation are investigated by numerical examples. Manuscript profile -
Open Access Article
7 - L_1 operator and Gauss map of quadric surfaces
A. Mohammadpouri L. Kafili R. HosseinoghliThe quadrics are all surfaces that can be expressed as a second degree polynomialin x, y and z. We study the Gauss map G of quadric surfaces in the 3-dimensional Euclidean space R^3 with respect to the so called L_1 operator ( Cheng-Yau operator □) acting on the smooth MoreThe quadrics are all surfaces that can be expressed as a second degree polynomialin x, y and z. We study the Gauss map G of quadric surfaces in the 3-dimensional Euclidean space R^3 with respect to the so called L_1 operator ( Cheng-Yau operator □) acting on the smooth functions defined on the surfaces. For any smooth functions f defined on the surfaces, L_f=tr(P_1o hessf), where P_1 is the1-th Newton transformation associated to the second fundamental form ofthe surface and hessf denotes the self-adjoint linear operator metrically equivalent to the Hessian of, L_1G=(L_1G_1, L_1G_2, L_1G_3), G=(G_1, G_2, G_3). As a result, we establish the classification theorem that the only quadric surfaces with Gauss map G satisfying L_1G=AG for some 3×3 matrix A are the spheres and flat ones. Furthermore, the spheres are the only compact quadric surfaces with Gauss map G satisfying L_1G=AG for some 3×3 matrix A. Manuscript profile -
Open Access Article
8 - The generalized Jacobson’s trace form
امیرحسین نخودکاردر این مقاله فرم رد جیکوبسن را به فرمهای هرمیتی پادمتقارن روی جبرهای تقسیم کواترنیون با برگردان متعامد در مشخصهی دلخواه تعمیم میدهیم. با استفاده از این فرم تعمیمیافته، یک ردهبندی از فرمهای هرمیتی مذکور ارائه مینمائیم. همچنین نشان میدهیم یک فرم هرمیتی ایزوتروپ ( Moreدر این مقاله فرم رد جیکوبسن را به فرمهای هرمیتی پادمتقارن روی جبرهای تقسیم کواترنیون با برگردان متعامد در مشخصهی دلخواه تعمیم میدهیم. با استفاده از این فرم تعمیمیافته، یک ردهبندی از فرمهای هرمیتی مذکور ارائه مینمائیم. همچنین نشان میدهیم یک فرم هرمیتی ایزوتروپ (متابولیک) است اگر و تنها اگر فرم رد جیکوبسن تعمیمیافتهی آن ایزوتروپ (متابولیک) باشد. . Manuscript profile -
Open Access Article
9 - A NUMERICAL SOLUTION FOR THE FRACTIONAL RAYLEIGH-STOKES PROBLEM BY SPACE-TIME RADIAL BASIS FUNCTIONS
Nafiseh Noghrei Asghar Kerayechian Alireza SoheiliIn this paper, we approximate the solution of two-dimensional Rayleigh-Stokes problem ‎for a heated generalized second grade fluid with fractional derivatives. This approximation is ‎based on the space-time radial basis functions (RBFs) and the Sinc quadrature r MoreIn this paper, we approximate the solution of two-dimensional Rayleigh-Stokes problem ‎for a heated generalized second grade fluid with fractional derivatives. This approximation is ‎based on the space-time radial basis functions (RBFs) and the Sinc quadrature rule. In this ‎method, we use Gaussian radial basis function and don't distinguish between time and place ‎variables and the collocation points have both the coordinates of time and space. We use the ‎Sinc quadrature rule with single exponential transformation to approximate the integral part of ‎fractional derivatives. The chosen fractional derivatives is Riemann – Liouville.‎This method is implemented on two examples with different values of the fractional ‎derivative order. Obtained results illustrate the effectiveness of our method and sh ow that ‎one can obtain accurate results with a small number of the collocation points for the radial ‎basis function. It should be noted that all calculations in this paper have been done using ‎Mathematica software.‎ Manuscript profile -
Open Access Article
10 - A Note on Quadratic Maps for Hilbert Space Operators
H.R. Moradi M. Erfanian OmidvarIn this paper, we introducethe notion of sesquilinearmap on Β(H) . Based onthisnotion, we define the quadratic map, which is the generalization of positive linear map. With the help of this concept, we prove several well-known equality and inequality...In this paper, we introducethe notion of sesquilinearmap on Β(H) . Based onthisnotion, we define the quadratic map, which is the generalization of positive linear map. With the help of this concept, we prove several well-known equality and inequality... Manuscript profile -
Open Access Article
11 - Comparing the Efficiency of Dmus with Normal and Skew-Normal Distribution using Data Envelopment Analysis
A. Nazari M. H. BehzadiData envelopment analysis (DEA) is a nonparametric approach to evaluate theefficiency of decision making units (DMU) using mathematical programmingtechniques. Almost, all of the previous researches in stochastic DEA have been usedthe stochastic data when the inputs an MoreData envelopment analysis (DEA) is a nonparametric approach to evaluate theefficiency of decision making units (DMU) using mathematical programmingtechniques. Almost, all of the previous researches in stochastic DEA have been usedthe stochastic data when the inputs and outputs are normally distributed. But, thisassumption may not be true in practice. Therefore, using a normal distribution willbe lead to wrong results. The skew-normal (SN) distribution is one of the importantdistribution in statistics. The SN distribution is an asymmetric distribution which hassimilar properties to a normal distribution and it can be extended to the normaldistributions. In the present study, a stochastic BCC model was proposed formeasuring the stochastic efficiency of DMUs with inputs and outputs having Skew-Normal (SN) distribution. Moreover, it is shown that this model encompasses theBCC model assuming the normality of data as well. The proposed model inmeasuring the efficiency of a bank's 25 branches is used. Manuscript profile -
Open Access Article
12 - A meshless method for optimal control problem of Volterra-Fredholm integral equations using multiquadratic radial basis functions
J. Nazari Meleh H. AlmasiehIn this paper, a numerical method is proposed for solving optimal control problem of Volterra integral equations using radial basis functions (RBFs) for approximating unknown function. Actually, the method is based on interpolation by radial basis functions including mu MoreIn this paper, a numerical method is proposed for solving optimal control problem of Volterra integral equations using radial basis functions (RBFs) for approximating unknown function. Actually, the method is based on interpolation by radial basis functions including multiquadrics (MQs), to determine the control vector and the corresponding state vector in linear dynamic system while minimizing the quadratic cost functional. In addition for greater precision, the included integrals in Volterra integral equation and the cost functional are approximated using Legendre-Gauss-Lobatto nodes and weights. These nodes are considered as collocations points. The optimal control problem is reduced to a minimization so that the control vector and the state vector are considered as an approximation of solution vectors based on radial basis functions. Two numerical examples are presented and results are compared with the analytical solutions to demonstrate the applicability and accuracy of the proposed method. Manuscript profile -
Open Access Article
13 - Weighted quadrature rules with binomial nodes
M. Masjed-Jamei M. R. BeykiIn this paper, a new class of a weighted quadrature rule is represented as -------------------------------------------- where is a weight function, are interpolation nodes, are the corresponding weight coefficients and denotes the error term. The general form of interpo MoreIn this paper, a new class of a weighted quadrature rule is represented as -------------------------------------------- where is a weight function, are interpolation nodes, are the corresponding weight coefficients and denotes the error term. The general form of interpolation nodes are considered as that and we obtain the explicit expressions of the coefficients using the q-binomial theorem. We give an error analysis for the introduced formula and finally we illustrate its application with some numerical examples. Manuscript profile -
Open Access Article
14 - Detection of Stock Price Manipulation using Linear and Quadratic Discriminant Analysis
M. Hossein Poustfroush Alireza Naser Sadrabadi Mahmood MoeinaddinIn this study, Discriminant Analysis (DA) model are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data method, a sample of 345 companies listed in Tehran Stock Exchange were selected and then information MoreIn this study, Discriminant Analysis (DA) model are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data method, a sample of 345 companies listed in Tehran Stock Exchange were selected and then information about the 'TEDPIX' index, closing price, volatility of closing price and trading volume in the time frame years 1387 to 1391 were collected. Afterwards the selected companies categorized into manipulated and non-manipulated groups by using duration dependence test and skewness & kurtosis test. Then with scrutiny of the trend of Tedpix's chart and volume chart of the manipulated group, Start of price manipulation is determined. In next step by using Linear Discriminant Function (LDF) and Quadratic Discriminant Function (QDF) and by using closing price, volatility of closing price and trading volume variables and also using information in range one year before starting manipulation group and in range four years for non-manipulation group, designed models for forecasting manipulation. At the end, the prediction ability of the models was examined. According to the results, the prediction ability of LDF model is 56% and the prediction ability of QDF model is 73%. Manuscript profile -
Open Access Article
15 - Reviews of Manipulating Prices using QDF & ANN-GA Models in Tehran's Stock Exchange
M. Hossein Poustfroush Alireza Naser Sadrabadi Mahmood MoeinaddinIn this study, Quadratic Discriminant Analysis (QDF) model and the hybrid model of Genetic Algorithm based on Artificial Neural Network)ANN-GA) are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data metho MoreIn this study, Quadratic Discriminant Analysis (QDF) model and the hybrid model of Genetic Algorithm based on Artificial Neural Network)ANN-GA) are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data method, a sample of 345 companies listed in Tehran Stock Exchange were selected and then information about the 'TEDPIX' index, closing price, volatility of closing price and trading volume in the timeframe years 1387 to 1391 were collected. Afterwards the selected companies categorized into manipulated and non-manipulated groups by using duration dependence test and run test. Then with scrutiny of the trend of Tedpix's chart and volume chart of the manipulated group, Start of price manipulation is determined. In next step by using Linear Discriminant Function)LDF) ,Quadratic Discriminant Function)QDF) and Genetic Algorithm based Artificial Neural Network and by using closing price, volatility of closing price and trading volume variables and also using information in range one year before starting manipulation group and in range four years for non-manipulation group, designed models for forecasting manipulation. At the end, the prediction ability of the models was examined. According to the results, the prediction ability of QDF model compared to the ANN model is better. Manuscript profile -
Open Access Article
16 - LDF, QDF & ANN-GA based models for stock market surveillance in Tehran's Stock Exchange
M. Hossein Poustfroush Alireza Naser Sadrabadi Mahmood MoeinaddinIn this study, Discriminant Analysis (DA) model and the hybrid model of Genetic Algorithm based on Artificial Neural Network (ANN-GA) are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data method, a sampl MoreIn this study, Discriminant Analysis (DA) model and the hybrid model of Genetic Algorithm based on Artificial Neural Network (ANN-GA) are used to estimate manipulation of stock prices in Tehran Stock Exchange. In this study, first by using screening data method, a sample of 345 companies listed in Tehran Stock Exchange were selected and then information about the 'TEDPIX' index, closing price, volatility of closing price and trading volume in the timeframe years 1387 to 1391 were collected. Afterwards the selected companies categorized into manipulated and non-manipulated groups by using duration dependence test, skewness & kurtosis test and run test. Then with scrutiny of the trend of Tedpix's chart and volume chart of the manipulated group, Start of price manipulation is determined. In next step by using Linear Discriminant Function (LDF), Quadratic Discriminant Function (QDF) and Genetic Algorithm based Artificial Neural Network and by using closing price, volatility of closing price and trading volume variables and also using information in range one year before starting manipulation group and in range four years for non-manipulation group, designed models for forecasting manipulation. At the end, the prediction ability of the models was examined. According to the results, the prediction ability of QDF model compared to the LDF model and ANN model is better. Manuscript profile -
Open Access Article
17 - QSAR study of camptothecin derivatives as anticancer drugs using genetic algorithm and multiple linear regression analysis
fatemeh shafiei Shahaboddin Mohebbi Tahereh Momeni Isfahani Mehdi Ahmadi Sabegh -
Open Access Article
18 - Physicochemical Study of the Interaction of some Water Soluble Porphyrins with Calf Thymus DNA
H. Aghaie M. Keshavarz K. Zare M. Aghaie A.K. Bordbar -
Open Access Article
19 - Spectroscopic study on the interaction of three water-soluble porphyrins with calf thymus DNA
H. Aghaie M. Keshavarz K. Zare A.K. Bordbar F. Gharib -
Open Access Article
20 - Thermodynamic study of interaction between some transition metal ions and L-Alanine
H. Aghaie K. Zare F. Keshavarz Rezaei -
Open Access Article
21 - Complexation of Bis(acetylacetonate)oxovanadium(IV) with D–penicillamine at neutral medium
R. Hakimelahi M.A. Seyed Sadjadi H. Aghaie M. Aghaie -
Open Access Article
22 - Topological relationship between electric quadrupole, hexadecapole moments, energy and Padmakar–Ivan index in armchair polyhex nanotubes TUVC6[2p,q]
Majid Monajjemi Esmat Mohammadinasab Fatemeh Shafiei -
Open Access Article
23 - Thermodynamic study of interaction between phthalocyanines with calf thymus DNA
M. Aghaie F. Naderi M. Monajjemi H. Aghaie N. Safari P.R. Jamaat -
Open Access Article
24 - Thermodynamic Study on the Interaction between Fe2+(aq) ion and LAlanine
K. Zare F. Keshavarz Rezaie F. Soleimani H. Aghaie -
Open Access Article
25 - Thermodynamic Studies on the Interaction of Phthalocyanine with Bovine serum albumin
K. Zare H. Aghaie M. Mirzaie M.R. Zardoost F. Khazali -
Open Access Article
26 - Interaction of Phthalocyanine with Egg albumin and Bovine serum albumin
K. Zare H. Aghaie M. Mirzaie -
Open Access Article
27 - Theoretical study of the effects of substituent and quadrupole moment on π-π stacking interactions with coronene
Pouya Karimi -
Open Access Article
28 - A Recurrent Neural Network for Solving Strictly Convex Quadratic Programming Problems
A. Ghomashi M. Abbasi -
Open Access Article
29 - روش عددی صریح برای سیستمهای دینامیک غیرموضعی با تأخیردر زمان بر پایه درونیابی اسپلاین مربعی
حسن پنج مینی بهروز پارسا مقدم الهام هاشمی زادهدر این مقاله، روشی صریح برای حل عددی معادلات دیفرانسیل غیرموضعی با تأخیر در زمان ارائه و مورد بررسی قرار می گیرد. در روش ارائه شده، درونیابی اسپلاین مربعی بکار گرفته شده است و خطای روش ارائه شده آنالیز گردیده است. کارایی و اعتبار روش پیشنهادی در مدلهای آیکدا و هاتچینسو Moreدر این مقاله، روشی صریح برای حل عددی معادلات دیفرانسیل غیرموضعی با تأخیر در زمان ارائه و مورد بررسی قرار می گیرد. در روش ارائه شده، درونیابی اسپلاین مربعی بکار گرفته شده است و خطای روش ارائه شده آنالیز گردیده است. کارایی و اعتبار روش پیشنهادی در مدلهای آیکدا و هاتچینسون غیرموضعی تأخیری با استناد مفاهیم خطا و همگرایی روشهای عددی به ازای مقادیر مختلف پارامترهای مرتبه کسری نمایان شده است. Manuscript profile -
Open Access Article
30 - کارایی تصادفی مبتنی بر مدل وزن مشترک در تحلیل پوششی داده ها
مرضیه قاسمی محمدرضا ظفری محسن رستمی مال خلیفه محمدحسن بهزادیتحلیل پوششی داده ها (DEA) روشی برای ارزیابی عملکرد مجموعه ای از واحدهای تصمیم گیرنده (DMU) متجانس با چندین ورودی و چندین خروجی می باشد. . مدل های مختلفی برای محاسبه کارایی در DEA وجود دارند که یکی از آن ها، مدل مجموعه وزن های مشترک (CSW) می باشد، که به طور گسترده ای توس Moreتحلیل پوششی داده ها (DEA) روشی برای ارزیابی عملکرد مجموعه ای از واحدهای تصمیم گیرنده (DMU) متجانس با چندین ورودی و چندین خروجی می باشد. . مدل های مختلفی برای محاسبه کارایی در DEA وجود دارند که یکی از آن ها، مدل مجموعه وزن های مشترک (CSW) می باشد، که به طور گسترده ای توسط افراد و متخصصان DEA مورد استفاده قرار می گیرد. در تحلیل پوششی داده های کلاسیک تمام مقادیر ورودی ها و خروجی ها به طور دقیق مشخص می باشند. با این حال این فرض ممکن است در مسائل کاربردی همواره برقرار نباشد. یکی از روش های مهم برای مقابله با داده های نامشخص، بررسی داده های تصادفی در DEA است. این مقاله مدل مجموعه وزن های مشترک را برای حالتی که ورودی ها و خروجی ها تصادفی هستند، توسعه می دهد. سپس مدل تصادفی وزن مشترک (SCSW) به یک مدل قطعی غیر خطی تبدیل می گردد. پس از آن مدل قطعی به یک مدل برنامه ریزی درجه دوم تبدیل می شود. . کارایی به دست آمده با استفاده از داده های تصادفی را کارایی تصادفی می نامیم. مفهوم ارائه شده در این مقاله با مثال عددی که مربوط به شعبه های یک بانک ایرانی است نشان داده می شود. Manuscript profile -
Open Access Article
31 - شبیه سازی عددی معادلات تلگراف هذلولی با استفاده از یک روش بهبودیافته روی توابع B- اسپلاین مکعبی نمایی
احمدرضا حقیقی فروزان رحیمیان نسیم عسگری M. Roohiدر این مقاله استفاده از روش مربع ساز دیفرانسیل، برای تعیین جوابهای عددی معادلات تلگراف دو بعدی و سه بعدی با شرایط مرزی دیریکله و نیومن، پیشنهاد شده است.در این روش منحنی های بی اسپلاین مکعبی نمایی مورد استفاده قرار میگیرند. در نتیجه در روش Moreدر این مقاله استفاده از روش مربع ساز دیفرانسیل، برای تعیین جوابهای عددی معادلات تلگراف دو بعدی و سه بعدی با شرایط مرزی دیریکله و نیومن، پیشنهاد شده است.در این روش منحنی های بی اسپلاین مکعبی نمایی مورد استفاده قرار میگیرند. در نتیجه در روش (مربع ساز دیفرانسیل ) مذکور از یک ضریب مقیاس بندی براساس بی- اسپلاین های مکعبی نمایی استفاده شده است. بنابراین معادلهی تلگراف هذلولوی با استفاده از دستگاهی از معادلات دیفرانسیل معمولی نمایش داده می شود. و برای حل دستگاه معادلات دیفرانسیل حاصل، الگوریتم رانگ-کوتا مرتبهی سوم طی چهارگام به منظور حفظ پایداری سیستم ارایه شده است. درستی و کارایی روش مورد استفاده نیز روی 4 مثال از معادلهی تلگراف مورد بررسی قرار گرفته است. Manuscript profile -
Open Access Article
32 - FGP approach to multi objective quadratic fractional programming problem
K. Lachhwani -
Open Access Article
33 - Application of CAS wavelet to construct quadrature rules for numerical integration
S. Rezabeyk KH. Maleknejad -
Open Access Article
34 - The Solution of Fully Fuzzy Quadratic Equations Based on Restricted Variation
L. Gerami ‎Moazam -
Open Access Article
35 - On Optimal Quadrature Rule for Solving Fuzzy Fredholm Integral Equations
R. Ezzati M. M. Sadatrasou -
Open Access Article
36 - Ground-Based Methods for Direct Measuring of Leaf Area Index (LAI)
Seyed Mohammad Moein Sadeghi Naseh MiriBackground and Objectives: Leaf Area Index (LAI) is one of the most important structural parameters in agricultural, range and forest ecosystems and variation of energy, water, and gases are tightly coupled to LAI. According to the novelty of LAI research in Iran, this MoreBackground and Objectives: Leaf Area Index (LAI) is one of the most important structural parameters in agricultural, range and forest ecosystems and variation of energy, water, and gases are tightly coupled to LAI. According to the novelty of LAI research in Iran, this study aimed to evaluate different direct ground-based methods for determining LAI. Material and Methodology: This research has been done by literature reviews by using internet databases. There are two main categories of procedures to measure LAI: ground-based and remote sensing methods, and ground-based methods divided into direct and indirect (estimation) methods. Findings: Although, in the past two decades, the tendency to use indirect ground-based as well as remote sensing methods for estimating g LAI has increased, but for reasons such as needing semi-sophisticated and sophisticated instruments and lack of free access to satellite images in the greater part of the world, caused the direct ground-based methods for calculating LAI has been widely used. Moreover, the high precision and accuracy of direct ground-based methods compared to direct ground-based and remote sensing methods is another reason for preferring direct ground-based methods. Discussion and Conclusion: The results of this study showed that the Litter Trap method could be the most efficient method for measuring LAI, and we proposed this method in future research, concerning very less destruction to nature as well as high accuracy and precision. Manuscript profile -
Open Access Article
37 - Study on Sunitinib Adsorption on Graphene Surface as an Anticancer Drug
Sepideh Tanreh Abolghasem Shameli Ebrahim Balali -
Open Access Article
38 - Analysis and study of four-quadratic analog current mode multipliers in terms of linearity and overall harmonic distortion
Hamid Bashi Seyed Ali Hosseini Abolfazl Amiri Analog multiplication of two signals is one of the most important applications in signal processing. The main motivation for choosing an analog current multiplier is its importance in the function of nonlinear analog signal processing. The multiplier is used as a More Analog multiplication of two signals is one of the most important applications in signal processing. The main motivation for choosing an analog current multiplier is its importance in the function of nonlinear analog signal processing. The multiplier is used as a programming element in systems such as filters, neural networks, and as mixers and modulators in a telecommunications system. And are widely used in end-of-life frequency modulation conversion control filters for fuzzy integrated systems and so on. Quadruple multiplication has a non-linear function in signal processing that is very useful for communication equipment and control systems, and CMOS technology is widely recognized as the most desirable technology for implementing integrated circuits. Therefore, comparison and evaluation of current quadruple multipliers in terms of power consumption, total THD harmonic distortion, frequency response, linearity, speed, input voltage range, input current range, noise, power supply, and other parameters affecting quadruple current multiplier circuits are necessary to achieve a multiplier with proper performance and use in specific applications. Manuscript profile -
Open Access Article
39 - Quadruple analog multiplier with high-frequency response
Hamid Bashi Seyed Hadi Mosavi Abolfazl AmiriField Effect Carbon Nanotube Transistor (CNFET) is a promising and new technology that overcomes the traditional limitations of integrated silicon circuit technology. In recent years, the potential of CNFET for analog circuit applications has been exploited. This paper MoreField Effect Carbon Nanotube Transistor (CNFET) is a promising and new technology that overcomes the traditional limitations of integrated silicon circuit technology. In recent years, the potential of CNFET for analog circuit applications has been exploited. This paper presents a quadratic analog multiplier using CNFETs. designed. The simulation-based on 32nm CNFET technology shows that the multiplier has very low harmonic distortion (less than 0.45%), large input range (±400 mv), high bandwidth (50 ~ GHz) and low power consumption (247 ~ μW), in While at the supply voltage it is ±0.9 volts. Manuscript profile -
Open Access Article
40 - A new method of improving fractal image compression by combining block classification and quadratic tree division
Jaleh Molaye Zahedi Hamid Dehghani Alireza MalahzadehHere, to improve the quality of the reconstructed image, a kind of fractal compression method is proposed, which is based on block classification and quadratic tree segmentation. First, the image is divided by an adaptive quadruple tree method. Sub-blocks are then class MoreHere, to improve the quality of the reconstructed image, a kind of fractal compression method is proposed, which is based on block classification and quadratic tree segmentation. First, the image is divided by an adaptive quadruple tree method. Sub-blocks are then classified at each level. Experimental results show that the image reconstructed and amplified by this method has a higher peak-to-peak signal-to-noise ratio (PSNR) and a better visual effect than the adaptive quadratic splitting method, while the compression ratio Has also increased. Manuscript profile -
Open Access Article
41 - Simulation and investigation of parameters affecting the reduction of power consumption in multiplication circuits using CNT transistor technology
abdolrasoul moghateli hosssein momenzadeh Mohammad Nader KakaiAnalog multipliers are useful blocks used in implementing functions such as automatic control, modulation, detectors, adaptive filters, and neural networks. In this paper, we present a new four-quadratic analog multiplier based on carbon nanotube transistors. Newly desi MoreAnalog multipliers are useful blocks used in implementing functions such as automatic control, modulation, detectors, adaptive filters, and neural networks. In this paper, we present a new four-quadratic analog multiplier based on carbon nanotube transistors. Newly designed current square circuits and a current mirror, all operating at low voltage (1V), are essential components in realizing mathematical equations. The multiplier circuit is designed using CNTFET technology, 32 nm, and the multiplier provided in the HSPICE simulator is simulated to validate the circuit performance. The simulation results showed that the circuit has the desired performance up to a frequency of 2 GHz and shows a maximum power consumption of 3.7464uw and also has a THD of 0.226043%. Manuscript profile -
Open Access Article
42 - effect of G-quadruplex on aromaticity of phenanthroline based ligands: mlecular dynamics simulation and density functional theory methods
Mohadese Bazobandi Mohammad Reza Bozorgmehr Ali Mahmoudi Ali MorsaliG-quadruplexes are biostructures that are used as biomarkers. These compounds are composed of four guanine sheets. Studying the interaction of G-quadruplex with planar ligands is very important. In this work, the effect of G-quadruplex on the aromaticity of three phenan MoreG-quadruplexes are biostructures that are used as biomarkers. These compounds are composed of four guanine sheets. Studying the interaction of G-quadruplex with planar ligands is very important. In this work, the effect of G-quadruplex on the aromaticity of three phenanthroline based ligands was studied by molecular dynamics simulation and density functional theory. The investigated ligands are: N,N'-(dibenzo [b,j] [1,7]phenanthroline-2,10-diylbis (methylene)) die-thanamine (L1), N,N'-(dibenzo [b,j] [1,7] phenanthroline-2,10diylbis (methylene)) bis (N-methylpropan-1-amine) (L2) and N1-(dibenzo [b, j] [1,7] phenanthroline-7-ylmethyl)-N3 -methy lpropane-1,3-diamine (L3) which have 5 aromatic rings in their structure. To check the effect of temperature, calculations were repeated at four temperatures of 20, 40, 60 and 80 degrees Celsius. The HOMA index was calculated as an index of the aromaticity of the rings. The obtained results show that the L1 ligand has higher aromaticity than the other two ligands. Also, as the temperature increases, the aromaticity of the ligand rings decreases. On the other hand, the terminal two rings of the ligands are more affected by G-quadruplex. In general, the aromaticity of the five-membered rings of the ligands increases with the interaction with the G-quadruplex. Manuscript profile -
Open Access Article
43 - Comparative Study and Robustness Analysis of Quadrotor Control in Presence of Wind Disturbances
Reham Mohammed -
Open Access Article
44 - Numerical Study of Microbeam with Geometric Discontinuity Under Electrostatic Load using Strain Gradient Theory
Hadi Hamidizadeh Mahmoud Mousavi Mashhadi Younes Mohammadi -
Open Access Article
45 - Free Vibration of Defective Nanographene using Molecular Dynamics Simulation and Differential Quadrature Method
Hossein Golestanian ali khodadadi mahmoud haghighi -
Open Access Article
46 - Comparison of intellectual preferences among female students of the second, third and fourth grades of mathematics sciences at Mashhad secondary schools
hanieh golmagham Ali Ghanaei ghaman abad Ali asghar Asghar nejatThe purpose of this study was the comparison of intellectual preferences among female students of the second, third and fourth grades of mathematics’ sciences at Mashhad secondary schools. In this descriptive-survey research, the population was consisted of the total of MoreThe purpose of this study was the comparison of intellectual preferences among female students of the second, third and fourth grades of mathematics’ sciences at Mashhad secondary schools. In this descriptive-survey research, the population was consisted of the total of female students of the high schools of Mashhad in the second, third and forth grades of mathematics field in 2010-2011. The sample was included 133 high school students ( 39 students at the second grade, 50 students at the third grade and 42 students at the fourth grade) who studied mathematics. They were chosen by using cluster sampling method from different regions of Mashhad. The short form of Ned Hermann questionnaire was used. Statistical analysis was done by descriptive and inferential statistic. The collected data was analyzed through ANOVA, Mono-vamethodes and Tukey follow-up test. The results indicated that the mean score of D-quadrant was decreased significantly (F = 3.17, p < 0.045) and D-quadrant brain dominance was decreased significantly (p < 0.05) from the second grade to the fourth grade. The findings of the present research showed that the current process in the field of mathematics education did not provide the development of students' brain ability. Therefore, evaluating of the curriculum and teacher's method of teaching in this field by competent authorities seems to be necessary. Manuscript profile -
Open Access Article
47 - The Relationship Between Learning Styles And Brain Quadrants Dominance Of Students
Mohammad Reza Nazemi Hasan ToozandehjaniThe present study was to investigate the relationship between learning styles of students was conducted brain dominance quarterdesigned and completed descriptively with correlation design. This descriptive correlational study was designed. Statistical Society of t MoreThe present study was to investigate the relationship between learning styles of students was conducted brain dominance quarterdesigned and completed descriptively with correlation design. This descriptive correlational study was designed. Statistical Society of this research consisted of all secondary school students in the Mashhad were enrolled in the academic year 93- 94. The sample included 380 students of middle schools of Mashhad city. Herman’s brain dominanceand Kolb's learning styles questionnaires were administered by members of sample. The Research results showed that learning styles and brain quadrants dominance have a significant relationship, so that there are positive significant relationships between diverging and assimilating learning styles with D & C brain quadrants and between Converging and accommodating learning styles with A & B brain quadrants. Because of its flexibility and ability to change in the brain, the experience of learning styles can cause changes in the brain and control over different parts of the brain causes. Given the importance of student achievement and effect styles learning behavioral and cognitive function in the brain, which need further education in learning styles of each student for teachers and coaches to be considered. Manuscript profile -
Open Access Article
48 - Effect of Winkler Foundation on Radially Symmetric Vibrations of Bi-Directional FGM Non-Uniform Mindlin’s Circular Plate Subjected to In-Plane Peripheral Loading
N Ahlawat R Lal -
Open Access Article
49 - On The Free Vibration of Doubly Clamped Single-Walled Coiled Carbon Nanotubes: A Novel Size Dependent Continuum Model
F Darvishi O Rahmani -
Open Access Article
50 - Vibration and Stability Analysis of Composite Tube Conveying Fluid Flow Equipped with Piezoelectric Ring
M Nazarzadeh Ansarodi H Biglari M.R Saviz -
Open Access Article
51 - Buckling Analyses of Rectangular Plates Composed of Functionally Graded Materials by the New Version of DQ Method Subjected to Non-Uniform Distributed In-Plane Loading
R Kazemi Mehrabadi V.R Mirzaeian -
Open Access Article
52 - Global Optimization of Stacking Sequence in a Laminated Cylindrical Shell Using Differential Quadrature Method
M.R Saviz A Ziaei Asl -
Open Access Article
53 - Stress Analysis of Skew Nanocomposite Plates Based on 3D Elasticity Theory Using Differential Quadrature Method
M.R Nami M Janghorban -
Open Access Article
54 - Generalized Differential Quadrature Method for Vibration Analysis of Cantilever Trapezoidal FG Thick Plate
K Torabi H Afshari -
Open Access Article
55 - In-plane Band Gaps in a Periodic Plate with Piezoelectric Patches
H.J Xiang Z.B Cheng Z.F Shi X.Y Yu -
Open Access Article
56 - Static Analysis of Functionally Graded Annular Plate Resting on Elastic Foundation Subject to an Axisymmetric Transverse Load Based on the Three Dimensional Theory of Elasticity
A Behravan Rad A Alibeigloo S.S Malihi -
Open Access Article
57 - Effect of Surface Energy on the Vibration Analysis of Rotating Nanobeam
M Safarabadi M Mohammadi A Farajpour M Goodarzi -
Open Access Article
58 - A Simple and Systematic Approach for Implementing Boundary Conditions in the Differential Quadrature Free and Forced Vibration Analysis of Beams and Rectangular Plates
S.A Eftekhari -
Open Access Article
59 - Dynamic Analysis of Multi-Directional Functionally Graded Panels and Comparative Modeling by ANN
H Khoshnoodi M.H Yas A Samadinejad -
Open Access Article
60 - Exact Implementation of Multiple Initial Conditions in the DQ Solution of Higher-Order ODEs
S.A Eftekhari -
Open Access Article
61 - Nonlocal Bending Analysis of Bilayer Annular/Circular Nano Plates Based on First Order Shear Deformation Theory
Sh Dastjerdi M Jabbarzadeh -
Open Access Article
62 - Non-Local Thermo-Elastic Buckling Analysis of Multi-Layer Annular/Circular Nano-Plates Based on First and Third Order Shear Deformation Theories Using DQ Method
Sh Dastjerdi M Jabbarzadeh -
Open Access Article
63 - A meshless technique for nonlinear Volterra-Fredholm integral equations via hybrid of radial basis functions
Jinoos Nazari Homa AlmasiehIn this paper, an effective technique is proposed to determine thenumerical solution of nonlinear Volterra-Fredholm integralequations (VFIEs) which is based on interpolation by the hybrid ofradial basis functions (RBFs) including both inverse multiquadrics(IMQs), hyperb MoreIn this paper, an effective technique is proposed to determine thenumerical solution of nonlinear Volterra-Fredholm integralequations (VFIEs) which is based on interpolation by the hybrid ofradial basis functions (RBFs) including both inverse multiquadrics(IMQs), hyperbolic secant (Sechs) and strictly positive definitefunctions. Zeros of the shifted Legendre polynomial are used asthe collocation points to set up the nonlinear systems. Theintegrals involved in the formulation of the problems areapproximated based on Legendre-Gauss-Lobatto integration rule.This technique is so convenience to implement and yields veryaccurate results compared with the other basis. In addition aconvergence theorem is proved to show the stability of thistechnique. Illustrated examples are included to confirm thevalidity and applicability of the proposed method. The comparisonof the errors is implemented by the other methods in referencesusing both inverse multiquadrics (IMQs), hyperbolic secant (Sechs)and strictly positive definite functions. Manuscript profile -
Open Access Article
64 - A Chance-Constrained DEA Model with Random Input and Output Data:Considering Maintenance Groups of Iranian Aluminum Company
Mohammad Izadikhah Mohammad Ehsanifar Saman Malekian -
Open Access Article
65 - Efficiency of 1x1 meter quadrat for estimating of over-wintered adults of Eurygaster integriceps Put. (Hem., Scutelleridae) populations in rainfed wheat field
A. Mohseni AminThis research was carried out to evaluate different aspects of one square meter quadrat size to estimate sunn pest over-wintered adults, Eurygaster integriceps Put.(Hem., Scutelleridae) in rainfed wheat field of Borujerd, north of Lorestan province, Iran, during 2003 an MoreThis research was carried out to evaluate different aspects of one square meter quadrat size to estimate sunn pest over-wintered adults, Eurygaster integriceps Put.(Hem., Scutelleridae) in rainfed wheat field of Borujerd, north of Lorestan province, Iran, during 2003 and 2004. Iwao’s regression had higher determination coefficients (r2=0.93) and showed a better fit as compared to r2 values calculated by Taylor’s power law (r2=0.86). Iwao’s patchiness regression slope (β=1.07±0.05) was not significantly larger than 1.0. Consequently, random dispersion pattern was determined for over-wintered adults in rainfed wheat fields. Therefore, Kuno’s fixed precision sequential sampling scheme based on Iwao’s parameters was constructed for overwintered adults of E. integriceps. An additional nine independent data sets, was used to validate the fixed-precision sequential sampling plans with resampling software of RVSP. Sample size curves indicated that estimating over-wintered adult population in rainfed field can be accomplished with a few sampling efforts when population is >2 insects per quadrat. For example only six samples need to be taken for the over-wintered adults, on average to achieve a precision of 0.25 (Dexp=0.25) when =3 insects per quadrat. However, sample sizes increase suddenly when population density is less than 0.3 insects per quadrat. Based on these results, 1*1m quadrat is not recommended to estimate number of over-wintered adults in rainfed wheat field. Manuscript profile -
Open Access Article
66 - "He constructed for him a tomb by “som” of hoofed quadrupeds"
Hamidreza Shaygan FarOne of the masterpieces of Persian literature is the epic of “Rostam and Sohrâb”. One of the difficult couplets In this story, is at a time when Sohrâb is killed by mistake by Rostam and Rostam wants to construct a tomb for him; Rostam says: &ld MoreOne of the masterpieces of Persian literature is the epic of “Rostam and Sohrâb”. One of the difficult couplets In this story, is at a time when Sohrâb is killed by mistake by Rostam and Rostam wants to construct a tomb for him; Rostam says: “If I construct a golden tomb for Sohrâb, when I leave the tomb, it will not abide; accordingly he construct a tomb with an underground cote (or hoofs) of hoofed quadrupeds (The word of “som” in Persian language conveys two meanings: 1.hoof, 2. underground cote). Researchers asked: why Rostam says such speaking? And why Rostam construct a tomb with underground cote (or hoofs) of hoofed quadrupeds. They tried to answer these questions with mythological approach and they disregard to atmosphere of the story. The author attempted to answer to these questions by considering the atmosphere of the story. In this tragedy, Sohrâb numbered an enemy; therefore if Rostam constructed a trimmed tomb for Sohrâb, the Iranian soldiery might to destroy that tomb; therefore Rostam chose an underground cote to bury Sohrâb and then hid the ground. Manuscript profile -
Open Access Article
67 - The Effect of an Acute PNF Stretching on the Rate of Force Development of Hamstring and Quadriceps Muscles among Athletes with Dynamic Knee Valgus
Fatemeh Alizadeh Parastoo ShamsehKohanIntroduction: PNF stretching is used to improve maximum muscle function, reduce muscle damage, reduce muscle stiffness and increase joint mobility before exercise. As a result, the aim of this research was to investigate the effect of an acute PNF stretching on the rate MoreIntroduction: PNF stretching is used to improve maximum muscle function, reduce muscle damage, reduce muscle stiffness and increase joint mobility before exercise. As a result, the aim of this research was to investigate the effect of an acute PNF stretching on the rate of force development of hamstring and quadriceps muscles among athletes with dynamic knee valgus. Methods: The samples of the present study included 12 young female athletes who were selected through available and targeted sampling and all of them had dynamic knee valgus. Subjects performed PNF stretching for the target muscle and then were placed on the force plate for relevant analysis. Their rate of force development was evaluated according to the established protocols. Since the investigation of the acute effect of stretching was desired by the researcher, PNF stretching process was performed for the target muscle before each test. Analysis of variance with repeated measurements was used for statistical analysis of the data by SPSS 24. Results: There is no statistically significant difference in the rate of force development of hamstring muscle after stretching between agonist and antagonist muscles (0.229). Although according to the results of this section, it can be stated that an acute PNF stretching has a significant effect on the rate of force development of hamstring muscle in athletes with dynamic knee valgus (0.017 and 0.016). Conclusion: According to the results of the present research, it can be said that for athletes with dynamic knee valgus, acute PNF stretching can be used to improve the rate of force development of hamstring muscle. Manuscript profile -
Open Access Article
68 - Robust Control of a Quadrotor
Kamal Torabi Alireza Ghafari Kashani -
Open Access Article
69 - Geometric Analysis of the Historical Periods of Architecture in the Mausoleum of Shah Nematollah Valli in Mahan
Maryam Mehrizi Abbas Masoudi Faramarz Hassan pour -
Open Access Article
70 - Design and Implementation of Quadrotor Guidance and Detection System Hardware for Passing Through Window Based on Machine Vision
Sahar Azizi Mohammad Menhaj Mohammad Norouzi -
Open Access Article
71 - Global Path Planning of Quadrotor Using Reinforcement Learning
Mehdi Khakbaz Majid Anjidani -
Open Access Article
72 - A Fuzzy Logic Control System for Quadcopter by Human Voluntary-Physical Movements
Shayan Mesdaghi Mohamad Dosaranian-Moghadam -
Open Access Article
73 - A Honey Bee Algorithm To Solve Quadratic Assignment Problem
mohamad mirzazadeh غلام حسن شیردل behrooz masoumi -
Open Access Article
74 - Presentation and Solving Non-Linear Quad-Level Programming Problem Utilizing a Heuristic Approach Based on Taylor Theorem
Eghbal Hosseini -
Open Access Article
75 - An Efficient Economic-Statistical Design of Simple Linear Profiles Using a Hybrid Approach of Data Envelopment Analysis, Taguchi Loss Function, and MOPSO
Maryam Fazelimoghadam Mohammad Javad Ershadi Seyed Taghi Akhavan Niaki -
Open Access Article
76 - A Novel Model for the Analysis of Interactions Between Governments and Agricultures in a Study of Social Beneficial Externalities Based on the Stackelberg Game: A Case Study on Cotton Production
Mohammad Ali Shafia Sayyede Ashraf Moousavi Loghman Aghdas Badiee Kamran Shahanaghi -
Open Access Article
77 - Evaluation of the four factors affecting the development of a perceived religious identity-building curriculum mediated by individual worldview (Case study: Perspectives of high school teachers in Isfahan)
Mohammadali Salmani Ardani Farhad Shafiepoor Motlagh The aim of this study was to evaluate the factors affecting the development of a perceived religious identity-building curriculum mediated by individual worldview. The statistical universe of present research was consisted of Isfahan city’s all high s More The aim of this study was to evaluate the factors affecting the development of a perceived religious identity-building curriculum mediated by individual worldview. The statistical universe of present research was consisted of Isfahan city’s all high school teachers of Education Department in the academic year of 1392-1393 that number of 340 teachers were selected through the multiphase cluster random sampling method. The present study is applied in terms of purpose and descriptive in terms of method. The data collection tool included 3 researcher-made questionnaires. 1-Effective quadruple values questionnaire (religious, spiritual, moral, human) 2- Personal world view questionnaire in students ‘learning process 3. Questionnaire for developing a perceived religious identity curriculum. To evaluate the reliability Cronbach's alpha was used. Cronbach's alpha of the questionnaires were 0.91 and 0.93 respectively and 0.94 calculated. Factor analysis and construct validity methods were used to evaluate the validity of the questionnaires. Data analysis was performed using SPSS 18 software. The results showed that religious, spiritual and moral values affect the development of perceived religious identity-building curriculum, but the effect of human values on the development of perceived religious identity-building curriculum was not significant. Also, in the fitted corrective model, religious values have a direct effect on the religious identity-building program, both mediated and mediated by an individual worldview. Spiritual and moral values have only a direct effect on the program of perceived religious identity. Human values also indirectly affect the program of religious identity only through the mediation of individual worldview. Manuscript profile -
Open Access Article
78 - Voltage THD Minimization in Multilevel Cascade Inverters Using Repetitive Quadratic Programming
Mehdi Mohammadzamani Majid Moazzami Iman SadeghkhaniThe multilevel cascade inverter is one of the most widely used power-electronics based interfaces in electrical distribution systems. Due to high losses and harmonics, the switching frequency of the inverter should be low in medium and high power applications. For this MoreThe multilevel cascade inverter is one of the most widely used power-electronics based interfaces in electrical distribution systems. Due to high losses and harmonics, the switching frequency of the inverter should be low in medium and high power applications. For this reason, the conventional carrier wave-based sinusoidal pulse modulation (PWM) and space vector PWM that have high switching frequencies cannot be used in these applications. The optimal PWM methods for inverters with step modulation result in lower total harmonic distortion (THD) in output voltage than other common modulation methods. However, one of the major disadvantages of these methods is that the optimal switching angles should be determined using the switching table, limiting the application of the optimal PWM. This paper proposes a method for determination of switching angles by using the iterative quadratic programming method. In each iteration, the proposed method calculates the switching angles by solving the quadratic sub equations with equality constraints and linear equations. Also in the appropriate conditions, global and asymmetric convergences are faster, more accurate, and more efficient, and there is no need for much time and memory for switching angles determination. The optimum switching angles minimize the switching frequency, switching losses, and THD in voltage and current of a three-phase cascade multilevel inverter with step modulation. Also, the power circuit breakers are switched on and off only once in each period. The effectiveness of the proposed method is evaluated through simulation case studies in MATLAB environment. Manuscript profile -
Open Access Article
79 - Optimal Operation of Distribution Electronic Power Transformer Using Linear Quadratic Regulator Method
Mohammad Hosein Rezaei Rahmatolah Hooshmand Mohammad AtaeiTransformers perform many functions such as voltage transformation, isolation and noise decoupling. They are indispensable components in electric power distribution system. However, at low frequencies (50 Hz), they are one of the heaviest and the most expensive equipmen MoreTransformers perform many functions such as voltage transformation, isolation and noise decoupling. They are indispensable components in electric power distribution system. However, at low frequencies (50 Hz), they are one of the heaviest and the most expensive equipment in an electrical distribution system. Nowadays, electronic power transformers are used instead of conventional power transformers that do voltage transformation and power delivery in power system by power electronic converter. In this paper, the structure of distribution electronic power transformer (DEPT) are analized and then paid attention on the design of a linear-quadratic-regulator (LQR) with integral action to improve dynamic performance of DEPT with voltage unbalance, voltage sags, voltage harmonics and voltage flicker. The presentation control strategy is simulated by MATLAB/SIMULINK. In addition, the results that are in terms of dc-link reference voltage, input and output voltages clearly show that a better dynamic performance can be achieved by using the LQR method when compared to other techniques. Manuscript profile -
Open Access Article
80 - Identification and Control of an Implemented Acrobot System
Abbas Harifi Hasan Seidi Amir Zare ShahriThe main goal of this paper is to identify the parameters of an Acrobot system and to design a suitable controller for it. So, the parameters of nonlinear model were identified in four steps using Genetic Algorithm. Then, a new swing-up algorithm was proposed. Also, aft MoreThe main goal of this paper is to identify the parameters of an Acrobot system and to design a suitable controller for it. So, the parameters of nonlinear model were identified in four steps using Genetic Algorithm. Then, a new swing-up algorithm was proposed. Also, after linearization of dynamics, an optimal state feedback controller was designed to balance the Acrobot links. Since, the controller was acted well only near unstable equilibrium point, another state feedback controller was designed by Genetic Algorithm for the farther points. Simulation results show the suitable performance of the proposed methods. Manuscript profile -
Open Access Article
81 - Intelligent Control of Quadrotor Unmanned Helicopter in Hovering Mode
Neda Shamshiri Abbas ChatraeiA Quadrotor helicopter is an unmanned aerial vehicle (UAV). This vehicle has attracted lots of researchers’ attention because of its unique abilities such as being an under-actuated system, vertical take-off and landing, spot movement, more degree of freedom (DOF) MoreA Quadrotor helicopter is an unmanned aerial vehicle (UAV). This vehicle has attracted lots of researchers’ attention because of its unique abilities such as being an under-actuated system, vertical take-off and landing, spot movement, more degree of freedom (DOF) and military and non- military functions. Because of nonlinear and complex dynamic, modeling and controlling this vehicle is one of the most challenging areas in control engineering. In this paper modeling of a Quadrotor will be described using Newton-Euler equations. Stabilizing and controlling of altitude and its attitude are done by three controller including classic PID, Fuzzy- PID and Neural- Fuzzy based on PID. Performances of these controllers are analyzed in the presence of disturbances and mass uncertainties. The main aim of this paper is designing an intelligent PID algorithm which is made by combining fuzzy logic and neural system and it will introduce a Neural- Fuzzy controller which is based on PID. Simulation results are presented by MATLAB software. Manuscript profile -
Open Access Article
82 - Integrating Developed Evolutionary Algorithm and Taguchi Method for Solving Fuzzy Facility’s Layout Problem
Hossein Jafari Abbas Sheykhan -
Open Access Article
83 - یک روش جدید برای حل مساله برنامه ریزی درجه دوم بازه ای
نعمت اله تقی نژاد فاطمه تالشیان مهدی شهینیدر این مقاله یک مسئله برنامه ریزی درجه دوم بازه ای(IQP) مورد بحث قرار می گیرد، جایی که ضریب محدودیت ها و سمت راست قیود با داده های بازه ای نمایش داده شده است. در ابتدا، یک روش معمول برای حل مسئله برنامه نویسی خطی بازه ای مورد بررسی قرار میگیرد سپس این ایده به مساله IQP Moreدر این مقاله یک مسئله برنامه ریزی درجه دوم بازه ای(IQP) مورد بحث قرار می گیرد، جایی که ضریب محدودیت ها و سمت راست قیود با داده های بازه ای نمایش داده شده است. در ابتدا، یک روش معمول برای حل مسئله برنامه نویسی خطی بازه ای مورد بررسی قرار میگیرد سپس این ایده به مساله IQP گسترش می یابد.بر اساس این روش، هر مسئله IQP به دو مسئله برنامه ریزی درجه دوم کلاسیک تجزیه میشود که با استفاده از الگوریتم SQPحل میشود. در انتها نیز نتایج عددی ارائه می شوند. Manuscript profile -
Open Access Article
84 - یک روش برای حل مسائل برنامه ریزی درجه دوم محدب بر پایه معادلات جبری- دیفرانسیلی
معصومه عباسیدر این مقاله، یک مدل بر پایه معادلات جبری دیفرانسیلی برای حل مسائل برنامه ریزی درجه دوم محدب پیشنهاد می گردد. ثابت می شود رهیافت جدید تضمین می نماید که جواب بهینه برای حل این کلاس از مسائل بهینه سازی را تولید نماید. این مقاله همچنین نشان می دهد روش های نقطه درونی سنتی ب Moreدر این مقاله، یک مدل بر پایه معادلات جبری دیفرانسیلی برای حل مسائل برنامه ریزی درجه دوم محدب پیشنهاد می گردد. ثابت می شود رهیافت جدید تضمین می نماید که جواب بهینه برای حل این کلاس از مسائل بهینه سازی را تولید نماید. این مقاله همچنین نشان می دهد روش های نقطه درونی سنتی برای حل مسائل برنامه ریزی درجه دوم محدب می توانند به عنوان حالت ویژه ای از روش های معادلات جبری دیفرانسیلی جدید دیده شوند. نتایج عددی کارایی مدل پیشنهادی را نشان می دهد. Manuscript profile -
Open Access Article
85 - Stability Theorem and Results for Quadrupled Fixed Point of Contractive Type Single Valued Operators
Samuel Aniki Kamilu Rauf -
Open Access Article
86 - جواب تقریبی مدلی از عفونت HIVCD4+T از مرتبه کسری غیر خطی با استفاده از روش تابع پایه شعاعی ربع دیفرانسیلی
کوکب چلمبری حمیده ابراهیمی زینب آیاتیIn this research, differential quadrature radial basis functions Method is performed to a fractional order model of HIV infection of CD4+T. Here, Caputo fractional derivative is used and it is approximated by forward finite difference method. Results have been compared MoreIn this research, differential quadrature radial basis functions Method is performed to a fractional order model of HIV infection of CD4+T. Here, Caputo fractional derivative is used and it is approximated by forward finite difference method. Results have been compared with the results of Laplace Adomian decomposition method (LADM), Laplace Adomian decomposition method-pade (LADM-pade), Runge-Kutta, Variational iteration method (VIM) and Variational iteration method-pade (VIM-Pade) for α_1=α_2=α_3 and residual functions have been plotted. And also approximate solutions of suggested method for different order of fractional derivatives have been shown. Manuscript profile -
Open Access Article
87 - Stability and Iterative Procedures for Quadrupled Fixed Point in Partially Ordered Metric Spaces
Samuel Aniki -
Open Access Article
88 - The Precision Approach of the Lactation Curve in Sirohi Goats Using Non-Linear Models
L. Gautam H. Ashraf Waiz -
Open Access Article
89 - همخونی و اثرات آن روی وزن بدن، نسبت کلیبر، ابعاد بدن، وزن بیده و صفات تولیدمثلی در گوسفند نژاد ماکویی
ش. جعفریمبنا و اساس این مطالعه مروری در نظر گرفتن نقشی است که عوامل حیوانی (تولید شیر بالقوه، وزن بدن، امتیاز شرایط بدنی، وضعیت شیردهی، شکم زایش و باروری) در عملکرد تولید شیر (با در نظر گرفتن توازن انرژی و عملکرد شکمبه در طی منحنی کامل شیردهی حیوانات) و کیفیت شیر (محتوای پروتئی Moreمبنا و اساس این مطالعه مروری در نظر گرفتن نقشی است که عوامل حیوانی (تولید شیر بالقوه، وزن بدن، امتیاز شرایط بدنی، وضعیت شیردهی، شکم زایش و باروری) در عملکرد تولید شیر (با در نظر گرفتن توازن انرژی و عملکرد شکمبه در طی منحنی کامل شیردهی حیوانات) و کیفیت شیر (محتوای پروتئین شیر، محتوای چربی شیر، محتوای لاکتوز شیر، ویتامین­ها، مواد معدنی، ایمنوگلوبولینها، سلول­های شیر، باکتری­های بیماریزا و بازدارنده­ها) گاوهای شیری در حال چرا (با در نظر گرفتن نرخ جایگزینی و پاسخ تولید شیر در مرتع حیوانات در شرایط مصرف برنامه­های مکمل­سازی مختلف) ایفا می­کنند. تمامی این عوامل، در جهت دستیابی به تولید شیر بالا در حیوانات، به مدیریت مرتع به عنوان عوامل کلیدی بقای سیستم­های شیری چرا و به منظور حفظ مصرف ماده خشک مرتعی بالا در چمنزارهای با کیفیت علوفه گرامینه بالا (سطوح بالای پروتئین خام، کربوهیدراتهای محلول در آب و قابلیت هضم ماده آلی در مرتع ولی دارای سطوح پایین الیاف نامحلول در محلول پاک کننده اسیدی و خنثی) توجه دارند، که در تمامی طول فصل چرا نیازهای گاو را در تمامی زمان­ها و در طی طول دوره شیردهی برآورده نماید. همچنین ضروری است تا استفاده از مکمل­سازی مرتع (به طور طبیعی در نقطه اوج دوره شیردهی، زمانی که گاوها به طور کلی در وضعیت توازن منفی انرژی هستند و فراهم نمودن مواد سیلو شده یا کنسانتره میتواند به بهبود این شرایط کمک کند) بتواند سطح تولید شیر را در حد مطلوب حفظ نماید. به موجب این امر، باید به دنبال دستیابی به نرخ تبدیل بهینه علوفه گرامینه به شیر به صورت رقابتی و سودآور بود. برای نیل به این هدف سیستم­های تولید شیر مبتنی بر مرتع در بیشتر مناطق معتدله در سرتاسر جهان ایجاد شده است که تأکید آنها بر افزایش قیمت شیر و افزایش درآمد دامداران در نواحی مرطوبی نظیر گالیسیا (در شمال غربی اسپانیا) است. در این صورت بهبود کمیت و کیفیت شیر تولیدی به صنایع شیری انتقال می­یابد. Manuscript profile -
Open Access Article
90 - Chaotic Time Series Prediction Using Optimal Fuzzy Systems Based on Sequential Quadratic Programming-Case Study: Gold Price
Rasoul Rajaei Ali Akbar Gharaveisi Seyed Mohammad Ali Mohammadi -
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91 - Effective heuristics and meta-heuristics for the quadratic assignment problem with tuned parameters and analytical comparisons
Mahdi Bashiri Hossein Karimi -
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92 - Constrained consumable resource allocation in alternative stochastic networks via multi-objective decision making
Seyed Saeid Hashemin Seyed Mohammad Taghi Fatemi Ghomi -
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93 - An iterative method for tri-level quadratic fractional programming problems using fuzzy goal programming approach
Semu Mitiku Kassa Teklay Hailay Tsegay -
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94 - A hybrid method to find cumulative distribution function of completion time of GERT networks
S.S Hashemin S.M.T Fatemi Ghomi -
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95 - Security Issues in the Indo-Pacific Region: India’s Strategic ‘Plurilateral’ Engagement
Peu Ghosh Akshat Mehta -
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96 - Aspects of Heavenly Bodies in the poetry of Nezāmi Ganjavi (Conjunction, Opposition, Quadrate, Trine and sextile)
مظاهر نیکواه Based on old beliefs, astrology reading is a means of divination that studies the position and aspects of heavenly bodies with a view to predicting their influences on human affairs. It correlates celestial cycles and positions with terrestrial events and experi More Based on old beliefs, astrology reading is a means of divination that studies the position and aspects of heavenly bodies with a view to predicting their influences on human affairs. It correlates celestial cycles and positions with terrestrial events and experiences. The Iranian poet, Nezāmi Ganjavi, by using astrology, illustrates “aspects of heavenly bodies”. The present paper studies his poems about conjunction, opposition, quadrate, trine and sextile. Manuscript profile -
Open Access Article
97 - Study of pH Changes of Culture Medium of Green Microalgae (Scenedesmus quadricauda) under Chemical Stresses
A. piraliBiological, chemical and physical factors influence on physiology of aquatic microalgae. Changes in these factors effect and disturb the life cycle of microalgae as well as their physiological parameters.In this study the changes of pH in the culture medium of green alg MoreBiological, chemical and physical factors influence on physiology of aquatic microalgae. Changes in these factors effect and disturb the life cycle of microalgae as well as their physiological parameters.In this study the changes of pH in the culture medium of green algae Scenedesmus quadricauda (Turp.)Bréb. In three different culture media under chemical stresses using herbicideMetribuzin and water hardness, was investigated. The experiment was conducted in a completely randomized design for a period of 21 days. Change in acidityof culture media A and B had direct relationship with water hardness and presence of herbicide. Results of pH changes in medium A suggest a direct correlation with the amount of chlorophyll a, b and carotenoid. According to the results of analysis of variance, there are also significant differences (P < 0.05) in some treatments in different media. The greatest amount of carotenoid was observed at 150 mg/L CaCO3. In general, it can be said that the green algae, Scenedesmus quadricauda species, had high tolerance to changes in the acidity of the medium, along with chemical stresses caused by water hardness and presence of herbicide Metribuzin. Manuscript profile -
Open Access Article
98 - تأثیر پارامترهای پایه الاستیک وینکلر-پاسترناک در تحلیل تنش صفحات مستطیل شکل که تحت بار متحرک قرار دارند
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99 - تجزیه و تحلیل ارتعاش اجباری صفحات مستطیلی دارای درجه بندی عملکردی با تخلخل تحت بار متحرک
احمدرضا خورشیدوند علی خیری -
Open Access Article
100 - ارتعاشات صفحه ترک خورده با استفاده از روش quadrature دیفرانسیل و تجزیه و تحلیل مد تجربی
س. مرادی پ. علیموری -
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101 - A High Order Sliding Mode Controller Design for the Quadruple Tank Process with a Time Delay Compensator in The Presence of Uncertainties
Davood Ansari Mehdi Siahi Mohammad Komareji -
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102 - The Parameters Estimation of European Option pricing model under Underlying Asset with Stochastic Volatility by Loss Function Method
Abdolsadeh Neisy Behrouz Maleki Roozbe RezaeianCalculating the option price in Stochastic Volatility models is one of the most important queries in financial mathematics that several investigations published about it in recent decades. But in most of these investigations, Model Parameters are used in calculating opt MoreCalculating the option price in Stochastic Volatility models is one of the most important queries in financial mathematics that several investigations published about it in recent decades. But in most of these investigations, Model Parameters are used in calculating options without calibration and referring to the process of doing this. In this Article, besides introducing and studying Double Heston Model, we want to estimate the parameters of this model with the help of Loss Function. For this, we use Microsoft Corporation put options with similar maturities and different strike prices, and with estimating Implied Volatility of put option price of this company in April 2015, we achieved this matter. Manuscript profile -
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103 - Asymptotic aspect of quadratic functional equations and super stability of higher derivations in multi-fuzzy normed spaces
M. khanehgir F. Hasanvand -
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104 - System of AQC functional equations in non-Archimedean normed spaces
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105 - On some curvature functionals over homogeneous Siklos space-times
A. Zaeim M. Jafari R. Kafimoosavi -
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106 - The extension of quadrupled fixed point results in K-metric spaces
G. Soleimani Rad -
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107 - A mathematically simple method based on denition for computing eigenvalues, generalized eigenvalues and quadratic eigenvalues of matrices
M. Nili Ahmadabadi -
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108 - A note on unique solvability of the absolute value equation
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109 - Using Chebyshev polynomial’s zeros as point grid for numerical solution of nonlinear PDEs by differential quadrature- based radial basis functions
Majid Erfanian Sajad Kosari -
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110 - Relativistic Stellar Models with Quadratic Equation of State
Manuel Malaver Hamed Daei Kasmaei -
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111 - ANALYSIS OF DISCRETE-TIME MACHINE REPAIR PROBLEM WITH TWO REMOVABLE SERVERS UNDER TRIADIC POLICY
Veena Goswami P. Vijaya Laxmi -
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112 - THE REVIEW OF ALMOST PERIODIC SOLUTIONS TO A STOCHASTIC DIERENTIAL EQUATION
Siavosh Ahmadi -
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113 - ON THE ALMOSTLY SURE CONVERGENCE OF THE SEQUENCE D_P,Q
Hamid Reza Moradi Einolah Deiri -
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114 - A SIMPLIFIED LAGRANGIAN MULTIPLIER APPROACH FOR FIXED HEAD SHORT-TERM HYDROTHERMAL SCHEDULING
S. Kavitha Nirmala P.Ratchagar -
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115 - بهینه سازی بوردهای الکترونیکی مجهز به دو بسته BGA برای بهبود پاسخ در ارتعاشات تصادفی
میلاد شهسواری مسعود عسگریطیف وسیعی از قطعات در طول دوره عمر خود، در بیشتر مواقع تحت بارگذاری دینامیکی و کمتر تحت بارهای استاتیکی قرار میگیرند. مهمترین بارگذاری دینامیکی در دوره عمر قطعات، ارتعاشات تصادفی میباشد. برای ارزیابی چرخه عمر قطعات، معمولاً تحلیل خستگی انجام شده و مقاومت قطعات در محیط Moreطیف وسیعی از قطعات در طول دوره عمر خود، در بیشتر مواقع تحت بارگذاری دینامیکی و کمتر تحت بارهای استاتیکی قرار میگیرند. مهمترین بارگذاری دینامیکی در دوره عمر قطعات، ارتعاشات تصادفی میباشد. برای ارزیابی چرخه عمر قطعات، معمولاً تحلیل خستگی انجام شده و مقاومت قطعات در محیط کاری، مورد ارزیابی قرار میگیرد. خارج از محدوده قرار گرفتن فرکانس طبیعی قطعات، نسبت به حوزه فرکانسی ارتعاش تصادفی، موجب شده تا از پدیده تشدید فاصله گرفته که این امر موجب بالا بردن عمر کاری آن میشود. در این تحقیق یک بورد مدار چاپی که دارای دو قطعه الکترونیکی BGA است، مورد مطالعه قرار گرفته و توسط روشهای خاص بهینه سازی، مقدار فرکانس طبیعی آن بررسی و بهینه شده است. بهینه سازی با دو الگوریتم مختلف انجام شده و پاسخ های بدست آمده از هر الگوریتم، مقایسه و صحه-گذاری شده است. ضمناً برای بدست آوردن پاسخ در هر طیف ارتعاش، از نرم افزار آباکوس استفاده شده است. Manuscript profile -
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116 - Dynamic Modeling, Assembly and implementing Quadrotor UAV Using PID Controller
Mahyar Geibollahi Ata Jahangir Moshayedi -
Open Access Article
117 - تحلیل ارتعاشات آزاد تیر تیموشنکو تقویتشده با نانولولههای نیتریدبور بر روی بستر ارتجاعی
ایلدا عبداللهی محمدحسین یاسدر این مقاله به بررسی ارتعاشات آزاد تیر نانوکامپوزیتی پایه پلیمری تقویت شده با نانولولههای نیترید بور بر روی بستر الاستیک پرداخته شده است. نانولولهها صاف، بدون نقص و با جهت گیری یکنواخت و مستقیم در ماتریس در نظر گرفته شده است. نحوهی توزیع نانولوله­ها در راس Moreدر این مقاله به بررسی ارتعاشات آزاد تیر نانوکامپوزیتی پایه پلیمری تقویت شده با نانولولههای نیترید بور بر روی بستر الاستیک پرداخته شده است. نانولولهها صاف، بدون نقص و با جهت گیری یکنواخت و مستقیم در ماتریس در نظر گرفته شده است. نحوهی توزیع نانولوله­ها در راستای ضخامت تیر به صورت یک توزیع یکنواخت و سه توزیع هدفمند متفاوت در نظر گرفته شده است. خواص تیر نانوکامپوزیتی با استفاده از یک مدل میکرومکانیکی بدست آمده و معادلات حاکم بر اساس تئوری تیر تیموشنکو و با استفاده از اصل همیلتون استخراج شده است. معادلات حاکم با استفاده از روش دیفرانسیل کوادریچر تعمیم یافته حل شده و فرکانسهای طبیعی تیر بدست آمده است. در ادامه تاثیر پارامترهای مختلف از قبیل کسر حجمی نانولوله، نحوهی توزیع نانولوله در راستای ضخامت تیر، نوع بستر الاستیک، شرایط مرزی مختلف و نسبت لاغری تیر بر روی فرکانس طبیعی بررسی شده است. نتایج بدست آمده نشان میدهد که تغییر هر کدام از این پارامترها تاثیر بسزایی بر روی فرکانس طبیعی دارد. Manuscript profile -
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118 - کمانش خطی وغیرخطی صفحات دایروی/حلقوی گرافن ارتوتروپیک به کمک ﺗﺌﻮری اﻻﺳﺘﯿﺴﯿﺘﻪ ﻏﯿﺮﻣﻮﺿﻌﯽ
مصطفی صادقیان مهرداد جبارزادهدر این مقاله، تحلیل خطی و غیرخطی کمانش صفحات نسبتا ضخیم دایروی/حلقوی گرافن با خواص ارتوتروپیک بر پایه الاستیک تحت بار مکانیکی مورد بررسی قرار می­گیرد. به کمک ﺗﺌﻮری اﻻﺳﺘﯿﺴﯿﺘﻪ ﻏﯿﺮﻣﻮﺿﻌﯽ، اصل کار مجازی، تئوری مرتبه اول برشی و کرنش­های غیرخطی فون-کارمن، روابط حاکم بر Moreدر این مقاله، تحلیل خطی و غیرخطی کمانش صفحات نسبتا ضخیم دایروی/حلقوی گرافن با خواص ارتوتروپیک بر پایه الاستیک تحت بار مکانیکی مورد بررسی قرار می­گیرد. به کمک ﺗﺌﻮری اﻻﺳﺘﯿﺴﯿﺘﻪ ﻏﯿﺮﻣﻮﺿﻌﯽ، اصل کار مجازی، تئوری مرتبه اول برشی و کرنش­های غیرخطی فون-کارمن، روابط حاکم برحسب جابجایی–ها بدست آمده و از روش مربعات دیفرانسیلی (DQ) همراه با توزیع غیریکنواخت نقاط (چیبشف-گوس-لوباتو) استفاده شده است. برای اعتبار سنجی، نتایج بدست آمده با نتایج کمانش در مراجعدیگر مقایسه شده و اثرات ضریب غیرموضعی، ضخامت، شعاع و پایه الاستیک، بر بارهای بی بعد کمانش مورد بررسی قرار گرفته است و همچنین نتایج تحلیل به روش تئوری غیر موضعی و موضعی با یکدیگر مقایسه شده اند. از نتایج مشاهده می­شود که بار بی­بعد کمانش صفحات گرافن با کاهش انعطاف پذیری از نظر شرط مرزی، با افزایش ضریب غیرموضعی، افزایش بیشتری می­یابد و همچنین با افزایش شعاع صفحه، اختلاف نتایج تحلیل غیر موضعی و موضعی بیشتر می­شود. Manuscript profile -
Open Access Article
119 - تحلیل کمانش ورق مستطیلی ارتوتروپیک و غیر ایزوتروپیک به روش مربعات دیفرانسیلی تعمیم یافته ( GDQM )
محسن فتاحی فاطمه فرهت نیا منصور درویزهدر این مقاله، کمانش ورقهای مستطیلی ارتوتروپیک و غیر ایزوتروپیک تحت توزیع مختلفی از بارگذاریهای فشاری محوری مورد بررسی قرار گرفته است. بدین منظور ابتدا معادلات حاکم بر کمانش ورق ایزوتروپیک اعمال و سپس با استفاده از روابط مربوط به رفتار مکانیکی مواد مرکب، معادلات حاکم ک Moreدر این مقاله، کمانش ورقهای مستطیلی ارتوتروپیک و غیر ایزوتروپیک تحت توزیع مختلفی از بارگذاریهای فشاری محوری مورد بررسی قرار گرفته است. بدین منظور ابتدا معادلات حاکم بر کمانش ورق ایزوتروپیک اعمال و سپس با استفاده از روابط مربوط به رفتار مکانیکی مواد مرکب، معادلات حاکم کمانش بر ورق غیر ایزوتروپیک به دست آورده میشود. با اعمال روش مربعات دیفرانسیلی تعمیم یافته (GDQM) بر معادلات کمانش تحت شرایط مرزی مورد نظر، یک مجموعه معادلات مقدار ویژه حاصل گردیده که به منظور بدست آوردن ضریب نیروی کمانشی یک برنامه کامپیوتری در نرم افزارMATLAB به نحوی که تأثیر پارامترهایی مانند جنس ورق کامپوزیتی، نسبت طول به عرض ورق، تعداد لایهها، زاویه چیدن لایهها، نوع بارگذاری و شرایط مرزی به صورت تکیه گاه گیردار و ساده در آن لحاظ شده باشد، نوشته شده است. در این تحقیق بارگذاری های متفاوت یکنواخت تک محوری و دو محوری، خطی و سهمی شکل متغیر در راستای طولی و عرضی ورق اعمال شده است. همچنین مقایسه رفتارکمانش برای ورق ارتوتروپیک و غیر ایزوتروپیک نیز صورت گرفته است. نتایج حاصل از روش مربعات دیفرانسیلی تعمیم یافته (GDQM) با نتایج گزارش شده از حل رایلی- ریتز و حل اجزای محدود به کمک نرم افزار ANSYS 8.0 مقایسه و تایید شده است. Manuscript profile -
Open Access Article
120 - Nonlocal Mechanical Buckling Analysis of Nano Single Layer Sheets Using Differential Quadrature method
M. Sadeghian M. Jabbarzadeh -
Open Access Article
121 - بررسی تجربی و شبیهسازی فرآیند شکلدهی غلتکی سرد لوله به روش تحلیل اجزای محدود
حسن مسلمی نائینی مهدی تاجداری سیامک مزدک ولی اله پناهی زادهفرآیند شکلدهی غلتکی سرد یکی از روشهای شکلدهی فلزات است و روشی متداول برای تولید لوله از ورق تخت میباشد. در این مقاله تغییر شکل الاستیک-پلاستیک یک ورق فلزی طی فرآیند شکلدهی غلتکی سرد و تبدیل آن به لوله توسط نرمافزار روش اجزای محدود انسیس[1]، بررسی شده است. در این ش Moreفرآیند شکلدهی غلتکی سرد یکی از روشهای شکلدهی فلزات است و روشی متداول برای تولید لوله از ورق تخت میباشد. در این مقاله تغییر شکل الاستیک-پلاستیک یک ورق فلزی طی فرآیند شکلدهی غلتکی سرد و تبدیل آن به لوله توسط نرمافزار روش اجزای محدود انسیس[1]، بررسی شده است. در این شبیهسازی مراحل فشاری شدید، مرحله راهنما و مرحله پرهای مورد بررسی قرار گرفته است. در بخش عملی با استفاده از اطلاعات خطوط لوله 24 اینچ کارخانه لولهسازی اهواز مدلی جداگانه طراحی گردیده است. نتایج حاصل از شبیهسازی با آنچه از مطالعات تجربی و تحلیلی دیگر پژوهشگران و با نتایج تجربی شرکت لولهسازی اهواز به دست آمده است؛ مقایسه گردیده و همخوانی خوبی بین آنها دیده میشود. [1]-Ansys Manuscript profile -
Open Access Article
122 - استفاده از روش بهبود یافته انتگرال دیفرانسیلی برای تحلیل ارتعاشات صفحه ارتوتروپیک قطاعی روی بستر الاستیک
مسلم محمدی مصطفی غیور علی فرج پوردر مقاله حاضر از روش بهبود یافته انتگرال دیفرانسیلی برای تحلیل ارتعاشات آزاد یک صفحه­ قطاعی شکل با رفتار ارتوتروپیک قطبی بر روی بستر الاستیک دو پارامتری استفاده شده است. جزئیات و فرمول بندی این روش عددی ارائه شده و با استفاده از آن مقادیر دقیقی از فرکانسهای طبیعی ب Moreدر مقاله حاضر از روش بهبود یافته انتگرال دیفرانسیلی برای تحلیل ارتعاشات آزاد یک صفحه­ قطاعی شکل با رفتار ارتوتروپیک قطبی بر روی بستر الاستیک دو پارامتری استفاده شده است. جزئیات و فرمول بندی این روش عددی ارائه شده و با استفاده از آن مقادیر دقیقی از فرکانسهای طبیعی برای محدوده وسیعی از دو پارامتر بستر الاستیک با هم مقایسه شده است. از مزیتهای روش بهبود یافته انتگرال دیفرانسیلی میتوان به عدم استفاده از روش دلتا و سادگی اعمال شرایط مرزی اشاره کرد. همچنین این روش عددی هیچ گونه محدودیتی در مقدار زاویه رأس قطاع و یا نوع شرایط مرزی ندارد. این در حالی است که اکثر روش­های عددی در این دو مورد دارای محدودیتاند. فرکانسهای طبیعی یک ورق قطاعی شکل با خواص ارتوتروپیک قطبی بر روی بستر الاستیک دو پارامتری برای اولین بار با استفاده از روش بهبود یافته انتگرال دیفرانسیلی در این بررسی بهدست آمده است. Manuscript profile -
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123 - بررسی ارتعاش تیر ضخیم تابعی مدرج تحت نیروی محوری براساس تئوری دو بعدی الاستیسیته و روش مربعات تفاضلی تعمیم یافته
حسین فراهانی فرزان براتی محمد نجاتی حمید باتمانیدر این مقاله ارتعاش تیر یکسرگیردار از جنس تابعی مدرج، تحت تاثیر بار محوری ثابت مورد بررسی قرار گرفته است. تیر دارای سطح مقطع یکنواخت است و خواص تیر در راستای ضخامت تیر به صورت تابعی و پیوسته تغییر می­کند. معادلات پایداری و معادلات حرکت از اصل همیلتون و بر اساس تئور Moreدر این مقاله ارتعاش تیر یکسرگیردار از جنس تابعی مدرج، تحت تاثیر بار محوری ثابت مورد بررسی قرار گرفته است. تیر دارای سطح مقطع یکنواخت است و خواص تیر در راستای ضخامت تیر به صورت تابعی و پیوسته تغییر می­کند. معادلات پایداری و معادلات حرکت از اصل همیلتون و بر اساس تئوری دو بعدی الاستیسیته، بر حسب مولفه­های جابجایی به دست آمده اند. حل معادلات دیفرانسیل کوپل پایداری و حرکت با استفاده از روش مربعات تفاضلی تعمیم یافته صورت گرفته است. در این مقاله تاثیر پارامترهای مختلف مانند نسبت ضخامت به طول، بار محوری اعمال شده و همچنین توان کسر حجمی مختلف، بر روی بسامد­های طبیعی تیر مورد بررسی قرار گرفت. همچنین برای بررسی همخوانی معادلات و همچنین روش حل به کار گرفته شده، مقایسه­ای بین کار حاضر با مقالات معتبر و همچنین نرم افزار تحلیلی ABAQUS انجام شد. نتایج نشان می­دهد روش عددی مربعات تفاضلی تعمیم یافته به کار گرفته شده در این مقاله دارای دقت خوبی می باشد. براساس نتایج، با افزایش توان کسر حجمی الیاف در تیر تابعی مدرج تحت بار محوری بسامد طبیعی تیر افزایش پیدا کرده و به ازای توان کسر حجمی بالا تغییرات زیادی در بسامد طبیعی مشاهده نمی­شود. همچنین با افزایش نسبت ضخامت به طول در محدوده بررسی شده تیر هدفمند، بسماد طبیعی بی بعد تیر بدون بار بحرانی، کاهش پیدا می­کند. اعمال بار محوری تا محدوده ی بار بحرانی، بسامد های طبیعی تیر تابعی مدرج را تحت تاثیر قرار داده و باعث کاهش آن می گردد. Manuscript profile -
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124 - شبیه سازی و کنترل ارتعاشات چرخشی تیرک سمپاش با یک مدل سیستم تعلیق جدید
رضا ابراهیمی مصطفی غیورسمپاش­ها وسایل مهمی در کشاورزی هستند که معمولاً به وسیله تراکتور در مزرعه حرکت داده می­شوند. سمپاش­ها باید در شرایط مختلفی که در مزرعه با آن مواجه می­شوند، نرخ ثابتی از مواد شیمیایی را توزیع کنند. ارتعاشات ناخواسته تیرک سمپاش، باعث کاهش عمر آن و توزیع غی Moreسمپاش­ها وسایل مهمی در کشاورزی هستند که معمولاً به وسیله تراکتور در مزرعه حرکت داده می­شوند. سمپاش­ها باید در شرایط مختلفی که در مزرعه با آن مواجه می­شوند، نرخ ثابتی از مواد شیمیایی را توزیع کنند. ارتعاشات ناخواسته تیرک سمپاش، باعث کاهش عمر آن و توزیع غیر یکنواخت مواد شیمیایی پاشیده شده در زمین می­شود. بنابراین در این مطالعه، یک مدل سیستم تعلیق برای ارتعاشات چرخشی تیرک سمپاش با استفاده از المان­های فنر و میراگر افقی و قائم ارائه شده است. سپس فضای حالت سیستم دینامیکی استخراج شده است. در این فضای حالت، چرخش مطلق قاب متصل شده به تراکتور حول محور افقی (غلت طولی تراکتور) ورودی است و چرخش مطلق تیرک سمپاش حول محور افقی خروجی است. همچنین ماتریس بهره بهینه برای فضای حالت سیستم، با استفاده از تنظیم کننده خطی مرتبه دوم (LQR) طراحی گردیده است. نهایتاً پاسخ تیرک سمپاش به ورودی­های ضربه، پله، شیب و نویز سفید محاسبه و با پاسخ ضربه، پله، شیب و نویز سفید سیستم بدون کنترلر مقایسه شده است. نتایج نشان می­دهد که کنترلر طراحی شده به طور قابل ملاحظه­ای ارتعاشات چرخشی تیرک سمپاش را کاهش داده و عملکرد سمپاش را بهبود می­بخشد. Manuscript profile