-
Open Access Article
1 - Magnetized electron-positron plasma, new mode, stability conditions
Farshid Nooralishahi Mohammad Salem Mohammad Reza Tanhayi -
Open Access Article
2 - Electron spin orientation dependence on momentum in pseudo gap phase of Bi2212
Udai Tyagi Partha Goswami -
Open Access Article
3 - Gradient effects on dust lattice waves in paramagnetic dusty plasma crystals
Mehran Shahmansouri -
Open Access Article
4 - Double critical coupled ring resonator-based add–drop filters
Mahdi Bahadoran Iraj Sadegh Amiri -
Open Access Article
5 - 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
6 - FT-IR and NMR Spectroscopic Investigation and Hybrid Computational DFT/HF Analysis on the Molecular Structure of NSPD
Mohammad Mahdi Akbarzadeh Khirollah Mehrani Shahriar Ghammamy Vahideh Hadigheh Rezvan -
Open Access Article
7 - Theoretical study of - stacking interactions in substituted-coronene||cyclooctatetraene complexes: A system without direct electrostatic effects of substituents
Pouya Karimi -
Open Access Article
8 - Synthesis of Some Nitrogen Functional Derivatives of 5-substituted-6-azauracil as Biologically Active Compounds
Hassan Kabirifard Zeinab Alimardani Natasha Ataeimehr Gisa Rezai -
Open Access Article
9 - Synthesis of Nitrogen Functional Derivatives of 5-substituted-6-azauracil as one of the Four Nucleobases in the Nucleic Acid of RNA
L. Torkian E. Amereh N. Mohammadi -
Open Access Article
10 - An Overview of Printed Microstrip Antennas in Eyewear Applications
Mahdi JalaliThis article reviews some of the smart antennas used in Eyewear, which can receive frequencies of 700-960 MHz and 2.7-1.7 GHz, as well as Wi-Fi 5G (5.18-5.85 GHz) and Wi-Fi 6e (5.925 -7.125 GHz) to be used in wireless Eyewear glasses. Since the antennas of Eyewear devic MoreThis article reviews some of the smart antennas used in Eyewear, which can receive frequencies of 700-960 MHz and 2.7-1.7 GHz, as well as Wi-Fi 5G (5.18-5.85 GHz) and Wi-Fi 6e (5.925 -7.125 GHz) to be used in wireless Eyewear glasses. Since the antennas of Eyewear devices that work in 4G, 5G cellular communication standard and Wi-Fi 6 internal wireless communication is a new category, first a general study for antenna bandwidth in different locations is done. Given that, these antennas are designed as mutual elements (coupled) and are mostly placed on FR4 or polycarbonate substrate. Then the MIMO antennas used in these glasses are investigated and gain, efficiency and SAR studies are performed along with different modes. In order to obtain a good adaptation to the use cases, the human head is always considered in the simulations. After that, antenna designs with suitable dielectric cover and frame are suggested. Manuscript profile -
Open Access Article
11 - Investigation of Jahn-Teller Effect in Distortion of OX2 (X=Cl. Br. I) Molecular System
Reza Fazaeli Ali Esmaeili esmat MohammadinasabPseudo Jan-Teller effect is discussed as the one of the most factors in structural instability in OX2(X=Cl,Br,I) molecules. ِ Distortion from linear geometry is known as Pseudo-Jahn-Teller effect. This effect convert the high-symmetry structure to the low-symmetry. Effe MorePseudo Jan-Teller effect is discussed as the one of the most factors in structural instability in OX2(X=Cl,Br,I) molecules. ِ Distortion from linear geometry is known as Pseudo-Jahn-Teller effect. This effect convert the high-symmetry structure to the low-symmetry. Effective parameters in vibrational constant between [HOMO(-1) Πu to LUMO(Ʃg)] is investigated in linear geometry (D∞h) calculations in LC-wPBE/Def2-TZVPP، B3LYP/Def2-TZVPP and MP2/Def2-TZVPP level of theory generates structural parameters , corrected electronic energy, electronegativity and hardness.Mutual effect of [Lp(3)X to σ*(1)O-X] gives Stability Energy (E(2) ),vibrational coupling costant(Fij) and energy gap between above mentiond orbitals (Δ) .The interactions and effectiveness of these parameters with the structural parameters of the desired compounds were the focus of the study. Manuscript profile -
Open Access Article
12 - A Review of the Jahn-Teller Effects (Jahn -Teller, Renner-Teller, and Pseudo Jahn -Teller): The main origin of instability and symmetry breaking of molecular systems
Ghazaleh KouchakzadehThe study of the origin of equilibrium geometry of systems has a long history. Any system wants to stay in a stable state; therefore, the systems are converted from the configuration of high symmetry to the configuration of low symmetry. The origin of systems instabilit MoreThe study of the origin of equilibrium geometry of systems has a long history. Any system wants to stay in a stable state; therefore, the systems are converted from the configuration of high symmetry to the configuration of low symmetry. The origin of systems instability is due to the Jahn-Teller effect. In fact, the Jahn-Teller effect consists of the Jahn -Teller, the Renner-Teller, and the pseudo Jahn –Teller properties. The Jahn- Teller effect is an important mechanism of symmetry breaking in molecular and solid- state systems. The vibronic coupling between the ground state and excited states along the nuclear displacements is assumed as a perturbation, which changes the configuration of systems from a planar geometry with a high symmetry to the bending equilibrium geometry with a lower symmetry. The bending has a significant effect on the prediction of spectroscopic and molecular properties of the systems, as electrical, magnetic, conductivity properties and some other properties can change. Manuscript profile -
Open Access Article
13 - ANew Soft Switching Two Input Converter for Hybrid Green Energy Systems
Ahmed Abdulkadhim Issa mohammad hosein ershadiIn this paper, a new two-input converter with zero voltage switching for green energy hybrid systems is presented. In the proposed converter, a new auxiliary circuit is used to create zero voltage switching with the least number of auxiliary elements. The auxiliary circ MoreIn this paper, a new two-input converter with zero voltage switching for green energy hybrid systems is presented. In the proposed converter, a new auxiliary circuit is used to create zero voltage switching with the least number of auxiliary elements. The auxiliary circuit not only provides zero voltageswitching conditions, but also absorbs the energy of the leakage inductance and prevents voltage spikesacross the main switches. On the other hand, the use of coupled-inductors also increases the gain of the converter and greatly reduces the voltage stress on the switches. The proposed converter has been designed with a 120 watts power and simulated in PSICE software, and also a prototype has been made to prove the theoretical analysis of the circuit. Manuscript profile -
Open Access Article
14 - The Charging Circuit of the Energy Storage System of the Multi-Input Converter with High Gain (Design, Simulation and Laboratory Investigation)
Donya Taheri Ghazanfar Shahgholian Mohammad Mehdi MirtalaeiIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by co MoreIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by combining them, it is possible to use switches with low voltage stress and as a result, low conductivity. The charging performance of the energy storage system is explained and the structure and performance of the proposed converter are investigated for the design of a non-isolated multi-input converter with high voltage gain. The precise design method for the correct operation of the converter is presented and the simulation results of the converter performance are shown. Finally, in order to verify the accuracy of the results obtained from the simulation of the proposed converter, a laboratory sample has been made and a comparison has been made between the results. Manuscript profile -
Open Access Article
15 - Stiffeners Mechanical Effect Analysis by Numerical Coupling
R Naceur Bouharkat A Sahli S Sahli -
Open Access Article
16 - FEM Implementation of the Coupled Elastoplastic/Damage Model: Failure Prediction of Fiber Reinforced Polymers (FRPs) Composites
I UD DIN P Hao M Aamir G Franz S Panier -
Open Access Article
17 - An Algorithm for Modeling and Interpretation of Seismoelectric Data
Ehsan Golmakani Torghabeh Mohammad Ebrahimi Dabbagh Hooman LatifiGenerally speaking, seismoelectric modeling is a prospecting method based on seismic and electromagnetic waves, in which waves generated by a seismic source at the boundary of the two environments generate a relative fluid-solid motion formed as a result of antagonism b MoreGenerally speaking, seismoelectric modeling is a prospecting method based on seismic and electromagnetic waves, in which waves generated by a seismic source at the boundary of the two environments generate a relative fluid-solid motion formed as a result of antagonism between the elastic properties of the environment with the saturated fluid. This research has as its objective, a study of the effect of an electric field due to DC current on the propagation of seismic waves by pseudo spectral time domain method, or the more general concept of seismoelectric coupling effect. In this research, poroelastic equations were used for seismic waves and Maxwell’s equations for lectromagnetic waves. Additionally, the seismoelectric effect or charge density, electrical conductivity, dielectric permittivity function, fluid viscosity and zeta potential were determined. DC electric field variations were compared with results of a physical experiment conducted in a modeled environment. The results revealed that DC electric significantly affected the propagation of elastic energy through seismoelectric coupling in a wide range of seismic frequency widths. Additionally, the boundaries of the substrata were specified using the horizontal component of the electric field of the magnetic wave Manuscript profile -
Open Access Article
18 - Synthesis and spectroscopic study of a new diamidophosphoester, (4-CH3-C6H4O)((CH3)2CHNH)2P(O)
Fahimeh Sabbaghi Mehrdad Pourayoubi -
Open Access Article
19 - Polyethylene glycol embedded tribromide as an efficient and reusable catalyst for the library synthesis of nitrogen containing heterocycles
Sanny Verma -
Open Access Article
20 - Synthesis and characterization of molybdenum chelate-bonded supported on magnetic nanoparticle as an efficient and recyclable catalyst system for C–N cross coupling of amides
Maryam Gorjizadeh Mozhgan Afshari -
Open Access Article
21 - Gait Generation for a Bipedal System By Morris-Lecar Central Pattern Generator
sahar Farshbaf Rashidi Mohammad-Reza Sayyed Noorani Maryam Shoaran Ahmad Ghanbari -
Open Access Article
22 - The optimum configuration of FRP laminates of coupling shear wall concerning the load capacity
Hamoon Abroon Shahrbijary Ali Delnavaz -
Open Access Article
23 - The effect of fish powder using on wood plastic composite biodegradability
ali kazemiAs the use of wood plastic composites (WPC) in various industries has increased significantly and due to the high importance of environmental issues in industry and research and the fact that products made of petroleum polymers have too little biodegradability, it is im MoreAs the use of wood plastic composites (WPC) in various industries has increased significantly and due to the high importance of environmental issues in industry and research and the fact that products made of petroleum polymers have too little biodegradability, it is important to conduct research to improve and solve this environmental problem. Due to the high amount of volatile nitrogen, low quality fish powder is not used in the industry, and as a result, it can be use as cheap and biodegradable filler in wood plastic. In this research, the effect of fish powder amount, substrate type, and coupling agent (MAPE) amount on the physical characteristics of wood-plastic composite was investigated. The results showed that by increasing fish powder amount and decreasing coupling agent amount, the highest amount of degradability is obtained. Manuscript profile -
Open Access Article
24 - Improved Fiber Bragg Grating Bending-Sensor Using TE/TM Modes
Saman Jafari Aida Esmaeilian-MarnaniAfter the advent of optical fibers and cheap respective parts, using fiber optic sensors flourished. Bending is one of the significant parameters by measuring which, using optical fiber sensors, mechanical system mode can be set. Advantages of the fiber optic sensors, e MoreAfter the advent of optical fibers and cheap respective parts, using fiber optic sensors flourished. Bending is one of the significant parameters by measuring which, using optical fiber sensors, mechanical system mode can be set. Advantages of the fiber optic sensors, especially fiber Bragg grating sensors, that are free from many of resistive sensor problems, attracted researchers to focus on bending sensors based on optical fibers. However, uncertainty is still a major challenge for developing such sensors. In this article, one fiber optic bending sensor is simulated attempting to increase accuracy. First, bending in fiber Bragg grating is simulated, observing characteristic changes of reflection and transmission in TE and TM modes according to bending. Then, the number of resonance peaks and related distance, in TE and TM modes, is employed to determine the radius of curvature. This method in comparison to previous methods based on the return wavelength measurement, is more accurate. Because the number of resonance peak and related distance changes versus bending changes is more than those of return wavelength changes. Manuscript profile -
Open Access Article
25 - Robust DOA Estimation in the Presence of Mutual Coupling effect with Application in Auxiliary Vehicle Positioning
Zahra Dehghani Naser Parhizgar Hamid AzadAs an important branch of the Internet of Vehicles (IoV), vehicle positioning has drawn extensive attention. Traditional positioning systems based on a global positioning system incur long delays, and may fail due to obstructions. In this article, we propose an auxiliar MoreAs an important branch of the Internet of Vehicles (IoV), vehicle positioning has drawn extensive attention. Traditional positioning systems based on a global positioning system incur long delays, and may fail due to obstructions. In this article, we propose an auxiliary positioning architecture, whose core is to estimate the direction of arrival (DOA) of signals from landmarks, such as wireless access points, utilizing a sensor array in the vehicle. Due to space limitations, the array may be placed in an arbitrary geometry and may suffer from mutual coupling effects, and it is possible that the effect of mutual coupling between the array elements greatly reduces the independence of the elements of the array, and this effect involves the interaction of each element with its nearby objects. Mutual coupling in antenna arrays can critically degrade the performance of signal processing algorithms. In this paper, a new and accurate form of mutual impedance matrix (MIM) is used to compensate for the effect of mutual coupling in uniform linear arrays (ULA) by a new method based on solving the boundary value problem for all array elements. By using the MIM in the DOA estimation algorithms, these algorithms will be robust to the mutual coupling effect. The simulation results confirm the performance improvement of the proposed DOA estimation algorithm. The proposed architecture can obtain robust self-localization with existing vehicular ad hoc networks, and it can collaborate with other positioning systems to provide a safe driving environment. Manuscript profile -
Open Access Article
26 - Design and Fabrication of Novel Single- and Dual-band Bandpass Filters with Modern Zero-Degree Feed Structure for Wireless Communications
Mohammad Reza Zobeyri Ahmadreza EskandariIn this paper, there are three novel bandpass filters (BPFs), consist of single- and dual-band, presented in a same size, which all the filters, have been designed, optimized and finally fabricated and measured, based on a primary structure and using planar microstrip t MoreIn this paper, there are three novel bandpass filters (BPFs), consist of single- and dual-band, presented in a same size, which all the filters, have been designed, optimized and finally fabricated and measured, based on a primary structure and using planar microstrip technology. Each of the generated passbands, is resonated by the use of one of the two existing types of resonator structures. The larger resonators, as main-structures of the filter with a stepped-impedance features, by appling 0°-feed structure and electrical coupling in-between, create the first passband at 0.9 GHz. The smaller resonators as sub-structures, with dual-spiral topology, are in the same size and uniform-impedance, and with symmetrical feeding and internal coupling, are embedded in the main-structures to generate and control the higher passband at 1.8GHz. The existence of a cross-coupling between the sub-structures, suppresses any harmonics in the stop-band and generates additional transmission zeros on both sides of the upper passband. Overal dimensions of the innovative filters with a miniaturizing approach, are reduced from 0.163λg*0.09λg to 0.092λg*0.08λg in terms of the guided wavelength, which is the most compacted structure compared with other filters. According to 0.7 dB and 0.5 dB, the obtained insertion losses of the first and second passbands of the dual-band BPF respectively, the lowest losses have been achieved, compared with other examined dual-band BPFs. Finally three prototypes for global systems for mobile communication, were fabricated and measured. A good agreement between the measured and simulated results indicates realizing the goals and ingenious methods of this design. Manuscript profile -
Open Access Article
27 - Design and Simulation of a Compact UWB MIMO Antenna with Mutual Coupling Reduction
Narges Malekpour Mohammad Amin Honarvar Abdolmehdi DadgarpourIn this paper, A compact multiple-input-multiple-output (MIMO) antenna with a small size of 26×31mm2 is proposed for portable ultrawideband (UWB) applications. The antenna consists of two square-monopole antenna with microstrip-fed by a 50- Ω printed on one side o MoreIn this paper, A compact multiple-input-multiple-output (MIMO) antenna with a small size of 26×31mm2 is proposed for portable ultrawideband (UWB) applications. The antenna consists of two square-monopole antenna with microstrip-fed by a 50- Ω printed on one side of the substrate. To enhance isolation and increase impedance bandwidth, two long ground stubs are added to the ground plane on the other side. Simulation is used to study the antenna performance in terms of reflection coefficients at the two input ports, coupling between the two input ports, radiation pattern, realized peak gain, efficiency and envelope correlation coefficient. Results show that the MIMO antenna has an impedance bandwidth ( for S22< -10 dB) of larger than 3.1–10.6 GHz, low mutual coupling ( for S21< 3 dB) of less than -16 dB, and a low envelope correlation coefficient of less than 0.003 across the frequency band, making it a good candidate for portable UWB applications. Manuscript profile -
Open Access Article
28 - Design, Simulation and Fabrication of a Wideband Filter Using Multi-Mode Resonators in Three Layer Stripline Structure
Mehdi Karimiyan Pedram Seyed eftetahi Amir Mohammad KhezriIn this paper, in order to overcome the coupling and fabrication constraints of microstrip structures, 3 layer stripline structure be introduced and based on impedance steps and microwave coupled lines as impedance inverters and multi mode resonators, new and miniaturiz MoreIn this paper, in order to overcome the coupling and fabrication constraints of microstrip structures, 3 layer stripline structure be introduced and based on impedance steps and microwave coupled lines as impedance inverters and multi mode resonators, new and miniaturized structures are proposed. Using this structure, several 2-6 GHz wideband filters has been designed and simulated, and some effective techniques to reducing virtual resonances and improving slope of filter introduced. Finally, a wideband filter is fabricated and using simulation and measurement, efficiency of method is shown. Manuscript profile -
Open Access Article
29 - Synthesis of novel tridentate ligand-based palladium catalyst and investigation of its reactivity towards Suzuki, Sonogashira and Heck coupling reactions
Rajendran Nagarajan Panneer Selvam Rajeswari Lourdusamy Emmanuvel -
Open Access Article
30 - Carbon catalyst derived from Himalayan pine for the C-N coupling of organic molecules leading to pyrrole formation
Neeraj Gupta Pushpa Bhardwaj Amit Kumar -
Open Access Article
31 - An environmentally friendly approach to the synthesis of azo dyes based on 2-naphthol using kaolin-SO3H nanoparticles
Abdolhamid Bamoniri Bi Bi Fatemeh Mirjalili Nahid Yaghmaeiyan-Mahabadi -
Open Access Article
32 - Synthesis of 1,3-diphenyl-2-propyn-1-ol derivatives in water catalyzed by silver ions immobilized on the magnetic cross-linked chitosan
Fatemeh Rafiee Sahar Kermani -
Open Access Article
33 - اثر چندشکلیهای UCP روی صفات رشد، ارزش اصلاحی صفات رشد و صفات تولیدمثلی در مرغ بومی فارس
آ. محمدیفر م.ر. محمدآبادیپروتئین غیر مزدوج طیور (avUCP) عضوی از فوق خانواده ناقلین میتوکندریایی است که ورود پروتئین به ماتریکس میتوکندری را از سنتز ATP آزاد می­کند. از روش PCR-RFLP برای برآورد فراوانی­های آللی و ژنوتیپی چندشکلی­های UCP/HhaI استفاده شد و همبستگی بین این چندشکلی­ه Moreپروتئین غیر مزدوج طیور (avUCP) عضوی از فوق خانواده ناقلین میتوکندریایی است که ورود پروتئین به ماتریکس میتوکندری را از سنتز ATP آزاد می­کند. از روش PCR-RFLP برای برآورد فراوانی­های آللی و ژنوتیپی چندشکلی­های UCP/HhaI استفاده شد و همبستگی بین این چندشکلی­ها و صفات رشد، ارزش­ اصلاحی صفات رشد و تولیدمثلی در مرغ بومی فارس محاسبه شد. برای این منظور اطلاعات فنوتیپی 18 نسل متوالی از 200 پرنده با استفاده از مدل حیوانی تک صفتی با روش ASREML آنالیز شد. ارزیابی همبستگی بین این SNP با صفات تولیدمثلی اثر مثبت ژنوتیپ TC را با سن اولین تخم­گذاری (ASM) در مقایسه با ژنوتیپ CC پیشنهاد می­کند. به علاوه، ژنوتیپ TC همبستگی معنیداری با ارزش اصلاحی سن اولین تخم­گذاری در مقایسه با ژنوتیپ CC نشان داد (05/0>P). در نتیجه، نتایج این پژوهش پیشنهاد می­کند که ژنوتیپ TC ژن UCP با سن بلوغ جنسی (ASM) و ارزش اصلاحی سن بلوغ جنسی همبستگی دارد و چندشکلی­های UCP می­توانند به عنوان نشانگرهای DNA برای انتخاب در فرآیند اصلاح نژاد مرغ بومی فارس مورد استفاده قرار گیرند. Manuscript profile -
Open Access Article
34 - Abiotic stress trigger mitochondrial defense system: A comprehensive review.
Khalil saad-Allah Ibrahim Abdelsalam -
Open Access Article
35 - Evaluation of reliability of object-oriented systems based on Cohesion and Coupling Fuzzy computing
Samira Kalantari Masoomeh Alizadeh Homayoun Motameni -
Open Access Article
36 - Preparation of heterogeneous magnetic nanocatalysts based on reduced graphene oxide with nickel and cobalt particles and investigation of its activity in Heck and sonogashira cross-coupling reactions and 4-nitrophenol reduction
abdolreza abri forough matloubiToday catalysts are widely used in the production of various materials. Nano-catalysts according to their importance have become one of the most important areas for Nanotechnology research. Development of magnetic catalysts for carbon–carbon and carbon–heter MoreToday catalysts are widely used in the production of various materials. Nano-catalysts according to their importance have become one of the most important areas for Nanotechnology research. Development of magnetic catalysts for carbon–carbon and carbon–heteroatom coupling reactions are one of the most important issues in terms of applications to organic synthesis. At present, many researches are focused on the construction of more active and more stable, heterogeneous Nano-sized metal catalysts, which can be recovered and reused. Nickel and cobalt nanoparticles due to low prices, magnetic properties and high chemical activity attracted particular attention. In this work, nickel and cobalt nanoparticles were synthesized with a green and one-pot method on graphene oxide substrate for reduction reaction of 4-nitrophenol, Heck and Sonogashira cross-coupling reactions. Several characterization techniques such as FTIR, FESEM, XRD, and VSM were employed to characterize the Co and Ni nanoparticle reduced graphene oxide composites witch indicates that nickel and cobalt magnetic particles with a size of about 20-30 nanometers were uniformly anchored on graphene oxide nanosheets. In addition, results showed that incorporation of Co and Ni nanoparticles and GO produce much higher activity in cross-coupling and reduction reactions. The soft-ferromagnetic behavior of the RGO/CoxNi100-x nanocomposite demonstrated the easy separable from the reaction mixture and reusable several times without losing its catalytic activity, Hence, the RGO/CoxNi100-x composites can be a potential promising material to catalyze the cross-coupling reactions Manuscript profile -
Open Access Article
37 - Optimization of catalyst for oxidative cross-coupling reaction of pyridine N-oxides and benzofurans for the synthesis of biologically active compounds
ابراهیم کیان مهر رکسانا فضلی مارال غلامحسینیIn this study, oxidative coupling of pyridine N-oxides with benzofurans has been investigated through palladium-catalyzed oxidative coupling reactions. Benzofuran derivatives, especially 2-aryl benzofurans, exhibit many functional and biological properties such as antic MoreIn this study, oxidative coupling of pyridine N-oxides with benzofurans has been investigated through palladium-catalyzed oxidative coupling reactions. Benzofuran derivatives, especially 2-aryl benzofurans, exhibit many functional and biological properties such as anticancer, antifungal, and antimalaria activity. These compounds are also used to treat asthma and rheumatism. 2-Pyridyl benzofurans have electroluminescence properties and are used for imaging of beta-amyloid plaques in Alzheimer's disease. In this paper, a series of compounds with anticipated biological properties are prepared with high efficiency by direct formation of a carbon-carbon bond between the two carbon-hydrogen bonds of benzofuran and pyidine N-oxide derivatives bearing electron donating or withdrawing groups, using palladium acetate as a catalyst and copper acetate and bromide as oxidant Manuscript profile -
Open Access Article
38 - A Smart Noise-Coupling Technique for low power DT-Σ∆ Modulators
Habibeh Fakhraie Tohid Moosazadeh Reza Sabbaghi-nadooshan Alireza Hassanzadeh -
Open Access Article
39 - Novel Adaptive Damping Controller for Interline Power Flow Controller to Improve Power System Stability
Naser Taheri Hamed Orojlo Hamid Karimi Farhad Ebrahimi Kaveh Khalifeh -
Open Access Article
40 - Microwave assisted oxidation coupling of thiols to symmetrical disulfides with tripropylammonium fluorochromate (VI) (TPAFC)
Mohammad Kazem Mohammadi Neda Hasanzadeh Shahriare Ghammamy -
Open Access Article
41 - Spectrophotometric Determination of Methyldopa and Levodopa by Oxidative Coupling Reactions using the synthesis reagent (2-amino-5-(para-aminophenyl)-1,3,4-thiadiazole) and Investigation of Biological Activity
Doaa Ezaldeen Al-Rashidi Mohammed S. Al-Enizzi Mohanad Y. SalehBased on oxidative coupling reactions utilizing the synthesized organic reagent 2-amino-5-(para-aminophenyl)-1,3,4-thiadiazole in acidic media, and with potassium dichromate as an oxidizing agent, a spectrophotometric method has been established for determining methyldo MoreBased on oxidative coupling reactions utilizing the synthesized organic reagent 2-amino-5-(para-aminophenyl)-1,3,4-thiadiazole in acidic media, and with potassium dichromate as an oxidizing agent, a spectrophotometric method has been established for determining methyldopa and levodopa. For these drugs, the resultant complex exhibits peak absorption at 401.5 nm and 415 nm, respectively. The method adheres to Beer's law in the ranges of 1-55 µg ml-1 and 2.5-170 µg ml-1, with molar absorption coefficients of 0.24 x 104 and 0.116 x 104 L mol-1 cm-1, respectively. The quantification limit (LOQ) is set at 1.5769 µg ml-1 for methyldopa and 3.0616 µg ml-1 for levodopa, yielding recovery rates of 100.14% and 100.34%, and relative standard deviation rates of 2.748% and 0.779%. The nature of the resulting complex was examined using the continuous variation method (Job's method) and molar ratios, revealing a 1:2 ratio (reagent to drug compound) for both drugs. This method has been successfully applied to pharmaceutical formulations. Manuscript profile -
Open Access Article
42 - خیز و ارتعاشات آزاد پنل ساندویچی با هسته لانه زنبوری بر بستر الاستیک وینکلر
یونس یوسفی حسین وحدانی فر رضا شیرانی محمد دهقانی. در این مقاله به بررسی خیز و ارتعاشات آزاد پنل ساندویچی پرداختهشده است. هسته ساندویچ پنل از نوع لانهزنبوری ششوجهی و رویههای آن از دو ماده متفاوت Carbon fiber reinforced plastic و K-aryl/epoxy در نظر گرفتهشده است. معادلات حاکم بر پایه تئوری تغییر شکل برشی مرتبه اول More. در این مقاله به بررسی خیز و ارتعاشات آزاد پنل ساندویچی پرداختهشده است. هسته ساندویچ پنل از نوع لانهزنبوری ششوجهی و رویههای آن از دو ماده متفاوت Carbon fiber reinforced plastic و K-aryl/epoxy در نظر گرفتهشده است. معادلات حاکم بر پایه تئوری تغییر شکل برشی مرتبه اول استخراج گردیده و برای حل معادلات از روش عددی دیفرانسیل مربعات تعمیمیافته استفادهشده است. جهت اعتباربخشی به روش دیفرانسیل مربعات بهکاررفته در این مقاله از روش کلاسیک با حل گالرکین ارائهشده در مراجع استفادهشده و نشان دادهشده که روش دیفرانسیل مربعات تعمیمیافته به کار گرفتهشده دارای نتایج خوب با درصد خطای نسبی پایین نسبت به مقاله مرجع یادشده است. تغییر شکل ایجادشده در پنل ساندویچی به ازای دو نوع بارگذاری متفاوت موردبررسی قرارگرفته است. درنهایت فرکانسهای طبیعی برای چهار مد اول برای دو ماده متفاوت رویهها به دست آورده شده و تأثیر نسبتهای متفاوت طول به ضخامت هسته و نسبت ضخامت رویهها به ضخامت هسته لانهزنبوری بر مقدار فرکانس طبیعی بررسیشده است. همچنین تأثیر ضریب سختی فونداسیون برخیز ایجادشده و فرکانس طبیعی، ارائه گردیده است. Manuscript profile -
Open Access Article
43 - برداشت انرژی الکتریکی از تیر نانو با لایه پیزوالکتریک تحت ارتعاشات اتفاقی
حسین وحدانی فر رضا شیرانی محمد دهقانی یونس یوسفی در مقاله حاضر، برداشت انرژی الکتریکی از ارتعاشات اتفاقی تیر نانو اویلر- برنولی با دولایه پیزوالکتریک بررسی میگردد. تیر مذکور از یک لایه آلومینیم و دو لایه پیزوالکتریک سرامیکی با نام اختصاری PZT 5A بهعنوان لایه حسگر برداشت انرژی تشکیل شده است. در روش پیش رو مع More در مقاله حاضر، برداشت انرژی الکتریکی از ارتعاشات اتفاقی تیر نانو اویلر- برنولی با دولایه پیزوالکتریک بررسی میگردد. تیر مذکور از یک لایه آلومینیم و دو لایه پیزوالکتریک سرامیکی با نام اختصاری PZT 5A بهعنوان لایه حسگر برداشت انرژی تشکیل شده است. در روش پیش رو معادلات حاکم بر نانو تیر بایمورف بهصورت تحلیلی با استفاده از تئوری کلاسیک تیرها به همراه اعمال ضریب اصلاحی ساختار نانو به دست خواهد آمد. سپس با استفاده از روش کانتروویچ معادلات سیستم به دست آمده حل خواهند شد. شرایط مرزی در نظر گرفتهشده برای تیر نانو بهصورت یکسر گیردار و جرم متمرکز انتهای آزاد تیرمی باشد و تابع تحریک ورودی سیستم جهت برداشت انرژی بهصورت اتفاقی در نظر گرفتهشده است. با توجه به اینکه در این پژوهش هدف بررسی میزان برداشت انرژی است بنابراین در قسمت نتایج نمودارهای ولتاژ و حداکثر قدرت خروجی تیر بایمورف نانو تحت تحریک اتفاقی و ورودی نویز سفیدو همچنین تأثیر خواص و ضریب مقیاس ذرات نانو بر میزان برداشت انرژی ارائه شده است. Manuscript profile -
Open Access Article
44 - بررسی اثر سرعت لیزر در خمش ورق فلزی توسط لیزر با استفاده از تحلیل عددی و تجربی در مکانیزم گرادیان حرارتی
حسن مسلمی نائینی ولی اله پناهی زاده محمد حسین پور گللو سیامک مزدکدر این مطالعه فرایند گرمایش خطی با لیزر برای سه سرعت مختلف بهصورت تحلیل عددی و آزمایش تجربی بررسی شده است. تحلیل عددی از نوع تحلیل کوپله (حرارتی- مکانیکی) و با استفاده از نرم افزار ANSYS صورت گرفته است. همچنین برای آزمایشهای تجربی ورقهای فلزی به کمک لیزر توان پائین، ش Moreدر این مطالعه فرایند گرمایش خطی با لیزر برای سه سرعت مختلف بهصورت تحلیل عددی و آزمایش تجربی بررسی شده است. تحلیل عددی از نوع تحلیل کوپله (حرارتی- مکانیکی) و با استفاده از نرم افزار ANSYS صورت گرفته است. همچنین برای آزمایشهای تجربی ورقهای فلزی به کمک لیزر توان پائین، شکلدهی شدهاند. قبل از انجام آزمایشها، ابتدا روش طراحی آزمایشهای عاملی کامل (Full Factorial Design) انتخاب و با توجه به این طراحی، قطعههای مورد نیاز با اندازهها و ضخامتهای معین تهیه شد. این آزمایشها با لیزر CO2 با بیشترین توان (200 وات) انجام و پس از آن برای افزایش دقت اندازهگیری زوایا، با استفاده از دستگاه CMM قطعات شکلدهی شده، اندازه گیری شدند. سپس تحلیل آماری روی نتایج آزمایشهای تجربی صورت گرفت. نتایج بدست آمده تطابق خوبی بین نتایج آزمایشهای تجربی و تحلیل عددی را نشان میدهد. از نتایج بدست آمده میتوان گفت که رابطة عکس بین افزایش سرعت و زاویة خمش وجود دارد. در ضمن با افزایش سرعت لیزر نرخ کاهش زاویة خمش آهسته تر میشود. همچنین برای نقاط نزدیک به مسیر حرکت لیزر، با افزایش سرعت لیزر، شدت افت دما بیشتر میشود. Manuscript profile -
Open Access Article
45 - Spectroscopic study of diphenyl [(S)-(–)-1-phenylpropanamido]-phosphate: differences of diastereotopic groups
Farnaz Eslami Mehrdad Pourayoubi Fahimeh Sabbaghi Sahar BaniyaghoobAbstract The synthesis and crystal structure of diphenyl [(S)-(–)-1-phenylpropanamido]-phosphate, (C6H5O)2P(O)[NH-(S)-(–)CH(C2H5)(C6H5)], was previously reported. Here, the spectroscopic features (1H-NMR, 13C{1H}-NMR, 31P{1H}-NMR and IR) are investigated. In the 1H-NMR MoreAbstract The synthesis and crystal structure of diphenyl [(S)-(–)-1-phenylpropanamido]-phosphate, (C6H5O)2P(O)[NH-(S)-(–)CH(C2H5)(C6H5)], was previously reported. Here, the spectroscopic features (1H-NMR, 13C{1H}-NMR, 31P{1H}-NMR and IR) are investigated. In the 1H-NMR and 13C{1H}-NMR spectra, the diastereotopic C6H5O groups show two sets of signals. Typically, in the 13C{1H}-NMR spectrum, the doublets at 151.08/151.20 ppm and 120.52/120.55 ppm, with 2JCP = 6.5/6.6 Hz for the first pair and 3JCP = 4.9/4.7 Hz for the second pair are associated to the diastereotopic ipso-C atoms and diastereotopic ortho-C atoms. In the 1H-NMR spectrum, the signals related to diastereotopic phenyl groups overlap with those of phenyl group of chiral amine. The ipso-carbon atom of chiral amine fragment appears a doublet signal at 144.85 ppm (3JCP = 2.7 Hz). The phosphorus signal (31P{1H}-NMR) appears at –0.49 ppm. in this work NMR and spectroscopic main part are going to be consider and proved because of the chiral importance in drug delivery. Keywords: Amidophosphodiester; IR; NMR; Phosphorus-carbon coupling constant Manuscript profile