• فهرست مقالات Dynamic Behavior

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        1 - ارائه الگوی ترکیبی داده کاوی با استفاده از قواعد انجمنی و خوشه بندی جهت شناسایی الگوهای غالب رفتار مشتریان (مطالعه موردی : بانک انصار)
        ایمان غریب عباس طلوعی کامبیز حیدرزاده
        با توجه به رقابت بانک‌ها در جذب مشتریان و تاثیر عوامل روانشناختی و محیطی بر روی رفتار آنها در طول زمان، در بخش بندی مشتریان میبایست پویایی رفتار آنها را مورد بحث قرار داد. شناسایی الگوهای غالب رفتاری مشتریان و انتقال آن به بخشهای مختلف در طول زمان از موضوعات مهم این حوز چکیده کامل
        با توجه به رقابت بانک‌ها در جذب مشتریان و تاثیر عوامل روانشناختی و محیطی بر روی رفتار آنها در طول زمان، در بخش بندی مشتریان میبایست پویایی رفتار آنها را مورد بحث قرار داد. شناسایی الگوهای غالب رفتاری مشتریان و انتقال آن به بخشهای مختلف در طول زمان از موضوعات مهم این حوزه میباشد. این پژوهش بر آن است با تمرکز بر پویای رفتار مشتریان به شناسایی گروه‌های‌رفتاری، الگوهای غالب جابجایی، ویژگی‌ها و الگوهای حاکم بر جابجایی مشتریان بانک انصار بپردازد. جهت استخراج الگوهای رفتاری، روشی ترکیبی مبتنی بر خوشه بندی و قوانین انجمنی (k-means و الگوریتم اپریوری) استفاده شده است. بر اساس نتایج بدست آمده چهار گروه رفتاری" مشتریان کم ارزش با الگوی پایدار"، "مشتریان کم ارزش با الگوی سودآوری ناپایدار"، "مشتریان رویگردان شده با سودآوری متوسط"، "مشتریان وفادار با سودآوری کم" شناسایی و ارتباط بین آنها مورد تحلیل قرار گرفته است. بر اساس یافته‌های بدست آمده، میتوان به مدیران ارشد در اتخاذ استراتژی‌های بازاریابی مناسب در جهت بهبود الگوهای رفتاری کمک شایان توجهی داشت. پرونده مقاله
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        2 - تحلیل رفتار هیدرودینامیکی بادگیرها در میانگین دمای داخلی سکونتگاه های اقلیم نیمه گرم و خشک کاشان با هدف کارآیی بیشتر
        محمد علی کرباسفروشها فرشته حبیب حسین ذبیحی
        یکی از راهها جهت دستیابی به ساختمان با کارایی بالاتر در مصرف انرژی و نیل به یک سامانه کارآمد، بهره گیری ازتجربیات معماری بومی میباشد.در این بین بادگیر یکی از المانهایی است که درگذشته به منظور ایجاد آسایش در اقلیم های گرم و خشک کاشان استفاده می شدند. این مطالعه رفتار هید چکیده کامل
        یکی از راهها جهت دستیابی به ساختمان با کارایی بالاتر در مصرف انرژی و نیل به یک سامانه کارآمد، بهره گیری ازتجربیات معماری بومی میباشد.در این بین بادگیر یکی از المانهایی است که درگذشته به منظور ایجاد آسایش در اقلیم های گرم و خشک کاشان استفاده می شدند. این مطالعه رفتار هیدرودینامیکی باد دراین المان را تحت تاثیر سطوح نم دار،دارای حوضچه و دارای فواره آب در میانگین دمای داخلی سکونتگاههای این اقلیم با هدف کارآیی بیشتر این عنصر توسط نرم افزار سی اف دی، انرژی پلاس و اپن استودیو با روش توصیفی-تحلیلی مورد بررسی قرار داده و سپس نتایج حاصله را مورد تحلیل قرار داده است.ودرنهایت مشخص میکندکه بیشترین افت دما در بادگیرهای دارای فواره آب می باشد و از عوامل اصلی افت دما در این بادگیرها، متناسب بودن ابعاد - دریچه ورود هوا به بادگیر، دمای آب، ابعاد و ارتفاع ستون بادگیر می باشد . پرونده مقاله
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        3 - Behavior Analysis of Wind Hydrodynamics in the Central Courtyard of Hot and Dry Climate Settlement Based on the Length to Height Ratio (Case Study: Kashan City)
        Mohammadali Karbasforoushha Fereshteh Habib Hossein Zabihi
        One of the ways to achieve high energy efficiency in buildings and an effective system is to utilize local architectural experiences. In this connection, the central courtyard is an element that was used in the past to create comfort in the hot and dry climates of Kasha چکیده کامل
        One of the ways to achieve high energy efficiency in buildings and an effective system is to utilize local architectural experiences. In this connection, the central courtyard is an element that was used in the past to create comfort in the hot and dry climates of Kashan, Iran. A large part of the literature in the past has focused on this space and investigated factors such as height, length, and presence of water in the courtyard, which are directly related to the studied space. This article concerns the hydrodynamic behavior of the wind under the effects of the length-to-height ratio to reduce the temperature of settlements in Kashan's hot and dry climate, aiming to yield the highest efficiency from this element. This study uses Fluent, Energy Plus, and Open Studio software using a descriptive-analytical method to analyze the data. In the end, it is determined that since the prevalent wind in Kashan comes from a northeast front, it can be utilized by placing the longitudinal direction of the central courtyard on its path. In addition, the optimal state in all models suggests the central courtyard has experienced a length-to-height ratio of 1to4, followed by a ratio of 1to5. پرونده مقاله
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        4 - Investigating the Effects of Expansion Equal Channel Angular Extrusion (Exp-ECAE) on Dynamic Behavior of AA7075 Aluminum Alloy
        J. Shahbazi Karami S. Sepahi-Boroujeni Mohsen Khodsetan
        Expansion equal channel angular extrusion (Exp-ECAE) is a severe plastic deformation (SPD) operation for processing bulk materials. In the current study, AA7075 Al was SPD-processed by expansion equal channel angular extrusion (Ex-ECAE) at various temperatures and ram v چکیده کامل
        Expansion equal channel angular extrusion (Exp-ECAE) is a severe plastic deformation (SPD) operation for processing bulk materials. In the current study, AA7075 Al was SPD-processed by expansion equal channel angular extrusion (Ex-ECAE) at various temperatures and ram velocities. Then, using split Hopkinson pressure bar (SHPB), the severely deformed products were compressed at room temperature and strain rates of 0.1~3000 s-1. Both the strain rate sensitivity (SRS) and the apparent activation volume (AAV) were determined for all deformed samples. The results revealed that the Ex-ECAE operation has noticeably increased the SRS. The tensile strength at a strain rate of 3000 s-1 was 6 times increased by conducting Ex-ECAE at 100 °C and with a ram velocity of 7 mm/min. Ex-ECAE was also capable of considerably decreasing the AAV. The results showed the yield stress of both the Exp-ECAE and the annealed samples increased with increasing the strain rate. Also, the results showed that after the Exp-ECAE process, the AAV reached to 6.3 b3 from the initial values of 118.5 b3 in the annealed state. پرونده مقاله
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        5 - Dynamics Analysis of the Steady and Transient States of a Nonlinear Piezoelectric Beam by a Finite Element Method
        M Jabbari M Ghayour H.R Mirdamadi
        This paper presents a finite element formulation for the dynamics analysis of the steady and transient states of a nonlinear piezoelectric beam. A piezoelectric beam with damping is studied under harmonic excitation. A numerical method is used for this analysis. In the چکیده کامل
        This paper presents a finite element formulation for the dynamics analysis of the steady and transient states of a nonlinear piezoelectric beam. A piezoelectric beam with damping is studied under harmonic excitation. A numerical method is used for this analysis. In the paper, the central difference formula of four order is used and compared with the central difference formula of two order in the time response of the structure. The NPBDA program is developed with Matlab software. In this program, the Newmark technique for dynamic analysis is used, the Newton-Raphson iterative and Simpson methods are used for the nonlinear solution. To verify the NPBDA results, the experimental results of Malatkar are used for the nonlinear vibration analysis of a beam without piezoelectric properties. Then, the piezoelectric effect on the frequency mode values and the time response are obtained. Afterwards, the modulation frequency in the nonlinear beam and the piezoelectric effect in this parameter are verified. پرونده مقاله
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        6 - Fuel Cell Voltage Control for Load Variations Using Neural Networks
        Zolekh Teadadi Hassan Changiziyan
        In the near future the use of distributed generation systems will play a big role in the production ofelectrical energy. One of the most common types of DG technologies , fuel cells , which can be connectedto the national grid by power electronic converters or work alon چکیده کامل
        In the near future the use of distributed generation systems will play a big role in the production ofelectrical energy. One of the most common types of DG technologies , fuel cells , which can be connectedto the national grid by power electronic converters or work alone Studies the dynamic behavior andstability of the power grid is of crucial importance. These studies need to know the exact model of dynamicelements. In this paper, a new method based on a neural network algorithm for controlling the fuel cellvoltage is provided. The effects of load change the output voltage characteristic of the fuel cell unit ischecked Simulations in MATLAB / SIMULINK. The results show that the prosecution is conducted in anappropriate manner Voltage Stabilization time. پرونده مقاله
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        7 - Analysis and Simulation Dynamic Behavior of Power System Equipped with PSS and Excitation System Stabilizer
        Arman Fattollahi Majid Dehghani Mohamad Reza Yousefi
        Power system is a nonlinear and temporal variable system. Different parts of the system change at different times and times with changing loads or loss of generators and disturbances. Power system stability and attenuation of low frequency fluctuations are very importan چکیده کامل
        Power system is a nonlinear and temporal variable system. Different parts of the system change at different times and times with changing loads or loss of generators and disturbances. Power system stability and attenuation of low frequency fluctuations are very important. To increase the damping power and stability of the dynamic system, power system stabilizers are used to reduce fluctuations by generating additional control signals for the generator excitation system. In this paper, to improve the stability of the power system dynamic, a power system stabilizer based on synergistic control theory with an excitation system stabilizer according to a simplified nonlinear power system is used. The power system stabilizer has been studied in a single machine system connected to an infinite bus. The results show that the use of power system stabilizer and excita-tion system stabilizer for all nonlinear dynamic systems performs better than synergistic PSS, conventional PSS, and a system without stabilizer. پرونده مقاله
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        8 - Study Effect of Deformation Nanochannel Wall Roughness on The Water-Copper Nano-Fluids Poiseuille Flow Behavior
        محمد میثم امراللهی پورشیرازی داود طغرایی احمدرضا عظیمیان
        In the nanochannel flow behavior with respect to expand their applications in modern systems is of utmost importance. According to the results obtained in this study, the condition of nonslip on the wall of the nanochannel is not acceptable because in the nano dimension چکیده کامل
        In the nanochannel flow behavior with respect to expand their applications in modern systems is of utmost importance. According to the results obtained in this study, the condition of nonslip on the wall of the nanochannel is not acceptable because in the nano dimensions, slip depends on different parameters including surface roughness. In this study, keeping the side area roughness, deformation effects on fluid flow behavior is investigated. Modeling software open source LAMMPS with equilibrium molecular dynamics simulations have been carried out. Unlike previous studies, existence fluid in laboratory conditions as water-copper nanofluids used. The results showed that rectangular was the most effective and triangular was least effective roughness on flow behavior, resulting in a rough triangular nanochannel slip occurs with more intensity.Existence roughness on the surface increases the number of oscillations in the fluid layer but amplitude near the wall is smooth to rough increased. Nanoparticles also increase the impact on the flow properties پرونده مقاله