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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: VETERINARY RESEARCH FORUM
- نوع مقاله: Journal Article
- کلمات کلیدی: Electromagnetic Field,Corticosterone,Free-T3,Free-T4,Malonyldialdehyde
- چکیده:
- چکیده انگلیسی: The main goal of this study was to evaluate the possible effect of whole-body magnetic field (MF) exposure on the variations of corticosterone, Free-T3, Free-T4 and malonyl dialdehyde in plasma in 48 adult white New Zealand male rabbits. Animals were divided into six groups namely, C1 (normal diet, not exposed), C2 (normal diet, sham exposed), T1 (normal diet, exposed to electromagnetic field), C3 (high-cholesterol diet, not exposed), C4 (high-cholesterol diet, sham exposed) and T2 (high-cholesterol diet, exposed to electromagnetic field). In eight separate experiments, sham exposed groups (C2 and C4), were exposed to sham stimulated (without electromagnetic stimulation) for 5 days, 2 hour/day and the rabbits of the treatment groups (T1 and T2) were treated with triangular form 10 Hz of electromagnetic field for 5 days, 2 hour/day, while the control groups (C1 and C3) had no any exposure. At the end of the exposure, after a 12- hour fasting period, blood samples were taken and level of corticosterone, Free-T3 and Free-T4 were measured by Elisa kits and level of malonyldialdehyde was measured by spectrophotometric method. The results indicated that the blood serum levels of Free-T3, Free-T4 and Corticosterone in the T1 and T2 groups were significantly increased compared to those of their own control groups (P < 0.05). Malonyldialdehyde levels in T2 animals showed a significant decrease compared to that of animals of C3 and C4 (P < 0.05). We conclude that 10 Hz pulsed electromagnetic field can alter the levels of Free-T3, Free-T4 and corticosterone in animals with both normal diet and hyperchlosterol diet and also alter the amount of malonyldialdehyde in animals with hyperchlosterol diet.
- انتشار مقاله: 07-10-1391
- نویسندگان: Ehsan Hosseini,Saeed Nafisi,Samad Zare
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Renewable Energy and Environment
- نوع مقاله: Journal Article
- کلمات کلیدی: wind turbines,controller,Maximum power tracking,blade pitch angle control
- چکیده:
- چکیده انگلیسی: The most common controller in wind turbine is the blade pitch angle control in order to get the desired power. Controlling the pitch angle in wind turbines has a direct impact on the dynamic performance of the machine and fluctuations in the power systems. Due to constant changes in wind speed, the wind turbines are of nonlinear and multivariate system. The design of a controller that can adapt itself with the system, at any given time, is of crucial importance. To limit the aerodynamic power gained from the wind turbine in the high wind speed areas, different methods has are applied on pitch angle. In this paper an extensive literature review on pitch angle control technique in wind turbine has been highlighted. Classical and adaptive controllers, structure control, robust control and intelligent control are among the control methods adopted in this study. In comparison of the controllers, although adaptive and robust controllers, with less sensitivity to changes in environmental conditions, outperform the classic controller, the intelligent controller system presents the best performance of the wind turbines through estimating the system variables and appropriate adaptation to changes at the operating point.
- انتشار مقاله: 11-12-1395
- نویسندگان: Ehsan Hosseini,Ghazanfar Shahgholian
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Renewable Energy and Environment
- نوع مقاله: Journal Article
- کلمات کلیدی: PI controller,WECS,blade pitch angle control,G-S RANFIS controller
- چکیده:
- چکیده انگلیسی: The effective utilization of wind energy conversion system )WECS( is one of the most crucial concerns for the development of renewable energy systems. In order to achieve appropriate wind power, different pitch angle methods are used. Recurrent Adaptive Neuro-Fuzzy Inference System (RANFIS) is utilized in this paper in a new effective design to improve the performance of classical and adaptive Proportional Integral (PI) controllers applied for the pitch control purposes. Adaptive-online performance and high robustness coverage are the main advantages of the suggested controller. The effectiveness of the proposed method is verified by a simplified two-mass wind turbine model and a detailed aero-elastic wind turbine simulator (FAST7). At any given wind speed, the proposed controller has outperformed PI, Adaptive Neuro-Fuzzy Inference System (ANFIS), and RANFIS based controllers, reducing the mechanical stress of drive train while presenting suitable aerodynamic power tracking and maintaining the rotational speed of the rotor under the rated value.
- انتشار مقاله: 22-04-1398
- نویسندگان: Ehsan Hosseini,Ehsan Aghadavoodi,Ghazanfar Shahgholian,Homayoun Mahdavi-Nasab
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Total dissolved solids,Membrane process,d-optimal design,Iron Ore Effluent
- چکیده:
- چکیده انگلیسی: The desalination process consists of a set of multi-step actions, which are conducted on saline water in order to remove excess salts and other minerals. In the desalination process, water is recovered, so that it would be suitable for industrial usage. In the present study, electrodialysis (ED) was used for desalination, especially for removing chloride (Cl-) ion and total dissolved solids (TDS), in Gohar Zamin Iron Ore Concentrate Plant (GIOCP). To optimize the influential factors in the removal of chloride and TDS in ED, the response surface methodology (RSM) was utilized. To this end, the D-optimal experimental design was applied to optimize the experiments. The effects of three independent parameters, including electrolysis time (A), consumption voltage (B), and initial concentration of chloride ion (C), were assess for the removal of chloride and TDS from recovered water. In addition, interactive and linear models were applied to determine the responses of chloride and TDS removal rates, respectively. The optimal operating conditions for the removal of chloride with 51.46% efficiency were obtained at the runtime of 30 minutes, consumption voltage of 12 V, and initial concentration of 300 ppm. Similarly, optimal TDS removal with 48.03% efficiency was achieved at the runtime of 30 minutes, consumption voltage of 12 V, and initial concentration of 300 ppm. According to the findings, ED was a highly reliable method for the removal of salts from water, as well as the high-quality recycling of water from mineral industries, especially in mineral processing plants.
- انتشار مقاله: 26-08-1397
- نویسندگان: Seyed Morteza Moosavirad,Ehsan Hosseinipoor
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Total dissolved solids,Membrane process,d-optimal design,Iron Ore Effluent
- چکیده:
- چکیده انگلیسی: The desalination process consists of a set of multi-step actions, which are conducted on saline water in order to remove excess salts and other minerals. In the desalination process, water is recovered, so that it would be suitable for industrial usage. In the present study, electrodialysis (ED) was used for desalination, especially for removing chloride (Cl-) ion and total dissolved solids (TDS), in Gohar Zamin Iron Ore Concentrate Plant (GIOCP). To optimize the influential factors in the removal of chloride and TDS in ED, the response surface methodology (RSM) was utilized. To this end, the D-optimal experimental design was applied to optimize the experiments. The effects of three independent parameters, including electrolysis time (A), consumption voltage (B), and initial concentration of chloride ion (C), were assess for the removal of chloride and TDS from recovered water. In addition, interactive and linear models were applied to determine the responses of chloride and TDS removal rates, respectively. The optimal operating conditions for the removal of chloride with 51.46% efficiency were obtained at the runtime of 30 minutes, consumption voltage of 12 V, and initial concentration of 300 ppm. Similarly, optimal TDS removal with 48.03% efficiency was achieved at the runtime of 30 minutes, consumption voltage of 12 V, and initial concentration of 300 ppm. According to the findings, ED was a highly reliable method for the removal of salts from water, as well as the high-quality recycling of water from mineral industries, especially in mineral processing plants.
- انتشار مقاله: 26-08-1397
- نویسندگان: Seyed Morteza Moosavirad,Ehsan Hosseinipoor
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Economic Review
- نوع مقاله: Journal Article
- کلمات کلیدی: G13,G22,Keywords: Portfolio Optimization,Konno Linear Programming Model. JEL Classification: G11
- چکیده:
- چکیده انگلیسی: I
ran Insurance Company intends to raise its financial credit and render enhanced services to the insured and the public. The need to meet financial obligations arising from the claims requires determination of the optimum deposited claims reserve with banks. Therefore, the present research study aimed at finding the loss ratio (incurred losses to premium), and determining the optimum portfolio of risky and risk-free assets of insurance companies during 1996-2017 by conducting a case study on Iran Insurance Company. Based on the relevant data, the highest loss ratio with 81 percent belonged to 1998-99 and the lowest ratio with 62 percent belonged to 2003-2004. To determine the optimum portfolio of Iran Insurance Company, Konno Mean-Absolute Deviation Portfolio Optimization Model was utilized. According to the Konno Model, the optimum portfolios of risk-free and risky assets are as follows: Short-term banking deposits with 9 percent, long-term banking deposits with 46 percent, bank certificates of deposits (CDs) and participation papers with 9 percent, stocks of companies listed on Tehran Stock Exchange (TSE) with 17 percent, stocks of companies not listed on the TSE with 11 percent, and other assets, i.e. risky assets, including housing loan for employees of insurance companies, offering facilities to the agencies of insurance companies, purchasing immovable assets, and other financial instruments and constructions with 8 percent.
- انتشار مقاله: 16-06-1399
- نویسندگان: Ezatollah Abbasian,Seyed Ehsan Hosseinidoust
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Economic Review
- نوع مقاله: Journal Article
- کلمات کلیدی: C53,E37,C11,Keywords: Dynamic Modeling,Inflation Forecasting,TVP-DMS Model. JEL Classification: E31
- چکیده:
- چکیده انگلیسی: I nflation forecast is one of the tools in targeting inflation by the central bank. The most important problem of previous models to forecast the inflation is that they could not provide a correct prediction over time. However, the central bank policymakers shall seek to create economic stability by ignoring the short-term and temporary changes in price and regarding steady inflation. On this basis, in the present paper, it has been aimed to provide nonlinear dynamic models to simulate the inflation in the economy of Iran using quarterly data referring to 1988- 2012 as well as TVP-DMA and TVP-DMS models. These models can provide changes in input variables as well as changes in the coefficients of the model over time. Based on the results, the possibility of growth of currency in circulation, economic growth, also the growth of deposits either visual or non-visual variables, is more remarkable in modeling of inflation in economy of Iran. In addition, the predictive power of dynamic models presented in this study is more than other models.
- انتشار مقاله: 08-08-1396
- نویسندگان: Mohsen Khezri,Seyed Ehsan Hosseinidoust,Mohammad Kazem Naziri
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Molecular and Clinical Microbiology
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,PCR,Helicobacter pylori,Colorectal cancer,gastrointestinal diseases
- چکیده:
- چکیده انگلیسی: Colorectal cancer (CRC) has defined as the uncontrolled growth of cells in the colon or rectum. The human colon contains the greatest number of microbes Therefore, microbes may play an important role in the development of colorectal cancer. Recent studies have shown an association between the microbial infection and the risk of colorectal cancer. However, the results of these studies are controversial. The nobility of the present study was to assess the prevalence of Helicobacter pylori infection in the colorectal cancer in Iran. The biopsy were done and the samples were obtained from patients suspected with colorectal cancer, from 2015 to 2017.Secondary, DNA of Helicobacter pylori was extracted by Commercial kit. PCR was performed for Helicobacter pylori glmM gene eventually, the data was analysed. A total of 86 patients in which 68 of them confirmed with CRC and 17 patients considered as controls. Of 68 biopsy specimens and control group, all of them were negative for Helicobacter pylori. It was ultimately attained that in colorectal cancer, there was no presence of Helicobacter pylori.
- انتشار مقاله: 18-06-1397
- نویسندگان: Parisa Abedi Elkhichi,Hossein Dabiri,Ehsan Nazemalhosseini Mojarad,Sama Rezasoltani,HAMID Asadzadeh Aghdaei,Ramin Pouriran,Mohammad Javad Nasiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Environmental Energy and Economic Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Economic Growth,Greenhouse gas emission,Electricity consumption,TVP-VAR
- چکیده:
- چکیده انگلیسی: The link between economic growth and environmental pollution has been extensively and statistically analyzed over the past two decades. The present study investigates the nonlinear effects of variables affecting greenhouse gas emissions. To this aim, a Time Varying Parameters Vector Autoregression (TVP-VAR) model has developed using annual data which covers period of 1972-2018. Moreover, the associated Impulse Response Function (IRF) of the selected influential variables such as GDP (oil, without oil) and electricity consumption on the greenhouse gas emissions (carbon dioxide) are computed. Findings revealed the nonlinear impact of GDP on the greenhouse gas emission, so that until 2002 it had a positive effect on reducing greenhouse gas emission but from 2002 onwards it had a negative effect and led to escalate the greenhouse gas expansion. In addition, the positive shock of electricity consumption and GDP (without oil) on greenhouse gas emissions during the entire period was positive. Furthermore, the emission of greenhouse gas on itself is positive throughout the study period and in some years this effect has increased.
- انتشار مقاله: 01-12-1398
- نویسندگان: Seyed Ehsan Hosseinidoust,Mohsen Khezri,Asma Shiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Civil Engineering Infrastructures Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: finite difference method,Bomb,Passive Defense,Underground structure
- چکیده:
- چکیده انگلیسی: Dynamic response of underground structures has always been a topic of concern for designers and researchers. The behavior of these complicated systems under blast loading is affected by various factors and parametric studies are required to investigate their significance. The importance of soil density around the underground structure through which, the waves of explosion of a penetrator bomb is transferred, has been studied in this paper by using finite difference method (FDM). According to the results, soils with higher degrees of compactioncan absorb explosion energy more significantly. Therefore, the displacements and stresses of underground structure lining in denser soils are moderately lower. Thebending moment of the lining should be given attention, as regards being a critical design parameter.
- انتشار مقاله: 18-05-1393
- نویسندگان: M.J. Seyedan,Ehsan Seyedi Hosseininia
- مشاهده