Abstract Separators play a critical role in oil and gas industry by separating well outflows into... more Abstract Separators play a critical role in oil and gas industry by separating well outflows into natural gas, oil and/or water. A common method to design separators is using semi-empirical correlations. However, separator design is a complicated procedure and these correlations include several simplifying assumptions. Hence, evaluating their capability to design separators is necessary. In this study, a pilot two-phase separation unit is designed and constructed to examine the reliability of a selected correlation. The unit consists of a laboratory-scale horizontal two-phase separator, pumps and compressors to pressurize liquid and gas flows, a static mixer to create a two-phase flow, and a liquid filter. The experimental results from the unit show that the correlation could be modified to yield more accurate results. Therefore, including a correction factor into the correlation to reduce the error between the experimental and theoretical results is necessary. The experiments also show that the correction factor is not a constant value and depends on several parameters. Some of these parameters are gas flow rate, liquid density, liquid droplet diameter, drag coefficient, separator diameter, etc. Conducting experiments using the separation unit is time-consuming and costly. In addition, the sensitivity analysis required to develop a correlation between the correction factor and the parameters affecting it is not experimentally possible for some of the parameters. Thus, an artificial neural network is used to predict the correction factor and conduct sensitivity analysis. Because of the reasons mentioned above, obtaining enough experimental data to be used as input for the network is not possible. Therefore, computational fluid dynamics (CFD) simulation is chosen as the proxy model to generate more data for the neural network. The developed CFD model is validated with the experimental data (with less than 8% relative error) and enough data are then exported from it and added to the experimental data set to be used as input for the neural network. Finally, the network is used to predict the required correction factors. The feature parameters affecting the correction factors are also determined using sensitivity analysis. A new neural network developed using only those parameters predict the correction factors with even better accuracy. The semi-empirical equation modified by adding the correction factor can be implemented in separator design with high accuracy, leading to a considerable reduction in cost and time.
Sustainable development is one of the most important issues that can be considered from different... more Sustainable development is one of the most important issues that can be considered from different aspects and in different contexts including sustainable agriculture. This study aimed to investigate the main strategies related to sustainable development of rice production as an important agricultural product in Guilan Province using a SWOT analysis. To this end, different internal (strengths and weaknesses) and external (opportunities and threats) factors affecting rice production development were reviewed in the literature. Next, a questionnaire was designed based on the potential opportunities, threats, strengths and weaknesses in the literature and the initial interview of the experts; then, the experts were asked to determine the importance of factors on a five-point Likert type scale. The results showed that the rice production received the total scores of 2.14 and 2.24 for the External Factor Evaluation (EFE) matrix and the Internal Factor Evaluation (IFE) matrix, respectively...
The survival of the firms depends on the adoption of techniques and methods for encouraging learn... more The survival of the firms depends on the adoption of techniques and methods for encouraging learning among people. On other hand, it is necessary to have an attitude for interaction and endeavour in order for the learning to be built and conserved. Therefore, committed people in organizations have always been emphasized as a driving force of the extension and creation of learning. The aim of this study was to examine the impact of strategic learning practices on employees' commitment in small and medium-sized sized enterprises (SMEs) engaged in agriculture and protein food production sectors in Guilan Province. The statistical society was composed of 650 key people of SMEs in agriculture and food sector in Guilan Province. Stratified sampling method was applied. Tseng's standard questionnaire was used as main tool for data collection. The research is a practical study in terms of objective and a correlation-based descriptive studied in terms of data collection methodology. D...
Innovation is considered as a critical factor for organizations to create value and sustainable ... more Innovation is considered as a critical factor for organizations to create value and sustainable competitive advantage in today's complex and changing environment. Organizations with more innovation, in response to the changing environments and creating development of new capabilities that allows them to achieve better performance will be more successful. The aim of current study is to investigate the impact of organizational innovation through innovation capabilities in process and product on the performance of manufacturing firms in Rasht Industrial Town. This research paper is a kind of descriptive and correlation study. The statistical population includes all companies in the industrial city of Rasht (n = 157). Simple random sampling method has been applied, and SPSS 20 and warp pls5 software has been used in order to analyze acquired data. The results indicated that there is a positive relationship between organizational innovation and process innovation capabilit...
2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), 2017
This paper presents analysis and design of a new microstrip patch array antenna with reduced back... more This paper presents analysis and design of a new microstrip patch array antenna with reduced back radiation for secondary surveillance radar (SSR) application. This antenna fed by microstrip corporate feed network. Feed network for sum and difference beams with hybrid phase shifter and branch line coupler are implemented. Also a backfill antenna is designed and used to improve coverage of difference pattern in back of antenna. The effects of vital parameters on antenna performance and some other details are analyzed and discussed as well. The proposed antenna is designed on standard RO4003 substrate with 0.812 mm thickness. The fundamental parameters of the antenna such as bandwidth, return loss, gain, and radiation pattern are obtained. The antenna operates at frequencies of 1.03GHz and 1.09GHz with about 18dB gain. Beam width of sum pattern is 10.5° and 40° in azimuth and elevation plane, respectively. The proposed antenna has better 12 dB return loss at frequency range. Moreover,...
2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), 2017
This paper presents the implementation of a wide band VHF high power tubular band pass filter. Th... more This paper presents the implementation of a wide band VHF high power tubular band pass filter. The previous work of authors provides analysis and simulation approximations. Based on this research, design, simulation models and high power analysis done to achieve high power handling. The peak power in this filter is considered 10 kW. The experimental measurements show close agreement with the simulation results. This filter has 0.5 dB ripples, return loss better than 17 dB, and 1dB insertion loss in pass band. Moreover, the power handling capability of this filter is examined experimentally using DC and AC conditions. Dc test provides the level of break down detection and evaluates dielectric withstand. Ac test in high frequency high voltage situation is done using high-power transmitter in VHF band, a pulse duration of 10 μsec, duty cycle of 1%, and a peak power of 10 kW. Based on the results of these experiments, DC and AC tests demonstrate reliability of the pick power handling capability of the tubular filter structure. The proposed analysis and implementation of this filter have demonstrated it can handle extremely high peak power levels.
Today, brandisoneofthebasic elementsofthebusiness,an essentialand integral part ofthe marketing s... more Today, brandisoneofthebasic elementsofthebusiness,an essentialand integral part ofthe marketing strategy in the world economy, brands marketing is placed in the heart of the business and mostly, it‟s hiddenvalue resides within the hearts and minds of customers, clients, and prospects thatattracts them. Besides selling the products, establishing a lasting relationship between the product and certain group of customer‟s is the main purpose of each organization, the extraction of this stable interaction brings about a kind of commitment and customer loyalty toward the product. Brands with unique identity and targets, by providing tangible and friendly feature, are able to make a rich and beneficial relationship with customer‟s and not only capture a part of their heart and mind, but also capture a part of consumer‟s daily life. Therefore, the present study has been performed to examine the impact of brand identity on the development of customer loyalty toward the brand in the industry ...
Scientific Journal of Iran Blood Transfus Organ, 2019
Background and Objectives Mitochondrial biogenesis is a complex process involving the coordinated... more Background and Objectives Mitochondrial biogenesis is a complex process involving the coordinated expression of mitochondrial and nuclear genes, the import of the products of the latter into the organelle and turnover of this process. Mitochondrial malfunction or defects in any of the many pathways involved in mitochondrial biogenesis can lead to degenerative diseases and possibly play an important part in aging. Materials and Methods Because of the mitochondrial relationship with some factors such as matrix proteins, cell cycle and evolution, in this review article we examined the mitochondrial relationship with these factors and mechanisms. The data were extracted from NCBI and SID databases. Results Changes and mutations in mitochondria are common in most of the molecular processes and important diseases including cancer, but these mutations do not result in mitochondria deactivation. Investigating these pathways helps us to identify and treat diseases such as cancer. Conclusions...
Today, innovation is one of the main concerns of companies’ senior managers. In the new age, orga... more Today, innovation is one of the main concerns of companies’ senior managers. In the new age, organizations on the one hand should be equipped to innovation system in order to preserve their own existence, and on the other hand should adopt methods for production and supply of goods to make their goods and services accepted by the users. The purpose of this study is to determine the impact of individual differences (variety-seeking, risk aversion, and consumer product knowledge) on consumer adoption and attitudes towards innovation in electronic products. This research is applied in terms of objective, and descriptive-survey based on data collection method. The main data collection tool is questionnaire. The statistical population includes electronic products consumers in Rasht city, and using available non-probability sampling method, the sample includes 384 persons. Experts’ views are used to examine the validity of the questionnaire and Cronbach's alpha is used to examine its ...
Knowledge management literature emphasizes the importance of knowledge as a valuable asset for fi... more Knowledge management literature emphasizes the importance of knowledge as a valuable asset for firms. Although knowledge has been studied from several perspectives, this paper highlights the efficient sharing of knowledge as a way of creating core competencies in the firm. This perspective mainly focuses on the analysis of attributes that should provide the resources for generating a competitive advantage. We have two objectives. One is to examine that if a supplier's perceived payoff of sharing knowledge is contingent on the knowledge sharing behavior of other suppliers. The other objective is to analyze the perceived payoff of knowledge sharing and determine if it can be characterized by an archetypical game in the game theoretic model. An empirical study was conducted among nearly 124 suppliers in a local automotive supply chain (SAIPA Company, IRAN). The scope was confined to the supplier's willingness to share knowledge between other suppliers in SAIPA supply chain. The...
Intellectual capital is described as intangible assets that can be a source for sustainable compe... more Intellectual capital is described as intangible assets that can be a source for sustainable competitive advantage. Last researches have shown a meaningful and positive correlation between intellectual capital and organization performance and goal of this research is to strengthen these findings and research about the impact of intellectual capital(human capital, structural capital and relational capital (customer) on financial performance of Guilan Melli bank branches with profit factors, resource absorption ,allocating resources and debt collection Bonitess valid Psychometric questionnaire was used for doing this research after localizing and performing suitable changes about the effect of intellectual performance on bank’s financial performance. In order to examine for using in Iranian organizations , in this research for analysis of validity of questionnaire, confirmatory factor analysis and to examine reliability of questionnaire , Cronbach's alpha method were used that by t...
Organizational performance is a complex issue given that performance is a multifaceted phenomenon... more Organizational performance is a complex issue given that performance is a multifaceted phenomenon whose components may have distinct managerial priorities and may even be mutually inconsistent. Recently, the balanced scorecard approach (BSC), as an effective multi-criteria evaluation concept received much attention in organizational performance measurement. Although the BSC conceptual framework has been widely accepted in the business community, the proper method of implementing the framework remains an issue. Hence, this study has developed a hybrid expert system composition of BSC, Decision Making Trial and Evaluation Laboratory (DEMATEL) and fuzzy inference system (FIS) to evaluate the food producing companies. To this aim, this paper applied a graph theory based technique (DEMATEL) to determine critical criteria of BSC’s perspectives. The results show that “Profit”, “Customer satisfaction”, “Customer communication”, “Innovation management” and “Organizational asset management”, ...
Abstract In this study, various methods for multiphase flow metering were introduced. These techn... more Abstract In this study, various methods for multiphase flow metering were introduced. These techniques include measurement of gas-liquid average density by a Coriolis flow meter and determining the gas volume fraction by discharge coefficient of an orifice plate. Application of Orifice plate and Coriolis flow meters were investigated for gas-liquid flow metering. The principle of using these instruments as single-phase flow meters, for measurement of the two-phase flow was not focused in previous studies. In the second part, gas volume fraction was predicted by a soft sensor. Variation of Coriolis meter factor with gas volume fraction and Reynolds number was studied. Moreover, changes of pressure drop and discharge coefficient of Orifice with Reynolds number was investigated. On the other hand, 250 data sets were collected to develop a soft sensor using 2-layer and 3-layer neural networks optimized by genetic algorithm and Least Square Support Vector Machine. Increasing Reynolds number led to decrease in Coriolis meter factor. Among various computational intelligence methods, 3-layer neural network was the best, with mean square error and mean absolute percent error of 0.91% and 3%, respectively and computation time of 0.0001 s.
This paper presents an efficient method to redesign a horn-fed, double-curvature reflector antenn... more This paper presents an efficient method to redesign a horn-fed, double-curvature reflector antenna. It helps reconstruct or repair the reflector according to a correct reference or analyze its radiation characteristics through full-wave electromagnetic simulations. The proposed method mainly consists of five stages. At first, it is necessary to obtain initial data in the form of three-dimensional coordinates of a sufficient number of points sampled from the reflector's different surface areas, especially from its central section curve and its peripheral contour. Then, the best-fitting surface to the sampled points is found using geometrical-optics (GO)-based formulations in an invasive weed optimization (IWO) algorithm. The GO relations extend the reflector laterally using elevation angle, horizontal, or focal point strips. As these are intrinsic formulations for designing doubly-curved reflectors, the fitted surface can resolve the possible defects in the reference reflector's geometry or inaccuracies in the sampled information partly. For this purpose, the reflector's central section curve is estimated by fitting a fifth-degree polynomial curve to the data sampled from it. Also, two kinds of errors, which are based on Euclidean distances, define the optimization algorithm cost function for more reliable surface fitting. In the third stage, the fitted surface's peripheral contour is adjusted to match the outline of the reference reflector using the points sampled from this section. In stage four, the redesigned reflector in the form of a point cloud is converted to a .stl file format for further simulation in a fullwave electromagnetic software. Finally, the similarity between the redesigned and reference reflectors' radiation patterns is examined using a radiation-based cost function in an iterative process, and the previously devised four stages repeat until appropriate results are obtained. In particular, an already designed and fabricated UHF band, doubly-curved reflector antenna, capable of generating a cosecantsquared radiation pattern in the elevation plane and narrow in the azimuth, is redesigned using 99 points sampled from it. It is found that horizontal strips can best fit the reflector with the small normalized error about 3 mm at the end of the IWO algorithm, indicating a nearly perfect geometrical similarity between the redesigned and reference reflectors. For further verification of the suggested method, the redesigned reflector's radiation pattern is simulated in CST simulation software, and the results are compared with the measured radiation pattern of the fabricated reflector and the simulated radiation pattern of the antenna's initial CAD model in the azimuth and elevation planes. Specifically for the redesigned antenna, the amounts of HPBW and sidelobe level in the azimuth plane are about 2.6 • and 29.85 dB, respectively. Also, the amounts of gain, HPBW, and predefined parameters of α and β in the elevation plane are 28.25 dB, 13.5 • , 5.07 dB, and 11.7 • , respectively. All of the measured and simulated results are in good correspondence with each other, suggesting that the proposed method is a secure solution for redesigning double-curvature reflector antennas precisely and efficiently.
The high accumulation of lipid droplets in the cell is related to metabolic disorders, such as ob... more The high accumulation of lipid droplets in the cell is related to metabolic disorders, such as obesity. Perilipin 5 (Plin5), plays an important role in triglyceride hydrolysis in the lipid droplets. In this study, this protein has been evaluated in different tissues and conditions in mice. Fifty male mice were divided into 5 groups and treated for 45 days with Resveratrol, Metformin, strength training, and 4°C cold. Brown adipose tissue (BAT), gastrocnemius skeletal muscle and heart were isolated for RNA extraction. The Plin5 gene expression was evaluated, using Real-Time PCR, and the plin5 was analyzed at the protein level, using western blot. In BAT, Resveratrol significantly reduced the plin5 protein level and gene expression (p < 0.05). In heart tissue, Resveratrol and strength training, decreased (p < 0.05) the plin5 expression, but Metformin increased the gene expression (p < 0.05). In skeletal muscle, resveratrol, strength training, cold and Metformin significantly increased the plin5 expression at the gene and protein level (p < 0.05). In BAT, Resveratrol has a greater effect in decreasing lipid deposits, compared with the strength training and cold; thus, it can play a better role in preventing lipid accumulation. In heart tissue, Resveratrol probably decreases insulin resistance, due to the increased expression of plin5 in skeletal muscle.
ABSTRACT This article has attempted to examine the impact of motivation on the purchasing and rep... more ABSTRACT This article has attempted to examine the impact of motivation on the purchasing and represents a model for organic or local cucumbers buying dimensions. Data were collected by a sample of 300 people in two northern provinces of Iran during 7 months and were tested using structural equation modeling (SEM) technique. Results indicate that not using pesticides, preserving people’s health, conservation, better taste, and region of origin of organic or local cucumbers have significant positive impacts on purchasing dimensions and persistence has no significant effect on purchasing dimensions.
11th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2005], 2005
Fractal geometry has been developed within the last quarter century for understanding geometries ... more Fractal geometry has been developed within the last quarter century for understanding geometries that cannot be easily defined by Euclidian geometry. Fractal geometry encompasses an iterative methodology for defining structures. A simple geometrical transformation is performed on a starting structure and the result is fed back into this same transformation many times.
The aim of this research is to investigate the role of ethical leadership on employee's performan... more The aim of this research is to investigate the role of ethical leadership on employee's performance in Rasht University of Medical Sciences. The research method in this study is descriptive-correlation and based on the objective, it is an applied research. The statistical population of this research consisted of all employees of the University of Medical Sciences in the city of Rasht, which the number of sample size was determined 337 employees by the available non-probability sampling method. In order to collect data standard questionnaire was used, and finally 349 questionnaires were analyzed. In the inferential statistics, the Kolmogorov-Smirnov test was used to investigate the normality of data distribution. With regard to the normality of data distribution, in order to investigate the hypotheses, the parametric tests of Pearson correlation and hierarchical regression in SPSS software were used. In order to test the fitness of research model and investigating all relationships, the structural equation modeling in LISREL software was used. The research results showed that the role of ethical leadership in the performance of employees is indirectly significant and all hypotheses were confirmed.
Abstract Separators play a critical role in oil and gas industry by separating well outflows into... more Abstract Separators play a critical role in oil and gas industry by separating well outflows into natural gas, oil and/or water. A common method to design separators is using semi-empirical correlations. However, separator design is a complicated procedure and these correlations include several simplifying assumptions. Hence, evaluating their capability to design separators is necessary. In this study, a pilot two-phase separation unit is designed and constructed to examine the reliability of a selected correlation. The unit consists of a laboratory-scale horizontal two-phase separator, pumps and compressors to pressurize liquid and gas flows, a static mixer to create a two-phase flow, and a liquid filter. The experimental results from the unit show that the correlation could be modified to yield more accurate results. Therefore, including a correction factor into the correlation to reduce the error between the experimental and theoretical results is necessary. The experiments also show that the correction factor is not a constant value and depends on several parameters. Some of these parameters are gas flow rate, liquid density, liquid droplet diameter, drag coefficient, separator diameter, etc. Conducting experiments using the separation unit is time-consuming and costly. In addition, the sensitivity analysis required to develop a correlation between the correction factor and the parameters affecting it is not experimentally possible for some of the parameters. Thus, an artificial neural network is used to predict the correction factor and conduct sensitivity analysis. Because of the reasons mentioned above, obtaining enough experimental data to be used as input for the network is not possible. Therefore, computational fluid dynamics (CFD) simulation is chosen as the proxy model to generate more data for the neural network. The developed CFD model is validated with the experimental data (with less than 8% relative error) and enough data are then exported from it and added to the experimental data set to be used as input for the neural network. Finally, the network is used to predict the required correction factors. The feature parameters affecting the correction factors are also determined using sensitivity analysis. A new neural network developed using only those parameters predict the correction factors with even better accuracy. The semi-empirical equation modified by adding the correction factor can be implemented in separator design with high accuracy, leading to a considerable reduction in cost and time.
Sustainable development is one of the most important issues that can be considered from different... more Sustainable development is one of the most important issues that can be considered from different aspects and in different contexts including sustainable agriculture. This study aimed to investigate the main strategies related to sustainable development of rice production as an important agricultural product in Guilan Province using a SWOT analysis. To this end, different internal (strengths and weaknesses) and external (opportunities and threats) factors affecting rice production development were reviewed in the literature. Next, a questionnaire was designed based on the potential opportunities, threats, strengths and weaknesses in the literature and the initial interview of the experts; then, the experts were asked to determine the importance of factors on a five-point Likert type scale. The results showed that the rice production received the total scores of 2.14 and 2.24 for the External Factor Evaluation (EFE) matrix and the Internal Factor Evaluation (IFE) matrix, respectively...
The survival of the firms depends on the adoption of techniques and methods for encouraging learn... more The survival of the firms depends on the adoption of techniques and methods for encouraging learning among people. On other hand, it is necessary to have an attitude for interaction and endeavour in order for the learning to be built and conserved. Therefore, committed people in organizations have always been emphasized as a driving force of the extension and creation of learning. The aim of this study was to examine the impact of strategic learning practices on employees' commitment in small and medium-sized sized enterprises (SMEs) engaged in agriculture and protein food production sectors in Guilan Province. The statistical society was composed of 650 key people of SMEs in agriculture and food sector in Guilan Province. Stratified sampling method was applied. Tseng's standard questionnaire was used as main tool for data collection. The research is a practical study in terms of objective and a correlation-based descriptive studied in terms of data collection methodology. D...
Innovation is considered as a critical factor for organizations to create value and sustainable ... more Innovation is considered as a critical factor for organizations to create value and sustainable competitive advantage in today's complex and changing environment. Organizations with more innovation, in response to the changing environments and creating development of new capabilities that allows them to achieve better performance will be more successful. The aim of current study is to investigate the impact of organizational innovation through innovation capabilities in process and product on the performance of manufacturing firms in Rasht Industrial Town. This research paper is a kind of descriptive and correlation study. The statistical population includes all companies in the industrial city of Rasht (n = 157). Simple random sampling method has been applied, and SPSS 20 and warp pls5 software has been used in order to analyze acquired data. The results indicated that there is a positive relationship between organizational innovation and process innovation capabilit...
2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), 2017
This paper presents analysis and design of a new microstrip patch array antenna with reduced back... more This paper presents analysis and design of a new microstrip patch array antenna with reduced back radiation for secondary surveillance radar (SSR) application. This antenna fed by microstrip corporate feed network. Feed network for sum and difference beams with hybrid phase shifter and branch line coupler are implemented. Also a backfill antenna is designed and used to improve coverage of difference pattern in back of antenna. The effects of vital parameters on antenna performance and some other details are analyzed and discussed as well. The proposed antenna is designed on standard RO4003 substrate with 0.812 mm thickness. The fundamental parameters of the antenna such as bandwidth, return loss, gain, and radiation pattern are obtained. The antenna operates at frequencies of 1.03GHz and 1.09GHz with about 18dB gain. Beam width of sum pattern is 10.5° and 40° in azimuth and elevation plane, respectively. The proposed antenna has better 12 dB return loss at frequency range. Moreover,...
2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), 2017
This paper presents the implementation of a wide band VHF high power tubular band pass filter. Th... more This paper presents the implementation of a wide band VHF high power tubular band pass filter. The previous work of authors provides analysis and simulation approximations. Based on this research, design, simulation models and high power analysis done to achieve high power handling. The peak power in this filter is considered 10 kW. The experimental measurements show close agreement with the simulation results. This filter has 0.5 dB ripples, return loss better than 17 dB, and 1dB insertion loss in pass band. Moreover, the power handling capability of this filter is examined experimentally using DC and AC conditions. Dc test provides the level of break down detection and evaluates dielectric withstand. Ac test in high frequency high voltage situation is done using high-power transmitter in VHF band, a pulse duration of 10 μsec, duty cycle of 1%, and a peak power of 10 kW. Based on the results of these experiments, DC and AC tests demonstrate reliability of the pick power handling capability of the tubular filter structure. The proposed analysis and implementation of this filter have demonstrated it can handle extremely high peak power levels.
Today, brandisoneofthebasic elementsofthebusiness,an essentialand integral part ofthe marketing s... more Today, brandisoneofthebasic elementsofthebusiness,an essentialand integral part ofthe marketing strategy in the world economy, brands marketing is placed in the heart of the business and mostly, it‟s hiddenvalue resides within the hearts and minds of customers, clients, and prospects thatattracts them. Besides selling the products, establishing a lasting relationship between the product and certain group of customer‟s is the main purpose of each organization, the extraction of this stable interaction brings about a kind of commitment and customer loyalty toward the product. Brands with unique identity and targets, by providing tangible and friendly feature, are able to make a rich and beneficial relationship with customer‟s and not only capture a part of their heart and mind, but also capture a part of consumer‟s daily life. Therefore, the present study has been performed to examine the impact of brand identity on the development of customer loyalty toward the brand in the industry ...
Scientific Journal of Iran Blood Transfus Organ, 2019
Background and Objectives Mitochondrial biogenesis is a complex process involving the coordinated... more Background and Objectives Mitochondrial biogenesis is a complex process involving the coordinated expression of mitochondrial and nuclear genes, the import of the products of the latter into the organelle and turnover of this process. Mitochondrial malfunction or defects in any of the many pathways involved in mitochondrial biogenesis can lead to degenerative diseases and possibly play an important part in aging. Materials and Methods Because of the mitochondrial relationship with some factors such as matrix proteins, cell cycle and evolution, in this review article we examined the mitochondrial relationship with these factors and mechanisms. The data were extracted from NCBI and SID databases. Results Changes and mutations in mitochondria are common in most of the molecular processes and important diseases including cancer, but these mutations do not result in mitochondria deactivation. Investigating these pathways helps us to identify and treat diseases such as cancer. Conclusions...
Today, innovation is one of the main concerns of companies’ senior managers. In the new age, orga... more Today, innovation is one of the main concerns of companies’ senior managers. In the new age, organizations on the one hand should be equipped to innovation system in order to preserve their own existence, and on the other hand should adopt methods for production and supply of goods to make their goods and services accepted by the users. The purpose of this study is to determine the impact of individual differences (variety-seeking, risk aversion, and consumer product knowledge) on consumer adoption and attitudes towards innovation in electronic products. This research is applied in terms of objective, and descriptive-survey based on data collection method. The main data collection tool is questionnaire. The statistical population includes electronic products consumers in Rasht city, and using available non-probability sampling method, the sample includes 384 persons. Experts’ views are used to examine the validity of the questionnaire and Cronbach's alpha is used to examine its ...
Knowledge management literature emphasizes the importance of knowledge as a valuable asset for fi... more Knowledge management literature emphasizes the importance of knowledge as a valuable asset for firms. Although knowledge has been studied from several perspectives, this paper highlights the efficient sharing of knowledge as a way of creating core competencies in the firm. This perspective mainly focuses on the analysis of attributes that should provide the resources for generating a competitive advantage. We have two objectives. One is to examine that if a supplier's perceived payoff of sharing knowledge is contingent on the knowledge sharing behavior of other suppliers. The other objective is to analyze the perceived payoff of knowledge sharing and determine if it can be characterized by an archetypical game in the game theoretic model. An empirical study was conducted among nearly 124 suppliers in a local automotive supply chain (SAIPA Company, IRAN). The scope was confined to the supplier's willingness to share knowledge between other suppliers in SAIPA supply chain. The...
Intellectual capital is described as intangible assets that can be a source for sustainable compe... more Intellectual capital is described as intangible assets that can be a source for sustainable competitive advantage. Last researches have shown a meaningful and positive correlation between intellectual capital and organization performance and goal of this research is to strengthen these findings and research about the impact of intellectual capital(human capital, structural capital and relational capital (customer) on financial performance of Guilan Melli bank branches with profit factors, resource absorption ,allocating resources and debt collection Bonitess valid Psychometric questionnaire was used for doing this research after localizing and performing suitable changes about the effect of intellectual performance on bank’s financial performance. In order to examine for using in Iranian organizations , in this research for analysis of validity of questionnaire, confirmatory factor analysis and to examine reliability of questionnaire , Cronbach's alpha method were used that by t...
Organizational performance is a complex issue given that performance is a multifaceted phenomenon... more Organizational performance is a complex issue given that performance is a multifaceted phenomenon whose components may have distinct managerial priorities and may even be mutually inconsistent. Recently, the balanced scorecard approach (BSC), as an effective multi-criteria evaluation concept received much attention in organizational performance measurement. Although the BSC conceptual framework has been widely accepted in the business community, the proper method of implementing the framework remains an issue. Hence, this study has developed a hybrid expert system composition of BSC, Decision Making Trial and Evaluation Laboratory (DEMATEL) and fuzzy inference system (FIS) to evaluate the food producing companies. To this aim, this paper applied a graph theory based technique (DEMATEL) to determine critical criteria of BSC’s perspectives. The results show that “Profit”, “Customer satisfaction”, “Customer communication”, “Innovation management” and “Organizational asset management”, ...
Abstract In this study, various methods for multiphase flow metering were introduced. These techn... more Abstract In this study, various methods for multiphase flow metering were introduced. These techniques include measurement of gas-liquid average density by a Coriolis flow meter and determining the gas volume fraction by discharge coefficient of an orifice plate. Application of Orifice plate and Coriolis flow meters were investigated for gas-liquid flow metering. The principle of using these instruments as single-phase flow meters, for measurement of the two-phase flow was not focused in previous studies. In the second part, gas volume fraction was predicted by a soft sensor. Variation of Coriolis meter factor with gas volume fraction and Reynolds number was studied. Moreover, changes of pressure drop and discharge coefficient of Orifice with Reynolds number was investigated. On the other hand, 250 data sets were collected to develop a soft sensor using 2-layer and 3-layer neural networks optimized by genetic algorithm and Least Square Support Vector Machine. Increasing Reynolds number led to decrease in Coriolis meter factor. Among various computational intelligence methods, 3-layer neural network was the best, with mean square error and mean absolute percent error of 0.91% and 3%, respectively and computation time of 0.0001 s.
This paper presents an efficient method to redesign a horn-fed, double-curvature reflector antenn... more This paper presents an efficient method to redesign a horn-fed, double-curvature reflector antenna. It helps reconstruct or repair the reflector according to a correct reference or analyze its radiation characteristics through full-wave electromagnetic simulations. The proposed method mainly consists of five stages. At first, it is necessary to obtain initial data in the form of three-dimensional coordinates of a sufficient number of points sampled from the reflector's different surface areas, especially from its central section curve and its peripheral contour. Then, the best-fitting surface to the sampled points is found using geometrical-optics (GO)-based formulations in an invasive weed optimization (IWO) algorithm. The GO relations extend the reflector laterally using elevation angle, horizontal, or focal point strips. As these are intrinsic formulations for designing doubly-curved reflectors, the fitted surface can resolve the possible defects in the reference reflector's geometry or inaccuracies in the sampled information partly. For this purpose, the reflector's central section curve is estimated by fitting a fifth-degree polynomial curve to the data sampled from it. Also, two kinds of errors, which are based on Euclidean distances, define the optimization algorithm cost function for more reliable surface fitting. In the third stage, the fitted surface's peripheral contour is adjusted to match the outline of the reference reflector using the points sampled from this section. In stage four, the redesigned reflector in the form of a point cloud is converted to a .stl file format for further simulation in a fullwave electromagnetic software. Finally, the similarity between the redesigned and reference reflectors' radiation patterns is examined using a radiation-based cost function in an iterative process, and the previously devised four stages repeat until appropriate results are obtained. In particular, an already designed and fabricated UHF band, doubly-curved reflector antenna, capable of generating a cosecantsquared radiation pattern in the elevation plane and narrow in the azimuth, is redesigned using 99 points sampled from it. It is found that horizontal strips can best fit the reflector with the small normalized error about 3 mm at the end of the IWO algorithm, indicating a nearly perfect geometrical similarity between the redesigned and reference reflectors. For further verification of the suggested method, the redesigned reflector's radiation pattern is simulated in CST simulation software, and the results are compared with the measured radiation pattern of the fabricated reflector and the simulated radiation pattern of the antenna's initial CAD model in the azimuth and elevation planes. Specifically for the redesigned antenna, the amounts of HPBW and sidelobe level in the azimuth plane are about 2.6 • and 29.85 dB, respectively. Also, the amounts of gain, HPBW, and predefined parameters of α and β in the elevation plane are 28.25 dB, 13.5 • , 5.07 dB, and 11.7 • , respectively. All of the measured and simulated results are in good correspondence with each other, suggesting that the proposed method is a secure solution for redesigning double-curvature reflector antennas precisely and efficiently.
The high accumulation of lipid droplets in the cell is related to metabolic disorders, such as ob... more The high accumulation of lipid droplets in the cell is related to metabolic disorders, such as obesity. Perilipin 5 (Plin5), plays an important role in triglyceride hydrolysis in the lipid droplets. In this study, this protein has been evaluated in different tissues and conditions in mice. Fifty male mice were divided into 5 groups and treated for 45 days with Resveratrol, Metformin, strength training, and 4°C cold. Brown adipose tissue (BAT), gastrocnemius skeletal muscle and heart were isolated for RNA extraction. The Plin5 gene expression was evaluated, using Real-Time PCR, and the plin5 was analyzed at the protein level, using western blot. In BAT, Resveratrol significantly reduced the plin5 protein level and gene expression (p < 0.05). In heart tissue, Resveratrol and strength training, decreased (p < 0.05) the plin5 expression, but Metformin increased the gene expression (p < 0.05). In skeletal muscle, resveratrol, strength training, cold and Metformin significantly increased the plin5 expression at the gene and protein level (p < 0.05). In BAT, Resveratrol has a greater effect in decreasing lipid deposits, compared with the strength training and cold; thus, it can play a better role in preventing lipid accumulation. In heart tissue, Resveratrol probably decreases insulin resistance, due to the increased expression of plin5 in skeletal muscle.
ABSTRACT This article has attempted to examine the impact of motivation on the purchasing and rep... more ABSTRACT This article has attempted to examine the impact of motivation on the purchasing and represents a model for organic or local cucumbers buying dimensions. Data were collected by a sample of 300 people in two northern provinces of Iran during 7 months and were tested using structural equation modeling (SEM) technique. Results indicate that not using pesticides, preserving people’s health, conservation, better taste, and region of origin of organic or local cucumbers have significant positive impacts on purchasing dimensions and persistence has no significant effect on purchasing dimensions.
11th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2005], 2005
Fractal geometry has been developed within the last quarter century for understanding geometries ... more Fractal geometry has been developed within the last quarter century for understanding geometries that cannot be easily defined by Euclidian geometry. Fractal geometry encompasses an iterative methodology for defining structures. A simple geometrical transformation is performed on a starting structure and the result is fed back into this same transformation many times.
The aim of this research is to investigate the role of ethical leadership on employee's performan... more The aim of this research is to investigate the role of ethical leadership on employee's performance in Rasht University of Medical Sciences. The research method in this study is descriptive-correlation and based on the objective, it is an applied research. The statistical population of this research consisted of all employees of the University of Medical Sciences in the city of Rasht, which the number of sample size was determined 337 employees by the available non-probability sampling method. In order to collect data standard questionnaire was used, and finally 349 questionnaires were analyzed. In the inferential statistics, the Kolmogorov-Smirnov test was used to investigate the normality of data distribution. With regard to the normality of data distribution, in order to investigate the hypotheses, the parametric tests of Pearson correlation and hierarchical regression in SPSS software were used. In order to test the fitness of research model and investigating all relationships, the structural equation modeling in LISREL software was used. The research results showed that the role of ethical leadership in the performance of employees is indirectly significant and all hypotheses were confirmed.
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