Development of in-plane models for the analysis of dead-ended and anode bleeding operation modes and the cell degradation with carbon corrosion

Low durability and high cost are main drawbacks against commercialization of the proton exchange membrane fuel cell (PEMFC). The anode-bleeding (AB) operation mode offers a very high hydrogen utilization and cost reduction by eliminating additional components for the recovery of hydrogen in the flow-through mode and avoids the carbon corrosion reaction (CCR), which causes degradation of the catalyst layer and occurs typically when the bleeding rate is set to zero in the dead-ended (DEA) mode. Three-dimensional (3D) models are necessary for the analysis of PEMFCs. However, computational cost of 3D models is extremely high because of the strong nonlinearity due to complex interactions in the cell. In this dissertation, a pseudo-three-dimensional (P3D) two-phase and non-isothermal model is developed to reduce the computational cost and predict the cell performance with high accuracy. Results demonstrate that the P3D model results compare very well with ones from 3D model and experimental data from the literature. The P3D model is used to investigate the effects of geometric and operation parameters on the cell performance under DEA and AB operation modes. Moreover, the bleeding rate is optimized to sustain a stable transient cell voltage without the CCR in the cathode catalyst layer (CCL) while hydrogen utilization is kept at more than 99%. Furthermore, effects of the anode flow field design on the cell performance under the AB operation mode are investigated. Lastly, the P3D model is used to study effects of cell degradation on transport properties of the CC

Evaluation of effects of deployment automation system on integrated automation system office and financial: A case study in Municipality of Qazvin and affiliated organizations

Today, the era of wonderful knowledge, technology and innovation is incredible. With the rapid public access to computers and information technology and advanced media in twenty First Century, economy has no proper electronic infrastructure to handle. One of the most important factors in deciding the top and middle managers is information. Having a detailed, accurate, timely, in all subjects, and institutional department will speed up decision-making and prevent the adoption of wrong decisions. Office and financial automation is one of the most important tools to achieve effective solutions to save time, respond quickly to customers and reduce the costs of the organization through appropriate decisions. The main objective of the present study is investigation of the establishment of a comprehensive system of office and financial on the quality of managers making decision in municipality of Qazvin and affiliated organizations. The study by descriptive - survey method was conducted and 60 managers and Officers based on Morgan table and Cohen by judgmental and selective sampling were selected as samples. The instrument used in this study included interviews with a number of specialists of organizations, and provided a standard questionnaire of Office automation which examines the seven factors of accuracy, precision, speed, timely, economic performance and compares them with other similar systems. Questionnaire validity was approved by using experts and scholars ideas and its reliability by Cronbach's alpha calculation. The collected data were analyzed using a one-sample t-test and were prioritized using the Friedman test. The results of the study indicated that in general, the establishment of Office and financial comprehensive automation systems has a positive impact on the quality of management decision making

Evaluation of effects of deployment automation system on integrated automation system office and financial: A case study in Municipality of Qazvin and affiliated organizations

Today, the era of wonderful knowledge, technology and innovation is incredible. With the rapid public access to computers and information technology and advanced media in twenty First Century, economy has no proper electronic infrastructure to handle. One of the most important factors in deciding the top and middle managers is information. Having a detailed, accurate, timely, in all subjects, and institutional department will speed up decision-making and prevent the adoption of wrong decisions. Office and financial automation is one of the most important tools to achieve effective solutions to save time, respond quickly to customers and reduce the costs of the organization through appropriate decisions. The main objective of the present study is investigation of the establishment of a comprehensive system of office and financial on the quality of managers making decision in municipality of Qazvin and affiliated organizations. The study by descriptive - survey method was conducted and 60 managers and Officers based on Morgan table and Cohen by judgmental and selective sampling were selected as samples. The instrument used in this study included interviews with a number of specialists of organizations, and provided a standard questionnaire of Office automation which examines the seven factors of accuracy, precision, speed, timely, economic performance and compares them with other similar systems. Questionnaire validity was approved by using experts and scholars ideas and its reliability by Cronbach's alpha calculation. The collected data were analyzed using a one-sample t-test and were prioritized using the Friedman test. The results of the study indicated that in general, the establishment of Office and financial comprehensive automation systems has a positive impact on the quality of management decision making

Effects of PEM fuel cell degradation on the transport properties of the cathode catalyst layer

Durability is a major issue against the commercialization of proton exchange membrane fuel cells (PEMFC). Several mechanisms play an important role in the degradation of the cathode catalyst layer (CCL) by deteriorating the transport properties of reactants in the CCL mainly. A pseudo three-dimensional (P3D), two-phase, and non-isothermal model is used to study the effects of cell degradation on the transport properties of the CCL. Accuracy of the model is verified by comparing the polarization curves from the model with the experimental ones reported in the literature. The model is used to investigate the effects of CCL transport properties and agglomerate parameters on cell performance. Results demonstrate that the cell performance is improved for thinner ionomer film around agglomerates, smaller agglomerates, higher exchange current density, lower transport resistance and higher proton conductivity of the CCL. The transport parameters of the CCL are varied to fit the polarization curves to the experimental ones for an accelerated stress test. It is found that the transport resistances increase exponentially with the carbon loss in the CCL

Análisis del efecto de la inteligencia emocional de estudiantes y entrenadores en el rendimiento académico con mediación del éxito deportivo

This research aims to study the effect of students’ and coaches’ emotional intelligence (EI) on academic achievement (AA) with mediation of sport success (SS). This is a causative research and it is applied research in terms of the purpose. The population consists of second grade students and their coaches. For sampling, 33 sport teams were identified that had 347 second grade students, and the research questionnaires were distributed among them. The results showed that EI of students and coaches have significant effect on SS. In addition, students’ EI have a significant effect on AA. Also, the EI of students and coaches have indirect effect on AA through SS. Finally, considering the importance of EI, coaches and students should perceive the EI functions and aspects to utilize it in different situation.La presente investigación tiene como objetivo estudiar el efecto de la inteligencia emocional (IE) de los estudiantes y entrenadores en el rendimiento académico (RA) con la mediación del éxito deportivo (ED). Esta es una investigación causal y es investigación aplicada en términos del propósito. La población está compuesta por estudiantes de segundo grado y sus entrenadores. Para el muestreo, se identificaron 33 equipos deportivos que tenían 347 estudiantes de segundo grado, y los cuestionarios de investigación se distribuyeron entre ellos. Los resultados mostraron que la IE de los estudiantes y entrenadores tiene un efecto significativo en el ED. Además, la IE de los estudiantes tiene un efecto significativo en el RA. Además, la IE de estudiantes y entrenadores tiene un efecto indirecto en el RA a través de ED. Finalmente, considerando la importancia de la IE, los entrenadores y los estudiantes deben percibir las funciones y aspectos de la IE para utilizarla en diferentes situaciones