Design of Gallium Phosphate Surface Acoustic Wave Resonator Using Finite Element Method

The research into Surface Acoustic Wave (SAW) devices began in the early 1970s and led to the development of high performance, small size, rigorous and high reproducibility devices. SAW devices have been recognized for their versatility and efficiency in controlling and processing of electrical signals. Much research has now been done on the application of such devices to consumer electronic, communication systems and process function, such as delay lines, filters, resonator, and pulse compressors. The use of novel material, such as Gallium phosphate (GaPO4), extends the operating temperature of the SAW elements. In this thesis SAW devices based on this new material, operating at resonance frequency of 433.92 MHz been studied for passive wireless application. The SAW devices consist of interdigital transducer (IDT) with 1.4 μm finger gap ratio of 1:1 of platinum and under-layer of chromium metallization. A modeling using lumped equivalent circuit (LEC) of the device and finite element modeling (FEM) was done. The frequency responses of device were simulated by Sparameter and impedance. The impedance was used to study the mass loading effect of the Platinum electrodes of the SAW devices. The analysis of the result shows that the mass loading affects the resonant frequency of the SAW device. Furthermore, the results show that FEM approach is more precise than LEC for design and simulation of SAW resonator

Language Learner Autonomy in Ontario\u27s ESL Context

Since its emergence in the early 1980’s, the notion of learner autonomy has not only become a buzzword in second language education literature but a revolutionary phenomenon affecting teaching/learning approaches across the world. A great number of countries have adopted measures to promote learner autonomy in their language schools. In Europe, for instance, the Council of Europe developed the Common European Framework of Reference for Languages (CEFR) and the European Language Portfolio (ELP) with the explicit goal of developing language learner autonomy (Little, 2007). In Canada, following the introduction of Manitoba Collaborative Language Portfolio Assessment (CLPA), very recently Portfolio-Based Language Assessment (PBLA) has been introduced and gradually implemented in government-funded ESL programs across the country (Pettis, 2014) to realize the same goal. Given its importance, this study investigated the present status of the promotion of language learner autonomy in Ontario’s ESL context. To this end, through a mixed methods research design using interviews and surveys, the study explored the perceptions of ESL teacher trainers, ESL instructors, and ESL learners. Based on David Little’s comprehensive theory of language learner autonomy (2009), the study presents a thorough understanding of participants’ perceptions of the construct of learner autonomy, desirability, feasibility, and challenges of promoting learner autonomy, its contribution to second language learning and teachers’ roles in the context. The study furthers delves into the perceptions of introduction, and implementation of PBLA and discusses its shortcomings and advantages. It further suggests implications for practice regarding the promotion of language learner autonomy

FACTORS AFFECTING THE VALUE OF BANK SHARES IN TEHRAN STOCK EXCHANGE

Growth opportunities for investments form an important part of the bank's value. When investors determine value of the bank according to the bank's accounting report, it is necessary to consider the bank's expectations for growth investments. With the development of capital markets has been more pronounced role of performance measures at reflecting in the performance of banks through their existing content. Identify economic and financial accounting factors which influence from different directions on the value of bank shares are effective in creating positive conditions for increasing investment and financial credit absorption of bank. Taking into account the stated conditions, the purpose of this investigation is to investigate factors affecting the value of bank stocks. Needed data for research are collected from 25 active banks in Tehran Stock Exchange during 2008-2014. The data are analyzed using Excel, SPSS and E-views soft wares. Im, Pesaran, and Shin test is used to evaluate the reliability of variables, then F-Limer fitness tests and Hausman are reported and finally regression model corresponding to the research questions is fitted. Obtained results show that bank size, bank performance, inflation rate and bank credit risk have impact on market value of bank shares.JEL: D53, E31, G32  Article visualizations

Modeling of Traceability Information System for Material Flow Control Data.

This paper focuses on data modeling for traceability of material/work flow in information layer of manufacturing control system. The model is able to trace all associated data throughout the product manufacturing from order to final product. Dynamic data processing of Quality and Purchase activities are considered in data modeling as well as Order and Operation base on lots particulars. The modeling consisted of four steps and integrated as one final model. Entity-Relationships Modeling as data modeling methodology is proposed. The model is reengineered with Toad Data Modeler software in physical modeling step. The developed model promises to handle fundamental issues of a traceability system effectively. It supports for customization and real-time control of material in flow in all levels of manufacturing processes. Through enhanced visibility and dynamic store/retrieval of data, all traceability usages and applications is responded. Designed solution is initially applicable as reference data model in identical lot-base traceability system

Dealing with uncertain entities in ontology alignment using rough sets

This is the author's accepted manuscript. The final published article is available from the link below. Copyright @ 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.Ontology alignment facilitates exchange of knowledge among heterogeneous data sources. Many approaches to ontology alignment use multiple similarity measures to map entities between ontologies. However, it remains a key challenge in dealing with uncertain entities for which the employed ontology alignment measures produce conflicting results on similarity of the mapped entities. This paper presents OARS, a rough-set based approach to ontology alignment which achieves a high degree of accuracy in situations where uncertainty arises because of the conflicting results generated by different similarity measures. OARS employs a combinational approach and considers both lexical and structural similarity measures. OARS is extensively evaluated with the benchmark ontologies of the ontology alignment evaluation initiative (OAEI) 2010, and performs best in the aspect of recall in comparison with a number of alignment systems while generating a comparable performance in precision

The effect of infliximab on oxidative stress after myocardial infarction in rats

Infliximab is a human mouse human chimeric IgG1 antibody that includes human stable regions and variable mouse regions that have inhibitory effects on TNFα, and has recently been used to treat Crohn's disease, urticaria colitis, rheumatoid arthritis, and psoriatic arthritis. This study was conducted to determine the effect of TNFα inhibition on infectious stress and serum lactate levels in infants after isoproterenol induced myocardial infarction in rats. Methods and Results: For induction of myocardial infarction (MI), isoproterenol (100 mg/kg) was injected subcutaneously in a 24-hour saline solution in normal saline for 24 days. Animals after 24, 48, 72 and 96 hours after the second dose of isoproterenol was surgically treated. After infusion of inflections, 24, 48, 72 and 96 hours of surgery were performed. Anesthesia for animal surgery with ketamine and xylazine (3 to 2. Blood samples were collected from the hepatic vein and serum was used after the isolation to measure biochemical factors. At the end of the test, the heart was quickly separated and washed with normal cold saline and water was taken and weighed. Induced infarction with isoproterenol 100 mg/kg changes the pattern and parameters of electrocardiography and hemodynamics, and also causes hypertrophy, necrosis, edema and severe cardiac inflammation. Injection of infliximab at a dose of 7 mg/kg in the mentioned intervals did not have an effect on induced hypertrophy due isoproterenol. Isoproterenol increases lipid peroxidation, lactate dehydrogenase, total serum antioxidant and heart tissue, and serum lactate, which seems to be a significant reduction in the levels of MDA, TAC, LDH, and LDH, especially in the early hours of myocardial infarction. Lactate reduces serum levels. But in some cases, with the passage of time does not apply photo effects. Conclusion: The results of this study showed that infliximab, at 24-48 hours after MI, has a protective effect on cardiac myocardial infarction, and in the long term may exacerbate oxidative activity