9 research outputs found
The comparative study of the specific heat capacity of uranium dioxide according to the fractal structure
No full textIn the present study, we investigate the effectiveness of existing methods for evaluating the heat capacity of uranium dioxide (UO2) by considering the fractal structure of materials. Two well-known theoretical methods were investigated in this work which have the advantages of giving accurate and efficient calculation results for the heat capacities of uranium dioxide for a wide range of temperatures. To verify the effectiveness of these theoretical methods, we compare the calculation results with existing experimental data from the literature. Based on the concept of fractality, the results obtained in this work are useful for determining the best theoretical approaches, i.e., those that are more convenient and meaningful for the evaluation of the heat capacities of uranium dioxide. The approaches and results presented in this study can provide useful knowledge for accurate investigations of the physical properties of other nuclear fuels
Full Analytical Evaluation of the Einstein Relation for Disordered Semiconductors
No full textWe present a simple analytical method for the evaluation of the Einstein relation for disordered semiconductors with exponential distribution of tail states. The proposed analytical method is based on the binomial expansion theorems, and the calculation result permitted an accurate evaluation of the validity of the analytical approximation, as well as further improvement of the theoretical formulas. The accuracy and the efficiency of the obtained formulas of the Einstein relation for disordered semiconductors are demonstrated with the comparison of the numerical and analytical results. The formulas can be used to analyze the experimental results
An analytical evaluation method of the temperature dependence of resistive losses in electric motors
No full textIn this work, the temperature dependence of motor resistive losses has been analytically evaluated by using a quantum mechanical approximation. It is well known that the Bloch-Gruneisen approximation is a fundamental quantum theory to the study of the resistivity of the conductor with the change of temperature by using analytical formulation. By using the proposed method, the motor resistive losses can be controlled with respect to the temperature changes. The accuracy of the proposed algorithm has been tested by comparison with different theoretical approaches. It is demonstrated that the new analytical method for the motor resistive losses controlled with the change of temperature will be used for improving motor power and mechanical systems
Analytical investigation of thermodynamic properties of power electronic semiconductor materials
No full textTheoretical and experimental investigations are critical for accurately investigating the structure and physical properties of semiconductors, allowing their widespread use in power electronic devices. The heat capacities are important thermal properties needed to examine the electronic and electrical properties of device materials. The specific heat capacities of power electronic semiconductors, such as (GaN\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}) gallium nitride, (SiC\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}) silicon carbide, (Ga2O3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}) gallium oxide, and diamond, have been evaluated theoretically using the recently developed Einstein-Debye approximation. On the grounds of the Einstein-Debye approach, the derived general analytical expression for the calculation of the heat capacities is valid for the entire temperature range. The calculation results are compared with the previously available experimental and theoretical data for illustrating the correctness of the method. The evaluation and literature analysis confirm the effectiveness of the proposed method. As seen from the comparison with various results reported in the literaure, the results obtained from this approach are convenient and competitive
Norwegian Men and Women Value Similar Mate Traits in Short-Term Relationships
No full textPrevious research has provided evidence that females are generally the more selective sex in humans. Moreover, both sexes have been found to be more selective in long-term mating compared to short-term mating. In this study, we have examined the effects of sex, mating strategy (preferred relationship length) and their interaction on mate preferences (i.e., mate selection criteria) in an egalitarian Nordic society, namely Norway. The study sample consisted of 1,000 individuals, 417 of whom were male and 583 female respondents. According to our findings, men were more selective in physical appearance, whereas women were more selective in all the other mate preferences (e.g., understanding, dominant, kind, intellectual etc.). The respondents that were seeking short-term relationships had higher preference for physical appearance, humorousness and sociability. On the other hand, the respondents that were seeking long-term relationships were more selective in most of the other mate preferences (i.e., understanding, kind, cultivated, domestic, reliable, and similar). Interestingly, no interaction effect was found between sex and mating strategy in that differences between long-term and short-term seekers in mate preferences did not change depending on sex. This suggests that men and women value the same traits in short-term relationships.Peer reviewe
The impact of cultural events on the cinema and tourism in a community, BusanBusan's alternative industry to the cinema and tourism industry after the Pusan International Film Festival (PIFF)
No full textPlan BAn event is the most exciting and fastest growing industry related to leisure. Events can be viewed as part of the new wave of alternative tourism. This is the reason that tourism organizations in many countries actively promote events. An event induces tourists to participate. It makes them stay longer in the area which has held the event. An event generates jobs for the residents. The residents would need to develop an infrastructure to provide the many needed facilities. This study researched the economic impact of the Pusan International Film Festival (PIFF) on the tourism and cinema industry in Busan, South Korea. The festival was developed with attractive characteristics as a cultural event. The finding of this study supports the positive economic impact, development of the cinema and tourism industries, and the attitude of residents before and after PIFF in Busan. Key words: event, special event, festival, event tourism, culture, infrastructure. Busan*, Pusan International Film Festival (PIFF)** ( */** Today Busan officially uses ‘B’ for Busan.. However PIFF was launched in 1996 before Busan decided their English spelling for the name. PIFF uses ‘P’ for Busan. In this study Busan and Pusan are the same city.
Elektrik empedans spektroskopi meme doku kayıtlarının sınıflandırılmasında topluluk algoritmalarının başarısı
No full textEroğlu, Kübra (Arel Author) --- 2014 22nd Signal Processing and Communications Applications Conference, SIU 2014 -- 23 April 2014 through 25 April 2014 -- TrabzonIn this study was performed by using records from breast tissue electrical impedance spectroscopy analysis. The aim of the study is to reveal the impact of ensemble algorithms on success of the classification performance in the classification of normal and pathological breast tissue classification. For this purpose have been used three different ensemble algorithms they are bagging, adaboost, random subspaces and three main basic classifiers, which are RF, YSA, DVM. The results obtained are supplemented with performance analysis and ensemble algorithms have been demonstrated to increase classification performance results. The results obtained by the combined use of adaboost ensemble algorithm with RF basic classifier demonstrate, that the success rate was higher than the others (%89.62). © 2014 IEEE
Techno-economic and environmental assessment of gas turbines utilizing biofuels
No full textThe continued global reliance on fossil fuels with impact on resource depletion, human health, atmospheric pollution and environmental degradation has necessitated a global drive to integrate renewable fuels such as biodiesels. Biodiesels are described as “fuels composed of fatty acid methyl or ethyl esters and obtained from vegetable oils or animal fats”. Their use in energy generation could diversify the world’s energy mix, reduce fossil fuel dependence, reduce emissions and energy cost to bring about other economic benefits, especially for developing economies and rural communities with lack of adequate access to modern energy. A techno-economic and environmental life cycle assessment is however required to ensure that these fuels are fit for use in engines and meet any regulatory standard and sustainability criteria. This thesis has evaluated the use of Jatropha- and microalgae-biodiesel for power generation in two industrial gas turbines with open and combined cycle configuration. This was achieved using a techno-economic and environmental life cycle impact assessment framework. Comparative fuel assessments have been carried out between biodiesels and fossil fuels. Furthermore, the concept of microbial fuel degradation was examined in gas turbines. The thesis have identified Jatropha biodiesel as a worthwhile substitute for conventional diesel fuel, because it has close performance and emission characteristics to conventional diesel fuel with added advantage of being renewable. The consequent displacement of conventional diesel fuel with Jatropha biodiesel has significant environmental benefits. For economic viability and sustainability of gas turbine operated power plants, energy producers require a minimum monetary amount to recover the added cost of operating 100% Jatropha biodiesel. Other integration mechanisms are also available for utilizing the fuel in engines without compromising on plant’s economic performance. In worst case scenarios, where there are no government incentives, local conditions such as high life cycle cost of electricity, open opportunities for distributed and independent power generation from renewable fuels like Jatropha-biodiesel. Furthermore, this thesis has identified salient energy conversion processes that occur in gas turbine fuels, especially with biodiesels and developed a bio-mathematical model, Bio-fAEG to simulate these processes in gas turbines. This platform is a first step in quantifiable assessment and could enable a better understanding of microbial initiated processes
Holiday Destinations: Understanding the Perceptions of Omani Outbound Tourists
No full textIt is becoming increasingly difficult to ignore the growing numbers of Islamic tourists from countries such as the Gulf Cooperation Council (GCC) zone and Indonesia. This thesis aims to understand Omani outbound pleasure travellers by identifying their travel motivations, the main travel and leisure constraints they experience, and how they overcome these constraints. It also investigates the influence of Islamic teachings on their choice of a pleasure destination and their participation in leisure activities.
The main data collection methods involved in-depth interviews (n = 27) (the qualitative phase), and the distribution of a self-completion questionnaire (n = 298) (a quantitative phase) to both actual travellers and non-travellers. A mixed method approach allowed further insight into the research phenomenon as well as enhancing the trustworthiness of the research findings. Content analysis was used to analyse the qualitative data using CatPac (CATegory PACkage) and Leximancer software, while the quantitative data were analysed by utilising analysis techniques including T-tests, ANOVA, factor analysis, cluster analysis, regression, and MANOVA in SPSS.
The study identifies: (a) the most important push and pull travel motivations for Omani outbound tourists; (b) the main travel and leisure constraints that inhibit Omanis from travelling overseas and participating in leisure activities; and, (c) the most frequent travel and leisure negotiation strategies that are adopted to overcome these constraints. The results of the study also determine the influence of socio-demographic variables (gender, marital status, age, educational level, income, and occupation) on Omani tourists' perceptions and behaviours. In terms of the impact of Islamic teachings, this study finds that the Islamic teachings have an indirect influence on the choice of a pleasure travel destination and a direct influence on participation in leisure activities. In relation to market segmentation, the study finds that it is possible to segment Omani outbound tourists based on their travel motivations. Further, this study suggests that participation, or nonparticipation, in overseas travel is an outcome of the joint action of travel motivations and constraints. Other useful findings relate to the three-dimensional leisure constraints model as well as the influence of travel motivations and constraints on the use of negotiation strategies are reported.
The current study provides information that will aid the travel and leisure industry in targeting the Muslim travel market to formulate effective marketing strategies and develop appropriate product plans. Finally, both the managerial implications of the study’s results, and possible future research directions, are discussed
