Nonstoichiometry and defect structure of γ-NaxCoO2

γ-NaxCoO2, has long been known to be the best ever p-type oxide thermoelectric, but its oxygen nonstoichiometry and defect structure remains unelucidated. In this work, we measured oxygen nonstoichiometry and electrical conductivity on the system of γ-NaxCoO2 against oxygen activity (aO2) across its widest ever range below aO2=1 for a fixed Na-content x=0.706 at different temperatures in the range of 773-973 K, and at a fixed temperature 973 K for x=0.664, 0.706 and 0.731, respectively. It has been deduced therefrom that as aO2 decreases, the majority disorder type shifts from [VNa’]≈p to either [VNa’]≈[CoNa••] or [VNa’]≈[Coi•••], however, exhibiting a positive deviation from the ideal defect behavior. The latter is attributed to the positive deviation of holes due to their degeneracy. By taking into appropriate account of the activity coefficient of holes in terms of the Fermi-Dirac integral of order 1/2, the nonstoichiometry and electrical conductivity have been precisely and consistently depicted to evaluate the defect-chemical parameters including the effective mass and mobility of holes and the redox equilibrium constant. The phase-stability limit of γ-NaxCoO2 is also reported against temperature and Na-content

Trust your instincts:The relationship between intuitive decision making and happiness

Epstein (1994; 2003) proposed that there are two cognitive information processing systems that operate in parallel: the intuitive thinking style and the rational thinking style. Decisional fit occurs when the preferred thinking style is applied to making a decision and research has shown that this fit increases the value of the outcome of a decision. Additionally, decisional fit leads to less regret, even when post hoc evaluations show the decision to be incorrect. It has not yet been determined whether decisional fit correlates with greater happiness and hence, the purpose of the current study was to investigate the difference between styles of thinking, styles of decision making and the impact of decisional fit on happiness scores. Individual differences in thinking and decision style were measured using an online interactive questionnaire (N = 100), and an ANOVA, hierarchical multiple regression, and a series of t-tests, were used to investigate the relationship between thinking style, decision style, decisional fit, and happiness, thereby addressing a gap in the existing literature. The major findings from the current study show that intuitive thinking has a strong positive correlation with happiness; that intuitive thinkers are more likely to utilize intuitive decisional style, than rational thinkers; and that when both rational and intuitive thinkers experienced decisional fit, higher ratings of happiness were reported. Explanations and recommendations for future studies are outlined in the discussion

Закономерности формирования структуры и фазового состава поверхностного слоя силумина, подвергнутого электронно-пучковой обработке

It has been shown that electron beam treatment of silumin is accompanied by the formation of multilayer submicro-and nanocrystalline structure and result in increasing the microhardness of the surface layer (towards the core) is ~ 1.5 times up to 2 GPa

Расчет и выбор шахтного электрооборудования

Реферат Выпускная квалификационная работа объемом 101 страницы, содержит 15 рисунков, 39 таблиц, 21 используемых источника. Ключевые слова: СИСТЕМА ЭЛЕКТРОСНАБЖЕНИЯ, ВНУТРИЦЕХОВОЕ ЭЛЕКТРОСНАБЖЕНИЕ, ЭЛЕКТРИЧЕСКИЕ НАГРУЗКИ, КОМПЛЕКТНОЕ ЭЛЕКТРООБОРУДОВАНИЕ, Объектом исследования является система электроснабжения ОАО «Шахта Распадская» г. Междуреченск. В результате выполнения работы был произведён выбор схемы внешнего и внутреннего электроснабжения, высоко- и низковольтное оборудование. Выпускная квалификационная работа выполнена в текстовом редакторе Microsoft Word 2010. Работа представлена на CD - диске (в конверте на обороте обложки).Final qualifying work of 101 pages, contains 15 figures, 39 tables, 21 sources used. Keywords: Electric power supply systems, intrashop POWER, ELECTRICAL LOAD COMPLETE ELECTRICAL, The object of research is the system of power supply of "Raspadskaya" Mezhdurechensk. As a result of the work was made selection of the internal and external power supply, high and low-voltage equipment. Final qualifying work carried out in Microsoft Word 2010 word processor. The work is presented on the CD - ROM (in an envelope on the back cover)