Thesis (M.Sc.)--Aberdeen University, 2009. / Title from web page (viewed on July 29, 2009). Includes bibliographical references.

Thesis (M.S.)--University of North Texas, May, 2007. / Title from title page display. Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.

No description available.

Resumo: Neste estudo são apresentados os resultados de um trabalho realizado em uma bancada de testes, onde se constatou a diferença de potência elétrica de acionamento e do coeficiente de performance no funcionamento de dois diferentes tipos de compressores: um hermético a pistão e outro rotativo do tipo scroll, operando com inversor de frequência. No estudo variou-se a vazão do fluido refrigerante, e consequentemente o efeito frigorífico, por dois procedimentos distintos: restrição da passagem do refrigerante através de uma válvula de estrangulamento, mantendo-se a rotação do compressor a pistão constante, e por meio de variação de rotação do compressor scroll com aplicação de um inversor de frequência, mantendo-se a válvula de estrangulamento em uma posição fixa. Observou-se também a influência do inversor de frequência no controle da vazão de ar do sistema através de um conjunto motor-ventilador axial. Esse controle ora era realizado por uma válvula de controle "DAMPER", ora por meio da rotação do motor através do emprego do inversor de frequência, com o qual foi possível economizar até 87 % de potência elétrica requerida pelo ventilador. O estudo ainda demonstrou que existe uma faixa de trabalho na qual o inversor de frequência é capaz de economizar até 56 % da potência exigida pelo compressor para uma mesma carga térmica em relação ao compressor desprovido do inversor de frequência, no qual o controle da vazão de refrigerante ocorre através da válvula de estrangulamento. Conclui-se que a utilização do inversor de frequência, em sistemas onde a carga térmica requerida (efeito refrigerante) varia, pode resultar em uma significante economia de energia. / Abstract: This study presents the results of a work carried out on a test bench, where it was verified the difference of the electrical startup power and the performance coefficient of two different types of compressors, namely: a hermetic piston type compressor and a rotating scroll type compressor operating with a frequency inverter. In this study, the refrigerant flow rate was varied and, consequently, the cooling capacity obtained by two distinct procedures: one, by the restriction of the refrigerating flow while maintaining rotation of the piston compressor constant and the other, by varying the scroll compressor rotation through a frequency inverter while keeping the restrictive valve in a fixed position. Is showed also, the influence of frequency inverter in order to control the air flow rate system by employed with fan engine and afterwards compare with method which air flow rate is controlled by DAMPER valve, where until 87 % to fan actuation power was saved. Besides, the study demonstrated that there is a range where the frequency inverter is capable of savings up to 56% of the compressor demanding power for a defined cooling capacity in relation to a compressor without the frequency inverter, in which the refrigerating flow rate control occurs through the restrictive valve. Therefore, it is conclusive that the use of frequency inverters in systems where the required cooling capacity varies, it can result in an appreciated economy of energy. / Orientador: Pedro Magalhães Sobrinho / Coorientador: Teófilo Miguel de Souza / Banca: Agnelo Marotta Cassula / Banca: José Rui Camargo / Mestre

No description available.

Eight groups of approximately ten college students each who smoked at least one package of cigarettes a day were observed for two 30 -minute sessions a week for a 5-week period. During the treatment session, students either made commitments not to smoke during post-treatment sessions, made commitments along with reasons, only gave reasons why they should not smoke, or made no statements.

The problem of this study is to determine the feasibility of using an operant treatment procedure to ameliorate several manifestations of depression. The purpose is to apply contingent positive reinforcement to the detection of nondepressive thoughts and to examine the effects of this procedure upon the frequency of nondepressive thoughts, idiosyncratic depressive manifestations, and scores on the Depression Inventory.

Thesis advisor: Michael McDannald / Uncertainty is a pervasive facet of life, and responding appropriately and proportionally to uncertain threats is critical for adaptive behavior. Aversive prediction errors are signals that allow for appropriate fear responses, especially in the face of uncertainty, and provide a critical updating mechanism to adapt to change. Positive prediction errors (+PE) are generated when an actual outcome of an event is worse than the predicted outcome and increase fear upon future encounters with the related predictive cue. Negative prediction errors (-PE) are generated when the predicted outcome is worse than the actual outcome and decrease fear upon future encounters with the related predictive cue. While some regions have been offered as the neural source of positive and negative prediction errors, no causal evidence has been able to identify their sources of generation. The objective of this dissertation was to causally identify the neural basis of aversive prediction error signaling. Using precise neural manipulations paired with a robust behavioral fear discrimination task, I present causal evidence for vlPAG generation of +PEs and for a ventrolateral periaqueductal grey (vlPAG) to medial central amygdala (CeM) pathway to carry out +PE fear updating. Further, I demonstrate that while dorsal raphe serotonergic neurons are not the source of -PE generation, they appear to receive and utilize this signal. Understanding the neural network responsible for aversive prediction error signaling will not only inform understanding of the neurological basis of fear but also may provide insights into disorders, such as PTSD and anxiety disorders, that are characterized by excessive/inappropriate fear responses. / Thesis (PhD) — Boston College, 2020. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Psychology.

Aim diploma thesis is design and dimensioning central air - conditioning system of offices in industrial object. To air - conditioning was choose 2nd floor office building. Introduction is devoted short entrance to the areas air - conditioning and survey used air - conditioner systems inclusive basic types and possibility using single air - conditioning system practically. Follows computational part, in which is effected heat loss calculation, summer heat gains air - conditioned object and psychrometr calculation summer and winter operationing air - conditioning system. After calculation needed parameters is effected design distribution air, machine - room air conditioning, dimensioning air channels and ventilators, design incoming and off-take anemostats and their regulations. Next part includes calculation power consumption during the operationing designed air - conditioning system.