280 research outputs found
Power Switching Device Losses - Simulation and Non-Simulation Methods of Calculations
In the design and manufacture of power supplies and converters, commercial factors demand high efficiency figures in the operation and performance of these products. Potential loss areas in the circuits are identified to achieve minimum losses [1] [2]. One of the main component contributing to losses in converters is the switching device.The methods to calculate switching loss [3] are complex and involves several related parameters [4] [5]. Conduction loss, radiation interference [6] and temperature rise, impacts on design efficiency. Depending on the design limitations, a balance between the related parameters is necessary, which can be achieved by optimization processes. The method of linear approximation has useful deductions in the control of turn-on switch loss, choosing switches devices with short switching times, which offers high operating frequencies
Optimisation and Simulation of RC Time Constants in Snubber Circuits
Semiconductor devices are subjected to elevated levels of stresses when used at high voltage high current and temperature applications. This stress is mainly due to hard switching which is proportional to the switching frequency. This paper presents methods used to remove this energy to prevent expensive switch damage due to overheating and high dv/dt oscillations. In confirmation of the research title, the process in the determination of 'RC' in snubber circuits has been proven by OrCAD optimisation and presented
Heterogeneous electrocatalysis in porous cathodes of solid oxide fuel cells
A general physics-based model is developed for heterogeneous electrocatalysis
in porous electrodes and used to predict and interpret the impedance of solid
oxide fuel cells. This model describes the coupled processes of oxygen gas
dissociative adsorption and surface diffusion of the oxygen intermediate to the
triple phase boundary, where charge transfer occurs. The model accurately
captures the Gerischer-like frequency dependence and the oxygen partial
pressure dependence of the impedance of symmetric cathode cells. Digital image
analysis of the microstructure of the cathode functional layer in four
different cells directly confirms the predicted connection between geometrical
properties and the impedance response. As in classical catalysis, the
electrocatalytic activity is controlled by an effective Thiele modulus, which
is the ratio of the surface diffusion length (mean distance from an adsorption
site to the triple phase boundary) to the surface boundary layer length (square
root of surface diffusivity divided by the adsorption rate constant). The
Thiele modulus must be larger than one in order to maintain high surface
coverage of reaction intermediates, but care must be taken in order to
guarantee a sufficient triple phase boundary density. The model also predicts
the Sabatier volcano plot with the maximum catalytic activity corresponding to
the proper equilibrium surface fraction of adsorbed oxygen adatoms. These
results provide basic principles and simple analytical tools to optimize porous
microstructures for efficient electrocatalysis
Exposure to Apoptotic Activated CD4+ T Cells Induces Maturation and APOBEC3G- Mediated Inhibition of HIV-1 Infection in Dendritic Cells
Dendritic cells (DCs) are activated by signaling via pathogen-specific receptors or exposure to inflammatory mediators. Here we show that co-culturing DCs with apoptotic HIV-infected activated CD4+ T cells (ApoInf) or apoptotic uninfected activated CD4+ T cells (ApoAct) induced expression of co-stimulatory molecules and cytokine release. In addition, we measured a reduced HIV infection rate in DCs after co-culture with ApoAct. A prerequisite for reduced HIV infection in DCs was activation of CD4+ T cells before apoptosis induction. DCs exposed to ApoAct or ApoInf secreted MIP-1α, MIP-1β, MCP-1, and TNF-α; this effect was retained in the presence of exogenous HIV. The ApoAct-mediated induction of co-stimulatory CD86 molecules and reduction of HIV infection in DCs were partially abrogated after blocking TNF-α using monoclonal antibodies. APOBEC3G expression in DCs was increased in co-cultures of DCs and ApoAct but not by apoptotic resting CD4+ T cells (ApoRest). Silencing of APOBEC3G in DC abrogated the HIV inhibitory effect mediated by ApoAct. Sequence analyses of an env region revealed significant induction of G-to-A hypermutations in the context of GG or GA dinucleotides in DNA isolated from DCs exposed to HIV and ApoAct. Thus, ApoAct-mediated DC maturation resulted in induction of APOBEC3G that was important for inhibition of HIV-infection in DCs. These findings underscore the complexity of differential DC responses evoked upon interaction with resting as compared with activated dying cells during HIV infection
Predicting Progression of IgA Nephropathy: New Clinical Progression Risk Score
IgA nephropathy (IgAN) is a common cause of end-stage renal disease (ESRD) in Asia. In this study, based on a large cohort of Chinese patients with IgAN, we aim to identify independent predictive factors associated with disease progression to ESRD. We collected retrospective clinical data and renal outcomes on 619 biopsy-diagnosed IgAN patients with a mean follow-up time of 41.3 months. In total, 67 individuals reached the study endpoint defined by occurrence of ESRD necessitating renal replacement therapy. In the fully adjusted Cox proportional hazards model, there were four baseline variables with a significant independent effect on the risk of ESRD. These included: eGFR [HR = 0.96(0.95–0.97)], serum albumin [HR = 0.47(0.32–0.68)], hemoglobin [HR = 0.79(0.72–0.88)], and SBP [HR = 1.02(1.00–1.03)]. Based on these observations, we developed a 4-variable equation of a clinical risk score for disease progression. Our risk score explained nearly 22% of the total variance in the primary outcome. Survival ROC curves revealed that the risk score provided improved prediction of ESRD at 24th, 60th and 120th month of follow-up compared to the three previously proposed risk scores. In summary, our data indicate that IgAN patients with higher systolic blood pressure, lower eGFR, hemoglobin, and albumin levels at baseline are at a greatest risk of progression to ESRD. The new progression risk score calculated based on these four baseline variables offers a simple clinical tool for risk stratification
"Mother-weights" and lost fathers: parents in South Asian American literature
That parent-child relationships should play a significant role within South Asian American literature is perhaps no surprise, since this is crucial material for any writer. But the particular forms they so often take – a dysfunctional mother-daughter dynamic, leading to the search for maternal surrogates; and the figure of the prematurely deceased father – are more perplexing. Why do families adhere to these patterns in so many South
Asian American texts and what does that tell us about this œuvre? More precisely, why are mothers subjected to a harsher critique than fathers and what purpose does this critique serve? How might we interpret the trope of the untimely paternal death? In this article I will seek to answer these questions – arguably key to an understanding of this growing body of writing – by considering works produced between the 1990s and the early twenty-first century by a range of South Asian American writers
IPO Pricing and the Relative Importance of Investor Sentiment - Evidence from Germany
Veröff. im Internet: Lehrstuhl für Betriebswirtschaftslehre, insbesondere Finanzwirtschaft / Forschung / Veröffentlichungen und Downloads / BAFIF
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