نتایج جستجو برای: power density

تعداد نتایج: 865915  

ژورنال: انرژی ایران 2018

In his paper, performance modeling and parametric study of a tubular solid oxide fuel cell (SOFC) fed by hydrogen was conducted. The components of the fuel cell system and its reactions were entirely modelled and an electrochemical analysis done for it. A variety of modeling parameters including temperature, working pressure and the air mass- flow rate have been investigated in order to observe...

Abolfazl Rezaei, Bahman Mirzaei, Farhad Rahmani-Nia Mahdi Ghahremani Moghadam Seyed Javad Ziyaolhagh

Objective(s)This study was designed to evaluate the effect of Ramadan fasting on body composition, aerobic and anaerobic power, strength, plasma lipids profile and serum glucose among collegiate wrestlers.Materials and Methods Fourteen male collegiate wrestlers (age, 20.12±2.5 yrs) volunteered as subjects for the study. Subjects were tested one week before the beginning of Ramadan, the last two...

2012
Paul V. Braun Jiung Cho James H. Pikul William P. King Huigang Zhang

Energy and power density are the key figures of merit for most electrochemical energy storage systems. Considerable efforts worldwide have been made to improve the energy density of rechargeable (secondary) batteries, as this is critical for most applications. As the penetration of batteries into ever more demanding applications has increased, power density, the allowed rate of energy transfer ...

2012
R. T. NAAYAGI N. E. MASTORAKIS

This paper presents the simulation performance of Dual Active Bridge (DAB) DC-DC converter for high power density aerospace applications. The DAB converter topology has been chosen as it features high power density, high efficiency, bidirectional power flow capability, inherent soft switching, galvanic isolation and low number of passive components. Hence the converter is a candidate for high p...

In this paper, a bidirectional DC-DC converter with high power density for energy storage application is proposed. The presented converter provides power transfer in both directions only with adjusting phase shift angle. Zero voltage switching (ZVS) in both turn on and turn off moments of all switches is the major capability of the converter that makes it suitable for high power applications. Z...

2017
Anil Kanduri Amir M. Rahmani Pasi Liljeberg Ahmed Hemani Axel Jantsch Hannu Tenhunen

The possibilities to increase single core performance has ended due to limited instruction level parallelism and a high penalty when increasing frequency. This prompted designers to move towards multi-core paradigms [1], largely supported by transistor scaling [2]. Scaling down transistor gate length makes it possible to switch them faster at a lower power, as they have a low capacitance. In th...

2006
Dirk Mauler Rainer Martin

In this contribution the Minimum Statistics noise power spectral density estimator [1] is revised for the particular case of highly correlated data which is observed for example when framewise processing with considerable frame overlap is performed. For this special case the noise power estimator tends to underestimate the noise power. We identify the variance estimator in the Minimum Statistic...

2012
Neda Faraji Richard C. Hendriks

In many public areas, public address systems play a central role in broadcasting important messages. Consider e.g., airports or train stations. The intelligibility of messages broadcast by such public address systems gets reduced due to environmental noise sources. Usually, these systems therefore employ a pre-processing module to modify the original message such that its intelligibility in the...

Journal: :jundishapur journal of health sciences 0
mohammad ali behnajady department of chemistry, tabriz branch, islamic azad university, tabriz, ir iran; mohammad ali behnajady, department of chemistry, tabriz branch, islamic azad university, tabriz, ir iran. tel: +98-4133396025, fax: +98-4133333458 behrouz vahid department of chemistry, tabriz branch, islamic azad university, tabriz, ir iran

conclusions the present research demonstrated that the ultrasonic (us) process can be utilized as an effective and simple method for treatment of mg dye in an aqueous solution. moreover, the eeo is directly proportional to the mg concentration and power density and inversely proportional to temperature and mechanical agitation, which can be predicted by the obtained empirical kinetics model. co...

2004
Jan NOVOTNÝ Pavel SOVKA Jan UHLÍŘ

This paper addresses the problem of the mismatch between a silence model and background noises which often occurs in a telephone speech recognition system (SRS) application. At first, the use of parallel model combination (PMC) methods is studied with the respect to this application. Secondly, the effective adaptation of a silence model to various background noises is confirmed. Finally, an ori...

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