نتایج جستجو برای: collector orientation

تعداد نتایج: 110198  

Journal: :Coatings 2022

Poly(vinylidene fluoride) (PVDF)-electrosprayed nanofibers have been the subject of much research due to their flexibility and piezoelectric properties compared other piezoelectrics, for example, ceramics or polymeric materials. The performance PVDF is mainly related presence ?-phase. This study aims determine influence working formulation parameters on generation ?-phase, morphology, crystal s...

Journal: : 2022

This article considers the possibilities of using solar energy for supply residential and communal facilities in winter period year. The efficiency and, as a result, amount received depends on intensity radiation per unit area, therefore, to evaluate prospects use energy, modeling throughout year particular during heating was carried out. When radiation, three components falling an inclined sur...

Journal: :Microelectronics Reliability 2014
Kazunori Hasegawa Kenichi Yamamoto Hidetaro Yoshida Kota Hamada Masanori Tsukuda Ichiro Omura

This paper proposes a new short-circuit protection method for an IGBT. The proposed method is characterized by detecting not only gate charge but also gate voltage of the IGBT. This results in a shorter protection time, compared to the previous method that detects only the gate charge. A real-time monitoring system using an FPGA, A/D converters, and a D/A converter is used for the proposed prot...

2007
Chunxiao Lin Yiyun Chen Bei Hua

Many of the current software systems rely on garbage collectors for automatic memory management. This is also the case for various software systems in realtime applications. However, a real-time application often requires an incremental working style of the underlying garbage collection, which renders the garbage collector more complex and less trustworthy. We present a formal verification of t...

2014
Bing Hu Xianbiao Bu Weibin Ma

To develop the organic Rankine-vapor compression ice maker driven by solar energy, a thermodynamic model was developed and the effects of generation temperature, condensation temperature, and working fluid types on the system performance were analyzed. The results show that the cooling power per square meter collector and ice production per square meter collector per day depend largely on gener...

2016
Abdul Waheed Badar Reiner Buchholz Felix Ziegler Brian Norton

The overall heat loss coefficient (U-value) of a vacuum tube solar collector is investigated experimentally and theoretically with regard to the pressure of the remaining gas inside the evacuated glass envelope. A number of collector tubes of same geometry are randomly selected from an installation of a solar based air-conditioning system and tested individually in the laboratory for the determ...

Journal: :Applied optics 1981
A Luque J M Gómez

The maximum power cast on a collector from a source of finite angular extension by a concentrator of fixed position occurs when the collector sees the concentrator as a Lambertian source. Concentrators not fully meeting this requirement are evaluated using a parameter called the shape quality factor. Lambertian concentrators can be obtained with mirrors but not with lenses of finite n. In many ...

2001
T. Merrigan Carlos J. Colon

The Florida Solar Energy Center (FSEC), with the support of the National Renewable Energy Laboratory (NREL), has investigated the thermal performance of solar absorbers which are an integral yet indistinguishable part of a building’s roof. The first roof-integrated solar absorber (RISA) system was retrofitted into FSEC’S Flexible Roof Facility in Cocoa, Florida in September 1998. This “proof-of...

1996
V. A. Posse B. Jalali A. F. J. Levi

Current driven instabilities in the collector of III–V heterojunction bipolar transistors ~HBT! are investigated. Numerical simulations indicate that in a modified AlGaAs/GaAs HBT the collector current shows oscillatory behavior due to the transferred-electron ~Gunn–Hilsum! effect. Influence of the Kirk effect as well as conditions for oscillation are discussed. © 1995 American Institute of Phy...

2003
Dominique Foata Doron Zeilberger

Further computations are made on the traditional coupon collector’s problem when the collector shares his harvest with his younger brothers. When the book of the p-th brother of the collector is completed, the books of the younger brothers have certain numbers of empty spots. On the average, how many? Several answers can be brought to that question.

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