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Abstract

A principle diagram of a high-voltage low-power power supply for devices comprising a microchannel plate (MCP) has been developed. A mathematical model was built according to the developed scheme for a detailed study of the operation of the power supply and the selection of the optimal parameters of its components and obtaining the best output voltages. The power supply circuit comprises a control circuit, a pulse transformer, a voltage multiplier circuit, a feedback circuit, and an input stabilizer. The input stabilizer provides the maintenance of the voltage switched in the primary winding of the transformer at a given level regardless of the voltage drop of the power supply primary source. Moreover the stabilizer provides constant voltage maintenance when the load resistance changes. (with Rload changing from 100 to 200 MΩ, Uout did not exceed 3 V).
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Bibliography

[1]. Rosanna Rispoli, Elisabetta De Angelis, Luca Colasanti, Nello Vertolli, Stefano Orsini «ELENA microchannel plate detector: absolute detection efficiency for low energy neutral atoms», Optical Engineering, 2013.
[2]. O. Chassela A. Grigoreiv A. Fedorov N. André, «Resistance and gain of the microchannel plate (MCP) detector as a function of temperature», International Conference on Space Optics—ICSO, 2018.
[3]. J Upadhyay, H. R. Bundel, R. Chandra, J. A. Chakera, C.P. Navathe and P.D. Gupta, «A simple power supply and control unit for pulsed operation of a microchannel plate imaging detector», 1998.
[4]. Zhi Qiang, Yang Ye, Yan Bo, Li Jun-guo, Ni Xiao-bing, Wang Yu, Yao Ze, «The Cathode Control Circuit Design of Auto-Gating Power Supply for Low-Light-Level Image Intensifier», Science and Technology on Low-Light-Level Night Vision Laboratory, Xi’an, China, 2015.
[5]. Chengquan Peia, Jinshou Tianb, Zhen Liua, Hong Qinc, Shengli Wua, «A novel ZVS high voltage power supply for micro-channel plate photomultiplier tubes», 2017.
[6]. Cristian H. Belussi, Mariano Gómez Berisso, Yanina Fasano, «Low-noise High-voltage DC Power Supply for Nanopositioning Applications», 2014.
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Authors and Affiliations

Boris Martemianov
1
Alexander Ryzhkov
1
Grigoriy Vdovin
1

  1. Limited Liability Company Vladikavkaz Technological Center "BASPIK", North Osetia
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Abstract

This article presents a computer simulation carried out in the Solidworks environment, the bumper beam of a passenger car was tested. The simulation took into account the influence of various aluminum alloys and the type of reinforcement in the crosssection of the beam on the strength of the entire element at the time of collision at different forces. The analysis provided answers in which places the accumulation of stresses occurs, and thus the places most exposed to destruction
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Authors and Affiliations

A. Śliwa
1
ORCID: ORCID
W. Mikołejko
1
ORCID: ORCID
M. Bonek
1
A. Dziwis
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Mechanical Engineering, Institu e of Materials Engineering and Biomedical Sciences, 18A S. Konarskiego St r., 44-100 Gliwice, Poland
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Abstract

Feeder cells can promote cell proliferation and help overcome the developmental arrest of early embryos by producing growth factors. The objective of this study was to evaluate the effects of feeder cells on the development of all single porcine parthenogenetic embryos in vitro. Firstly, we showed that the cleavage and blastocyst formation rate of all single procine parthenogenetic embryos co-cultured with feeder cells increased in contrast to those cultured without feeder cells (p<0.05). However, no statistically significant differences were observed between the blastocyst formation rate in the embryos co-cultured with 3 different kinds feeder cells namely oviduct epithelial feeder cells, granulose feeder cells and porcine fetal fibroblast feeder cells (p>0.05). Secondly, highly significant differences were observed between the cleavage and blastocyst formation rate (p<0.05) when the embryos were co-cultured with oviduct epithelial feeder cells in different volume drops ranging from 3 to 20 μL and the cleavage rate were the highest when cultured in 5 μL drops. Thirdly, the tempospacial pattern of the development of single embryos co-cultured with oviduct epithelial feeder cells was consistent with that of traditional multi-embryo culture, indicating that the co-culturing does not affect the developmental competence of the porcine parthenogenetic embryos. Finally, highly significant differences were observed between the cleavage and blastocyst formation rate with and without zona pellucida in vitro (p<0.05). In this study, a new adaption of in vitro co-culture of single porcine parthenogenetic embryos using feeder cells has been successfully established and this will facilitate further investigations to discover the mechanistic mode of developmental arrest of porcine embryos.

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Authors and Affiliations

L. Zhang
Z. Lin
Z. Hua
X. Zheng
H. Xiao
W. Hua
H. Ren
Z. Zhu
A. Molenaar
Y. Bi

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