Power module lifetime evaluation methodologies

2021 ◽  
pp. 157-195
Author(s):  
Noriyuki Miyazaki ◽  
Nobuyuki Shishido ◽  
Yutaka Hayama
Keyword(s):  
Power Module ◽  
Evaluation Methodologies

Development of a 30 GHz-band 20 W microwave power module

1998 ◽  
Author(s):  
Takatsugu Munehiro ◽  
Kurao Nakagawa ◽  
Junichi Matsuoka ◽  
Hajime Fukui
Keyword(s):  
Microwave Power ◽  
Power Module

Scientific and engineering problems involved in the implementation of the project «Manned space systems and complexes»

2019 ◽  
pp. 5-19
Author(s):  
Yevgeny A. Mikrin
Keyword(s):  
Program Completion ◽  
Search And Rescue ◽  
Current Status ◽  
Space Systems ◽  
Power Module ◽  
Orbital Station ◽  
Launch Site ◽  
New Instrumentation ◽  
Manned Space ◽  
Manned Spaceflight

This paper, which is, to a large extent, a review, presents results of an analysis of the current status and future prospects for the development of our country’s manned spaceflight from the standpoint of RSC Energia as the prime organization in Russia in this field of science and engineering. It addresses the issues involved in the ISS Russian Segment deployment completion, which is to be achieved by the addition of three new modules currently being developed at RSC Energia: the Multipurpose Laboratory Module in 2020; the Node Module in 2021; Science and Power Module in 2022, and the development of an improved version of cargo spacecraft Progress-MS. It describes quick ISS rendezvous profiles for crew and cargo transportation spacecraft. It discusses the issues involved in improving the efficiency of the ISS Russian Segment utilization, commercialization problems and plans to expand scientific applied research. The paper explores the desirability of establishing a Russian orbital station after the ISS program completion. As a strategic outlook for the development of our country’s manned space flight the paper formulates proposals on the national program of lunar research and exploration. It summarizes RSC Energia’s proposals on the development of a multifunctional system for crew search and rescue during launches of manned spacecraft from Vostochny launch site. It discusses the results and problems involved in laying the scientific, engineering and manufacturing groundwork for the development of advanced manned space systems, including introduction of digital technologies, development of new instrumentation, use of composite materials, additive and robotic technologies. Key words: Manned spaceflight, ISS Russian Segment, commercialization of scientific research, Russian orbital station, lunar research and exploration program, crew search and rescue system, problems of laying the scientific and engineering groundwork.

A Novel Two-phase Soft Starter Used for Three-phase Asynchronous Motors

2020 ◽  
Vol 13 (8) ◽  
pp. 1175-1182
Author(s):  
Jingwen Chen ◽  
Hongshe Dang
Keyword(s):  
Pulse Generation ◽  
Power Module ◽  
Two Phase ◽  
Power Semiconductor ◽  
Starting Current ◽  
Semiconductor Switches ◽  
Soft Starter ◽  
Three Phase ◽  
And Control ◽  
Driving Circuit

Background: Traditional thyristor-based three-phase soft starters of induction motor often suffer from high starting current and heavy harmonics. Moreover, both the trigger pulse generation and driving circuit design are usually complicated. Methods: To address these issues, we propose a novel soft starter structure using fully controlled IGBTs in this paper. Compared to approaches of traditional design, this structure only uses twophase as the input, and each phase is controlled by a power module that is composed of one IGBT and four diodes. Results: Consequently, both driving circuit and control design are greatly simplified due to the requirement of fewer controlled power semiconductor switches, which leads to the reduction of the total cost. Conclusion: Both Matlab/Simulink simulation results and experimental results on a prototype demonstrate that the proposed soft starter can achieve better performances than traditional thyristorbased soft starters for Starting Current (RMS) and harmonics.

scholarly journals Diagnostic tools for neurosyphilis: a systematic review

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Gustavo Henrique Pereira Boog ◽  
João Vitor Ziroldo Lopes ◽  
João Vitor Mahler ◽  
Marina Solti ◽  
Lucas Tokio Kawahara ◽  
...  
Keyword(s):  
New Technologies ◽  
Clinical Suspicion ◽  
Risk Of Bias ◽  
Diagnostic Methods ◽  
Diagnostic Tools ◽  
Test Accuracy ◽  
Cerebrospinal Fluid Analysis ◽  
Evaluation Methodologies ◽  
Fluid Analysis ◽  
Criteria For Diagnosis

Abstract Purpose Increasing incidences of syphilis highlight the preoccupation with the occurrence of neurosyphilis. This study aimed to understand the current diagnostic tools and their performance to detect neurosyphilis, including new technologies and the variety of existing methods. Methods We searched databases to select articles that reported neurosyphilis diagnostic methods and assessed their accuracy, presenting sensitivity and specificity values. Information was synthesized in tables. The risk of bias was examined using the Cochrane Handbook for Systematic Reviews of Diagnostic Test Accuracy recommendations. Results Fourteen studies were included. The main finding was a remarkable diversity of tests, which had varied purposes, techniques, and evaluation methodologies. There was no uniform criterion or gold standard to define neurosyphilis. The current basis for its diagnosis is clinical suspicion and cerebrospinal fluid analysis. There are new promising tests such as PCR tests and chemokine measurement assays. Conclusions The diagnosis of neurosyphilis is still a challenge, despite the variety of existing and developing tests. We believe that the multiplicity of reference standards adopted as criteria for diagnosis reveals the imprecision of the current definitions of neurosyphilis. An important next step for the scientific community is to create a universally accepted diagnostic definition for this disease.

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