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CSEE Journal of Power and Energy Systems 2017年第3期3卷 302-310页

作者： robin simpson Ashley Plumpton Michael Varley Charles Tonner Paul Taylor Xiaoping Dai Dynex Semiconductor Limited LincolnLN63LFUK

The popularity of insulated gate bipolar transistors(IGBTs)for use in high-voltage direct current(HVDC)transmission and flexible AC transmission systems(FACTS)is ***,for these applications wire-bond IGBT technology has a number of shortcomings,such as insufficient current ratings for the most powerful schemes,and inability to fail to ***-pack IGBT technology,conversely,offers increased current ratings,and an inherent short-circuit failure mode,making it a more attractive choice for HVDC and ***,the design and manufacture of these devices requires a comprehensive understanding of the unique technical challenges,which differ markedly from those for wirebond modules or traditional pressure contact *** challenges include providing a high degree of mechanical protection for the IGBT chip against normal operating ***,it is essential to achieve uniform contact pressure across each chip surface to ensure optimum *** achieve this,manufacturers have designed products that use rigid copper electrodes manufactured to tighter tolerances than for other pressure contact devices,such as thyristors,and products that use compliant electrodes,incorporating spring *** is in the advanced stages of development of press-pack IGBT technology with demonstrated robust solutions for the technical challenges outlined in this *** success has been achieved through the use of state-of-the-art simulations in conjunction with a long history of manufacturing expertise for bipolar and IGBT ***,multiple press-pack IGBT variants are currently undergoing evaluation tests prior to product release.

关键词： Flexible AC transmission systems HVDC transmission insulated gate bipolar transistors press-pack IGBT STATCOM VSC

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Gamma Photon Column Scanning of Prototype and Industrial Distillation Columns

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World Journal of Engineering and Technology 2023年第3期11卷 476-492页

作者： Witness Chirume Joseph simpson Dongo Caven Dzingai robin Tinavo Mashingaidze Stanford Mudono Rachad Alami Peter Baricholo Applied Physics Department National University of Science and Technology (NUST) Bulawayo Zimbabwe Chemical Engineering Department National University of Science and Technology (NUST) Bulawayo Zimbabwe Instrumentation and Industrial Applications National Centre of Nuclear Energy Sciences and Techniques (CNESTEN) Rabat Morocco

Monte Carlo simulation of gamma photon transport and interaction with the distillation column and its contents was performed in order to predict the effects of gamma photons when they interact with matter. The results of the interaction and transport of gamma photons are presented as energy deposition on the distillation column and its contents. Energy attenuation was more pronounced on the column walls and trays as compared to the region between the trays, where there is mostly vapour space. Gamma column scanning was then used to verify the Monte Carlo simulation results by scanning and investigating the integrity of two laboratory prototype distillation and industrial distillation columns. One of the prototype distillation columns was 1 m tall with four trays and the other one was 1.8 m tall consisting of six trays and a packed bed. Commonly encountered distillation column malfunctions such as collapsed tray, weeping, flooding and foaming were simulated in the two prototype distillation columns and scanned. The industrial distillation column was a 26 m tall benzole prefractionator column, consisting of 60 single pass trays and a diameter of 0.8 m. A 10 mCi 60Co gamma radiation source and NaI(Tl) scintillation detector were used to scan the distillation columns. The results from the two prototypes showed that all the simulated malfunctions were clearly detected except for foaming. The results from industrial distillation column showed that all the trays were in their correct position although tray number 32 could be partially damaged and just below tray 41, the scan revealed that there was a loss of column wall thickness. The obtained density profile for the industrial distillation column showed some small variations from the expected density profile and this was attributed to external features on the distillation column and wind bursts that shifted the source and detector from the chosen scan line orientation.

关键词： Gamma Photon Transport Distillation Column Malfunctions Monte Carlo Simulation

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蓝湿皮机械作用对得革率的影响

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西部皮革 2013年第2期35卷 51-54页

作者： robin Cranston Cameron simpson 杨永伟 CSIRO Australia 四川大学生物质与皮革工程系

1引文在皮革生产过程中,得革率是一个很重要的衡量参数,它是指成品革的可利用面积占生皮原始面积的比例。皮革的使用价值在于原料皮的某一部位加工后是否可以用来做特定的皮件,以满足人们的日常生活需要。而

关键词：得革率蓝湿皮削匀机制革机械机械作用厚度变化成革皮革

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