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真空热电子-热光伏耦合发电器件性能研究
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作者 王国轩 肖刚 《热力发电》 CAS CSCD 北大核心 2021年第10期47-52,77,共7页
提出了一种真空热电子-热光伏耦合发电器件,基于能量平衡方程建立了真空热电子-热光伏耦合发电器件的理论模型,获得了器件输出功率和转换效率的一般表达式,并确定了器件的优化参数,研究了热源温度和极板功函数对耦合发电器件输出电压、... 提出了一种真空热电子-热光伏耦合发电器件,基于能量平衡方程建立了真空热电子-热光伏耦合发电器件的理论模型,获得了器件输出功率和转换效率的一般表达式,并确定了器件的优化参数,研究了热源温度和极板功函数对耦合发电器件输出电压、功率和效率的影响规律。结果表明:优化参数后,该耦合发电器件的最高转换效率可达24.3%,较单独的真空热电子发电装置提高了6.9百分点,其最优输出功率约为后者的3.5倍;耦合热光伏模块后的器件在不同参数下都能实现输出稳定,提高热源温度或降低阳极功函数可进一步提升器件性能。本文将为适用于太阳能或核能的热电子复合发电技术研发提供有益参考。 展开更多
关键词 热电子能量转换器 热光伏电池 耦合发电器件 能量平衡 性能分析
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Automatic Assessment of Fabric Smoothness Grade Using Double CCD Grating Projection
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作者 陈慧敏 张渭源 顾洪波 《Journal of Donghua University(English Edition)》 EI CAS 2007年第5期614-618,共5页
Automatically assessing fabric smoothness grade is very important in the evaluation of fabric appearance.A system for objectively evaluating the fabric smoothness grade based on a grating projection unit and double co... Automatically assessing fabric smoothness grade is very important in the evaluation of fabric appearance.A system for objectively evaluating the fabric smoothness grade based on a grating projection unit and double colored CCD(short form of charge coupled device) was constructed in this paper.Two images captured by different CCD compensated each other which reduced the influence of noises.The application of the four-step phase-shifting method enabled the calculation of the exact phase in a point easy and quick.A large amount of 3D points with three coordinates X,Y and Z were obtained precisely making the definition and calculation of fabric smoothness characters easy.Then four parameters which intuitively denoted the fabric smoothness degree were obtained.Finally,a proper neural network was built,which successfully performed the fabric smoothness classification.The experimental results show that the system is applicable for all the fabric whatever pattern or color.The experimental grades provided by this grating projection system are also highly consistent with the subjective results. 展开更多
关键词 smoothness grade FABRIC grating projection double CCD
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Three Cases of Familial Clavicular Hypoplasia
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作者 Hui Ye Lian-jia Li 《Journal of Pharmacy and Pharmacology》 2018年第5期547-550,共4页
CCD (cleidocranial dysplasia) is a kind of rare congenital skeletal dysplasia and deformity. It has rare clinical syndrome, such as forehead radius, small maxilla ofa cial, wide long distance eye, collapse nose, wid... CCD (cleidocranial dysplasia) is a kind of rare congenital skeletal dysplasia and deformity. It has rare clinical syndrome, such as forehead radius, small maxilla ofa cial, wide long distance eye, collapse nose, widening cranial suture, incompleted closure of the frontal, clavicle hypoplasia, increased range of shoulder motion and other abnormalities. Often accompanied by teeth hypoplasia or impacted, through a careful observation of the clinical morphology, case history and X-ray examination can confirm the diagnosis. 展开更多
关键词 SKULL clavicular hypoplasia.
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