zem- meaning in English
土地
Examples
- In this paper , firstly , monolithic materials cosb3 and bi2te3 were prepared by sparkle plasma sintering ( sps ) respectively , and at the same time the microstructure of cosb3 and bi2te3 were studied by sem ; the seebeck coefficients and electrical conductivities of monolithic materials were measured by standard - four - probe method ( ulvac zem - 700 ) in a he atmosphere simultaneously , and their thermal conductivities were investigated by laser flash method ( tc - 7000 ) in vacuum . secondly , the junction temperature of graded bi2te3 / cosb3 thermoelectric materials was optimized based on the thermoelectric transport properties of monolithic materials , also when graded materials were used in the temperature difference ranging from 300k to 800k , the length ratio of monolithic materials cosb3 and bi2te3 were optimized in theory . thirdly , graded bi2te3 / cosb3 thermoelectric materials were prepared by two - step sps sintering , and the relationship between its average seebeck coefficients and temperature were calculated by theory mo del
均质材料cosb _ 3和bi _ 2te _ 3的电导率和seebeck系数采用标准四端子法于he气氛下在zem - 1上同时进行测量；热导率采用激光微扰法( tc - 7000 )于真空状态下进行测量；其次，在对均质材料cosb _ 3和bi _ 2te _ 3热电传输特性研究的基础上，对结构梯度bi _ 2te _ 3 cosb _ 3热电材料的界面温度进行了优化；为了使结构梯度bi _ 2te _ 3 cosb _ 3热电材料在300k至800k的温度范围内具有最佳的热电性能，本研究同时对梯度结构热电材料当中均质材料cosb _ 3和bi _ 2te _ 3材料的长度进行了优化设计；第三，通过两步放电等离子烧结的方法制备出了结构梯度bi _ 2te _ 3 cosb _ 3热电材料；采用理论计算的方法研究了梯度结构热电材料平均seebeck系数和温度的关系；同时为了验证设计的结果，本论文对结构梯度bi _ 2te _ 3 cosb _ 3热电材料的开路输出电压和热端温度之间的关系及梯度材料在300k至800k的温度范围内使用时的功率输出进行了相应的研究。