共查询到19条相似文献,搜索用时 109 毫秒
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介绍了使用气体比热容比测定仪测定气体比热容比实验教学的指导要点、故障排除方法;分析了测定气体比热容比的误差来源;并对与该实验有关的一些问题作了简要说明。 相似文献
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指出在改进探究物质的比热容实验过程中一个常见的错误,该实验采用水浴法加热存在缺陷,使用DISLab传感器对该实验水浴法加热过程进行实验验证,发现其实验结果并不理想,对比红外辐射加热,对水浴法加热失败原因进行了分析. 相似文献
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混合法测定物质的比热容实验的方法:首先将被测物的质量进行测量,然后把被测物放入水中加热并测量其温度;测量量热器中水的质量,并测出其温度;再把高温被测物放进量热器中搅拌,测量出混合后的终温;然后根据比热容公式计算出被测物的比热容.然而学生实验中发现测量值始终小于理论值,这是由于整个实验过程损失了较多的热量.那么如何减小误差,本文对此提加以探讨. 相似文献
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This paper discusses the influence of the finite pulse-time effect simultaneously acting with the effect of heat source capacity, the effect of thermometer heat capacity and the effect of inertia of measuring apparatus on the accuracy of a pulse method. Further on, the relations for the maximal and effective temperature of a sample are derived. The above effects are examined separately, which allows setting some useful criterions for neglecting these effects. The results of numerical calculations are presented also graphically. 相似文献
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Determining the thermophysical properties of Al-doped ZnO nanoparticles by the photoacoustic technique
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The thermal conductivity and specific heat capacity of undoped and Al-doped (1-10 at.%) ZnO nanoparticles prepared using the solvent thermal method are determined by measuring both thermal diffusivity and thermal effusivity of a pressed powder compact of the prepared nanoparticles by using the laser-induced photoacoustic technique. The impact of Al doping versus the microstructure of the samples on such thermal parameters has been investigated. The results reveal an obvious enhancement in the specific heat capacity when decreasing the particle size, while the effect of Al doping on the specific heat capacity is minor. The measured thermal conductivities are about one order of magnitude smaller than that of the bulk ZnO due to several nested reducing heat transfer mechanisms. The results also show that Al doping significantly influences the thermal resistance. Using a simple thermal impedance model, the added thermal resistance due to Al dopant has been estimated. 相似文献
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设计了一套温控系统,用在金属有机骨架(MOFs)材料低温储氢性能测试装置上.测试装置以循环液氮作为冷源.根据测试装置内的温度信号,温控系统利用PID温控仪,并结合继电器对加热丝的加热量进行调节,满足测试装置所需的温度范围,并能恒定在某一测试温度下.所设计的温控系统可以实现低温宽温区范围内的连续调节,且系统简单、操作方便... 相似文献
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A. I. Savvatimskiy 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(4):359-362
Results are considered from pulse experiments on measuring the heat capacity of conductive solids near the melting point. Increased heat capacity that falls to equilibrium values after transitioning to the liquid phase is observed prior to melting in nearly all experiments. It is assumed the reason for this increased heat capacity is the emergence of nonequilibrium pair Frenkel defects upon pulsed heating. 相似文献
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差分比热实验方法是测量两个样品的比热差,具有高达万分之一的比热测量分辨率,适合测量相变时微小的比热变化及宽温区的电子比热.文章介绍了高分辨连续升温差分比热实验的测量原理和测量方法,并以铜氧化物高温超导体Y0.8Ca0.2Ba2Cu3O6+x为例,介绍了差分比热实验手段在宽温区电子比热的获得、正常态赝能隙及超导凝聚能研究等方面的应用. 相似文献