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QTM-500热线法导热系数快速测量解决方案

热线法导热系数快速测量解决方案 中国国家标准 1. GB/T 5990-2006 发布日期:2006.09.30 ,实施日期:2007.02.01 现行 耐火材料 导热系数试验方法(热线法) Refractory materials--determination of thermal conductivity--hot-wire method http://www.instrument.com.cn/netshow/SH102297/down_206672.htm 2. GB/T 10297-1998(2004) 发布日期:1998.05.08 ,实施日期:1998.12.01 现行 非金属固体材料导热系数的测定 热线法 Test method for thermal conductivity of nonmetal solid materials by hot wire method http://www.instrument.com.cn/netshow/SH102297/down_206673.htm 3. GB/T 11205-2009 发布日期:2009.04.24 ,实施日期:2009.12.01 现行 橡胶 热导率的测定 热线法 Rubber--Determination of thermal conductivity by means of hot-wire method http://www.instrument.com.cn/netshow/SH102297/down_206562.htm 具体应用: QTM-500快速导热系数测试仪测试橡胶的导热系数 http://www.instrument.com.cn/netshow/SH102297/down_204201.htm QTM-500导热系数测试仪测定陶瓷的导热系数En http://www.instrument.com.cn/netshow/SH102297/down_174393.htm QTM-500快速热导仪/导热系数测试仪测定耐火砖的导热系数En http://www.instrument.com.cn/netshow/SH102297/down_171009.htm QTM-500快速导热仪/导热系数测试仪测定聚丙烯的导热系数En http://www.instrument.com.cn/netshow/SH102297/down_171008.htm QTM-500快速导热系数测试仪测量导热硅胶薄片的导热系数 http://www.instrument.com.cn/netshow/SH102297/down_222218.htm
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上海旭风科学仪器有限公司

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调制MDSC中技术原理检测方案(差示扫描量热)

Modulated DSC (MDSC) can be easily understood by comparing it to its well-established precursor, differential scanning calorimetry (DSC). Conventional DSC is an analytical technique in which the difference in heat flow between a sample and an inert reference is measured as a function of time and temperature as both the sample and reference are subjected to a controlled environment of time, temperature, atmosphere and pressure. The schematic of a typical “heat flux” DSC cell is shown in Figure 1. In this design, a metallic disk (made of constantan alloy) is the primary means of heat transfer to and from the sample and reference. The sample, contained in a metal pan, and the reference (an empty pan) sit on raised platforms formed in the constantan disk. As heat is transferred through the disk, the differential heat flow to the sample and reference is measured by area thermocouples formed by the junction of the constantan disk and chromel wafers which cover the underside of the platforms. Chromel and alumel wires attached to the chromel wafers form thermocouples which directly measure sample temperature. Purge gas is admitted to the sample chamber through an orifice in the heating block wall midway between the raised platforms. The gas is preheated by circulation through the block before entering the sample chamber. The result is a uniform, stable thermal environment which assures excellent baseline flatness and exceptional sensitivity (signal-to-noise). In conventional DSC, the temperature regime seen by the sample and reference is linear heating or cooling at rates from as fast as 200°C/minute to rates as slow as 0°C/minute (isothermal).
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检测项: 技术原理

TA仪器

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Microscopic Measurement of Diffusion

The phenomenon of diffusion has been known for centuries. For example,the ancients who dyed fabrics certainly noticed the leading edge of their turquoise dye propagating through their cotton cloth, and biologists have long been aware of osmosis through various membranes. With our century’s advances in engineered materials, scientists and engineers are now able to design diffusive layers to provide controlled rates and selectivity of diffusion. There are a number of applications of engineered diffusion in current technology. Some are medical: drug patches allowing sustained slow release of a pharmaceutical, and membranes are used in dialysis and various laboratory separation procedures. Similar to the use of drug patches is the agricultural use of slow-release nodules to provide sustained fertilisation of soil. Industrial production of chemicals and foodstuffs often depend on separations with various membranes. Other applications are of a less organic nature, as in the separation of gases by selective diffusion through membranes, and of ions through a solid, which might be part of a battery or other electronic device. Sometimes, diffusion is an undesirable phenomenon, as when we wish to store gases dissolved in a solid, and they can diffuse out over time, or when diffusion of oxygen into a semiconductor crystal can depreciate the performance of an electronic device.
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HORIBA(中国)

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