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颗粒测量的现代方法

发布时间:2018/08/20 17:23 下载:191 次 免费下载
FINE PARTICLE TECHNOLOGY Since prehistory man has been aware of the importance of particle size in producing resources and wares with desired properties. Archeological evidence indicates that paints used for cave wall paintings are mixtures of finely pulverized pigmenting materials, predominantly carbon, ochre and hematite. Man came to realize that adding pulverized materials to clay not only improved its workability, but improved the drying process, reduced shrinkage and changed the characteristics of the resulting vessels. There also is evidence of using particles of certain sizes to control porosity. For many centuries, finely divided, calcined lime powder or gypsum mixed with sand was used in plasters and binders. Then, about 2000 years ago, the Romans improved upon the formula by adding volcanic (pozzolanic) ash, which produced a superior hydraulic cement that was used in building many structures that still stand
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1.按压力表测试模式 开始测试前,歧管和样品管间的隔离阀处于关闭状态。随后在歧管中充入一定量的气体,预计这些气体能够使系统达到指定的第一点压力。稳定后打开隔
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