No C结构规模巨大,内部电路互连非常复杂,No C内部串扰严重影响了片上系统的信号完整性。基于改进HT模型提出一种串扰测试的方法,实验结果表明,在改进的HT模型来中,N根传输线传统串扰测试方法需要测试6N次,而此方法只需要18次,从而有效...No C结构规模巨大,内部电路互连非常复杂,No C内部串扰严重影响了片上系统的信号完整性。基于改进HT模型提出一种串扰测试的方法,实验结果表明,在改进的HT模型来中,N根传输线传统串扰测试方法需要测试6N次,而此方法只需要18次,从而有效地减小了开销。基于改进的HT故障种类模型设计了一套基于改进HT模型的测试代码,根据测试代码利用Pspice仿真软件设计了一种测试代码电路,该测试电路是利用16位数据选择器和16进制计数器构成,并对测试电路进行仿真测试,测试结果表明该电路能够满足测试要求并且具有可移植的优点。展开更多
The changes of grindability, grading and wettability of recycled plaster(R-P)and the mechanisms of these changes were studied by using vickers hardness, particle size distribution(PSD), scanning electron microscope(SE...The changes of grindability, grading and wettability of recycled plaster(R-P)and the mechanisms of these changes were studied by using vickers hardness, particle size distribution(PSD), scanning electron microscope(SEM) and nitrogen adsorption porosimetry to reveal that R-P was obviously different from plaster of Paris(POP). At the same milling time, R-P had the characteristics of high specific surface area, fine particle diameter and uneven size distribution compared with POP, so R-P possessed both good grindability and poor grading. The water absorption, dissolution rate and mass loss in dry-wet cycle of the hardened recycled gypsum(hardened RG) increased, while the water saturated strength and dry-wet cycle strength decreased significantly compared with the hardened virgin gypsum(hardened VG). Therefore, poor wettability could be seen in R-P. The analyses indicated that the changes of grindability and grading could be attributed to the reduction in hardness and the increase in the porosity of hardened RG and that the poor wettability of R-P was caused by the increase of large pores and the changes of microstructure of hardened RG.展开更多
基金Supported by the National Natural Science Foundation of China(No.50872160)
文摘The changes of grindability, grading and wettability of recycled plaster(R-P)and the mechanisms of these changes were studied by using vickers hardness, particle size distribution(PSD), scanning electron microscope(SEM) and nitrogen adsorption porosimetry to reveal that R-P was obviously different from plaster of Paris(POP). At the same milling time, R-P had the characteristics of high specific surface area, fine particle diameter and uneven size distribution compared with POP, so R-P possessed both good grindability and poor grading. The water absorption, dissolution rate and mass loss in dry-wet cycle of the hardened recycled gypsum(hardened RG) increased, while the water saturated strength and dry-wet cycle strength decreased significantly compared with the hardened virgin gypsum(hardened VG). Therefore, poor wettability could be seen in R-P. The analyses indicated that the changes of grindability and grading could be attributed to the reduction in hardness and the increase in the porosity of hardened RG and that the poor wettability of R-P was caused by the increase of large pores and the changes of microstructure of hardened RG.
