Computer Automated Tomography has been shown to be a valuable tool in production research because it provides a non-destructive method to identify and evaluate the internal structural characteristics of reservoir rock...Computer Automated Tomography has been shown to be a valuable tool in production research because it provides a non-destructive method to identify and evaluate the internal structural characteristics of reservoir rock. In CT scan, Hounsfield Unit (HU) is proportional to the degree of X-ray attenuation by the tissue. The aim of the present study was to introduce the method to estimate porosity which is one of physical parameters of reservoir rock though HU data. In this study, an Image J software was used to extract Hounsfield Unit data and calibrate by standard material’s density. This method provides the ability of using CT Scanner in advanced reservoir characterization and flow test experiments.展开更多
Differential scanning calorimetry (DSC) provides easy screening for thermal hazard evaluation. Here, we investigate the difference between using glass and stainless-steel vessels on the DSC measurement of exothermic d...Differential scanning calorimetry (DSC) provides easy screening for thermal hazard evaluation. Here, we investigate the difference between using glass and stainless-steel vessels on the DSC measurement of exothermic decomposition energy (QDSC) for 41 chemical substances (containing nitro, halogen, peroxide, and sulfur groups, and hydrazine bonds). Two borosilicate glass vessels (capillary and ampule) and one stainless-steel vessel were used. All QDSC values obtained were investigated with reference to the permissible fluctuation range specified by the ASTM (American Society for Testing and Materials) international Both glass vessels produced very similar QDSC values, despite different sample scales. The QDSC values obtained with the glass vessels were generally roughly within the variation tolerance range of the stainless-steel vessel. Notable exceptions were halogen- or sulfur-containing compounds;these exhibited smaller QDSC values with glass vessels in almost all cases. We will investigate whether certain structures in compounds react with stainless steel. The vessel material choice is crucial in evaluating the true reactivity of a substance.展开更多
针对集成电路中差分信号的差分电压和共模电压采用固定输出状态测试,信号的频率采用脉冲计数法测试,由于差分电压与频率需分别测试,导致测试效率偏低,且操作较繁琐、人为引入的不确定性较大,测试方法与数据不可溯源,不适合批量筛选测试...针对集成电路中差分信号的差分电压和共模电压采用固定输出状态测试,信号的频率采用脉冲计数法测试,由于差分电压与频率需分别测试,导致测试效率偏低,且操作较繁琐、人为引入的不确定性较大,测试方法与数据不可溯源,不适合批量筛选测试。为此,提出了一种基于自动化测试系统(Automatic Test Equipment,ATE)中时间测量单元(Time Measurement Unit,TMU)的扫描测试方法,TMU通过测量信号相同幅值两点间的时间差计算得到频率,同时采用扫描法得到差分信号幅值的极值,进而得到差分电压和共模电压。通过对时钟恢复器的测试实验,验证了测试结果与差分信号的实际波形一致,满足器件的性能指标,表明该测试方法稳定可靠、效率高、自动化程度高、可溯源性强,可广泛应用于集成电路的批量测试中。展开更多
文摘Computer Automated Tomography has been shown to be a valuable tool in production research because it provides a non-destructive method to identify and evaluate the internal structural characteristics of reservoir rock. In CT scan, Hounsfield Unit (HU) is proportional to the degree of X-ray attenuation by the tissue. The aim of the present study was to introduce the method to estimate porosity which is one of physical parameters of reservoir rock though HU data. In this study, an Image J software was used to extract Hounsfield Unit data and calibrate by standard material’s density. This method provides the ability of using CT Scanner in advanced reservoir characterization and flow test experiments.
文摘Differential scanning calorimetry (DSC) provides easy screening for thermal hazard evaluation. Here, we investigate the difference between using glass and stainless-steel vessels on the DSC measurement of exothermic decomposition energy (QDSC) for 41 chemical substances (containing nitro, halogen, peroxide, and sulfur groups, and hydrazine bonds). Two borosilicate glass vessels (capillary and ampule) and one stainless-steel vessel were used. All QDSC values obtained were investigated with reference to the permissible fluctuation range specified by the ASTM (American Society for Testing and Materials) international Both glass vessels produced very similar QDSC values, despite different sample scales. The QDSC values obtained with the glass vessels were generally roughly within the variation tolerance range of the stainless-steel vessel. Notable exceptions were halogen- or sulfur-containing compounds;these exhibited smaller QDSC values with glass vessels in almost all cases. We will investigate whether certain structures in compounds react with stainless steel. The vessel material choice is crucial in evaluating the true reactivity of a substance.
文摘针对集成电路中差分信号的差分电压和共模电压采用固定输出状态测试,信号的频率采用脉冲计数法测试,由于差分电压与频率需分别测试,导致测试效率偏低,且操作较繁琐、人为引入的不确定性较大,测试方法与数据不可溯源,不适合批量筛选测试。为此,提出了一种基于自动化测试系统(Automatic Test Equipment,ATE)中时间测量单元(Time Measurement Unit,TMU)的扫描测试方法,TMU通过测量信号相同幅值两点间的时间差计算得到频率,同时采用扫描法得到差分信号幅值的极值,进而得到差分电压和共模电压。通过对时钟恢复器的测试实验,验证了测试结果与差分信号的实际波形一致,满足器件的性能指标,表明该测试方法稳定可靠、效率高、自动化程度高、可溯源性强,可广泛应用于集成电路的批量测试中。
