西门子高灵敏接地保护装置的原理分析及应用

针对西门子公司生产的7SJ62系列微机保护测控装置原理进行了分析，指出其将小电流接地保护功能分散于各间隔保护单元中，符合变电站监控系统分层分布式的结构要求，具有很高的灵敏度与可靠性。     

永磁中磁场湿式筒型磁选机及其应用

介绍了YZJ型永磁中磁场湿式筒型磁选机的设备结构及技术特性。在齐大山选矿厂重-磁-浮阶段磨选工艺流程中的应用情况表明,该机除具有磁场强度大的特点外,还有磁场作用深度大,适应性强,处理能力大,选别指标好等优点。     

端羧基水性超支化聚酯促铬吸收及抗氧化的应用

将端羧基水性超支化聚酯(HBP-x)用在Cr(III)氧化实验中,证明了端羧基超支化聚酯HBP-x抑制了体系中Cr(III)向Cr(VI)的氧化,并考查了相对分子质量和支化度对HBP-x抗氧化能力的影响.在白皮粉浸酸铬鞣实验中,HBP-x起到促进铬鞣剂吸收和固定的作用.这对HBP-x用在清洁化制革中,以促铬吸收和抗铬氧...     

用GFC法研究柠檬酸盐蒙囿铝(Ⅲ)配合物的组成分布

通过凝胶过滤色谱 (GFC)对柠檬酸盐 (Cit)蒙囿的铝 (Ⅲ )配合物溶液的组分进行分离 ,用低压离子色谱(LPIC)和铬天青比色法分别测量各组分中Cit和Al3 +的含量 ,进而对溶液中各组分的分布及各组分中[Al3 +]/[Cit]值进行分析 ,为推断铝配合物的结构和Cit参与配位的方式提供了依据。     

基于氟化镁晶体微腔产生宽光谱范围克尔光频梳及色散调控研究

为了在基于回音壁模式光学微腔的光学频率梳生成中优化微腔的性能和光频梳的质量,对氟化镁晶体微腔的色散调控进行研究.首先,理论仿真研究了MgF2晶体微腔边缘形状对腔内模场和总色散的影响;接着根据仿真结果实际加工了两种面形的MgF2晶体微腔,分别为边缘平面型和单边楔形;然后,搭建了微腔性能检测系统和晶体微腔光梳生成系统,实测...     

不影响煤矿煤层开采条件下高等级公路下采煤对公路的影响及安全技术措施

在煤矿井田内新建高等级公路时,公路的建设必须要考虑煤层开采的影响,为了保证在不影响煤矿煤层开采条件下新建高等级公路的正常安全运行,需对新建高等级公路的地基稳定性进行评价,采用地表沉陷变形预计的方法,预测地表今后产生的移动变形情况并提出相应的抗变形技术措施,对新建高等级公路的可行性进行了研究,结果表明:在不影响煤矿煤层开...     

碱性分子筛催化剂上甲苯与甲烷氧化甲基化的研究

对以溴化钠为助剂的碱性分子筛ＫＹ催化剂上的甲苯与甲烷氧化甲基化合成苯乙烯和乙苯进行了研究。ＫＹ分子筛本身对甲苯的氧化甲基化的活性很代，但在添加ＮａＢｒ后其催化活性大大提高。     

Comparison of methods to identify outliers observed in health services small area variation studies

Small area variation analysis (SAV) is an established methodology in health services and epidemiological research. The goal is to demonstrate that rates differ across areas, and to explain these differences by differences in physician practice styles or patient characteristics. While the SAV statistics provide an overall variation estimate, they do not provide a statistical means to identify significant outliers. We compared the chi-square (chi2) test with three approaches in determining significant outliers in SAV. We used data from the Canadian Institute for Health Information (CIHI) for Ontario residents discharged between 1989 and 1991. Coronary artery bypass surgery, hysterectomy and hip replacement data were used to compare four statistics in determining outliers: the chi2 test, Swift's approximate bootstrap confidence interval (ABC), Carriere's T2 (T2) with simultaneous confidence intervals (SCI), and Gentleman's normalized scores (GNS). Both the ABC and SCI correct the skewness of the distribution of the adjusted rates. With large data, confidence intervals calculated by the normal or the ABC methods are indistinguishable. The T2 can be applied to also nonbinary events. For binary events, it is asymptotically the same as the chi2. The GNS ranks the rates, but the distribution of these ranks does not differ significantly from that of the adjusted rates. We concluded that when using large data with binary events, there is little advantage in using the ABC, SCI or GNS over the commonly known chi2. The chi2 remains a useful tool in small area variation analysis to 'screen' or flag potential differences beyond chance alone.     

内蒙古敖汉旗撰山子金矿矿体赋存规律及深部预测

内蒙赤峰南部众多金矿床(点)多集中在槽台过渡区的地台一边,而撰山子金矿是位于槽区(拗陷区)的代表性金矿,本文从该矿床的地质特征、岩石地球化学特征等多方面进行了论述,并探讨了成矿规律及成矿预测。     

广布疲劳损伤裂纹萌生问题研究

围绕广布疲劳损伤裂纹萌生问题研究了广布疲劳损伤裂纹萌生寿命与广布疲劳损伤出现时间的关系,以及MSD对裂纹萌生寿命的影响。给出了根据疲劳开裂情况确定的裂纹萌生寿命和损伤累积的修正计算方法,解决了MSD结构中细节疲劳裂纹萌生寿命计算问题同时计及了MSD对裂纹萌生的促进加速效果。