蓝色电工胶带的扫描电镜／能谱法检验

目的研究不同品牌蓝色电工胶带的检验方法。方法利用扫描电镜／能谱法对蓝色电工胶带进行检验。结果11个厂家生产的15种品牌的蓝色电工胶带组成的105组样品对有104组可以区分,区分率达到99．0％。结论扫描电镜／能谱法能够区分绝大多数蓝色电工胶带,该方法具有操作简便、快速、结果准确的优点,能够用于同色电工胶带的鉴别。     

扫描电子显微镜/能谱法对铊盐的检验

目的建立投毒案件中铊元素的一种快速定性检验方法。方法：在扫描电子显微镜下用背散射电子探头（BSE）观察处理后的样品,观察图像中根据元素衬度差异挑选出可能含铊元素的区域,用能谱仪做该区域的元素定性检验。结果能谱分析仪可以很快对各种元素做出准确的定性检验。结论扫描电子显微镜/能谱法对疑似铊中毒案的检验快速、灵敏、准确。     

骨砍创金属颗粒的检测

目的 应用扫描电镜/X射线能谱仪(SEM/EDX)对菜刀砍击骨质后遗留在创面上的金属微粒进行检测.方法 3种不同材质菜刀各取5把,对猪大腿骨进行砍击,使用SEM/EDX对骨创面上附着的金属颗粒元素以及菜刀自身所含元素进行定性及定量检验,并对结果进行比对分析.结果 菜刀样本同型号之间元素重量百分比相比较,结果无统计学差异(P＞0.05);创面附着金属颗粒与菜刀自身所含元素种类特征相同;其所占重量的百分比一致(P＞0.05);结论 骨骼创面遗留金属颗粒的元素种类及其百分比含量,可以作为区分菜刀类致伤工具的重要依据.     

Exploring the Government's role during COVID-19 through a newly validated scale

The present study aims to explore the perceived role of the government during this pandemic situation. The study, through the perception of general masses examine the government's role during the COVID-19 pandemic. It is believed that this is the first empirical study conducted on this issue. The study was conducted on general masses in the northern part of India. The data was collected from two states, namely, Punjab and Himachal Pradesh having different geographical and cultural base. It confirms preventive and supportive role of the government during this pandemic. The study provides a validated scale for future research on the issue under investigation. The results of this study obtained through newly validated scale can be generalised for evaluating the real performance of the government during this pandemic. Further, the government can also assess its role played at the time of this pandemic.     

实验性大鼠急性心肌缺血的组织化学和扫描电镜观察

本文报告40只大鼠结扎左冠状动脉所致实验性心肌梗死早期（缺血1～8h）的病理形态学变化。结果发现苏木素-碱性复红-苦味酸（HBFP）和吖啶橙荧光染色诊断早期心肌缺血较敏感，氯化-2，3，5-三苯基四氮唑（TTc）大体染色法显示缺血境界鲜明可靠。此三种方法不受室温（15～20℃）死后自溶12～48h的影响。酸性复红染色（AF）对早期缺血组织较敏感，但受死后自溶影响，妨碍认定缺血区。扫描电镜（SEM）观察心肌缺血改变基本与透射电镜（TEM）相同，与早期自溶改变难以区别。     

Interpreting the Effects of Burning on Pre-incineration Saw Marks in Bone

This study examined the effects of fire on the features associated with saw marks in bone. Both class and individual characteristics were examined using stereomicroscopy and scanning electron microscopy (SEM). Twenty-four semifleshed Sus scrofa L. tibiae were sawed into three sections with the middle section having deep and shallow false starts. Twelve saw blades of varying age and type were each used to cut two tibiae. In each case, the first tibia was burned in an outdoor open fire to the point of partial calcination. The second tibia, our control, was macerated using a heated enzyme solution. Controls and burned specimens were examined for the following characteristics: breakaway spur, tooth hop, false start, exit chipping, tooth imprint, breakaway notch, pull out striae, kerf flare, and blade drift. In general, there was parity in the observed characteristics in the burned samples using the SEM and the stereomicroscope. SEM observation, however, provided enhanced images, with the addition of observing individual tooth imprints, previously not visible. Therefore, this study recommends using an SEM for the examination of saw cuts in burnt bone.     

The Relationship Between the Surface Morphology and Chemical Composition of Gunshot Residue Particles

In this study, chemical composition and morphology of gunshot residue (GSR) of 9 × 19 mm Parabellum‐type MKE (Turkey)‐brand ammunition were analyzed by scanning electron microscope and energy dispersive X‐ray spectrometer. GSR samples were collected by “swab” technique from the shooter's right hand immediately after shooting. According to general principles of thermodynamics, it is likely that the structures will have a more regular (homogeneous) spherical form to minimize their surface area due to very high temperatures and pressures that occur during explosion. Studied samples were collected under the same conditions with the same original ammunition, from the same firearm and a single shooter. This is because many other variables may affect size, structure, and composition in addition to the concentrations of elements of the structure. Results indicated that the chemical compositions are effective in the formation of GSR morphological structures.     

利用扫描电镜/能谱仪和X-射线衍射仪鉴别假“冰毒”

冰毒为纯白或淡黄色结晶体,为利益所驱,很多制贩毒者利用其它外观相似的晶体充当替代品或者掺杂剂,在常规检测时,用气/质联用仪无法检验其成分。本文利用扫描电镜/能谱仪和X-射线衍射仪对外观酷似"冰毒"的晶状物成分进行检测,先利用扫描电镜/能谱仪测定未知物主要元素,再利用X-射线衍射仪测定其晶体结构和成分。两者有效结合成功地鉴别假"冰毒"物质的成分。     

利用SEM/EDS区别小口径手枪及六四式手枪在纺织品上的枪击孔

利用扫描电子显微镜和能谱仪（SEM/EDS）对小口径手枪、六四式手枪在纺织品上枪击孔洞处的附着物进行了观察分析,较好地解决了判定是小口径手枪还是六四式手枪射击问题。     

涉爆案件中烟火剂的检验

目的　建立涉爆案件中烟火剂的快速、准确的检验方法。方法　以扫描电镜 /能谱仪分析为主 ,红外光谱分析为辅 ,对爆炸装置尤其爆炸残留物中的烟火剂进行形态和成分分析。结果　对烟火剂原体的检验快速、准确 ,通过比对分析可确定烟火剂的来源 ,对爆炸残留物中的烟火剂进行准确定性。结论　该方法对各种检材中的烟火剂检验稳定性好、准确率高 ,且操作简便 ,具有很强的实用性