It Takes a Village: Protecting Rural African American Youth in the Context of Racism

Prior research demonstrates negative consequences of racism, however, little is known about community, parenting, and intrapersonal mechanisms that protect youth. Using a mixed-methods approach, this study illuminated linkages between positive and negative contextual influences on rural African American adolescent outcomes. Quantitative results provide support for Structural Ecosystems Theory, in that the influence of discrimination and collective socialization on adolescent outcomes was mediated by racial socialization and positive parenting. Parenting and community influences contributed to adolescent racial identity and self image, which protected against common negative responses to racism; including academic underachievement, succumbing to peer pressure, and aggressive tendencies. Qualitative results indicate that current measures of discrimination may underestimate adolescents’ experiences. Adolescents reported racist experiences in the domains of school, peers, and with the police (males only). Moreover, qualitative findings echoed and expanded quantitative results with respect to the importance of the protective nature of parents and communities.

Nationalism in the USSR: a historical and comparative perspective

The late 1980s and early 1990s were characterized by the sudden rise of nationalist movements in almost all Soviet ethnic regions. It is argued that the rise of political nationalism since the late 1980s can be explained by the development of cultural nationalism in the previous decades, as an unintended outcome of Communist nationalities policy. All ethnic regions are examined throughout the entire history of the USSR (49 regions, 1917–1991), using the structural equation modeling (SEM) approach. This paper aims to make at least three contributions to the field. First, it is a methodological contribution for studying nationalism: a “quantification of history” approach. Having constructed variables from historical data, I use conventional statistical methods such as SEM. Second, this paper contributes to the theoretical debate about the role of cultural autonomy in multiethnic states. Finally, the paper statistically proves that the break between early Soviet and Stalinist nationalities policy explains the entire Soviet nationalities policy.     

Gunshot residues on dry bone after decomposition-a pilot study

Abstract: Very little literature exists concerning radiochemical and microscopic analyses of gunshot wounds in decomposed material, and even less concerning skeletonized samples; the most advanced technologies may provide useful indications for the diagnosis of suspect lesions, especially if gunshot wounds are no longer recognizable. However, we know very little of the survival of gunshot residues (GSR) in skeletonized samples. This study examined nine gunshot wounds produced on pig heads which then underwent skeletonization for 4 years, and four gunshot entries on human heads from judicial cases which were then macerated to the bone in water; the samples underwent scanning electron microscopy coupled with energy dispersive X‐ray (SEM‐EDX) analysis. Positive results for GSR were observed only in four of the nine animal samples and in all four human samples. Among the human samples, two lesions showed Pb and Sb, one lesion only Pb, and one Pb, Sb, and Ba. This pilot study showed the survival of GSR in skeletal material and therefore the crucial importance of SEM‐EDX analyses on skeletonized material. Further studies are needed in order to ascertain the role of environmental modifications of GSR.     

中国高等教育顾客满意度指数模型的构建

办人民满意的教育是我国高等教育的宗旨,对高等教育质量进行评估是受教育者的权利.根据我国高等学校的具体情况,在借鉴美国顾客满意度指数模型(ACSI)的基础上,尝试建立了由高校形象、顾客期望、感知质量、顾客满意、顾客忠诚和顾客信任等结构变量构成的中国高等教育顾客满意度指数模型(CHE-CSI).依据顾客满意度测量理论,设计了包括自我发展、专业课程设置、教师队伍、教学质量、图书馆、文娱活动和校园服务等质量因子和通行的满意度测量因子的指标体系,并编制了相应的问卷.总量表信度达到0.8999.因子分析表明,学生对高校教育质量的感知主要包括教学质量和校园服务两个方面.利用结构方程分析软件LISREL8.7对沈阳市六所高校的596名学生样本数据进行了模型验证分析.各项拟合系数均表明数据与模型拟合良好,其中RMSEA达到0.064.     

应用SEM/EDX检测皮肤上腐蚀物质元素

在某些凶杀案件中,犯罪分子为掩藏其罪行,用强酸、强碱对尸体进行毁容,然后抛尸的现象屡有发生。为确定尸源、寻找侦查线索,侦技人员必须确定毁容物质的种类或品种。但有关这方面的文献报道较少,通常是法医工作者依据经验,通过观察灼伤皮肤的形态、颜色等做出大致判断,对案件侦破提供线索或证据受到一定局限。本文应用扫描电子显微镜/能谱仪(SEM/EDX)对4种强酸、强碱腐蚀猪皮表面进行测试,通过检测皮肤上腐蚀物质的特征元素(如S,Cl,Na,K等)来推断腐蚀物质的类型,以期建立一种简便、有效的理化检验方法,为实际办案判断毁容物质类型提供信…     

电击兔肢体所致骨损伤后的实验性研究

目的220V交流电击兔肢体后,观察电击部位骨表面的病理改变,为法医病理诊断电击伤提供客观、量化的指标。方法用220V交流电作为损伤电压。动物分为:生前电击组、死后5m in电击组、腐败组及正常对照组。每组骨骼标本均进行肉眼检察、X线检测及SEM观察;同时运用能谱仪测量电击部位元素的种类及含量。结果①电击部位骨皮质SEM下骨皮质紊乱、小孔穴形成、周围高密度影环绕,且钙、磷元素升高,碳元素下降是诊断电击伤的指标,并能鉴别生前、死后电击伤及腐败骨。②小孔穴的形态及钙、磷、碳元素的变化可用于推断电击时间。结论电击造成骨组织的形态及电击部位元素的改变可作为鉴别生前、死后电击伤、腐败骨和推断电击时间的指标。     

GSR2005—Continuity of the ENFSI Proficiency Test on Identification of GSR by SEM/EDX

Abstract:  Within the framework of the ENFSI Expert Working Group "Firearms" a proficiency test on the detection and identification of GSR by energy-dispersive scanning electron microanalysis (SEM/EDX) is carried out in a 2 years term. The latest test was performed in 2005/2006 and was denoted as GSR2005 . Seventy-five laboratories from 28 countries participated in this proficiency test and submitted in total 83 independent data-sets. The participating laboratories were requested to determine the total number of PbSbBa containing particles on a synthetic test sample following their own laboratory specific methods of automated GSR particle search and detection by SEM/EDX. Furthermore size and position of the detected particles had to be reported by the laboratories and were evaluated statistically. The results were compiled by means of z -scores according to the IUPAC and EURACHEM guidelines—assessing individual laboratory achievements (inter-laboratory) as well as intra-laboratory performance—and were compared to the results of the previous proficiency test run GSR2003 ( 1 ). The comparison shows that there is a noticeable improvement in the method's detection capability.     

Transfer and Distribution of Gunshot Residue through Glass Windows

Research into the deposition patterns of primer gunshot residue (GSR) beyond a primary target was previously nonexistent. This study aimed to determine the deposition patterns of GSR once a bullet passed through an initial target and continued on its path into additional targets. Multiple repetitions were performed to assess the GSR deposition patterns after a bullet was shot through a closed window into either a dummy or a wall within an enclosed room. Samples were taken from both the primary and secondary target holes as well as from nontarget areas. Significant amounts of GSR were found on all samples. The results show that GSR continues to be deposited along the path of the bullet after passing through a primary glass target. These findings reiterate the lack of probative value in collecting GSR samples from gunshot victims even if they are in an enclosed area separate from the shooter.     

SEM检验漆膜厚度鉴别同种颜色的汽车油漆

目的研究扫描电子显微镜测量漆膜厚度的方法对颜色相近的汽车油漆的区分能力。方法应用扫描电子显微镜对不同汽车厂家生产的12块蓝色油漆进行总厚度及分层厚度测量,并对所得数据进行t检验分析。结果在所有两两比对的66组样品对中,在置信度为95％时,用总厚度及分层厚度进行区分,区分率达到100％。结论用扫描电子显微镜微观测量油漆样品总厚度及分层厚度的方法,可对颜色相近的汽车油漆进行有效区分。     

扫描电镜/能谱法对92式手枪射击残留物检出率与遗留时间相关性的研究

目的研究92式手枪射击残留物检出率与遗留时间的相关性,为射击时间的推断提供依据。方法实验人员使用92式手枪分别射击1枪和3枪,射击后分别在0.5h内,24h,48h,72h,120h,168h,对实验人员的手部及衣袖袖口处进行射击残留物的提取,利用扫描电镜和能谱仪对射击残留物进行检验。结果射击人的手部和衣袖会附着大量的射击残留物,随着时间的推移,手部的残留物数量急剧减少,24h（射击1枪）、72h（射击3枪）后不能检测到枪击残留物。而衣袖处120h（射击1枪）、168h（射击3枪）内均可检测到射击残留物,且射击残留物的检出率与遗留时间呈负相关性。结论随着遗留时间的增加,衣袖处射击残留物检出率递减,对涉枪案件中射击时间的判断有一定的参考价值。