Particle size analysis of soils under simulated scene of crime conditions: the interest of multivariate analyses

Two simulated scenes of crime have been studied. Soil traces adhering to boots, sport shoes and tissues have been compared with control samples using particle size analysis. Comparisons of percentage of particles per class interval and multivariate analyses were used to determine how the size distribution of each suspect sample varied compared to the original distribution. A loss of coarse fractions characterized most of the suspect samples even though they were derived from soils having different distributional patterns. However, the differences between control and suspect samples were found to be more important for soils dominated by extreme size classes than for soils rich in medium size particles. The differences among soil samples from the same source were found to be restricted to the extreme size classes. The finding of significant differences within size classes ranging from 1 to 0.063 mm should be then considered as a dissimilarity sign between trace sample and hypothetic control soil.     

Reference ballistic imaging database performance

Ballistic imaging databases allow law enforcement to link recovered cartridge cases to other crime scenes and to firearms. The success of these databases has led many to propose that all firearms in circulation be entered into a reference ballistic image database (RBID). To assess the performance of an RBID, we fired 4200 cartridge cases from 600 9 mm Para Sig Sauer model P226 series pistols. Each pistol fired two Remington cartridges, one of which was imaged in the RBID, and five additional cartridges, consisting of Federal, Speer, Winchester, Wolf, and CCI brands. Randomly selected samples from the second series of Remington cartridge cases and from the five additional brands were then correlated against the RBID. Of the 32 cartridges of the same make correlated against the RBID, 72% ranked in the top 10 positions. Likewise, of the 160 cartridges of the five different brands correlated against the database, 21% ranked in the top 10 positions. Generally, the ranking position increased as the size of the RBID increased. We obtained similar results when we expanded the RBID to include firearms with the same class characteristics for breech face marks, firing pin impressions, and extractor marks. The results of our six queries against the RBID indicate that a reference ballistics image database of new guns is currently fraught with too many difficulties to be an effective and efficient law enforcement tool.     

杨绛小说中的贤妻良母形象

杨绛出于对民族传统文化和人伦道德的尊崇和切身体验,在小说中塑造出一批贤妻良母形象,着力从她们身上发掘出流传久远的贤良美德,并以她们的人性美、人情美映照出周围可笑可讽的人和事.这些人物形象不仅能给人以美感和道德启示,还填补了文学史上的某些缺憾.     

宗法宗族制度下明清时期的妇女婚姻生活

明清时期,宗法宗族制度对妇女婚姻生活的消极作用比较大,主要在婚前剥夺女子受教育权利;婚约的缔结主要从宗族利益考虑;婚后生活受到夫权、族权的严格控制;强迫妇女守节等方面有所表现.积极作用主要表现为提倡男婚女嫁轻钱财,重人品;反对索取重聘厚奁,嫌贫易富,操办奢靡,讲求排场等陋俗;严禁溺杀女婴.     

论高校文化冲突与精神文明建设

改革开放给我们的精神文明提出了新的课题,高校精神文明建设也面临着复杂的文化冲突,像公私问题、义利问题、中西问题、古今问题、内外问题、知行问题等等,但我们对这些问题一直认识、研究、解决不够.要建设高校科学的精神文明结构,我们就必须从目标论、方法论、实践论3个层次上把握文化冲突,并将这3个层次贯穿于精神文明建设的整个过程中,一层层地进行分析和构建,把握每一层次的规律,探寻科学的方法,解决冲突问题.     

Toxicological findings in deaths due to ingestion of pentazocine: A report of two cases

Two cases of fatal suicidal ingestion of pentazocine are presented. Toxicological findings in these deaths are compared to those of twelve similar pentazocine fatalities gleaned from various compilation of toxicology data. Pentazocine blood and liver concentrations in the presented cases were 3.3 and 9.2 mg/l, and 34 and 43 mg/kg, respectively. Blood and liver concentrations in references cases ranged from 0.8 – 38 mg/l and 3 – 197 mg/kg, respectively. The interpretation of toxicology findings following the ingestion of pentazocine is discussed.     

The GC–MS detection and characterization of reticuline as a marker of opium use

Reticuline (a precursor of opium alkaloids) was detected and characterised as its trimethylsilyl ethers, acetyl esters and methyl ethers by GC–EIMS and GC–CIMS in opium and the urine of opium users after hydrolysis by acid or β-glucuronidase as coextractive of morphine. Because this compound cannot be detected in heroin and poppy seeds, it is suggested as a differentiating marker between opium and heroin use, opium and poppy seeds use, or opium and “pharmaceutical” codeine use in cases when opiate use has been confirmed by detection of morphine and codeine in the urine. As well as being a constituent of opium, reticuline in the urine of opium users may also result from the metabolic demethylation of the three other benzyltetrahydroisoquinoline opium alkaloids: codamine, laudanosine and laudanine.     

关于高校图书馆在教学改革中的定位思考

在高校的教学改革中,图书馆发挥着重要的作用.它是教学改革的信息资源宝库,是培养具有创新能力的复合型人才的重要场所,是使学生学会学习全面发展的最佳园地.     

浅谈班级管理中的素质教育

素质教育是21世纪中国教育改革的最迫切的任务.班级管理工作是高校教育工作的重要组成部分,也是实施素质教育的重要领域.结合当代大学生的特点在班级管理中进行素质教育应加强学生的思想品德修养,建构学生的学科能力,培养学生创造性的人格,激发其非智力因素,做学生的心理保健医生.     

以邓小平理论为指导拓展高校思想教育新视角

进入新世纪,高校思想教育工作正面临着十分复杂的局面和繁重的任务.做好新形势下高校的思想教育工作,必须坚定不移地以邓小平理论为指导,不断拓展高校思想政治教育的新视角要不断增加高校思想政治工作的知识含量;要不断扩大思想政治工作的信息含量;要正确把握高校思想政治工作的超前性.