Optimized Development of Sebaceous Fingermarks on Nonporous Substrates with Conformal Columnar Thin Films

A form of physical vapor deposition, called the conformal‐evaporated‐film‐by‐rotation (CEFR) method, was optimized for the conformal deposition of columnar thin films (CTFs) on sebaceous fingermarks. Relying on the surface topology of the fingermark, the CTF development technique is different from traditional development techniques. After the optimization of the development conditions, the CTF development technique was found to be superior to traditional development methods on several nonporous substrates: the smooth side of Scotch^® Multitask, Gorilla^®, and Scotch^® Duct tapes; clear and black soft plastics; stained and sealed walnut and cherry woods; partial bloody fingermarks on stainless steel; and discharged cartridge casings. It was equally as good as other development techniques on other substrates, but worse on a few. The optimization study is expected to assist in designing a mobile CEFR apparatus capable of on‐scene development of fingermarks.     

A Simple Solubility Tests for the Discrimination of Acrylic and Modacrylic Fibers

In a crime scene investigation, single fibers play an important role as significant trace physical evidence. Acrylic fibers are frequently encountered in forensic analysis. Currently, acrylic and modacrylic are not discriminated clearly in Japan. Only results of FT‐IR, some of acrylics were difficult to separate clearly to acrylic and modacrylic fibers. Solubility test is primitive but convenient useful method, and Japan Industrial Standards (JIS) recommends FT‐IR and solubility test to distinguish acrylic and modacrylic fibers. But recommended JIS dissolving test using 100% N,N‐dimethylformamide (DMF) as a solvent, some acrylics could not be discriminated. In this report, we used DMF and ethanol (90:10, v/v) solvent. The JIS method could not discriminate 6 acrylics in 60 acrylics; hence, DMF and ethanol (90:10, v/v) solvent discriminated 59 of the 60 fibers (43 acrylic and 16 modacrylic fibers) clearly, but only one modacrylic fiber incorrectly identified as acrylic.     

警察体育训练中风险预警机制的研究

从组织结构和系统结构两方面对警体训练中风险预警机制进行分析,构建出警体训练的组织构架和预警系统过程,以期处理好训练中提高警务素质与减少非战斗性自我减员或削弱之间的契合,为警察体育训练中风险预警机制的构建提供新的思维视角。     

警察警体素质“六能力”概念与内涵研究

警察院校实施多年的警体教学内容体系已很不适应当前公安一线的实际需要。对警察警体素质“六能力”概念与内涵的重新认识,可以摆正科学研究与教学改革的方向,从而更为科学地去调整警体教学内容体系。建设合乎新时期公安一线需要的教学内容体系是当前严峻的社会治安形势的需要。     

大学生体育意识与终生体育观培养

随着全面推进大学体育素质教育的深入,终生体育的思想将成为方向。高校体育要从多方面激发和培养学生对体育锻炼的兴趣和习惯,使学生通过在校期间的体育锻炼,形成终身体育锻炼的意识和习惯。体育教师要通过教学,在潜移默化中促进学生终身体育意识的形成。