高效液相色谱法测定山茱萸中熊果酸与齐墩果酸的含量

目的 采用高效液相色谱法同时测定山茱萸中熊果酸与齐墩果酸的含量,为山茱萸的质量控制提供依据。方法 Diamonsil-C18色谱柱（4.6 mm×250 mm,5 μm）,流动相为甲醇-（水∶冰乙酸∶三乙胺（30∶0.1∶0.05））（88∶12）,柱温25 ℃,流速1.0 ml/min,进样量20 μl,检测波长为210 nm。结果 熊果酸在0.031 5～0.315 mg/ml,齐墩果酸在0.015 6～0.156 mg/ml的浓度范围内与峰面积呈良好的线性关系;熊果酸和齐墩果酸的平均回收率分别为97.53%、100.08%,RSD分别为1.28%、1.98%。结论 本法操作简单,重复性好,结果准确可靠,可用于山茱萸的质量控制。     

“MORE OF A STREET COP THAN A DETECTIVE”: AN ANALYSIS OF THE ROLES AND FUNCTIONS OF PARENTING COORDINATORS IN NORTH CAROLINA

This research project examined roles and functions of parenting coordinators (PCs) identified by AFCC's Guidelines for Parenting Coordination and other literature. The researcher used a semi‐structured interview schedule that included information about practices, procedures, and a series of five case‐based vignettes that contained commonly occurring ethical and legal dilemmas in PC practice. The results found that PCs generally saw their role as enforcers of existing orders and primarily used skills in conflict management, parent education, and information coordination with other professionals. PCs would use arbitration powers to make minor decisions or refer to court as a last resort.     

公共管理视阈下的城市高房价问题研究

高房价是当前我国房地产市场最突出的特征。文章从公共管理视角关注政府性因素对于房价的推动作用,如地方政府＂土地财政＂、GDP导向的地方政府政绩考核机制、房地产腐败和房地产市场政府监管职能缺失。对房地产市场的调控应在采取相应的经济对策的同时,采取稳妥有效的公共管理策略。明确中央和地方的事权财权,改变＂土地财政＂;建立地方政府住房问题考核问责机制;坚决清除房价中的＂腐败成本＂;加强政府监管,抑制房地产投机行为。     

Context Matters: Reactive and Proactive Bystander Action to Prevent Sexual and Dating Violence in High Schools

ABSTRACT

Given high rates of relationship violence among adolescents, there is a need to understand variables that influence adolescents’ helping behaviors to reduce risk for dating and sexual violence (reactive) and promote prevention before violence happens or risk factors are evident (proactive). The current paper examined individual and school variables related to greater actionism in a large sample of high school students. Baseline, cross-sectional data used in the current analyses were gathered before intervention as part of a prevention program evaluation across 25 high schools in New England from students in grades 9–12 (N= 3,404). Students who self-reported a greater number of proactive actions taken were students who identified as sexual minorities, had a history of victimization, and were in schools with supportive peer norms. The current findings suggest a model for prevention that might include training individuals and attending to school level variables.     

Longer Term Impact of Bystander Training to Reduce Violence Acceptance and Sexism

ABSTRACT

Many bystander programs to prevent violence have been developed and evaluated in college populations. An exception is the randomized controlled trial of Green Dot, found effective in reducing violence rates and violence acceptance in 26 high-schools (2010–2014). In ‘Life’s Snapshot’, 10,727 seniors were recruited from these same schools with the goal of determining the longer-term efficacy of bystander training. Students in intervention schools could have up to three years of Green Dot exposure. Seniors from intervention versus control schools had significantly lower scores (p <.01) indicating less violence acceptance or sexism for two of five measures. Seniors’ self-reports of bystander training received confirmed these findings. These cross-sectional analyses suggest that some reductions in violence acceptance associated with bystander programming may be maintained into early adulthood.     

Characterization and dating of blue ballpoint pen inks using principal component analysis of UV-Vis absorption spectra, IR spectroscopy, and HPTLC

The ink of pens and ink extracted from lines on white photocopier paper of 10 blue ballpoint pens were subjected to ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR), and high-performance thin-layer liquid chromatography (HPTLC). The R(f) values and color tones of the bands separated by thin-layer chromatography (TLC) analysis used to classify the writing inks into three groups. The principal component analysis (PCA) investigates the pen responsible for a piece of writing, and how time affects spectroscopy of written ink. PCA can differentiate between pen ink and ink line indicates the influence of solvent extraction process on the results. The PCA loadings are useful in individualization of a questioned ink from a database. The PCA of ink lines extracted at different times can be used to estimate the time at which a questioned document was written. The results proved that the UV-Vis spectra are effective tool to separate blue ballpoint pen ink in most cases rather than IR and HPTLC.     

涤纶纤维上分散染料的液-质分析

目的建立液-质联用技术对涤纶纤维上分散染料进行分析的方法。方法以N,N-二甲基甲酰胺为提取剂,在负离子模式下对12个黄色涤纶纤维上分散染料进行分析。结果12种分散染料在负离子模式质谱检测条件下均得到了有效的分析。根据一级负离子模式下总离子流图中准分子离子峰质荷比的不同,可将其中8种样品一一鉴别开。在此基础上,从染料离子化产物中选取响应信号较强的准分子离子为母离子,再对母离子进行二级质谱全扫描,依据二级质谱图中特征碎片峰的数目、质荷比的异同可对纤维上染料进一步进行鉴别。结论液-质联用法是检验有色纤维上染料的一种科学、有效的方法。     

The Role of Experts in the European Union's Research Policy

This research analyzes the role of experts in the European Union's policy‐making process. Focusing on the field of research policy, this study seeks to probe how expert participation in the Open Method of Coordination informs policy decisions. The paper reports on an analysis of the expert group in the European Internationalization Strategy in Science and Technology. Our analysis reveals the dynamics of expert participation at the micro level, as it identifies who these experts are, how they are appointed, and in what ways expert knowledge gets used in policy making.     

Development of a fast, simple profiling method for sample screening using high resolution melting (HRM) of STRs

A screening assay has been developed to provide preliminary individualization of crime scene samples thus eliminating expensive, time-consuming short tandem repeat (STR) profiling of nonprobative samples. High resolution melting performed in a real-time PCR instrument is used to detect the slight melting differences between the length and sequence variations of 22 forensic STRs. Three STRs (vWA, D18S51, THO1) were chosen to develop an assay which was optimized for Mg++ concentration, annealing/extension time/temperature, assay volume, and bovine serum albumin addition. The assay was tested for reproducibility, uniformity for genotype, melting profile consistency, effects of inhibitors, and mixture effects. The assay could be used to determine DNA concentration when a standard curve is run simultaneously. Calculations of costs show that the assay can save significant time and money for a crime with many samples or suspects.     

台湾政府在高新技术产业发展中的作用及其对广东的启示

台湾高新技术产业近 2 0年来发展迅速 ,其中一个重要原因就是政府十分重视对高新技术产业的扶持 ,并力求政府政策的制定符合高新技术产业发展的要求 ,从而有效地促进了本岛科技产业的发展。台湾政府在发展高新技术产业方面的成功经验 ,对广东高新技术产业的发展具有有益的启示。