High-performance liquid chromatography-ultraviolet-visible spectroscopy-electrospray ionization mass spectrometry method for acrylic and polyester forensic fiber dye analysis

A critical point of comparison between a fiber collected from a crime scene and a fiber from a known source is the color. Fiber dye analysis using thin-layer chromatography or ultraviolet (UV)-visible (Vis) microspectrophotometry provides useful, although limited, data for comparison. High-performance liquid chromatography-electrospray ionization mass spectrometry (LC/MS) overcomes these limitations by integrating chromatography, ultraviolet-visible spectroscopy, and mass spectrometry into a single instrument. In order to evaluate the applicability of the LC/MS to forensic fiber dye analysis, a multi-stage chromatographic method using acidified water and acidified acetonitrile was developed that separated and identified a mixture of 15 basic and 13 disperse dye standards. The LC/MS also detected and analyzed dyes extracted from individual 0.5 cm acrylic and polyester fibers, demonstrating its applicability to this type of analysis. With regard to the analysis of disperse dyes in polyester fibers, the replacement of pyridine with acetonitrile in the extraction system allowed direct injection of the extracts into the LC/MS. The advantage of the LC/MS over other instrumental methods of textile dye analysis is demonstrated by the analysis and differentiation of three black acrylic fibers: two fibers had similar UV-Vis spectra but were differentiated with chromatography and two had similar UV-Vis spectra and chromatograms but were differentiated using the mass spectrometer.     

Differentiating writing inks using direct analysis in real time mass spectrometry

Writing ink analysis is used in establishing document authenticity and the sources and relative ages of written entries. Most analytical methods require removing samples or visibly altering the document. Nondestructive, in situ analysis of writing inks on paper without visible alteration is possible using mass spectrometry with a new ion source called Direct Analysis in Real Time. Forty-three different black and blue ballpoint, black fluid, and black gel inks were examined. Both dyes and persistent but thermally labile components of the inks contribute to the mass spectra, principally as protonated molecules [M+H](+). Numerous ink components were identified from the spectra. The spectra were placed in a searchable library, which was then challenged with two spectra from each of the 43 inks. The best match for each of the challenge spectra was correct for all but one ink, which matched with a very similar ink by the same manufacturer.     

A review of the analysis of vegetable oil residues from fire debris samples: analytical scheme, interpretation of the results, and future needs

This paper reviews the literature on the analysis of vegetable (and animal) oil residues from fire debris samples. The examination sequence starts with the solvent extraction of the residues from the substrate. The extract is then prepared for instrumental analysis by derivatizing fatty acids (FAs) into fatty acid methyl esters. The analysis is then carried out by gas chromatography or gas chromatography-mass spectrometry. The interpretation of the results is a difficult operation seriously limited by a lack of research on the subject. The present data analysis scheme utilizes FA ratios to determine the presence of vegetable oils and their propensity to self-heat and possibly, to spontaneously ignite. Preliminary work has demonstrated that it is possible to detect chemical compounds specific to an oil that underwent spontaneous ignition. Guidelines to conduct future research in the analysis of vegetable oil residues from fire debris samples are also presented.     

Development of a GC-MS method for the simultaneous analysis of latent fingerprint components

Latent fingerprint residue is a complex mixture of organic and inorganic compounds. A full understanding of the composition of this mixture and how it changes after deposition is lacking. Three solvent systems were compared for the simultaneous extraction and derivatization with ethyl chloroformate of selected amino and fatty acids from a nonporous substrate (Mylar for subsequent analysis by gas chromatography-mass spectrometry. A solvent system comprised of sodium hydroxide, ethanol, and pyridine was found to be the most effective. This method was applied to the analysis of latent fingerprint residue deposited on Mylar and preliminary data are presented. Twelve amino acids (e.g., serine, glycine, and aspartic acid) and 10 fatty acids (e.g., tetradecanoic, hexadecanoic, and octadecanoic acids) were identified. The potential application of this method to further the understanding of latent fingerprint chemistry has been demonstrated.     

Victim Policy Transfer: Learning From Each Other

This paper looks at the recent introduction of victim impact statements in several European countries. It asks whether victim impact statements are a positive addition to victim policy and practice in Europe and examines the challenges of adapting to the civil legal tradition a tool that was developed in a common law country.     

Financial Institutions between Effectiveness and Legitimacy – A Legal Analysis of the World Bank,Global Environment Facility and Prototype Carbon Fund

Environmental financing is one of the crucial issues of international environmental law and its implementation. From an environmental perspective a prerequisite for success is that financial resources are used in an environmentally effective way. Whether the World Bank, the Global Environment Facility (GEF) and the Prototype Carbon Fund (PCF) can be perceived as effective environmental actors has to be measured by their objectives, their potential to promote accepted environmental standards and their relevant funding practices. After significant improvements of their environmental policies, the World Bank must be considered the most important institution for environmental financing due to its involvement in environmental trust funds but also in regard to its regular lending practices. The GEF remains exceptional due to its institutional structure and scope, whereas the PCF is an example of public–private partnerships that might be a model for future financing via trust funds. Since acceptance of institutions can only be created if they are considered to be legitimate, legitimacy is closely tied to effectiveness. The main criteria for legitimacy are state consent and the equality of states as well as supplementary considerations such as transparency and public participation. From this perspective the World Bank, GEF and PCF structures of voting and participation have come a long way, and despite their particularities and deficiencies they reflect to a varying degree elements of legitimate decision making.     

Political Disagreement in Context: The Conditional Effect of Neighborhood Context, Disagreement and Political Talk on Electoral Participation

Despite scholarly interest in determining how exposure to disagreeable political ideas influences political participation, existing research supports few firm conclusions. This paper argues that these varied findings stem from an implicit model of contextual influence that fails to account for the indirect effect of aggregate social contexts. A model of contextual influence is outlined which implies that the neighborhood partisan context moderates the effect of political disagreement in social networks on campaign participation. The evidence shows that network disagreement demobilizes people who are the political minority in their neighborhood, but has no influence on people in the majority. When viewed together, these findings indicate that a person’s relationship to the broader political environment sets distinctive network processes in motion.

The Rise and Fall of Political Engagement among Latinos: The Role of Identity and Perceptions of Discrimination

This study analyzes how perceptions of discrimination against oneself and/or one’s group and whether one self-identifies in national (American), national origin, or panethnic terms affect levels of political engagement among Latinos in the United States. The findings show that perceptions of discrimination against oneself are particularly damaging in that they promote both behavioral and attitudinal alienation (e.g., non-voting and lack of trust), especially among Latinos who identify primarily as American. Behavioral alienation can be mitigated, and even overcome, when perceptions of discrimination are accompanied by a panethnic or national origin self-identification. However, the attitudinal alienation created by perceptions of discrimination is not mitigated by any type of self-identification. These findings shed light on understudied factors that affect political engagement that are going to become more important to understand as the American population continues its ethnic diversification. In addition to expanding our knowledge of political engagement generally, this study also raises important questions about whether the adoption of an American self-identification is in fact beneficial for the health of our participatory political system as a whole.     

“群众性政党”的提出与中共四大的作用

"群众性政党"的目标,出于共产国际四大。由于当时中国共产党尚处于幼年 时期,党的力量和影响都不大,因而遭到共产国际代表马林的轻视,反对将中国共产党建 设成群众性的政党,并把中国革命的希望寄托于国民党身上。中共四大根据建设群众性政 党的目标,加强了党的建设,使党开始走上群众性政党的道路。"五卅"运动的成功,标志着 中国共产党发展成为群众性的政党。     

The Impact of Municipality Mergers on Political Participation

The citizen assembly of the Swiss canton Glarus in 2006 decided to radically reduce the historical number of communes from 25 to three. Studies show that the financial and economic consequences are surprisingly small. This paper analyzes the effects on citizens' vote participation as an indicator of their political involvement. Using the difference-in-difference and the synthetic control methods, we empirically show that vote participation dropped significantly, also compared to neighboring cantons and the rest of Switzerland.