纳米粉末显现水果和蔬菜表面手印

目的研究纳米粉末显现水果和蔬菜表面的手印。方法纳米Fe3O4粉末的显现方法同常规磁性粉末;纳米ZnO粉末则是撒粉于可疑表面,然后用吸耳球轻轻吹掉多余的粉末直到手印显出,利用多波段光源,在紫外一可见光范围内拍照;并与松花粉显现法比较。结果纳米Fe3O4粉末可以清晰显现4种检材表面的手印;纳米ZnO粉末可显现除土豆之外的3种检材表面的手印,尤其显现西红柿表面手印的效果最好;与松花粉相比,纳米粉末显现的手印纹线流畅、细腻,细节特征清晰。结论利用纳米粉末可以有效显现水果蔬菜表面的手印,显出的纹线在紫外－可见光范围内拍照均可以得到反差较大的影像。     

Simulating transfer and persistence of a chemical marker powder for Lycopodium clavatum spores

In this research a chemical marker powder, based on Lycopodium clavatum spores, was studied to determine its transfer and persistence on a T-shirt. Such chemical marker powders are used to provide evidence that a person has handled a covertly marked object, such as a drug package. The powder was found to transfer readily between a marked item and the person handling it. The powder was found to persist on a T-shirt for up to 13 h; however, there was only a very small amount of powder remaining at this time. The rate of loss of the L. clavatum spores was found to follow a decay curve. The largest decrease in spores from the T-shirt was seen in the first 2 h after the marked item had been handled.     

In the Line of Fire—21st-Century Approach to an Ancient War Injury

Abstract:  Authentic black-powder muzzle-loader weapons or replicas are used today primarily for re-enactments of historic battles. A lay actor playing the role of a Prussian infantryman sustained life-threatening gunshot injuries during a recent re-enactment of a historic battle of the Sixth Coalition. As only blank historic muzzle-loading weaponry was used, the origin of the missile causing the wounding was initially unclear. Further investigation revealed a ramrod that had been propelled out of the barrel of another gunner's smooth-bore gun as cause of injury. The ramrod was hurled on a trajectory of more than 20 m, breaking the victim's shouldered barrel and hitting the victim resulting in severe abdominal, thoracic, and upper limb injuries. The critical incidents while handling muzzle-loading weaponry leading to premature discharge are elucidated. Furthermore, this report demonstrates how actual diagnostics and subsequent surgical treatment enabled this infantryman to survive an injury to which his comrades-in-arms would have succumbed 200 years ago.     

灰尘鞋印直显与荧光显现研究

本文根据邻菲(口罗)啉在弱酸条件下与Fe~(2 )反应生成稳定的桔红色给合物的原理,对遗留在各种纸张、本色木、地板砖.地板革等承受客体上的灰尘鞋印进行显现,获得较佳效果.对微弱或潜在灰尘鞋印,用上述方法处理后,再用荧光粉末刷涂,用多波段光源显现效果更佳.     

论我国黑恶犯罪形势及"打黑除恶"工作

黑恶犯罪给我国政治、经济、社会秩序带来严重危害,已成为构建社会主义和谐社会的重大隐患.加强"打黑除恶"工作,应该明确"打黑除恶"工作的指导思想和战略方针,全面推行和落实"打黑除恶"责任制,建立公安机关"打黑除恶"协调机制,建立打击有组织犯罪的专门机构和队伍,充分运用侦查谋略和手段,坚决冲破"关系网",打掉"保护伞",加强打击有组织犯罪的立法工作,广泛宣传发动群众,畅通群众举报渠道.     

Black music and pan-African solidarity in Keorapetse Kgositsile’s poetry

The African American revolutionary poetry outfit and purported grandfathers of rap The Last Poets coined their name from Keorapetse Kgositsile's poem “Towards a Walk in the Sun”. This is relatively common knowledge. However, no sustained academic research has been conducted on this crucial exchange in diasporic studies. In this paper, I show how Kgositsile's poem in question harvested the rich oral, aural, and literary practices of his native Setswana, which in turn enabled The Last Poets to not only draw a name from Kgositsile's poetry, but also a language and poetic. This way, I demonstrate multivalent streams of influences between black South Africa and black America, as opposed to the current one-way exchange in scholarship that almost always presents black South Africans as emulators and mimickers of Afro-American culture. I expose how Kgositsile's poetry trans/figures both Afro-American literary and musical histories. Functioning within the framework of pan-Africanism, I uncover black music's transatlantic arch in Kgositsile's poetry, which unifies Africa, the Caribbean, and black America. I offer a deep analysis of that arch, and demonstrate its dynamic and complex networks which span generations and centuries, and continues to be generative till today. I focus particularly on the evolution of orality and aurality in black expressive cultures, understood as practices that express the black cultural continuum on both sides of the Atlantic.     

Reviving rosetta tharpe: performance and memory in the 21st century

This article examines the pleasures and dangers of the 'reviving'—that is, restoring to memory, of a 'forgotten' female gospel-guitarist, Sister Rosetta Tharpe. It argues that the erasure of black women from cultural memory is not merely the effect of the passage of time, but of small but significant acts of forgetting that themselves constitute cultural practices. As examples of attempts to forestall forgetting and 'revive' the dead, the essay looks to a recent Rosetta Tharpe tribute CD, composed of women musicians' versions of songs Tharpe made famous, as well as a local Pittsburgh theatre incorporation of Tharpe as a character in its production 4 Real Women. Both projects, although inevitably fraught by difficulties specific to their medium of performance and address, set the terms of cultural 'revival' crucial not merely to Rosetta Tharpe but to black women performers generally.     

上海地区有组织犯罪问题研究

自90年代起,我国大陆的有组织犯罪又开始死灰复燃,且大有愈演愈烈之势.本文首先讨论了有组织犯罪不同阶段上的特点,着重分析了上海地区有组织犯罪的现状及其产生的原因,在此基础上,对有组织犯罪在上海的发展趋势进行了预测,认为我们必须对反黑斗争的长期性、艰巨性有充分的认识,不断研究斗争动向,调整斗争策略,通过实践,逐步摸索出一套在我国经济较发达地区打击有组织犯罪的有效措施和方法.     

‘The objectionable injectable’: recovering the lost history of the WLM through the Campaign Against Depo-Provera

ABSTRACT

The Women’s Liberation Movement (WLM) was one of the most important social movements of the twentieth century. Although the last few years have seen an increase in historical work exploring the movement, archival-based accounts of the diverse groups that comprised the WLM are few and far between. This article will uncover, and shed light on, the important work of the Campaign Against Depo-Provera. It will explore how women’s campaigns operated during this period, whilst also providing a lens for examining how women engaged with race and class. It will argue that we need to adopt a more nuanced understanding of how feminists engaged with identity, as an examination of the Campaign Against Depo-Provera questions many of the previously held orthodoxies in the literature.     

The Effects of Polymer Pigmentation on Fingermark Development Techniques

The effectiveness of latent fingerprint development techniques is heavily influenced by the physical and chemical properties of the deposition surface. The use of powder suspensions is increasing for development of prints on a range of surfaces. We demonstrate that carbon powder suspension development on polymers is detrimentally affected by the presence of common white pigment, titanium dioxide. Scanning electron microscopy demonstrates that patches of the compound are clearly associated with increased levels of powder adhesion. Substrates with nonlocalized titanium dioxide content also exhibit increased levels of carbon powder staining on a surface‐wide basis. Secondary ion mass spectrometry and complementary techniques demonstrate the importance of levels of the pigment within the top 30 nm. The association is independent of fingermark deposition and may be related to surface energy variation. The detrimental effect of the pigment is not observed with small‐particle reagent (MoS₂ SPR) or cyanoacrylate (superglue) fuming techniques that exploit different development mechanisms.