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Time-of-flight secondary ion mass spectrometry (ToF-SIMS) chemical mapping was used to investigate the order of deposition of natural latent fingerprints and laser printed ink on paper. This feasibility study shows that sodium, potassium and C3H5 positive ions were particularly abundant endogenous components of the natural fingerprints and also present in the paper examined, but were mostly absent in the laser printed ink. Mapping of these ions enables the observation of friction ridges from latent prints on the ink surface, only when a fingerprint was deposited above the layer of ink. As a demonstration of proof of concept, blind testing of 21 samples from three donors resulted in a 100% success rate. The sensitivity of this technique was investigated within this trial through the examination of up to fifth depletion fingerprints and ageing of up to 28 days. Migration of fingerprint and paper components to the ink surface, although observed with increased ageing time, was not found to compromise determination of the deposition sequence. 相似文献
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Political Behavior - Research on the link between health and political behavior has flourished, yet there have been no analyses regarding the political consequences of health inequalities. Using... 相似文献
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Simon R. Bacon M.Phil. Jesus J. Ojeda Ph.D. Rory Downham B.Sc. Vaughn G. Sears B.Sc. Benjamin J. Jones Ph.D. C.Phys. 《Journal of forensic sciences》2013,58(6):1486-1494
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. 相似文献
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Diana Ojeda 《The Journal of peasant studies》2013,40(2):357-375
While conflict-related dynamics are recognized as causes of land grabbing in Colombia, violent processes of exclusion and expropriation behind ‘greener’ projects are often seen as disconnected from them. The case of ecotourism in Tayrona National Natural Park makes it possible to explore the geographies of violence that sustain tourism in the area and their role in shaping everyday resource politics. This paper shows how green pretexts of paradisiacal spots in need of protection have contributed to privatization and dispossession. Furthermore, it details how land-grabbing dynamics have been enabled by processes of sociospatial demarcation that produce not-green-enough subjects as bodies-out-of-place. 相似文献
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Ojeda De La Pena N 《Estudios demográficos y urbanos》1986,1(2):227-65, 325-6
Data from the 1976 Mexican Fertility Survey are analyzed to determine the extent of legitimization of children born out of wedlock. The socioeconomic characteristics of women in consensual and legal unions are compared. The frequency and timing of legalization of consensual unions is analyzed, and the number of consensual unions and the frequency of legalization in rural and urban areas are compared. The role of pregnancy in forcing legalization and the stability of legal unions with and without prior cohabitation are studied. (SUMMARY IN ENG) 相似文献
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Raquel Ojeda García 《British Journal of Middle Eastern Studies》2015,42(1):46-58
This article examines the project of advanced regionalisation in Morocco, in which the King Mohammed VI plays a key role. Through a comparative analysis of the adjustments and resiliencies of the project, contrasted with previous regionalisation reforms, the article contends that contention dynamics in Morocco, Tunisia and Egypt have had a relevant impact on the way in which the project made its way in the Moroccan institutional sphere. The article finds that the eruption of the Arab Uprisings in North Africa and protests in Morocco has been a key factor in paradoxically fostering the king's power, allowing him to consolidate himself as the unique driving force behind the reform of regional administration. 相似文献
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