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Firrao D Matteis P Scavino G Ubertalli G Ienco MG Pellati G Piccardo P Pinasco MR Stagno E Costanza G Montanari R Tata ME Brandimarte G Petralia S 《Journal of forensic sciences》2006,51(3):520-531
Evidence of exposure of a metal component to a small charge explosion can be detected by observing microstructural modifications; they may be present even if the piece does not show noticeable overall plastic deformations. Particularly, if an austenitic stainless steel (or another metal having a face-centered cubic structure and a low stacking fault energy) is exposed to an explosive shock wave, high-speed deformation induces primarily mechanical twinning, whereas, in nonexplosive events, a lower velocity plastic deformation first induces slip. The occurrence of mechanical twins can be detected even if the surface is damaged or oxidized in successive events. In the present research, optical metallography (OM) and scanning electron microscopy (SEM), and scanning tunneling microscopy (STM) were used to detect microstructural modifications caused on AISI 304Cu steel disks by small-charge explosions. Spherical charges of 54.5 or 109 g TNT equivalent mass were used at explosive-to-target distances from 6.5 to 81.5 cm, achieving peak pressures from 160 to 0.5 MPa. Explosions induced limited or no macro-deformation. Two alloy grain sizes were tested. Surface OM and SEM evidenced partial surface melting, zones with recrystallization phenomena, and intense mechanical twinning, which was also detected by STM and X-ray diffraction. In the samples' interior, only twins were seen, up to some distance from the explosion impinged surface and again, at the shortest charge-to-sample distances, in a thin layer around the reflecting surface. For forensic science locating purposes after explosions, the maximum charge-to-target distance at which the phenomena disappear was singled out for each charge or grain size and related to the critical resolved shear stress for twinning. 相似文献
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Presciuttini S Ciampini F Alù M Cerri N Dobosz M Domenici R Peloso G Pelotti S Piccinini A Ponzano E Ricci U Tagliabracci A Baley-Wilson JE De Stefano F Pascali V 《Forensic science international》2003,131(2-3):85-89
Eleven Italian forensic laboratories participated in a population study based on the AB Profiler Plus loci with proficiency testing. The validated database, including 1340 individuals, is available on-line. Tests for Hardy-Weinberg equilibrium, gametic unbalance, and heterogeneity of gene frequency were generally not significant. Gene frequencies at each locus were consistent with those of two previously published Italian studies, but different from a third. Individuals of each subsample were paired, and the total number of alleles shared across the nine loci was determined in each pair. The analysis was replicated over the total sample. In addition, two samples of mother-child pairs (N=315) and full-sib pairs (N=91) were subjected to allele sharing analysis. The resulting distributions were sufficiently distinct from the sample of unrelated pairs as to be of practical usefulness. 相似文献
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Three main factors explain public support for EU membership: utilitarian expectations, the role of values and ideas, and class partisanship. In the Polish case, public opinion polls and issues more specific to Poland, such as the role of the Catholic Church, populist political parties and profound Euroscepticism among farmers, suggest that although these theoretical explanations overlap, each of them has a different explanatory value. The economic approach remains the best predictor of support for EU membership, and whereas values and identity are closely linked to and dependent upon economic expectations, the impact of national politics appears largely decoupled from Polish Euroscepticism. 相似文献
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Gabriella Djerrahian 《African and Black Diaspora: An International Journal》2018,11(2):161-173
ABSTRACTThe ‘return’ of Ethiopian Jews to Israel in the last three decades provides an alternative case. In this presentation, I focus on the prominent role of music as ethno-racial information for Ethiopian Israelis as they engage with the process of homing and integrating in Israel. I explore their experience as black Jews through the musical tastes of young Ethiopian Israelis. For these youths, far from leaving their Ethiopianness behind, music is the fodder for actively reinventing it. I explore how they claim their place as Jews in Israel through participation in the musical communities of Ethiopian and African diasporas. 相似文献
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Malcolm R. Easton Gabriella R. Montinola 《Studies in Comparative International Development (SCID)》2017,52(3):349-371
Previous work suggests that remittances enable governments to reduce spending on public services and divert resources to serve their own interests. We argue this need not occur. Building on recent work which shows that the impact of remittances is contingent on the domestic environment in remittance-receiving countries, we hypothesize that (1) remittances are more likely to increase government spending on public services in democracies than in autocracies and (2) remittances are more likely to finance activities that deter political competition in autocracies than in democracies. Using a sample of 105 developing countries from 1985 through 2008, we find strong support for our hypotheses when examining the impact of remittances on public education, health, and military spending. We also provide suggestive evidence for the mechanism underpinning our results: micro-level evidence on remittance recipients’ preferences and political engagement. 相似文献
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Moira Zanaboni B.Sc. Gabriella Roda Ph.D. Sebastiano Arnoldi H.S.D. Eleonora Casagni M.D. Veniero Gambaro M.D. Michele Dei Cas M.D. 《Journal of forensic sciences》2020,65(2):636-640
The determination of carbon monoxide (CO) and carboxyhemoglobin (COHb) is of utmost importance in forensic toxicology to determine the cause of death in cases of CO poisoning, fire, and explosions. To this end, reliable and updated analytical methods are required. In this paper, four different methods for the determination of carbon monoxide in postmortem blood samples were compared: (i) the spectrophotometric determination of COHb applying the method proposed by Rodkey and modified by Beutler–West, (ii) the spectrophotometric determination of CO using a micro-diffusion-based method, (iii) the determination of CO by gas chromatography coupled to a TCD detector, and (iv) the determination of COHb by blood gas analysis. Three postmortem blood samples were analyzed with all methods, and the results were comparable. The applied methodologies showed different features depending on the sensitivity, sample preparation, and volume. The HS-GC/TCD method in our hand was the most appropriate, on postmortem samples, and versatile to apply. Unfortunately, only a limited number of postmortem blood samples were available for this study due to the rarity of that kind of intoxication in our jurisdiction. 相似文献
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Gabriella Meloni 《European Law Journal》2020,26(1-2):104-107
Is asking the Better Regulation Agenda (BRA) to answer the same preconditions it requires for any regulatory action a proper treatment? Does any assessment of the agenda necessarily imply a thorough definition of the costs and the benefits deriving from its application or is it enough to provide a few key insights to perform it? Is the BRA really so ideological, deriving from “a liberal analytical framework that considers no regulation/state intervention” as the preferred option? Is regulatory quality an issue that “cannot realistically be solved”? Does the principle of subsidiarity as a policy objective need some revision? Several questions come to mind when reading a very thought‐provoking article that is very critical of the BRA but that in the end recognises some of its main qualities. 相似文献