Inhalant abuse detection and evaluation in young Tunisians

Occupational exposure biological monitoring techniques were applied for the diagnosis of inhalation abuse and for the evaluation of the levels of exposure to benzene, toluene, ethylbenzene, xylenes, and n-hexane, in 44 Tunisian adolescents and children suspected for volatile substance addiction. Urinary trans,trans-muconic acid, hippuric acid (HA), mandelic acid, and methylhippuric acids determinations were performed by high performance liquid chromatography with a photodiode array detector, and urinary o-cresol (o-Cr) and 2,5-hexanedione (HD) were extracted simultaneously and measured using gas chromatography with a flame ionization detector. Given the high linearity ranges, HD and o-Cr occupational exposure monitoring techniques could be applied without modification. However, urinary sample dilution was necessary before HA analysis. Concentrations were compared with the maxima of normal values (MNVs) in the general population and to the biological exposure indices (BEIs) used in occupational toxicology. Values as high as 6610-fold the MNV and 68 times the BEI were registered. The subjects showed high exposure to toluene and hexane. Measured metabolites HA and/or o-Cr and HD enabled the easy detection and evaluation of exposure levels. The problem of inhalant abuse should be given more attention and treated through an effective prevention strategy.     

Recovering obliterated engraved marks on aluminium surfaces by etching technique

A study has been made of the characteristics of restoration of obliterated engraved marks on aluminium surfaces by etching technique. By etching different reagents on 0.61mm thick sheets of aluminium (99wt%) on which some engraved marks had been erased to different depths it was found that the reagent 60% hydrochloric acid and 40% sodium hydroxide on alternate swabbing on the surfaces was found to be the most sensitive one for these metal surfaces. This reagent was able to restore marks in the above plates erased down to 0.04mm below the bottom of the engraving. The marks also presented excellent contrast with the background. This reagent was further experimented with similar aluminium surfaces, but of relatively greater thickness of 1.5mm. It was noticed that the recovery depth increased slightly to 0.06mm; this suggested the dependence of recovery depth on the thickness of the sheet metal. Further, the depth of restoration decreased in cases where the original number was erased and over which a new number was engraved; the latter results are similar to those of steel surfaces reported earlier [M.A.M. Zaili, R. Kuppuswamy, H. Harun, Restoration of engraved marks on steel surfaces by etching technique, Forensic Sci. Int. 171 (2007) 27-32].     

Are profits from subdivision development higher in areas with more regulations? A case study of South Kingstown,Rhode Island and some implications for land use planning

Little is known about the relationship between land use regulations and profits from subdivision development. Using data from a heavily regulated market, this article presents analyses that for the first time determine actual profits from subdivision development.

This study found an average profit, measured by internal rates of return, of 29%, which is statistically greater than what scholars consider normal. Profits decreased as time to complete the subdivision increased. Profits also decreased because of delays due to regulations and voluntary decisions by developers. The findings suggest that higher profits could be attainable in more-regulated areas because regulations may create amenities whose value exceeds the costs of providing them, while the same regulations may make it difficult for outside developers to enter the market thus limiting competition among developers. The findings suggest that policy makers should be cautious about regulations that create amenities when these regulations may inhibit competition among developers.     

From Al-Itihaad to Al-Shabaab: how the Ethiopian intervention and the ‘War on Terror’ exacerbated the conflict in Somalia

Abstract

External intervention has frustrated and continues to frustrate peace and stability in the Horn of Africa and Somalia, adding various adverse layers to an already complicated and complex conflict. The level of forceful military engagement intended for regional domination has profoundly affected negatively the efforts of peacebuilding and statebuilding in Somalia. This article examines how the earlier Ethiopian policies towards Somalia has reshaped the (post)-Cold War politics of the Horn. In doing so, it traces the roots of the Ethiopian intervention in Somalia vis-à-vis new non-state armed groups to chart the changing political dynamics of the conflict in Somalia. By using historical approach, the article argues that Ethiopia’s agenda is central to understanding why the ‘War on Terror’ has strengthened and subsequently midwifed armed militant movements (e.g. new insurgency groups) in Somalia, starting from Al-Itihaad to today’s Al-Shabaab. In focusing upon various regional actors and groups, the article moves from the emphasis of internal systems to external power structures, considering the wider historical and political factors in the region that must be closely examined if the regional and local conflicts are to be deeply understood. While it is a context-specific study, the article aims to contribute fresh perspectives and insights to ongoing discussions on the consequences of the Ethiopian intervention in Somalia.     

Non-destructive testing techniques for the forensic engineering investigation of reinforced concrete buildings

This study describes in detail the results of a laboratory investigation where the compressive strength of 150mm side-length cubes was evaluated. Non-destructive testing (NDT) was carried out using ultrasonic pulse velocity (UPV) and impact rebound hammer (IRH) techniques to establish a correlation with the compressive strengths of compression tests. To adapt the Schmidt hammer apparatus and the ultrasonic pulse velocity tester to the type of concrete used in Algeria, concrete mix proportions that are recommended by the Algerian code were chosen. The resulting correlation curve for each test is obtained by changing the level of compaction, water/cement ratio and concrete age of specimens. Unlike other works, the research highlights the significant effect of formwork material on surface hardness of concrete where two different mould materials for specimens were used (plastic and wood). A combined method for the above two tests, reveals an improvement in the strength estimation of concrete. The latter shows more improvement by including the concrete density. The resulting calibration curves for strength estimation were compared with others from previous published literature.     

Variation of δ2H, δ18O & δ13C in crude palm oil from different regions in Malaysia: Potential of stable isotope signatures as a key traceability parameter

A total of 33 crude palm oil samples were randomly collected from different regions in Malaysia. Stable carbon isotopic composition (δ¹³C) was determined using Flash 2000 elemental analyzer while hydrogen and oxygen isotopic compositions (δ²H and δ¹⁸O) were analyzed by Thermo Finnigan TC/EA, wherein both instruments were coupled to an isotope ratio mass spectrometer. The bulk δ²H, δ¹⁸O and δ¹³C of the samples were analyzed by Hierarchical Cluster Analysis (HCA), Principal Component Analysis (PCA) and Orthogonal Partial Least Square-Discriminant Analysis (OPLS-DA). Unsupervised HCA and PCA methods have demonstrated that crude palm oil samples were grouped into clusters according to respective state. A predictive model was constructed by supervised OPLS-DA with good predictive power of 52.60%. Robustness of the predictive model was validated with overall accuracy of 71.43%. Blind test samples were correctly assigned to their respective cluster except for samples from southern region. δ¹⁸O was proposed as the promising discriminatory marker for discerning crude palm oil samples obtained from different regions. Stable isotopes profile was proven to be useful for origin traceability of crude palm oil samples at a narrower geographical area, i.e. based on regions in Malaysia. Predictive power and accuracy of the predictive model was expected to improve with the increase in sample size. Conclusively, the results in this study has fulfilled the main objective of this work where the simple approach of combining stable isotope analysis with chemometrics can be used to discriminate crude palm oil samples obtained from different regions in Malaysia. Overall, this study shows the feasibility of this approach to be used as a traceability assessment of crude palm oils.     

Les facteurs qui ont affecté la mise en oeuvre du plan de Gestion Lambert

Sommaire: Dans cet article, I'auteur a examiné sur une pé riode de cinq ans, de 1979 à 1984, les facteurs qui semblent avoir affecté la mise en oeuvre du plan de gestion de la Commission royale sur la gestion financière et I'imputabilité. Il conclut que la mise en oeuvre du plan en question a é té affecté e par des variables organisation- nelles et politiques. Pour ce qui est des variables organisationnelles, nous retrouvons I'incompatibilité du plan de gestion de la Commission avec la straté gic anté rieure de gestion du Cabinet, les rapports de force entre les organismes centraux et les ministères et organismes, la fragmentation du processus dé cisionnel et les changements apportés à la gestion gouvernementale entre 1976 et 1979. Les pré fé rences des principaux acteurs, la responsabilité collective du Cabinet, la responsabilité ministé rielle, le rôe et les traditions parlementaires constituent les obstacles politiques les plus importants. Abstract: In this article, the author examines over a five-year period, from 1979 to 1984, the factors that appear to have affected the implementation of the management plan of the Royal Commission on Financial Management and Accountability. His conclusion is that the implementation of that plan was affected by organizational and political variables. Among the organizational variables, there is the incompatibility between the commission's management plan and the previous management strategy of the cabinet, the relative strength of the central agencies and the departments and organizations, the fragmentation of the decision-making process, and the changes in government management between 1976 and 1979. The preferences of the main parties involved, the collective responsibility of the cabinet, ministerial responsibility, as well as parliamentary roles and traditions, are the major political impediments.