XMCD studies and magnetic properties of ZnTe doped with Ti, Cr, Mn and Co

Using the full potential linear augmented plane wave (FP-LAPW) method as implemented in the WIEN2K code in connection with the Generalized Gradient Approximation (GGA). We study the magnetic properties of ZnTe doped with some transition metals elements. In addition, to the X-ray absorption spectra (XAS) and X-ray Magnetic circular dichroism (XMCD) calculations to compute the orbital and spin moments separately. Two principal examples will be given: The induced magnetic moments ZnTe of the light and heavy 3d elements (Ti, Cr and Mn, Co) can be determined by the XMCD sum rules analysis at the L2,3 edges. Moreover, it has been found that for the lighter 3d elements the spin-orbit splitting of the transitions 2P1/2 and 2P3/2 states reduces toward, which has a consequence that two excitations are coupled

Evaluation de l’antibioprophylaxie en chirurgie urologique au sein de l’Hôpital Militaire Moulay Ismail de Meknès L’antibioprophylaxie en urologie

No Abstrac

A Miniature RFID Antenna at UHF Band using Meander-Line Technique

This paper displays a new design of a small antenna proposed for radio-frequency identification (RFID) applications in the UHF band (ultra-high frequency). Our antenna is constituted of two rectangular patches linked together with a meander line. Using this technique reduction in antenna size of equal to 62% with respect to the conventional antenna was achieved. The antenna has a simple structure and small antenna size of 60 x 74mm2 or 0.184 λ0 x 0.226 λ0. It has been fabricated on a low-cost FR4 substrate and measured to validate the simulation performances.The measured bandwidth is around 54.4 MHz (889.3 - 943.7 MHz) with reflection coefficient less than 10 dB, which covers all of the American RFID band (902 - 928 MHz), Chinese RFID band (920.5 - 924.5 MHz), Korea Republic and Japan RFID band ( 917 - 923.5 MHz).The design and simulations have been effected by electromagnetic simulators HFSS and CST microwave studio. A good accord is getting between the simulated and measured results. This antenna is intended for the reader of RFID applications

Pb et As dans des eaux alcalines minières : contamination, comportement et risques (mine abandonnée de Zeïda, Maroc)

Des échantillons d’eau et de matière en suspension ont été prélevés le long de l’oued Moulouya et dans des lacs de carrière au niveau de l’ancien centre minier de Zeïda (Haute Moulouya, Maroc) en vue d’en évaluer la salubrité. Il est en effet important d’établir le degré et les causes éventuelles de dégradation de la qualité de ces eaux, compte tenu de leur usage à des fins tant domestiques qu’agricoles. Des résidus de traitement ont également été échantillonnés dans les haldes abandonnées.L’analyse des distributions et des variations spatio-temporelles des concentrations de Pb et As a permis de mettre en évidence que le centre minier a véritablement un impact sur la qualité des eaux de surface environnantes, malgré le caractère neutre à alcalin du drainage. Aucune ne rejoint les critères de l’Organisation mondiale de la santé en matière de Pb et As dans l’eau potable (10 µg/L), mais près de la moitié souscrit aux normes marocaines (50 µg/L). L’importance de la dégradation varie selon la saison et la localité, et le contraste entre sites a priori non dégradés et sites dégradés n’est pas toujours très prononcé. On observe même des variations à l’inverse des tendances attendues. Les résultats peuvent cependant être réconciliés en tenant compte de l’importance du transport particulaire par rapport au transport dissous au moment et au lieu de l’échantillonnage.Il appert que les minéralisations et les résidus miniers restés sur place peuvent constituer la principale source de pollution des eaux de surface de la région de Zeïda.The Upper Moulouya Basin was the location of extensive lead mining between 1930 and 1985, with three major operations near Aouli, Mibladen and Zeïda. The Moulouya drains about 7.5% of the Moroccan territory and provides drinking and irrigation water to many communities over its more than 500 km path. It is thus important to determine the impact of past mining activities on its water quality, since the mining sites were abandoned with little or no rehabilitation. This paper focuses on the Zeïda area, the uppermost of these mining centres on the Moulouya.About 630,172 t of lead concentrates (40‑70% Pb) were produced between 1972 and 1985 at Zeïda. Lead was mined from carbonate and sulphide mineral deposits (cerussite, 70%; galena, 30%) mixed with barite in stratiform ore bodies hosted by Permo-Triassic arkoses. Mining left 12 Mt and 70 Mt of tailings and wastes in fully exposed piles on each side of the Moulouya, as well as a dozen water-filled open-stopes. Mine drainage is of neutral pH, thanks to the low content of residual sulphide minerals and the availability of carbonate in the tailings and host rock. The river and some quarry-lakes are tapped to fulfill domestic, agricultural and stock-breeding needs. One lake is used to directly feed Zeïda’s water network (pop. 3,000), without any water treatment.The Moulouya, upstream and downstream of Zeïda, and four lakes were sampled twice in 2002 (dry period: February; wet period: April). Temperature, electric conductivity (EC), Eh and pH were measured in the field. Samples were filtered through 0.45 µm membranes. The filtrates were preserved with 4% HNO3 and kept at 4°C until analysis. The filters and their particulate fraction, as well as a composite sample of the tailings, were dried and kept dry until dissolution and analysis. All measurements were performed by ICP-MS and capillary electrophoresis analyses.Lead and arsenic are well above « normal » concentrations in the tailings, at 5,547 g/t and 192 g/t, respectively. These elements are clear threats to population health, since dust from unstabilized tailings can be dispersed by wind and rain waters, contaminating agricultural soils and surface waters, and eventually leading to cases of saturnism or arsenical intoxication in the population. All Pb and As concentrations measured in the waters sampled are above the World Health Organisation criteria for drinking water (10 µg/L for Pb and As). Nevertheless, about half of these measurements meet the Moroccan criteria (50 µg/L). All samples show near neutral or slightly basic pH values (7.2-8.9). EC is also high (> 1,000 µS/cm).As and Pb are largely associated with the particulate fraction (> 80% of total As and Pb), except for As in two lakes (< 40%). Overall, their concentrations are higher in the Zeïda area than upstream in the Moulouya. However, this is a tendency rather than a rule, because the differences are often small (< 50%) and suffer exceptions. For instance, Pb concentrations are 60% lower than the so-called uncontaminated reference station, in two quarry-lakes sampled during the wet period. The occasional lack of significant and consistent contrast between an obviously degraded environment and a pristine site was unexpected. The results were therefore further investigated, in order to identify possible explanations for the apparent discrepancies.Coherency in the data set emerges when one considers the relative importance of dissolved and particulate transport in the various types of environments sampled. Using this interpretation scheme, EC is considered as an indicator of solute transportation, since EC is a function of dissolved ionic components. Total Pb is regarded as an indicator of particulate transportation, since Pb is strongly adsorbed to particulate substrates at the pH observed. Following these assumptions, particulate transport appears to dominate over dissolved transportation in the Moulouya. Total Pb increases by factors of 3.4 and 9.8 from dry to wet periods, whereas EC decreases by 0.7-0.8, as a result of rain dilution. In two of the four lakes, dissolved transport is comparatively more important, since EC does not change significantly and total Pb shows only a small increase from the dry to the wet period. In these lakes, the dissolved input during the rainy period appears to be large enough to keep EC at its previous value, without significant dilution, as opposed to what is going on in the Moulouya. In the two other lakes, both EC and total Pb decrease from the dry to the wet period, pointing to dilution effects greater than either dissolved or particulate mobilization.Apparent discrepancies in the intensity and direction of variations are explained when prevailing modes of dispersion are taken into account. For instance, the enrichment factor of total Pb in the Moulouya, downstream of Zeïda, jumps from 1.1 (dry) to 3.2 (wet), with respect to the reference station. Meanwhile, EC increases only from 1.2 (dry) to 1.5 (wet). The greater increase of total Pb over EC is explained by prevalent particulate transport. In another case, the enrichment of EC with respect to the reference station, in two lakes, increases from 14.2 and 20.4 (dry) to 20.1 and 27.9 (wet) while total Pb enrichment decreases from 2.0 and 2.0 (dry) to 1.6 and 1.3 (wet). Here, the prevalence of dissolved transport in these two lakes, combined with particulate transport at the reference station, allow for a strong increase in the EC parameter, concurrent with a weak increase in total Pb. Finally, in the lakes where both dissolved and particulate transport are presumably minor, total Pb undergoes enrichment with respect to the reference station, in the dry period (by 3.4 and 1.8), whereas depletion characterizes the wet period (0.6 in both lakes). In this case, enrichment is likely the result of evaporation during the dry season, and depletion the result of dilution by rain during the wet period. These two types of lake behave differently because they are located next to residual mineral deposits (likely with more soluble phases), have short travel distances and thus fewer contacts with adsorbing substrates, which is not the case for the other two lakes

Leiomyosarcome Du Cordon Spermatique

Introduction: Leiomyosarcoma of the spermatic cord is a rare tumor, develops from the mesenchymal tissues of the spermatic cord, epididymis and&nbsp; testicular tunics. Its incidence is 0.05 to 0.1% and the occurrence in the testis is rare. In the literature, the testicular leiomyosarcoma (LST) is reported as sporadic cases or as a very limited series. In adults, most testicular sarcomas are the result of a sarcomatous transformation of germ cell tumors (GCT) especially teratomas and spermatocytic sarcomas.Observation: We report on a pure paratesticular leiomyosarcoma and we present the histological, therapeutic and prognostic aspects of this rare tumor

Localisation Intravésicale d’une Broche d’ostéosynthèse (A Propos D’un Cas)

La variété de corps étrangers introduits dans l’appareil génito- urinaire défie l’imagination et peut confronter l’urologue aux difficultés de leur extraction. Si leur présence relève souvent d’une pratique douteuse d’origine psychiatrique, il faut noter la possibilité d’une migration à partir des espaces perivésicaux lors d’une chirurgie de voisinage ainsi qu’une introduction accidentelle durantune intervention transvésicale. Les symptômes du bas appareil urinaire, non spécifiques, sont les circonstances fortuites de découverte de corps étrangers intravésicaux. Bien que le pronostic vital ne soit pas engagé, l’extractionchirurgicale ou endoscopique s’avère nécessaire du fait de l’inflammation sévère associée aux dommages vésicaux secondaires à ce corps étranger.Nous rapportons le cas d’un jeune patient admis aux urgences chez qui on trouve une broche d’ostéosynthèse compliquée d’une lithiase située dans la vessie

Le cancer du rein chez l’adulte. Etude rétrospective à propos de 155 cas

Objectif: Analyser les différents aspects épidémiologiques, cliniques, radiologiques, pathologiques et thérapeutiques du cancer du rein dans notre contexte. Patients et méthodes: Il s’agit d’une étude rétrospective à partir des dossiers des patients hospitalisés à notre service d’urologie pour tumeurs du rein entre 1990 et 2007. Sur les 155 dossiers consultés, 125 patients ont été traités chirurgicalement, et pour 30 patients, l’abstention a été justifiée par le stade évolué localement ou métastatique et/ou le mauvais état général. Les paramètres étudiés ont été : l’âge, la symptomatologie clinique, le bilan radiologique, le type d’intervention, les résultats anatomopathologiques et le stade histologique TNM. Tous les patients ont été revus avec un examen clinique, une échographie ou tomodensitométrie abdominale avec radiographie thoracique et une créatinémie. Résultats: Il s’agissait de 105 hommes et 50 femmes. L’âge moyen de découverte était de 60 ans (extrêmes : 18 et 85 ans). Le délai moyen entre l’apparition des symptômes et le diagnostic était d’environ 9 mois (extrêmes : 1 et 24 mois). L’hématurie était le signe révélateur le plus important noté chez 45,2% des cas. Le diagnostic a été basé sur le couple échographie – tomodensitométrie chez tous nos patients. La taille tumorale moyenne était de 10 cm (extrêmes 3 et 20 cm) lors du bilan initial. Le rein gauche était touché plus souvent que le rein droit (67% vs. 33%). Le bilan d’extension à distance était négatif chez 95 patients (61,3%), alors que 60 patients avaient des métastases viscérales et/ou ganglionnaires. Parmi ces derniers, 30 avaient un mauvais état général et/ou des métastases viscérales multiples ce qui a contre indiqué le geste opératoire. Les localisations métastatiques des 30 patients opérés étaient les suivantes: poumons (5 cas), ganglions (15 cas), os (2 cas), foie (8 cas). Plus de 80% des tumeurs étaient des carcinomes à cellules claires (carcinomes conventionnels). L’intervention a consisté à une néphrectomie totale élargie à ciel ouvert chez tous nos patients opérés. La médiane de suivi était de 62 mois (extrêmes: 6-72 mois). Trente patients ont été perdus de vue définitivement après l’intervention. Sur l’ensemble de la série, les taux respectifs de survie sans récidive à 3 ans et à 5 ans étaient de 78,4% et 47,2%. Conclusion: Le cancer du rein est une pathologie qui n’est pas rare. Sa symptomatologie est polymorphe. Le traitement de référence est la néphrectomie totale élargie. Les facteurs pronostiques les plus déterminants sont le stade (TNM) et le grade histologique de Fuhrman. Selon notre série, la néphrectomie élargie permet un taux de survie sans récidive supérieur à 85%, tous stades et types histologiques confondus.Mots clés: Cancer, rein, adulte

Optimal Control of Nonlocal Thermistor Equations

We are concerned with the optimal control problem of the well known nonlocal thermistor problem, i.e., in studying the heat transfer in the resistor device whose electrical conductivity is strongly dependent on the temperature. Existence of an optimal control is proved. The optimality system consisting of the state system coupled with adjoint equations is derived, together with a characterization of the optimal control. Uniqueness of solution to the optimality system, and therefore the uniqueness of the optimal control, is established. The last part is devoted to numerical simulations.Comment: Submitted 21-March-2012; revised 11-June-2012; accepted 13-June-2012; for publication in the International Journal of Contro