The present study deals with the biostratigraphic and geochemical analysis of the Cenomanian-Turonian deposits of the Thénièt El Manchar district in the Bellezma-Batna Range, and their vertical fluctuations. A 180 m-thick profile is described in this area. This reference section encompasses the ‘Marnes de Smail’ Formation, subdivided into four lithostratigraphic units (IA, IB, IC, and ID respectively) and dated of the Cenomanian (ammonites and coral), and the base of the ‘Dolomies de l’Oued Skhoun’ Formation (unit IIA), dated of the Lower Turonian (planktonic foraminifers). Both qualitative and quantitative analysis of foraminifers (planktonic and/or benthonic), ostracodes and of geochemical indices, lead us to reconstitute the evolution of both palaeoenvironmental and palaeobathymetrical changes during this time interval. Subsequently units IA, IB, IC and the lower part of unit ID (all Cenomanian) are displaying agglutinated benthonic foraminifers and complete ostracode shells, as evidence of a shelfal environment and weak hydrodynamism. Within these deposits microfaunal assemblages display a low-to-medium species diversity and a relatively high specimen abundance, supporting evidence of normal trophic conditions and water oxygenation. The upper part of unit ID (topmost Cenomanian), and unit IIA (basal Turonian) are documenting an environmental setting into deeper conditions, supported by the standard event succession already recorded in northern Africa, namely: the abundance of planktonic foraminifers, the occurrence of ‘filaments’ and the sudden reduction of ostracofauna. Furthermore the total carbonate isotope fluctuations (δ¹³C and δ¹⁸O) are documenting isotopic anomalies related to palaeoenvironmental changes. The δ¹³C results, coupled with those of TOC, are evidencing a low primary productivity while the δ¹⁸O data are supporting a temperature rise as the main potential drive of the onset of OAE2. These paleoenvironmental assertions are consistent with the regional paleogeographic context and are highlighting tethysian features.

BLEVE is one of major accidents observed in gas industry causing severe damage to people and environment. Its effects are manifested in three ways: shock wave propagation, fireball radiation and fragments projection. To assess these effects, risk decision-makers often use Quantitative Risk Analysis (QRA). In most cases, QRA data are obtained from empirical correlations. However, these correlations are not very satisfactory because they generally overestimate BLEVE effects and do not take into account geometry effects. In order to overcome the limitations of these empirical approaches, CFD modeling appears as a powerful tool able to provide more accurate data to better realize QRA. In this paper, the objective is to develop a CFD methodology in order to predict BLEVE thermal effects. Numerical simulations are carried out using the CFD code FDS. A sensitivity analysis of numerical models is performed in order to choose the right parameters allowing to model the fireball dynamics. The models retained are based on a single-step combustion using EDC model coupled with a LES turbulence model. Predictions show good agreement in comparison with results issued from three large-scale experiments. Furthermore, a case study on a propane accumulator in an Algerian gas processing unit is carried out.

In this paper, a new optically controlled tunneling field effect transistor (OC-TFET) based on SiGe/Si/Ge hetero-channel is proposed to improve optical commutation speed and reduce power consumption. An exhaustive study of the device switching behavior associated with different hetero-channel structures has been carried out using an accurate numerical simulation. Moreover, a new figure of Merit (FoM) parameter called optical swing factor that describes the phototransistor optical commutation speed is proposed. We demonstrate that the band-to-band tunneling effect can be beneficial for improving the device optical commutation speed. The impact of the Ge mole fraction of the SiGe source region on the device FoMs is investigated. It is found that the optimized design with 40% of Ge content offers the opportunity to overcome the trade-off between ultrafast and very sensitive photoreceiver performance, where it yields 48 mV/dec of optical swing factor and 155 dB of I ON /I OFF ratio. An overall performance comparison between the proposed OC-TFET device and the conventional designs is performed, where the proposed structure ensures high optical detectivity for very low optical powers (sub-1pW) as compared to that of the conventional counterparts. Therefore, the proposed OC-TFET provides the possibility for bridging the gap between improved optical commutation speed and reduced power consumption, which makes it a potential alternative for high-performance inter-chip data communication applications.

The article introduces the benefits and application features of Silvaco Technology Computer Aided Design‘TCAD’ tool to predict the performance of electrical components and their reliability. In this work, in order to improve the electrical parameters of MOS transistor such as, threshold voltage and flat band voltage, we have simulated Phosphorus and Arsenic diffusion profiles in three dimensions before and after thermal annealing in a highly doped polysilicon film using the simulator Silvaco TCAD based on Pearson type IV models. The model takes into account the distribution of vacancy mechanisms and effects related to high concentrations, such as the formation of clusters to study solid solubility limit. The results have been analyzed and discussed in order to extract depth of doping (Phosphorus and Arsenic) and they have been able to optimize the silicon oxide thickness, to reduce the penetration of doping. Based on earlier studies a study of the effect of solubility on these profiles was performed

Introduction : L’hépatocarcinome est une maladie tumorale grave et lourde, se greffant très souvent sur une cirrhose hépatique. L’amélioration de son pronostic exige d’abords la collecte d’un maximum d’informations à tous les stades de son évolution. Patients et méthodes : 63 cas d’hépato carcinome (CHC), ont été enregistrés entre juillet 2014 et février 2017. Une étude descriptive a été réalisée pour déterminer les caractéristiques de cette maladie dans notre région. Résultats : Tous les cas se sont développés sur un foie cirrhotique, d’origine virale. La tranche d’âge 60-70 ans est la plus touchée avec 23patients. La sex-ratio était de 1,17 en faveur des hommes. Deux régions se distinguent avec respectivement 24 et 14 % des cas. 81 % des patients étaient des stades localisés, 47 patients avaient des comorbidités, 38 avaient des stades Child A. Le diagnostic reposait sur les critères BCLC, 29 Patients étaient PS «0 », 21 PS «1». Le volume moyen était de 57,3 mm (28 mm - 137 mm). Les segments IV et V occupent la première place avec 7 nodules chacun. 37 patients replissant les critères requis pour la greffe hépatique étaient en attente, 27 parmi eux ont reçu une radiothérapie 3D focalisée. Les résultats sont très encourageants en matière de tolérance, de contrôle local et de survie avec en plus un impact positif sur la prolongation de la durée d’éligibilité pour la greffe hépatique. Conclusion : Une meilleure connaissance des aspects épidémiologiques et cliniques des CHC associée à une prise en charge précoce en passant par le dépistage va indiscutablement améliorer le pronostic jusque-là médiocre de ces tumeurs.

Reliable data transport is an essential requirement for many multimedia applications in wireless sensor networks. Actually, an efficient transport protocol for these applications must take into account not only reliability and energy consumption factors but also memory occupancy and data delivery delay. Recently, many research works have been conducted in this area, however the proposed protocols treat some of these aspects and neglect others. Contrarily, in this paper we present a novel transport solution designed to provide 100% reliability without making light of other factors. Through different mechanisms, we attempt to reach this objective with congestion avoidance and good performances in terms of energy consumption, delivery delay, and memory storage. The proposed protocol, called congestion avoidance with reliable transmission and energy efficiency (CARTEE), attains these goals through several mechanisms, namely: fixed sliding window transmission, alternative implicit/explicit acknowledgement, a new congestion detection technique, and distributed transmission rate adjustment. To evaluate the proposed protocol, we have conducted simulations using ns-3. The obtained results confirm the efficiency and scalability of CARTEE and demonstrate that it outperforms the recent proposed transport protocols in terms of reliability, congestion avoidance, data cache occupancy, and latency.