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Query Expansion in XML Information Retrieval : a new Approach for terms selection
No full textQuery Expansion is an important component for information retrieval systems. It makes possible the reformulation of the initial user query by adding new terms. In this paper, we propose a new approach for term selection in the relevance feedback process. This approach, based on Rocchio formula, is an adaptation to the XML information retrieval context. It can resolve two major problems specific to the XML information retrieval: the overlapping problem in the list of retrieved elements; and the problem of inclusion of irrelevant elements in the selection of new query term
Multiple spinal metastases from a well-differentiated liposarcoma of the iliac wing: a case report
No full textLiposarcoma (LPS) is an uncommon connective tissue tumor arising from lipoblast cells. Well-differentiated liposarcoma (WDLPS) represents the most frequent subtype. It mostly occurs in the limbs or retroperitoneum of elderly individuals and typically has no propensity to metastasize, unless it undergoes dedifferentiatio
Physicochemical Profile of Essential Oil of Daucus carota
No full textEssential oils have a significant antimicrobial activity. These oils can successfully replace the antibiotics. So, the
microorganisms show their inefficiencies resistant for the antibiotics. For this reason, we study the physicochemical analysis and antimicrobial activity of the essential oil of Daucus carota. The
extraction is done by steam distillation of water which brought us a very significant return of 4.65%. The analysis of the essential oil is performed by GC / MS and has allowed us to identify 32 compounds
in the oil of D. carota flowering tops of Bouira. Three of which are in the majority are the α-Pinene (22.3%), the carotol (21.7%) and the limonene (15.8%
Electronic stopping power data of heavy ions in polymeric foils in the ion energy domain of LSS theory
No full textCompetence of cimex lectularius bed bugs for the transmission of bartonella quintana, the agent of trench fever
No full textBartonella quintana, the etiologic agent of trench fever and other human diseases, is transmitted by the feces of body lice. Recently, this bacterium has been detected in other arthropod families such as bed bugs, which begs the question of their involvement in B. quintana transmission. Although several infectious pathogens have been reported and are suggested to be transmitted by bed bugs, the evidence regarding their competence as vectors is unclear. Bed bugs at the adult and instar developmental stages were fed three successive human blood meals inoculated with B. quintana bacterium from day one (D1) to D5; subsequently they were fed with pathogen-free human blood until the end of the experiment. Bed bugs and feces were collected in time series, to evaluate their capacities to acquire, multiply and expel viable B. quintana using molecular biology, immunohistochemistry and cultures assays. B. quintana was detected molecularly in 100% of randomly selected experimentally infected bed bug specimens (D3). The monitoring of B. quintana in bed bug feces showed that the bacterium was detectable starting on the 3rd day post-infection (pi) and persisted until day 18±1 pi. Although immunohistochemistry assays localized the bacteria to the gastrointestinal bed bug gut, the detection of B. quintana in the first and second instar larva stages suggested a vertical non-transovarial transmission of the bacterium. The present work demonstrated for the first time that bed bugs can acquire, maintain for more than 2 weeks and release viable B. quintana organisms following a stercorarial shedding. We also observed the vertical transmission of the bacterium to their progeny. Although the biological role of bed bugs in the transmission of B. quintana under natural conditions has yet to be confirmed, the present work highlights the need to reconsider monitoring of these arthropods for the transmission of human pathogen
Influence of nonlinear resilient models of unbound aggregates on analysis and performance of road pavements
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Perceived factors affecting customers attitudes toward electronic shopping : an empirical study
No full textتكامل أنواع نظم المعلومات وأثره في ترشيد اتخاذ القرارات : دراسة ميدانية
Get PDFبيبليوغرافيا ص. 279-293. ملاحقإن ترشيد عملية اتخاذ القرارات تعتمد بشكل أساسي على نوعية وجودة المعلومات التي يُستند إليها في اكتشاف المشاكل والصعوبات وتحليلها ومحاولة الوصول إلى اتخاذ القرار الصائب بشأنها، هذه المعلومات، والتي يكون بمقدورها الاستجابة الكاملة لاحتياجات متخذ القرار، تتحقق من خلال نظم معلومات حديثة ومتكاملة، تم تصميمها وفق أسس علمية وبما يخدم متطلبات المستوى الإداري الذي يستخدمها، بحيث يتم التعامل معها من طرف أفراد ذوي خبرة وكفاءة عالية، يحرصون على دقة البيانات المدخلة للنظم، حتى تشكل مخرجاتها المرجعية والإسناد الكامل لمتخذي القرارات، وتكون مستوفية لكافة المتطلبات المعلوماتية اللازمة لدراسة المشكلة محل القرا
Valorisation énergétique de la biomasse dans l'ecosysteme oasien -impact environnemental et socio-économique
No full text159 p. : ill. ; 30 cmL'écosystème oasien constitue un modèle écologique caractéristique des zones arides. Il repose sur un savoir-faire multiséculaire de gestion et d'usage des ressources hydriques (souvent rares), la maîtrise d'un système agro-écologique complexe, le maintien durable de la fertilité du sol et l'utilisation de techniques culturales spécifiques au palmier dattier ainsi qu'aux cultures sous-jacentes. La biomasse oasienne générée par ces différentes opérations et basée essentiellement sur les sous-produits phoenicicoles, pourrait présenter de nombreux atouts (disponibilité, biodiversité, aspect renouvelable et potentiel énergétique intéressant). Ainsi, une valorisation énergétique de cette ressource (biomasse oasienne) exigerait une connaissance approfondie et précise de tous ses constituants ainsi que celle du milieu qui l'abrite (agrosystème oasien). Vu la rareté d'études sur cette biomasse particulière et l'absence de données sur certains de ses aspects, l'identification, la quantification et la caractérisation chimiques et énergétique de ce gisement est : la première, et la plus importante étape d'investigation sur l'étude du potentiel énergétique de cette ressource renouvelable. Cette étude s'est articulée en quatre étapes : La première est la caractérisation du système de production oasien qui est le générateur de gisement biomasse dans cet espace. Elle permettra l'identification des principaux gisements et de leurs constituants. La deuxième étape découle de la précédente, et consiste en l'évaluation qualitative du gisement considéré. Enfin, la caractérisation chimique et thermique constituera les deux dernières phases de cette étud