242 research outputs found
Paraplégie compliquant une plaie abdominale antérieure par arme blanche
Les traumatismes médullaires sont des complications rares des plaies abdominales antérieures par arme blanche. Son diagnostic est difficile parfoisretardé. L'imagerie par résonance magnétique reste l'examen de choix. Le traitement dépend du tableau clinique et de la gravité de la souffrance médullaire. Le pronostic est corrélé à l'étendue et à la nature de la lésion médullaire. Nous rapportons un cas exceptionnel d'un traumatisme médullaire chez une patiente victime d'une plaie abdominale antérieure par arme blanche
Chemical synthesis and magnetic properties of monodisperse cobalt ferrite nanoparticles
In this work, a successful synthesis of magnetic cobalt ferrite (CoFe2O4)
nanoparticles is presented. The synthesized CoFe2O4 nanoparticles have a
spherical shape and highly monodisperse in the selected solvent. The effect of
different reaction conditions such as temperature, reaction time and varying
capping agents on the phase and morphology is studied. Scanning transmission
electron microscopy showed that the size of these nanoparticles can be
controlled by varying reaction conditions. Both X-ray diffraction and energy
dispersive X-ray spectroscopy corroborate the formation of CoFe2O4 spinel
structure with cubic symmetry. Due to optimized reaction parameters, each
nanoparticle was shown to be a single magnetic domain with diameter ranges from
6 to 16 nm. Finally, the magnetic investigations showed that the obtained
nanoparticles are superparamagnetic with a small coercivity value of about 315
Oe and a saturation magnetization of 58 emu/g at room temperature. These
results make the cobalt ferrite nanoparticles promising for advanced magnetic
nanodevices and biomagnetic applications.Comment: 10 pages, 9 figure
Multi-Band Rectangular Dielectric Resonator Antenna for Wireless communications
In this paper, a Multi-band rectangular dielectric resonator antenna is presented. The fed method consists on a probe which is inserted through the dielectric resonator. The dielectric resonator has a small size (20 mm Ă 20 mm Ă 7 mm). The simulated bandwidths are 8.51 â 8.72 GHz, 9.90 â 11.58 GHz, and 13.01 â 13.11 GHz. The total fractional obtained bandwidth is 18.79%
Giant fibroadenoma of the breast in late third trimester
Giant fibroadenomas (GFs) occurring during pregnancy are extremely rare, and only a few cases have been reported. Although it is a benign condition, it often requires biopsy or even surgery to exclude malignancy. The authors report a new case of GF in a 29âyearâold pregnant woman with a family history of breast cancer. She presented at 37 weeks of gestation with a large mass in her left breast. Truâcut biopsy was suggestive of fibroadenoma. After delivery, enucleation of the mass was performed, and histology confirmed the previous diagnosis. Benign neoplasms should be suspected in any pregnant woman with a rapidly enlarging breast mass. Early surgical excision should be offered as a standard treatment to avoid structural damage to the breast and the need for reconstructive surgery.Keywords: Breast mass; giant fibroadenoma; pregnancy; Truâcut biops
Magnetic studies of amorphous Fe-Dy-B ribbons
We have studied the magnetization of melt spun amorphous Fe80âxDyxB20 alloys with 0 †x †7.5 under magnetic ïŹelds up to 6T, and have analyzed the results at 4.2 K on the basis of the random magnetic anisotropy model. Exchange constant and local random anisotropy KL were evaluated. Using the SarkisÂŽs model, the local anisotropies per atom are found to be 1.75 107 and 4 107 erg/cm3 for Fe and Dy, respectively.We have studied the magnetization of melt spun amorphous Fe80âxDyxB20 alloys with 0 †x †7.5 under magnetic ïŹelds up to 6T, and have analyzed the results at 4.2 K on the basis of the random magnetic anisotropy model. Exchange constant and local random anisotropy KL were evaluated. Using the SarkisÂŽs model, the local anisotropies per atom are found to be 1.75 107 and 4 107 erg/cm3 for Fe and Dy, respectively
Artificial Kagome Arrays of Nanomagnets: A Frozen Dipolar Spin Ice
Magnetic frustration effects in artificial kagome arrays of nanomagnets are
investigated using x-ray photoemission electron microscopy and Monte Carlo
simulations. Spin configurations of demagnetized networks reveal unambiguous
signatures of long range, dipolar interaction between the nanomagnets. As soon
as the system enters the spin ice manifold, the kagome dipolar spin ice model
captures the observed physics, while the short range kagome spin ice model
fails.Comment: 4 pages, 4 figures, 1 tabl
Magnetic properties in amorphous Co95ÂxDyxZr5 thin films
Amorphous Co95-xDyxZr5 thin films were prepared by RF sputtering and their magnetic properties were studied as a function of temperature and for the composition range 0<x<30. The mean field theory has been used to explain the temperature dependence of the magnetization. The exchange interactions between Co-Co and Dy-Co atom pairs have been evaluated. The magnetic phase diagrams are presented.Amorphous Co95-xDyxZr5 thin films were prepared by RF sputtering and their magnetic properties were studied as a function of temperature and for the composition range 0<x<30. The mean field theory has been used to explain the temperature dependence of the magnetization. The exchange interactions between Co-Co and Dy-Co atom pairs have been evaluated. The magnetic phase diagrams are presented
Les entĂ©robactĂ©ries sĂ©crĂ©trices de bĂ©ta-Lactamases Ă spectre Ă©tendu en urologie Ă lâHĂŽpital Ibn Sina de Rabat
LâantibiorĂ©sistance croissante des bactĂ©ries responsables des infections urinaires limite le choix des antibiotiques en chirurgie urologique. Parmi ces germes sont retrouvĂ©es les entĂ©robactĂ©ries productrices de bĂ©talactamases Ă spectre Ă©largi (EBLSE) dont la progression devient inquiĂ©tante. Lâobjectif de cette Ă©tude Ă©tait de dĂ©terminer la prĂ©valence des entĂ©robactĂ©ries sĂ©crĂ©trices de BLSE dans les prĂ©lĂšvements dâurines en pĂ©ri opĂ©ratoire de chirurgie urologique. Il sâagissait dâune Ă©tude rĂ©trospective rĂ©alisĂ©e au centre hospitalier universitaire Ibn Sina de Rabat sur une pĂ©riode de 19 mois. Nâont pas Ă©tĂ© inclus dans cette Ă©tude, les prĂ©lĂšvements urinaires rĂ©alisĂ©s Ă dans un laboratoire externe. Les donnĂ©es Ă©taient traitĂ©es avec le logiciel SPSS, les comparaisons faites par test du Khi deux ou de Student avec un seuil de risque alpha fixĂ© Ă 5%. Sur 830 prĂ©lĂšvements positifs 656 Ă©taient des entĂ©robactĂ©ries soit 79 % des germes isolĂ©s. E.coli reprĂ©sentait 53,2%, K.pneumoniae 28%, E.cloacae 7,8% et P.mirabillis 7%. Les producteurs de BLSE reprĂ©sentaient 17,5% de lâĂ©chantillon avec: E.coli (12,3%), K.pneumoniae (23,6%), E.cloacae (39,2%) et P.mirabillis (6,7%). On note une augmentation de la prĂ©valence des entĂ©robactĂ©ries BLSE entre 2008 et 2009 : respectivement de 14,4% Ă 22,3% des entĂ©robactĂ©ries isolĂ©es; pour E.coli de 32,76% Ă 40,68% et pour K.pneumoniae de 34,48% Ă 42,37%. Plusieurs facteurs de risque dâacquisition des EBLSE sont rapportĂ©s dans la littĂ©rature, dont principalement lâutilisation antĂ©rieure dâantibiotiques par ces patients. Une politique de gestion rationnelle des antibiotiques en ambulatoire et au sein des Ă©tablissements de santĂ© contribuera Ă une rĂ©duction de lâĂ©mergence des germes rĂ©sistant
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