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Karia Ba Mohamed, Morocco

Drissi L.B.,Mohammed iversityRabat | Drissi L.B.,Mohammed iversityRabat | Sadki K.,Mohammed iversityRabat
Mechanics of Materials

Abstract Using ab initio density functional theory, the effect of hydrogen arrangement on the elastic properties of silicene-graphene hybrid is studied. Mechanical stability, elastic constants and sound velocities of pure and five configurations of hydrogenated SiC sheet, namely, chair, table, boat, zigzag and armchair, are explicitly examined. To reveal the anisotropic properties of the six structures, the polar plots of Young's modulus, Poisson ratio and acoustic waves speed are given. Compared to graphene, it is shown that all the isotropic systems are less stiffer with lower in-plane Young's modulus and stronger with their larger Poisson ratio, moreover, their compressional and shear waves propagate faster. The analysis of linear elastic behavior shows that the armchair configuration has an auxetic structure. The result of this work could be used for the design of future silicane-graphane based nanodevices with potentially large technological impact in nanomechanics. © 2015 Elsevier Ltd. Source

Tarchouli M.,Mohammed iversityRabat | Zentar A.,Mohammed iversityRabat | Ratbi M.B.,Mohammed iversityRabat | Bensal A.,Mohammed iversityRabat | And 5 more authors.
BMC Research Notes

Background: Retrorectal tumors in adults are very rare and little known condition. These tumors, often misdiagnosed or mistreated, should be completely excised because of the potential for malignancy or infection. A suitable operative approach is the key to the successful surgical management. Case presentation: We report the case of a 45-year-old Arab male who presented with chronic pelvic pain accompanied by straining to defecate and dysuria. The clinical examination showed a painless mass in the left perineal area. Pelvic magnetic resonance imaging and computed tomography scan demonstrated a huge and well-limited pelvic mass causing displacement and compression of the rectum and bladder. Although the large size of the mass (>7 cm in the greater diameter), it was successfully and completely excised through only perineal approach without undertaking coccygectomy or sacrectomy. The histopathological study revealed a low-grade leiomyosarcoma. The patient is currently in 4-years follow-up with no signs of recurrence or metastasis. Conclusion: Even large retro-rectal tumors may be successfully excised by the perineal approach especially in carefully selected patients, but require extensive knowledge of pelvic anatomy and expertise in pelvic surgery. © 2015 Tarchouli et al. Source

Tarchouli M.,Mohammed iversityRabat | Ait Ali A.,Mohammed iversityRabat | Ratbi M.B.,Mohammed iversityRabat | Belhamidi M.S.,Mohammed iversityRabat | And 7 more authors.
BMC Research Notes

Background: Insulinomas are rare pancreatic endocrine tumors. Most are benign and solitary. However, the nonspecific symptoms and small size of these tumors led to difficulties of diagnosis and localization. Case presentation: We present two Arab patients with pancreatic long-standing insulinoma. Both patients presented episodic hypoglycemic symptoms respectively during 10 and 2 years. Biochemical and morphological workup detected localized pancreatic insulinoma. Open procedure surgery was done for the two patients and insulinomas were successfully removed by enucleation. Conclusion: Insulinoma remains a diagnostic challenge to practitioners. Diagnosis of suspected cases is easily confirmed by standard endocrine tests, especially the supervised fasting test. Accurate preoperative localization is essential for more effective and safest surgery. © 2015 Tarchouli et al. Source

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