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159篇 您的检索式:作者名="Usama"
    题名 作者 年代 出处 被引量
1利用瞬变电磁和多频电磁方法监测地下水位及其对Hawara遗址的影响(英文)显示文摘利用瞬变电磁(TEM)和地面电磁(GEM)方法,本文研究了埃及Hawara遗址区的地下水对遗址的影响.这个遗址包括Hawara金字塔、北区墓地、以及被称作'迷宫'的南区墓葬场所.现今Hawara遗址已经完全荒废,被耕作区和Bahr Wahba运河包围.地表水和地下水会破坏Hawara金字塔和'迷宫'遗址的地基,现在金字塔入口已被淹没至地面下约6 m深处.本文在耕作区、金字塔以及'迷宫'等三个地区进行了TEM勘察;在'迷宫'地区进行了GEM勘察.综合分析以上两种勘察数据,我们发现,农业灌溉是浸入到地下的水的主要来源;本地区地下水位随着观测点及海拔的不同,在地面以下2~7 m之间变化.Usama MASSOUD A.M.ABBAS H.S.A.MESBAH El Said A.RAGAB Λyman TAHA 2010地球物理学报2010,53,3:10
2Vascular calcification:When should we interfere in chronic kidney disease patients and how?显示文摘Chronic kidney disease(CKD) patients are endangered with the highest mortality rate compared to other chronic diseases. Cardiovascular events account for up to 60% of the fatalities. Cardiovascular calcifications affect most of the CKD patients. Most of this calcification is related to disturbed renal phosphate handling. Fibroblast growth factor 23 and klotho deficiency were incriminated in the pathogenesis of vascular calcification through different mechanisms including their effects on endothelium and arterial wall smooth muscle cells. In addition, deficient klotho gene expression, a constant feature of CKD, promotes vascular pathology and shares in progression of the CKD. The role of gut in the etio-pathogenesis of systemic inflammation and vascular calcification is a newly discovered mechanism. This review will cover the medical history, prevalence, pathogenesis, clinical relevance, different tools used to diagnose, the ideal timing to prevent or to withhold the progression of vascular calcification and the different medications and medical procedures that can help to prolong the survival of CKD patients.Usama Abdel Azim Sharaf El Din Mona Mansour Salem Dina Ossama Abdulazim 2016World Journal of Nephrology2016,5,5:10
3Surgical treatment of ulcerative colitis:Ileorectal vs ileal pouch-anal anastomosis显示文摘Total proctocolectomy with ileal pouch-anal anastomosis(IPAA) is the current gold standard in the surgical treatment of ulcerative colitis(UC) refractory to medical management. A procedure of significant magnitude carries its own risks including anastomotic failure, pelvic sepsis and a low rate of neoplastic degeneration overtime. Recent studies have shown that total colectomy with ileorectal anastomosis(IRA) has been associated with good long-term functional results in a selected group of UC patients amenable to undergo a strict surveillance for the relatively high risk of cancer in the rectum. This manuscript will review and compare the most recent literature on IRA and IPAA as it pertains to postoperative morbidity and mortality, failure rates, functional outcomes and cancer risk.Daniele Scoglio Usama Ahmed Ali Alessandro Fichera 2014World Journal of Gastroenterology2014,20,37:9
4Stop chronic kidney disease progression: Time is approaching显示文摘Progression of chronic kidney disease(CKD) is inevitable. However, the last decade has witnessed tremendous achievements in this field. Today we are optimistic; the dream of withholding this progression is about to be realistic. The recent discoveries in the field of CKD management involved most of the individual diseases leading the patients to end-stage renal disease. Most of these advances involved patients suffering diabetic kidney disease, chronic glomerulonephritis, polycystic kidney disease, renal amyloidosis and chronic tubulointerstitial disease. The chronic systemic inflammatory status and increased oxidative stress were also investigated. This inflammatory status influences the antisenescence Klotho gene expression. The role of Klotho in CKD progression together with its therapeutic value are explored. The role of gut as a major source of inflammation, the pathogenesis of intestinal mucosal barrier damage, the role of intestinal alkaline phosphatase and the dietary and therapeutic implications add a novel therapeutic tool to delay CKD progression.Usama Abdel Azim Sharaf El Din Mona Mansour Salem Dina Ossama Abdulazim 2016World Journal of Nephrology2016,5,3:6
5Isolation and characterization of marine-derived actinomycetes with cytotoxic activity from the Red Sea coast显示文摘Objective: To isolate and evaluate the cytotoxic activity of different actinomycetes species isolated from the Red Sea coast in Sharm el-Sheikh, Egypt.Methods: Forty actinomycetes strains were isolated from different sediments and seawater samples collected from the Red Sea coast in Egypt. Actinomycetes were recognized by morphological and microscopic examinations. Cell viability and cytotoxicity induced by the crude extracts on breast cancer cell lines MDA-MB-231 were assessed using methylene blue assay. The strains with promising cytotoxic activity were identified by sequencing and amplifying the 16 S r RNA genes. The antibacterial activities of the crude extracts were performed using Kirby–Bauer disc diffusion method.Results: The results indicated that five ethyl acetate extracts exhibited cytotoxicity towards breast cancer cell lines MDA-MB-231. The highest cytotoxic activity was found for the ethyl acetate extracts of EGY2 and EGY39. The isolate EGY3 was identified as a new Streptomyces species, while the actinomycete EGY22 was found to be a member of the genus Nocardiopsis sp. The crude extract of the isolate EGY8 showed slightly high antimicrobial activity against different test microorganisms.Conclusions: The results of the present study reveal that marine sediments of the Red Sea are a potent source of novel species of actinomycetes. The isolates may be useful in discovery of novel bioactive compounds and an important step in the development of microbial natural product research.Mohamed Saleh Abdelfattah Mohammed Ismail Youssef Elmallah Usama Wahid Hawas Lamia Taha Abou El-Kassema Mennat Allah Gamal Eid 2016Asian Pacific Journal of Tropical Biomedicine2016,6,8:3
6Applications of synchrophasor technologies in power systems显示文摘Synchrophasors are time-synchronized electrical measurements that represent both the magnitude and phase angle of the electrical sinusoids. Synchrophasors are measured by fast time-stamped devices called phasor measurement units(PMUs) to constitute the basis of realtime monitoring and control actions in the electric grid.Due to its enhanced situational awareness capabilities,many applications of PMUs are presented in the literature in the past decades. This paper presents a comprehensive summary of synchrophasor technology, its architecture,optimal placement techniques and its applications in electric power transmission and distribution systems. These applications include wide-area situational awareness and monitoring, state estimation, fault location and protective relaying, islanding detection etc. This review also covers some of the existing challenges in its implementation and its potential applications.Muhammad Usama USMAN M. Omar FARUQUE 2019Journal of Modern Power Systems and Clean Energy2019,7,2:3
7The KDD process for extracting useful knowledge from volumes of data显示文摘Usama Fayyad Gregory Piatetsky-Shapiro Padhraic Smyth 1996Communications of the ACM1996,,11:2
8Exploring the relationship between urbanization, energy consumption, and CO 2 emission in MENA countries显示文摘Usama Al-mulali Hassan Gholipour Fereidouni Janice Y.M. Lee Che Normee Binti Che Sab 2013Renewable and Sustainable Energy Reviews2013,,:2
9Risk and Location of Cancer in Patients With Preoperative Colitis-Associated Dysplasia Undergoing Proctocolectomy显示文摘Ravi P. Kiran Usama Ahmed Ali Pasha J. Nisar Wisam Khoury Jinyu Gu Bo Shen Feza H. Remzi Jeffrey P. Hammel Ian C. Lavery Victor W. Fazio John R. Goldblum 2014Annals of Surgery2014,,2:2
10FINITE ELEMENT ANALYSIS FOR CHIP FORMATION IN HIGH SPEED TURNING OPERATIONS BY ARBITRARY LAGRANGIAN EULERIAN METHOD显示文摘为当直角地用 poly 水晶的立方的氮化硼(PCBN ) 在 49HRC 用机器制造 AISI H13 工具钢时,转操作的高速度的一个二维的有限元素(FE ) 模型被描述。一个任意的 Lagrangian Eulerian (淡色啤酒) 方法被采用了它不与传统的 Lagrangian 途径对比需要任何薄片分离标准。通过 FE 模拟,温度和压力分布被介绍那能在预言工具生命并且改进进程参数是有用的。结果证明高温度由于 PCBN 工具的高热的电导率作为与 shear 地区温度相比沿着工具耙子脸被产生。USAMA Umer 2006Chinese Journal of Mechanical Engineering2006,19,4:2
11Job schedulers for Big data processing in Hadoop environment: testing real-life schedulers using benchmark programs显示文摘Mohd Usama Mengchen Liu Min Chen 2017Digital Communications and Networks2017,3,4:2
12Laparoscopic Anterior 180-Degree Versus Nissen Fundoplication for Gastroesophageal Reflux Disease: Systematic Review and Meta-Analysis of Randomized Clinical Trials显示文摘Joris A. Broeders David J. Roks Usama Ahmed Ali David I. Watson Robert J. Baigrie ZhanGuo Cao Jens Hartmann Guy J. Maddern 2013Annals of Surgery2013,,5:2
13Aggregate characteristics of callus derived from woody plant Eucommia ulmoides显示文摘Kazuhiko M Usama I A Yasunori T 2004Biochemical Engineering Journal2004,21,:1
14A rapid method of grafting skin on tails of mice 显示文摘Bailey DW Usama B 1960Transplant Ball1960,7,:1
15Triterpene saponins from Salsola imbricata显示文摘Arafa I. Hamed Milena Masullo Mohamed G. Sheded Usama A. Mahalel Moatz M. Tawfik Angela Perrone Sonia Piacente 2011Phytochemistry Letters2011,,3:1
16Cholecystectomy versuseholecysto lithotomy for cholelith iasis in childhood:long-term outcome显示文摘Diane DC Usama AKL Martin C 0,,13:1
17Antioxidant and Antiproliferative Activity of Diospyros lotus L. Extract and Isolated Compounds显示文摘Monica Rosa Loizzo Ataa Said Rosa Tundis Usama W. Hawas Khaled Rashed Federica Menichini Natale Giuseppe Frega Francesco Menichini 2009Plant Foods for Human Nutrition2009,,4:1
18Integrated geoelectrieal survey for groundwater and shallow subsurface e- valuation: case study at Siliyin spring, E1-Fayoum, Egypt 显示文摘Mohamed Metwaly Gad El-Qady Usama Massoud 2011Arabian Journal of Geosciences2011,4,3:1
19Hierarchical Clustering Algorithms for Document Datasets显示文摘Ying Zhao George Karypis Usama Fayyad 2005Data Mining and Knowledge Discovery2005,,2:1
20Data mining and KDD:Promise and challenges显示文摘Fayyad Usama Stolorz 1997Future Generation Computer Systems1997,13,23:1
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