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An efficient oxidation of benzylic and alicylic compounds with water-soluble copper catalysts in t-butyl hydroperoxide at room temperature

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Chinese Chemical Letters 2011年第6期22卷 691-693页

作者： Ateeq Rahman S.m.al Zahrani abdel aziz Nait Ajjou College of Engineering Department of Chemical Engineering King Saud University Department of Chemistry and Biochemistry University of moncton

The water soluble catalytic system comprising of CuCl_2 and 2,2-biquinoline-4,4-dicarboxylic acid dipotassium salt（BQC） is highly efficient organic metallic catalysts for selective oxidation of benzyiic and alicycii... 详细信息

关键词： Oxidation Bibenzyl allyl benzene Indan 2-Biquinoline-4 4-dicarboxylic acid dipotassium salt(BQC) Tetrabutyl ammonium bromide(TBAC)

Pancreatits after endoscopic retrograde cholangio-pancreatography

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World Journal of Gastroenterology 2007年第19期13卷 2655-2668页

作者： Ayman m abdel aziz Glen A Lehman Division of Gastroenterology and Hepatology Indiana University Medical Center United States

Pancreatitis is the most common complication after endoscopic retrograde cholangio-pancreatography (ERCP); the reported incidence of this complication varies from less than 1% to 40%, but a rate of 4%-8% is reported in most prospective studies involving non-selected patients. Differences in criteria for defining pancreatitis, methods of data collection, and patient populations (i.e. number of high-risk patients included in the published series) are factors that are likely to affect the varying rates of post-ERCP pancreatitis. The severity of post-ERCP pancreatitis (PEP) can range from a minor inconvenience with one or two days of added hospitalization with full recovery to a devastating illness with pancreatic necrosis, multiorgan failure, permanent disability, and even death. although, most episodes of PEP are mild (about 90%), a small percentage of patients (about 10%) develop moderate or severe pancreatitis. In the past, PEP was often viewed as an unpredictable and unavoidable complication, with no realistic strategy for its avoidance. New data have aided in stratifi cation of patients into PEP risk categories and new measures have been introduced to decrease the risk of PEP. As most ERCPs are performed on an outpatient basis, the majority of patients will not develop PEP and can be discharged. alternatively, early detection of those patients who will go on to develop PEP can guide decisions regarding hospital admission and aggressive management. In the last decade, great efforts have been addressed toward prevention of this complication. Points of emphasis have included technical measures, pharmacological prophylaxis, and patient selection. This review provides a comprehensive, evidence-based assessment of published data on PEP and current suggestions for its avoidance.

关键词： Endoscopic retrograde cholangiopancreatography Post-ERCP pancreatitis

Some Geometric Invariants of Pseudo-Spherical Evolutes in the Hyperbolic 3-Space

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Computers, materials & Continua 2018年第12期57卷 389-415页

作者： H.S.abdel-aziz m.Khalifa Saad A.A.abdel-Salam mathematics Department Faculty of ScienceSohag University82524SohagEgypt mathematics Department Faculty of ScienceIslamic University of Madinah170 El-MadinahKSA

In this paper,we study the pseudo-spherical evolutes of curves in three dimensional hyperbolic *** use techniques from singularity theory to investigate the singularities of pseudo-spherical evolutes and establish some relationships between singularities of these curves and geometric invariants of curves under the action of the Lorentz ***,we defray with illustration some computational examples in support our main results.

关键词： Pseudo-spherical evolutes evolute curves hyperbolic 3-space

On Special Curves According to Darboux Frame in the Three Dimensional Lorentz Space

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Computers, materials & Continua 2018年第3期54卷 229-249页

作者： H.S.abdel-aziz m.Khalifa Saad math.Dept. Faculty of ScienceSohag University82524 SohagEgypt. math.Dept. Faculty of ScienceIslamic University of Madinah170 El MadinahKSA

In the light of great importance of curves and their frames in many differentbranches of science, especially differential geometry as well as geometric properties andthe uses in various fields, we are interested here to study a special kind of curves calledSmarandache curves in Lorentz 3-space. Then, we present some characterizations for thesecurves and calculate their Darboux invariants. moreover, we classify TP, TU, PU andTPU-Smarandache curves of a spacelike curve according to the causal character of thevector, curve and surface used in the study. Besides, we give some of differential geometricproperties and important relations between that curves. Finally, to demonstrate ourtheoretical results a computational example is given with graph.

关键词： Smarandache curves spacelike curve timelike surface Darboux frame

Spontaneous bacterial peritonitis:risk factors and causative organisms

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Asian Pacific Journal of Tropical medicine 2009年第6期2卷 52-58页

作者： mahmoud m.al-Bendary mahmoud abdel-aziz Waleed A al-Sherbeeny Raghda El-Sayed Farag abdel-Hady El-Gilany mohammad Hosam Eldeen Zaghloul Tropical medicine Unit Community Medicine DepartmentCollege of MedicineMansoura UniversityEgypt Clinical Pathology Department College of MedicineMansoura UniversityEgypt

Objective:To determine the prevalent pathogens responsible for spontaneous bacterial peritonitis(SBP) and their sensitivity pattern,to test the efficiency of different culture techniques in microbial isolation,and to study the diagnostic predictors of such ***:One hundred eight SBP episodes from 92 adult patients were compared to 88 cirrhotic ascites patients cross - matched with age and sex without *** fluid was subjected to cytological,biochemical examination and culture on both conventional and blood culture bottles at the bedside for bacterial identification and antimicrobial susceptibility ***:The prevalence of SBP was 25.02%.Logistic regression analysis revealed that;previous SBP episode,low ascitic fluid protein levels, high serum creatinine and low serum.albumin levels were the independent significant predictors of *** forty - five per cent of SBP episodes were detected by conventional culture compared to 73.15%by modified technique with a significant *** - negative bacteria were the cause of SBP in 46(58.23%) culture positive *** coli and Staphylococcus aureus were the most commonly detected organisms. Resistance to different antibiotics was ***:Culture of ascitic fluid in blood culture bottles at bedside increases the sensitivity of SBP *** is a recent increase in Gram - positive pathogen with emergence of multidrug *** recent changes may have an impact on guidelines for management and treatment of SBP in our locality.

关键词： Spontaneous bacterial peritonitis Paracentesis Bedside inoculation Blood bottle culture

Impact of different nano additives on performance, combustion, emissions and exergetic analysis of a diesel engine using waste cooking oil biodiesel

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Propulsion and Power Research 2022年第2期11卷 209-223页

作者： m.S.Gad mostafa m.abdel aziz Hatem Kayed mechanical Engineering Department Faculty of EngineeringFayoum UniversityEgypt mechanical Engineering Department Institute of Aviation Engineering and TechnologyGizaEgypt mechanical Power Engineering Department Faculty of EngineeringCairo University12613Egypt

Biodiesel is derived from waste cooking oil (WCO) by transesterification. methylester was prepared by mixing diesel and biodiesel oils as 20% by volume. Nano particles asTiO2, al2O3 and CNTs were blended with biodiesel blend at different concentrations of 25,50, and 100 mg/l to enhance the physicochemical fuel characteristics to obtain clean and effi-cient combustion performance. An experimental setup was incorporated into a diesel engine toinvestigate the influence of these nano-materials on engine performance, exergy analysis, combustion characteristics and emissions using WCO biodiesel-diesel mixture. Enriching methylester mixture with 100 ppm titanium, alumina and CNTs (B20T100, B20A100 andB20C100) increased the thermal efficiency by 4%, 6% and 11.5%, respectively compared toB20. Biodiesel blending with nano additives B20T100, B20A100 and B20C100 decreasedthe emissions of CO (11%, 24% and 30%, respectively), HC (8%, 17% and 25%, respectively)and smoke (10%, 13% and 19%, respectively) compared to B20. However, the noticeable increase of NOx was estimated by 5%, 12% and 27% for B20T100, B20A100 and B20C100,respectively. Finally, the results showed the rise in peak cylinder pressure by 5%, 9% and 11% and increase in heat release rate by 4%, 8% and 13% for B20T100, B20A100 andB20C100, respectively. The fuel exergy of B20T100, B20A100 and B20C100 are lower thanbiodiesel blend B20 by 6.5%, 16% and 23% but the exergetic efficiency are increased by 7%,19% and 30% at full load about B20.

关键词： Waste cooking oil(WCO) Nano additives Engine performance Exergy Combustion characteristics Emissions

Performance,emissions and exergy analyses of adding CNTs to various biodiesel feedstocks

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Propulsion and Power Research 2022年第4期11卷 511-526页

Extraction of biodiesel from waste cooking oil,jatropha,and corn oils is done by *** and biodiesel were blended at 20%volume ratio to make methyl *** doses of 25,50,and 100 mg/l,carbon nanotubes(CNTs)was mixed with biodiesel *** objective of the present research is to examine experimentally a diesel engine performance,combustion characteristics,exergy and emissions analyses with inclusion of nano additive to various methyl ester *** ester blend is enriched with CNTs as JB20C100,WB20C100 and CB20C100 where the improvements in thermal efficiency are raised about biodiesel mixture by 9%,13%and 15%,*** of 100 ppm of CNTs to biodiesel blends achieves the greatest reductions in CO(14%,22%and 30%),HC(16%,20%and 25%),and smoke emissions(15%,19%and 23%)for JB20C100,WB20C100 and CB20C100,*** comparing with B20,blending 100 ppm CNTs with JB20,CB20,and WB20 obtained the highest increases in cylinder pressure of 3%,5%,and 10%,as well as the highest increases in heat release of 4%,7%,and 11%,*** downside of CNTs addition achieves a rise in NOx emissions by 10%,17%,and 22%for JB20C100,WB20C100,and CB20C100,*** efficiency increases by 8%,19%,and 24%for B20T100,B20A100,and B20C100,*** index improvements achieve 1.5%,5%and 6.5%,for B20T100,B20A100,and B20C100,***20 with CNTs of 100 ppm is highly recommended for improving engine performance,combustion,and exergy characteristics with considerable emissions reduction.

关键词： Biodiesel Carbon nanotubes(CNTs) Engine performance Exergy Combustion characteristics Emissions

PERIODIC mOTIONS OF SPINNING RIGID SPACECRAFT UNDER INFLUENCE OF GRAVITATIONal AND mAGNETIC FIELDS

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Applied mathematics and mechanics(English Edition) 2006年第8期27卷 1061-1069页

作者： Yehia A.abdel-aziz m.H.Yehia F.A.Abd El-Salam m.Radwan National Research Institute of Astronomy and Geophysics Helwan. Cairo Egypt mathematics Department Faculty of Science Mansoura University MansouraEgypt Astronomy Department Faculty of ScienceCairo UniversityCairo12613Egypt

The motion of a magnetized axisymmetric spacecraft about its center of mass in a circular orbit is considered, taking the gravitational and magnetic effects of the central body into account. Equations of motion of the reduced system are transformed to equations of plane motion of a charged particle under the action of electric and magnetic fields. Stationary motions of the system are determined and periodic motions near to them are constructed using the Lyapounoff theorem of the holomorphic integral.

关键词： periodic motions routhian rigid spacecraft

Types of trematodes infecting freshwater snails found in irrigation canals in the East Nile locality,Khartoum,Sudan

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Infectious Diseases of Poverty 2016年第1期5卷 139-148页

作者： Nidal A.I.mohammed Henry madsen abdel aziz A.R.m.Ahmed Department of Zoology Khartoum College of Medical SciencesKhartoumSudan Parasitology and Aquatic Diseases Department of Veterinary Disease BiologyFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksbergDenmark Education Expert Company RiyadhKingdom of Saudi Arabia

Background:The planorbid freshwater snails of the two genera,Biomphalaria and Bulinus-have been vigorously studied due to the role they play as intermediate hosts of *** Sudan specifically,most studies have focused on the chemical and ecological control of the two genera,but few studies have looked at their biological *** study explored the coexistence of other species of freshwater snails and the two genera along with their trematode infections in relation to a number of environmental factors in the East Nile locality,Khartoum state,***:Freshwater snails from irrigation canals(abueshreens)were sampled monthly from January 2004 to December *** snails were examined for trematode infections by cercarial emergence immediately after collection and then weekly for an additional four weeks to allow for the maturation of prepatent *** cover in the study sites as well as the physicochemical characteristics of the water,including temperature,were also ***:A total of 10,493 snails,representing seven species,were *** most abundant species was Biomphalaria pfeifferi,representing 48.6%of the ***,14.1%of the snails were found to be shedding some type of *** species were found to have infections;among these the Bulinus truncatus species was found to be the most heavily infected,with an overall prevalence of 46.2%.Double infections were recorded in only two *** snails and one Cleopatra bulimoides *** different morphotypes of cercariae were recorded,seven of which appeared not to conform to previously described cercariae from *** type 1 was the most common type of cercariae recovered,accounting for 44.3% of all *** density of snails tended to be lower during the summer months than the winter months,except for *** snails,which were not affected by seasonal ***:The findings of this study indicate that besides sc

关键词： Freshwater snails Trematode cercariae Biomphalaria Bulinus East Nile locality Khartoum Sudan