|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Numerical Investigation of Rotating Stall in Centrifugal Compressor with Vaned and Vaneless Diffuser显示文摘This study presents a numerical simulation of the stall and surge in a centrifugal compressor and presents a description of the stall development in two different cases.The first case is for a compressor with vaneless diffuser and the second is for a compressor with vaned diffuser of the vane island shape.The main aim of this study is to compare the flow characteristics and behavior for the two compressors near the surge operating condition and provide further understanding of the diffuser role when back flow occurs at surge.Results showed that for a location near the diffuser entrance,the amplitude of the static pressure fluctuations for the vaneless diffuser case is higher than that for the vaned diffuser case near surge condition.These pressure fluctuations in the case of the vaneless diffuser appear with a gradual decrease of the mean pressure value as a part of the surge cycle.While for the case of the vaned diffuser,the pressure drop during surge occurs faster than the case of the vaneless diffuser.Also,results indicated that during surge in the case of vaneless diffuser,there is a region with low velocity and back flow that appears as a layer connecting all impeller passages near shroud surface and this layer develops in size with time.On the other hand,for the case of vaned diffuser during surge,the low velocity regions appear in random locations in some passages and these regions expand with time towards the shroud surface.Results showed that during stall,the impeller passages are exposed to identical impact from stall cells in the case of vaneless diffuser while the stall effect varies from passage to another in the case of the vaned diffuser. | Taher Halawa Mohamed Alqaradawi Mohamed S.Gadala Ibrahim Shahin Osama Badr | 2015 | Journal of Thermal Science2015，24，4： | 6 |
| 2 | Ureteroscopic management of lower ureteric calculi: a 15‐year single‐centre experience显示文摘 | Osama M.Elashry Abdelnaser K.Elgamasy Magdy A.Sabaa MohamedAbo‐Elenien Mohamed AdelOmar Hassan H.Eltatawy Shawky A.El‐Abd | 2008 | BJU International2008，，8： | 5 |
| 3 | 甘草内生细菌对4种植物病原菌的抑菌谱及其16SrRNA系统发育分析显示文摘旨在筛选对4种植物病原真菌具有拮抗活性的甘草内生细菌,为新疆甘草内生细菌的开发应用提供理论依据。采用平板对峙培养法从100株甘草内生细菌中筛选对石榴枯萎病甘薯长喙壳、草果叶斑病镰刀菌、草果假茎黑斑病小孢拟盘多毛孢、墨兰炭疽病胶孢炭疽菌等4个病原菌具有拮抗活性的菌株,并测定其16SrRNA基因序列,建立系统发育树对其进行初步鉴定。结果显示,61株菌株对甘薯长喙壳具有拮抗作用,其中13株菌的抑菌半径均大于15mm。进一步研究表明,10株菌对4种植物病原菌都表现出较高的抑菌能力。基于16Sr RNA基因序列分析与系统发育分析表明,其中11株菌为萎缩芽孢杆菌(Bacillus atrophaeus),另外2株菌分别为副氧化微杆菌(Microbacterium paraoxydans)和莫哈韦芽胞杆菌(B.mojavensis)。 | 祖丽皮亚木·木沙尔 李丽 郭建伟 古丽斯玛依·艾拜都拉 OSAMA Mohamed | 2018 | 西北农业学报2018，27，9： | 4 |
| 4 | Clinical outcomes of transepithelial photorefractive keratectomy versus femtosecond laser assisted keratomileusis for correction of high myopia in South Egyptian population显示文摘AIM: To evaluate the safety and efficacy of transepithelial photorefractive keratectomy(t-PRK) with adjuvant mitomycin C(MMC) versus femtosecond laser assisted keratomileusis(Femto-LASIK) in correction of high myopia.METHODS: Prospective randomized comparative study including 156 eyes of 156 patients with high myopia and a spherical equivalent refraction(SER) <-6.00 D. They were divided randomly into two groups: Group A included 72 eyes treated with t-PRK with adjuvant MMC and Group B included 84 eyes treated with Femto-LASIK. Visual acuity, SER, corneal topography, pachymetry and keratometry were assessed for 12 mo postoperatively.RESULTS: The preoperative mean SER was-8.86±1.81 and-9.25±1.70 D in t-PRK MMC group and Femto-LASIK respectively(P=0.99) which improved to-0.65±0.43 D and-0.69±0.50 D at 12 mo follow up. Mean SER remained stable during the 12 mo of follow-up, with no statistically significant difference between the two groups(P=0.64). In t-PRK MMC group, only six eyes needed retreatment after six months of follow up. And two eyes showed haze(one reversible haze grade 2, while the other had dense irreversible haze grade 4).CONCLUSION: t-PRK MMC provides safe and satisfactory visual outcomes and acceptable risk as Femto-LASIK in patients with high myopia. | Amr Mounir Engy Mohamed Mostafa Hatem Ammar Osama Ali Mohammed Alahmady Hamad Alsmman Mahmoud Mohamed Farouk Mohamed Gamal Elghobaier | 2020 | International Journal of Ophthalmology(English edition)2020，13，1： | 4 |
| 5 | Gut microbiota in various childhood disorders:Implication and indications显示文摘Gut microbiota has a significant role in gut development,maturation,and immune system differentiation.It exerts considerable effects on the child's physical and mental development.The gut microbiota composition and structure depend on many host and microbial factors.The host factors include age,genetic pool,general health,dietary factors,medication use,the intestine's pH,peristalsis,and transit time,mucus secretions,mucous immunoglobulin,and tissue oxidation-reduction potentials.The microbial factors include nutrient availability,bacterial cooperation or antagonism,and bacterial adhesion.Each part of the gut has its microbiota due to its specific characteristics.The gut microbiota interacts with different body parts,affecting the pathogenesis of many local and systemic diseases.Dysbiosis is a common finding in many childhood disorders such as autism,failure to thrive,nutritional disorders,coeliac disease,Necrotizing Enterocolitis,helicobacter pylori infection,functional gastrointestinal disorders of childhood,inflammatory bowel diseases,and many other gastrointestinal disorders.Dysbiosis is also observed in allergic conditions like atopic dermatitis,allergic rhinitis,and asthma.Dysbiosis can also impact the development and the progression of immune disorders and cardiac disorders,including heart failure.Probiotic supplements could provide some help in managing these disorders.However,we are still in need of more studies.In this narrative review,we will shed some light on the role of microbiota in the development and management of common childhood disorders. | Nermin Kamal Saeed Mohammed Al-Beltagi Adel Salah Bediwy Yasser El-Sawaf Osama Toema | 2022 | World Journal of Gastroenterology2022，28，18： | 3 |
| 6 | A secure image steganography algorithm based on least significant bit and integer wavelet transform显示文摘The rapid development of data communication in modern era demands secure exchange of information. Steganography is an established method for hiding secret data from an unauthorized access into a cover object in such a way that it is invisible to human eyes. The cover object can be image, text, audio,or video. This paper proposes a secure steganography algorithm that hides a bitstream of the secret text into the least significant bits(LSBs) of the approximation coefficients of the integer wavelet transform(IWT) of grayscale images as well as each component of color images to form stego-images. The embedding and extracting phases of the proposed steganography algorithms are performed using the MATLAB software. Invisibility, payload capacity, and security in terms of peak signal to noise ratio(PSNR) and robustness are the key challenges to steganography. The statistical distortion between the cover images and the stego-images is measured by using the mean square error(MSE) and the PSNR, while the degree of closeness between them is evaluated using the normalized cross correlation(NCC). The experimental results show that, the proposed algorithms can hide the secret text with a large payload capacity with a high level of security and a higher invisibility. Furthermore, the proposed technique is computationally efficient and better results for both PSNR and NCC are achieved compared with the previous algorithms. | ELSHAZLY Emad ABDELWAHAB Safey ABOUZAID Refaat ZAHRAN Osama ELARABY Sayed ELKORDY Mohamed | 2018 | Journal of Systems Engineering and Electronics2018，29，3： | 2 |
| 7 | Cardiac changes in infants of diabetic mothers显示文摘Diabetes mellitus(DM)is a systemic chronic metabolic disorder characterized by increased insulin resistance and/orβ-cell defects.It affects all ages from the foetal life,neonates,childhood to late adulthood.Gestational diabetes is a critical risk factor for congenital heart diseases(CHDs).Moreover,the risk increases with low maternal education,high body mass index at conception,undiagnosed pregestational diabetes,inadequate antenatal care,improper diabetes control,and maternal smoking during pregnancy.Maternal DM significantly affects the foetal heart and foetal-placental circulation in both structure and function.Cardiac defects,myocardial hypertrophy are three times more prevalent in infants of diabetic mothers(IDMs).Antenatal evaluation of the cardiac function and structures can be performed with foetal electrocardiography and echocardiography.Postnatal cardiac evaluation can be performed with natal and postnatal electrocardiography and echocardiography,detection of early atherosclerotic changes by measuring aortic intima-media thickness,and retinal vascular changes by retinal photography.Ameliorating the effects of diabetes during pregnancy on the offspring depends mainly on pregestational and gestational diabetes prevention.However,other measures to reduce the risk,such as using medications,nutritional supplements,or probiotics,still need more research.This review discusses the mechanism of foetal sequels and the risk factors that increase the prevalence of CHDs in gestational DM,the various cardiac outcomes of gestational DM on the foetus and offspring,cardiac evaluation of foetuses and IDMs,and how to alleviate the consequences of gestational DM on the offspring. | Mohammed Al-Biltagi Osama El razaky Doaa El Amrousy | 2021 | World Journal of Diabetes2021，12，8： | 2 |
| 8 | Coxiella burnetii,the causative agent of Q fever in Saudi Arabia:molecular detection from camel and other domestic livestock显示文摘Objective:To detect Coxiella burnetii(C.burnetii)DNA in clinical specimens from camel,goats,cattle and sheep in the Kingdom of Saudi Arabia.Methods:A total of 367 clinical samples including blood,milk,faeces and urine were collected from different livestock and subjected to PCR amplification using primers which amplify transposon-like region and transposase gene.Results:Positive amplification from both regions was obtained from camel,goats and cattle but not from sheep.A percentage of 10.8%samples yielded positive PCR amplification from both blood and milk,where 15 of 139 blood and 16 of 148 milk samples were positive.Faeces and urine showed higher percentages of positive samples reaching 40.8%and 23.8%respectively.Conclusions:The preferred route of shedding in camel appeared to be the faeces followed by urine,while that of goats appeared to be the faeces and that of the cattle appeared to be the milk. | Osama B.Mohammed Abdulrahman A.Jarelnabi Riyadh S.Aljumaah Mohammed A.Alshaikh Amel O.Bakhiet Sawsan A.Omer Abdulaziz N.Alagaili Mansour F.Hussein | 2014 | Asian Pacific Journal of Tropical Medicine2014，7，9： | 2 |
| 9 | Compressive strength and stability of sustainable self-consolidating concrete containing fly ash, silica fume, and GGBS显示文摘 | Osama Ahmed MOHAMED Omar Fawwaz NAJM | 2017 | Frontiers of Earth Science2017，11，4： | 2 |
| 10 | Inter-ethnic marriages and severity of coronary artery disease:A multicenter study of Arabian Gulf States显示文摘AIM To assess the association of inter-ethnic vs intra-ethnic marriage with severity of coronary artery disease(CAD) in men undergoing angiography.METHODS We conducted a prospective multicenter,multi-ethnic,cross sectional observational study at five hospitals in Saudi Arabia and the United Arab Emirates,in which we used logistic regression analysis with and without adjustment for baseline differences. RESULTS Data were collected for 1068 enrolled patients undergoing coronary angiography for clinical indications during the period of April 1^(st),2013 to March 30^(th),2014. Ethnicities of spouses were available only for male patients. Of those enrolled,687 were married men and constituted the cohort for the present analysis. Intra-ethnic marriages were reported in 70% and inter-ethnic marriages in 30%. After adjusting for baseline differences,interethnic marriage was associated with lower odds of having significant CAD [adjusted odds ratio 0.52(95%CI:0.33,0.81)] or multi-vessel disease(MVD) [adjusted odds ratio 0.57(95%CI:0.37,0.86)]. The adjusted association with left main disease showed a similar trend,but was not statistically significant [adjusted odds ratio 0.74(95%CI:0.41,1.32)]. The association between interethnic marriage and the presence of significant CAD and MVD was not modified by number of concurrent wives(P interaction > 0.05 for both).CONCLUSION Among married men undergoing coronary angiography,inter-ethnic,as compared to intra-ethnic,marriage is associated with lower odds of significant CAD and MVD. | Amin Daoulah Salem Al-kaabi Amir Lotfi Mushabab Al-Murayeh S Ali Nasseri Waleed Ahmed Salah N Al-Otaibi Mohamed N Alama Osama E Elkhateeb Amy J Plotkin Majed M Malak Khalid Alshali Mohamed Hamzi Saleh Al Khunein Mohammed Abufayyah Alawi A Alsheikh-Ali | 2017 | World Journal of Cardiology2017，9，4： | 2 |
| 11 | Outcome of the Rhomboid Flap for Recurrent Pilonidal Disease显示文摘 | Osama el-Khadrawy Mohamed Hashish Khaled Ismail Helmy Shalaby | 2009 | World Journal of Surgery2009，，5： | 1 |
| 12 | Sandwich grafting technique for endoscopic endonasal repair of cerebrospinal fluid rhinorrhoea显示文摘 | Magdy Eisa Saafan Osama A. Albirmawy Mohamed Osama Tomoum | 2014 | European Archives of Oto-Rhino-Laryngology2014，，5： | 1 |
| 13 | Hepatie dys- function in kidney transplant recipients: prevalence and impact on graft and patient survival显示文摘 | Osama AG Mohamed AS Ahmed AH | 2007 | Clinical and Experimental Nephrology2007，11，4： | 1 |
| 14 | Role of combined use of potassium citrate and tamsulosin in the management of uric acid distal ureteral calculi显示文摘 | Osama El-Gamal Mohamed El-Bendary Maged Ragab Mohamed Rasheed | 2012 | Urological Research2012，，3： | 1 |
| 15 | Clinical efficacy of direct-acting antiviral therapy for recurrent hepatitis C virus infection after liver transplantation in patients with hepatocellular carcinoma显示文摘BACKGROUND Recurrent hepatitis C virus(HCV)infection of transplanted liver allografts is universal in patients with detectable HCV viremia at the time of transplantation.Direct-acting antiviral(DAA)therapy has been adopted as the standard of care for recurrent HCV infection in the post-transplant setting.However,there are insufficient data regarding its efficacy in liver transplant(LT)recipients with a history of hepatocellular carcinoma(HCC),and the risk of HCC recurrence after DAA therapy is unknown.predictors of DAA treatment failure and HCC recurrence in LT recipients.METHODS A total of 106 LT recipients given DAAs for recurrent HCV infection from 2015 to 2019 were identified(68 with and 38 without HCC).Descriptive statistics and logistic regression models were used to estimate the multivariate odds ratios and respective 95%confidence intervals for predictors of treatment failure and HCC recurrence.RESULTS Six patients(6%)experienced DAA therapy failure post-LT and 100(94%)had a sustained virologic response at follow-up week 12.A high alanine transaminase level>35 U/L at treatment week 4 was a significant predictor of treatment failure.Relapse to pre-LT DAA therapy is a predictor of post-LT HCC recurrence,P=0.04.DAA relapse post-LT was also associated with post-transplantation HCC recurrence,P=0.05.CONCLUSION DAAs are effective and safe in the treatment of recurrent HCV infection in LT recipients with history of HCC.Relapse to pre-and post-LT DAA therapy is associated with post-transplantation HCC recurrence. | Mohamed Saleh Ismail Manal Hassan Saira Aijaz Khaderi Wael Ahmed Yousry Maha Mohsen Kamal El-Din Mohamed Mohamed Bahaa El-Din Osama Aboelfotoh El Sayed Ahmed Omar Kaseb John Alan Goss FasihaKanwal Prasun Kumar Jalal | 2020 | World Journal of Hepatology2020，12，9： | 1 |
| 16 | Factors Affecting Resistance of Concrete to Freeing and Thawing Damage显示文摘 | Osama A Mohamed | 2000 | Journal of Materials in Civil Engineering2000，12，1： | 1 |
| 17 | Hepatic dysfunction in kidney transplant recipients: prevalence and impact on graft and pa- tient survival 显示文摘 | Osama AG Mohamed AS Ahmed AH | 2007 | Clinical and Experimental Nephrology2007，11，4： | 1 |
| 18 | Automatic Analysis Reporting for Hydro-Chemical Data Using Updated DurovPwin Program显示文摘 | Abdelaziz Mohammed A1-Bassam Ahmad Rabie Khalil Osama Mohammed Kaoud Kassem | 2013 | Journal of Agricultural Science and Technology(B)2013，3，10： | 1 |
| 19 | Combined modality treatment with bladder preservation for muscle invasive bladder cancer显示文摘 | Magdy A. Sabaa Osama M. El-Gamal Mohamed Abo-Elenen Amr Khanam | 2010 | Urologic Oncology: Seminars and Original Investigations2010，，： | 1 |
| 20 | Ferrara ring segments implantation for treating keratoconus显示文摘AIM: To investigate the efficacy of Ferrara rings (FR) implantation in the treatment of keratoconus.METHODS: It was a retrospective case series descriptive study. The sample was comprised of 50 patients 79 eyes diagnosed with progressive keratoconus. This included 24 (48%) males and 26 (52%) females between the age of 13 and 44 years. All participants underwent surgical implantation of FR in the period between January 2009 and September 2010 at Jordan University Hospital. Thorough ophthalmologic examinations were applied to measure vital variables for each pathological condition before and after surgery. RESULTS: Findings indicated an overall significant postoperative improvement in both uncorrected visual acuity (UCVA) and best spectacle corrected visual acuity (BSCVA) throughout follow up visits. Moreover, results illustrated a significant decrease in spherical equivalent (SE) and keratometric readings (lower, higher and the average). CONCLUSION: Surgical intervention strategies are being frequently developed to meet the needs of patients with keratoconus. The implantation of Ferrara rings has proven to be a safe and feasible alternative procedure for the treatment of mild-moderate keratoconus especially for patients with contact lenses intolerance. We have found that this procedure has improved visual outcomes in all eyes studied. Nevertheless, further research is needed to investigate long term outcomes. | Mohammed Ali Abu Ameerh Ghada Ismail Hamad Osama H. Ababneh Almutez M. Gharaibeh Rola M. Al Refai Muawyah D. Al Bdour | 2012 | International Journal of Ophthalmology(English edition)2012，5，5： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员