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24篇 您的检索式:作者名="Mohammad Fathy"
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1Turbine blade temperature calculation and life estimation-a sensitivity analysis显示文摘The overall operating cost of the modern gas turbines is greatly influenced by thedurability of hot section components operating at high temperatures.In turbine operatingconditions,some defects may occur which can decrease hot section life.In the present paper,methods used for calculating blade temperature and life are demonstrated and validated.Usingthese methods,a set of sensitivity analyses on the parameters affecting temperature and life ofa high pressure,high temperature turbine first stage blade is carried out.Investigateduncertainties are:(1)blade coating thickness,(2)coolant inlet pressure and temperature(asa result of secondary air system),and(3)gas turbine load variation.Results show thatincreasing thermal bamier coating thickness by 3 times,leads to rise in the blade life by 9times.In addition,considering inlet cooling temperature and pressure,deviation in temperaturehas greater effect on blade life.One of the interesting points that can be realized from theresults is that 300 hours operation at 70%load can be equal to one hour operation atbase load.Majid Rezazadeh Reyhani Mohammad Alizadeh Alireza Fathi Hiwa Khaledid 2013Propulsion and Power Research2013,2,2:9
2基于瞬时产量递减分析确定天然裂缝性油藏平均地层压力显示文摘以Warren和Root等提出的裂缝-孔隙双重介质模型为基础,拓展延伸了Mavor、Cinco-Ley和Daprat等的裂缝系统拟稳态-定产量生产的解及基质系统拟稳态-定压力生产的解,提出了根据天然裂缝性油藏定压开采的瞬时产量递减准确估算油藏平均压力的新方法。具体方法为:分别将基质产量方程和裂缝产量方程两端取自然对数,得到两条直线;再利用其斜率和截距确定弹性储容比、油藏总储容以及泄油面积,最后确定平均地层压力。经算例和实例验证,新方法简单实用,与物质平衡法和Tiab直接合成技术法得到的估算结果十分接近。Daryasafar Amin Amareh Iman Fathi Nasab Mohammad Kharrat Riyaz Jalilian Milad 2015石油勘探与开发2015,42,2:5
3Effect of Surface Treatment and Metallic Coating on Corrosion Behavior and Biocompatibility of Surgical 316L Stainless Steel Implant显示文摘Surface engineering technology is a suitable method for coatings on the metal surfaces or performing surface modification treatment,which can improve corrosion resistance and biocompatibility of metals.In this research,corrosion behavior of Nb coating on H 2 SO 4 and HNO 3 treated AISI stainless steel 316L (SS) was evaluated.Nb coating was carried out using physical vapor deposition process on the SS.Characterization techniques including scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) technique were used to investigate the microstructure and morphology of the coated and treated SS.Electrochemical potentiodynamic tests were performed in two types of physiological solutions and compared with the pristine SS specimens.Cyclic polarization tests were performed to evaluate resistivity against pitting.Experimental results indicate that Nb coating and surface treatment of the SS had a positive effect on improvement of corrosion behavior.The decrease in corrosion current densities was significant for coated and treated specimens.The corrosion current density was much lower than the values obtained for pristine specimens.Ali Parsapour Saied Nouri Khorasani Mohammad Hossein Fathi 2012Journal of Materials Science & Technology2012,28,2:2
4Literature review of the outcome of and methods used to improve transperineal repair of rectocele显示文摘BACKGROUND Rectocele is commonly seen in parous women and sometimes associated with symptoms of obstructed defecation syndrome(ODS).AIM To assess the current literature in regard to the outcome of the classical transperineal repair(TPR)of rectocele and its technical modifications.METHODS An organized literature search for studies that assessed the outcome of TPR of rectocele was performed.PubMed/Medline and Google Scholar were queried in the period of January 1991 through December 2020.The main outcome measures were improvement in ODS symptoms,improvement in sexual functions and continence,changes in manometric parameters,and quality of life.RESULTS After screening of 306 studies,24 articles were found eligible for inclusion to the review.Nine studies(301 patients)assessed the classical TPR of rectocele.The median rate of postoperative improvement in ODS symptoms was 72.7%(range,45.8%-83.3%)and reduction in rectocele size ranged from 41.4%-95.0%.Modifications of the classical repair entailed omission of levatorplasty,addition of implant,concomitant lateral internal sphincterotomy,changing the direction of plication of rectovaginal septum,and site-specific repair.CONCLUSION The transperineal repair of rectocele is associated with satisfactory,yet variable,improvement in ODS symptoms with parallel increase in quality-of-life score.Several modifications of the classical TPR were described.These modifications include omission of levatorplasty,insertion of implants,performing lateral sphincterotomy,changing the direction of classical plication,and site-specific repair.The indications for these modifications are not yet fully clear and need further prospective studies to help tailor the technique to rectocele patients.Mohammad Fathy Ahmed Hossam Elfallal Sameh Hany Emile 2021World Journal of Gastrointestinal Surgery2021,13,9:2
5Energy Harvesting From Sea Waves With Consideration of Airy and JONSWAP Theory and Optimization of Energy Harvester Parameters显示文摘为在海驱动低力量的电子设备的新方法之一是收获系统的一个波浪精力。在这个方法,压电的材料被采用把海波浪的机械精力变换成电能。这个方法的优点基于避免控告系统的一节电池。研究在然而,就与随机的 JONSWAP 波浪理论收获的精力而言从海波浪收获的精力上被做了,然后决定收获的精力的最佳价值是新的。这份报纸由实现 JONSWAP 波浪模型做那,计算生产力量,并且写实地证明产量力量与更简单的空气的波浪模型比较被减少。另外,精力 harvester 系统的参数用一个模仿的退火的算法被优化,产出增加的生产力量。Hadi Mirab Reza Fathi Vahid Jahangiri Mir Mohammad Ettefagh Reza Hassannejad 2015Journal of Marine Science and Application2015,14,4:2
6Remifentanil Added to Propofol for Induction of Anesthesia Can Reduce Reorientation Time After Electroconvulsive Therapy in Patients With Severe Mania显示文摘Farzin Rezaei Karim Nasseri Gholam Reza Esfandiari Sayed Mohammad Hossein Sadeghi Mohammad Fathie Fardin Gharibi 2012The Journal of Electroconvulsive Therapy2012,,2:1
71H NMR based metabolic profiling in Crohn’s disease by random forest methodology显示文摘Fariba Fathi Laleh Majari‐Kasmaee Ahmad Mani‐Varnosfaderani Anahita Kyani Mohammad Rostami‐Nejad Kaveh Sohrabzadeh Nosratollah Naderi Mohammad Reza Zali Mostafa Rezaei‐Tavirani Mohsen Tafazzoli Afsaneh Arefi‐Oskouie 2014Magn. Reson. Chem2014,,:1
8NEUROCOGNITIVE, MENTAL HEALTH, AND GLUCOSE DISORDERS IN FARMERS EXPOSED TO ORGANOPHOSPHORUS PESTICIDES显示文摘Malekirad Ali Akbar Faghih Mahya Mirabdollahi Mansuoreh Kiani Mahdi Fathi Arezoo Abdollahi Mohammad 2013Arhiv Za Higijenu Rada i Toksikologiju2013,,1:1
9Internationalization of higher education systems 显示文摘Fatemeh Behjati Ardakani Mohammad Hossein Yarmohammadian Ahmad Ali Foroughi Abari Koroush Fathi 2011Procedia-Social and Behavioral Sciences2011,,5:1
10Trends and occurrences of nitrate in the groundwater of the West Bank, Palestine显示文摘Fathi M Anayah Mohammad N Almasri 2009Applied Geography2009,29,:1
11Clad height control in laser solid freeform fabrication using a feedforward PID controller显示文摘Alireza Fathi Amir Khajepour Ehsan Toyserkani Mohammad Durali 2007The International Journal of Advanced Manufacturing Technology (-)2007,,3:1
12In- relation of graph theory and matrix approach with fuzzy AHP for equipment selection显示文摘Hossein Safari Alireza Faghih Mohammad Reza Fathi 2013Journal of Industrial Engineer- ing and Management2013,6,2:1
13Long-term respiratory disorders of claimers with subclinical exposure to chemical warfare agents显示文摘Ghanei M Fathi H Mohammad MM 0,,08:1
14VIBRATION ANALYSIS OF A BEAM WITH EMBEDDED SHAPE MEMORY ALLOY WIRES显示文摘In this study,analytical relations for evaluating the exact solution of natural frequency and mode shape of beams with embedded shape memory alloy(SMA)wires are presented.Beams are modeled according to Euler-Bernoulli,Timoshenko and third order beam(Reddy)theories.A relation is obtained for determining the efect of axial load generated by the recovery action of pre-strained SMA wires.By defining some dimensionless quantities,the efect of diferent mechanical properties on the frequencies and mode shapes of the system are carefully examined.The efect of axial load generated by SMA wires with buckling load and frequency jump is accurately studied.Mohammad Mehdi Barzegari Morteza Dardel Alireza Fathi 2013Acta Mechanica Solida Sinica2013,26,5:1
15Assess- ment of hepatic and pancreatic iron overload in pediatric Beta- thalassemic major patients by T2 * weighted gradient echo magnetic resonance imaging显示文摘Youssef DM Fawzy Mohammad F Ahmed Fathy A et at 2013ISRN Hematol2013,2013,49:1
16Spatial analysis of groundwater quality for drinking purpose in Sirjan Plain,Iran by fuzzy logic in GIS显示文摘At present,due to shortage of water resources,especially in arid and semiarid areas of the world such as Iran,exploitation of groundwater resources with suitable quality for drinking is of high importance.In this regard,contamination of groundwater resources to heavy metals,especially arsenic,is one of the most important hazards that threaten human health.The present study aims to develop an approach for presenting the groundwater quality of Sirjan city in Kerman Province,based on modern tools of spatial zoning in the GIS environment and a fuzzy approach of evaluating drinking water in accordance with the standards of world health organization(WHO).For this purpose,qualitative data related to 22 exploitation wells recorded during 2002 to 2017 were used.In addition,fuzzy aggregate maps were prepared in two scenarios by neglecting and considering arsenic presence in groundwater resources.The results showed a decrease in groundwater quality over time.More specifically,neglecting the presence of arsenic,in 2002,all drinking wells in the area were located in an excellent zone,while in 2017 a number of operation wells were located in the good and medium zone.Also,the final map,considering the presence of arsenic as a limiting factor of drinking water,indicated that parts of the southern regions of the plain would be the best place to dig wells for drinking water.Therefore,the use of new methods can contribute significantly to the usage of groundwater aquifers and provide a good view of the aquifer water quality.Negar Fathi Mohammad Bagher Rahnama Mohammad Zounemat Kermani 2020Journal of Groundwater Science and Engineering2020,8,1:1
17Prepara-tion of agar nanospheres: Comparison of response surface and artificial neural network modeling by a genetic algorithm approach显示文摘Mohammad Reza Zaki Jaleh Varshosaz and Milad Fathi 2015Carbohydrate Polymers2015,122,:1
18Barriers for resuming endoscopy service in the context of COVID-19 pandemic:A multicenter survey from Egypt显示文摘BACKGROUND The current coronavirus disease 2019(COVID-19)pandemic has affected routine endoscopy service across the gastroenterology community.This led to the suspension of service provision for elective cases.AIM To assess the potential barriers for resuming the endoscopy service in Egypt.METHODS A national online survey,four domains,was disseminated over a period of 4 wk in August 2020.The primary outcome of the survey was to determine the impact of the COVID-19 pandemic on the endoscopy service and barriers to the full resumption of a disabled center(s).RESULTS A hundred and thirteen Egyptian endoscopy centers participated in the survey.The waiting list was increased by≥50% in 44.9% of areas with clusters of COVID-19 cases(n=49)and in 35.5% of areas with sporadic cases(n=62).Thirty nine(34.8%)centers suffered from staff shortage,which was considered a barrier against service resumption by 86.4% of centers in per-protocol analysis.In multivariate analysis,the burden of cases in the unit locality,staff shortage/recovery and the availability of separate designated rooms for COVID-19 cases could markedly affect the resumption of endoscopy practice(P=0.029,<0.001 and 0.02,respectively)and Odd’s ratio(0.15,1.8 and 0.16,respectively).CONCLUSION The COVID-19 pandemic has led to restrictions in endoscopic volumes.The staff shortage/recovery and the availability of COVID-19 designed rooms are the most important barriers against recovery.Increasing working hours and dividing endoscopy staff into teams may help to overcome the current situation.Omar Elshaarawy Sameh Aldesoky Lashen Nahed A Makhlouf Doaa Abdeltawab Mariam Salah Zaghloul Rasha M Ahmed Hayam Fathy Shimaa Afifi Muhammad Abdel-Gawad Eman Abdelsameea Sherief Abd-Elsalam Salem Youssef Mohamed Mohammed Tag-Adeen Mina Tharwat Ahmed Alzamzamy Ahmed Nasr Bekhit Alshaimaa M Eid Abeer Awad Mohamed-Naguib Wifi Mohammad Aamr Waleed A Abd El Dayem Mohamed Alboraie 2020World Journal of Gastroenterology2020,26,43:0
19Fast-dissolving antioxidant nanofibers based on Spirulina protein concentrate and gelatin developed using needleless electrospinning显示文摘Spirulina is a microalga that is well-known for its high protein content and biological activities directly related to its antioxidant capacity.The objective of this study was to produce fast-dissolving antioxidant nanofibers based on Spirulina protein concentrate (SPC) and gelatin using needleless electrospinning technique.The effect of mixing ratios of SPC (10% w/w) and gelatin (20% w/w) on the viscosity,electrical conductivity and surface tension of electrospinning solutions as well as diameter and morphology of resulting nanofibers was investigated.Increasing the SPC level in the solution blends resulted in a decrease in apparent viscosity and electrical conductivity and an almost stable trend in surface tension (29.25–32.19 mN/m) that led to diminish of diameter of the nanofibers.Scanning electron microscopy images showed that SPC/gelatin ratio of 40:60 led to the production of uniform and bead-free nanofibers with a relatively smaller average diameter (208.7 ± 46.5 nm).Atomic force microscopy images indicated mesh-like,fibrillary,and bead-free structures.Fourier transform infrared spectroscopy verified the formation of composite nanofibers and intermolecular interactions between both proteins.X-ray diffraction and thermal analysis showed higher amorphous structure and stability of produced SPC/gelatin nanofibers in comparison to pure materials which was favorable for formation of stable fast-dissolving fibers.Results of DPPH and ABTS radical scavenging activities showed that the antioxidant activity of composite nanofibers significantly improved with increasing SPC mixing ratio (p < 0.05).The dissolution test demonstrated that SPC/gelatin nanofibers can be rapidly dissolved in aqueous medium within 2 s.Finally,the results indicated that the electrospun SPC/gelatin nanofibers could be potentially used for nutraceutical delivery in food and packaging applications under high humidity.Vahid Mosayebi Milad Fathi Mohammad Shahedi Nafiseh Soltanizadeh Zahra Emam-Djomeh 2022Food Bioscience2022,47,3:0
20A Fuzzy Logic Based Sensor Relocation Betterment for Mobile Wireless Sensor Networks显示文摘Ehsan Khazaei Mahmood Fathi Mohammad Mehrani 2012通讯和计算机(中英文版)2012,9,3:0
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