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Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants

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Friction 2020年第5期8卷 905-916页

作者： Mohamed kamal Ahmed ali Xianjun HOU Mohamed AAABDELKAREEM Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were com-prehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%–30% and 26.5%–32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

关键词： engine tribology nanomaterial nanolubricant friction wear tribofilm

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Clinical profile,etiology,management and outcome of empyema thoracis associated with COVID-19 infection:A systematic review of published case reports

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Asian Pacific Journal of Tropical Medicine 2023年第8期16卷 337-346页

作者： Yasser ali kamal Seham Abdelwakeel Abdel-Gaber Department of Cardiothoracic Surgery Faculty of MedicineMinia UniversityEl-MinyaEgypt Department of Medical Pharmacology Faculty of MedicineMinia UniversityEl-MinyaEgypt

Objective:To explore the clinical features,diagnosis,etiology,treatment,and outcomes of COVID-19 related ***:Using PRISMA statement,a systematic search of relevant case reports published between December 2019 and April 2023 was performed through seven *** collected data included demographics,clinical manifestations,diagnostic findings,treatment,and ***:Thirty-six case reports were identified with 43 cases of *** included cases had a median age of 55 years(range:12-78 years)and 79.1%(34/43)were *** majority of cases presented during hospitalization for management of acute COVID-19 infection(29/43,67.4%)and Charlson comorbidity indexality rate was 23.3%(10/43).Sepsis and/or multi-organ failure were the most commonly reported causes of *** univariate analysis,no statistically significant risk factor for mortality was ***:COVID-19-associated empyema has a variety of predisposing factors,time of presentation,clinical features,and causative *** or minimally invasive surgical procedures are performed more frequently than isolated chest *** in COVID-19 patients worsens their prognosis and can lead to serious complications.

关键词： COVID-19 SARS-CoV-2 Empyema Microbiology Thoracic surgery

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A Novel Anthracene-based Chemosensor for Cu2+ Ion

A Novel Anthracene-based Chemosensor for Cu2+ Ion

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大环化学和超分子化学的新发展——当前学科交叉的一个重要桥梁——中国化学会全国第十五届大环化学暨第七届超分子化学学术讨论会

作者： HAROON ali kamal Attia National Organization for Drug Control and Research(NODCAR)

Metal ions have been playing important roles in various biological processes and human ***, metal ions detection has attracted considerable attention by chemical and biological researchers. Anthracence,as a highly fluorescent fluorophore,has been extensively potential applications for sensing pH,metal ions,simple inorganic anions,small organic molecules,as well as for cell-surface labeling and

关键词： copper(Ⅱ) ion chemosensor anthracene bis-triazole

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Synthesis of Novel Benzimidazoliums and Their Orbifloxacin Supramolecular Drugs

Synthesis of Novel Benzimidazoliums and Their Orbifloxacin S...

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大环化学和超分子化学的新发展——当前学科交叉的一个重要桥梁——中国化学会全国第十五届大环化学暨第七届超分子化学学术讨论会

作者： HAROON ali kamal Attia National Organization for Drug Control and Research(NODCAR)

Novel benzimidazoliums were successfully synthesized via multi-step reactions starting from commercially available diaryl ketones and their supramolecular orbifloxacin drugs were also investigated. All the newly synthesized compounds were characterized by H-NMR,MS and IR *** antimicrobial results exhibited that the target benzimidazoliums and their orbifloxacin supermolecules displayed excellent antibacterial and antifungal activities against all tested strains.

关键词： benzimidazolium antimicrobial orbifloxacin supramolecular drugs

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纳米润滑添加剂改善摩擦磨损提高发动机性能的研究

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润滑与密封 2018年第6期43卷 1-5页

作者：侯献军王士成 MOHAMED kamal Ahmed ali 现代汽车零部件技术湖北省重点实验室(武汉理工大学) 湖北武汉430070 汽车零部件技术湖北省协同创新中心湖北武汉430070

以5W-30润滑油为基础油,Al_2O_3/TiO_2为纳米添加剂,配制添加剂质量分数为2%的纳米润滑油。通过摩擦学性能试验台模拟缸套-活塞环摩擦副实际工作过程,研究Al_2O_3/TiO_2纳米添加剂对摩擦学性能的改善;通过场发射扫描电镜(FESEM)对活塞... 详细信息

以5W-30润滑油为基础油,Al_2O_3/TiO_2为纳米添加剂,配制添加剂质量分数为2%的纳米润滑油。通过摩擦学性能试验台模拟缸套-活塞环摩擦副实际工作过程,研究Al_2O_3/TiO_2纳米添加剂对摩擦学性能的改善;通过场发射扫描电镜(FESEM)对活塞环样本微观形貌进行观察,确定表面磨损情况;通过发动机台架实验研究确定实际使用工作过程中,纳米添加剂对发动机动力性能的影响。结果表明,润滑油中加入Al_2O_3/TiO_2纳米添加剂后,缸套-活塞环摩擦副摩擦磨损性能得到明显改善,摩擦因数和活塞环磨损率显著下降,摩擦因数最大下降50.6%,平均下降42%;活塞环磨损率最大下降34.8%,平均下降27.2%;活塞环表面微观形貌得到明显改善,磨损表面得到修复,划痕显著减少;在转速为4 400 r/min时随着负荷逐渐增大,发动机台架实验输出功率最高提升24.2%,低负荷功率增幅显著,高负荷范围内功率平均提升3.3%,动力性能得到较大提升。

关键词：润滑油纳米添加剂摩擦磨损

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Genetic Diversity among Some Sheep Breeds in Sulaimani Governorate Using RAPD-PCR Technique

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Journal of Life Sciences 2013年第9期7卷 971-979页

作者： Yousif Muhammad Salih Al-Barzinj Muqdad kamal ali Animal Resource Department College of Agriculture University of Salahaddin Erbil 44001 Iraq Animal Production Department Faculty of Agriculture University of Sulamania Sulamania 334 lraq

RAPD （Random amplified polymorphic DNA） markers were used to study genetic diversity among three Kurdish sheep breeds （the Karadi, Hamdani and Jaff） with the Awassi sheep breed. A total of 40 samples were typed using twenty RAPD primers. Ten out of the twenty primers had clear bands, which used to investigate the genetic variations among breeds. One of the ten primers is monomorphism. A total of 109 bands were scored, of which 46 bands （46.56%） were polymorphic and 18 of polymorphic band were unique bands. For all breeds, Nei＇s gene diversity, Shannon index, percentage of polymorphic loci and unique bands are respectively in the range of 0.32 to 0.50, 0.44 to 0.69, 31.81 to 100, and 2 to 8. Using UPGMA （unweighted pair-group method with arithmetic average） dendrogram, the three clusters, the 1st cluster branch consisted of the Karadi sheep breed, the 2nd cluster was include both of the Jaff and Hamdani sheep breeds and the 3rd one included Awassi sheep breed. These results indicated that the Karadi sheep is most genetically distant from the Awassi sheep （0.916）. The Jaff and Hamdani sheep in the 2nd cluster indicate a close relationship between them and the results indicated that the Jaff and Hamdani sheep breeds were closer to Awassi sheep breed than to the Karadi sheep breed. The dendrograms show that there are high genetic distances among sheep breeds, and were ranged from 0.223 between Hamdani and Jaff sheep breeds to 0.916 between Karadi and Awassi sheep breeds. Based on the high degree of genetic distance among the four sheep breeds it is concluded that the four sheep breeds arc independent and isolated breeds.

关键词： RAPD-PCR Kurdish sheep breeds polymorphism genetic distance

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“一带一路”下中国与中东能源合作发展研究

“一带一路”下中国与中东能源合作发展研究

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作者： ALSHARABI kamal ali AHMED AHMED（卡拉）河北大学

学位级别：硕士

自2013年习近平主席提出建设“丝绸之路经济带”和“21世纪海上丝绸之路”以来,中国与中东国家经贸往来日趋活跃,能源关系发展迅速,能源合作己成为中国在中东推进“一带一路”倡议的重要内容和突破口。中国和中东在能源合作机制方面,进... 详细信息

自2013年习近平主席提出建设“丝绸之路经济带”和“21世纪海上丝绸之路”以来,中国与中东国家经贸往来日趋活跃,能源关系发展迅速,能源合作己成为中国在中东推进“一带一路”倡议的重要内容和突破口。中国和中东在能源合作机制方面,进行了有益的探索,并且取得了一些成就。因为国际局势的复杂多变和中东地区的政治稳定等因素的影响,中国和中东地区的能源合作还面临很多风险和挑战,需要双方在现有的框架内,本着互惠互利、共享共建等原则,进行平等对话和协商。论文主要的研究内容是:(1)分析“一带一路”对中国和中东能源的合作的影响机制,主要从能源合作的理论基础、战略对接、合作机制等方面进行分析。即将地缘政治、要素禀赋、比较优势、战略贸易等理论作为促进中国和中东能源合作的理论依据,并从合作广度、深度以及合作方向等方面分析了目前中国和中东国家能源合作机制的构建。(2)分析对中国与中东的能源合作状况。主要系统梳理了中国和中东能源合作规模和结构,以及从国际环境变化的角度分析面临的机遇和挑战。(3)提出加强中国和中东地区的能源合作的建议。通过分析并深入研究可知,中国和中东地区尤其是和海湾国家的能源合作越来越紧密,并且取得了一定的成果。目前面临良好的发展机遇,比如国际能源市场的变化,美国和中东各国在利益上出现了纠纷;中国“一带一路”在中东得到了各国政府的大力支持;在新能源领域仍有很大合作空间;美国撤军阿富汗丧失在中东地区话语权等。但是同时也面临一些挑战,比如地缘政治和安全问题、美国在中东地区的持续影响、“一带一路”受到排挤等。面对这些机遇和挑战,双方应该统一理念、完善合作机制、发挥外交桥梁作用、扩大合作领域、优化能源投资结构、加强互联互通等,推进中国和中东能源合作深入开展。

关键词： “一带一路” 中国中东能源合作

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Utilization of Amaranth Flour in Preparation of High Nutritional Value Bakery Products

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Food and Nutrition Sciences 2020年第5期11卷 336-354页

作者： Seham Yehia Gebreil Maha Ibrahim kamal ali Esraa Ahmed Mohamed Mousa Department of Crops Technology Research Food Technology Research Institute Agricultural Research Center Giza Egypt Department of Special Food and Nutrition Food Technology Research Institute Agricultural Research Center Giza Egypt

Amaranth has become an unconventional crop that interesting of scientists and researchers due to its unique nutritional properties, in addition to bear the water lack and be suitable for all types of soil. The objective of this study was to utilize amaranth flour in preparation of high nutritional value bakery products, crackers and tortilla produced by using amaranth flour instead of corn flour (w/w) by 0%, 25%, 50%, 75% and 100% levels substitution. The prepared products were evaluated for its chemical composition, minerals content, amino acids composition, fatty acid composition, color analysis, biological active compounds analysis and sensory evaluation. Results showed that substitution with amaranth flour increased protein, fat, ash and fiber. As for minerals and amino acid, it indicated that the formula No. 3 (25% corn flour/75% amaranth flour) in crackers and the formula No. 2 (50% corn flour/50% amaranth flour) in tortilla contained higher amount of minerals such as iron, calcium, potassium, zinc, magnesium, manganese, copper and phosphorus, and of the essential amino acids such as Leucine, Lysine and valine. On the other hand the formula No. 3 in crackers had the highest unsaturated fatty acids content and lowest of total saturated fatty acids content. While the formula No. 2 in tortilla had the highest saturated fatty acids content and lowest of unsaturated fatty acids content. The results also showed that the incorporation of amaranth flour in the preparation of the crackers and tortilla led to significantly decreased yellowness and lightness compared with control. Also, results indicated that crackers and tortilla which prepared with amaranth flour exhibited higher antioxidant activity than control formulas. Concerning sensory evaluation of crackers, results showed significant decrease in appearance, color and overall acceptability while, tortilla had significant decrease in general appearance, color and total score at all formulas. Based on the results

关键词： Amaranth High Nutritional Value Crackers Tortilla Nutritional Benefits

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Imidazole Bis-carbazole as Highly Selective Artificial Anion Receptor

Imidazole Bis-carbazole as Highly Selective Artificial Anion...

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大环化学和超分子化学的新发展——当前学科交叉的一个重要桥梁——中国化学会全国第十五届大环化学暨第七届超分子化学学术讨论会

作者：颜建平 ali kamal Attia Haroon 周成合 School of Chemistry and Chemical Engineering Southwest University

A novel imidazole bis-carbazole with amide linker as artificial anion receptor was designed and synthesized successfully,and confirmed by MS,IR and NMR *** recognition to anions showed that the title compound exhibite... 详细信息

关键词： Bis-carbazole Supramolecular recognition Iodide

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缸套-活塞环摩擦学性能模拟实验研究

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润滑与密封 2017年第3期42卷 8-11,17页

作者：侯献军陈必成蔡清平 Mohamed kamal Ahmed ali 彭辅明现代汽车零部件技术湖北省重点实验室(武汉理工大学) 湖北武汉430070 汽车零部件技术湖北省协同创新中心湖北武汉430070

为模拟内燃机缸套-活塞环运动,设计适用于缸套-活塞环的往复式摩擦性能试验台,由传动系统、加热系统、加载系统组成。根据系统中悬臂梁和活塞环专用夹具不同的使用要求,分别进行结构设计和有限元分析。结果表明,当实验条件达到预设极限... 详细信息

为模拟内燃机缸套-活塞环运动,设计适用于缸套-活塞环的往复式摩擦性能试验台,由传动系统、加热系统、加载系统组成。根据系统中悬臂梁和活塞环专用夹具不同的使用要求,分别进行结构设计和有限元分析。结果表明,当实验条件达到预设极限值(加热温度130℃,摩擦力500 N)时悬臂梁和活塞环专用夹具均能满足使用要求。试验台使用二维力测力传感器,通过特殊装配设计,可同时测量摩擦力和法向负载。通过摩擦性能实验验证,缸套-活塞环在较低负荷(61.7、92.6、123.4 N)条件下,摩擦因数随转速的增大而急剧减小;在较高负荷(250.8、322.5 N)条件下,摩擦因数随转速的增大有所减小并逐渐趋于稳定状态。

关键词：摩擦性能试验台结构设计缸套-活塞环摩擦因数

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