检索结果-南通市图书馆

Experimental and Numerical Investigation on High-Pressure Centrifugal Pumps:Ultimate Pressure Formulation,Fatigue Life Assessment and Topological Optimization of Discharge Section

引用

Computer Modeling in Engineering & Sciences 2023年第12期137卷 2845-2865页

作者： Abdourahamane Salifou Adam Hatem Mrad Haykel Marouani yasser Fouad School of Engineering University of Québec in Abitibi-Témiscamingue(UQAT)Rouyn-NorandaQuébecJ9X 5E4Canada National Engineering School of Monastir LGMUniversity of MonastirMonastir5019Tunisia Department of Applied Mechanical Engineering College of Applied EngineeringMuzahimiyah BranchKing Saud UniversityRiyadh11421Saudi Arabia

A high percentage of failure in pump elements originates from *** study focuses on the discharge section behavior,made of ductile iron,under dynamic *** experimental protocol is established to collect the strain under pressurization and depressurization tests at specific *** experimental results are used to formulate the ultimate pressure expression function of the strain and the lateral surface of the discharge section and to validate finite element ***-Safe is then used to assess the fatigue life cycle using different types of fatigue criteria(Coffin-Manson,Morrow,Goodman,and Soderberg).When the pressure is under 3000 PSI,pumps have an unlimited service life of 107 cycles,regardless of the ***,for a pressure of 3555 PSI,only the Morrow criterion denotes a significant decrease in fatigue life cycles,as it considers the average *** topological optimization is then applied to the most critical pump model(with the lowest fatigue life cycle)to increase its fatigue *** the solid isotropic material with a penalization approach,the Abaqus Topology OptimizationModule is *** goal is to reduce the strain energy density while keeping the volume within *** to the findings,a 5%volume reduction causes the strain energy density to decrease from 1.06 to 0.66106 J/m^(3).According to Morrow,the fatigue life cycle at 3,555 PSI is 782,425 longer than the initial 309,742 cycles.

关键词： Centrifugal pump ultimate pressure fatigue life topological optimization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Recycled glass replacement as fine aggregate in self-compacting concrete

引用

Frontiers of Structural and Civil Engineering 2013年第4期7卷 419-428页

作者： yasser SHARIFI Mahmoud HOUSHIAR Behnam AGHEBATI Department of Civil Engineering Vali-e-Asr University of RafsanjanRafsanjanIran

With increasing environmental pressure to reduce solid waste and to recycle as much as possible,the concrete industry has adopted a number of methods to achieve this goal by replacement of waste glass with concrete composition *** to differences in mixture design,placement and consolidation techniques,the strength and durability of Self Compacting Concrete(SCC)may be different than those of conventional ***,replacement of waste glass with fine aggregate in SCC should deeply be investigated compared to conventional *** aim of the present study is to investigate the effect of glass replacement with fine aggregate on the SCC *** present study,fine aggregate has been replaced with waste glass in six different weight ratios ranging from 0%to 50%.Fresh results indicate that the flow-ability characteristics have been increased as the waste glass incorporated to paste ***,compressive,flexural and splitting strengths of concrete containing waste glass have been shown to decrease when the content of waste glass is *** strength reduction of concrete in different glass replacement ratios is not remarkable,thus it can be produced SCC with waste glass as fine aggregate in a standard manner.

关键词： Self Compacting Concrete(SCC) recycle glass fine aggregate fresh and hardened properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance Analysis of Multi-Channel CR Enabled IoT Network with Better Energy Harvesting

引用

Computers, Materials & Continua 2022年第4期71卷 183-197页

作者： Afiya Kiran Ahmad Karim yasser Obaid Alharbi Diaa Mohammed Uliyan Department of Computer Science BZ UniversityMultan6000Pakistan Department of Information Technology BZ UniversityMultanPakistan College of Computer Science and Engineering University of Ha’ilHailSaudi Arabia

Wireless Sensor Networks(WSNs)can be termed as an autoconfigured and infrastructure-less wireless networks to monitor physical or environmental conditions,such as temperature,sound,vibration,pressure and motion *** may comprise thousands of Internet of Things(IoT)devices to sense and collect data from its surrounding,process the data and take an automated and mechanized *** the other side the proliferation of these devices will soon cause radio spectrum ***,to facilitate these networks,we integrate Cognitive Radio(CR)functionality in these *** can sense the unutilized spectrum of licensed users and then use these empty bands when *** order to keep the IoT nodes functional all time,continuous energy is *** this reason the energy harvested techniques are preferred in IoT *** it is preferred to harvest Radio Frequency(RF)energy in the *** this paper a region based multi-channel architecture is *** which the coverage area of primary node is divided as Energy Harvesting Region and Communication *** Secondary User(SU)that are the licensed user is IoT enabled with Cognitive Radio(CR)techniques so we call it CR-enabled IoT node/device and is encouraged to harvest energy by utilizing radio frequency *** harvest energy efficiently and to reduce the energy consumption during sensing,the concept of overlapping region is given that supports to sense multiple channels simultaneously and help the SU to find best channel for transmitting data or to harvest energy from the ideal *** the experimental analysis,it is proved that SU can harvest more energy in overlapping region and this architecture proves to consume less energy during data transmission as compared to single *** also show that channel load can be highly reduced and channel utilization is proved to be more ***,this proves the proposed architecture cost-effective and energy-efficient.

关键词： Wireless sensor network multi-channel sensing energy harvesting cognitive radio IoT network

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Learning Model to Detect Android C&C Applications Using Hybrid Analysis

引用

Computer Systems Science & Engineering 2022年第12期43卷 915-930页

作者： Attia Qammar Ahmad Karim yasser Alharbi Mohammad Alsaffar Abdullah Alharbi Department of Information Technology Bahauddin Zakariya UniversityMultan60000Pakistan College of Computer Science and Engineering University of HailHa’il81451Saudi Arabia

Smartphone devices particularly Android devices are in use by billions of people everywhere in the ***,this increasing rate attracts mobile botnet attacks which is a network of interconnected nodes operated through the command and control(C&C)method to expand malicious *** present,mobile botnet attacks launched the Distributed denial of services(DDoS)that causes to steal of sensitive data,remote access,and spam generation,***quently,various approaches are defined in the literature to detect mobile botnet attacks using static or dynamic *** this paper,a novel hybrid model,the combination of static and dynamic methods that relies on machine learning to detect android botnet applications is ***,results are evaluated using machine learning *** Random Forest(RF)classifier outperform as compared to other ML techniques i.e.,Naïve Bayes(NB),Support Vector Machine(SVM),and Simple Logistic(SL).Our proposed framework achieved 97.48%accuracy in the detection of botnet ***,some future research directions are highlighted regarding botnet attacks detection for the entire community.

关键词： Android botnet botnet detection hybrid analysis machine learning classifiers mobile malware

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ROBUSTNESS OF EQUILIBRIA IN THE GRAPH MODEL FOR CONFLICT RESOLUTION

引用

Journal of Systems Science and Systems Engineering 2015年第4期24卷 450-465页

作者： yasser T.Matbouli D.Marc Kilgour Keith W.Hipel Department of Industrial Engineering King Abdulaziz University Department of Systems Design Engineering University of Waterloo Department of Mathematics Wilfrid Laurier University Centre for International Governance Innovation(CIGI)

A novel approach for assessing the robustness of an equilibrium in conflict resolution is presented. Roughly, an equilibrium is robust if it is resilient, or resistant to deviation. Robustness assessment is based on a new concept called Level of Freedom, which evaluates the relative freedom of a decision maker to escape an equilibrium. Resolutions of a conflict can be affected by changes in decision makers＇ preferences, which may destabilize an equilibrium, causing the conflict to evolve. Hence, a conflict may become long-term and thereby continue to evolve, even after reaching an equilibrium. The new robustness measure is used to rank equilibria based on robustness, to facilitate distinguishing equiiibria that are relatively sustainable. An absolutely robust equilibrium is a special case in which the level of freedom is at an absolute minimum for each individual stability definition.

关键词： Robustness equilibria level of freedom conflict evolution graph model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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 index<3(40/43,93.0%).Pseudomonas aeruginosa was the most commonly isolated microorganism from the pleural fluid(9/43,20.9%)and 16.3%of the cases(7/43)had polymicrobial *** drainage was performed in all cases while surgery was indicated in 24 cases(55.8%).The most common complication of COVID-19-related empyema was broncho-pleural fistula(2/43,4.7%).The mortality 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Preparation of solar-enhanced AlZnO@carbon nano-substrates for remediation of textile wastewaters

引用

Journal of Environmental Sciences 2020年第6期32卷 52-68页

作者： Esraa M.El-Fawal Sherif A.Younis yasser M.Moustafa Philippe Serp Central Laboratories Analysis and Evaluation DepartmentEgyptian Petroleum Research InstituteNasr CityCairo 11727Egypt Laboratoire de Chimie de Coordination(LCC) Unite Propre de Recherche(UPR)Du Centre National de La Recherche Scientifique(CNRS)8241Composante de L’Ecole Nationale D’Ingenieurs en Arts Chimiques et Technologiques(ENSIACET)Universite de ToulouseUniversite Paul Sabatier(UPS)Institut National Polytechnique(INP)-LCC4 Allee Emile Monso31030Toulouse Cedex 4France

Photoactive aluminum doped ZnO(AlZnO)was synthesized by sol-gel *** that,AlZnO photocatalyst was deposited on five carbon-based materials(CBMs)using ultrasonic route followed by solid-state mixing using ball *** CBMs used were poly aniline(PANI),carbon nitride(CN),carbon nanotubes(CNT),graphene(G),and carbon nanofibers(CNF).The crystal phases,elemental compositions,morphological,and optical properties of the AlZnO@CBMs composites were *** results revealed that two of AlZnO@CBMs composites exhibited superior bleaching efficiency(100%removal)and photocatalytic stability(three cycles)for 50μmol/L Methylene Blue(MB)contaminated water after 60 min irradiation in visible light at pH 6.5,0.7%H2O2,and 5 g/L inorganic *** optimum conditions,AlZnO@CBMs nanocomposites were employed for the treatment of mixed dyestuffs composed of MB,Methyl Orange(MO),Astrazone Blue FRR(BB 69),and Rhodamine B(RhB)dyes under dark,ultraviolet,visible,and direct *** mixed dyestuffs,the AlZnO@G achieved the highest dye sorption capacity(60.91μmol dye stuffs/g)with kinetic rate 8.22×10^-3 min^-1 in 90 min via multi-layer physisorption(Freundlich isotherm)on graphene *** additions,AlZnO@CN offered the highest photo-kinetic rate(Kphoto)of^54.1×10^-3 min^-1(93.8%after 60 min)under direct ***,the selective radical trapping experiment confirmed that the holes and oxidative superoxide radicals are crucial on dyes photodegradation *** to their superior performance,AlZnO@G and AlZnO@CN nanocomposites can offer an effective in-situ solar-assisted adsorption/photocatalytic remediation of textile wastewater effluents.

关键词： Carbon nanomaterials AlZnO photocatalyst Hybrid adsorption/photo-catalysis Kinetic and isotherm modeling Textile wastewater remediation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hepato-cardiac disorders

引用

World Journal of Hepatology 2014年第1期6卷 41-54页

作者： yasser Mahrous Fouad Reem Yehia Gastroenterology and Hepatology Unit Endemic Medicine Department Minia University

Understanding the mutual relationship between the liver and the heart is important for both hepatologists and cardiologists. Hepato-cardiac diseases can be classified into heart diseases affecting the liver, liver diseases affecting the heart, and conditions affecting the heart and the liver at the same time. Differential diagnoses of liver injury are extremely important in a cardiologist's clinical practice calling for collaboration between cardiologists and hepatologists due to the many other diseases that can affect the liver and mimic haemodynamic injury. Acute and chronic heart failure may lead to acute ischemic hepatitis or chronic congestive hepatopathy. Treatment in these cases should be directed to the primary heart disease. In patients with advanced liver disease, cirrhotic cardiomyopathy may develop including hemodynamic changes, diastolic and systolic dysfunctions, reduced cardiac performance and electrophysiological abnormalities. Cardiac evaluation is important for patients with liver diseases especially before and after liver transplantation. Liver transplantation may lead to the improvement of all cardiac changes and the reversal of cirrhotic cardiomyopathy. There are systemic diseases that may affect both the liver and the heart concomitantly including congenital, metabolic and inflammatory diseases as well as alcoholism. This review highlights these hepatocardiac

关键词： Cardiac cirrhosis Ischemic hepatitis Fatty liver Liver cirrhosis Heart failure

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Silicon micromirrors with three-dimensional curvature enabling lensless efficient coupling of free-space light

引用

Light(Science & Applications) 2013年第1期2卷 98-106页

作者： yasser M Sabry Bassam Saadany Diaa Khalil Tarik Bourouina Universite Paris-Est ESYCOM(EA 2552)ESIEE ParisF-93162 Noisy-le-GrandFrance Si-Ware Systems 3 Khaled Ibn El-Waleed StreetHeliopolisCairo 11361Egypt Electron.and Comm.Eng.Dept. Faculty of Eng.Ain-Shams UniversityCairoEgypt

Miniaturized optical benches process free-space light propagating in-plane with respect to the substrate and have a large variety of applications,including the coupling of light through an optical *** coupling efficiency is usually obtained using assembled micro-optical parts,which considerably increase the system cost and integration *** this work,we report a high coupling efficiency,monolithically integrated silicon micromirror with controlled three-dimensional(3D)curvature that is capable of manipulating optical beams propagating in the plane of the silicon *** on our theoretical modeling,a spherical micromirror with a microscale radius of curvature as small as twice the Gaussian beam Rayleigh range provides a 100%coupling efficiency over a relatively long optical path *** dimensionless parameters facilitates the elucidation of the role of key design parameters,including the mirror’s radii of curvature,independent of the wavelength.A micromachining method is presented for fabricating the 3D micromirror using fluorinated gas *** measured coupling efficiency was greater than 50%over a 200-mm optical path,compared to less than 10%afforded by a conventional flat micromirror,which was in good agreement with the *** the 3D micromirror,an optical cavity was formed with a round-trip diffraction loss of less than 0.4%,resulting in one order of magnitude enhancement in the measured quality factor.A nearly 100%coupling was also estimated when matching the sagittal and tangential radii of curvature of the presented micromirror’s *** reported class of 3D micromirrors may be an advantageous replacement for the optical lenses usually assembled in silicon photonics and optical benches by transforming them into real 3D monolithic systems while achieving wideband high coupling efficiency over submillimeter distances.

关键词： coupling efficiency Gaussian beam coupling micro-optics monolithic chip optical cavity optical fabrication optical benches silicon photonics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sequence Stratigraphy and Rudist Facies Development of the Upper Barremian-Lower Cenomanian Platform, Northern Sinai, Egypt

引用

Acta Geologica Sinica(English Edition) 2018年第1期92卷 286-310页

作者： yasser SALAMA Michael GRAMMER Shaban SABER Soheir EL-SHAZLY Gouda ABDEL-GAWAD Beni-Suef University Faculty of SciencesGeology Department Boone Pickens School of Geology Oklahoma State University

The Lower Cretaceous sections in northern Sinai are composed of the Risan Aneiza(upper Barremian-middle Albian) and the Halal(middle Albian-lower Cenomanian) formations. The facies reflect subtle paleobathymetry from inner to outer ramp facies. The inner ramp facies are peritidal, protected to open marine lagoons, shoals and rudist biostrome facies. The inner ramp facies grade northward into outer ramp deposits. The upper Barremian-lower Cenomanian succession is subdivided into nine depositional sequences correlated with those recognized in the neighbouring Tethyan areas. These sequences are subdivided into 19 medium-scale sequences based on the facies evolution, the recorded hardgrounds and flooding surfaces, interpreted as the result of eustatic sea level changes and local tectonic activities of the early Syrian Arc rifting stage. Each sequence contains a lower retrogradational parasequence set that constituted the transgressive systems tracts and an upper progradational parasequence set that formed the highstand systems tracts. Nine rudist levels are recorded in the upper Barremian through lower Cenomanian succession at Gabal Raghawi. At Gabal Yelleg two rudist levels are found in the Albian. The rudist levels are associated with the highstand systems tract deposits because of the suitability of the trophic conditions in the rudist-dominated ramp.

关键词： Cretaceous sequence stratigraphy rudists Sinai Egypt

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：