检索结果-南通市图书馆

On the Dynamics of a Viscoelastic Fluid-Conveying Nanotube

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & materials Processing 2022年第4期18卷 1137-1151页

作者： Ola Adil Ibrahim Gunawan Widjaja Abdulhussien N.Alattabi Krishanveer Singh yasser Fakri mustafa P.A.Krovopuskov mustafa m.Kadhim General Directorate of Curricula-ministry of Education-Iraq Baghdad10020Iraq Senior Lecturer Faculty of Public Health Universitas Indonesia/Faculty of Law Universitas Krisnadwipayana Jakarta11440Indonesia College of Petroleum Engineering Al-Ayen UniversityThi-Qar64005Iraq GLA University mathura-India MathuraChaumuhanUttar Pradesh281406India Department of Pharmaceutical Chemistry College of PharmacyUniversity of MosulMosul41002Iraq Lipetsk State Technical University Lipetsk398600Russia Department of Dentistry Kut University CollegeKutWasit52001Iraq

The objective of the presented study is to perform a vibration analysis and investigate the stability of a viscoelastic-fluid conveying pipe with an intermediate *** mathematical model is elaborated in the framework of the Euler-Bernoulli beam theory in combination with the Kelvin-Voight viscoelastic *** resulting differential equation of motion and the related boundary conditions and compatibility conditions in the mid-span support are solved analytically using a power series *** results show that an intermediate support located atξ_(s)=0.1 andξ_(s)=0.5 increases the critical velocity up to 35%and 50.15%,***,the non-dimensional critical velocity for an intermediate support atξ_(s)=0.1 is 4.83.

关键词： Fluid conveying carbon nanotube viscoelastic structural damping natural frequencies analytical method

Evaluation of Large-Scale Housing Projects in Terms of Their Compatibility to Criteria of Environmental Design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2016年第2期10卷 157-165页

作者： yasser Aref Tasneem m. Khalil Department of Architecture Faculty of Engineering Menoufia University Menoufia 32511 Egypt Water and Sewage Company Menoufia 32511 Egypt

The design and execution of large-scale housing projects always have negative environmental impacts in terms of excessive consumption of non-renewable energy resources and environmental pollution. These negative impacts are multiplied in the case of large-scale housing projects where a large number of standardized units are implemented in a repeated manner. This proposed paper will study and evaluate the environmental impacts of large-scale housing projects according to criteria of environmental design. The case study project is Haram City that is a housing project for small low-income families. The project consists of 50,000 housing units and is located in 6th of October City, which has a hot dry desert climate that necessitates special design considerations and applications of environmental design concepts. The project will be analyzed and evaluated in terms of site layout, design of buildings, orientation, materials used, construction techniques, thermal behavior, landscaping, etc.

关键词： Green architecture environmentally-friendly buildings low-cost housing projects environmental design concepts.

Does the presence of a percutaneous renal access influence fluoroscopy time during percutaneous nephrolithotomy?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2015年第4期2卷 220-223页

作者： yasser A.Noureldin mohamed A.Elkoushy Sero Andonian Division of Urology McGill University Health CentreMontrealQuebecCanada Department of Urology Benha University HospitalBenha UniversityBenhaEgypt Department of Urology Suez Canal UniversityIsmailiaEgypt

Objective:The aim of this study was to assess whether the presence of a preformed percutaneous renal access(PCA)had any effects on fluoroscopy time(FT)during percutaneous nephrolithotomy(PCNL).methods:After ethics approval was obtained,medical records of all patients who underwent PCNL between 2009 and 2013 at a tertiary stone referral centre were retrospectively *** with and without pre-formed PCA undergoing PCNL were *** who underwent second-look PCNL and those who had their access inserted by interventional radiology constituted the group with pre-formed ***:A total of 185 PCNLs were *** mean patient age was 55.2±1.0 years with mean body mass index(BmI)of 27.8±0.5 kg/m^2 and male gender of 63.8%.The mean stone size was 618.4±47.0 mm^2 with mean Guy’s grade of 2.3±0.7 and mean *** of 7.6±*** mean operative time was 98.7±2.6 min with mean FT of 113.4±4.5 *** overall stone-free rate was 71.9%with complication rate of 16.2%.When compared with PCNLs without pre-formed PCA,PCNLs with pre-formed PCA were associated with significantly shorter FT(120.6±5.1 vs.77.5±6.7 s;pmated blood loss(EBL)(p=0.01).On multivariate analysis,PCNLs with pre-formed PCA were associated with significantly shorter FT(***=-43.2(95%CI:-66.4 to-20);pmed PCA were associated with significantly lower FT and EBL when compared with PCNLs without pre-formed PCA.

关键词： Fluoroscopy Percutaneous nephrolithotomy Renal access

THERmOmECHANICAL mODELING OF POLYmER NANOCOmPOSITES BY THE ASYmPTOTIC HOmOGENIZATION mETHOD

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

THERMOMECHANICAL MODELING OF POLYMER NANOCOMPOSITES BY THE A...

Fabrication of 3D air-core mEmS inductors for very-highfrequency power conversions

第二届亚洲功能材料与结构力学大会

作者： yasser m.Shabana mechanical Design Department Faculty of Engineering-Mataria

＜正＞There is much current interest to incorporate nano-scale fillers into polymer matrices to achieve potentially unique *** to traditional microcomposites,nanocomposites have significant large ratio of interface area to volume that results in improved thermomechanical *** thermomechanical properties of polymer nanocomposites,to achieve the ever-increasing performance requirements,can be obtained by tailoring their *** this end,computational analyses of the relations between the thermomechanical properties,e.g.,yield strength,Young modulus,shear modulus,Poisson ratio and coefficient of thermal expansion,in different directions and the microstructures of polymer nanocomposites are *** asymptotic homogenization method （AHm） based on finite element analysis（FEA） is used to model the thermomechanical behaviors of different polymer nanocomposites with periodic *** effects of adding silica and rubber nanoparticles to epoxy resin as a polymer matrix are *** of the nano-particles which differ in volume fraction,material type,size and/or geometry are *** predictions of thermomechanical properties are compared with experimental data.

关键词： Nano-structures Polymer-matrix composites(PmCs) Thermomechanical Computational modeling

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

microsystems & Nanoengineering 2018年第1期4卷 509-517页

作者： Hoa Thanh Le Io mizushima yasser Nour Peter Torben Tang Arnold Knott Ziwei Ouyang Flemming Jensen Anpan Han National Center for micro-and Nanofabrication DanchipTechnical University of Denmark2800 Kongens LyngbyDenmark Department of Electrical Engineering Technical University of Denmark2800 Kongens LyngbyDenmark IPU Nils Koppels Allé2800 Kongens LyngbyDenmark

We report a fabrication technology for 3D air-core inductors for small footprint and very-high-frequency power *** process is scalable and highly generic for fabricating inductors with a wide range of geometries and core *** demonstrate spiral,solenoid,and toroidal inductors,a toroidal transformer and inductor with advanced geometries that cannot be produced by wire winding *** inductors are embedded in a silicon substrate and consist of through-silicon vias and suspended *** inductors fabricated with 20 and 25 turns and 280-350μm heights on 4-16 mm2 footprints have an inductance from 34.2 to 44.6 nH and a quality factor from 10 to 13 at frequencies ranging from 30 to 72 *** air-core inductors show threefold lower parasitic capacitance and up to a 140% higher-quality factor and a 230% higher-operation frequency than silicon-core inductors.A 33 mHz boost converter mounted with an air-core toroidal inductor achieves an efficiency of 68.2%,which is better than converters mounted with a Si-core inductor(64.1%).Our inductors show good thermal cycling stability,and they are mechanically stable after vibration and 2-m-drop tests.

关键词： mEmS inductor PwrSoC TSVs very high frequency 3D

medical Diagnosis Using machine Learning:A Statistical Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, materials & Continua 2021年第4期67卷 107-125页

作者： Kaustubh Arun Bhavsar Jimmy Singla yasser D.Al-Otaibi Oh-Young Song Yousaf Bin Zikria Ali Kashif Bashir Lovely Professional University Jalandhar144411India Department of Information Systems Faculty of Computing and Information Technology in RabighKing Abdulaziz UniversityJeddah21589Saudi Arabia Software Department Sejong UniversitySeoul05006Korea Department of Information and Communication Engineering Yeungnam UniversityGyeongsan38541Korea Department of Computing and mathematics Manchester Metropolitan UniversityManchesterM156BHUK

Decision making in case of medical diagnosis is a complicated process.A large number of overlapping structures and cases,and distractions,tiredness,and limitations with the human visual system can lead to inappropriate *** learning(mL)methods have been employed to assist clinicians in overcoming these limitations and in making informed and correct decisions in disease *** academic papers involving the use of machine learning for disease diagnosis have been increasingly getting ***,to determine the use of mL to improve the diagnosis in varied medical disciplines,a systematic review is conducted in this *** carry out the review,six different databases are *** and exclusion criteria are employed to limit the ***,the eligible articles are classied depending on publication year,authors,type of articles,research objective,inputs and outputs,problem and research gaps,and ndings and *** the selected articles are analyzed to show the impact of mL methods in improving the disease *** ndings of this study show the most used mL methods and the most common diseases that are focused on by *** also shows the increase in use of machine learning for disease diagnosis over the *** results will help in focusing on those areas which are neglected and also to determine various ways in which mL methods could be employed to achieve desirable results.

关键词： Decision making disease diagnosis machine learning medical disciplines

Functional roles of ornithine decarboxylase and arginine decarboxylase during the peri-implantation period of pregnancy in sheep

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2018年第2期9卷 306-318页

作者： yasser Y.Lenis Gregory A.Johnson Xiaoqiu Wang Wendy W.Tang Kathrin A.Dunlap m.Carey Satterfield Guoyao Wu Thomas R.Hansen Fuller W.Bazer Department of Animal Science Texas A&M UniversityCollege StationTX 77843-2471USA Center for Animal Biotechnology and Genomics Texas A&M UniversityCollege StationTX 77843USA Centauro Research Group School of Veterinary MedicineFaculty of Agrarian ScienceUniversidad de AntioquiaCalle 70 No52-21 MedellínColombia Faculty of Agricultural Sciences Calle 222 No.55-37UDCABogotaColombia Present address:National Institute of Environmental Health Sciences Research Triangle ParkNC 27709USA Animal Reproduction and Biotechnology Laboratory Department of Biomedical SciencesCollege of Veterinary Medicine and Biomedical SciencesColorado State UniversityFort CollinsCO 80523USA

Background: Polyamines stimulate DNA transcription and m RNA translation for protein synthesis in trophectoderm cells, as well as proliferation and migration of cells; therefore, they are essential for development and survival of conceptuses(embryo/fetus and placenta). The ovine conceptus produces polyamines via classical and non-classical pathways. In the classical pathway, arginine(Arg) is transformed into ornithine, which is then decarboxylated by ornithine decarboxylase(ODC1) to produce putrescine which is the substrate for the production of spermidine and spermine. In the non-classical pathway, Arg is converted to agmatine(Agm) by arginine decarboxylase(ADC), and Agm is converted to putrescine by agmatinase(AGmAT).methods: morpholino antisense oligonucleotides(mAOs) were designed and synthesized to inhibit translational initiation of the m RNAs for ODC1 and ADC, in ovine ***: The morphologies of mAO control, mAO-ODC1, and mAO-ADC conceptuses were normal. Double knockdown of ODC1 and ADC(mAO-ODC1:ADC) resulted in two phenotypes of conceptuses; 33% of conceptuses appeared to be morphological y and functional y normal(phenotype a) and 67% of the conceptuses presented an abnormal morphology and functionality(phenotype b). Furthermore, mAO-ODC1:ADC(a) conceptuses had greater tissue concentrations of Agm,putrescine, and spermidine than mAO control conceptuses, while mAO-ODC1:ADC(b) conceptuses only had greater tissue concentrations of Agm. Uterine flushes from ewes with mAO-ODC1:ADC(a) had greater amounts of arginine, aspartate, tyrosine, citrulline, lysine, phenylalanine, isoleucine, leucine, and glutamine, while uterine flushes of ewes with mAO-ODC1:ADC(b) conceptuses had lower amount of putrescine, spermidine, spermine, alanine, aspartate,glutamine, tyrosine, phenylalanine, isoleucine, leucine, and ***: The double-knockdown of translation of ODC1 and ADC m RNAs was most detrimental to conceptus development and their production of int

关键词： Agmatine Arginine Interferon tau Polyamines Trophectoderm cells

Determination of gamma ray spectrometry efficiency for the attenuation coefficients of some bismuth borate glasses by mCNP and(ISOCS)techniques

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

Radiation Detection Technology and methods 2018年第2期2卷 67-74页

作者： Ahmed Y.El-Haseib Z.Ahmed yasser B.Saddeek Radiation Safety Department Egyptian Nuclear and Radiological Regulatory Authority(ENRRA)Nasr CityCairoEgypt Nuclear Safeguards and Physical Protection Department Egyptian Nuclear and Radiological Regulatory Authority(ENRRA)Nasr CityCairoEgypt Physics Department Faculty of ScienceAl-Azhar UniversityAssiut 71524Egypt

Background Radiation detection has been a main interest for researchers as all kind of produced particles in atomic and subatomic physics based on the measurement systems so-called *** efficiency is one of the main parameters in detection system besides many other different parameters of the *** detector in experimental physics is an instrument that converts radiation energy into an electrical signal,and this is achieved basically by either ionization or *** choice for any type of a detector(gas-filled,scintillation or semiconductor)for any application depends upon the X-ray of gamma energy range of interest.A working model is therefore developed which is capable of describing the overall NaI(Tl)detection efficiency as a function of several known *** The attenuation coefficients for the bismuth borate glasses with different concentrations were measured using gamma spectroscopy *** numerical absolute efficiency calibration of a detector can be determined by In-Situ Object Calibration Software(ISOCS)and monte Carlo Neutral Particle version 5(mCNP5)techniques which does not require any calibration standards or reference *** By using the ISOCS and mCNP5 methodologies,the full energy peak efficiency of a scintillator detector(3“X3”NaI(Tl))exposed to Co-60 and Cs-137 gamma ray sources with average accuracy range 0.126–1.224%for the used samples can be *** used materials are ternary and are located between the detector and the source to determine the attenuation coefficients for these samples by using the calculated full energy peak efficiencies of a *** The average accuracy ranged from−1.808 to 1.960%for linear attenuation coefficient(μ),while it ranged from−1.999 to 1.888%and from−1.924 to 1.960%for half value layer(HVL)and mass linear attenuation coefficient(μm),*** The calculated values of the absolute full energy peak efficiency have been used to determi

关键词： Detection efficiency Sodium iodine(NaI) Linear attenuation coefficient(μ) mass linear attenuation coefficient(μm) Half-value layer(HVL)

Eruptive Keratoacanthomas within a Red Ink Tattoo: A Case Report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Case Reports in Clinical medicine 2018年第8期7卷 470-475页

作者： Brayden Healey William Galbraith yasser m. Sammour Diane Baird Western University of Health Sciences College of Osteopathic medicine of the Pacific-Northwest Lebanon USA Cleveland Clinic Cleveland USA Diane Baird Dermatology Eugene USA

Background: There has been a longstanding debate regarding whether keratoacanthomas (KAs) are neoplastic or reactive/inflammatory lesions. Aim: The aim of this case report is to, within the aforementioned debate, offer support in favor of the potential reactive nature of keratoacanthomas. Case Presentation: A 64-year-old male presented with an eruption of 25 keratoacanthomas within a red ink tattoo. Eruptions were partially resolved over a matter of months, and completely resolved with treatment using oral Acitretin therapy. We believe this to be the third such reported case of eruptive KAs within only the red ink portions of a tattoo. Prior cases involved 2 and 8 KAs each. Discussion: multiple studies suggest that KAs are neoplastic in nature and very distinct from cutaneous squamous cell carcinoma. Especially interesting is the finding that KAs have increased expression of apoptotic genes;this is particularly notable because of the tendency for these lesions to spontaneously involute. Skin tumorigenesis can occur in predisposed individuals after carcinogen exposure, thus red ink possesses theoretical potential as a carcinogen. KAs could be seen in this case as in fact a reactive neoplasm.

关键词： Keratoacanthoma Squamous Cell Carcinoma Tattoo Red Ink Acitretin