检索结果-南通市图书馆

Microstructural,Mechanical,Electrical,and Thermal Properties of the Bi-Sn-Ag Ternary Eutectic Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 147-154页

作者： kaya hasan ENGÍN Sevda AKER Aynur BüYüK Ugur ÇADIRLI Emin Faculty of Education Department of science EducationErciyes UniversityKayseriTurkey Faculty of Thech Department of Energy Systems EngineeringDumluplnar Univ.KütahyaTurkey Faculty of Education Department of Computer and instructional TechnologiesSiirt UniversitySürtTurkey Faculty of Arts and Sciences Department of PhysicsOmer Halisdemir UniversityNigdeTurkey

The development of lead-free solders has emerged as one of the key issues in the electronics packaging ***-Sn-Ag eutectic alloy has been considered as one of the lead-free solder materials that can replace the toxic Pb-Sn eutectic solder without increasing soldering *** investigated the effects of temperature gradient and growth rate on the mechanical,electrical and thermal properties of the BiSn-Ag ternary eutectic ***-47 wt%Sn-0.68 wt%Ag alloy was directionally solidified upward with different temperature gradients（G=2.33-5.66 K/mm） at a constant growth rate（V=13.25 μm/s） and with different growth rates（V=6.55-132.83 μm/s） at a constant temperature gradient（G=2.33 K/mm） in the growth *** microstructures（λ）,microhardness（HV）,tensile stress（σ）,electrical resistivity（ρ）,and thermal properties（△H,Cp,Tm） were measured on directionally solidified *** dependency of the λ,HV,σ,and ρ on G and V was *** to the experimental results,X values decrease with increasing G and V,but HV,λ,and ρ values increase with increasing G and *** of electrical resistivity（ρ） for cast samples with the temperature in the range of 300-400 K were also measured by using a standard dc four-point probe *** enthalpy of fusion（△H） and specific heat（Cp） for the same alloy was also determined by means of differential scanning calorimeter（DSC） from heating trace during the transformation from eutectic liquid to eutectic solid.

关键词： solidification microhardness tensile stress electrical resistivity enthalpy

Clinical,laboratory,and therapeutic differences between immunoglobulin E-mediated and non-immunoglobulin E-mediated cow’s milk protein allergy in children

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Pediatrics 2025年第1期14卷 78-92页

作者： hasan M Isa Marwa J Abdulnabi Nawra S Naser Fatema N Lahmda Noor M AlAnsari Zahra H Isa Afaf M Mohamed Department of Pediatrics Salmaniya Medical ComplexManama 26671Bahrain Department of Pediatrics Arabian Gulf UniversityManama 26671Bahrain Faculty of Medicine Mansoura UniversityMansoura 35516Egypt Public Health Directorate Ministry of HealthManama 26671Bahrain

BACKGROUND Although breast milk is ideal for newborns,in some cases,it is replaced with cow’s milk,which contains proteins that increase the risk of cow’s milk protein allergy(CMPA).AIM To evaluate CMPA prevalence in Bahrain and compare clinical characteristics of children with immunoglobulin E(IgE)-and non-IgE-mediated *** This retrospective cohort study examined children with CMPA diagnosed at the pediatric gastroenterology outpatient clinic of the Salmaniya Medical Complex,Bahrain,between 2014 and 2022,and assessed CMPA *** presentations,laboratory findings,dietary modifications,and outcomes were compared between children with IgE-mediated and non-IgE-mediated *** variables were compared using Fisher’s exact test or Pearson’sχ2 test,whereas continuous variables were compared using Student’s t-test or the Mann-Whitney U *** Of 8332 patients,6022(72.3%)adhered to their *** them,618(10.3%)were suggested of having CMPA and 595(96.3%)were included;CMPA prevalence was 2%.Most patients were Bahraini(93.8%)and males(55.3%).Non-IgE-mediated type accounted for 77.3%cases and IgE-mediated type,22.7%.IgE-mediated CMPA presented more in boys(P=0.030),and later in life(5.1 months±4.5 months vs 4.2 months±4.2 months,P=0.016,95%CI:0.08-1.73),had more associated diseases(P<0.001);and presented with more cutaneous(P=0.024)and respiratory(P=0.003)manifestations,severe symptoms[rash/dry skin(P=0.031),facial swelling/angioedema(P=0.003),failure to thrive(P=0.013),apparent life-threatening event(P<0.001)],and positive physical findings(P=0.002)than non-IgE-mediated *** patients were exclusively fed cow milk formula(50.3%).The amino acid-based formula(AAF)was most prescribed(60.5%)with no difference between the two types(P=0.173).Although breastfeeding was recommended to 49.6%,only 8.2%were exclusively ***-mediated CMPA was associated with a longer follow-up duration than non-IgE-mediated CMPA(17.3 months±14.0 mo

关键词： Children Milk allergy Immunoglobulin E Breastfeeding Infant formula Bahrain

Prenatal Diagnosis of an Apically Located Congenital Left Ventricular Aneurysm: A Rare Case

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

Congenital Heart Disease 2024年第1期19卷 123-129页

作者： Yücel kaya And Yavuz hasan Berkan Sayal Büşra Tsakir Gökalp Kabacaoğlu Kadriye NilayÖzcan Department of Perinatology Antalya Education and Research HospitalUniversity of Health SciencesAntalyaTurkey Department of Perinatology Faculty of MedicineSüleyman Demirel UniversityIspartaTurkey

Congenital ventricular aneurysm is a very rare cardiac anomaly.A diagnosis can be made during the prenatal period using fetal *** study presents a very rare apically located left ventricular aneurysm case,and the relevant literature was reviewed and *** this case,a 35-year-old,gravida 2,parity 1 preg-nant woman at 24 weeks of gestation,displayed a wide aneurysmal image in the left ventricular apical wall on fetal *** was a 1.79 mm muscular ventricular septal defect at the apical region of the interven-tricular *** the course of the color Doppler ultrasonography examination,an aberrantﬁbrous band within the left ventricle and consequent turbulentﬂow during systole were *** baby,born via cesarean section at 37 weeks of gestation,is now in its postnatal seventh ***,during echocardiographic follow-ups,changes have been observed,including mild to moderate mitral insufﬁciency and a decrease in systolic *** theseﬁndings,the clinical condition remains *** is of great importance to use a multidis-ciplinary approach in managing these rare cases that could lead to potential adverse outcomes during the antena-tal or postnatal periods.

关键词： Heart aneurysm prenatal diagnosis echocardiography congenital heart defects left ventricle

Earthquake behavior of steel cushion-implemented reinforced concrete frames

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

Earthquake Engineering and Engineering Vibration 2018年第2期17卷 385-401页

作者： hasan Ozkaynak Beykent University Civil Engineering DepartmentIstanbulTurkey

The earthquake performance of vulnerable structures can be increased by the implementation of supplementary energy-dissipative metallic *** main aim of this paper is to describe the earthquake behavior of steel cushionimplemented reinforced concrete frames（SCI-RCFR）in terms of displacement demands and energy *** quasi-static experiments were performed on steel cushions（SC）installed in reinforced concrete（RC）*** test results served as the basis of the analytical models of SCs and a bare reinforced concrete frame（B-RCFR）.These models were integrated in order to obtain the resulting analytical model of the ***-time history analyses（NTHA）were performed on the SCI-RCFR under the effects of the selected earthquake data *** to the NTHA,SC application is an effective technique for increasing the seismic performance of RC *** main portion of the earthquake input energy was dissipated through *** succeeded in decreasing the plastic energy demand on structural elements by almost 50% at distinct drift levels.

关键词： steel cushion energy dissipation non-linear time history analysis seismic performance

Dynamic response of an alluvial valley consists of three types of soil

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2020年第2期19卷 289-305页

作者： hasan Faik Kara Civil Engineering Department Trakya UniversityTurkey

Dynamic response of an alluvial valley consisting of three different types of soil was *** the twodimensional model,the alluvial valley was assumed to have half-cylindrical *** alluvial valley contained three different types of soil with different *** valley was surrounded by a *** of the soil types and the half-space were assumed to be isotropic,homogeneous and linear *** half-space was excited by simple harmonic SH-waves radiated from a strike-slip *** fault was assumed to have circular-arc shape in the mathematical *** governing equations were solved by using wave function expansion method where boundary conditions were relatively *** the regions where boundary conditions were more complex,finite difference method was ***,the wave propagation problem was solved *** obtained numerical results showed that surface displacement amplitudes are significantly affected by the material properties of the different soil types of the alluvial *** was also observed that the shapes of the soil types in the alluvial valley played a considerable role in surface displacements.

关键词： cylindrical SH-waves alluvial valley strike-slip fault

Two novel sets of UiO-66@metal oxide/graphene oxide Z-scheme heterojunction:Insight into tetracycline and malathion photodegradation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第5期32卷 222-236页

作者： Hanieh Fakhri hasan Bagheri Chemical Injuries Research Center Systems Biology and Poisonings InstituteBaqiyatallah University of Medical SciencesTehranIran

Nowadays,widespread researches have been focused on the development of effective photocatalysts to remove pollutants of the aquatic *** accordance with the universal studies,two new sets of UiO-66@metal oxide(including ZnO and TiO2)/graphene oxide heterojunctions were synthesized for photodegradation of aromatic(tetracycline)and nonaromatic(malathion)pollutants which are challenging cases in the *** dosage of the photocatalyst,pH of the solution,the type of metal oxide,and the presence of various scavengers are assayed parameters in this *** the optimum condition,maximum photodegradation efficiency is achieved in 90 min for tetracycline(81%)and malathion(100%)by the UiO-66@ZnO/graphene *** superior separation of charge carriers by Z-scheme mechanism,excellent electron mobility on layers of graphene oxide and high surface area are factors that enhanced the ***,in comparison with pure UiO-66,the band gaps belong to heterojunctions revealed a red shift in the absorption edge,which can be responsible for more expand adsorption of the solar *** organic carbon analysis verified the decontamination of these pollutants in the *** produced main intermediates during the photocatalytic process were identified and the possible degradation pathway *** general,the superior photocatalytic activity suggests that these designed photocatalysts can be a promising choice for having a clean future.

关键词： Metal-organic framework UiO-66 Photodegradation Malathion Tetracycline Z-scheme mechanism

Experimental and analytical assessment of the hypervelocity impact damage of GLAss fiber REinforced aluminum

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第7期18卷 1232-1246页

作者： Md.Zahid hasan Bangladesh Air Force Academy Bangladesh Air Force Base Matiur RahmanBAF Academy Road7404 JessoreKhulnaBangladesh

This article addresses the response of GLAss fiber REinforced aluminum to hypervelocity impacts of micrometeoroid analogs at impact velocities of 7 km/s and *** relation,the damage modes of different GLAss fiber REinforced aluminum configurations have been *** GLAss fiber REinforced aluminum configurations comprised six to twelve variably thick aluminum layers and up to four plies of glass fiber reinforced epoxy per composite *** impact experiments have been conducted with the help of a two-stage light-gas gun,wherein aluminum-and stainless steel projectiles were launched at velocities up to 7.15 km/*** inspection of the damage area suggested the dissipation of impact energy in elastic-plastic deformation,petalling,delamination,debonding,tensile failure of fibers,and pyrolysis of epoxy.A prevailing damage mode was not apparent *** quasi-isotropic ply orientation of S2-glass/FM94-epoxy laminates promoted the interference of shockand rarefaction waves and suppressed the damage area of GLAss fiber REinforced *** discriminate between the impact performance of different GLAss fiber REinforced aluminum configurations,the energy dissipated in different damage modes of GLAss fiber REinforced aluminum has been assessed *** terms of normalized energy,the cross-ply GLAss fiber REinforced aluminum dissipated higher energy in petal formation than in other primary damage *** normalized petalling energy was found to decline with the increase of impact *** outcomes of this study will help to optimize the GLAss fiber REinforced aluminum laminate,which will be employed as a bumper shield to prevent the fatal damage and the unzipping of a spacecraft pressure bulkhead.

关键词： Hypervelocity impact Petalling Fiber failure Volumetric compression Sublimation of epoxy

Stochastic Linear Programming for Optimal Planning of Battery Storage Systems Under Unbalanced-uncertain Conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 971-980页

作者： Reza Hemmati hasan Mehrjerdi Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Qatar University DohaQatar

Battery energy storage system(BESS)has already been studied to deal with uncertain parameters of the electrical systems such as loads and renewable ***,the BESS have not been properly studied under unbalanced operation of power *** paper aims to study the modelling and operation of BESS under unbalanced-uncertain conditions in the power *** proposed model manages the BESS to optimize energy cost,deal with load uncertainties,and settle the unbalanced loading at the same *** three-phase unbalanced-uncertain loads are modelled and the BESSs are utilized to produce separate charging/discharging pattern on each phase to remove the unbalanced *** IEEE 69-bus grid is considered as case *** load uncertainty is developed by Gaussian probability function and the stochastic programming is adopted to tackle the *** model is formulated as mixed-integer linear programming and solved by GAMS/*** results demonstrate that the model is able to deal with the unbalanced-uncertain conditions at the same *** model also minimizes the operation cost and satisfies all security constraints of power grid.

关键词： Battery energy storage system(BESS) singlephase storage planning unbalanced loading uncertainty

A Generalized State Space Average Model for Parallel DC-to-DC Converters

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第5期41卷 717-734页

作者： hasan Alrajhi Umm Al-Qura University Makkah21955Saudi Arabia

The high potentiality of integrating renewable energies,such as photovoltaic,into a modern electrical microgrid system,using DC-to-DC converters,raises some issues associated with controller loop design and system *** generalized state space average model(GSSAM)concept was consequently introduced to design a DC-to-DC converter controller in order to evaluate DC-to-DC converter performance and to conduct stability *** paper presents a GSSAM for parallel DC-to-DC converters,namely:buck,boost,and buck-boost *** rationale of this study is that modern electrical systems,such as DC networks,hybrid microgrids,and electric ships,are formed by parallel DC-to-DC converters with separate DC input ***,this paper proposes a GSSAM for any number of parallel DC-to-DC *** proposed GSSAM is validated and investigated in a time-domain simulation environment,namely a MATLAB/*** study compares the steady-state,transient,and oscillatory performance of the state-space average model with a fully detailed switching model.

关键词： Parallel DC-to-DC converters generalized state space average model buck converters boost converters buck-boost converters