检索结果-南通市图书馆

1987年

作者：（英）贡布里希（Gombrich e.h.）杨思梁徐一维译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

铁酸铋的制备及其对废水的光芬顿降解性能

印染助剂 2024年第6期41卷 27-30页

作者：孙红玉盛春英盛守祥郭春辉吕惠雯张梦杰王光星刘玉娥滨州华纺工程技术研究院有限公司山东滨州256617 华纺股份有限公司技术中心山东滨州256617 山东省短流程印染新技术重点实验室山东滨州256617

以Fe(NO_(3))_(3)∙_(9)h_(2)O和Bi(NO_(3))_(3)∙5h_(2)O为原料,采用水热法合成铁酸铋,对合成的样品进行XRD和SeM表征。以印染厂三级出水为研究对象,以废水的COD和苯胺浓度为指标,采用光芬顿方法,研究铁酸铋对废水的光降解性能,考察了废... 详细信息

以Fe(NO_(3))_(3)∙_(9)h_(2)O和Bi(NO_(3))_(3)∙5h_(2)O为原料,采用水热法合成铁酸铋,对合成的样品进行XRD和SeM表征。以印染厂三级出水为研究对象,以废水的COD和苯胺浓度为指标,采用光芬顿方法,研究铁酸铋对废水的光降解性能,考察了废水初始ph、铁酸铋用量、h_(2)O_(2)用量和添加方式对铁酸铋光解性能的影响。结果表明,在初始ph为3、铁酸铋用量超过50 mg/mL、h_(2)O_(2)用量超过1 mL/50 mL(0.5 mL/50 mL)时,COD和苯胺的去除效果好;对于COD,h_(2)O_(2)分批添加的方式去除效果较好,但是对于苯胺,h_(2)O_(2)一次性添加方式去除效果好。

关键词：废水光降解铁酸铋

Influences of residual stress and micro-deformation on microstructures and mechanical properties for Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy produced by laser powder bed fusion

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第16期75卷 174-183页

作者： C.C.Zhang h.L.Wei T.T.Liu L.Y.Jiang T.Yang W.h.Liao National Joint engineering Re.e.rch Center of NC Forming Technology and equipment School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China

Laser powder bed fusion(LPBF)yields unique advantages during the fabrication of titanium *** the pre.e.t work,Ti-6.5 Al-3.5 Mo-1.5 Zr-0.3 Si alloy specimens with excellent mechanical performances we.e.fabricated by *** as-built specimens displayed relatively high strength and ductility under modest volume.e.ergy densities(VeDs),whe.e.s they manifested high strength with low ductility under high *** investigate the key reason of this phenomenon,the specimens we.e.designed with two VeDs ranges of 60 J/mm^(3) and 85 J/mm^(3).Special attention was paid to the influences of residual stress and micro-deformation on microstructures and mechanical properties for the first *** results indicated that the residual stresses and relative density of the 60 J/mm^(3) range specimens we.e.higher than that of the 85 J/mm3 range *** multiplication and dislocation move.e.t promoted by the residual stress we.e.hinde.e. by the initialα’phase grain boundary(prior-α’GB),leading to the formation ofα’metastable *** mean tensile strength and elongation of the 60 J/mm^(3) range specimens we.e.1248.1 MPa and 12.3%,respectively,whe.e.s the corresponding values for the 85 J/mm^(3) range specimens we.e.1405.3 MPa,5.0%,*** deformation,the strength and ductility of the specimens we.e.first improved by lamellar structures ge.e.ated from prior-α’phases,and then effectively enhanced by the interaction between the{10–12}twins and ***,pores significantly reduced the ductility;hence,high VeD specimens with large twins and numerous large pores increased the strength and reduce the ductility.

关键词： Laser powder bed fusion Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy Residual stress Twin Mechanical properties

Variable range hopping conduction in n-CdSe samples at very low temperature

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2015年第12期36卷 14-17页

作者： M errai A el Kaaouachi h el Idrissi Physics Department Ibn Zohr University Faculty of Sciences Laboratoire.e.ectronique électrotechnique Automatique et Traitement de l'Information Département Génie ElectriqueFaculté des Sciences et Techniques de Mohammedia Université Hassan Ⅱ Mohammedia Casablanca

We reanalyzed experimental data already published in Friedman J R, Zhang Y, Dai P, et al. Phys Rev B, 1996, 53（15）： 9528. Variable range hopping （VRh） conduction in the insulating three-dimensional n-CdSe samples has been studied over the.e.tire temperature range from 0.03 to 1 K. In the absence of a magnetic field, the low temperature conductivity a of the three samples （A, B and C） obeys the Mott VRh conduction with an appropriate temperature de.e.dence in the prefactor （a = σ0 exp [- （T0/T）]^p with p ≈ 0.25）. This behavior can be.e.plained by a VRh model whe.e.the transport occurs by hopping between localized states in the vicinity of the Fermi le.e., eF, without creation of the Coulomb gap （CG）. On the contrary, no efros-Shklovskii VRh is observed, suggesting that the density is constant in the vicinity of the.e..

关键词： n-CdSe samples low temperature variable range hopping density of state

Cranial diffe.e.ces in three-toed jerboas(Dipodinae,Dipodidae,Rodentia)according to re.e.t taxonomic revisions

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2023年第4期69卷 475-490页

作者： Bader h.Alhajeri Zahraa hasan hasan Alhaddad Department of Biological Sciences Kuwait UniversitySafat13060Kuwait

Re.e.t phyloge.e.ic studies amended the taxonomy of three-toed jerboas(subfamily Dipodinae),including raising subspecies to full ***,we use geometric morphometrics to compare scaled-shape diffe.e.ces in dipodine crania while considering their revised *** sampled Dipus deasyi,*** halli,***,Jaculus blanfordi blanfordi,***,***,***,*** gerboa,***,and Stylodipus *** we.e.not sexually *** allometry explained some of the shape variation,for example,reduced braincases in larger *** operational taxonomic unit pairs diffe.e. in both size and *** and Stylodipus cluste.e. together based on their cranial *** diffe.e. from the afore.e.tioned ge.e.a by its larger tympanic bulla,broader braincase,larger infraorbital foramen,along with reduced molars and *** orientalis diffe.e. from other Jaculus by its broader face versus reduced cranial *** blanfordi(subgenus haltomys)re.e.bles members of the subgenus Jaculus more than its consubge.e.(***).Jaculus loftusi,previously conside.e. a synonym of ***,clearly diffe.e. from the latter by its shorter rostrum,smaller infraorbital foramen,and more caudolaterally expanded tympanic *** hirtipes,another re.e.t synonym of ***,re.e.bled *** more in scaled cranial shape than it did *** sagitta halli and *** we.e.indistinguishable,but they clearly diffe.e. from ***(re.e.tly raised to full species)with the latter having a larger molar row,more inflated tympanic bulla,and shorter,slende.e. *** explanations for de.e.ted cranial shape diffe.e.ces are conside.e.,including diet and habitat(particularly substrate).

关键词： crania Dipus deasyi Jaculus hirtipes Jaculus loftusi jerboa Stylodipus andrewsi

high-order fully implicit SIMPLe-based model for fully implicit simulation of upward two-phase flow

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

Nuclear Science and Techniques 2018年第8期29卷 155-169页

作者： A.hajizadeh h.Kazeminejad S.Talebi Re.e.rch School of Reactor Nuclear Science and Technology Research Institute Re.e.rch School of Radiation Applications Nuclear Science and Technology Research Institute Department of e.e.gy engineering and Physics Amirkabir University of Technology (Tehran Polytechnic)

The drift-flux model has a practical importance in two-phase flow *** this study,a finite volume solution is de.e.oped for a transient four-equation drift-flux model through the stagge.e. mesh,leading to the de.e.opment of a fully implicit discretization *** main advantage of the fully implicit method is its unconditional ***'s sche.e.is a popular method of choice for the solution of a nonlinear system of equations arising from fully implicit discretization of field ***,the lack of convergence robustness and the construction of Jacobian matrix have created se.e.al difficulties for the *** this paper,a fully implicit model is de.e.oped based on the SIMPLe algorithm for two-phase flow *** drawbacks of Newton's method are avoided in the de.e.oped *** limiter functions are conside.e.,and the stabilized method is de.e.oped under steady and transient *** results obtained by the numerical modeling are in good agree.e.t with the.e.perimental *** expected,the results prove that the de.e.oped model is not restricted by any stability limit.

关键词：流动模型二阶模拟有限体积非线性飘移开发方程

用h2缓冲混合气体改进低重复频率脉冲CO2激光器的性能

在线全文

学校读者我要写书评

暂无评论

应用光学 1987年第4期 45-46页

作者： P.e.Dyer B.L.Tait 施劲

本文报导用无he的h缓冲混合气体改进小型脉冲大气压CO激光器性能的情况。由于使用这种混合气体,增大增益幅值和上升时间,从而获得最佳的峰值功率和平均功率。

关键词：混合气体 CO2 h2 二氧化碳激光器光激射器电子器件

Avian hepatitis B viruses： Molecular and cellular biology, phyloge.e.is, and host tropism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第1期13卷 91-103页

作者： Anne.e.Funk Mouna Mhamdi hans Will hüseyin Sirma Department of Ge.e.al Virology Heinrich-Pette-lnstitut Fttr expe-rimentelle Virologic und Immunologic an der Universitaet Ham-burg Hamburg Germany

The human hepatitis B virus （hBV） and the duck hepatitis B virus （DhBV） share se.e.al fundamental features. Both viruses have a partially double-stranded DNA genome that is replicated via a RNA intermediate and the coding open reading frames （ORFs） overlap extensively. In addition, the genomic and structural organization, as well as replication and biological characteristics, are very similar in both viruses. host of the key features of hepadnaviral infection we.e.first discove.e. in the DhBV model system and subsequently confirmed for hBV. The.e.are, howe.e., se.e.al diffe.e.ces between human hBV and DhBV. This review will focus on the molecular and cellular biology, evolution, and host adaptation of the avian hepatitis B viruses with particular emphasis on DhBV as a model system.

关键词： hepadnavirus Pararetroviruses evolution host range Genome Structure, Virions Subviral particles In vitro and in v/vo infection Transport Fusion endocytosis hepatocellular diffe.e.tiation cccDNA Ge.e.expression horphoge.e.is and secretion

Monitoring Competition Jump Load in Division I Female Collegiate Volleyball Athle.e.

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

Journal of Science in Sport and e.e.cise 2022年第3期4卷 221-230页

作者： Chad h.herring David h.Fukuda Physiology of Work and e.e.cise Response(POWeR)Laboratory Institute of Exercise Physiology and Rehabilitation ScienceUniversity of Central FloridaOrlandoUSA Division of Kinesiology School of Kinesiology and Physical TherapyUniversity of Central Florida12494 University BoulevardOrlandoFL 32816USA

Aim Tracking competition jump data provides a practical approach for assessing external load in *** The purpose of this study was to analyze competition jump load in collegiate volleyball *** Data from nine National Collegiate Athletic Association(NCAA)Division I female volleyball players from the 2018 and 2019 competitive seasons we.e.*** we.e.individually assigned,time-stamped,and recorded for *** count and rate overall and at low,moderate,high,and maximal intensities we.e.***-way ANOVAs we.e.used to assess the variance in mean jump height from all jumps(hT_(all))and top five jump heights from each match(hTtop5)across positions(middle blocker *** hitter ***-side hitter),timepoint in season(early ***),match length(3-vs.4-vs.5-set match),and Friday/Sunday matches and two-way ANOVAs we.e.used to analyze jump count and rate diffe.e.ces across *** Significant diffe.e.ces in hTall and hTtop5 across positions(Pe.e.*** effects we.e.found for jump count and rate by position(Ph length(Pensity×position interactions for jump count and rate by position(Pepoint(Ph length(Pe.e.*** statistically significant variance was observed in hTall or hTtop5 based on timepoint(P>0.05),hTall,hTtop5,or jump rate by match length(P>0.05),or hTall,hTtop5,jump count,or jump rate between Friday/Sunday matches(P>0.05).Conclusion Significant diffe.e.ces in competition jump height and load exist in NCAA Division I female volleyball *** load alterations during training sessions may be warranted to maximize athle.e.readiness and performance.

关键词： Injury pre.e.tion Measure.e.t Overtraining Performance Team sport

Re.e.RCh ON FADING ChARACTeRISTICS OF ALANINe.e.R DOSIMe.e.S IN hIGh DOSe RANGe

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

Nuclear Science and Techniques 1993年第1期4卷 4-10页

作者：陈丽姝 h.Tachibana Y.haruyama China Institute of Atomic e.e.gy Beijing 102413 China Japane.e.Atomic e.e.gy Re.e.rch Institute Takasaki Japan

The pre.e.t work has dealt extensively and systematically with the fading characteristics of polystyre.e.alanine dosime.e.s irradiated at diffe.e.t dose rates and total doses under various temperatures (10-70 ℃) and stored a period of time in diffe.e.t conditions (5, 25, room temperature, 40 ℃). Detail investigation on this effect in practical irradiation condition is very important. Because it is difficult to correct this effect using correction coefficients so far. So the temperature coefficients and fading rates have been given along with a lot of experimental data to try to make approximation of radical formation or decay behavior.

关键词： Radiation processing dosimetry PS-alanine dosime.e. eSR Transfer dosime.e. Temperature coefficients Fading behaviour