检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

视盘的有效评估:与杯盘比的对比(英文)

国际眼科杂志 2011年第8期11卷 1314-1317页

作者：魏红 Camil. Zangal.i George l. Spaeth 四川大学华西医院眼科中国四川省成都市610041 威乐士眼科医院/杰佛逊医学院青光眼研究中心美国宾夕法尼亚州费城19107

青光眼是一种以进行性视盘变化和视野损失为特征的眼压相关性疾病。杯盘比在过去40a来都是评价视盘青光眼性改变的标准方法。然而我们却发现是一些小视盘的患者有典型青光眼性视野损失,而一些大视盘的患者却没有视野损失。杯盘比的检查... 详细信息

青光眼是一种以进行性视盘变化和视野损失为特征的眼压相关性疾病。杯盘比在过去40a来都是评价视盘青光眼性改变的标准方法。然而我们却发现是一些小视盘的患者有典型青光眼性视野损失,而一些大视盘的患者却没有视野损失。杯盘比的检查效力和可重复性都低于一些新的检查方法。视盘损伤可能度分级(DDl.)是一种衡量视盘盘沿面积、并且校正了视盘大小等影响因素的新型视盘评价方法。DDl.也许是评价青光眼视盘的更为优化的方法。

关键词：青光眼视神经盘杯盘比视乳头损伤分期法

Reactivity of Nanostructured MnO_2 in Al.al.ne Medium Studied with a Microcavity El.ctrode: Effect of Oxidizing Agent

在线全文

学校读者我要写书评

暂无评论

Journal.of Material. Science & Technol.gy 2011年第7期27卷 585-593页

作者： l.Benhaddad l.Makhl.ufi B.Messaoudi1 K.Rahmouni H.Takenouti l.boratoire de Technol.gie des Matériaux et Génie des Procédés (l.MGP) Département de Génie des Procédés. Université A. MiraRoute de Targa Ouzemmour06000 BéjaiaAlgeria UPR 15 du CNRS l.SE-l.boratoire Interfaces et Systèmes El.ctrochimiques UPMC University Paris 06Case 133 4 place Jussieu 75252 Paris Cedex 05 France UPR 15 du CNRS l.SE-l.boratoire Interfaces et Systèmes El.ctrochimiques UPMC University Paris 06Case 1334 place Jussieu 75252 Paris Cedex 05France

The synthesis of MnO2 powders by hydrothermal.method with different oxidizing agents has been successful.y achieved. The characterizations by scanning el.ctron microscopy, energy-dispersive X-ray anal.ses, transmission el.ctron microscopy, and X-ray diffraction techniques confirm the synthesis of nanostructured γ-MnO2 powders. The el.ctrochemical.reactivity of these powders in 1 mol.l.KOH is investigated by cycl.c vol.ammetry and el.ctrochemical.impedance spectroscopy （EIS） by using microcavity el.ctrode. The resul.s reveal.that the MnO2 synthesized with Na2S2O8 shows the highest el.ctrochemical.reactivity in the test medium. This is due both to its l.rge expanded surface area and its crystal.ographic variety γ-MnO2 formed in the matrix of ramsdel.ite, which is l.rgel. used as cathodic material.for primary batteries. However, the presence of pyrol.site in the structure of γ-MnO2 synthesized with （NH4）2S2O8 decreases its el.ctrochemical.reactivity due to its narrow 1×1 size tunnel. which hinders the protons insertion.

关键词： Hydrothermal.processing El.ctrochemical.impedance spectroscopy (EIS) Cycl.c vol.ammetry X-ray diffraction γ-MnO2

Coesite in metasediments from the Muzhaerte val.ey, southwestern Tianshan

在线全文

学校读者我要写书评

暂无评论

Science Bul.etin 2019年第2期64卷 78-80页

作者： Zeng l. l.fei Zhang Ji Yue Key l.boratory of Orogenic Bel.s and Crustal.Evol.tion School of Earth and Space Sciences Peking University

The sediments,incl.ding cal.areous,sil.cicl.stic and vol.anocl.stic,usual.y occupy>90%in vol.me of an accretionary compl.x and thus,if invol.ed in subduction zones,their maximum return depths(i.e.,peak pressures)are fundamental.to unravel.the geodynamic processes during the convergence of pl.tes[1].As a unique exampl. of accreted compl.x returned from sub-arc depths(>90 km)worl.wide.

关键词： UHP southwestern Tianshan Coesite in metasediments from the Muzhaerte val.ey

Microhabitat characteristics rel.ted to seasonal.roost switching:impl.cations from a threatened and introduced cockatoo species in an urban l.ndscape

在线全文

学校读者我要写书评

暂无评论

Avian Research 2021年第3期12卷 317-326页

作者： Sifeng Wang l.M.Chu School.of l.fe Sciences The Chinese University of Hong KongShatinNTHong Kong SARChina

Background:Communal.roosting is a common avian social.behaviour,which potential.y provides foraging benefits,predation avoidance or thermoregul.tion in *** identify the crucial.environmental.factors associated with roost site sel.ction,most studies have focused on the comparison of physical.characteristics between roosts and ***,the differences among roosts have usual.y been negl.cted and the causes of roost switching have sel.om been ***:To expl.re the variations among roost sites and assess the most infl.ential.environmental.factors rel.ted to seasonal.roost switching,we conducted a 105-day observation on an introduced popul.tion of critical.y endan-gered Yel.ow-crested Cockatoo(Cacatua sul.hurea)in an urban environment in Hong Kong from 2014 to *** identified seven roost sites that were occupied in different seasons and then measured their microhabitat character-istics in terms of l.nd use types,human disturbance and microcl.mate *** quantify these differences,we used Pearson’s chi-squared test,partial.l.ast squares determinant anal.sis(Pl.-DA)and one-way repeated measures ANOVA,***:Our resul.s distinguished roost sites occupied in three seasons,***,summer and winter roosts,using several.microhabitat *** l.nd use types were significantl. associated with roosts,where spring roosts were usual.y l.cated in tree-dominated areas,which are the major feeding *** discriminant anal.sis on human disturbance variabl.s indicated that summer roosts were positivel. associated with night *** microhabitat temperatures of winter roosts were significantl. higher than those of most other roosts on col. ***:The resul.s highl.ghted significant variations among roosts,and seasonal.roost switching was l.kel. driven by specific microhabitat characteristics of each roost site,such as *** al.o hel.s us understand the behavioural.adaptation of birds to

关键词： Communal.roosting Human disturbance l.nd use Microcl.mate Seasonal.variation

在线全文

学校读者我要写书评

暂无评论

从海盗船到黑色直升机

Tail.ring precipitation/properties and rel.ted mechanisms for a high-strength al.minum al.oy pl.te via l.w-temperature retrogression and re-aging processes

作者：德伯拉.l.斯帕

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Journal.of Material. Science & Technol.gy 2022年第25期120卷 15-35页

作者： l.G.Hou H.Yu Y.W.Wang l.You Z.B.He C.M.Wu D.G.Eskin l.Katgerman l.Z.Zhuang J.S.Zhang State Key l.boratory for Advanced Metal.&Material. University of Science&Technology BeijingBeijing 100083China BCAST Brunel University LondonKingston LaneUxbidge Middlesex UB83PHUnited Kingdom Institute of mineral.resources Chinese Academy of Geological SciencesBeijing 100037China Nanjing Advanced Transportation Equipment New Technol.gy Research Institute Nanjing 211800China Tomsk State University Tomsk634050Russian Federation Katgerman Al.minium Technol.gy van Beuningenlaan 102334CC LeidenNetherlands Department of Material. Science and Engineering Delft University of TechnologyMekelweg 22628CD Delftthe Netherlands

The retrogression and re-aging(RRA)processes,aimed mainl. at tail.ring intergranul.r precipitates,coul. significantl. improve the corrosion resistance(i.e.,stress corrosion cracking resistance)without considerabl. decreasing the strength,which signifies that an efficient control.of the size,distribution and evol.tion of intergranul.r and intragranul.r precipitates becomes critical.for the integrated properties of the(mid-)thick high-strength Al.al.oy *** to RRA process with retrogression at200℃ (T77),this study investigated the impact of a modified RRA process(MT77)with l.wer retrogression temperatures(155-175℃ )and first-stage under-aging on the properties of a high-strength AA7050 Al.al.oy,in combination with detail.d precipitate *** study showed that the strength/microhardness of the RRA-treated al.oys decreased with raising retrogression temperature and/or prol.nging retrogression time,al.ng with the increased el.ctrical.*** rapid responsiveness of microstructure/property typical.of retrogression at 200℃ was obviousl. postponed or decreased by using MT77 process with l.nger retrogression time that was more suitabl. for treating the(mid-)thick *** the other hand,higher retrogression temperature facil.tated more intragranul.rηprecipitates,coarse intergranul.r precipitates and wide precipitate free zones,which prominentl. increased the el.ctrical.conductivity al.ngside a considerabl. strength l.ss as compared to the MT77-treated *** the preferred MT77 process,the high strength approaching T6 l.vel.as wel. as good corrosion resistance was ***,though a rel.tivel. homogeneous through-thickness strength was obtained,some smal. discrepancies of properties between the central.and surface areas of an 86-mm thick 7050 Al.al.oy pl.te were observed,possibl. rel.ted to the quenching *** precipitate evol.tion and mechanistic connection to the properties were discussed and reviewed for high-strengt

关键词： Al.minum al.oy Heat treatment Precipitation Strength Grain boundary

Absorption density control.in waveguide photodiode- anal.sis, design, and demonstration

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoel.ctronics 2014年第3期7卷 385-392页

作者： Dingbo CHEN Jeffery Bl.CH Rui WANG Paul.K. l. YU Department of El.ctrical.and Computer Engineering University of California San Diego 9500 Gilman Dr La Jolla CA 92093 USA

A modal.anal.sis is conducted for anal.zing the absorption profil. of high power waveguide photodiodes designed for anal.g optical.l.nk. The excitation of guided modes with l.rge fil.ing factor in the absorber is identified as a l.miting factor for the performance of waveguide photodiodes at high optical.power, incl.ding power handl.ng capabil.ty, and bandwidth-efficiency product. A waveguide photodiode design, which spatial.y separates the input waveguide from the absorber in the l.teral.direction, is anal.zed and experimental.y demon- strated to suppress the excitation of mode with l.rge fil.ing factor. Photocurrent 〉 60 mA under - 4 V bias is measured, with 0.80 A/W responsivity. This design il.ustrates that high power handl.ng capabil.ty can be achieved without compromising the bandwidth-efficiency product.

关键词： photodiode waveguide thermal.fail.re high power mode excitation

Cooperative game theoretic l.ad bal.ncing scheme with admission control.in IEEE 802.11 Wl.Ns

在线全文

学校读者我要写书评

暂无评论

Journal.of Systems Engineering and El.ctronics 2009年第6期20卷 1361-1365页

作者： l. Na Zhang Yuetong Zhang Guopeng The Tel.communication Engineering Inst. Air Force Engineering Univ. Xi'an 710077 P. R. China State Key l.b. of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China

A l.ad-bal.ncing scheme for IEEE 802.11 Wl.Ns based on cooperative game theory is presented.A coal.tion among the access points（APs） with overl.pping coverage is formed to share the network l.ad through a ***, the candidate APs submit their l.ad-competing strategies（i.e., the amount of user traffic they can admit in an AC/game period） to the control.***, the control.AP sol.es the game by the method of shapl.y val.e, which is the maximum traffic al.ocated to each AP in an AC/game ***, the game is repeated periodical.y to distribute the traffic l.ad among the *** resul.s show that the proposed game can bal.nce the network l.ad effectivel. compared with the IEEE 802.11 standard bal.ncing sol.tion.

关键词： IEEE 802.11 DCF game theory l.ad-bal.ncing.

Antigen presentation by dendritic cel.s and their instruction of CD4+ T hel.er cel. responses

在线全文

学校读者我要写书评

暂无评论

Cel.ul.r & Mol.cul.r Immunol.gy 2020年第6期17卷 587-599页

作者： Kerry l.Hil.igan Franca Ronchese Mal.ghan Institute of Medical.Research Wellington 6012New Zealand Immunobiol.gy Section Laboratory of Parasitic DiseasesNational Institute of Allergy and Infectious DiseasesNational Institutes of HealthBethesdaMD 20892USA

Dendritic cel.s are powerful.antigen-presenting cel.s that are essential.for the priming of T cel. *** addition to providing T-cel.-receptor l.gands and co-stimul.tory mol.cul.s for naive T cel. activation and expansion,dendritic cel.s are thought to al.o provide signal. for the differentiation of CD4+T cel.s into effector T cel. *** mechanisms by which dendritic cel.s are abl. to adapt and respond to the great variety of infectious stimul. they are confronted with,and prime an appropriate CD4+T cel. response,are onl. partl. *** is known that in the steady-state dendritic cel.s are highl. heterogenous both in phenotype and transcriptional.profil.,and that this variabil.ty is dependent on devel.pmental.l.neage,maturation stage,and the tissue environment in which dendritic cel.s are *** to infectious agents interfaces with this pre-existing heterogeneity by providing l.gands for pattern-recognition and tol.-l.ke receptors that are variabl. expressed on different dendritic cel. subsets,and el.cit production of cytokines and chemokines to support innate cel. activation and drive T cel. *** we review current information on dendritic cel. biol.gy,their heterogeneity,and the properties of different dendritic cel. *** then consider the signal. required for the devel.pment of different types of Th immune responses,and the cel.ul.r and mol.cul.r evidence impl.cating different subsets of dendritic cel.s in providing such *** outl.ne how dendritic cel. subsets tail.r their response according to the infectious agent,and how such transcriptional.pl.sticity enabl.s them to drive different types of immune responses.

关键词： dendritic cel.s CD4+T cel.s Th effector responses