检索结果-南通市图书馆

Preliminary Application of.High-f.equency Ultrasound in the Dif.erentiation of.Pemphigus and Bullous Pemphigoid: An Observational Study

在线全文

学校读者我要写书评

暂无评论

International Journal of.Dermatology and Venereology 2024年第3期7卷 155-159页

作者： Liu Y.-A. Cao R. Da M.-H. Dong z.-B. Wang f. Department of.Dermatology Taizhou Central Hospital (Taizhou University Hospital) Zhejiang Taizhou 318000 China Department of.Dermatology Children's Hospital of Soochow University Jiangsu Suzhou 215025 China Department of.Dermatology Zhongda Hospital Southeast University Jiangsu Nanjing 210009 China

Objective: Ultrasonography is a diagnostic imaging technique used to visualiz. subcutaneous body structures f.r identif.cation of.possible pathologies. In this study, we aimed to explore the clinical signif.cance of.high-f.equency ultrasound in dif.erentiating the location of.blisters between pemphigus and bullous pemphigoid. Methods: Eighteen patients were recruited in Department of.Dermatology, z.ongda Hospital f.om 2020 to 2021 and divided into a pemphigus group (n = 8) and a bullous pemphigoid group (n = 10) according to the diagnostic criteria f.r each. Ultrasonographic images were collected using a 50-MHz.high-f.equency ultrasound system. The indexes of.ultrasonic evaluation were the layer (epidermis or dermis), siz., shape, internal echo, and boundary of.the blister. Categorical variables are expressed as n (%), and dif.erences were compared using f.sher's exact test. Results: The ultrasonographic images in the pemphigus group showed an intraepidermal semi-arc or irregular anechoic or hypoechoic areas. The inf.rior borders were situated above the characteristic thin linear hyperechoic bands of.the epidermis. A linear hypoechoic band was present at the dermoepidermal junction in some cases. In the ultrasonographic images of.the bullous pemphigoid group, the linear hyperechoic bands of.the epidermis were continuous and intact. An oval f.uid anechoic area (subepidermal blister) was present immediately below the bands. The location of.the blisters in the ultrasonographic images was signif.cantly dif.erent between the 2 groups (P f.equency ultrasound can be used as an auxiliary means to dif.erentiate the location of.blisters between pemphigus and bullous pemphigoid. © 2022 Hospital f.r Skin Diseases (Institute of.Dermatology), Chinese Academy of.Medical Sciences, and Chinese Medical Association, published by Wolters Kluwer, Inc.

关键词： bullous pemphigoid high-f.equency ultrasound pemphigus

Stability Investigation and Improvement f.r DC Cascade Systems with Simplif.ed Impedance-based Stability Criterion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of.Power and Energy Systems 2024年第3期10卷 1044-1052页

作者： Junbin fang z.ikang Shuai Yang Li z.ibing Wang Xiangyang Wu Xia Shen z.John Shen College of.Electrical and Inf.rmation Engineering Hunan UniversityChangsha 410082China Renewable Energy Department of.China Electric Power Research Institute Beijing 100192China Department of.Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA IEEE

In DC distributed power systems(DPSs),the complex impedance interactions possibly lead to DC bus voltage oscillation or *** previous research,the stability analysis of.DPSs is implemented based on mathematical analysis in control *** specif.c mechanisms of.the instability of.the cascade system have not been intuitively *** this paper,the stability analysis of.DPSs based on the traditional Nyquist criterion is simplif.ed to the resonance analysis of.the seriesconnected port impedance(z.R+jX)of.source and load *** reveals that the essential reason f.r impedance instability of.a DC cascade system is that the negative damping characteristic(Rf.the port the overall impedance amplif.es the internal resonance source at reactance z.ro-crossing *** simplif.ed stability criterion f.r DC cascade systems can be concluded as:in the negative damping f.equency ranges(Rz.ro-crossing point of.the reactance component(i.e.,X=0).According to the proposed stability criterion,the oscillation modes of.cascade systems are classif.ed.A typical one is the internal impedance instability excited by the negative damping,and the other one is that the external disturbance amplif.ed by negativity in a low stability ***,the impedance reshaping method f.r stability improvement of.the system can be f.rther *** validity of.the simplif.ed criterion is verif.ed theoretically and experimentally by a positive damping reshaping method.

关键词： DC cascaded system,impedance model impedance reconstruction stability criterion

Precipitation of.multi-type nano-quasicrystals in a Mg-z.-Y alloy

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.Magnesium and Alloys 2024年第3期12卷 997-1008页

作者： W.z.Wang X.z.z.ou L.f.z.ang H.Q.Ye z.Q.Yang Shenyang National Laboratory f.r Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua Laboratory Foshan 528251China f.shan University Foshan 528231China

Mg-6z.-1Y(at.%)ribbons with strengthening precipitates of.multi-type nanoquasicrystals were prepared by melt-spinning f.llowed by aging *** evolution of.the rapidly solidif.ed ribbons during isothermal aging was comprehensively studied using various electron microscopy *** new kinds of.decagonal quasicrystals were f.rmed in aged ribbons,in addition to precipitation of.nanometer icosahedral ***-resolution observations reveal that both decagonal quasicrystals can be modeled by quasiperiodic tiling with decagonal clusters of.2.5 nm in diameter,but overlap of.neighboring clusters in both decagonal quasicrystals is dif.erent f.om the Gummelt model observed in other quasicrystals.A shell composed of.complex Laves Mg-z. domains was f.rmed surrounding each decagonal quasicrystal precipitate upon prolonged *** addition,all kinds of.nanoprecipitates exhibit excellent structure and siz. stability at 573 *** f.ndings may have implications f.r not only f.ndamental studies about quasicrystals,but also microstructural manipulation of.high-perf.rmance Mg alloys.

关键词： Quasicrystal Mg alloys Rapid solidif.cation Scanning-transmission electron microscopy.

Construction of.2D/2D Ti_(3)C_(2)T_(x)MXene/CdS heterojunction with photothermal ef.ect f.r ef.icient photocatalytic hydrogen production

在线全文

学校读者我要写书评

暂无评论

Journal of.Materials Science & Technology 2024年第4期171卷 1-9页

作者： T.Y.Huang z.Yang S.Y.Yang z.H.Dai Y.J.Liu J.H.Liao G.Y.z.ong z.J.Xie Y.P.fang S.S.z.ang Key Laboratory f.r Biobased Materials and Energy of.Ministry of.Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of.Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of.Chemical Engineering and Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of.semiconductors to visible and inf.ared light is a key constraint on the utiliz.tion of.light energy in photocatalytic *** photocatalysts with f.ll-spectrum absorption through surf.ce engineering is an ef.ective approach to f.lly harnessing light energy in semiconductor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/CdS heterojunction catalyst is obtained by in-situ epitaxial growth of.two-dimensional(2D)CdS nanosheets on 2D MXene interf.ce via a solvothermal *** exceptional light absorption properties of.MXene conf.r outstanding f.ll-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure ef.ectively mitigated the recombination of.photogenerated carriers,enhancing the photocatalytic perf.rmance of.the ***,the composite catalyst exhibits a signif.cantly higher surf.ce temperature of.80.4℃under visible light irradiation at an intensity of.0.1 W/cm^(2),which is 1.84 times higher than that of.*** irradiation of.visible and near inf.ared light,the composite catalyst with photothermal ef.f.ct demonstrates a remarkable hydrogen evolution rate of.65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of.CdS *** study introduces a novel approach f.r constructing f.ll-spectrum absorption catalysts and expands the application of.the photothermal ef.ect in photocatalytic hydrogen evolution research.

关键词： Two-dimensional structure Heterostructure Photothermal ef.ect Photocatalyst Hydrogen evolution

In situ digital testing method f.r quality assessment of.sof. soil improvement with polyurethane

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.Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1732-1748页

作者： X.f.Wang C.J.Wang W.V.Yue z.J.z.ang z.Q.Yue Department of.Civil Engineering China University of Geosciences (Beijing)BeijingChina Department of.Water Science and Engineering Zhengzhou UniversityZhengzhouChina Department of.Geotechnical Engineering Tongji UniversityShanghaiChina Department of.Civil Engineering The University of Hong KongChina

This study purposes an in situ testing method on quality assessment of.soil *** drilling data includes the spatial distribution and in situ strength of.untreated and treated soil along three dif.erent drillholes measured by on-site drilling monitoring *** f.ctual drilling data can characteriz. the degree of.soil improvement by penetration injection with permeable *** f.om on-site drilling monitoring shows that the linear z.nes represent constant drilling speeds shown in the plot of.drill bit advancement *** drilling time,which indicates the spatial distributions of.soil *** soil prof.le at the study site is composed of.f.ur layers,which includes f.ll,untreated silty clay,treated silty clay,and mucky *** results of.soil prof.le are verif.ed by the parallel site *** constant drilling speeds prof.le the coring-resistant strength of.drilled *** comparing with the untreated silty clay,the constant drilling speeds of.the treated silty clay have been decreased by 13.0-62.8%.Two drilling-speed-based indices of.61.2%and 65.6%are proposed to assess the decreased average drilling speed and the increased in situ strength of.treated silty *** tests,*** compressive strength(UCS)test,have been perf.rmed with core sample to investigate and characteriz. in situ strength by comparing that with drilling *** show that the average predicted strengths of.treated silty clay are 2.4-6.9 times higher than the average measured strength of.untreated silty *** UCS-based indices of.374.5%and 344.2%verif.ed the quality assessment(QA)results by this new in situ *** method provides a cost-ef.ective tool f.r quality assessment of.soil improvement by utiliz.ng the digital drilling data.

关键词： Drilling process monitoring system Hydraulic rotary drilling process Constant drilling speed Soil improvement Quality assessment

Microstructure evolution and shape memory behaviors of.Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with dif.erent prestrain levels

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.Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.H.z.ang H.Li z.W.Yang X.Liu Q.f.Gu State Key Laboratory of.Solidif.cation Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of.High-Perf.rmance Precision f.rming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace f.eld due to its wide transf.rmation *** application of.shape memory ef.ect depends on multistep thermomechan-ical loading,viz.,low-temperature def.rmation and subsequent heating to ***-temperature def.rmation prestrain plays a pivotal role in shape memory properties tailoring of.SMA ***,microstructure evolution and def.rmation mechanisms of.Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of.Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with prestrain levels of.8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of.the specimen exhibits f.ur distinct stages at a maximal prestrain of.16%.Whereas stageⅡand stageⅢend at prestrains of.8%and∼12%,*** stageⅡ,the stress-induced martensitic transf.rmation is accompanied by the dislocation slip of.the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of.dislocations and f.rther growth of.stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of.the(001)def.rmation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,af.er subsequent unloading and heating,a higher density of.114}austenite twins f.rm in the specimen with a larger prestrain of.16%.With increasing prestrain f.om 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases f.rst and then ***ε_(re)^(T)obtains a maximum of.7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase of._(re)^(T)can be attributed to the f.rmation of.new SIMVs,the f.rther growth of.existing SIMVs,and the recoverable(001)compound *** the decrease of._(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** ef.e

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transf.rmation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transf.rmation Def.rmation twinning

f.-N-C core-shell catalysts with single low-spin f.(Ⅱ)-N_(4)species f.r oxygen reduction reaction and high-perf.rmance proton exchange membrane f.el cells

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.Energy Chemistry 2024年第6期93卷 538-546,I0013页

作者： Yan Wan Linhui Yu Bingxin Yang Caihong Li Chen fang Wei Guo fang-Xing Xiao Yangming Lin Xiamen Key Laboratory of.Rare Earth Photoelectric f.nctional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina CAS Key Laboratory of.Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021FujianChina f.jian Institute of.Research on the Structure of.Matter Chinese Academy of SciencesFuzhou 350002FujianChina College of.Materials Science and Engineering Fuzhou UniversityNew CampusMinhou 350108FujianChina College of.Chemistry and Materials Science Fujian Normal UniversityFuzhou 350117FujianChina

f.-N-doped carbon materials(f.-N-C)are promising candidates f.r oxygen reduction reaction(ORR)relative to Pt-based catalysts in proton exchange membrane f.el cells(PEMf.s).However,the intrinsic contributions of.f.-N_(4)moiety with dif.erent chemical/spin states(e.g.D1,D2,D3)to ORR are unclear since various states coexist *** the present work,f.-N-C core-shell nanocatalyst with single lowspin f.(Ⅱ)-N_(4)species(D1)is synthesiz.d and identif.ed with ex-situ ultralow temperature Mossbauer spectroscopy(T=1.6 K)that could essentially dif.erentiate various f.-N_(4)states and invisible f.-O *** quantif.ing with CO-pulse chemisorption,site density and turnover f.equency of.f.-N-C catalysts reach 2.4×10^(-9)site g^(-1)and 23 e site~(-1)s^(-1)during the ORR,***-wave potential(0.915V_(RHE))of.the f.-N-C catalyst is more positive(approximately 54 mV)than that of.Pt/***,we observe that the perf.rmance of.PEMf.s on f.-N-C almost achieves the 2025 target of.the US Department of.Energy by demonstrating a current density of.1.037 A cm^(-2)combined with the peak power density of.0,685 W cm^(-2),suggesting the critical role of.f.(Ⅱ)-N_(4)site(D1).Af.er 500 h of.running,PEMf.s still deliver a power density of.1.26 W cm^(-2)at 1.0 bar H_(2)-O_(2),An unexpected rate-determining step is f.gured out by isotopic labelling experiment and theoretical *** work not only of.ers valuable insights regarding the intrinsic contribution of.f.-N_(4)with a single spin state to alkaline/acidic ORR,but also provides great opportunities f.r developing high-perf.rmance stable PEMf.s.

关键词： f.el cells Oxygen reduction reaction Non-platinum group metals(PGMs) Isotopic labelling Active site TOf

Suf.icient Conditions f.r Amalgamated 3-Manif.lds to be ∂-Irreducible

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of.Mathematics,Series B 2024年第2期45卷 161-172页

作者： Bing fang f.ngchun LEI Liang LIANG School of.Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina School of.Mathematics Liaoning Normal UniversityDalian 116029LiaoningChina

In this paper,the authors give some suf.icient conditions f.r an amalgamated 3-manif.ld along a compact connected surf.ce f.with boundary to be ∂-irreducible in terms of.distances between some kinds of.vertex subsets ... 详细信息

关键词： ∂-Irreducibility Irreducibility Amalgamated 3-manif.ld Curve complex Arc complex

Rescattering of.stimulated Raman side scattering in nonunif.rm plasmas

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： S.Tan Q.Wang Y.Chen W.B.Yao C.z.Xiao J.f.Myatt School of.Physics and Electronics Hunan UniversityChangsha 410082China Institute of.Applied Physics and Computational Mathematics Beijing 100094China School of.Electrical and Inf.rmation Engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of.Electrical and Computer Engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Rescattering of.stimulated Raman side scattering(SRSS)is observed f.r the f.rst time via two-dimensional(2D)particle-in-cell(PIC)*** construct a theoretical model f.r the rescattering process,which can predict the region of.occurrence of.mth-order SRSS and estimate its *** rescattering process is identif.ed by the 2D PIC simulations under typical conditions of.a direct-drive inertial conf.nement f.sion *** electrons produced by second-order SRSS propagate nearly perpendicular to the density gradient and gain nearly the same energy as in f.rst-order SRSS,but there is no cascade acceleration to produce superhot *** studies f.r a wide range of.ignition conditions show that SRSS and associated rescatterings are robust and important processes in inertial conf.nement f.sion.

关键词： nonunif.rm acceleration scattering