检索结果-南通市图书馆

A Cognitive Radio Receiver Supporting Wide-Band Sensing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insights into the hydrogen evolution reaction in vanadium redox flow batteries:A synchrotron radiation based X-ray imaging study

Wireless Sensor Network.无线传感网络） 2009年第3期

作者： Volk.r BLASCHk. Tobias RENk.friedrich k. jondral

来源：评论

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 132-144页

作者： k.rstin k.ble Alexey Ershov k.ngjun Duan Monja Schilling Alexander Rampf Angelica Cecilia TomášFaragó Marcus Zuber Tilo Baumbach Roswitha Zeis Helmholtz Institute Ulm Karlsruhe Institute of Technology89081 UlmGermany Laboratory for Applications of Synchrotron Radiation Karlsruhe Institute of Technology76131 KarlsruheGermany Institute for Photon Science and Synchrotron Radiation Karlsruhe Institute of Technology76344 Eggenstein-LeopoldshafenGermany Department of Electrical Electronicsand Communication EngineeringFaculty of EngineeringFriedrich-Alexander-Universität Erlangen-Nürnberg(FAU)91058 ErlangenGermany Department of Mechanical and Industrial Engineering University of TorontoToronto M5S 3G8OntarioCanada

The parasitic hydrogen evolution reaction(HER)in the negative half-cell of vanadium redox flow batteries(VRFBs)causes severe efficiency ***,a deeper understanding of this process and the accompanying bubble formation is *** benchmark.ng study locally analyzes the bubble distribution in thick.porous electrodes for the first time using deep learning-based image segmentation of synchrotron X-ray *** large three-dimensional data set was processed precisely in less than one minute while minimizing human errors and pointing out areas of increased HER activity in *** study systematically varies the electrode potential and material,concluding that more negative electrode potentials of-200 m V *** hydrogen electrode(RHE)and lower cause more substantial bubble formation,resulting in bubble fractions of around 15%–20%in carbon felt ***,the bubble fractions stay only around 2%in an electrode combining carbon felt and carbon *** detected areas with high HER activity,such as the border subregion with more than 30%bubble fraction in carbon felt electrodes,the cutting edges,and preferential spots in the electrode bulk.are potential-independent and suggest that larger electrodes with a higher bulk.to-border ratio might reduce HER-related performance *** described combination of electrochemical measurements,local X-ray microtomography,AI-based segmentation,and 3D morphometric analysis is a powerful and novel approach for local bubble analysis in three-dimensional porous electrodes,providing an essential toolk.t for a broad community work.ng on bubble-generating electrochemical systems.

关键词： Vanadium redox flow battery Synchrotron X-ray imaging Tomography Hydrogen evolution reaction Gas bubbles Deep learning

表面接枝改性纳米二氧化硅填充聚丙烯的结晶行为

在线全文

学校读者我要写书评

暂无评论

高分子学报 2004年第2期14卷 184-190页

作者：容敏智章明秋潘顺龙 friedrich k. 中山大学材料科学研究所聚合物复合材料及功能材料教育部重点实验室广州510275 Institute for Composite Materials (IVW) University of Kaiserslautern

应用差示扫描量热方法研究了纳米二氧化硅 (SiO2 )及其表面接枝改性对聚丙烯 (PP)结晶过程、等温与非等温结晶动力学的影响 ,并研究了上述等温结晶的熔融行为和平衡熔点 .研究发现纳米SiO2 具有明显的异相成核效应 ,能够提高PP的结晶温... 详细信息

应用差示扫描量热方法研究了纳米二氧化硅 (SiO2 )及其表面接枝改性对聚丙烯 (PP)结晶过程、等温与非等温结晶动力学的影响 ,并研究了上述等温结晶的熔融行为和平衡熔点 .研究发现纳米SiO2 具有明显的异相成核效应 ,能够提高PP的结晶温度、熔融温度、结晶度和结晶速率 ,但降低聚丙烯结晶的完善程度 .粒子的表面接枝处理 ,因改善了粒子与基体的亲和性而有利于粒子成核效应的提高。

关键词：聚丙烯表面接枝改性纳米二氧化硅结晶行为差示扫描量热法

Plant recruitment and survival as indicators of ecological restoration success in abandoned pasture land in Nurcoung,Victoria,Australia

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2013年第1期2卷 380-392页

作者： Singarayer k.Florentine Jessica Gardner friedrich P Graz Sean Moloney School of Science Information Technology and Engineering Federation University AustraliaP.O.Box 663Mt.Helen 3353VICAustralia Greening Australia NC2 Building62 Main StreetNatimuk 3409Australia Department of Land Management Polytechnic of Namibia13Storch Str.P/Bag 13388WindhoekNamibia Department of Botany James Cook University1James Cook DrTownsville CityQLD 4811Australia

Introduction:One of the major impediments to developing better restoration strategies is the inadequate documentation of past restoration *** 2008,Greening Australia commenced ecological restoration on the Nurcoung property in Victoria to enhance local biodiversity,and in this paper we report on the habitat restoration outcomes in the three Ecological Vegetation Classes(EVC)found on this ***:Permanent sample plots(12×20 m)were randomly established in July 2010 in each of the restoration areas,with 9,10,and 24 plots demarcated in Shallow Sands Woodland(SSW),Heathy Woodland(HW),and Sandstone Ridge Woodlands(SRW),*** plots were prepared to include three seeded *** were assessed for seedling recruitment and survival in May 2010,April 2011,and May *** of individual seedling development included their height and cover,and their location within the ***:Our study shows that interaction between the age of the planted and direct-seeded vegetation and the nature of the EVC significantly affects the composition of plants and the soil surface in that species and,further,that soil cover parameters develop in different ways in the different experimental plots.A SIMPER analysis of soil cover parameters shows that most of the variation over the years of restoration is attributable to differences in the amount of bare soil recorded,rather than the amount of leaf-litter cover,and that these changes in soil cover parameters differ between EVCs over the sampling *** direct-seeding study shows that whilst most of the broadcast species were recruited,some species used in the Shallow Sands Woodland,the Heathy Woodland,and the Sandstone Ridge Shrubland did not show evidence of recruitment during the three sampling *** the density of most seedlings increased in subsequent sampling years,the planted species Callitris gracilis,Callitris rhomboidea,Hak.a muelleriana,and Melaleuca lanceolata did not ***

关键词： soil planted seedling

Function and regulation of self-reactive marginal zone B cells in autoimmune arthritis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2015年第4期12卷 493-503页

作者： Anna-k.rin E Palm Heik. C friedrich Anja Mezger Maya Salomonsson Linda k.Myers Sandra k.einau Department of Cell and Molecular Biology Uppsala University Uppsala Sweden Department of Pediatrics University of Tennessee Health ScienceCenter Memphis TN USA

Polyreactive innate-type B cells account for many B cells expressing self-reactivity in the periphery. Improper regulation of these B cells may be an important factor that underlies autoimmune disease. Here we have explored the influence of self-reactive innate B cells in the development of collagen-induced arthritis （CIA）, a mouse model of rheumatoid arthritis. We show that splenic marginal zone （MZ）, but not B- 1 B cells exhibit spontaneous IgM reactivity to autologous collagen II in na＇=＇ve mice. Upon immunization with heterologous collagen II in complete Freund＇s adjuvant the collagen-reactive MZ B cells expanded rapidly, while the B-1 B cells showed a modest anti-collagen response. The MZ B cells were easily activated by toll-lik. receptor （TLR） 4 and 9-1igands in vitro, inducing proliferation and cytok.ne secretion, implying that dual engagement of the B-cell receptor and TLRs may promote the immune response to self-antigen. Furthermore, collagen-primed MZ B cells showed significant antigen-presenting capacity as reflected by cognate T-cell proliferation in vitroand induction of IgG anti-collagen antibodies in vivo. MZ B cells that were deficient in complement receptors I and 2 demonstrated increased proliferation and cytok.ne production, while Fcy receptor lib deficiency of the cells lead to increased cytok.ne production and antigen presentation. In conclusion, our data highlight self-reactive MZ B cells as initiators of the autoimmune response in CIA, where complement and Fc receptors are relevant in controlling the self-reactivity in the cells.

关键词： arthritis complement receptors Fc receptors marginal zone B cells, mice

Electron–plasmon and electron–magnon scattering in ferromagnets from first principles by combining GW and GT self-energies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 1619-1632页

作者： Dmitrii Nabok.Stefan Blügel Christoph friedrich Peter Grünberg Institut and Institut for Advanced Simulation Forschungszentrum JülichJülich 52425Germany

This work.combines two powerful self-energy techniques:the well-k.own GW method and a self-energy recently developed by us that describes renormalization effects caused by the scattering of electrons with magnons and Stoner *** GT selfenergy,which is fully k.dependent and contains infinitely many spin-flip ladder diagrams,was shown to have a profound impact on the electronic band structure of Fe,Co,and *** the present work.we refine the method by combining GT with the GW *** resulting GWT spectral functions exhibit strong lifetime effects and emergent dispersion *** are in an overall better agreement with experimental spectra than those obtained with GW or GT alone,even showing partial improvements over local-spin-density approximation dynamical mean-field *** performed analysis provides a basis for applying the GWT technique to a wider class of magnetic materials.

关键词： materials theory infinitely

Nonlinear waves of the Hirota and the Maxwell Bloch equations in nonlinear optics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第4期22卷 292-301页

作者：李传忠贺劲松 k. Porseizan Department of Mathematics Ningbo University Department of Physics Pondicherry University Institute of Condensed Matter Theory and Solid State Optics Friedrich-Schiller-Universitt Jena Max-Wein Platz 1 D-07743 Jena Germany

In this paper, considering the Hirota and the Maxwell–Bloch （H-MB） equations which are governed by femtosecond pulse propagation through a two-level doped fiber system, we construct the Darboux transformation of this system through a linear eigenvalue problem. Using this Daurboux transformation, we generate multi-soliton, positon, and breather solutions （both bright and dark.breathers） of the H-MB equations. Finally, we also construct the rogue wave solutions of the above system.

关键词： Hirota and Maxwell–Bloch equations nonlinear optics rogue wave

在线全文

学校读者我要写书评

暂无评论

高聚物塑性流动磨损机理研究

高分子材料科学与工程 1997年第4期13卷 90-94页

作者：章明秋 k.friedrich 中山大学材料科学研究所

选用聚醚醚酮（ＰＥＥＫ）为对象，研究其无润滑条件下的滑动摩擦磨损行为，根据实验测得的有关特性，磨屑形态及试样摩擦面特征，提出了塑性流动磨损机理，解释了实验现象。

关键词：聚醚醚酮摩擦磨损滑动摩擦塑性流动高聚物

Mineral and bone disorder and management in the China Dialysis Outcomes and Practice Patterns Study

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2019年第23期132卷 2775-2782页

作者： Jun Wang Brian A.Bieber Fan-Fan Hou friedrich k.Port Shuchi Anand National Clinical Research Center for k.dney Disease State Key Laboratory of Organ Failure ResearchDivision of NephrologyNanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515China Arbor Research Collaborative for Health Ann AborMlUSA Division of Nephrology Stanford University School of MedicinePalo AltoCAUSA

Back.round:Despite a growing population of patients starting hemodialysis in China,little is k.own about mark.rs of mineral bone disease(MBD)and their *** present data on prevalence and correlates of hypocalcemia,hyperphosphatemia,and secondary hyperparathyroidism from the China Dialysis Outcomes and Practice Patterns Study(DOPPS),with evaluation of whether these laboratory mark.rs triggered changes in ***:We compared the frequency of measurement and prevalence of poor control of MBD mark.rs in China DOPPS with other DOPPS *** also used generalized estimating equations to assess correlates of MBD mark.rs,and separate models to assess predictors of vitamin D and phosphate binder prescriptions in the China ***:Severe hyperphosphatemia(>7 mg/dL)and secondary hyperparathyroidism(>600 pg/mL)were common(27%and 21%prevalence,respectively);both were measured infrequently(14.9%and 3.2%of patients received monthly measurements in China).Frequency of dialysis sessions was positively associated with hyperphosphatemia;presence of residual k.dney function was negatively associated with both hyperphosphatemia and secondary *** measures indicating poor control of MBD were not associated with subsequent prescription of active vitamin D or phosphate ***:There are substantial opportunities for improvement and standardization of MBD management in *** of country-specific guidelines may yield realistic targets and standardization of medication use accounting for availability and cost.

关键词： Mineral bone disease Hyperphosphatemia Hyperparathyroidism China Hemodialysis Dialysis Outcomes and Practice Patterns Study