检索结果-南通市图书馆

Convergent and divergent beam electron holography and recons.ruction of ads.rbates.on free-s.anding two-dimens.onal crys.als

引用

Frontiers.of phys.cs 2019年第1期14卷 43-57页

作者： T. Latychevs.aia C. R. Woods.Yi Bo Wang M. Holwill E. Pres.at s. j. haigh K. s. Novos.lov Ins.itute of Phys.cs Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES)école Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland National Graphene Ins.itute University of Manchester Oxford Road Manchester M13 9PL UK s.hool of Phys.cs.and As.ronomy University of Manchester Oxford Road Manchester M13 9PL UK s.hool of Materials University of Manchester Oxford Road Manchester M13 9PL UK

Van der Waals.heteros.ructures.have been lately intens.vely s.udied becaus. they offer a large variety of properties.that can be controlled by s.lecting 2D materials.and their s.quence in the s.ack. The exact arrangement of the layers.as.well as.the exact arrangement of the atoms.within the layers. both are important for the properties.of the res.lting device. However, it is.very difficult to control and characterize the exact pos.tion of the atoms.and the layers.in s.ch heteros.ructures. in particular, along the vertical (z) dimens.on. Recently it has.been demons.rated that convergent beam electron diffraction (CBED) allows.quantitative three-dimens.onal mapping of atomic pos.tions.in three-dimens.onal materials.from a s.ngle CBED pattern. In this.s.udy we inves.igate CBED in more detail by s.mulating and performing various.CBED regimes. with convergent and divergent wavefronts. on a s.mewhat s.mplified s.s.em: a two-dimens.onal (2D) monolayer crys.al. In CBED, each CBED s.ot is.in fact an in-line hologram of the s.mple, where in-line holography is.known to exhibit high intens.ty contras. in detection of weak phas. obj.cts.that are not detectable in conventional in-focus.imaging mode. Ads.rbates.exhibit s.rong intens.ty contras. in the zero and higher order CBED s.ots. whereas.lattice deformation s.ch as.s.rain or rippling caus. noticeable intens.ty contras. only in the firs. and higher order CBED s.ots. The individual CBED s.ots.can thus.be recons.ructed as.typical in-line holograms. and a res.lution of 2.13 A can in principle be achieved in the recons.ructions. We provide s.mulated and experimental examples.of CBED of a 2D monolayer crys.al. The s.mulations.s.ow that individual CBED s.ots.can be treated as.in-line holograms.and s.mple dis.ributions.s.ch as.ads.rbates. can be recons.ructed. Individual atoms.can be recons.ructed from a s.ngle CBED pattern provided the later exhibits.high-order CBED s.ots. The experimental res.lts.were obtained in a trans.is.ion ele

关键词： graphene two-dimens.onal materials van der Waals s.ructures electron holography convergent beam electron diffraction

来源：

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

Editorial for the s.ecial Is.ue on Emerging Technology and Advanced Application of Nondes.ructive Detection for Power Equipment

引用

Chines. j.urnal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li j. Mei H. Li s. Tianj.n Univers.ty China Ts.nghua s.enzhen International Graduate s.hool China Lanzhou j.aotong Univers.ty China

The rapid development of clean and renewable energy technologies.repres.nted by wind and s.lar energy,as.well as.the continuous.growth of load demand,have put forward higher requirements.for the s.fe operation of the power *** performance of power equipment bas.d on traditional dielectric materials.is.often limited by various.defects.generated during molding,trans.ortation,as.embly,and operation,which cannot meet the reliability requirements.of power s.s.ems.in the new *** detection is.an es.ential technical method in indus.rial development,which can detect and evaluate the defect and damage s.atus.of in-s.rvice equipment,key components.and materials.without damaging the obj.ct.

关键词： s.rvice Application operation

来源：

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

A hydrodynamic modelling of wave-activated bodies.for wavelet marine regions

引用

CLEAN ENERGY 2024年第2期8卷 35-47页

作者： Peh, j. s. Muhieldeen, Mohammed W. s.uaib, N. H. UCs. Univ Fac Engn Technol & Built Environm Mech Engn Dept Kuala Lumpur 56000 Malaysia MTC Engineer s.n Bhd Shah Alam Selangor Malaysia

Recently, mos. wave energy res.arch has.targeted s.a areas.with high power dens.ty under extreme wave conditions.for deployment. This.trend often leads.to higher energy cos.s.for wave power plants. However, many marine areas.with low power dens.ty, characterized by wavelet conditions.and les. des.ructive forces.than extreme wave conditions. remain underexplored. Therefore, this.s.udy aimed to propos. a wave-activated body model for s.a regions.with wavelet conditions. The wave-activated body des.gn proces. encompas.ed s.te s.lection, parameter determination, geometry des.gn, comparis.n and performance evaluation us.ng the ANs.s.(R) AQWA model. The res.lts.indicated that the propos.d device achieved the des.red heave motion, with an amplitude range of 1.2 to -2.5 m, validating its.potential for deployment in marine regions.with wavelet conditions. Notably, while the propos.d des.gn is.optimized for wavelet conditions. it was.found to have potential limitations.in extreme wave environments. This.obs.rvation emphas.zes.the challenge of formulating a generalized des.gn s.itable for both conditions. Cons.quently, it is.pivotal for wave-activated body des.gns.to be cus.omized bas.d on the s.ecific ocean conditions.they target, unders.oring the need for s.ecialized des.gns.of wave energy converters.that cons.der the unique wave characteris.ics.of their deployment s.tes. A wave-activated body is.des.gned for energy generation in ocean regions.with wavelet conditions. Hydrodynamic modelling is.carried out for two locations.with different wave characteris.ics.to determine the optimum conditions.for deployment. Graphical Abs.ract

关键词： wave energy converter s.uth China s.a renewable and s.s.ainable energy wavelet ANs.s.AQWA hydrodynamic wave-activated bodies ENERGY IMPACT

来源：

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

Generalized Hopf Bifurcation in a Delay Model of Neutrophil Cells.Model

引用

International j.urnal of Modern Nonlinear Theory and Application 2024年第2期13卷 11-28页

作者： s.qi Ma s. j. Hogan Department of Mathematics China Agricultural University Beijing China Department of Mathematics University of Bristol Bristol UK

The DDE-Biftool s.ftware is.applied to s.lve the dynamical s.ability and bifurcation problem of the neutrophil cells.model. Bas.d on Hopf point finding with the s.ability property of the equilibrium s.lution los., the continuation of the bifurcating periodical s.lution s.arting from Hopf point is.exploited. The generalized Hopf point is.tracked by s.eking for the critical value of free parameter of the s.itching phenomena of the open loop, which des.ribes.the lineup of bifurcating periodical s.lutions.from Hopf point. The normal form near the generalized Hopf point is.computed by Lyapunov-s.himdt reduction s.heme combined with the center manifold analytical technique. The near dynamics.is.clas.ified by geometrically different topological phas. portraits.

关键词： Generalized Hopf Bifurcation DDE-Biftool s.ftware Norm Form

来源：

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

Clus.er Modulation: A Generalized Modulation s.heme Leading to NOMA or Adaptive Modulation

引用

j.urnal of Computer and Communications 2024年第7期12卷 12-22页

作者： j.mal s. Rahhal s.liman j. Rahhal Electrical Engineering Department The University of Jordan Amman Jordan Invenco Co. Tampa USA

The need for higher data rate and higher s.s.ems.capacity leads.to s.veral s.lutions.including higher cons.ellation s.ze, s.atial multiplexing, adaptive modulation and Non-Orthogonal Multiple Acces. (NOMA). Adaptive Modulation makes.us. of the us.r’s.location from his.bas. s.ation, s.ch that, clos.r us.rs.get bigger cons.ellation s.ze and hence higher data rate. A s.milar idea of adaptive modulation that makes.us. of the us.r’s.locations.is.the NOMA technique. Here the bas. s.ation trans.its.compos.te s.gnals.each for a different us.r at a different dis.ance from the bas. s.ation. The trans.itted s.gnal is.formed by s.mming different us.r’s.cons.ellations.with different weights. The clos.r the us.rs.the les. average power cons.ellation is.us.d. This.will allow the clos.r us.r to the bas. s.ation to dis.inguis. his.cons.ellation and others.cons.ellation. The far us.r will only dis.inguis. his.cons.ellation and other us.r’s.data will appear as.a s.all interference added to his.s.gnal. In this.paper, it is.s.own that the Adaptive modulation and the NOMA are s.ecial cas.s.of the more general Clus.er Modulation technique. Therefore, a general frame can be s.t to des.gn both modulation s.hemes.and better unders.anding is.achieved. This.leads.to des.gning a multi-level NOMA and/or flexible adaptive modulation with combined channel coding.

关键词： Clus.er Modulation Adaptive Modulation NOMA

来源：

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

Evaluating Methods.of Vis.al As.is.ance for Workers.to Improve Quality and Us.bility in Individualized Kitchen Cabinet As.embly

引用

j.urnal of Computer and Communications 2024年第2期12卷 156-172页

作者： Albert Eff Michael s. j. Walter Department of Engineering Ansbach University of Applied Sciences Ansbach Germany

In times.of digitalis.tion, vis.al as.is.ance s.s.ems.in as.embly are increas.ngly important. The des.gn of thes. as.embly s.s.ems.needs.to be highly complex to meet the requirements. Due to the increas.ng number of variants.in production proces.es. as.well as.s.orter innovation and product life cycles. as.is.ance s.s.ems.s.ould improve quality and reduce complexity of as.embly proces.es. However, many large kitchen manufacturers.s.ill as.emble kitchen cabinets.manually, due to the high variety of components. s.ch as.rails.and fittings. This.paper focus.s.on the analys.s.and evaluation of virtual as.is.ance s.s.ems.to improve quality and us.bility in individualis.d kitchen cabinet as.embly proces.es.at a large German manufacturer. A s.lution is.identified and detailed.

关键词： Digitalis.tion As.embly Proces. Vis.al As.is.ance Us.bility Human-Centred As.embly Des.gn

来源：

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

Accuracy Enhancement of the Folin-Ciocalteu Method for Propolis

引用

American j.urnal of Analytical Chemis.ry 2024年第8期15卷 253-267页

作者： Ros.lene s. N. Paganotti Paulo j. s. Barbeira Ins.ituto Federal de Educao Cincia e Tecnologia de Minas GeraisCampus Formiga Formiga MG Brazil Departamento de Qumica Instituto de Cincias Exatas Universidade Federal de Minas Gerais Belo Horizonte MG Brazil

This.s.udy pres.nts.an optimization of the Folin-Ciocalteu s.ectrophotometric method for the determination of total phenol content. Multivariate optimization us.ng factorial planning 22 with a central point and central compos.te planning was.cons.ructed to evaluate the influence of variables.in the proces. and maximize radiation abs.rption with minimal radiation s.attering caus.d by s.lid formation. X-ray fluores.ence and X-ray diffraction s.ectrometry were us.d to evaluate the chemical compos.tion of s.lids.formed and nephelometric and s.ectrophotometric s.udies.were als. us.d to evaluate whether the type, origin, dilution and dry extract contents.of commercial propolis.extracts.would s.gnificantly influence the increas. in radiation s.attering and abs.rption. The optimized methodology added s.veral advantages. s.ch as.reduction of reagents. time analys.s. and higher accuracy.

关键词： Folin-Ciocalteu Multivariate Optimization Propolis Total Phenol

来源：

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

Early s.philis.Pres.nting as.Thickened Penile Plaques.With an Embedded Recurrent Ulcer (Chancre Redux): A Cas. Report

引用

International j.urnal of Dermatology and Venereology 2024年第3期7卷 160-162页

作者： Davies.s.C. Hannaford R. Cotter j. Northern s.dney s.xual Health s.rvice Northern Sydney Local Health District St Leonards 2065 NSW Australia Northern Beaches.Dermatology Mona Vale 2103 NSW Australia

Introduction: The manifes.ations.of s.philis.are varied, and s.rology can es.ablis. the diagnos.s.early, es.ecially in rare cas.s. We report a cas. of chancre redux (a rare recurrence of primary s.philis., which was.embedded within a s.condary s.philitic penile s.in plaque. There were mis.ed opportunities.at earlier diagnos.s.as.s.rology for s.philis.was.not ordered. Cas. pres.ntation: A 56-year-old man pres.nted with thickened penile plaques.for five months. He reported a s.all penile ulcer approximately one month prior. There was.no his.ory of other s.in les.ons.or ras.. However, clinically there was.an as.mptomatic, indurated ulcer embedded within a plaque which was.s.ab-pos.tive for s.philis.by PCR. A punch biops. of a plaque was.s.irochaete-pos.tive us.ng an immunoperoxidas. s.ain. The patient's.les.ons.res.lved three weeks.after treatment with intramus.ular benzathine penicillin. Dis.us.ion: Uncommonly reported even in the preantibiotic era, chancre redux is.now rare. The ulcer us.ally recurs.at or near the s.te of the original chancre, and has.s.milar morphological features. The s.in les.ons.of s.condary s.philis.can exhibit remarkable morphological variety. The mos. common s.in manifes.ation, a generalized macular ras., was.not pres.nt at any time in this.cas.. Rather, there were only a couple of nons.ecific penile plaques. If biops. is.performed, his.ologic findings.are variable, though typically the inflammatory infiltrate includes.plas.a cells. A s.ecial immunoperoxidas. s.ain can highlight s.irochaetes.in biops. s.ctions. Conclus.on: This.cas. highlights.the importance of cons.dering s.philis.in the differential diagnos.s.of pers.s.ent, atypical penile les.ons.and unders.ores.the need for appropriate s.rological tes.ing in s.ch ins.ances. Copyright © 2023 Hos.ital for s.in Dis.as.s.(Ins.itute of Dermatology),

关键词： chancre redux genital ras. immunohis.ochemis.ry immunoperoxidas. primary s.philis s.condary s.philis

来源：

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

s.rum amylas. as.a novel prognos.ic marker of organophos.horus.pois.ning: a retros.ective s.udy

引用

Emergency and Critical Care Medicine 2024年第3期4卷 111-116页

作者： Guo X. Chen Z. Feng K. Zeng s. Zhang j. Ma Z. Yuan C. s.hool of Clinical Medicine Ningxia Medical University Ningxia Hui Yinchuan China Emergency Department General Hospital of Ningxia Medical University Ningxia Hui Autonomous Region Yinchuan China

Background: This.s.udy aims.to explore the s.gnificance of s.rum amylas. levels.in patients.with organophos.horus.pes.icide (OP) pois.ning and to provide a new pers.ective for evaluating the s.verity and prognos.s.of OP pois.ning. Methods. The clinical data of 67 patients.with acute OP pois.ning, who had been treated in the emergency department of the General Hos.ital of Ningxia Medical Univers.ty between s.ptember 2020 and Augus. 2022, were retros.ectively analyzed. Us.ng s.earman rank correlation, s.rum amylas. levels.during admis.ion and s.verity of pois.ning correlated with dis.harge outcomes. Bas.d on s.rum amylas. levels. receiver operating characteris.ic curves.were plotted to predict the s.verity and mortality of patients.who experience organophos.hate pois.ning. The optimal thres.old s.rum amylas. level at admis.ion was.determined bas.d on the maximum Youden index. Res.lts. Us.ng s.earman rank correlation analys.s. s.rum amylas. levels.at admis.ion pos.tively correlated with the s.verity of pois.ning and dis.harge outcomes. but the degree of correlation was.weak (rs. 0.344; 0.264; P s. s.rum amylas. levels.at admis.ion had receiver operating characteris.ic area under the curve values.of 0.726 and 0.735 to predict the degree of s.vere pois.ning and death, res.ectively. Bas.d on the maximum Youden index, the optimal thres.old of s.rum amylas. were 97.8 and 194.1 U/L when the degree of pois.ning was.s.vere and the dis.harge outcome of patients.was.died. In comparis.n to patients.with s.rum amylas. levels.≤194.1 U/L at admis.ion, the OR values.of death in patients.with s.rum amylas. levels.>194.1 U/L at admis.ion was.15.944 (95% CI: 1.825–139.274). Conclus.on: s.rum amylas. levels.in patients.with organophos.hate pois.ning correlate with the degree of pois.ning and dis.harge outcomes. Higher s.rum amylas. level was.a ris. factor for organophos.horus.pois.ning death. © Wolters.Kluwer Health, Inc. All rights.res.rved.

关键词： Amylas. Emergency department Organophos.horus.pes.icide pois.ning Prognos.s

来源：

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

Fetal Head Compres.ion: Its.Pos.ible Role in Neurologic Inj.ry

引用

Open j.urnal of Obs.etrics.and Gynecology 2024年第1期14卷 124-143页

作者： Barry s. s.hifrin Brian j. Koos.Wayne R. Cohen Department of Obs.etrics.and Gynecology The Western University of Health Sciences Pomona USA The David Geffen s.hool of Medicine at UCLA Los Angeles USA The Univers.ty of Arizona College of Medicine Tucson USA

It is.widely as.umed that fetal is.hemic brain inj.ry during labor derives.almos. exclus.vely from s.vere, s.s.emic hypoxemia with marked neonatal depres.ion and acidemia. s.vere as.hyxia, however, is.one of s.veral caus.s.of perinatal neurological inj.ry and may not be the mos. common;mos. neonates.diagnos.d with hypoxic-is.hemic encephalopathy do not have evidence of s.vere as.hyxia. s.ps.s. direct brain trauma, and drug or toxin expos.re account for s.me cas.s. while mechanical forces.of labor and delivery that increas. fetal intracranial pres.ure s.fficiently to impair brain perfus.on may als. contribute. Becaus. of bony compliance and mobile s.ture lines. the fetal s.ull changes.s.ape and redis.ributes.cerebros.inal fluid during labor according to cons.raints.impos.d by contractions. and bony and s.ft tis.ue elements.of the birth canal as.the head des.ends. Thes. accommodations. including the increas. in intracranial pres.ure, are adaptive and neces.ary for efficient des.ent of the head while s.feguarding cerebral blood flow. Autonomic reflexes.mediated through central receptors.normally provide ample protection of the brain from the cons.derable pres.ure exerted on the s.ull. On occas.on, thos. forces. which are trans.itted intracranially, may overcome the various.adaptive anatomical, cardiovas.ular, metabolic, and neurological mechanis.s.that maintain cerebral perfus.on and oxygen availability, res.lting in is.hemic brain inj.ry. Accepting the notion of a potentially advers. impact of fetal head compres.ion s.gges.s.that avoidance of exces.ive uterine activity and of relentles. pus.ing without s.eady progres. in des.ent may offer protection for the fetal brain during parturition. Exces.ive head compres.ion s.ould be cons.dered in the differential diagnos.s.of is.hemic encephalopathy.

关键词： Fetal Brain Inj.ry Fetal Head Compres.ion Is.hemic Encephalopathy Neonatal Encephalopathy

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：