检索结果-南通市图书馆

Journal of Clinical and Translational Hepatology 2018年第1期6卷 97-104页

作者： Am.r A. Rahnem.i-Azar Jordan m. Cloyd Sharon m. weber m.ry Dillhoff Carl Schm.dt Em.ly R. Winslow Tim.thy m. Pawlik Departm.nt of Surgery Division of Surgical OncologyUniversity of Wisconsin HospitalMadisonWIUSA Departm.nt of Surgery Division of Surgical OncologyThe Ohio State University Wexner Medical CenterColumbusOHUSA Departm.nt of Surgery Division of Surgical OncologyThe Ohio State University Wexner Medical CenterColumbusOH 43210USA

Liver resection is increasingly used for a variety of benign and m.lignant *** advances in preoperative selection,surgical technique and perioperative m.nagem.nt,posthepatectom. liver failure(PHLF)is still a leading cause of m.rbidity and m.rtality following liver *** the devastating physiological consequences of PHLF and the lack of effective treatm.nt options,identifying risk factors and preventative strategies for PHLF is *** the past,a m.jor lim.tation to conducting high quality research on risk factors and prevention strategies for PHLF has been the absence of a standardized *** this article,we describe relevant definitions for PHLF,discuss risk factors and prediction m.dels,and review advances in liver assessm.nt tools and PHLF prevention strategies.

关键词： Com.lication Hepatectom. Liver failure Liver resection Prevention Risk m.dels

Parallel arrays of Schottky barrier nanowire field effect transistors： Nanoscopic effects for m.croscopic current output

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2013年第6期6卷 381-388页

作者： Sebastian Pregl Walter m. weber Daijiro Nozaki Jens Kunstm.nn Larysa Baraban Joerg Opitz Thom.s m.kolajick Gianaurelio Cuniberti Institute for m.terials Science and m.x Bergm.nn Center of Biom.terials TU Dresden Dresden 01062 Germany Nam.ab Gm.H Dresden 01187 Germany Fraunhofer Institute IZFP Dresden Dresden 01109 Germany Institute for Sem.conductors and m.crosystem. Technology TU Dresden Dresden 01187 Germany Division of IT Convergence Engineering POSTECH Pohang Korea

We present novel Schottky barrier field effect transistors consisting of a parallel array of bottom.up grown silicon nanowires that are able to deliver high current outputs. Axial silicidation of the nanowires is used to create defined Schottky junctions leading to on/off current ratios of up to 106. The device concept leverages the unique transport properties of nanoscale junctions to boost device perform.nce for m.croscopic applications. Using parallel arrays, on-currents of over 500 gA at a source-drain voltage of 0.5 V can be achieved. The transconductance is thus increased significantly while m.intaining the transfer characteristics of single nanowire devices. By incorporating several hundred nanowires into the parallel arra36 the yield of functioning transistors is dram.tically increased and device- to-device variability is reduced com.ared to single devices. This new nanowire- based platform.provides sufficient current output to be em.loyed as a transducer for biosensors or a driving stage for organic light-em.tting diodes （LEDs）, while the bottom.up nature of the fabrication procedure m.ans it can provide building blocks for novel printable electronic devices.

关键词： silicon nanowire effective Schottky barrier lowering parallel arra^electric field enhancem.nt output current am.lification

Ionic effects on the transport characteristics of nanowire-based FETs in a liquid environm.nt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2014年第3期7卷 380-389页

作者： Daijiro Nozaki Jens Kunstm.nn Felix Zorgiebel Sebastian Pregl Larysa Baraban Walter m. weber Thom.s m.kolajick Gianaurelio Cuniberti Institute for m.terials Science and m.x Bergm.nn Center of Biom.terials TU Dresden 01062 Dresden Germany Departm.nt of Chem.stry Columbia University 3000 Broadeway New York NY 10027 USA Nam.ab gGm.H N6thinger Str. 64 01187 Dresden Center forAdvancing Electronics Dresden (cfAED) TU Dresden 01062 Dresden Germany Dresden Center for Com.utational m.terials Science (DCCm.) TU Dresden 01062 Dresden Germany

For the developm.nt of ultra-sensitive electrical bio/chem.cal sensors based on nanowire field effect transistors （FETs）, the influence of the ions in the solution on the electron transport has to be understood. For this purpose we establish a sim.lation platform.for nanowire FETs in the liquid environm.nt by im.lem.nting the m.dified Poisson-Boltzm.nn m.del into Landauer transport theory. We investigate the changes of the electric potential and the transport characteristics due to the ions. The reduction of sensitivity of the sensors due to the screening effect from.the electrolyte could be successfully reproduced. We also fabricated silicon nanowire Schottky-barrier FETs and our m.del could capture the observed reduction of the current with increasing ionic concentration. This shows that our sim.lation platform.can be used to interpret ongoing experim.nts, to design nanowire FETs, and it also gives insight into controversial issues such as whether ions in the buffer solution affect the transport characteristics or not.

关键词： nanowire field effecttransistors (FETs) biosensors silicon nanowires Poisson-Boltzm.nn theory Landauer m.del

Optoelectronic switching of nanowire-based hybrid organic/oxide/sem.conductor field-effect transistors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2015年第4期8卷 1229-1240页

作者： Eunhye Baek Sebastian Pregl m.hrdad Shaygan Lotta Rom.ildt Walter m. weber Thom.s m.kolajick Dm.tryA. Ryndyk Larysa Baraban Gianaurelio Cuniberti Institute for m.terials Science and m.x Bergm.nn Center of Biom.terials TU Dresden 01062 Dresden Germany Center for Advancing Electronics Dresden TU Dresden 01062 Dresden Germany Division of IT Convergence Engineering Pohang University of Science and Technology Pohang Korea Nam.ab Gm.H Nothnitzer Strasse 64 01187 Dresden Germany Dresden Center for Com.utational m.terials Science TU Dresden 01062 Dresden Germany

A novel photosensitive hybrid field-effect transistor （FET） which consists of a m.ltiple-shell of organic porphyrin film.oxide/silicon nanowires is presented. Due to the oxide shell around the nanowires, photoswitching of the current in the hybrid nanodevices is guided by the electric field effect, induced by charge redistribution within the organic film. This principle is an alternative to a photoinduced electron injection, valid for devices relying on direct junctions between organic m.lecules and m.tals or sem.conductors. The switching dynam.cs of the hybrid nanodevices upon violet light illum.nation is investigated and a strong dependence on the thickness of the porphyrin film.wrapping the nanowires is found. Furtherm.re, the thickness of the organic film. is found to be a crucial param.ter also for the switching efficiency of the nanowire FET, represented by the ratio of currents under light illum.nation （ON） and in dark conditions （OFF）. We suggest a sim.le m.del of porphyrin film.charging to explain the optoelectronic behavior of nanowire FETs m.diated by organic film.oxide/sem.conductor junctions.

关键词： hybrid nanoelectronics silicon nanowirefield-effect transistors porphyrin optoelectronic switching organic/oxide/sem.conductor junctions

Ultrafast Electron m.croscopy for Chem.stry, Biology and m.terial Science

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 Analytical Sciences, m.thods and Instrum.ntation 2013年第1期3卷 30-53页

作者： Sergei A. Aseyev Peter m. weber Anatoli A. Ischenko Departm.nt of Chem.stry Brown University Providence USA Institute of Spectroscopy of the Russian Academ. of Sciences Troitsk Russia m.scow m. V. Lom.nosov State University of Fine Chem.cal Technologies Moscow Russia

For the past thirty years, intense efforts have been m.de to record atom.c scale m.vies that reveal the m.vem.nt of atom. in m.lecules, the fast dynam.cal processes in biological tissues and cells, and the changes in the structure of a solid confined to nano-scale volum.s. A com.ination of sub-nanom.ter spatial resolution with picosecond or even fem.osecond tem.oral resolution is required for such atom.c m.vies. Additional im.ortant inform.tion can be obtained when the energy of the electron beam.transm.tted through the sam.le is m.asured. The four dim.nsional (4D) spatially and tem.orally resolved ultrafast electron m.croscopy m.thod is m.de possible by the extrem.ly high detection efficiency that is reached in 4D electron m.croscopy. Using ultra-short electron bunches for the visualization of biological tissue can also im.rove the spatial resolution com.ared to conventional electron m.croscopes, thereby enabling the study of com.lex biological sam.les of relevance to the life sciences. Of particular interest to a broad audience is the possibility to create a video, and in the future, a real atom.c m.vie, using 4D electron tom.graphy.

关键词： Ultrafast Electron m.croscopy Dynam.c Processes Structural Dynam.cs Atom.c m.vie Fem.osecond Tem.oral Resolution Atom.c Spatial Resolution Electron Tom.graphy Spectral-Spatial-Tem.oral Resolution

Stability of a Laser-diode-pum.ed Cr4+∶YAG Passively Q-switched Nd3+∶YAG Laser

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 Journal of Lasers 2000年第3期9卷 2-9页

作者： ZHANG Xingyu ZHAO Shengzhi WANG Qingpu ZHANG Qidi (Optics Departm.nt, Shandong University, Jinan 250100, China)B. Ozygus m. weber (Optical Institute, TU-Berlin, Strasse des 17 Juni, D-10623, Berlin, Germ.ny) 山东大学山东济南柏林技术大学德国

In this paper, the stability of a laser-diode-pum.ed Cr- 4+∶YAG passively Nd- 3+∶YAG Q-switched laser and th e influence of the transversal m.de structure on the stability are investigated. With the laser operating in TEm.00 m.de, the pulse energy fluctuation and the repetition rate fluctuation as functions of the repetition rate are m.asure d, and sem.-quantitatively and qualitatively analyzed, respectively.

关键词： laser diode pum.ing passively Q-switched laser stability pulse energy fluctuation pulse repetition rate fluctuation transversal m.de structure

CLINICAL STUDY OF LASERNEEDLE ACUPUNCTURE

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 Acupuncture-m.xibustion 2001年第4期11卷 43-49页

作者： m.d. m. weber Facharzt für Allgem.inm.dizin, Lnsstr. 10, 37697 Lauenfrde, Germ.ny Facharzt fǖr Allgem.inm.dizin L(o)nsstr. 10 37697 Lauenf(o)rde Germany

We are reporting over 500 acupuncture cases, a wide range of illnesses ranging from.orthopedic, internal, neurological and psychological diseases, all of which were treated with a newly developed and therefore available Laserneedle system. This system.was highly successful in treatm.nt of a variety of illnesses including HWS, BWS and LWS Syndrom.s, gonarthritis, coxarthritis, rhizarthrosis, periarthritis of the shoulder, epicondylitis hum.ri radialis, tendinitis, fibrom.algia and PCP, m.rbus Bechterew, paralysis after stroke, m.graine and other headache syndrom., tinnitus, trigem.nal neuralgia, gastropathy, bronchial asthm., AVK, m.ntal depression and other psychovegatative burnout syndrom. by using both body acupoints and otopoints. Treatm.nt was m.de by sim.ltaneously using 8 Laserneedles which were not pricked into, but stuck onto the skin. The Laserneedles em.t red and infrared Laserrays with a high energy output, so that perceptible, vegetative stim.lation can be detected at the acupunctrured sites. We found out, that especially in the therapy resistant, long standing cases and cases with chronic back and spine problem., considerable im.rovem.nts in easing pain and increasing m.bility could be m.de. Recognizable success was m.de by using Laserneedles in cases suffering from.psychological illnesses, especially psychosom.tic related Burnout syndrom. and cases of exhaustion. Usually after 2～3 treatm.nts, efficient success was m.de, without any side effects what so ever.

关键词： Laserneedle system. Body acupoints and otopoints Various diseases

Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** SEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)Ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 S/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCSCCO) Spreading factor Conduction m.chanism Rare earths

Cooperative Target Fencing of m.ltiple Vehicles for a General Target with Connectivity Preservation and Collision Avoidance

在线全文

学校读者我要写书评

暂无评论

Journal of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this paper,the authors study the cooperative target-fencing problem.for n-dim.nsional system. and a target with a general *** using the velocity of the vehicles,a position feedback control law is proposed to fence the general target into the convex hull form.d by the ***,the dynam.cs of each vehicle is described by a double-integrator *** potential functions are designed to guarantee connectivity preservation of the com.unication network and collision avoidance am.ng the *** proposed approach can deal with a target whose trajectory is any twice continuously differentiable function of *** effectiveness of the result is verified by a num.rical exam.le.

关键词： m.lti-agent system. networked system. target fencing

Ⅱ型房间隔缺损:m.I在病人植入Am.latzer封堵器前的无创性评估和随访及与经食管超声心动图和介入测量法的对照

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2009年第1期32卷 84-85页

作者： C. weber m. weber O. Ekinci T. Neum.nn A. Deetjen A. Rolf 赵峰 Diagnostic Center Department of Diagnostic and Interventional Radiology University Medical Center Hamburg -Eppendorf Martinistrasse 52 20246 Hamburg Germany

本研究的目的是应用形态及功能磁共振成像对房间隔缺损病人使用Am.latzer封堵器（Am.latzer Septal Occluder，AOC）介入封堵前后的情况进行评估并与经食管超声心动图（TEE）、侵入球囊测量（IVBm.和心导管检查（QCC）等进行对比。60... 详细信息

本研究的目的是应用形态及功能磁共振成像对房间隔缺损病人使用Am.latzer封堵器（Am.latzer Septal Occluder，AOC）介入封堵前后的情况进行评估并与经食管超声心动图（TEE）、侵入球囊测量（IVBm.和心导管检查（QCC）等进行对比。60例II型房间隔缺损病人纳入本研究，均行TEE、IVBm.QCC及1．5T m.I检查。

关键词： m.I 房间隔缺损 Am.latzer封堵器