检索结果-南通市图书馆

国际医学放射学杂志 2021年第2期44卷 241-241页

作者： D.Hernando R.J.cook N.Qazi c.A.Longhurst c.a.diamond S.B.Reeder 王萱

摘要目的基于MRI的R2*mapping可以可靠、快速地定量肝脏铁浓度（LIc）。然而,R2*在不同采集协议中的表现和可重复性仍然未知。因此,本研究旨在评估复合混杂因素

关键词：

Properties of SN Ia progenitors from light curves and spectra

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2013年第2期8卷 144-167页

作者： P. Hoflich P. Dragulin J. Mitchell B. Sadler T. diamond c. Gerardy Department of Physics Florida State University Talahassee USA FL 32306 Department of Physics Astronomy Clemson University Clemson USA SC 29634

With recent advances in theory and observations, direct connections emerge between the progenitors of Type Ia Supernovae （SNe Ia） and the observed light curves and spectra. A direct link is important for our understanding of the supernovae physics, the diversity of SNe Ia and the use of SNe Ia for high-precision cosmology because the details of the explosion depends sensitively on the initial conditions and the explosion scenario（s） realized in nature. Do SNe Ia originate from SD- or DD systems, and do they lead to Mcu mass explosions or dynamical mergers？ Does the statistical distribtion of SNe Ia depend on their environment which can be expected to change with redshift？ In this contribution, we will exam from the theoretical point of view the tell-tails for this connection, their consistency with the observations, and future directions. In a first section, we present the physics of the explosion, light curves and spectral formation in a nutshell to help understanding the connection. For details of the progenitor evolution and explosion physics, we refer to reviews and the other contributions in this issue. Each of the topical sections starts with a brief general review followed by a more detailed discussion of specific results. Because the youth of the field, some bias is unavoidable towards results obtained within our collaborations （and FSU）. The imprint of the metallicity, progenitor stars and properties such as the central density of the exploding WD are presented. IR spectroscopy, polarimetry and imaging of SNR remnants are discussed as a tool to test for the WD properties, magnetic fields and asymmetries. We discuss different classes of Type Ia supernovae, and their environment. Possible correlations between the spectroscopic and light curve properties of SN Ia are discussed. Finally, the overall emerging picture and future developments are discussed.

关键词： supernovae: general progenitors light curves spectra

Temperature and structure measurements of heavy-ion-heated diamond using in situ X-ray diagnostics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第4期9卷 80-89页

作者： J.Lutgert P.Hesselbach M.Schorner V.Bagnoud R.Belikov P.Drechsel B.Heuser O.SHumphries P.Katrik B.Lindqvist c.Qu R.Redmer D.Riley G.Schaumann S.Schumacher A.Tauschwitz D.Varentsov K.Weyrich X.Yu B.Zielbauer Zs.Major P.Neumayer D.Kraus Institut fur Physik Universitat RostockAlbert-Einstein-Str.2318059 RostockGermany GSI Helmholtzzentrum fur Schwerionenforschung Planckstr.164291 DarmstadtGermany Institut für Angewandte Physik Goethe-Universität Frankfurt am MainMax-von-Laue-Str.160438 Frankfurt am MainGermany Institut fur Geowissenschaften Goethe-Universitat Frankfurt am MainAltenhoferallee 160438 Frankfurt am MainGermany Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstr.40001328 DresdenGermany European XFEL GmbH Holzkoppel 422869 SchenefeldGermany centre for Plasma Physics School of Mathematics and PhysicsQueen’s University BelfastUniversity RoadBelfast BT71NNUnited Kingdom Institut für Kernphysik Technische Universität DarmstadtSchlossgartenstr.964289 DarmstadtGermany State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking UniversityBeijing 100871China Helmholtz Institut Jena Frobelstieg 307743 JenaGermany

We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of heavy *** this way,we determine the samples’heating dynamics and their microscopic and macroscopic structuralintegrity over a timespan of several *** the ratio of elastic to inelastic scattering with state-of-the-art density functionaltheory molecular dynamics simulations allows the inference of average temperatures around 1300 K,in agreement with predictions fromstopping power *** simultaneous diffraction measurements show no hints of any volumetric graphitization of the material,butdo indicate the onset of fracture in the diamond *** experiments pave the way for future studies at the Facility for Antiproton andIon Research,where a substantially increased intensity of the heavy ion beam will be available.

关键词： heated intense structure

A History of the Urban Underground Tunnel (4000 B.c.E. - 1900 c.E.)

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 Transportation Technologies 2018年第1期8卷 11-43页

作者： Robert Steven diamond Brian Garret Kassel Brooklyn Historic Railway Association Columbia University New York NY USA

Generally hidden from public view, out of our daily thoughts, and literally under our feet, are myriad urban underground tunnels that make our modern megacities possible. From their ancient beginnings in antiquity, as a means of supplying fresh water and draining waste water from cities, underground tunnels evolved into a means of providing high capacity rail mass transit in our most densely populated urban centers. This paper provides a broad overview of the evolution of urban tunnels across a 6000 year time span and includes the specific engineering formulas/computations for the earliest 19th century subways/infrastructure projects based on the Roman vaulted arch tunnel.

关键词： Subway Subterranean Passageway Ancient Underground Mesopotamia Greece Rome cut and cover cloaca Maxima cryptoporticus croton Aq-ueduct Arch Tunnel Atlantic Avenue Tunnel London Railway London Tube Beach/Greathead Shield 19th century Arched Tunnel calculations

Transition metal impurities in silicon:computational search for a semiconductor qubit

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 2022年第1期8卷 1674-1684页

作者： cheng-Wei Lee Meenakshi Singh Adele c.Tamboli Vladan Stevanović colorado School of Mines GoldenCOUSA National Renewable Energy Laboratory GoldenCOUSA

Semiconductors offer a promising platform for physical implementation of qubits,but their broad adoption is presently hindered by limited scalability and/or very low operating *** from the nitrogen-vacancy centers in diamond,our goal is to find equivalent optically active point defect centers in crystalline silicon,which could be advantageous for their scalability and integration with classical *** metal(TM)impurities in silicon are common paramagnetic deep defects,but a comprehensive theoretical study of the whole 3d series that considers generalized Koopmans’condition is *** apply the HSE06(+U)method to examine their potential as optically active spin qubits and identify seven TM impurities that have optically allowed triplet–triplet transitions within the silicon band *** results provide the first step toward silicon-based qubits with higher operating temperatures for quantum ***,these point defects could lead to spin-photon interfaces in silicon-based qubits and devices for mid-infrared free-space communications.

关键词： Transition centers allowed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

面神经减压治疗Bell氏麻痹的历史回顾

国际耳鼻咽喉头颈外科杂志 1984年第1期 18-19页

作者： Adour KK diamond c 王尔贵

Duel于1931年首创面神经减压术治疗Bell氏麻痹,50年后在英国此手术已被放弃,而在美国仍在进行,但有争论。1931年后出现了多种手术方法和判断预后试验。借面神经减压手术50周之机,可以回顾一下既往并瞻望将来。为了解决Bel l氏麻痹手术... 详细信息

Duel于1931年首创面神经减压术治疗Bell氏麻痹,50年后在英国此手术已被放弃,而在美国仍在进行,但有争论。1931年后出现了多种手术方法和判断预后试验。借面神经减压手术50周之机,可以回顾一下既往并瞻望将来。为了解决Bel l氏麻痹手术处理方面存在的问题,作者们特按年代顺序进行如下评述。 1932年Ballance和Duel发表面神经麻痹手术治疗论文,提出感应电刺激无反应时,在面神经远侧端去除面神经管壁1厘米以减压;直流电刺激无反应则为手术禁忌症。1936年Morris提出在面神经垂直段下半段减压,宜在感应电无反应后3～4周手术。感应电反应部分受损和面瘫不改善也是指针。1936年Tumarkin进行“血管性减压”,行单纯乳突凿开术后,切断茎乳动脉

关键词：面神经管感应电刺激减压治疗 Bell 面神经减压术

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

性的进化

2020年

作者： (美)贾雷德·戴蒙德(Jared diamond)

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

沃顿商学院最受欢迎的谈判课

Surface and Interface Properties in Organic Light-Emitting Diodes

作者： (美)斯图尔特·戴蒙德(Stuart diamond)

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

Surface and Interface Properties in Organic Light-Emitting D...

AcHIEVING THRESHOLD BARRIER OF 1 nm ROUGHNESS VALUE OF SILIcON SURFAcE BY diamond TURNING

第九届全国发光学术会议

作者： R. Fung, c. S. Lee and S.T. Lee center Of Super diamond and Advanced Films (cOSDAF) & Department of Physics and Materials Science city University of Hong Kong Hong Kong, china

Device surfaces and interfaces in organic light-emitting diodes have been studied by X-rayphotoelectron spectroscopy (XPS), ultra-violet photoemission spectroscopy (UPS), and high-resolutionenergy loss spectroscopy (H...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

chinese Journal of Mechanical Engineering 1998年第1期11卷 7-11,19页

作者： Fang, Fengzhou Venkatesh, V.c. Nanyang Technological Univ Singapore Singapore

nm roughness value of silicon surface by diamond turning is obtained firstly and three novel techniques are proposed. The surface integrity is studied in detail by using atomic force microscope, scanning electron microscope, and stylus surface instrument. The diamond tool sharpness has a considerable influence on the machined surface, therefore a novel technique—brightness modulation for measuring accurately the edge of the cutter is proposed. Mirror surfaces are assessed by another novel technique—a measure of their reflectivity. A third technique, single grit diamond machining is carried out. It supplies a experimental evidence for verifying the obtained high quality turned surfaces.

关键词： Mirror surfaces diamond turning Brittle materials Single grit machining