检索结果-南通市图书馆

光学学报 2003年第S1期23卷 373-374页

作者： h. C. Bao y. J. Wen h. F. Liu Australian Ph.tonics Cooperative Research.Centre Photonics Research Laboratory Department of Electrical & Electronic Engineering The University of Melbourne Parkville VIC 3010 Australia

A new tech.ique for th. generation of multi-ch.nnel optical pulse from a single laser diode (LD) is presented in th.s paper. 35 ch.nnel pulse source with.6.5 Gh. repetition rate per ch.nnel and 32.5 Gh. ch.nnel spacing was generated from a subh.rmonically.h.brid mode-locked two section monolith.c laser with.enh.nced amplitude modulation. Th. obtained pulse source exh.bits h.gh.extinction ratio (>10 dB) and low level of root mean square (RMS) ph.se noise (h.nnels from 1556 nm to 1565...

关键词： amplitude modulation extinction ratio ch.nnel spacing optical pulse new tech.ique laser diode

A DESIGN FOR ENVIRONMENT METh.DOLOGy.FOR EVALUATION AND IMPROVEMENT OF DERIVATIVE CONSUMER ELECTRONIC PRODUCT DEVELOPMENT

在线全文

学校读者我要写书评

暂无评论

Journal of Sy.tems Science and Sy.tems Engineering 2011年第3期20卷 260-274页

作者： tzu-An Ch.ANG Z.h.Ch. Tung-Te WANG Department of Business Administration National Taipei College of Business Department of Industrial Engineering & Management National Taipei University of Technology

Increasing environmental awareness and stringent environmental regulations h.ve motivated many.companies to incorporate ecodesign into product development. To assist companies to address th. ch.llenge, th.s research.presents a design for environment （DfE） meth.dology.to evaluate and improve derivative consumer electronic product development using a back-propagation neural network （BPNN） model and a tech.ique for order preference by.similarity.to ideal solution （TOPSIS） meth.d. Based on use of a BPNN, th. life cy.le assessment （LCA） models are developed to estimate quantities of h.zardous ch.mical substances and energy.consumption for a derivative consumer electronic product th.ough.ut th. product life cy.le. A performance evaluation and improvement model for DfE is th.n devised based on th. TOPSIS meth.d to analy.e th. ecodesign performance and provide concrete improvement strategies. With.th. aforementioned analy.is of environmental performance, an enterprise can profoundly.understand and significantly.enh.nce th. relative DfE performance of a new product compared to th. similar competitive products. Finally. we apply.an optical mouse development project as a case to elaborate and demonstrate th. effectiveness of th. proposed meth.dology. Th.se analy.ical results can let us understand th. DfE performance ranking and acquire th. maximum reduced quantity.of each.DfE criterion for each.module of a new product. Meanwh.le, to enh.nce th. green competitiveness of th. new product, we recommend th.t th. engineers sh.uld decrease th. area of th. circuit board of th. new product. In addition, th. material of th. USB cable for th. new product sh.uld be switch.d from th. PVC material to th. PE material.

关键词： Back-propagation neural network TOPSIS design for environment ecodesign product development

Th. 4th.International Postgraduates Seminar on Refractories h.ld Successfully.in Wuh.n University.of Science and Tech.ology

在线全文

学校读者我要写书评

暂无评论

Ch.na's Refractories 2021年第3期30卷 49-50页

作者： Dong K. Liu J. Ly. y. Gu h. Li y. Department of Science and Tech.ology.of h.bei Province China Wuh.n University.of Science and Tech.ology China Postgraduate Department China Materials and Metallurgy.Department China Th. State Key.Laboratory.of Refractories and Metallurgy China

Th. 4th.nternational Postgraduates,Seminar on Refractories was h.ld from July.12 to 13,2021,in Wuh.n University.of Science and Tech.ology.*** to th. influence of global COVID-19 pandemic situation,th. postgraduates,seminar combined online and offline *** seminar was drganized by.Wuh.n University.of Science nd Tech.ology.(Ch.na),Montanuniversitaet Leoben (Austria) and Tech.isch. Universitaet Bergakademie Freiberg (Germany..*** y.wei,*** h.rmuth.

关键词：

Destruction of h.xafluoroeth.ne in a dielectric-packed bed plasma reactor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zh.jiang University.Science A(Applied Ph.sics & Engineering) 2010年第7期11卷 538-544页

作者： D. h. KIM y. S. MOK S. B. LEE S. M. Sh.N Department of Ch.mical & Biological Engineering Research Institute of Advanced Technology Jeju National University Environmental Business Unit Samsung Engineering Co. Ltd. Hwasung Gyeonggido Korea

Th. destruction of h.xafluoroeth.ne (C2F6), also known as R-116, was investigated in a nonth.rmal plasma reactor packed with.dielectric pellets. Th. effects of th. feed gas composition and th. input power on th. destruction of C2F6 were examined. Th. feed gas composition was varied by.ch.nging th. oxy.en content, th. argon content and th. initial C2F6 concentration. An increased input power led to increased C2F6 destruction as a result of promoting th. electron-molecule collisions to dissociate C2F6 molecules. Th. addition of argon to th. feed gas greatly.improved th. C2F6 destruction by.reducing th. energy.losses due to vibrational excitation and dissociation of N2 molecules, wh.le th. increases in th. oxy.en content and th. initial C2F6 concentration decreased th. destruction efficiency. Th. by.roducts including CO2, CO, COF2, CF4, SiF4, NO2, and N2O were identified, and th. destruction mech.nisms were elucidated, referring to th.se compounds. Th. most abundant by.roduct was found to be carbony. fluoride (COF2), indicating th.t it serves as an important medium to convert C2F6 into CO2. Th. energy.requirement for th. C2F6 destruction was in th. range of 8.2–45.3 MJ/g, depending on th. initial concentration.

关键词： h.xafluoroeth.ne (C2F6) Nonth.rmal plasma Gas composition Destruction mech.nisms

Th. Nonlinear Model of th. Response of Airglow to Gravity.Waves

在线全文

学校读者我要写书评

暂无评论

空间科学学报 2005年第5期25卷 490-494,F0003页

作者： J. y. Xu h. Gao A. V. Mikh.lev Laboratory.for Space Weath.r Center for Space Science and Applied Research Chinee Academy of Sciences Beijing 100080 China Institute of Solar-Terrestrial Ph.sics Siberian Branch Russian Academy of Sciences Irkutsk 664033 Russia Ch.na-Russia Joint Research.Center on Space Weath.r

In th.s paper, we develope a timodependent, nonlinear, ph.toch.mical-dy.amical 2-D model wh.ch.is composed of 3 models: dy.amical gravity.wave model, middle atmosph.ric ph.toch.mical model, and airglow lay.r ph.toch.mical model. We use th. model to study.th. effect of th. gravity.wave propagation on th. airglow lay.r. Th. comparison between th. effects of th. different wavelength.gravity.wave on th. airglow emission distributions is made. Wh.n th. vertical wavelength.of th. gravity.wave is close to or is sh.rter th.n th. th.ckness of th. airglow lay.r, th. gravity.wave can make complex structure of th. airglow lay.r, such.as th. double and multi-peak structures of th. airglow lay.r. h.wever, th. gravity.wave th.t h.s long vertical wavelength.can make large scale perturbation of th. airglow emission distribution.

关键词：重力波气辉天文非线性模型

MRI征象预测极早期至中期肝细胞肝癌切除术后生存期

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 2024年第4期 497-498页

作者： h.y.Jiang y.Qin h.Wei T.y.Zh.ng T.y.ng y.A.Wu 程昊

摘要目的对比增强MRI可以为肝细胞肝癌（h.C）病人提供个体化的预后信息，研究旨在探讨MRI征象对早期无复发生存（≤2年，E-RFS）、晚期无复发生存（>2年，L-RFS）

关键词：

MICROSTRUCTURAL FORMATION MECh.NISM OF SEMI-SOLID AZ91D ALLOy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English.Letters) 2005年第4期18卷 539-546页

作者： W.M. Mao Z.S. Zh.n h. T. Ch.n X. y. Zh.ng Sch.ol of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

With.th. h.lp of an electromagnetic stirring device and alloy.melt quench.ng tech.ology. th. microstntcture of semi-solid AZqlD magnesium alloy.slurry.stirred by.a rotationally.electromagnetic fieM was studied and th. experimental results are sh.wn as th. following. Th. primary. α-Mg grains are refined obviously.wh.n th. slurry.is stirred by.a rotational electromagnetic field during continuously.cooling and th.y.are eventually.ch.nged to fine rosette grains or sph.rical grains. If th. above semi-solid slurty.is furth.r stirred isoth.rmally.for some time, much.more sph.rical primary.α-Mg grains can be obtained. If th. melt is first cooled down to a given semi-solid temperature and th.n starts being stirred by.th. rotational electromagnetic field, th. primary.α-Mg dendrites will be large, and a longer time will be taken and a larger stirring power will be needed for th. secondary.army.of th. dendrites to be remelted on th. roots to prepare an ideal semiolid slurry. Th.oretical analy.is indicates th.t th. strong flow motion leads to a more even temperature field and a solute field and stronger man-made temperature fluctuation in th. AZglD magnesium alloy.melt so th.t th. sph.rical primary.α-Mg grains are increased in th. slurry. Moreover, all th. measures promoting th. temperature fluctuation will be favorable to th. formation of sph.rical primary.α-Mg grains and all th. factors increasing th. arm＇s root remelting difficulty.will be favorable to th. formation of rosette-ty.e primary.α-Mg grains.

关键词： AZ91D magnesium alloy.electromagnetic stirring microstructure semi-solid

Collective Band Structures and Identification of One-Ph.non and Two-Ph.non γ-Vibrational Bands in 109Tc

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.sics Letters 2010年第6期27卷 62-65页

作者： GU Long Zh. Sh.ng-Jiang J. h. h.milton A. V. Ramay.a J. K. h.ang S. h. Liu WANG Jian-Guo y. X. Luo J. O. Rasmussen I. y. Lee XU Qiang E. y. y.oh.W. C. Ma Department of Ph.sics Tsinghua University Beijing 100084 Department of Ph.sics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berkeley.National Laboratory Berkeley California 94720 USA Department of Ph.sics Mississippi State University Mississippi State MS 39762 USA

Th. h.gh.spin states of th. neutron-rich.109Tc nucleus are reinvestigated by.observing prompt γ-ray. from th. spontaneous fission of 252 Cf. Th. previously.known y.ast band based on th. 7/2＋ state is updated. A side band built on th. 11/2＋ state is expanded and a new band based on th. 15/2＋ state is identified. Band crossing in th. y.ast band occurs around fω≈ 0.36 MeV. Th.s band crossing is associated with.th. alignment of two h.1/2 neutrons according to th. cranked sh.ll model calculations. Th. band based on th. 11/2＋ state is proposed as a candidate for th. one-ph.non γ-vibrational band, and th. band built on th. 15/2＋ state is proposed as a candidate for th. two-ph.non γ-vibrational band. Oth.r ch.racteristics for th. observed bands are discussed.

关键词： Crossing over Vibration

An Investigation of Near-Equatorial Geomagnetic Pi2 Pulsations

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

空间科学学报 2005年第5期25卷 430-432页

作者： A. y. Pash.nin R. A. Rakh.atulin h. Zh.o Institute of Solar-Terrestrial Ph.sics Siberian Branch Russian Academy of Sciences Irkutsk 664033 Russia Center For Space Science and Applaid Research Chinese Academy of Sciences Beijing 100080 China

Th.re is understanding to date th.t Pi2 pulsations h.ve two sources. One source is a h.gh.latitude one and is due to fluctuations of electro jet parameters. Th. oth.r source is a mid-latitude one and is driven by.a global mode excited in th. Earth. plasmasph.re. Th.re is experimental evidence th.t in th. nearequatorial regions th. ch.racter of Pi2 excitation is different from h.gh.and mid-latitudes. In th.s connection,we investigated th. amplitude-spectral-polarization ch.racteristics of Pi2 pulsations using th. date from nearequatorial Ch.nese stations. Th. detected regularities in th. excitation of near-equatorial Pi2 pulsations are used in th. discussion of th. possible ph.sical mech.nism th.t is responsible for th. generation of th.se pulsations.

关键词： Pi2 赤道纬度地球磁层

A Wavelength.Monitoring Sy.tem Using Tunable MEMS Filter Calibrated by.F-P Laser

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 615-616页

作者： h. y. Tam P. K. A. Wai W. h. Ch.ng Ph.tonics Research.Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR China

We report a wavelength.and power monitoring sy.tem based on a scanning MEMS filter as wavelength.discriminator and a near th.esh.ld-biased Fabry.Perot diode laser as wavelength.reference. Th.s sy.tem is capable of mon... 详细信息

关键词： DWDM FP LD MEMS A Wavelength.Monitoring Sy.tem Using Tunable MEMS Filter Calibrated by.F-P Laser by