检索结果-南通市图书馆

science China Earth sciences 2009年第6期52卷 784-796页

作者： ZHANG HuaQiao1,2.& DONG XiPing1,2.1 school of Earth and Space {3.s,Peking {2.,Beijing 100871,China 2.State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of {3.s,Nanjing 2.0008,China school of Earth and Space sciences Peking University Beijing 100871 China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

Although fossils of Orsten-type preservation represented by Skaracarida and Phosphatocopina were first reported from the Middle and Upper Cambrian in western Hunan, South China in 2.05, diversified phosphatocopine species have never been appropriately described and elucidated in terms of their evolutionary relationships. Here, we described two new species of Phosphatocopina, Vestrogothia anterispinata sp. nov. and V. bispinata sp. nov. The evolutionary relationship among all the valid species of Phosphatocopina is discussed and the phylogeny of Phosphatocopina is reestablished using cladistic analysis. Accordingly, phosphatocopines primitively evolved along two lineages: one evolved towards the emergence of lobes; the other evolved towards the emergence of dorsal spines. Respectively, lobes originated independently three times, and dorsal spines originated only once. With regard to the dorsal rims, interdorsum originated first, whereas dorsal furrow originated independently twice on the basis of interdorsum. Probably Hesslandona may represent a polyphyletic group, whereas Vestrogothia a monophyletic group.

关键词： fossils of Orsten-type preservation Vestrogothia Phosphatocopina Crustacea evolution phylogeny Cambrian Hunan

EVOLUTION AND SPIRAL STRUCTURE OF SPIRAL GALAXY

在线全文

学校读者我要写书评

暂无评论

science in China,Ser.A 1979年第10期 1185-1195页

作者：刘永镇 Graduate school university of science and {2. of China

In this paper, considering possible mutual influence between galactic evolution and spiral structure, we have discussed the density wave theory of galactic spiral for the slowly evolving galaxy. The starting point of the theory is the substitution of the axisymmetric unsteady basic state for the usual axisymmetric steady basic state. We have obtained the dispersion relationship, the conservation equation of wave-action, and the energy *** found a number of general conclusions, specifically the following which are noteworthy. (ⅰ) Density waves can obtain energy from energy interchange with galactic differential motion. (ⅱ) In the theory, a distinction may be made between trailing and leading waves. From the trend of galactic evolution of expanding or contracting, we can conclude that the predominant forms are either trailing or leading arms. (ⅲ) For galaxies of which only trailing arms can be observed, the character of the evolution of the spiral galaxy is expansion. (ⅳ) For our Galaxy, the M

关键词： EVOLUTION AND SPIRAL STRUCTURE OF SPIRAL GALAXY

Study on Fit Quality Collaborative Control under Networked Manufacturing Environment （ID:B-013.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Study on Fit Quality Collaborative Control under Networked M...

Point-piezomagnetic Properties of the FeCuNbSiB Alloy Strips

第十四届工业工程与工程管理国际会议

作者： Yang Musheng~( 2. Zhang yu~1 Chen Rong~1 1 school of Mechanical Engineering Shandong university of {2. and {3. Zibo P.R.China 2.5049 2.school of Mechanical Engineering Nanjing university of {2. and {3. Nanjing P.R.China 2.0094

＜正＞Networked Manufacturing is an advanced manufacturing mode that is brought in Networked economy condition and be used *** quality control of Host machine factory is difficult to ensure because of complexity and dis- tribution of the networked *** engineers and specialists have done a great deal of study in this field, mostly about the architecture of Network Manufacture system,networked manufacturing quality management,quality col- laborative ensure and so on,but it is not pay more attention to fit quality collaborative control in Network Manufactur- ing. This paper presents an architecture of product quality collaborative control based on Network Manufacture mode is presented,discuss that how to using the quality collaborative control between host machine factory and collaborative fac- tory to ensure product quality,and how to guarantee final product quality of host machine *** utilizing effective data model,statistical inference techniques,quality-oriented statistical tolerance technique,statistical quality control techniques,quality collaborative Controller,the optimal fit quality of product is *** method provides good method for networked manufacturing to control product quality in ***’s also worth for a mass customization tech- nique in Network Manufacture.

关键词： Process Capability Fit Quality Collaborative Control Quality-oriented Target

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

Journal of wuhan university of {2.(Materials {3.) 2009年第1期24卷 114-118页

作者：朱正吼 school of Materials sciences and Engineering Nanchang University

The piezomagnetic properties of rapidly quenched Fe73.5Cu1Nb3.i13.5B9 alloy strips were investigated in as-quenched state and after annealing for 2.h in vacuum in the temperature range of 100-3.0 ℃. The impedance of amorphous strips increases with frequency, and sensitively de-creases with stress increasing, especially in the frequency range of 10-100 MHz. The impedance in-creases approximately linearly with frequency below the critical frequency, but begins to decrease non-linearly with frequency above the critical frequency. The higher the point compressive stress is, the smaller the critical frequency will be. The stability of piezomagnetic properties is very excellent. The impedance of amorphous strips after annealing, especially at 3.0 ℃, decreases very strongly. The impedance and the absolute values of the sensitive degree of couple layers＇ amorphous strips are lower than those of single layer strips.

关键词： piezomagnetic properties amorphous strips impedance

A Structure Innovation on the Loading/Unloading Equipment for MSW Container

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2006年第S2期28卷 758-762页

作者： YANG Xianhai LV Chuanyi school of Machinery Engineering,Shandong university of {2.,Zibo 2.5049,China school of Machinery Engineering Shandong University of TechnologyZibo 255049China

A structure innovation on the loading/unloading equipment for MSW (municipal solid waste) container was de- *** disposing chain transmission perpendicularly,the loading/unloading equipment for MSW container was developed by linear movement part of the chain *** of transmission mechanism on the motion stability of chain transmission was *** relation between chain sag,chain length and chain pitch numbers was studied,and the calculation equation of chain sag by perpendicularly disposing chain transmission was *** relation curve between allowed abrasion ratio and pitch numbers of chain was studied,the reason for tooth-leap was analyzed,and new equipment of preventing tooth-leap was put for- ***/unloading devices equipped with new transmission mechanism have been made into products,and this structure in- novation has been applied in practice *** made considerable economic and social benefit.

关键词： structure innovation chain motion stability tooth-leap

Optimal 1 → M phase-covariant cloning in three dimensions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第7期23卷 269-273页

作者：张文海余龙宝曹卓良叶柳 Department of Physics Huainan Normal University school of Electronic and Information Engineering Hefei Normal University school of Physics and Material science Anhui University

In this paper, we derive the explicit transformations of the optimal 1→3. 4, 5 phase-covariant cloning in three dimensions, and then generalize them to the cases of 1 → M = 3., 3. ＋ 1, 3. ＋ 2.（n ≥ 1 integer） cl... 详细信息

关键词： quantum cloning universal quantum cloning phase-covariant cloning

High Accuracy Michelson Interference Wavemeter

在线全文

学校读者我要写书评

暂无评论

High Accuracy Michelson Interference Wavemeter

Numerical investigation of the effect of sub-grid scale eddies on the dispersed particles by LES/FDF model

ICEMI'2.05第七届国际电子测量与仪器学术会议

作者： Wang Liqiang1 Li Cheng 2.Song Feijun3.(1.Electronic Engineering school, Beijing university of Posts and Telecommunications,Beijing 100876, China) (2. Department of Precision Instruments and Mechanology, Tsinghua university, Beijing 100084, China) (3.DaHeng Epoch {3. and technology Stock Company Limited,Beijing 100086, China)

Structure and operation principle of Michelson wavemeter are formulized in detail. It use stabilized by iodine 63.nm He-Ne laser as Optical source. Frequency stabilized by double longitudinal mode is

关键词： Wavement michelson inference frequency-stabilized PLL MCU.

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

science China(Technological sciences) 2010年第5期53卷 1304-1308页

作者： JIN HanHui1,CHEN SuTao1,CHEN LiHua1 & FAN JianRen2.1 school of Aeronautics and Astronautics,Zhejiang university,Hangzhou 3.002.,China 2.State Key Lab of Clean Energy Utilization,Zhejiang university,Hangzhou 3.002.,China 1. school of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China2. State Key Lab of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

An LES/FDF model was developed by the authors to investigate the SGS effect on the particle motion in the gas-particle two-phase plane wake *** simulation results of dispersion rate for different particles were compared with the results without using the FDF *** was shown that the large eddy structure is the dominant factor influencing the particle diffu-sion in space for small particles(small Stokes-number particles),but for intermediate or large diameter particles,the influence of the sub-grid scale eddies on the dispersion rate is in the same order as that of the large *** sub-grid scale eddies increase the particle dispersion rate in most time,but sometimes they decrease the dispersion *** sub-grid scale particle dispersion rate is decided not only by the intensity of sub-grid scale eddies and the Stokes number of the particles,but also by the large eddy structure of the flow *** the particles in isotropic turbulence,the dispersion rate decreases as the particle diameter increases.

关键词： multiphase flow large eddy simulation filtered density function turbulence sub-grid

Stability Analysis of Set-Point-Related Indirect Iterative Learning Control with PI-Type Local Controller

在线全文

学校读者我要写书评

暂无评论

Stability Analysis of Set-Point-Related Indirect Iterative L...

胃化学性炎性痛时幽门括约肌内肠神经系统神经递质的变化

第二十九届中国控制会议

作者： WANG Youqing1,ZHOU Donghua2.1.school of Information science&{2.,Beijing {3. of Chemical {2.,Beijing 10002.,P.R.China2.Department of automation,Tsinghua {3.,Beijing 100084,P.R.China

The set-point-related（SPR）indirect iterative learning control（ILC）is used to update the set-point for a local *** as a supervision module for the local controller,SPR indirect ILC can improve the tracking performance of the closed-loop system along the batch *** the previous works,the local controller was assumed to be P-type for *** this work,a more general form for the local controller,the PI-type controller,was *** on a 2.dimensional（2.）Roesser’s system framework,a sufficient condition for asymptotical stability of multi-input multi-output linear batch processes under the SPR indirect ILC was derived in this paper.A numerical example was used to validate the proposed results.

关键词： Iterative Learning Control Indirect ILC Set-Point PI-Type Local Control 2.Dimensional Model

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

同济医科大学学报 2001年第4期30卷 307-309,F003页

作者：李琴胡道松茹立强华中科技大学同济医学院基础医学院神经生物学教研室武汉430030

为探讨大鼠幽门括约肌在化学性炎性痛时氮能和胆碱能神经元的变化 ,采用还原型辅酶和亚铁氰化铜直接显色的组织化学法 ,分别显示一氧化氮合酶 (NOS)和乙酰胆碱酯酶 (ACh E)阳性神经元成分及甲醛诱发胃痛后 2.神经元成分的变化。结果... 详细信息

为探讨大鼠幽门括约肌在化学性炎性痛时氮能和胆碱能神经元的变化 ,采用还原型辅酶和亚铁氰化铜直接显色的组织化学法 ,分别显示一氧化氮合酶 (NOS)和乙酰胆碱酯酶 (ACh E)阳性神经元成分及甲醛诱发胃痛后 2.神经元成分的变化。结果显示 :甲醛致胃炎性痛时大鼠幽门括约肌粘膜下丛及肌间神经丛 NOS和 ACh E阳性神经成分活性均降低 ,仅于括约肌肠侧端或胃侧端偶见单个分布的 2.酶弱阳性胞体 ,肌内 2.神经纤维数减少 ,酶活性也弱。图像分析肌内 NOS和 ACh E阳性神经纤维活性平均光密度 ,甲醛组比对照组均显著降低 (P<0 .0 1)。提示在甲醛引起的胃急性化学性炎性痛时肠神经系统中 NO-和

关键词：一氧化氮合酶乙酰胆酯酶肠神经系统大鼠幽门括约肌化学性炎性胃痛