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PREPARATION OF BIsPHENOL A EPOXY REsIN WATERBORNE DIsPERsIONs BY THE PHAsE INVERsION EMULsIFICATION TECHNIQUE

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chinese Journal of Polymer science 2000年第1期18卷 33-38页

作者： Zhen-zhong Yang De-lu Zhao Polymer physics Laboratory, institute of Chemistry, {2. {3. of sciences, beijing 100080, China 中科院化学所高分子物理及化学国家重点实验室北京

The phase inversion emulsification technique (PIET) is an effective physical method for preparing waterborne dispersions of polymer resins. some results concerning the preparation of bisphenol A epoxy resin waterborne dispersions by PIET in our laboratory were summarized. Electrical properties, rheological behavior and morphological evolution during phase inversion progress were systematically characterized. The effects of the emulsifier concentration and emulsification temperature on phase inversion progress and the structural features of the waterborne particles were studied as well. The deformation and break up of water drops in a shear field were analyzed in terms of micro-theology, while the interaction and coalescence dynamics of water drops were discussed in terms of DLVO theory and smoluchowski effective collision theory, respectively. Based on the experimental results and theoretical analysis, a physical model of phase inversion progress was suggested, by which the effects of the parameters on phase inversion progress and the structural features of the waterborne particles were interpreted and predicted.

关键词： phase inversion emulsification waterborne dispersions epoxy resin mechanism physical model

The size effect on transport properties of colossal magnetoresistance materials La_(0.67)Ca_(0.3.)MnO_3

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science China(physics,Mechanics & Astronomy) 2008年第3期51卷 251-257页

作者： LI PeiGang1,2.LEI Ming1,2.GUO YanFeng2.GUO Xi2.CHEN LeiMing2. TANG WeiHua1,2.sONG PengYun3.& CHEN JinPing3.1 Department of {2.,Center for Optoelectronics Materials and Devices,Zhejiang sci-Tech University,Hangzhou 3.0018,China 2.National Laboratory for Condensed Matter {2.,{2. of {2.,chinese academy of sciences,beijing 100080,China 3.Department of {2.,Peking University,beijing 100875,China Department of physics Center for Optoelectronics Materials and Devices Zhejiang Sci-Tech University Hangzhou China National Laboratory for Condensed Matter physics Institute of Physics Chinese Academy of Sciences Beijing China Department of physics Peking University Beijing China

high quality La0.67Ca0.3.MnO3.(LCMO) film was deposited via a novel pulsed electron deposition technique on srTiO3.100) single crystal substrate. The micro-bridge with different widths was fabricated by using electron beam lithography (EBL) technique and their transport properties were studied. For the micro-bridges with width of 2.and 1.5 μm,the insulator-to-metal transition temperature (TP) keeps un-changed compared with the film. For the micro-bridges with width of 1 μm,the TP shifts towards the lower temperature by 50 K. When the width decreases down to 500 nm,the insulator-to-metal transition disappears. The magnetoresistance be-havior of these micro-bridges was studied,and the results show that the low field magnetoresistance (LFMR) decreases and the high field magnetoresistances (HFMR) keep almost unchanged as the width of micro-bridge is reduced.

关键词： colossal magnetoresistance pulsed electron deposition electron beam lithography electrical transport properties

Inertial theory of the mean Hadley circulation under the condition of nonstatic equilibrium

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science China Earth sciences 2006年第5期49卷 546-553页

作者： CHAO Jiping1 & LIU Fei2.3.1. National Marine Environmental Forecasting Center, beijing 100081, China 2. Key Laboratory Regional Climate-Environment for Temperate East Asia, {2. of Atmospheric {2., {3. academy of sciences, beijing 10002., China 3. Graduate University of {3. academy of sciences, beijing 100049, China National Marine Environmental Forecasting Center Beijing China Key Laboratory Regional Climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Graduate University of chinese academy of sciences Beijing China

Tropical atmosphere is divided into two layers, the layer near the ground is the planet boundary layer, where the motion is linear, if the radiation equilibrium temperature is given at the top of the boundary layer, the vertical motion there can be obtained. It is the non-viscous ideal atmos- pheric layer above the boundary one, where the motion is nonlinear. After getting the conservation laws of angular momentum, potential temperature and potential vortex, the inertial theory of the Hadley circulation driven by the vertical motion of the boundary layer is established, followed by sev- eral examples of its application.

关键词： Hadley circulation, inertial theory, conservation laws of angular momentum, potential temperature and potential vortex.

structural and microstructural transformations in Bi_2.r_2.a_(1-x)Y_xCu_2._(8+y) system

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chinese science Bulletin 1997年第3期42卷 192-196页

作者： sONG Chengyu, WEN shulin and CHE Guangcan1. shanghai institute of Ceramics, chinese {2. of sciences, shanghai 2.0050, China 2. state Key Laboratory of supercon-ductivity, institute of physics, chinese {2. of sciences, beijing 100080, China shanghai institute of Ceramics Chinese Academy of Sciences Shanghai China state Key Laboratory of superconductivity Institute of Physics Chinese Academy of Sciences Beijing China

sINCE the discovery of high-Tc superconductors, experiments have revealed that the phase diagrams of La2.xsrxCuO4 and YBa2.u3.6+x resemble each other. The antiferromagnetic phase is commonly situated in the vicinity o... 详细信息

sINCE the discovery of high-Tsub>csub> superconductors, experiments have revealed that the phase diagrams of Lasub>2.xsub>srsub>xsub>CuOsub>4sub> and YBasub>2./sub>Cusub>3./sub>Osub>6+xsub> resemble each other. The antiferromagnetic phase is commonly situated in the vicinity of the superconductive phase. In Bi-2.12.sys-

关键词： Bi2.r2.a1-xYxCu2.y substitution structural transformation.

New evidence for lack of CMB power on large scales

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science China(physics,Mechanics & Astronomy) 2010年第3期53卷 567-570页

作者： LIU Hao1 & LI TiPei1,2.3.1 Key Laboratory of Particle Astrophysics, {2. of {2. {3. physics, chinese academy of sciences, beijing 100049, China 2.Department of physics & Center for Astrophysics, Tsinghua University, beijing 100084, China 3.Department of Engineering physics & Center for Astrophysics, Tsinghua University, beijing 100084, China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Department of physics & Center for Astrophysics Tsinghua University Beijing China Department of Engineering physics & Center for Astrophysics Tsinghua University Beijing China

A digitalized temperature map is recovered from the first light sky survey image published by the Planck team, from which an angular power spectrum of the cosmic microwave background (CMB) is derived. The amplitudes of the low multipoles (low-l) measured from the preliminary Planck power spectrum are significantly lower than those reported by the WMAP team. Possible systematical effects are far from enough to explain the observed low-l differences.

关键词： cosmology cosmic microwave background data analysis

Experimental study of electron capture excitation in collisions between Li-like N^(4+) ions and Na atoms

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chinese science Bulletin 1997年第5期42卷 368-371页

作者： LIU Zhanwen, ZHOU sixin, ZHANG Wen, ZHANG Xuezhen GUOXiaohong, WANG Youde, MA Xinwen, YANGZhihu, LIU Huiping, ZHAO Mengchun, YANG Feng, PAN Guangyan and LI Dawan1. institute of Modern physics, {2. {3. of sciences, Lanzhou 73.000, China 2. institute of physics, {2. {3. of sciences, beijing 100080, China institute of Modern physics Chinese Academy of Sciences Lamhou China institute of Physia Chinese Academy of Sciences Beijing China

WITH the rapid development of the technique of ionized atoms, the charge states of atoms that can be obtained now are so high that the H-like U91+ ions and naked U92. ions

WITH the rapid development of the technique of ionized atoms, the charge states of atoms that can be obtained now are so high that the H-like Usup>91+sup> ions and naked Usup>92.sup> ions

关键词： single electron capture double electron capture emission cross section excited states.

The principle of relativity, kinematics and algebraic relations

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science China(physics,Mechanics & Astronomy) 2010年第4期53卷 591-597页

作者： GUO HanYing1, HUANG ChaoGuang2.3. WU HongTu4 & ZHOU Bin5 1institute of Theoretical {2., {2. {3. of sciences, beijing 100190, China 2.1} of high energy {2., {2. {3. of sciences, beijing 100049, China 3.heoretical {2. Center for science Facilities, {2. {3. of sciences, beijing 100049, China 4Department of Mathematics, Capital Normal University, beijing 100048, China 5Department of {2., beijing Normal University, beijing 100875, China institute of Theoretical physics Chinese Academy of Sciences Beijing China institute of high {2. {3. Chinese Academy of Sciences Beijing China Theoretical physics Center for science Facilities Chinese Academy of Sciences Beijing China Department of Mathematics Capital Normal University Beijing China Department of physics Beijing Normal University Beijing China

Based on the relativistic principle and the postulate of universal invariant constants (c, l), all kinematic symmetries can be set up as the subsets of the Umov-Weyl-Fock-Hua transformations for the inertial motions. ... 详细信息

关键词： principle of relativity with (c l) Umov-Weyl-Fock-Hua transformations kinematics special relativity triple

An efficient chiral synthesis of (R)-N-[3.acetyl-4-(2.hydroxy-3.isopropylamino-propoxy)phenyl]-butanamide with {2. enantioselectivity

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science China Chemistry 2009年第8期52卷 1216-1219页

作者： WANG NaiXing1,2.& TANG XinLiang1,3.1 Technical institute of {2. and Chemistry,{2. {3. of sciences,beijing 100080,China 2.College of Chemistry and Chemical Engineering,Graduate University of {2. {3. of sciences,beijing 100049,China 3.school of Chemical Engineering and Environment,beijing institute of Technology,beijing 100081,China Technical institute of physics and Chemistry Chinese Academy of Sciences Beijing China College of Chemistry and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing China school of Chemical Engineering and Environment Beijing Institute of Technology Beijing China

R-Enantiomer of the β-receptor antagonist N-[3.acetyl-4-(2.hydroxy-3.isopropylamino-propoxy)phenyl] butanamide with {2. enantioselectivity was synthesized from cheap starting materials and enantiopure chiral reagent through an efficient,convenient and practical synthetic *** product was detected by 1H NMR,13. NMR,and Ms,and the enatiomeric excess was determined by chiral HPLC analysis using a chiracel AD-H column.

关键词： chiral synthesis enantioselectivity enatiomeric excess chiral HPLC analysis

The formation and stability of si_(1-x)C_x alloys in si implanted with carbon ions

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chinese science Bulletin 2001年第3期46卷 200-204页

作者： WANG Yinshu, LI Jinmin, JIN Yunfan, WANG Yutian, sUN Guosheng & LIN Lanying1. Department of physics, beijing Normal University, beijing 100875, China 2. {3. of semiconductors, chinese academy of sciences, beijing 100083. China 3. {3. of Modern physics, chinese academy of sciences, Lanzhou 73.000, China Department of physics Beijing Normal University Beijing China institute of semiconductors Chinese Academy of Sciences Beijing China institute of Modern physics Chinese Academy of Sciences Lanzhou China

si1-xCx alloys of carbon (C) concentration between 0.6%-1.0% were grown in si by ion implantation and high temperature annealing. The formation of si1-xCx alloys under different ion doses and their stability during annealing were studied. If the implanted dose was less than that for amorphizing si crystals, the implanted C atoms would like to combine with defects produced during implantation and it was difficult to form si1-xCx alloys after being annealed at 850℃. With the increment of implanted C ion doses, the lattice damage increased and it was easier to form si1-xCx alloys. But the lattice strain would become saturate and only part of implanted carbon atoms would occupy the substitutional positions to form si1-xCx alloys as the implanted carbon dose increased to a certain degree. Once si1-xCx alloys were formed, they were stable at 950℃, but part of their strain would release as the annealing temperature increased to 1 000℃. stability of the alloys became worse with the increment of carbon

关键词： ion implantation si1-xCx alloys stability of si1-xCx alloys.