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QUANTITATIVE rEDOX SCANNING OF TISSUE SAMPLES USING A CALIBrATION PrOCEDUrE

Journal of Innovative Optical Health Sciences 2009年第4期2卷 375-385页

作者： HE N.xu BAOHUA WU SHOKO NIOKA BrITTON CHANCE LIN z.LI Molecular Imaging Laboratory Department of Radiology University of PennsylvaniaPhiladelphia PA 19104USA Johnson research Foundation Department of Biochemistry and Biophysics University of Pennsylvania PA 19104USA

The fluorescence properties of reduced nicotinamide adenine dinucleotide(NADH)and oxidizedflavoproteins(Fp)including flavin adenine dinucleotide(FAD)in the respiratory chain are sensitive indicators of intracellular metabolic states and have been applied to the studies of mitochondrial function with energy-linked *** redox scanner,a three-dimensional(3D)low temperature imager previously developed by Chance et al.,measures the in vivo metabolicproperties of tissue samples by acquiring fluorescence images of NADH and *** redox ratios,***/(Fp+NADH)and NADH/(Fp+NADH),provided a sensitive index of the mitochondrialredox state and were determined based on relative signal intensity *** we report thefurther development of the redox scanning technique by using a calibration method to quantifythe nominal concentration of the fluorophores in *** redox scanner exhibited very goodlinear response in the range of NADH concentration between 165–1318µM and Fp between90–720µM using snap-frozen solution *** samples such as human tumor mousexenografts and various mouse organs were redox-scanned together with adjacent NADH and Fpstandards of known concentration at liquid nitrogen *** nominal NADH and Fpconcentrations as well as the redox ratios in the tissue samples were quantified by normalizing the tissue NADH and Fp fluorescence signal to that of the snap-frozen solution *** calibration procedure allows comparing redox images obtained at different time,independent of instrument *** quantitative multi-slice redox images revealed heterogeneity inmitochondrial redox state in the tissues.

关键词： NADH flavoprotein redox ratio mitochondria tissue heterogeneity

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DEFOrMATION BEHAVIOr OF AA6063 ALUMINIUM ALLOY AFTEr rEMOVING FrICTION EFFECT UNDEr HOT WOrKING CONDITIONS

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Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 451-458页

作者： z. Y. Chen S. Q. xu X.H. Dong National Die ＆ Mold CAD Engineering research Center Shanghai Jiaotong University Shanghai 200030 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The hot deformation behavior of AA6063 aluminium alloy has been investigated by means of compression tests at temperatures between 400 and 520℃, and strain rates ranging from 2.5 to 10 s^-1. Owing to the barreling, the theoretical model on the basis of Hills general method is used to calculate the flow stress of a cylindrical specimen under uniaxial simple compression so as to consider the friction effect at the die-specimen interface. A method of evaluating the friction coefficient by combining compression tests with the finite element method is presented. The real flow behavior of AA6063 aluminium alloy can be described with sinh-Arrhenius equation. The hot deformation activation energy Q derived from the corrected stress and strain data is 232. 350 kJ/mol.

关键词： Barreling Compression test Friction Flow stress Aluminium alloy Activation energy

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COMPArISON OF MATErIAL FOr ENCAPSULATING MINIMODULES

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 380-384页

作者： z.zhang H.Shen X.Q.xu W.Chen GuangzhouInstituteofEnergyConversion TheChineseAcademyofSciencesGuangzhou510070China GuangzhouInstituteofEnergyConversion TheChineseAcademyofSciencesGuangzhou510070China／／TheSchoolofPhysicsandEngineeringZhongshanUniversityGuangzhou510640China

The main characteristics of glass, polymethyl methacrylate (PMMA) and polycarbon ate (PC) were presented. The transmittance of glass, PMMA and PC was measured by the UV-VIS spectroscopy analysis. PMMA and PC have the advantages of higher tra nsparency, higher resistance and lower density. It is indicated that both PMMA a nd PC are suitable for encapsulating solar minimodules.

关键词： solar module PMMA PC encapsulate

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Freeze-thaw resistance of Concrete in Seawater

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武汉理工大学学报 2010年第17期32卷 108-111页

作者： SHUI z H xu H G zHAN B J School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Transportation Bureau of Xinganmeng Inner Mongolia Ulanhot 137400China

The effect of freeze-thaw cycles in seawater on the performance of concrete was studied in this paper. Concrete samples with different water binder ratio and different component were prepared,and were then put into fresh water and synthesized seawater. After the experiments of freeze-thaw cycles,the mass loss,relative dynamic elastic modulus (rDEM) and compressive strength of each sample were tested. The results obtained reveal that with the increase of the water binder ratio,the resistance ability of freeze-thaw impact in seawater of concrete decrease dramatically. When the concrete contain 15% fly ash and 20% slag,its resistance ability to the freeze-thaw impact in seawater is the optimal. Compared to the seawater corrosion,the impact of freeze-thaw cycles to the properties of concrete is severer.

关键词： freeze-thaw damage seawater mass loss relative dynamic elastic modulus

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US economic and trade sanctions against China: A loss-loss confrontation

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Economic and Political Studies 2023年第1期11卷 17-44页

作者： Liang Guo Sizhu Wang Nicole z.xu Jack H.Brown College of Business and Public Administration California State UniversitySan BernardinoCAUSA School of Finance Renmin University of ChinaBeijingChina Chinese American Youth Association AtlantaGAUSA

The economic and trade sanctions implemented by the United States(US)against China have lasted for a few decades and the structural imbalance of the US–China trade relationship has ultim-ately been escalated to a trade war *** examine the eco-nomic impacts of US sanctions against China on both sponsor and target countries during the last 20 *** find that such impacts have significantly changed over *** one hand,US economic sanctions have gradually extended from China’s labour-intensive to high value-added products and they have largely slowed down China’s trade growth for the last *** the other hand,US consumers and businesses have faced higher pri-ces and production costs for Chinese imports(or import substi-tutes)in the wake of the increasing US trade sanctions,leading to great deadweight losses to the sponsor *** addition,US economic and trade sanctions against China have largely impacted other economies involved in US–China trade as *** intermediary status of the Hong Kong SAr has been greatly ***,US economic and trade sanctions have caused pain on both China and the US,but their impact on China(the target country)has been largely weakened.

关键词： Economic sanctions US–China trade war export control

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Observation and Simulation of n=1 reversed Shear Alfvén Eigenmode on the HL-2A Tokamak

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Chinese Physics Letters 2022年第10期39卷 26-33页

作者： P.W.Shi Y.r.Yang W.Chen z.B.Shi z.C.Yang L.M.Yu T.B.Wang X.X.He X.Q.Ji W.L.zhong M.xu X.r.Duan Southwestern Institute of Physics Chengdu 610041China State Key Laboratory of Intense Pulsed radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

A branch of high-frequency Alfvenic modes is observed on the HL-2A *** electromagnetic mode can be driven unstably in the plasma with an off-axis neutral beam *** mode frequency keeps almost unchanged or presents a slow-sweeping behavior,depending on the detail current *** poloidal and toroidal mode numbers are𝑚m/n=1/*** mode has a quite short duration(≤20 ms)and usually appears 5-10 ms after the neutral beam being injected into the *** simulations based on M3D-K have also been carried *** result suggests that co-passing energetic particles are responsible for the mode *** simulated mode structures are localized nearby location of minimum safety factor(q_(min))and agree with the structures obtained through tomography of soft x-ray ***,the modes are localized in the continuum gap and their frequencies increase with variation of𝑞min in a wide *** but not least,the characteristic of unchanged frequency on experiment is also reproduced by the nonlinear simulation with a fixed safety *** those evidences indicate that the𝑛n=1 high-frequency mode may belong to a reversed shear Alfven eigenmode.

关键词： Alfven mode unchanged

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MICrOSTrUCTUrE OF BINArY Mg-Al EUTECTIC ALLOY WIrES PrODUCED BY THE OHNO CONTINUOUS CASTING PrOCESS

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Acta Metallurgica Sinica(English Letters) 2008年第4期21卷 275-281页

作者： z.M. zhang T. Lü C.J. xu X.F. Guo School of Materials Science ＆ Engineering Xi＇an University of Technology Xi＇an 710048 China

Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting （OCC） process and the microstructure was examined. It was found that the wires possess obvious unidirectional growth characteristic along its axial direction. The microstructure consists of parallel columnar grains that resulted from the competitive growth of equiaxed grains solidified on the head of dummy bar. Each columnar grain comprises regular eutectic a-Mg and β-Mg17 Al12 phases, which grew along the axial direction of the wires. The morphology of the eutectic is mainly lamellar, meanwhile rod eutectic exists. The formation of rod eutectic was attributed to the ＂bridging effect＂ caused by incidental elements in the alloy.

关键词： Mg-Al alloy Eutectic structure Directional solidification OCC process

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KINETIC STUDY OF SPINEL LiMn_2O_4 SYNTHESIzED BY SOLID rEACTION WITH SOFT-CHEMICAL METHOD

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 512-518页

作者： C.Q. xu Y. W. Tian Y. C. zhai z.J. Guo z. Q. Huang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The differential thermal analysis （DTA） curves were measured at different heating rates in flowing air for studying the synthesis of the spinel LiMn2O3 with Li2CO3 and MnO2, The reaction began at about 503K, and finished at about 873K. The apparent activation energy of Kissinger method was about ***^-1, the reaction orderwas 1.67, the frequency factor was 7.81×10^9, and therefore the dinetic epuation was dδ/dt=A·exp（- E/rT）·（1-δ）^n=7.81×10^9, exp（-122770/rT）·（l-δ）^1.67 . Coats-redfem integral method was used to analyze the DTA curves of the samples at different heating rates, and the calculated apparent activation energy and frequency factor were 112. 13kJ· mol^-1 and 1.18 × 10^9, respectively, rather close to that of Kissinger method. X-ray diffraction （XrD） and scanning electron microscope （SEM） results shown that the synthesized LiMn2O3 possesses pure phase, regular shape and normal particle distribution.

关键词： lithium manganese oxides synthesized kinetics Kissinger method,Coats-redfern integral method

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SYNTHESIS　AND　CATALYTIC　PrOPErTIES　OF　LAYErED　DOUBLE　HYDrOXIDES　PILLArED　BY　HETErOPOLYOXOMETALATE

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Chinese Chemical Letters 1995年第8期6卷 719-722页

作者： xu, z He, HM zhou, DM Wen, LS Jiang, D Wu, Y Jilin Univ Dept Chem Changchun 130023 Peoples R China Chinese Acad Sci Changchun Inst Appl Chem Changchun 130021 Peoples R China

Layered double hydroxides(LDHs)pillared with heteropolyoxometalate have been synthesized via both restructuring of hydrotalcite-like compounds and direct anion exchange under microwave *** and their derivatives are both found to be efficient for alkylation of isobutane with butene with a higher butene conversion and selectivity towards Cso

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Microwave sintered porous CoCrFeNiMo high entropy alloy as an efficient electrocatalyst for alkaline oxygen evolution reaction

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Journal of Materials Science & Technology 2021年第20期79卷 171-177页

作者： J.Tang J.L.xu z.G.Ye X.B.Li J.M.Luo School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang330063China

Developing efficient,stable and economical electrocatalyst for oxygen evolution reaction(OEr)is a significant pathway to produce clean energy from water ***,the promising and highly efficient porous CoCrFeNiMo high entropy alloys(HEAs)were prepared by microwave sintering using Mg space *** to unique properties of high entropy alloys and abundant active surface area,the porous CoCrFeNiMo-20 Mg exhibits excellent catalytic performance and prominent electrochemical stability with a low overpotential of 220 mV to reach current density of 10 mA cm^(-2),a small Tafel slope of 59.0 mV dec^(-1) and long-term durability for 24 h in 1.0 M *** results of microstructure and element states indicate that crystal defects,porous structure and villous hydroxides are the reasons for high OEr performance of the *** work not only provides a new way to prepare electrocatalysts,but also proves the important application of high entropy alloys in functional materials.

关键词： CoCrFeNiMo High entropy alloys Electrocatalysts Oxygen evolution reaction Microwave sintering Mg space holder

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