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Microspheres trigged-stress concentration regulating piezoelectric properties of PVDF/elastomer composites

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Sc.ence china chemistry 2025年

作者： Wenxian Zhang Jiahong Yang Qijun Sun Lu Peng Tong lin Shouke Yan Xiaoli Sun State Key Laboratory of chemical Resource engineering Beijing University of Chemical Technology Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences State Key Laboratory of Separation Membranes and Membrane Processes School of Textile Science and EngineeringTiangong University Key Laboratory of Rubber-Plastics of Ministry of Education Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science & Technology

Wearable self-powered piezoelectric pressure sensors are attracting tremendous ***,fabricating a high-sensitive elastic piezoelectric sensor for a broad response range remains ***,we assemble polar poly（vinylidene fluoride）(PVDF) microsphere-elastomer composites,achieving high-sensitive and wide-responsive pressure *** polar PVDF microspheres are produced cost-effectively through phase separation,enabling *** piezoelectric composite （Pc） film demonstrates low Young’s modulus,and excellent anti-fatigue ***,the Pc-based piezoelectric sensor exhibits a rather high sensitivity of 540 mV N-1in a wide sensing range （5–40 N）,240 times greater than the PVDF film-based sensor and comparable to the inorganic piezoelectric *** excellent performance is attributed to the highest average stress concentration on the spherical PVDF coupled with the remarkable deformation of dipoles of spherical PVDF in the flexible *** on excellent performance,this piezoelectric sensor achieves precise recognition of motions and sound *** high-sensitive flexible piezoelectric sensor enabling large area production with ultralow price exerts great potential in smart monitoring and intelligent robots.

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Analyses of the predicted changes of the global oceans under the increased greenhouse gases scenarios

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chinese Sc.ence Bulletin 2006年第21期51卷 2651-2656页

作者： MU lin WU Dexing c.en Xue'en Jungclaus Physical Oceanography Laboratory Ocean University of ChinaQingdao 266003 China Institute of Oceanography Hamburg University Hamburg 20146Germany Max-Planck Institute for Meteorology Hamburg 20146 Germany

A new climate model (EcHAM5/MPI-OM1) developed for the fourth assessment report of the Intergovernmental Panel on climate change (IPcc) at Max-Planck Institute for Meteorology is used to study the climate changes under the different increased cO2 scenarios (B1, A1B and A2). Based on the corresponding model results, the sea surface temperature and salinity structure, the variations of the thermohaline circulation (THc) and the changes of sea ice in the northern hemisphere are analyzed. It is concluded that from the year of 2000 to 2100, un- der the B1, A1B and A2 scenarios, the global mean sea surface temperatures (SST) would increase by 2.5℃, 3.5℃ and 4.0℃ respectively, especially in the region of the Arctic, the increase of SST would be even above 10.0℃; the maximal negative value of the variation of the fresh water flux is located in the sub- tropical oceans, while the precipitation in the eastern tropical Pacific increases. The strength of THc de- creases under the B1, A1B and A2 scenarios, and the reductions would be about 20%, 25% and 25.1% of the present THc strength respectively. In the north- ern hemisphere, the area of the sea ice cover would decrease by about 50% under the A1B scenario.

关键词：温室气体 THc 气候模型 IPcc

A simplified method for reconstituting active *** DNA polymerase Ⅲ

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Protein & cell 2011年第4期2卷 303-307页

作者： Shi-Qiang lin Li-Jun Bi Xian-en Zhang National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China State Key Laboratory of Virology Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071Hubei provinceChina Graduate School Chinese Academy of SciencesBeijing 100039China

Genome duplication in *** is carried out by DNA polymeraseⅢ,an enzyme complex consisting of ten *** of the biochemical and structural properties of DNA polymeraseⅢrequire the expression and purification of subunits includingα,ε,θ,γ,δ′,δ,andβseparately followed by in vitro reconstitution of the polⅢcore and clamp *** we propose a new method for expressing and purifying DNA polymeraseⅢcomponents by utilizing a protein coexpression *** results show that the subunits of the polⅢcore and those of the clamp loader can be coexpressed and purified based on inherent interactions between the *** resulting polⅢcore,clamp loader and sliding clamp can be reconstituted effectively to perform DNA *** strategy considerably simplifies the expression and purification of DNA polymeraseⅢand provides a feasible and convenient method for exploring other multi-subunit systems.

关键词： E.coli DNA polymeraseⅢ coexpression purification

Numerical Analysis of Fluctuation Behavior of Steel/Slag Interface in continuous casting Mold with Static Magnetic Field

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Journal of Iron and Steel Research International 2014年第9期21卷 809-816页

作者： An-yuan DenG lin XU en-gang WANG Ji-c.eng HE Key Laboratory for Electromagnetic Processing of Materials of Ministry of Education Northeastern University

Utilizing ANSYS cFX commercial software and volume fraction of fluid （VOF） model, fluctuation behav- ior of steel/slag interface was numerically simulated in continuous casting mold with static magnetic field, and the influence of metal jet characteristics on the behavior of steel/slag interface was investigated. The results indicated that the behavior of steel/slag interface is similar at different process parameters, which is closely related to the characteristic of the flow field. The steel/slag interface has an obvious trough characteristic, which can be divided in- to three zones： frontal valley zone, back valley zone and horizontal zone~ as the magnetic flux density increases, the fluctuation of liquid level increases firstly and then decreases, and a reasonable magnetic flux density can make steel/ slag interface obtain a relatively flat interface, which can prevent slag from being entrapped into liquid steel. For a thin slab continuous casting process, when the casting speed is 4 m/min, a reasonable magnetic flux density is about 0.5 T, and the interfacial fluctuation is weaker. No matter the position of magnetic field is horizontal or vertical, for different operating parameters, there is a corresponding reasonable magnetic field position where the steel/slag inter- face fluctuation can be properly controlled and slag entrapment can be prevented.

关键词： continuous casting steel/slag interface static magnetic field metal jet slag entrapment

Hydrothermal Synthesis, Structural characterization and Properties of Mixed Valent Decavanadium Oxide [co_2cl_8V_(10) O_(18)(H_2O)]cl_2·6H_2O with Novel Three-dimensional Framework

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chemical Research in chinese Universities 2003年第2期19卷 135-139页

作者： WU Ping song XU lin WANG en bo HU chang wen Faculty of chemistry Northeast Normal UniversityChangchun 130024P.R.China

Decavanadium oxide [co 2cl 8V 10 O 18 (H 2O)]cl 2·6H 2O was synthesized hydrothermally with NH 4VO 3, Na 2MoO 4·2H 2O, H 3PO 4(85%), cocl 2·6H 2O and hexamethylenetetraamine. The X ray diffraction analysis showed that [co 2cl 8V 10 O 18 (H 2O)]cl 2·6H 2O crystallized in a monoclinic crystal system, the space group was c2/m with cell parameters a =1 6065(3) nm, b =2 2699(5) nm, c =1 3897(3) nm, β = 125.29(3)°, V =4 1363(14) nm 3, Z =2 and the final R =0 06, wR =0 1926. Its crystal structure is a 3 D open framework constructed by VO x polyhedra and cocl 4 tetrahedra with channels along the crystallographic axes a, b, and c .

关键词： Hydrothermal synthesis Polyoxometalate crystal structure

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《庄子》精神生态隐喻的英译叙事重构

东北师大学报（哲学社会科学版） 2025年第1期 134-142页

作者：周桂君林琳东北师范大学外国语学院吉林长春130024 沈阳化工大学外国语学院辽宁沈阳110142

隐喻言说是《庄子》话语特色之一,其中不乏体现主体与其生存环境同构互动的精神生态隐喻。本文对此种隐喻进行界定并提出识别程序,选取《庄子》精神生态隐喻英译实例,探究何种叙事重构方法能将《庄子》原文有关精神生态的隐喻叙事内容... 详细信息

隐喻言说是《庄子》话语特色之一,其中不乏体现主体与其生存环境同构互动的精神生态隐喻。本文对此种隐喻进行界定并提出识别程序,选取《庄子》精神生态隐喻英译实例,探究何种叙事重构方法能将《庄子》原文有关精神生态的隐喻叙事内容更好地被译入语读者群接受并认可,进而将原文的精神生态内涵在异域文化中得以传递。《庄子》精神生态隐喻主要有喻体源于自然意象和非自然意象等两类。前者的英译可遵照选择性采用的诗化叙事重构方法,后者的英译宜采取人物事件再定位的语境重构策略。聚焦《庄子》中精神生态隐喻的译介叙事重构研究,可对以生态思想外译为导向的《庄子》英译实践与研究提供参考。

关键词：精神生态隐喻隐喻识别叙事重构选择性采用人物事件再定位

Development of a micro gas turbine combustor with T-type vaporizers

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航空动力学报 2007年第7期22卷 1118-1126页

作者： XU Quan-hong LIU Jun XU Jian lin Yu-zhen LIU Gao-en National Key Laboratory on Aero-engines School of Jet PropulsionBeijing 13niversity of Aeronautics and Astronautics Beijing 100083 China

The study includes the experimental investigation of the evaporation performance of T-type vaporizer,mainly studied the relationship of the inlet air temperature and vaporizer wall temperature with the evaporation ***,it studied the LBO(lean blow out) and combustion effic.ency of the micro aero-engine combustor with T-type vaporizer on the normal pressure test *** inlet air condition is environmental pressure and *** gas analysis method is used to study the combustion effic.ency,and the inlet air temperature is 300 K,400 K and 500 *** could be concluded that the evaporation performance is improved with the increasing of the inlet air temperature and vaporizer wall temperature;the average LBO is 0.003;the combustion effic.ency rises with the inlet air temperature,and it remain constant when the fuel/air ratio changed in the range from 0.008 to *** vaporization ratio is the key factor to determine the combustion performance.

关键词：离心式喷气发动机燃烧室喷雾器索特平均直径燃气涡轮

Artificially regulated synthesis of nanocrystals in live cells

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National Sc.ence Review 2022年第6期9卷 189-199页

作者： An-An Liu en-Ze Sun Zhi-Gang Wang Shu-lin Liu Dai-Wen Pang State Key Laboratory of Medicinal chemical Biology Tianjin Key Laboratory of Biosensing and Molecular Recognition Frontiers Science Center for New Organic MatterResearch Center for Analytical SciencesCollege of ChemistrySchool of MedicineFrontiers Science Center for Cell Responses Nankai University college of chemistry and Molecular Sc.ences Wuhan University

Live cells, as reservoirs of biochemical reactions, can serve as amazing integrated chemical plants where precursor formation, nucleation and growth of nanocrystals, and functional assembly, can be carried out accurately following an artificial program. It is crucial but challenging to deliberately direct intracellular pathways to synthesize desired nanocrystals that cannot be produced naturally in cells, because the relevant reactions exist in different spatiotemporal dimensions and will never encounter each other *** article summarizes the progress in the introduction of inorganic functional nanocrystals into live cells via the ‘artificially regulated space–time-coupled live-cell synthesis’ strategy. We also describe ingenious bio-applications of nanocrystal–cell systems, and quasi-biosynthesis strategies expanded from live-cell synthesis. Artificially regulated live-cell synthesis—which involves the interdisciplinary application of biology, chemistry, nanosc.ence and medicine—will enable researchers to better exploit the unanticipated potentialities of live cells and open up new directions in synthetic biology.

关键词： cell synthesis nanocrystal quantum dot artificial metabolism

Mechanical properties and microstructures of Mg-6Si alloys fabricated using the tungsten-inert-gas arc additive manufacturing

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china Foundry 2025年

作者： Peng-c.eng Zhou Guo-qiang You Jin-yu Feng Lei Wang Xiao lin Bin Jiang college of Materials Sc.ence and engineering Chongqing University National engineering Research center for Magnesium Alloys Chongqing University National Key Laboratory of Advanced casting Technologies Chongqing University

Si-containing Mg alloys solidified at conventional rates often contain coarse and sharp Mg2Si phases,which can result in inferior material *** this study,Mg-6wt.%Si （Mg-6Si） alloy was prepared by wire arc additive manufacturing （WAAM）,employing the gas tungsten arc welding technique with rapid *** microstructures and mechanical properties of the WAAM alloy were investigated and compared with those of the as-cast samples produced using a metal *** results indicate that the WAAM Mg-6Si is harder and stronger than the as-cast *** microhardness of the WAAM Mg-6Si increases by 36.6%in comparison to that of as-cast Mg-6Si ***,the average tensile strengths at room temperature and 150°c increases by 63.4%and 21.3%,*** refines both the Mg2Si phase and the overall grains,resulting in a homogeneous morphology and improved mechanical *** granular Mg2Si phase,characterized by fine particles with a diffused distribution,shows a significant increase in *** acicular Mg2Si phase is distributed along the grain boundaries,and its concentration significantly *** average grain size of the Mg2Si phase is about 9.20μm,about 5 times *** refinement and distribution of the granular Mg2Si phase,as well as the reduction in the amount of needle-like Mg2Si particles,are the key factors for improving the mechanical properties of WAAM Mg-6Si alloy.

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