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On the molecular mechanism of ion specific Hofmeister series

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Science China Chemistry 2014年第1期57卷 36-47页

作者： xie wenjun LIU ChengWen YANG LiJiang GAO YiQin Peking National Laboratory for Molecular Sciences Institute of Theoretical and Computational Chemistry College of Chemistry and Molecular Engineering Peking University

Hofmeister series ranks the ability of salt ions in influencing a variety of properties and processes in aqueous *** this review,we reexamine how these ions and some other small molecules affect water structure and thermodynamic properties,such as surface tension and protein backbone *** illustrate the difficulties in interpreting the thermodynamic information based on structural and dynamic *** an alternative,we show that the solvation properties of ions and proteins/small molecules can be used to explain the salt effects on the thermodynamic properties of the *** analysis shows that the often neglected cation-anion cooperativity plays a very important role in these *** also argue that the change of hydrogen donor/acceptor equilibrium by added cosolutes/cosolvents can be used to explain their effects on protein secondary structure denaturation/protection:those increase hydrogen donor concentrations such as urea and salts with strongly solvated cations/weakly hydrated anions tend to dissolve protein backbone acting as secondary structure denaturants,whereas those lack of hydrogen donors but rich in acceptors have the opposite effect.

关键词： Hofmeister series,salt effects,ion cooperativity,hydrogen donor acceptor equilibrium,surface tension,protein dena-turant,protein protectant

Dynamic solidification of Sn-38.1% Pb eutectic alloy within ultrasonic field

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Chinese Science Bulletin 2011年第1期56卷 89-95页

作者： ZHAI Wei HONG ZhenYu xie wenjun WEI BingBo Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

The dynamic solidification of Sn-38.1% Pb eutectic alloy within an ultrasonic field is investigated at a frequency of 35 *** the sample height H is reduced,the effect of ultrasound on macrosegregation becomes more prominent,and the volume fraction of spherical eutectic cells increases *** H equals the wavelength λ in liquid alloy,the introduction of ultrasound enlarges the distribution region of the primary (Sn) phase,but reduces the domains of the Sn-Pb eutectic and primary (Pb) ***,a "dendritic-equiaxed" structural transition occurs in the primary (Sn) phase,and its grain size is significantly reduced within the ultrasonic *** H decreases to λ/2 and λ/4,the ultrasonic field promotes crystal nucleation and suppresses further undercooling of the bulk liquid *** analyses indicate that the local high pressure induced by the cavitation effect and the stirring effect due to acoustic streaming are the main factors dominating the eutectic growth mechanism during dynamic solidification.

关键词：共晶合金动态凝固超声场 Sn Pb 体积分数宏观偏析液态合金

Solidification characteristics of Pb-Sb hypereutecticalloy within ultrasonic field

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Chinese Science Bulletin 2007年第6期52卷 844-848页

作者： ZHAI Wei HONG ZhenYu xie wenjun WEI BingBo Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

The solidification of Pb-16%Sb hypereutectic alloy is investigated within ultrasonic field with a fre-quency of 15 kHz. It is found that the ultrasonic field promotes crystal nucleation and terminates the further bulk undercooling of the alloy melt. Theoretical analysis shows that the cavitation effect and the forced bulk vibration are the main factors that reduce the undercooling level. With the increase of ul-trasound intensity, the primary (Sb) phase experiences a growth mode transition from faceted to non-faceted branched growth, and the macrosegregation of primary (Sb) phase is gradually sup-pressed. In addition, the microstructures of Pb-Sb eutectic exhibit a conspicuous coarsening with in-creasing ultrasound intensity, and a structural transition of “lamellar eutectic—anomalous eutectic” occurs when ultrasound intensity rises up to 1.6 W/cm2. The ultrasonic field also changes the solute distribution adjacent to the solidification front, which lowers the Pb contents in primary (Sb) phase.

关键词：铅-锑过共晶合金超声场凝固特性空化效应强制振动

The liquid phase separation of Bi-Ga hypermonotectic alloy under acoustic levitation condition

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Chinese Science Bulletin 2007年第11期52卷 1446-1450页

作者： HONG ZhenYu LV YongJun xie wenjun WEI BingBo Department of Applied Physics Northwestem Polytechnical University Xi'an 710072 China

Containerless treatment of Bi-58.5at%Ga hypermonotectic alloy is successfully performed with acous-tic levitation technique. Under acoustic levitation condition,the second phase (Ga) distributes almost homogeneously in solidification sample,opposite to macrosegregation in solidification sample under conventional condition. Stokes motion of the second liquid droplet (Ga) is significantly restrained un-der acoustic levitation condition. The analyses indicate that the melt vibration in the gravity direction forced by acoustic field can induce steady flow around the second liquid droplet,which influences droplet shape during its moving upward and consequently restrains Stokes motion velocity of the second liquid droplet.

关键词：声悬浮高导磁率合金液相分离斯托克司运动光谱运动

The ninth-mode sectorial oscillation of acoustically levitated drops

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Chinese Science Bulletin 2011年第31期56卷 3284-3288页

作者： YAN ZhenLin xie wenjun GENG DeLu WEI BingBo Department of Applied Physics Northwestern Polytechnical University Xi＇an 710072 China

We report on the ninth-mode sectorial oscillation of acoustically levitated drops excited by actively modulating sound pressure. A numerical computation based on the level set method was performed to model drop shape evolution by solving an incompressible two-phase flow problem. The calculated shapes of the oscillating drop are in good agreement with experimental observations. The relationship between the oscillation frequency and parameters describing the flattened drops is studied both experimentally and numerically. The frequency of the ninth-mode sectorial oscillation decreases with increasing equatorial radius and can be well-described by a modified Rayleigh equation.

关键词：振荡频率扇形悬浮声学 Rayleigh方程数值计算模型实验观察水平集方法

A novel stochastic reaction-diffusion model of Ca^2＋ blink in cardiac myocytes

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Science Bulletin 2017年第1期62卷 5-8页

作者： Jinghui Li wenjun xie Xi Chen Yunlong Huo Heping Cheng Wenchang Tan state key laboratory of turbulence and complex systems and department of mechanics and engineering science college of engineeringpeking universityBeijing 100871China institute of molecular medicine and national laboratory of biomembrane and membrane biotechnology peking universityBeijing 100871China shenzhen graduate school peking universityShenzhen 518055China

In cardiac myocytes,the sarcoplasmic reticulum(SR)is the main storage organelle of free Ca^(2+).The concentration of free Ca^(2+)in the SR is 0.5–1.0 mmol/L and is 2–3 orders of magnitude greater than that in the *** SR is composed of interconnected cisternae(junctional SR,i.e.,JSR)and tubules(free SR network,i.e.,FSR)that extend throughout the cytosol[1].Ca^(2+)is released from the JSR into the cytosol via Ca^(2+)release units(CRUs,

关键词：心肌细胞反应扩散模型随机 Ca2+ 钙贮存器细胞内肌浆网

Topsoil dichlorodiphenyltrichloroethane and polychlorinated biphenyl concentrations and sources along an urban-rural gradient in the Yellow River Delta

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Journal of Environmental Sciences 2012年第9期24卷 1655-1661页

作者： wenjun xie Aiping Chen Jianyong Li Qing Liu Hongjun Yang Tao Wu Zhaohua Lu Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Binzhou University Binzhou 256603 China. Institute of Restoration Ecology China University of Mining and Technology Beijing 100083 China Jinan Entry-Exit Inspection and Quarantine Bureau Jinan 250000 China

The Yellow River Delta （YRD） is a typical agricultural and petrochemical industrial area of China. To assess the current status of soil dichlorodiphenyltrichloroethane （DDT） and polychlorinated biphenyls （PCB） residues, topsoil samples （0-15 cm）（n = 82） were collected in Bincheng District, at the geographic center of the YRD. The total concentrations of six DDT homologues were within 3.3-3819 ~tg/kg, with a mean concentration of 191 ~tg/kg, showing significant increase along urban-rural gradient. Soil concentrations of seven indicator PCBs in the area ranged from non-detectable to 87.0 ~g/kg, dominated by heavily chlorinated PCBs （PCB-101 and -118）. Soil PCBs concentrations were significantly greater in urban than suburban and rural areas. Principal component and multiple linear regression analysis suggest that 86.4% of soil DDTs originate from past DDT usage, and 13.6% originate from dicofol application. Soil PCBs most likely originate from the petrochemical industry （77.1%）, municipal solid waste disposal （16.5%）, local commercial PCB homologues usage （5.2%）, and long-range atmospheric deposition （1.2%）. In general, soil DDTs pollution was classified as low level, and mean PCBs concentrations were below the severe contamination classification range. Because PCB-118 is a dioxin-like congener, monitoring and remediation is advised to assess and reduce negative environmental and human health effects from soil DDTs and dioxin-like congeners in the study area.

关键词： DDTs PCBs Yellow River Delta source apportionment risk assessment

Audio2AB:Audio-driven collaborative generation of virtual character animation

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虚拟现实与智能硬件（中英文） 2024年第1期6卷 56-70页

作者： Lichao NIU wenjun xie Dong WANG Zhongrui CAO Xiaoping LIU School of Computer Science and Information Engineering Hefei University of TechnologyHeifei 230009China School of Software Hefei University of TechnologyHeifei 230009China Anhui Province Key Laboratory of Industry Safety and Emergency Technology Hefei University of TechnologyHefei 230601China

Background Considerable research has been conducted in the areas of audio-driven virtual character gestures and facial animation with some degree of ***,few methods exist for generating full-body animations,and the portability of virtual character gestures and facial animations has not received sufficient *** Therefore,we propose a deep-learning-based audio-to-animation-and-blendshape(Audio2AB)network that generates gesture animations and ARK it's 52 facial expression parameter blendshape weights based on audio,audio-corresponding text,emotion labels,and semantic relevance labels to generate parametric data for full-body *** parameterization method can be used to drive full-body animations of virtual characters and improve their *** the experiment,we first downsampled the gesture and facial data to achieve the same temporal resolution for the input,output,and facial *** Audio2AB network then encoded the audio,audio-corresponding text,emotion labels,and semantic relevance labels,and then fused the text,emotion labels,and semantic relevance labels into the audio to obtain better audio ***,we established links between the body,gestures,and facial decoders and generated the corresponding animation sequences through our proposed GAN-GF loss *** By using audio,audio-corresponding text,and emotional and semantic relevance labels as input,the trained Audio2AB network could generate gesture animation data containing blendshape ***,different 3D virtual character animations could be created through *** The experimental results showed that the proposed method could generate significant gestures and facial animations.

关键词： Audio-driven Virtual character Full-body animation Audio2AB Blendshape GAN-GF

Microgravity Material Research in China:2016

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空间科学学报 2016年第5期36卷 805-814页

作者： xie wenjun LUO Xinghong ZHANG Xingwang YU Yude North Western Polytechnical University Xi'an 710072 Institute of Metal Research Chinese Academy of SciencesShenyang 110016 Institute of Semiconductors Chinese Academy of SciencesBeijing 100083

Firstly,recent research works of high undercooling and rapid solidification of metallic alloys under ground simulation conditions in Northwestern Polytechnical University are ***,under normal gravity and microgravity of binary to quinary Nickel-base single crystal alloys with different contents of W,Ta,Al and Ti elements are comparatively investigated by Institute of Metal Research using drop ***,solidification and crystal growth of SJ10-Recoverable Scientific Experiment Satellite by Institute of Semiconductors is introduced.

关键词：微重力材料中国西北工业大学镍基单晶合金科学试验卫星快速凝固金属合金