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| 1 | 以颜色和形状直方图为线索的粒子滤波人脸跟踪显示文摘跟踪器的设计和跟踪线索的选择与表达是人脸跟踪中的两大关键因素,针对一般人脸跟踪算法中常用简单椭圆来描述人脸形状线索时易受背景干扰的缺点,以及视频目标跟踪中动态模型和观测模型的非线性非高斯特点,提出了一种以颜色和形状直方图为线索的粒子滤波人脸跟踪算法,该算法在粒子滤波基本框架之下,引入了一种新的用直方图来描述人脸形状的方法,并对其进行了改进,用来作为人脸跟踪的形状线索。同时,为了减轻背景干扰,提出了一种经验有效边缘的检测方法。实验表明,该跟踪方法不仅能有效地处理人脸旋转、背景中的肤色干扰和部分遮掩问题,并且能够在由于大面积遮掩等原因而丢失目标的情况下,及时有效地重新捕获已丢失的目标。 | 高建坡 王煜坚 杨浩 吴镇扬 | 2007 | 中国图象图形学报2007，12，3： | 11 |
| 2 | Facile synthesis of ultrathin metal-organic framework nanosheets for Lewis acid catalysis显示文摘Ultrathin metalorganic framework (MOF) nanosheets are attracting great interest in catalysis due to their unique and intriguing two-dime nsional (2D) features. Although many progresses have been achieved, it is still highly desirable to develop novel strategies for controllable synthesis of the well-defined ultrathin MOF nanosheets. Herein we report a polyvinylpyrrolidone (PVP)-assisted route to synthesize the ultrathin Ni-MOF nanosheets characteristic of 1.5 nm in thickness, in which PVP is reacted with 2-aminoterephthalic acid (H2BDC-NH2) via formation of C=N bon d, followed by coord inatio n with Ni2+ io ns to form the ultrathi n MOF n anosheets. Impressively, when used in the Kno eve nagel condensation reactions of propane dinitrile with different aldehydes, ultrathin Ni-MOF nanosheets display the significantly enhanced catalytic activity and good stability in respect with the bulk Ni-MOF, mainly owing to the exposed active sites as well as facile mass transfer and diffusion of substrates and products. | Xiaofei Zhang Lin Chang Zhongjie Yang Yanan Shi Chang Long Jianyu Han Binhao Zhang Xueying Qiu Guodong Li Zhiyong Tang | 2019 | Nano Research2019，12，2： | 11 |
| 3 | Sustaining enhanced condensation on hierarchical mesh-covered surfaces显示文摘Controlling the solid–liquid–vapor tri-phase interface is of fundamental importance for a broad range of industrial applications including biomedical engineering, energy production and utilization, environmental control, water production, and thermal management. Although a lot of progress has been made over the past few decades on surface manipulation for promoting droplet removal, it is challenging to accelerate both droplet growth and surface refreshing for enhancing vapor-to-liquid condensation. Here we present a superhydrophobic hierarchical mesh-covered(hi-mesh) surface to enable continuous sucking flow of liquid condensate, which achieves fourfold-higher droplet growth and 36.8% faster surface refreshing compared to the state-of-the-art dropwise condensation. Unprecedented enhanced condensation heat transfer is observed to be sustained over a wide range of surface subcooling on the hi-mesh surfaces. This demonstration of sustained enhanced condensation enhancement is not only of fundamental scientific importance, but also provides a viable strategy for large-scale deployment of micro/nanostructured surfaces in a diverse range of technologies. | Rongfu Wen Shanshan Xu Dongliang Zhao Lixin Yang Xuehu Ma Wei Liu Yung-Cheng Lee Ronggui Yang | 2018 | National Science Review2018，5，6： | 9 |
| 4 | THE CASE STUDY ON THE EFFECT OF CO_2 IN CAVE ATMOSPHERE ON STABILITY OF SPELEOTHEM SCENERY IN YAOLIN CAVE, ZHEJIANG PROVINCE, CHINA显示文摘Because of the development of tourist activities and the facilities in the show cave, the closed system of show cave has been changed into the complicated open system. The great number of the visitors and the landscape lights give great deal of thermoenergy to the show cave system, especially the high intensive lights make the temperature nearby goes up very fast and reduce the humidity. After the visitors leaving and the lights switching off, the temperature goes down and humidity increases even upto saturation, the condensation taken place. In the dry seasons, the cave humidity is relative low, even down to 40 50 percent. The administrations of show cave rushes the water to clean the touristic trails and keep the high humidity as to protect the cave environment. Under the function of artificial readjustment, the humidity of Yaolin cave atmosphere reaches to 97-100 percent throughtout the year. | Song Linhua Yang Jingrong Lin Junshu Group of Karstology and Speleology, Institute of Geography, CAS, Beijing 100101 People’s Republic of ChinaWang Laihong Administration of Yaolin Cave, Tonglu County, Zhejiang Province, 311500 People’s Republic | 1997 | Journal of Geographical Sciences1997，7，3： | 8 |
| 5 | Experimental study on pressure and temperature distributions for low mass flux steam jet in subcooled water显示文摘A low mass flux steam jet in subcooled water was experimentally investigated.The transition of flow pattern from stable jet to condensation oscillation was observed at relatively high water temperature.The axial total pressures,the axial and radial temperature distributions were measured in the jet region.The results indicated that the pressure and temperature distributions were mainly influenced by the water temperature.The correlations corrected with water temperature were given to predict the dimen-sionless axial pressure peak distance and axial temperature distributions in the jet region,the results showed a good agreement between the predictions and experiments.Moreover,the self-similarity property of the radial temperature was obtained,which agreed well with Gauss distribution.In present work,all the dimensionless properties were mainly dependent on the water temperature but weakly on the nozzle size under a certain steam mass flux. | JunJie Yan XinZhuang Wu DaoTong Chong | 2009 | Science China(Technological Sciences)2009，52，6： | 7 |
| 6 | Heat Transfer in Flue Gas with Vapor Condensation显示文摘This paper combines the film model with Nusselt’s condensation theory to analyze the effects of water vapor condensation on the heat transfer performance of flue gas flowing through a vertical tube. The analysis compares the condensation and convective heat transfer rates. For the concentration range investigated, the water vapor condensation transfers more energy than the flue gas convection, but the convective heat transfer can not be neglected. The heat transfer intensification due to the condensation increased as the water vapor fraction increased. The theoretical results compared well with experimental data. | 贾力 彭晓峰 | 2002 | Tsinghua Science and Technology2002，7，2： | 5 |
| 7 | Formation regularity of phases in nanometer powders of Al-Fe alloy prepared by gas evaporation显示文摘Nanometer powders of Al Fe alloy were prepared by gas evaporation. The formation regularity of the phases in the as prepared powders and the morphology of the particles were examined. The experimental results show that chemical composition of the master alloy is the key factor which controls the chemical composition of the compound phases in nanometer powders at given evaporating temperature, the compound phases with high Fe mole fraction will form with increasing of Fe content in master alloy. Only Al 13 Fe 4, FeAl 2 and Al 2Fe compound phases form in nanometer powders in present experiment, changing of the pressure of Ar can only alter relative amounts of the compound phases in the powders. Nanometer particles with inhomogeneous tissue were obtained, which is very different from that of pure Al and Fe nanometer particles. When mole fraction of Fe in particles increases, the inhomogeneity is enhanced. [ | 严红革 陈振华 康智涛 袁武华 孙亦 黄培云 | 2000 | 中国有色金属学会会刊:英文版2000，10，5： | 5 |
| 8 | Production of magnesium during carbothermal reduction of magnesium oxide by differential condensation of magnesium and alkali vapours显示文摘Most of researchers believed that the developments on the condensation of magnesium produced by carbothermic reduction just concentrated on two process routes:the“quench”route and the“solvent”route.But this paper will briefly analyzes the major challenges in magnesium vapor condensation during the vacuum carbothermic reduction of calcined dolomite,on equipment upgrade,heat transfers alter,to achieve condensation control and production collection.Solutions are then proposed using theoretical calculations and experiment results.Comparative analysis of the experiment results shows that the burning and even explosion of condensation products during the vacuum carbothermic reduction of calcined dolomite are mainly due to the burning of crystallized powder magnesium,which results from the self-ignition of alkali metals.Finally,this paper proposes a multistage condensation solution to improve traditional vacuum condensation equipment.And result show that the condensation equipment can effectively mitigate the burning and loss during condensation,also the morphology of the condensation products clearly improved,the grain size increased,and the oxidation rate decreased.The potassium/sodium vapor and the magnesium vapor were separately condensed. | Cheng-bo Yang Yang Tian Tao Qu Bin Yang Bao-qiang Xu Yong-nian Dai | 2013 | Journal of Magnesium and Alloys2013，1，4： | 5 |
| 9 | 视频中遮挡情况下目标的跟踪显示文摘提出了一种基于概率外观模型和Condensation的跟踪方法。该方法通过分析目标前景MBB重叠关系检测遮挡的产生和解除,在目标未遮挡时建立并更新目标的概率外观模型。当遮挡发生后,利用目标共面条件确定目标前后关系,通过合并目标模型计算系统观测似然度概率。算法统一在Condensation框架下进行有遮挡和无遮挡的跟踪。实验证明了该方法的有效性。 | 梁华 刘云辉 | 2008 | 计算机应用研究2008，25，3： | 5 |
| 10 | Film condensation heat transfer on a vertical porous-layer coated plate显示文摘Film condensation on a vertical porous coated plate is investigated numerically for a porous/fluid composite system based on the dispersion effect in the porous coating. The mathematical model improves the conventional matching conditions by considering the stress force at the porous coating interface. The numerical results show the effects of the porous coating thickness, the effective thermal conductivity and the permeability on condensate film thickness and local Nusselt number. The predicted average Nusselt number has similar tendencies to experimental results reported in literature, such that using a thin porous coating would be a viable alternative for enhancing the condensation heat transfer. | 马学虎 王补宣 | 1998 | Science China(Technological Sciences)1998，41，2： | 4 |
| 11 | Gram-scale preparation of dialkylideneacetones through Ca(OH)_2-catalyzed Claisen-Schmidt condensation in dilute aqueous EtOH显示文摘A synthetic method of dialkylideneacetones has been developed. Compared with known protocols, the method employed catalytic Ca(OH)_2 as the cheap, mild base catalyst and dilute aqueous EtOH(20%, v/v)as the green and safe solvent. The procedure was easily operated: In most cases, the product could be isolated by a simple filtration, and purified by washing with water. This paper provided experimental details of the reactions, which could be applied in gram-scale synthesis and should be a very reliable and practical protocol to prepare these useful compounds in laboratory and at the industrial level. | Hao Zhang Mengting Han Chenggen Yang Lei Yu Qing Xu | 2019 | Chinese Chemical Letters2019，30，1： | 4 |
| 12 | Magnesium production by carbothermic reduction in vacuum显示文摘In present work,we investigate production of magnesium by carbothermic reduction under vacuum conditions.The process was divided into two parts,one is reduction process,and the other one is condensation process.The experimental results revealed that during reduction process,the gas-solid reaction between MgO and CO was not occurred at a temperature and pressure of 1723 K and 30-100 Pa respectively.So the main reduction reaction was MgO(_(s))+C(_(s))=Mg(_(g))+CO(_(g))(under vacuum)and reaction type belonged to solid-solid reaction.In Condensation Process,according to a contrast and analysis,the condensation quality of magnesium is associated with CO concentration.The resultant product C was formed and it followed magnesium vapor condensation which prevents mutual combination of two metal droplets to forms the compact condensation produces.Therefore,in order to compact morphological forms of magnesium crystal whiskers,we must control the technical conditions and find the method to separate the magnesium vapor and carbon monoxide.That's the key factor to get better crystalline structure. | Yang Tian Bao-qiang Xu Bin Yang Cheng-b Yang Tao Qu Da-chun Liu Yong-nian Dai | 2015 | Journal of Magnesium and Alloys2015，3，2： | 4 |
| 13 | Filmwise Condensation Heat Transfer Enhancement with Dropwise and Filmwise Coexisting Condensation Surfaces显示文摘Six surfaces were prepared with defferent surface division patterns for the experimental investigationof steam condensation heat transfer characteristics for dropwise and filmwise coexisting(DFC)condensationsurfaces under atmospheric pressure Dropwise condensation(DWC)was promoted with an ultrathin polytetrafluoroethylene(PTFE)film,which was prepared by the dynamic ion-beam mixed implantation(DIMI)method.The results showed that the condensation phenomena at the intersection between the dropwise andfilmwise condensation regios were quite different for different relative positions of the dropwise and filmwisecondensation regions.The experimental results revealed that the condensation heat transfer characteristics werehighly influenced by the surface division number and the relative area ratio of the dropwise and filmwise conden-sation regions.The impact of thesc findings on heat transfer enhancement mechanism for condensation heattransfer is discussed in detail. | 马学虎 王补宣 徐敦颀 林纪方 | 1998 | Chinese Journal of Chemical Engineering1998，6，2： | 4 |
| 14 | Influences of friction drag on spontaneous condensation in water vapor supersonic flows显示文摘A mathematical model was developed to investigate the water vapor spontaneous condensation under supersonic flow conditions. A numerical simulation was performed for the water vapor condensable supersonic flows through Laval nozzles under different flow friction conditions. The comparison between numerical and experimental results shows that the model is accurate enough to investigate the supersonic spontaneous condensation flow of water vapor inside Laval nozzles. The influences of flow friction drag on supersonic spontaneous condensation flow of water vapor inside Laval nozzles were investigated. It was found that the flow friction has a direct effect on the spontaneous condensation process and therefore it is important for an accurate friction prediction in designing this kind of Laval nozzles. | JIANG WenMing LIU ZhongLiang LIU HengWei PANG HuiZhong BAO LingLing | 2009 | Science China(Technological Sciences)2009，52，9： | 4 |
| 15 | STUDIES ON THE PRENYLFLAVONOIDS PART V.SYNTHESIS OF(±)LESPEDEZAFLAVANONE D显示文摘(±)Lespedezaflavanone D,8,5’-di(γ,γ-dimethylallyl)-5,7,2’,4’-tetrahydroxyflavanone,hasbeen synthesized by the condensation of 4,6-dimethoxymethoxy-3-(γ,γ-dimethylallyl)-2-hydroxy-acetophenone with 2,4-dimethoxymethoxy-5-(γ,γ-dimethylallyl)benzaldehydc followed by cyclization anddemethoxymethylation. | Fang Jie ZHANG Hua Wu SHAO Yu Lin LI Satate key Laboratory of Applied Organic Chemistry,Lanzhou University,Lanzhou 730000 | 1993 | Chinese Chemical Letters1993，4，4： | 4 |
| 16 | Intramolecular Induction of Asymmetric Darzen's Condensation of Aldehydes with Chiral α-Chloroacetates显示文摘The asymmetric Darzen’s condensation of aldehydes with a-chloroacetates of somenaturally occurring or synthetic chiral alcohols was described. The de% of products fell over therange of 4. 78% to 99%. | Guo Bin HUANG Gan Feng CAO Ke Met WU Liang HUANG(Institute of Materia Medica. Chinese Academy of Medical Sciences & Peking Union Medical College.Xian Nong Tan Street. Beijing 100050) | 1999 | Chinese Chemical Letters1999，10，6： | 4 |
| 17 | 基于概率图模型的人脸多特征跟踪显示文摘同时跟踪具有丰富表情的人脸多个特征是一个有挑战性的问题 提出了一个基于时空概率图模型的方法 在时间域上 ,使用几个相互独立的Condensation类型的粒子滤波器分别跟踪人脸的每个特征 粒子滤波对独立的视觉跟踪问题非常有效 ,但是多个独立的跟踪器忽视了人脸的空间约束和人脸特征间的自然相互联系 ;在空间域上 ,事先从人脸表情库中学习人脸特征轮廓的相互关系 ,使用贝叶斯推理 -信任度传播算法来对人脸特征的轮廓位置进行求精 实验结果表明 ,文中算法可以在帧间运动较大的情况下 。 | 苏从勇 庄越挺 黄丽 吴飞 | 2004 | 计算机辅助设计与图形学学报2004，16，11： | 3 |
| 18 | One-step Condensation/copolymerization of VTES and DVB for Self-assembly Bionic Superhydrophobic Surface Coating and Study on Oil-water Separation显示文摘Mimicry of nature drives the development of bionic materials.Bionic superhydrophobic materials are a kind of high-efficiency materials to handle oil spills and water pollution.However,the stability of surface coatings of the superhydrophobic materials remains a challenge.Herein,a new category of self-assembly bionic superhydrophobic surface coating was prepared via one-step condensation/copolymerization of vinyltriethoxysilane(VTES)and divinylbenzene(DVB),which realized the close combination of covalent bonds between organic(e.g.DVB)and inorganic matter(e.g.VTES),and avoided the swelling of polydivinylbenzene(PDVB)in the process of collection of oil from water.This organic-inorganic hybrid polymer could self-assembly deposit on the surface of sponge even other substrates.For example,P(VTES-DVB)-Si0_(2)/MS obtained by assembling P(VTES-DVB)-Si0_(2)on the surface of Melamine Sponge(MS)exhibited superhydrophobicity with a Water Contact Angle(WCA)of 157.3,the optimal adsorption capacity of 77 g g 136 g g-1 for diverse oils,and an excellent separation efficiency of 99.3%.Besides,the excellent acid and alkali resistance of P(VTES-DVB)-Si0_(2)/MS suggested the potential value in practical oil-water separation.P(VTES-DVB)-Si0_(2)showed the outstanding hydrophobic performance by using as coating on different substrates.This work provided a new idea about the stable combination of organic and inorganic matter in the surface modification. | Ruilong Zhang Zhiping Zhou Yi Wang Xiaohui Dai Li Chen Jiangdong Dai | 2021 | Journal of Bionic Engineering2021，18，3： | 3 |
| 19 | SYNTHESIS OF BENZOINS BY DYE PHOTOSENSITIZATION显示文摘Using heavy-atom-containing xanthene dyes,benzoins can be quanti-tatively prepared by photosensitized reduction from benzils with triethyla-mine.It is an important supplement to'benzoin condensation',asp.for thosebenzoins with electron-donating substituents. | Zhan Gong ZHAO Tao SHEN institute of Photographic Chemistry,Academia Sinica,Beijing 100012,China | 1990 | Chinese Chemical Letters1990，1，1： | 3 |
| 20 | Novel cyclen-based linear polymer as a high-affinity binding material for DNA condensation显示文摘A novel cyclen-based linear polyamine (POGEC) was designed and synthesized from the reaction between 1,3-propanediol diglycidyl ether and 1,7-bis(diethoxyphosphory)-1,4,7,10-tetraazacyclod-odecane. High-affinity binding between POGEC and DNA was demonstrated by agarose gel electrophoresis and scanning electron microscopy (SEM). Moreover,the formed POGEC/DNA complex (termed polyplex) could be disassociated to release the free DNA through addition of the physiological concentration of NaCl solution. Fluorescence spectrum was used to measure the high-affinity binding and DNA condensation capability of POGEC. Circular dichroism (CD) spectrum indicates that the DNA conformation did not change after binding to POEGC. | XIANG YongZhe WANG Na ZHANG Ji LI Kun ZHANG ZhongWei LIN HongHui YU XiaoQi | 2009 | Science China Chemistry2009，52，4： | 3 |
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