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Enzyme catalysis at single-molecule level

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Science China Chemistry 2023年第9期66卷 2441-2442页

作者： Surong Zhang Dong Xiang Institute of Modern Optics and Center of Single-Molecule Science Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Nankai University Tianjin 300350 China School of Materials Science and Engineering Smart Sensing Interdisciplinary Science Center Nankai UniversityTianjin 300350 China tonglu feiran garment-nankai university joint laboratory Nankai University Tianjin 300350 China

Enzyme activity lays the foundation for the biochemical processes since the origin of life [1,2], and understanding the mechanism and kinetics of enzyme reactions is very important for the study of life science and bioengineering. The ensemble-averaged experiments are unable to characterize the transient intermediates or various specific steps during the catalytic cycle of enzymes, which brings a challenge to reveal enzyme-catalytic mechanisms. Now, in the article published in the Nature Catalysis, Prof. Wenjing Hong, *** Fang and Prof. Binju Wang in Xiamen university employed a scanning tunneling microscope-break junction technique (STM-BJ) with a time resolution of milli-second to probe the stepwise reaction dynamics of the catalytic cycle at the single-enzyme leve.

关键词： catalysis Xiamen kinetics

A high-performance molecular switch fabricated by the two-dimensional van der Waals heterojunction

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National Science Review 2023年第7期10卷 73-74页

作者： Xubin Zhang Adila Adijiang Dong Xiang Institute of Modern Optics and Center of Single-Molecule Science Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Nankai University Tong Lu Fei Ran garment-nankai university joint laboratory Nankai University School of Materials Science and Engineering Smart Sensing Interdisciplinary Science Center Nankai University

Since the concept that single molecules can be used as electronic components to construct active electronic devices was proposed,the preparation of commercially available single-molecule switches has become a research *** break through the dilemma of electronic components facing the failure of Moore's Law and further reduce the size of a chip,developing single-molecule electronics is particularly important and has yielded a wealth of *** research groups have successfully used optical fields[1,2],electric fields [3-5],and electrochemical methods [6] to modulate single-molecule behaviors and achieve single-molecule switching properties.

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Nb_(2)O_(5)promoted Pd/AC catalyst for selective phenol hydrogenation to cyclohexanone

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Chinese Journal of Chemical Engineering 2022年第4期35卷 87-93页

作者： Chunhua Zhang Zhengyan Qu Hong Jiang Rizhi Chen Weihong Xing State Key laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China Changzhou Key laboratory of Eco-Textile Technology Changzhou Vocational Institute of Textile and GarmentChangzhou 213164China

Phenol hydrogenation is a green route to prepare cyclohexanone,an intermediate for the production of nylon 66 and nylon *** development of high-performance catalysts still keeps a great ***,the activated carbon(AC)was modified with an acidic material Nb_(2)O_(5)to adjust the microstructure and surface properties of AC,and the influences of the calcination temperature and Nb_(2)O_(5)content on the catalytic performance of the Pd/AC-Nb_(2)O_(5)catalysts for the phenol hydrogenation to cyclohexanone were *** Nb_(2)O_(5)with proper content can be highly uniformly distributed on the AC surface,enhancing the acidity of the Pd/AC-Nb_(2)O_(5)catalysts with comparable specific surface area and Pd dispersion,thereby improving the catalytic *** hybrid Pd/AC-10 Nb_(2)O_(5)-500 catalyst exhibits the synergistic effect between the Pd nanoparticles and AC-10 Nb_(2)O_(5),which enhances the catalytic activity for the hydrogenation of ***,the as-prepared Pd/AC-10 Nb_(2)O_(5)-500 catalyst shows good reusability during 7 reaction cycles.

关键词： Phenol hydrogenation Cyclohexanone Nb_(2)O_(5) Pd/AC Acidity

Phenol hydrogenation to cyclohexanone over palladium nanoparticles loaded on charming activated carbon adjusted by facile heat treatment

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2600-2606页

作者： Chunhua Zhang Guangxin Yang Hong Jiang Yefei Liu Rizhi Chen Weihong Xing State Key laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China Changzhou Key laboratory of Eco-Textile Technology Changzhou Vocational Institute of Textile and GarmentChangzhou 213164China

Selective phenol hydrogenation is a green approach to produce *** still remains a big challenge to prepare efficient supports of the catalysts for the phenol hydrogenation via a simple and cost-effective ***,a facile approach was developed,i.e.,direct calcination of activated carbon(AC)under argon at high temperature,to improve its structure and surface *** modified AC materials were supported with Pd nanoparticles(NPs)to fabricate the Pd/C *** as-prepared Pd/C600 catalyst exhibits superior catalytic performance in the phenol hydrogenation,and its turnover frequency(TOF)value is 199.2 h^-1,1.31 times to that of Pd/*** Pd/C600 catalyst presents both better hydrophobicity and more structural defects,contributing to the improved dispersibility in the reaction solution(phenol-cyclohexane),the better Pd dispersion and the smaller Pd size,which result in the enhancement of the catalytic ***,the as-prepared Pd/C600 catalyst shows a good recyclability.

关键词： Cyclohexanone Phenol Hydrogenation Activated carbon Catalyst

Kinematic Analysis of Elliptic-Gear & Eccentric Slider-Crank & Uniform-Pitch Screw Weft-Insertion Mechanism

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Journal of Donghua university(English Edition) 2010年第6期27卷 852-857页

作者：陈建能赵雄蒋淼金绥强胡连军 College of Mechanical Engineering and Automation Zhejiang Sci-Tech University Zhejiang Province New Textile Research & Development Emphasised laboratory Zhejiang Textile & Garment Science & Technology Co.Ltd.

In order to analyze the kinematic performances of elliptic-gear & eccentric slider-crank & uniform-pitch screw weft-insertion mechanism proposed by us,kinematic mathematic models of the mechanism were established,and an aided analytic software was *** of some important parameters on the kinematic characteristics of the mechanism were analyzed.A group of preferable parameters were obtained according to the software and some *** of kinematic performances were made between the proposed mechanism and the variable-pitch screw insertion mechanism of C401 rapier loom manufactured by Vamatex Corp in *** results show that the proposed mechanism can meet the requirements of inserting wefts.

关键词： weft-insertion mechanism kinematic elliptic-gear eccentric slider-crank uniform-pitch screw

HRAM-VITON: High-Resolution Virtual Try-On with Attention Mechanism

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Computers, Materials & Continua 2025年第2期82卷 2753-2768页

作者： Yue Chen Xiaoman Liang Mugang Lin Fachao Zhang Huihuang Zhao College of Computer Science and Technology Hengyang Normal UniversityHengyang421002China Hunan Provincial Key laboratory of Intelligent Information Processing and Application Hengyang421002China

The objective of image-based virtual try-on is to seamlessly integrate clothing onto a target image, generating a realistic representation of the character in the specified attire. However, existing virtual try-on methods frequently encounter challenges, including misalignment between the body and clothing, noticeable artifacts, and the loss of intricate garment details. To overcome these challenges, we introduce a two-stage high-resolution virtual try-on framework that integrates an attention mechanism, comprising a garment warping stage and an image generation stage. During the garment warping stage, we incorporate a channel attention mechanism to effectively retain the critical features of the garment, addressing challenges such as the loss of patterns, colors, and other essential details commonly observed in virtual try-on images produced by existing methods. During the image generation stage, with the aim of maximizing the utilization of the information proffered by the input image, the input features undergo double sampling within the normalization procedure, thereby enhancing the detail fidelity and clothing alignment efficacy of the output image. Experimental evaluations conducted on high-resolution datasets validate the effectiveness of the proposed method. Results demonstrate significant improvements in preserving garment details, reducing artifacts, and achieving superior alignment between the clothing and body compared to baseline methods, establishing its advantage in generating realistic and high-quality virtual try-on images.

关键词： Virtual try-on attention mechanism high-resolution image generation

Effect of radio frequency bias on plasma characteristics of inductively coupled argon discharge based on fluid simulations

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Chinese Physics B 2020年第9期29卷 369-376页

作者： Xiao-Yan Sun Yu-Ru Zhang Sen Chai You-Nian Wang Yan-Yan Chu Jian-Xin He Textile and garment Industry of Research Institute Zhongyuan University of TechnologyZhengzhou 450007China Key laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China China Special Equipment Inspection and Research Institute Beijing 100029China

t A fluid model is employed to investigate the effect of radio frequency bias on the behavior of an argon inductively coupled plasma(ICP).In particular,the effects of ICP source power,single-frequency bias power,and dual-frequency bias power on the characteristics of ICP are simulated at a fixed pressure of 30 mTorr(1 Torr=1.33322×102 Pa).When the bias frequency is fixed at 27.12 MHz,the two-dimensional(2D)plasma density profile is significantly affected by the bias power at low ICP source power(e.g.,50 W),whereas it is weakly affected by the bias power at higher ICP source power(e.g.,100 W).When dual-frequency(27.12 MHz/2.26 MHz)bias is applied and the sum of bias powers is fixed at 500 W,a pronounced increase in the maximum argon ion density is observed with the increase of the bias power ratio in the absence of ICP source *** the ratio of 27.12-MHz/2.26-MHz bias power decreases from 500 W/0 W to 0 W/500 W with the ICP source power fixed at 50 W,the plasma density profiles smoothly shifts from edge-high to center-high,and the effect of bias power on the plasma distribution becomes weaker with the bias power ratio ***,the axial ion flux at the substrate surface is characterized by a maximum at the edge of the *** the ICP source power is higher,the 2D plasma density profiles,as well as the spatiotemporal and radial distributions of ion flux at the substrate surface are characterized by a peak in the reactor center,and the distributions of plasma parameters are negligibly affected by the dual-frequency bias power ratio.

关键词： fluid simulation single-and dual-frequency bias power plasma distribution

Properties and Structure of Multi-walled Carbon Nanotubes/Cellulose Composites Fibers Using Ionic Liquid as Solvent

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Journal of Donghua university(English Edition) 2011年第6期28卷 591-594页

作者：蔡涛杨瑜榕王明葵张慧慧 National Textile and garment Quality Supervision Testing Center Fiber Inspection Bureau of Fujian Province State Key laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University

To take advantage of cellulose material and prepare a kind of high performance fiber,multi-walled carbon nanotubes(MWNTs) were used as fillers to produce MWNTs/cellulose composite fibers using ionic liquid as *** thermal properties,mechanical properties,and structure of the composite fibers were *** wide angle X-ray diffraction(WAXD) measurements show that MWNTs/cellulose composite fibers have cellulose Ⅱ crystal *** results obtained from thermal gravimetric analysis(TGA) indicate that the addition of low nanotubes amounts leads to an increase in the degrade *** tensile mechanical properties show that initial modulus and tensile strength considerably increase in the presence of nanotubes with a maximum for 66.7% and 22.7%.

关键词： carbon nanotubes ionic liquid composite fiber mechanical properties

Influence of Clothing Fabrics on Skin Microcirculation

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Journal of Donghua university(English Edition) 2010年第3期27卷 300-305页

作者：成玲潘宁赵连英黄故 Key laboratory of Advanced Textile Composites Ministry of EducationTianjin Polytechnic University Department of Textiles and Clothing College of Agricultural and Environmental SciencesUniversity of CaliforniaDavisCA Key laboratory of New Textile Research & Development Zhejiang Textile & Garment Science & Technology Co.Ltd.

This study investigated the effects of clothing fabric on human skin *** skin is covered with a clothing fabric,human sensations,namely,coolness,warmth,softness,and roughness,are aroused immediately,and the cutaneous microcirculation may be changed *** the complex relationships of the human skin,the environment,and the clothing,there is few publication focusing on the physiological responses of the skin to the *** this paper,a Laser Doppler Flowmetry(LDF)was used to test the dynamic responses of the skin blood flow when the fabric was placed on the *** of different fabrics on the skin blood flux were *** results show that cold stimulation of fabric has remarkable influences on the skin blood flux,and the surface properties of fabric are of importance to affect the human skin blood flow.

关键词： skin blood flow Laser Doppler stimulation fabric surface characteristic