检索结果-南通市图书馆

Biological composite fibers with extraordinary mechanical strength and toughness mediated by multiple intermolecular interacting networks

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第10期15卷 9192-9198页

作者： Sikang wan Wenhao Cheng jingjing Li Fan wang Xiwen Xing jing Sun Hongjie Zhang Kai Liu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Department of Biotechnology College of Life Science and TechnologyJinan UniversityGuangzhou 510632China Institute of Organic Chemistry Ulm UniversityAlbert-Einstein-Allee 1189081 UlmGermany Department of Chemistry Tsinghua UniversityBeijing 100084China

Numerous strategies involving multiple cross-linking networks have been applied for fabricating robust *** by this,the development of mechanically strong and tough biological fibers by the incorporation of intermolecular linking networks is becoming ***,we present a versatile strategy for the fabrication of protein-saccharide composite fibers through protein-initiated double interacting *** types of lysine-rich bioengineered proteins were introduced and the present multiple cross-linking interactions including electrostatic forces and covalent bonds significantly enhanced the mechanical properties of as-obtained composite *** stark contrast to pristine saccharide or other polymer fibers,the as-obtained composite fibers exhibited outstanding mechanical performance,showing a breaking strength of~768 MPa,Young’s modulus of~24 GPa,and toughness of~69 MJ∙m^(–3),***,this established approach has great potentials to fabricate new generation renewable biological fibers with high performance.

关键词： biomaterial composite fiber protein intermolecular networks mechanical performance

Principle of Multi-roller Straightening Process and Quantitative Resolutions of Straightening Strategies

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2014年第9期21卷 823-829页

作者： jing YIN Jun ZHAO Shi-yan wang Xian-song wan Yue-lin LI College of Mechanical Engineering Ningbo University of Technology Key Laboratory of Advanced Forging and Stamping Technology and Science(Yanshan University) Ministry of Education of China CISDI R&D Co. Ltd.

The multi-roller straightening process of section steel is analyzed by the springback theory of small curva- ture plane bending. The theoretical analysis results prove the curvature unification in straightening process and clear- ly reveal the principle of the multi-roller straightening process. The principle can be described as~ the initial curva- tures are reduced by several times anti-bendingl meanwhile the initial curvature differences are diminished and the residual curvatures are unified~ finally, the member after curvature unification is straightened by the last anti-ben- ding. With the plastic region ratios becoming larger, the initial curvatures are more easily unified in straightening process. Based on the plastic region ratios and the required number of roller systems for unifying the initial curva- tures, the large deformation straightening strategy and the small deformation straightening strategy are redefined. The new definition provides an important theoretical basis for setting reliable reduction rules. Through the theoretical analysis results, a new straightener design philosophy is proposed to improve the straightening quality and further increase the adjustment precision as well as the flexibility of the last roller system. The adjustable end roller emerges as the times required, achieving a good effect in practical application.

关键词： section steel multi-roller straightening curvature unification plastic region ratio straightening strategy

Exploring the Far Side of Glycosyl Sulfoxide Activation Process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第4期41卷 383-391页

作者： Wei Chen Pinru Wu jing Zeng jing Fang Zhiwen Liao Lei Cai Hao wang Lingkui Meng Qian wan Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of PharmacyHuazhong University of Science and Technology13 Hangkong RoadWuhanHubei430030 China Wuhan Union Hospital of China Huazhong University of Science and Technology1277 Jiefang AvenueWuhanHubei430022 China

The discovery of Kahne glycosylation forwards a big step in the carbohydrate *** an extensive series of studies,the precise mechanism of this powerful glycosylation is still not fully *** address these 30-year puzzles,the far side of Kahne glycosylation is explored in this *** a series of control and tracking experiments,a number of important intermediates including glycosyl oxo-sulfonium ion and sulfenic anhydride(Crich's intermediate)are suggested to be responsible for the complex reaction *** also reveals that in addition to the conventional ionic glycosylation pathway,a novel free radical pathway is very likely to contribute to the various side-and *** study provides further understanding of Kahne glycosylation,and it also sheds light on how to improve the efficiency of sulfoxide-based glycosylation reactions.

关键词： Carbohydrates Kahne glycosylation Radicals Reaction mechanisms Reactive intermediates

STING-activating drug delivery systems:Design strategies and biomedical applications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第5期32卷 1615-1625页

作者： Chunying Li Yifan Zhang Yilin wan jingle wang jing Lin Zhiming Li Peng Huang Department of Dermatology and Venereology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000China Marshall Laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Health Science CenterShenzhen 518060China Department of Medical Oncology The Third Affiliated Hospital of Shanghai UniversityWenzhou 325000China

The stimulator of interferon genes(STING)shows promising clinical activity in infectious diseases and ***,the lack of targeting capability and intracellular stability of STING agonists severely limits the therapeutic ***,drug delivery systems(DDSs)overcome these delivery barriers of STING agonists via passive or active cell targeting,prolonged blood circulation and drug release,and lysosome escape,*** this review,we will describe in detail how existing DDSs are designed to overcome delivery barriers and activate the STING pathway,and the current biomedical applications of STING-activating DDSs in the treatments of infectious diseases and ***,the prospects and challenges of DDSs in STING activation are discussed.

关键词： STING agonist Drug delivery system Cancer treatment Anti-virus treatment Immunotherapy

Low Li ion diffusion barrier on low-crystalline FeOOH nanosheets and high performance of energy storage

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第3期13卷 759-767页

作者： Jien Li Shuang Luo Congcong wang Qian Tang Yanwei wang Xiangyu Han Hao Ran jing wan Xiao Gu Xue wang Chenguo Hu Department of Applied Physics State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing400044China Faculty of Science Ningbo UniversityNingbo315211China

To obtain symmetric supercapacitors(SCs)with high energy density,it is critical to fabricate an electrode with wide potential window and excellent capacitive ***,by using the strong double hydrolysis reaction between anions and cations,the FeOOH nanosheets on the surface of activated carbon cloth(FeOOH@AC)are prepared through a simple hydrothermal *** FeOOH@AC electrode exhibits maximum capacitance of 4,090 mF·cm^−2 at wider potential window-1–0 V and 3,250 mF·cm^−2 at 0–1 V versus SCE in 2 M LiNO3 *** two pieces of FeOOH@AC electrodes the obtained symmetric SC can operate at the voltage window of 2 *** FeOOH symmetric SC shows high energy density of 13.261 mWh·cm^−3 at a power density of 14.824 mW·cm^−3 and maintains 4.175 mWh·cm^−3 at a maximum power density of 118.564 mW·cm^−3,as well as excellent charge storage capacity and cyclic *** ion adsorption and diffusion mechanism on the(200)facets of FeOOH are explained by the density functional theory(DFT)*** simple synthesis process and excellent capacitance performance of the FeOOH@AC composite make it a very promising candidate for high performance symmetric SC electrodes.

关键词： low-crystalline nanosheets FeOOH density functional theory supercapacitor

Effect of Degree-of-Symmetry on Kinetostatic Characteristics of Flexure Mechanisms:A Comparative Case Study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2018年第2期31卷 54-65页

作者： Xiao-Bing He jing-Jun Yu wan-wan Zhang Guang-Bo Hao School of Mechanical Engineering and Automation Beihang University School of Engineering-Electrical and Electronic Engineering University College Cork

The current research of kinetostatic characteristics in flexure mechanisms mainly focus on the improvement of accuracy. To reduce or eliminate the parasitic motion is considered as an approach by using the common knowledge of symmetry. However, there is no study on designing the flexure mechanisms with symmetrical features as many as possible for better kinetostatic performance, when considering the resulting cost by the symmetry. In this paper, the concept of degree of symmetry(DoS) is proposed for the first time, which is committed to symmetry design in the phase of conceptual design. A class of flexure mechanisms with 0?DoS, 1?DoS, 2?DoS and 3?DoS are synthesized respectively based on the Freedom and Constraint Topology method. Their overall compliance matrices in an analytical form formulated within the framework of the screw theory are used to analyze and compare the effect of different number of DoS on the kinetostatic characteristics for flexure mechanisms. The finite element analysis(FEA) simulations are implemented to verify the analytical results. These results show that the higher the DoS is, the smaller the parasitic motion error will be. The flexure model with 3?DoS is optimized according to the overall compliance matrix and then tested by using the FEA simulation. The testing result shows that with the best combination parameters, the parasitic motion error for 3?DoS mechanism is almost eliminated. This research introduces a design principle which can alleviate the unwanted parasitic motion for better accuracy.

关键词： Flexure mechanism Symmetry Kinetostatic characteristics FEA simulation

Real-time camera tracking using hybrid features in mobile augmented reality

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第11期58卷 211-223页

作者： wang WeiJie wan HuaGen State Key Laboratory of CAD&CG Zhejiang University

Often only simple features are employed in mobile augmented reality(AR) due to the limited computational capacity of mobile terminals, which often leads to unsteadiness of the camera tracking. In this paper, we propose a novel approach to real-time camera tracking in mobile AR using hybrid features to alleviate this problem. By integrating feature points and lines as scene features, hybrid features are generated through the process of point/line features extraction, optimization and fusion, and are used in the real-time estimation of camera parameters. A method for image feature optimization is proposed based on the scene structural analysis to meet the computational constraints of mobile terminals. In order to improve the stability of camera tracking, an iterative screening method is proposed to choose a set of stable feature lines, and hybrid features are adaptively constructed based on the composition and geometry of scene features. It is shown from the experimental results that the proposed method produces more stable and smoother camera trajectories in comparison with the method only using feature points, and a good balance is achieved between the stability and the real-time computation of the camera tracking on a mobile platform.

关键词： mobile augmented reality feature extraction camera tracking hybrid feature mobile platform

The Bott-Chern and Aeppli Cohomologies of Complex Structures on S^(3)×S^(3)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第4期37卷 581-587页

作者： jing jing wang School of Mathematical Sciences Fudan UniversityShanghai 200433P.R.China

We calculate the dimensions of Bott–Chern and Aeppli cohomologies associated to a complex structure on S^(3)×S^(3).We express them in terms mainly of Hogde numbers.

关键词： Complex structure S^(3)×S^(3) Bott–Chern cohomology Aeppli cohomology

When Electronically Inert Polymers Meet Conjugated Polymers:Emerging Opportunities in Organic Photovoltaics

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第8期40卷 861-869,I0006页

作者： jing-jing wang Long Ye School of Materials Science&Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin300350China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China

Insulating polymers(commodity plastics in particular)are a major category of polymeric materials widely used in our daily life,but they exhibit abysmal electrical ***,conjugated polymers are gaining tremendous interest due to their excellent electrical properties and versatile applications in organic *** this perspective,we provide a concise account of the added value in organic solar cells,as brought by the combined use of conjugated and insulating *** challenging tasks and prospective directions are given to the potential benefits of employing insulating polymer additives,which spans from common commodity plastics to high-temperature resistant resins and thermoplastic ***,the inert polymers can improve many important properties such as mechanical and thermal robustness but not sacrifice optoelectronic performance.

关键词： Organic solar cells Insulating polymers Photovoltaic polymers Miscibility Morphology