检索结果-南通市图书馆

Near-perfect replication on amorphous alloys through active force modulation based on machine learning/neural network parameter prediction

引用

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 181-191页

作者： Senkuan Meng zheng wang Ruisong Zhu Ruijie Liu Jiang Ma Lina Hu Weihua wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shandong University College of Mechatronics and Control Engineering Shenzhen University Songshan Lake Materials Laboratory Institute of Physics Chinese Academy of Sciences

As a microforming technique, micro/nano-structural replication possesses advantages of high precision and efficiency. With the remarkable superplasticity in the supercooled liquid region, amorphous alloys or metallic glasses(MGs) are regarded as ideal materials for miniature fabrication. However, due to the intrinsic metastable nature of supercooled liquids, the design of imprinting processes for MGs poses a challenge. In the past, process parameters have largely relied on trial-and-error *** this work, a low-frequency active force modulation system is employed to apply a stable, precise, and real-time feedback stress field for imprinting of MG samples. Low-frequency vibrations can facilitate the filling of microstructures on the template surface by reducing the effective viscosity of the supercooled liquid. With the dataset composed of orthogonal experiments, a machine learning strategy based on back-propagation(BP) neural networks was utilized to construct a 3D parameter space for temperature, stress, and time, and to predict the corresponding filling ratio. Furthermore, the optimal combination of imprinting process parameters was identified, and its filling ratio was experimentally validated to reach as high as 0.94. The near-perfect replication of microstructures confirms the superiority of the active force modulation system and the data-driven strategy of machine learning-assisted parameter design. At the same time, this one-step microforming process provides a new approach to addressing the accuracy-cost trade-off dilemma in precision manufacturing.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Flow units as dynamic defects in metallic glassy materials

引用

National Science Review 2019年第2期6卷 304-323页

作者： zheng wang Wei-Hua wang Institute of Physics Chinese Academy of Sciences

In a crystalline material, structural defects such as dislocations or twins are well defined and largely determine the mechanical and other properties of the material. For metallic glass(MG) with unique properties in the absence of a long-range lattice, intensive efforts have focused on the search for similar 'defects'. The primary objective has been the elucidation of the flow mechanism of MGs. However,their atomistic mechanism of mechanical deformation and atomic flow response to stress, temperature, and failure, have proven to be challenging. In this paper, we briefly review the state-of-the-art studies on the dynamic defects in metallic glasses from the perspective of flow units. The characteristics, activation and evolution processes of flow units as well as their correlation with mechanical properties, including plasticity,strength, fracture, and dynamic relaxation, are introduced. We show that flow units that are similar to structural defects such as dislocations are crucial in the optimization and design of metallic glassy materials via the thermal, mechanical and high-pressure tailoring of these units. In this report, the relevant issues and open questions with regard to the flow unit model are also introduced and discussed.

关键词： metallic glass flow unit flow glass transition mechanical deformation property optimization

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Anti-biofouling strategies for implantable biosensors of continuous glucose monitoring systems

引用

Frontiers of Chemical Science and Engineering 2023年第12期17卷 1866-1878页

作者： Yan zheng Dunyun Shi zheng wang School of Pharmaceutical Science&Technology Tianjin UniversityTianjin 300072China Institute of Hematology Shenzhen Second People’s Hospital/the First Affiliated Hospital of Shenzhen UniversityShenzhen 518035China

Continuous glucose monitoring(CGM)systems play an increasingly vital role in the glycemic control of patients with diabetes ***,the immune responses triggered by the implantation of poorly biocompatible sensors have a significant impact on the accuracy and lifetime of CGM *** this review,research efforts over the past few years to mitigate the immune responses by enhancing the anti-biofouling ability of sensors are *** review divided these works into active immune engaging strategy and passive immune escape strategy based on their respective *** each strategy,the various biocompatible layers on the biosensor surface,such as drug-releasing membranes,hydrogels,hydrophilic membranes,anti-biofouling membranes based on zwitterionic polymers,and bio-mimicking membranes,are described in *** review,therefore,provides researchers working on implantable biosensors for CGM systems with vital information,which is likely to aid in the research and development of novel CGM systems with profound anti-biofouling properties.

关键词： implantable glucose biosensor anti-biofouling continuous glucose monitoring immune responses

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of an Azobenzene-containing Main-chain Crystalline Polymer and Photodeformation Behaviors of Its Supramolecular Hydrogen-bonded Fibers

引用

Chinese Journal of Polymer Science 2020年第1期38卷 37-44,I0006页

作者： zheng-zheng wang Hui-Qi Zhang State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer Materials (Ministry of Education) Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) and College of Chemistry Nankai University

The synthesis of a new azobenzene(azo)-containing main-chain crystalline polymer with reactive secondary amino groups in its backbone and photodeformation behaviors of its supramolecular hydrogen-bonded fibers are described. This main-chain azo polymer(namely Azo-MP6) was prepared via first the synthesis of a diacrylate-type azo monomer and its subsequent Michael addition copolymerization with trans-1,4-cyclohexanediamine under a mild reaction condition. Azo-MP6 was found to have a linear main-chain chemical structure instead of a branched one, as verified by comparing its ~1H-NMR spectrum with that of the azo polymer prepared via the polymer analogous reaction of AzoMP6 with acetic anhydride. The thermal stability, phase transition behavior, and photoresponsivity of Azo-MP6 were characterized with TGA,DSC, POM, XRD, and UV-Vis spectroscopy. The experimental results revealed that it had good thermal stability, low glass transition temperature,broad crystalline phase temperature range, and highly reversible photoresponsivity. Physically crosslinked supramolecular hydrogen-bonded fibers with good mechanical properties and a high alignment order of azo mesogens were readily fabricated from Azo-MP6 by using the simple melt spinning method, and they could show "reversible" photoinduced bending under the same UV light irradiation and good anti-fatigue properties.

关键词： Main-chain azobenzene polymer Crystalline polymer Michael addition polymerization Physically crosslinked network Photodeformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

IN VIVO MAPPING BRAIN MICROCIRCULATION BY LASER SPECKLE CONTRAST IMAGING:A MAGNETIC RESONANCE PERSPECTIVE OF THEORETICAL FRAMEWORK

引用

Journal of Innovative Optical Health Sciences 2008年第2期1卷 239-256页

作者： zheng wang Center for Functional and Metabolic Mapping Robarts Research Institute Department of Medical Biophysics The University of Western Ontario LondonCanada

The fundamental limitations of most vascular-based functional neuroimaging techniques are placed by the fact how fine the brain regulates the blood supply *** vivo mapping of the cerebral microcirculation with high resolution and sensitivity hence becomes unprecedentedly *** paper reviews the theoretical background of the laser speckle contrast imaging(LSCI)technique and attempts to present a complete framework stemming from a simple biophysical *** the sensitivity analysis,more insights into the tool optimization are attained for in vivo *** questions of the technical aspects are discussed within this unified ***,it concludes with a brief perspective of future research in a way analogous to the magnetic resonance imaging(MRI)*** exploration could catalyze their development and initiate a technological fusion for precise assessment of blood flow across various spatial scales.

关键词： Laser speckle contrast imaging brain microcirculation functional neuroimaging magnetic resonance imaging

来源：

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

Effect of Honeycomb Seals on Loss Characteristics in Shroud Cavities of an Axial Turbine

引用

Chinese Journal of Mechanical Engineering 2013年第1期26卷 69-77页

作者： GAO Jie zheng Qun wang zheng College of Power and Energy Engineering Harbin Engineering University

The loss in efficiency due to shroud leakage or tip clearance flow accounts for a substantial part of the overall losses in turbomachinery. It is important to identify the leakage loss characteristics in order to optimize turbomachinery. At present, little information is available in the open literature concerning the effect of honeycomb seals on the loss characteristics in shroud cavities of an axial turbine, despite of the widespread use of the honeycomb seals. Therefore, interaction between rotor labyrinth seal leakage flow with and without honeycomb facings and main flow is investigated to provide the loss characteristics of the mixing process of the re-entering leakage flow into the main flow. The effects of honeycomb seals on the flow in shroud cavities and interaction with the main flow are analyzed. An additional study on the impact of subtle shroud cavity exit geometry is also presented. The investigation results indicate that the honeycomb seal affects the over tip leakage flow and reduces mixing losses when compared to the solid labyrinth seal. The leakage flow interactions with the main flow have considerably changed the flow fields in the endwall regions. The proposed research reveals the effects of honeycomb seals on the loss characteristics in shroud cavities and the impact of subtle shroud cavity exit geometry, and it is helpful for the design optimization of turbomachinery.

关键词： tip leakage flow honeycomb seal mixing losses exit cavity geometry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

p-adic Modular Symbols and ∧-adic Modular Forms

引用

Acta Mathematica Sinica,English Series 2006年第2期22卷 331-338页

作者： Fu zheng wang LMAM&Department of Mathematics.Peking University

A construction of A-adic modular forms from p-adic modular symbols is described. It shows that each A linear map satisfying some certain conditions from the module of p-adic modular symbols to A corresponds to a A-adi... 详细信息

关键词： Modular symbol Manin symbol A-adic modular form

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hexachlorobutadiene emissions from typical chemical plants

引用

Frontiers of Environmental Science & Engineering 2021年第4期15卷 77-83页

作者： Minxiang wang Lili Yang Xiaoyun Liu zheng wang Guorui Liu Minghui zheng College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou310000China

Hexachlorobutadiene(HCBD)was classed as a persistent organic pollutant under the Stockholm Convention in *** is mainly an unintentionally produced by-product of chlorinated hydrocarbon(e.g.,trichloroethylene and tetrachloroethylene)*** studies of HCBD formation during chemical production processes have been performed,so HCBD emissions from these potentially important sources are not *** this study,HCBD concentrations in raw materials,intermediate products,products,and bottom residues from chemical plants producing chlorobenzene,trichloroethylene,and tetrachloroethylene were *** results indicated that HCBD is unintentionally produced at much higher concentrations in trichloroethylene and tetrachloroethylene plants than chlorobenzene *** sum of the HCBD concentrations in the samples from all of the trichloroethylene and tetrachloroethylene production stages in plant PC was 247000µg/mL,about three orders of magnitude higher than the concentrations in the tetrachloroethylene production samples(plant PB)and about six orders of magnitude higher than the concentrations in the chlorobenzene production samples(plant PA).The HCBD concentrations were highest in bottom residues from all of the *** concentrations in the bottom residue samples contributed 24%–99%of the total HCBD formed in the chemical production *** bottom residue,being hazardous waste,could be disposed of by *** HCBD concentrations were much higher in intermediate products than raw materials,indicating that HCBD formed during production of the intended *** results indicate the concentrations of HCBD unintentionally produced in typical chemical plants and will be useful in developing protocols for controlling HCBD emissions to meet the Stockholm Convention requirements.

关键词： Hexachlorobutadiene Chemical plant Chlorobenzene Trichloroethylene Tetrachloroethylene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Time-dependent Vibration Frequency Reliability Analysis of Blade Vibration of Compressor Wheel of Turbocharger for Vehicle Application

引用

Chinese Journal of Mechanical Engineering 2014年第1期27卷 205-210页

作者： wang zheng wang Zengquan ZHUANG Li wang A-na Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

Blade vibration failure is one of the main failure modes of compressor wheel of turbocharger for vehicle application. The existing models for evaluating the reliability of blade vibration of compressor wheel are static, and can not reflect the relationship between the reliability of compressor wheel with blade vibration failure mode and the life parameter. For the blade vibration failure mode of compressor wheel of turbocharger, the reliability evaluation method is studied. Taking a compressor wheel of turbocharger for vehicle application as an example, the blade vibration characteristics and how they change with the operating parameters of turbocharger are analyzed. The failure criterion for blade vibration mode of compressor wheel is built with the Campbell diagram, and taking the effect of the dispersity of blade natural vibration frequency and randomness of turbocharger operating speed into account, time-dependent reliability models of compressor wheel with blade vibration failure mode are derived, which embody the parameters of blade natural vibration frequency, turbocharger operating speed, the blade number of compressor wheel, life index and minimum number of resonance, etc. Finally, the rule governing the reliability and failure rate of compressor wheel and the method for determining the reliable life of compressor with blade vibration is presented. A method is proposed to evaluate the reliability of compressor wheel with blade vibration failure mode time-dependently.

关键词： turbocharger compressor wheel blade vibration reliability failure rate reliable life

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Systematic evaluation of advance in application and discharge mechanism of solution electrode glow discharge

引用

Chinese Chemical Letters 2022年第1期33卷 61-70页

作者： Xiaoxu Peng zheng wang Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

As a kind of microplasma sustained in air,solution electrode glow discharge(SEGD)ignited between the liquid electrode and metal electrode is attractive to the fields of optical emission spectrometry and mass spectrometry due to its unique advantages,such as low power consumption and low carrier gas ***,the complex and efficient reactions in the liquid phase and plasma phase of SEGD make it considerable research potential in the fields of biology and medicine,material synthesis,*** the close relationship between the various fields on SEGD,here we are devoted to provide an overview of the development of SEGD in various *** importantly,a systematic discussion on the discharge mechanism is conducted based on the research process in various fields for getting deeper insight into the SEGD.

关键词： Solution cathode glow discharge Solution anode glow discharge Mass spectrometry Optimal emission spectroscopy Discharge mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：