检索结果-南通市图书馆

Penetration into a granular bed in the presence of upward gas flows

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

Particuology 2023年第11期82卷 1-12页

作者： hongsheng chen Li Xia chenrui Li Zengyong Zheng College of Materials Science and Engineering Chongqing UniversityChongqing400044China

We present a numerical study on the penetration of spherical projectiles into a granular bed in the presence of upward gas *** to the presence of interstitial fluid,the force chains between particles in the granular bed are weakened significantly,and this distinguishes the penetration behavior from that in the absence of *** interesting phenomenon,namely granular jet,is observed during the penetration,and the mechanism for its formation and growth is attributed to the merging of granular vortices generated by the interaction between the intruder and primary ***,both the final penetration depth and the maximum diameter of the crater are found to follow a power-law dependence with the impact velocity,and the maximum height reached by the granular jet tends to increase linearly as the impact velocity increases,agreeing well with the experimental results reported in the literature.

关键词： Penetration Granular bed Granular jet CFD-DEM

Microstructure evolution and corrosion resistance of AZ31 magnesium alloy tube by stagger spinning

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

International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1361-1372页

作者： Fanlin Zheng hongsheng chen Yuanqi Zhang Wenxian Wang Huihui Nie College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Advanced Magnesium-Based Materials Taiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

This study fabricates an AZ31 magnesium alloy tube by spinning technology-power stagger forward *** microstructure evolution of the tube is investigated by combining electron backscatter diffraction and transmission electron microscopy analysis,and the corrosion resistance is measured by an electrochemical corrosion *** show that the grains are obviously more uniform and finer along the wall thickness’s direction of the AZ31 alloy tube after the third spinning *** number of twins ascends first and then descends,while the varying trend of low-angle grain boundaries(LAGBs)is opposite to that of the twins as the spinning pass *** the increase of the total spinning deformation,the deformation texture initially increases and the c-axis of the{0001}crystal plane gradually rotates to the axial direction of the tube;the deformation texture then decreases and the orientation of grains becomes more *** main mechanism of grain refinement is dynamic recrystallization by the twin-induced way and bowing out of the nucleation at grain boundaries during the first and second ***,the dominant mechanism of the refined grain is the high-temperature dynamic recovery in the third pass,and the microstructure mainly consists of substructured *** the spinning deformation,the corrosion resistance of the AZ31 alloy tube decreases due to the combined effect of twins and high density-dislocations.

关键词： AZ31 magnesium alloy power stagger forward spinning microstructure evolution corrosion resistance

维普期刊数据库

Invisibility cloaks from forward design to inverse design

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第12期56卷 99-109页

作者： XU Su WANG Yong ZHANG BaiLe chen hongsheng State Key Laboratory of Modern Optical Instrumentation Zhejiang University The Electromagnetics Academy at Zhejiang University Zhejiang University Department of Information Science & Electronic Engineering Zhejiang University Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University Centre for Disruptive Photonic Technologies Nanyang Technological University

In this paper,we review the invisibility cloak design methodologies and their experimental developments from a practical perspective,as well as basic underlying theories,derived materials,and experimental *** stress is laid on the recent transition from forward design to inverse design where some signifcant limitations of previous cloaking solution in practice can be *** anticipate that future invisibility cloaking devices will be based on integration of both forward and inverse designs.

关键词： invisibility cloak transformation optics metamterials inverse design scattering

The effect of melt overheating on the melt structure transition and solidified structures of Sn-Bi40 alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第9期51卷 1402-1408页

作者： chen hongsheng ZU FangQiu chen Jie ZOU Li DING GuoHua HUANG ZhongYue Liquid/Solid Metal Processing Institute School of Materials Science and EngineeringHefei University of TechnologyHefei 230009China

Evolution of the electrical resistivity of Sn-40wt%Bi melt with time under different overheating temperatures during isothermal experiments has been studied, and the relationship between different melt state, solidification behavior and solidified structure has also been investigated. The results show that the melt structure transition revealed by the abnormal change of resistivity would take place within a certain holding time just when the holding temperature is above a certain critical, and that the higher the temperature above the critical, the shorter the "incubation period" of the melt structure transition, and the faster the transition speed. The results of solidification experiments suggest that the melt structure transition caused by different holding time at the same temperature can lead to a higher so-lidification undercooling degree, finer grain size and change of microscopic pattern. Further exploration indicates that the solidification undercooling degree can come to a head when the melt is held at the specific temperature for a given time. The functionary mechanism of the phenomena above is also discussed briefly.

关键词： Sn-Bi alloy electrical resistivity melt structure transition solidified structure

维普期刊数据库

A knowledge-inherited learning for intelligent metasurface design and assembly

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第4期12卷 680-690页

作者： Yuetian Jia Chao Qian Zhixiang Fan Tong Cai Er-Ping Li hongsheng chen ZJU-UIUC Institute Interdisciplinary Center for Quantum InformationState Key Laboratory of Extreme Photonics and InstrumentationZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang UniversityHangzhou 310027China Jinhua Institute of Zhejiang University Zhejiang UniversityJinhua 321099China Air and Missile Defense College Air Force Engineering UniversityXi'an 710051China Shaoxing Institute of Zhejiang University zhejiang UniversityShaoxing321000China

Recent breakthroughs in deep learning have ushered in an essential tool for optics and photonics,recurring in various applications of material design,system optimization,and automation *** learning-enabled on-demand metasurface design has been the subject of extensive expansion,as it can alleviate the time-consuming,low-efficiency,and experience-orientated shortcomings in conventional numerical simulations and physics-based ***,collecting samples and training neural networks are fundamentally confined to predefined individual metamaterials and tend to fail for large problem *** by object-oriented C++programming,we propose a knowledge-inherited paradigm for multi-object and shape-unbound metasurface inverse *** inherited neural network carries knowledge from the"parent"metasurface and then is freely assembled to construct the"offspring"metasurface;such a process is as simple as building a container-type *** benchmark the paradigm by the free design of aperiodic and periodic metasurfaces,with accuracies that reach 86.7%.Furthermore,we present an intelligent origami metasurface to facilitate compatible and lightweight satellite communication *** work opens up a new avenue for automatic metasurface design and leverages the assemblability to broaden the adaptability of intelligent metadevices.

关键词： breakthrough consuming shortcomings

Oxidation behavior of high-strength FeCrAl alloys in a high-temperature supercritical carbon dioxide environment

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

Progress in Natural Science:Materials International 2018年第6期28卷 731-739页

作者： hongsheng chen Sung Hwan Kim Chongsheng Long Chaewon Kim Changheui Jang Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China

The oxidation behavior of three high-strength FeCrAl alloys was investigated in supercritical carbon dioxide environment at 650 ℃. After exposure for 500 h, the weight gains of the FeCrAl alloys gradually decreased with increasing Al content. The oxide scales are primarily composed of α-Al;O;and spinel oxides. With increasing Al content, the amount of α-Al;O;increases and the C content decreased in the oxide scale and sub-scale ***, larger（Nb,Mo）C carbides formed in the sub-scale matrix and their number decreased with the increase of Al content.

关键词： High-strength FeCrAl alloy Supercritical carbon dioxide Oxidation α-Al2O3

不同浓度丁香酚对肌原纤维蛋白结构和乳液凝胶特性的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

食品工业科技 2025年第1期46卷 144-151页

作者：李嘉琦潘德胤马金明刁静静陈洪生黑龙江八一农垦大学食品学院黑龙江大庆163319 黑龙江八一农垦大学牡丹江食品与生物技术创新研究院黑龙江牡丹江157199 黑龙江省食品与生物技术创新研究中心(国际合作) 黑龙江大庆163319

为了探究丁香酚添加量对肌原纤维蛋白乳液凝胶特性的影响,本文以猪肌原纤维蛋白为研究对象,模拟乳化香肠的加工过程,通过测定不同浓度的丁香酚(0、5、10、20、50、100 mg/g蛋白质)添加对蛋白的二级结构、凝胶强度、保水率、水分分布、... 详细信息

为了探究丁香酚添加量对肌原纤维蛋白乳液凝胶特性的影响,本文以猪肌原纤维蛋白为研究对象,模拟乳化香肠的加工过程,通过测定不同浓度的丁香酚(0、5、10、20、50、100 mg/g蛋白质)添加对蛋白的二级结构、凝胶强度、保水率、水分分布、流变和微观结构等指标的影响,探讨丁香酚添加量对蛋白凝胶形成的作用规律。结果表明,添加低浓度的丁香酚(20 mg/g)显著提升了蛋白的凝胶强度、保水率(P<0.05),凝胶中不易流动水的含量和储能模量明显增加,蒸煮损失和冻融损失显著降低(P<0.05),凝胶中自由水含量减少。然而,当添加高浓度的丁香酚(100 mg/g)时,凝胶强度和保水率明显降低,蒸煮损失、冻融损失明显升高,且在扫描电镜下可清晰地看到凝胶网络结构粗糙、孔隙明显增大。综上,添加低浓度丁香酚(20 mg/g)可以有效地提高蛋白的凝胶特性,其有潜力成为一种新型的肉制品品质改良剂。

关键词：丁香酚肌原纤维蛋白互作凝胶特性流变

维普期刊数据库

同方期刊数据库

Superscattering of water waves

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第7期10卷 91-97页

作者： Zijian Qin Chao Qian Lian Shen Xiaoping Wang Ido Kaminer hongsheng chen Huaping Wang Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Institute of Marine Electronics Engineering Ocean College Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University ZJU-UIUC Institute Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang University Jinhua Institute of Zhejiang University Zhejiang University Department of Electrical Engineering Technion-Israel Institute of Technology

Inspired by the concept of superscattering in optics,we for the first time theoretically predict and experimentally demonstrate the superscattering phenomenon in water *** subwavelength superscatterer is constructed by multi-layered concentric cylinders with an inhomogeneous depth *** superscatterer breaks the long-held single-channel scattering limit by several times and thus significantly enhances the total scattering *** underlying mechanism originates from the near degeneracy of the resonances of multiple *** fabricate the superscatterer prototype and experimentally measure the near-field patterns,which are consistent with theoretical prediction and numerical *** study opens a new avenue to strengthen water-wave scattering and deepen the understanding in water waves,which can be useful for ocean energy harvesting and harbor protection.

关键词： superscattering water wave metamaterials

Full-parameter omnidirectional transformation optical devices

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 92-99页

作者： Yuan Gao Yu Luo Jingjing Zhang Zhengjie Huang Bin Zheng hongsheng chen Dexin Ye Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang University School of Electrical and Electronic Engineering Nanyang Technological University CNRS-InternationalNTU-Thales Research Alliance Nanyang Technological University Institute of Electromagnetic Space Southeast University State Key Laboratory of Millimeter Waves Southeast University International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang University Shaoxing Institute of Zhejiang University Zhejiang University

Transformation optics(TO) provides an unprecedented technique to control electromagnetic(EM) waves by engineering the constitutive parameters of the surrounding medium through a proper spatial transformation. In general, ideal transformation optical devices require simultaneous electric and magnetic responses along all three dimensions. To ease the practical implementation, previous studies usually made use of reduced parameters or other simplified approaches, which inevitably introduce extra reflection or unwanted phase shift. Up to today, experimental realizations of full-parameter transformation optical devices in free space are still quite limited. Here, a general design strategy is proposed to solve this *** a specific example, a full-parameter spatial-compression TO medium with constitutive parameters taking the diagonal form diag(a, a, 1/a) for the TM wave incidence was designed and realized experimentally. Such spatial-compression TO media were then applied to the implementation of an ideal omnidirectional invisibility cloak capable of concealing a large-scale object over a wide range of illumination angles. Both the simulation and experiment confirm that the cloak allows for nearly unity transmission of EM waves in the forward direction without introducing extra scattering or phase shift. This work constitutes an important stepping stone for future practical implementation of arbitrary full-parameter omnidirectional transformation optical devices.

关键词： transformation optical devices omnidirectional impedance matching full-parameter invisibility cloak