检索结果-南通市图书馆

Drag increment induced by a small-scale forward-facing step in Mach number5 turbulent boundary layer flows

Chinese Journal of Aeronautics 2020年第10期33卷 2491-2498页

作者： Yifei XUE jie ren Jinling LUO Song FU School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of NottinghamNottingham NG72RDUnited Kingdom Beijing Aerospace Technology Institute Beijing 100074China

Small-scale roughness elements or imperfections are inevitable over the surface of a flight *** aerodynamics of these small-scale structures is difficult to predict but may play an important role in the design of a flight vehicle at high *** forward-facing step is a typical type of roughness *** experiments have been conducted to study the aerodynamics of supersonic forward-facing step,especially with a step height larger than boundary layer ***,few studies focus on small *** improve the understanding of small-scale forwardfacing step flow,we perform a series of simulations to analyze its aerodynamic influence on a Mach number 5 turbulent boundary *** general flow structures are analyzed and *** shock waves can be induced by the step even if the step height is much smaller than the boundary layer *** significant shocks are the separation shock and the reattachment *** influenced area by the step is *** the increase of the step height,the non-dimensional influence area decreases and gradually converges when the step height reaches the boundary layer *** are two normalized distributions of the skin friction coefficient and pressure coefficient associated with step *** using the normalized parameters,a power-law relationship between the step height and the drag increment coefficient is revealed and fits the simulation results *** is further illustrated that this relationship still holds when changing the inlet angle of attack,but needs slight modification with the angle of attack.

关键词： Aerodynamics Drag increment Forward-facing step Hypersonic flow Turbulent boundary layer

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

HMGB1 promotes the proliferation and invasion of oral squamous cell carcinoma via activating epithelial-mesenchymal transformation

引用

BIOCELL 2019年第3期43卷 199-205页

作者： jie ren QIAN LIANG Department of Stomatology The Sixth Affiliated Hospital of Sun Yat-Sen UniversityGuangzhouChina The Stomatology Hospital of Guangzhou Medical University GuangzhouChina

This study aimed to investigate the role of high mobility group box-1(HMGB1)expression in oral squamous cell carcinoma;HMGB1 promoted the proliferation and invasion of oral squamous cell carcinoma via activating epithelial-mesenchymal transformation(EMT).In this study,RNA transfection was used to silence the expression of HMGB1 in oral squamous cell carcinoma ***-8,cell clone formation and trans-well assays were used to detect the proliferation and invasion of cells before and after HMGB1 ***-PCR and Western blot were used to detect changes in EMT marker protein expression before and after ***1 was significantly higher in OSCC tissues than in adjacent tissues,and of the cell lines examined,HMGB1 was highest in SCC-9 ***,HMGB1 silencing decreased SCC-9 cell proliferation and ***-regulation of HMBG1 expression inhibited not only the proliferation but also the invasion of SCC-9 *** expression of N-cadherin,Snail,and Slug,but not E-cadherin,were promoted after silencing *** expression of HMGB1 in OSCC tissue and cell lines was higher,and HMGB1 silencing decreased SCC-9 cell proliferation and invasion,suggesting that HMGB1 has positive effects on OSCC ***-regulation of HMBG1 expression regulates EMT markers,suggesting that HMBG1 promotes OSCC cell proliferation and invasion is likely to be associated with EMT activation.

关键词： EMT HMGB1 Invasion OSCC Proliferation

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

An interlaminar damage shell model for typical composite structures

引用

Chinese Journal of Aeronautics 2024年第1期37卷 118-137页

作者： jie ZHOU Zhen WU Zhengliang LIU Xiaohui ren School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory of Strength and Structural Integrity Xi’an 710065China School of Mechanical Engineering Xi’an Aeronautical UniversityXi’an 710065China

Using the plate/shell elements in commercial software,accurate analysis of interlaminar initial damage in typical composite structures is still a challenging *** propose an accurate and efficient model for analysis of interlaminar initial damage,the following work is carried out:(A)A higher-order theory is firstly proposed by introducing the local Legendre polynomials,and then a novel shell element containing initial damage prediction is developed,which can directly predict transverse shear stresses without any postprocessing *** variables at each node are independent of number of layers,so the proposed model is more efficient than the 3D-FEM.(B)Compression experiment is carried out to verify the capability of the proposed *** results obtained from the proposed model are in good agreement with experimental data.(C)Several examples have been analyzed to further assess the capability of the proposed model by comparing to the 3D-FEM ***,accuracy and efficiency have been evaluated in different damage criterion by comparing with the selected *** numerical results show that the proposed model can well predict the initial interlaminar damage as well as other ***,the model is implemented with UEL subroutine,so that the present approach can be readily utilized to analyze the initial damage in typical composite structures.

关键词： Compression experiment Finite element method Initial damage Interlaminar stress Plate/shell element

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

Thermodynamic analysis and kinetic optimization of high-energy batteries based on multi-electron reactions

引用

National Science Review 2020年第8期7卷 1367-1386页

作者： Yong-Xin Huang Feng Wu ren-jie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Advanced Technology Research Institute (Jinan) Beijing Institute of Technology Collaborative Innovation Center of Electric Vehicles in Beijing

Multi-electron reaction can be regarded as an effective way of building high-energy systems(>500 W h kg-1). However, some confusions hinder the development of multi-electron mechanisms, such as clear concept, complex reaction, material design and electrolyte optimization and full-cell ***, this review discusses the basic theories and application bottlenecks of multi-electron mechanisms from the view of thermodynamic and dynamic principles. In future, high-energy batteries,metal anodes and multi-electron cathodes are promising electrode materials with high theoretical capacity and high output voltage. While the primary issue for the multi-electron transfer process is sluggish kinetics,which may be caused by multiple ionic migration, large ionic radius, high reaction energy barrier, low electron conductivity, poor structural stability, etc., it is urgent that feasible and versatile modification methods are summarized and new inspiration proposed in order to break through kinetic ***, the remaining challenges and future research directions are revealed in detail, involving the search for high-energy systems, compatibility of full cells, cost control, etc.

关键词： multi-electron reactions thermodynamic kinetics high-energy density metal anodes

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

Boundedness of fractional integral operators on α-modulation spaces

引用

Applied Mathematics(A Journal of Chinese Universities) 2014年第3期29卷 339-351页

作者： WU Xiao-mei CHEN jie-cheng Xingzhi Colledge Zhejiang Normal University Department of Mathematics Zhejiang Normal University

In this paper, we obtain the boundedness of the fractional integral operators, the bilineax fractional integral operators and the bilinear Hilbert transform on α-modulation spaces.

关键词： α-modulation space fractional integral operator bilinear fractional integral operator bilinearHilbert transform.

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

A Biomimetic Surface for Infection-resistance through Assembly of Metal-phenolic Networks

引用

Chinese Journal of Polymer Science 2018年第5期36卷 576-583页

作者： Ru-Jian Jiang Shun-jie Yan Li-mei Tian Shi-Ai Xu Zhi-Rong Xin Shi-Fang Luan Jing-Hua Yin Lu-Quan ren jie Zhao Key Laboratory of Bionic Engineering Ministry of Education Jilin University School of Chemistry and Chemical Engineering Yantai University State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Despite the fact that numerous infection-resistant surfaces have been developed to prevent bacterial colonization and biofilm formation, developing a stable, highly antibacterial and easily produced surface remains a technical challenge. As a crucial structural component of biofilm, extracellular DNA（eDNA） can facilitate initial bacterial adhesion, subsequent development, and final maturation. Inspired by the mechanistic pathways of natural enzymes（deoxyribonuclease）, here we report a novel antibacterial surface by employing cerium（Ce（Ⅳ）） ion to mimic theDNA-cleavage ability of natural enzymes. In this process, the coordination chemistry of plant polyphenols and metal ions was exploited to create an in situ metal-phenolic film on substrate surfaces. Tannic acid（TA） works as an essential scaffold and Ce（Ⅳ） ion acts as both a cross-linker and a destructor of eDNA. The Ce（Ⅳ）-TA modified surface exhibited highly enhanced bacteria repellency and biofilm inhibition when compared with those of pristine or Fe（Ⅲ）-TA modified samples. Moreover, the easily produced coatings showed high stability under physiological conditions and had nontoxicity to cells for prolonged periods of time. This as-prepared DNA-cleavage surface presents versatile and promising performances to combat biomaterial-associated infections.

关键词： Antibacterial surface Metal-phenolic coating DNA-cleavage Biomimetic surface

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

Features of Motion of Soliton Transported Bio-energy in Aperiodic α-Helix ProteinMolecules with Three Channels

引用

Communications in Theoretical Physics 2009年第1期51卷 170-180页

作者： PANG Xiao-Feng LIU mei-jie Institute of High-Energy Electronics University of Electronic Science and Technology of China Chengdu 610065 China International Center for Materials Physics Chinese Academy of Sciences Shenyang 110015 China

The structure aperiodicities can influence seriously the features of motion of soliton excited in the α-helix protein molecules with three channels. We study the influence of structure aperiodicities on the features of the soliton in the improved model by numerical simulation and Runge-Kulta method. The results obtained show that the new soliton is very robust against the structure aperiodieities including large disorder in the sequence of mass of the amino acids and fluctuations of spring constant, coupling constant, dipole-dipole interactional constant, ground state energy and chain-chain interaction. However, very strong structure aperiodieities can also destroy the stability of the soliton in the α-helix protein molecules.

关键词： structure aperiodicity soliton stability protein bio-energy Runge-Kulta method

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

Bio-energy in s-Helix Protein Molecules with Three Properties of Soliton-Transported Channels

引用

Communications in Theoretical Physics 2007年第2X期48卷 369-376页

作者： PANG Xiao-Feng LIU mei-jie Institute of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China International Center for Material Physics the Chinese Academy of Sciences Shenyang 110015 China

We study numerically the propagating properties of soliton-transported bio-energy excited in the a-helix protein molecules with three channels in the cases of the short-time and long-time motions and its features of collision at temperature T = 0 and biological temperature T = 300 K by the dynamic equations in the improved Davydov theory and fourth-order Runge-Kutta method, respectively. From these simulation experiments we see that the new solitons in the improved model can move without dispersion at a constant speed retaining its shape and energy in the cases of motion of both short-time or T = 0 and long time or T = 300 K and can go through each other without scattering in their collisions. In these cases its lifetime is, at least, 120 ps at 300 K, in which the soliton can travel over about 700 amino acid residues. This result is consistent with analytic result obtained by quantum perturbed theory in this model. In the meanwhile, the influences of structure disorder of a-helix protein molecules, including the inhomogeneous distribution of amino acids with different masses and fluctuations of spring constant, dipole-dipole interaction, exciton-phonon coupling constant and diagonal disorder, on the solitons are also studied by the fourth-order Runge-Kutta method. The results show that the soliton still is very robust against the structure disorders and thermal perturbation of proteins at biological temperature 300 K. Therefore we can conclude that the new soliton in the a-helix protein molecules with three channels is a possible carrier of bio-energy transport and the improved model is possibly a candidate for the mechanism of this transport.

关键词： bio-energy transport soliton protein molecule Runge-Kutta method thermal stabilization

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

Multipartite Entanglement in Heisenberg Model

引用

Communications in Theoretical Physics 2008年第6期49卷 1449-1452页

作者： ren jie ZHU Shi-Qun School of Physical Science and Technology Suzhou University Suzhou 215006 China

The effects of anisotropy and magnetic field on multipartite entanglement of ground state in Heisenberg XY model are investigated. The multipartite entanglement increases as a function of the inverse strength of the external field when the degree of anisotropy is finite. There are two peaks when the degree of anisotropy is γ=±1. When the degree of anisotropy increases further, the multipartite entanglement will decrease and tend to a constant. The threshold of the inverse strength of the external field for generating multipartite entanglement generally decreases with the increasing of qubits.

关键词： multipartite entanglement ground state Heisenberg model

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

Attack-Induced Entanglement of Noninteracting Fermi Gas

引用

Communications in Theoretical Physics 2008年第6期49卷 1439-1442页

作者： ren jie ZHU Shi-Qun School of Physical Science and Technology Suzhou University Suzhou 215006 China

The bipartite entanglement in Fermi gas without interaction is investigated when there ace three fermions in the system. The negativity and the yon Neumann entropy are employed to measure the entanglement of the system. The position of the third fermion can affect the entanglement between the first and the second fermions. The entanglement can be enhanced or suppressed when the third fermion changes its position. When the two fermions are at the same position or when their distance is more than 2.0/kF, the third fermion cannot affect them.

关键词： Fermi gas entanglement entropy

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：