检索结果-南通市图书馆

Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

引用

Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-Jun Zhang Wen-Wei Wang Jing-Shui Zhen bo-cheng li De-cheng Cai Yang-Yang Du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model

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

Relationship between polyhedral structures formed by tangent planes of ellipsoidal particles and system sound velocity

引用

Chinese Physics B 2024年第11期33卷 448-456页

作者： cheng-bo li lin Bao Chuang Zhao School of Materials Science and Engineering Anyang Institute of TechnologyAnyang 455000China College of Physics Guizhou UniversityGuiyang 550025China

Internal polyhedral structures of a granular system can be investigated using the Voronoi *** technique has gained increasing recognition in research of kinetic properties of granular *** systems with mono-sized spherical particles,Voronoi tessellations can be utilized,while radial Voronoi tessellations are necessary for analyzing systems with multi-sized spherical ***,research about polyhedral structures of non-spherical particle systems is *** utilize the discrete element method to simulate a system of ellipsoidal particles,defined by the equation(x a)2+(y1)2+(z 1/a)2=1,where a ranges from 1.1 to *** system is then dissected by using tangent planes at the contact points,and the geometric quantities of the resulting polyhedra in different shaped systems,such as surface area,volume,number of vertices,number of edges,and number of faces,are ***,the longitudinal and transverse wave velocities within the system are calculated with the time-of-flight *** results demonstrate a strong correlation between the sound velocity of the system and the geometry of the dissected *** sound velocity of the system increases with the increase in a,peaking at a=1.3,and then decreases as a continues to *** average volume,surface area,number of vertices,number of edges,and number of faces of the polyhedra decrease with the increase in sound *** is,these quantities initially decrease with the increase in a,reaching minima at a=1.3,and then increase with further increase of *** relationship between sound velocity and the geometric quantities of the dissected polyhedra can serve as a reference for acoustic material design.

关键词： discrete element method Voronoi tessellation polyhedral structure sound velocity

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

Influence of particle packing structure on sound velocity

引用

Chinese Physics B 2018年第10期27卷 386-394页

作者： Chuang Zhao cheng-bo li lin Bao College of Physics Guizhou UniversityGuiyang 550025China College of Mathematics and Physics Anyang Institute of TechnologyAnyang 455000China

The anisotropy in the particle systems of different packing structures affects the sound velocity. The acoustic propagation process in four kinds of packing structures（denoted as S45, H60, S90, and D） of two-dimensional granular system is simulated by the discrete element method. The velocity vtof obtained by the time of flight method and the velocity vc obtained from the stiffness tensor of the system are compared. Different sound velocities reflect various packing structures and force distributions within the system. The compression wave velocities of H60 and S90 are nearly the same, and transmit faster than that of D packing structure, while the sound velocity of S45 is the smallest. The shear wave velocities of S45 and H60 are nearly the same, and transmit faster than that of D packing structure. The compression wave velocity is sensitive to the volume fraction of the structure, however, the shear wave velocity is more sensitive to the geometrical structure itself. As the normal stress p is larger than 1 MPa, vtof and vc are almost equal, and the stiffness tensors of various structures explain the difference of sound velocities. When the normal stress is less than 1 MPa, with the coordination number unchanged, the law vtof ∝ p^1/4 still exists. This demonstrates that apart from different power laws between force and deformation as well as the change of the coordination number under different stresses, there are other complicated causes of vtof∝ p^1/4, and an explanation of the deviation from vtof ∝ p^1/6 is given from the perspective of dissipation.

关键词： discrete element method acoustic propagation packing structure stiffness tensor

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

Neural network-based matrix effect correction in EDXRF analysis

引用

Nuclear Science and Techniques 2008年第5期19卷 278-281页

作者： TUO Xianguo cheng bo MU Keliang li Zhe chengdu University of Technology Chengdu 610059 China

In this paper we discuss neural network-based matrix effect correction in energy dispersive X-ray fluorescence (EDXRF) analysis,with detailed algorithm to classify the *** method can correct the matrix effect effectively through classifying the samples automatically,and influence of X-ray absorption and enhancement by major elements of the samples is *** for the complex matrix effect correction in EDXRF analysis of samples in Pangang showed improved accuracy of the elemental analysis result.

关键词：能量耗散X射线荧光分析神经网络聚类分析基体效应烧结矿物

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

Study of the pulsed working characteristics of the penning ion source for neutron tubes

引用

Nuclear Science and Techniques 2000年第3期11卷 150-154页

作者： LU Hong-bo, YUE cheng-bo, li Wen-Sheng, ZHAI Wei-Dong, JIANG Zhong-Jing, WEI Bao-Jie (Department of Physis, the Northeast Normal University, Changchun 130024) 西北师范大学甘肃长春 130024

The pulsed working characteristics of the neutron tube ion source were studied experimentally. The principle and method of selecting the gas pressure and anode voltage were determined.

关键词：加速器离子源中子管脉冲宽度阳极电压实验研究

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 New Construction Method for the Dual Tree Complex Wavelet Based on Direction Sensitivity

引用

自动化学报 2006年第1期32卷 47-53页

作者： WANG Hong-Xia CHEN bo cheng li-Zhi Department of Mathematics ＆ System Science National University of Defense Technology Changsha 410073

The conception of 'main direction' of multi-dimensional wavelet is established in this paper, and the capabilities of several classical complex wavelets for representing directional singularities are investigated based on their main directions. It is proved to be impossible to represent directional singularities optimally by a multi-resolution analysis (MRA) of L2(R2). Based on the above results, a new algorithm to construct Q-shift dual tree complex wavelet is proposed. By optimizing the main direction of parameterized wavelet filters, the difficulty in choosing stop-band frequency is overcome and the performances of the designed wavelet are improved too. Furthermore, results of image enhancement by various multi-scale methods are given, which show that the new designed Q-shift complex wavelet do offer significant improvement over the conventionally used wavelets. Direction sensitivity is an important index to the performance of 2D wavelets.

关键词：复合微波对偶树图象增加灵敏性

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

Grain refinement of Mg−Al binary alloys inoculated by in-situ oxidation

引用

Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3212-3221页

作者： Heng-bin liAO li-ling MO cheng-bo li Mei-yan ZHAN Jun DU School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China School of Materials and Environment Guangxi University for NationalitiesNanning 530006China

Utilizing oxide inclusion to induce heterogeneous nucleation event is an available method to achieve grain *** this study,Mg−Al binary alloys were refined by inoculation of in-situ oxidation *** show that MgO and MgAl_(2)O_(4) phases are primary oxide products for Mg−xAl alloys inoculated by in-situ *** pure Mg and Mg−1Al alloy,MgO is the only oxide ***_(2)O_(4) is another oxide product for Mg−xAl alloy as Al content increases to 3 wt.%.For Mg−3Al alloy,average grain size significantly decreases from 1135 to 237μm,with a high grain refining ratio of 79.1%.both MgO and MgAl_(2)O_(4) possess nucleating potency forα-Mg ***_(2)O_(4) exhibits a higher nucleating potency due to the lower misfit withα-*** grain refinement of Mg−xAl alloys inoculated by in-situ oxidation process is attributed to heterogeneous nucleation events ofα-Mg grains on MgO or MgAl_(2)O_(4) particles.

关键词： Mg−Al alloy grain refinement heterogeneous nucleation MgO MgAl_(2)O_(4)

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

Design and preparation of Al-Fe-Ce ternary aluminum alloys with high thermal conductivity

引用

Transactions of Nonferrous Metals Society of China 2022年第6期32卷 1781-1794页

作者： Gan LUO Xiong ZHOU cheng-bo li Jun DU Zheng-hua HUANG School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Guangdong–Hong Kong Joint Research and Development Center on Advanced Manufacturing Technology for light Alloys Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China School of Materials and Environment Guangxi University for NationalitiesNanning 530006China

Ce element was introduced to modify Al−2%Fe(mass fraction)binary *** microstructures,crystallization behavior,electrical/thermal conductivities and mechanical properties of these alloys were systematically *** results indicated that the appropriate Ce addition decreased the recalescence temperature and growth temperature of Al−Fe eutectic structure,improved the morphology and distribution of Fe-containing phase,and simultaneously increased the conductivity and mechanical *** annealed treatment improved the thermal conductivity of these alloys due to the decreasing concentration of point *** process further broke up the coarser Fe-containing phases into finer particles and made the secondary phases uniformly distributed in theα(Al)*** subsequent annealing treatment and rolling deformation,the thermal conductivity,ultimate tensile strength and hardness of the Al−2%Fe−0.3%Ce(mass fraction)alloy reached 226 W/(m·K),(182±1.4)MPa and HBW(49.5±1.7),respectively.

关键词： Al−Fe−Ce alloys Ce modification thermal conductivity mechanical properties

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

秦汉时期吏卒归宁制度新探

引用

湖南大学学报（社会科学版） 2017年第5期31卷 20-25页

作者：程博丽湖南大学岳麓书院湖南长沙410082

丧假为秦汉时期吏卒休假名目之一种。传世文献中所记录的丧葬礼俗,多关涉二千石以上的高级官僚,丧制屡经变革。出土的简牍材料则从法律与行政的层面反映了更为基层的且显著不同的吏卒宁告面貌。包括吏卒的具体指涉与行丧的对象、丧假的... 详细信息

丧假为秦汉时期吏卒休假名目之一种。传世文献中所记录的丧葬礼俗,多关涉二千石以上的高级官僚,丧制屡经变革。出土的简牍材料则从法律与行政的层面反映了更为基层的且显著不同的吏卒宁告面貌。包括吏卒的具体指涉与行丧的对象、丧假的长短变化、宁毕服役等问题。由秦至汉,既有承袭,又有区别。秦时丧假政策较为严苛,至汉则删繁就简,显示了国家的"体恤"态度。与此同时,为家中女性成员的奔丧规制,显示了当时社会里母亲的较高地位和作为妻子的女性逐步受到重视。

关键词：秦汉吏卒归宁出土简牍

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

Formative mechanism of intracanal fracture fragments in thoracolumbar burst fractures： a finite element study

引用

Chinese Medical Journal 2013年第15期126卷 2852-2858页

作者： ZENG Zhi-li ZHU Rui li Shan-zhu YU Yan WANG Jian-jie JIA Yong-wei CHEN bo cheng li-ming Tongji Univ Sch Med Tongji Hosp Dept Spine Surg Shanghai 200065 Peoples R China Tongji Univ Sch Life Sci & Technol Shanghai 200092 Peoples R China

Background Thoracolumbar burst fracture is a common clinical injury, and the fracture mechanism is still controversial. The aim of this research was to study the formation of intracanal fracture fragments in thoracolumbar burst fractures and to provide information for the prevention of thoracolumbar bursts fractures and reduction of damage to the nervous system. Methods A nonlinear three-dimensional finite element model of T11-L3 segments was established, and the injury processes of thoracolumbar bursts were simulated. The intact finite element model and the finite element model after the superior articular were impacted by 100 J of energy in different directions. The distribution and variation of stress in the superior posterior region of the L1 vertebral body were analyzed. Abaqus 6.9 explicit dynamic solver was used as finite element software in calculations. Results A three-dimensional nonlinear finite element model of the thoracolumbar spine was created. In the intact model, stress was concentrated in the superior posterior region of the L1 vertebral body. The stress peak was a maximum for the extension impact load and a minimum for the flexion impact load. The stress peak and contact force in the facet joint had close correlation with time. The stress peak disappeared after excision of the superior articular process. Conclusions The three-dimensional nonlinear finite element model was suitable for dynamic analysis. The contact force in the facet joint, which can be transferred to the superior posterior vertebral body, may explain the spinal canal fragment in thoracolumbar burst fractures.

关键词： thoracolumbar vertebra burst fracture finite element model injury

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

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：