检索结果-内蒙古大学图书馆

Numerical and experimental analysis in seismic performance of post-earthquake reinforced concrete frame retrofitted with ECC

引用

ADVANCES IN STRUCTURAL ENGINEERING 2024年第1期27卷 3-16页

作者： Ren, Hongmei zhang, fuwen Mao, Chenxi Fan, Qiaoqiao Lu, Zheng China Earthquake Adm Inst Engn Mech Key Lab Earthquake Engn & Engn Vibrat Harbin Peoples R China Minist Emergency Management Key Lab Earthquake Disaster Mitigat Harbin Peoples R China Shanghai Urban Construction Vocat Coll Sch Digital Construct Shanghai Peoples R China Shanghai Res Inst Bldg Sci Co Ltd Shanghai Key Lab Engn Struct Safety Shanghai Peoples R China Tongji Univ Dept Disaster Mitigat Struct Shanghai Peoples R China Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai Peoples R China Tongji Univ Dept Disaster Mitigat Struct Shanghai Peoples R China

In order to further demonstrate the effectiveness of engineered cementitious composites (ECC) in repairing and strengthening the post-earthquake damaged structure, at the overall structural level, experimental and numerical comparative analysis of structural seismic performance before and after "retrofitted with ECC" is conducted in this paper. A 1:2-scale reinforced concrete frame is tested under cyclic reversed loading and a new ECC material's constitutive model is proposed in this paper for improving the accuracy and feasibility of numerical modelling. The modelling method and newly proposed constitutive model of ECC has been demonstrated to be workable and accurate. Based on numerical and experimental data, the increase of the average yielding displacement after the installation of ECC is relatively significant (80.4% to 156.4%), and the repairing method using ECC in post-earthquake damaged RC frame can restore and even exceed the original frame's load bearing capacity. Comparing the ultimate inter-story drift ratio, the ratio with ECC is about 31.0% higher, indicating that ECC has good deformation capacity and the usage of ECC is indeed an effective method to improve deformation capacity in repairing and strengthening post-earthquake damaged structures. The results confirm the effectiveness and superiority of retrofitting ECC in post-earthquake damaged structures for the reason that the repaired structure can reach the same level of seismic performance as the original structure. The "repairable" characteristic can be used in the design of earthquake resilient structures.

关键词： engineered cementitious composites post-earthquake structure structure strengthening seismic performance numerical analysis cyclic loading

来源：评论

学校读者我要写书评

暂无评论

Realizing number recognition with simulated quantum semi-restricted Boltzmann machine

引用

Communications in Theoretical Physics 2022年第9期74卷 33-38页

作者： fuwen zhang Yonggang Tan Qing-yu Cai School of Physics Zhengzhou UniversityZhengzhou 450001China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430071China School of Physics and Electronic Information Luoyang Normal UniversityLuoyang 471934China Center for Theoretical physics Hainan UniversityHaikou 570228China School of Information and Communication Engineering Hainan UniversityHaikou 570228China

Quantum machine learning based on quantum algorithms may achieve an exponential speedup over classical algorithms in dealing with some problems such as *** this paper,we use the method of training the lower bound of the average log likelihood function on the quantum Boltzmann machine(QBM)to recognize the handwritten number datasets and compare the training results with classical *** find that,when the QBM is semi-restricted,the training results get better with fewer computing *** shows that it is necessary to design a targeted algorithm to speed up computation and save resources.

关键词： machine learning quantum Boltzmann machine quantum algorithm

来源：评论

学校读者我要写书评

暂无评论

Self-centering Aseismic Device Based on Shape Memory Alloy 2

Self-centering Aseismic Device Based on Shape Memory Alloy

引用

2023 2nd International Conference on Materials Engineering and Applied Mechanics, ICMEAAE 2023

作者： Ren, Hongmei zhang, fuwen Peng, Gongsheng School of Digital Construction Shanghai Urban Construction Vocational College Shanghai200438 China Shanghai Research Institute of Building Sciences Co. Ltd. Shanghai200032 China Yihai Kerry Arawana Holdings Co. Ltd. Shanghai200125 China

The seismic performance and quick resilience to build structures after an earthquake are paid more and more attention. The traditional seismic design of structures often adopts increasing the ductility of structures to meet the requirements of stronger earthquakes, but it may cause excessive residual deformation of structures after earthquakes, which leads to the difficulty of post-earthquake repair. The resilient structure can improve the seismic performance of the structure, and at the same time, the damage is concentrated on the dissipative components that can be quickly repaired. This requires the improvement of the seismic performance of the dissipative support, while effectively reducing the residual deformation of the components and enhancing the self-centering ability of the components. In this paper, a shape memory alloy (SMA) self-centering device suitable for rocking wall structure is developed from the aspects of SMA heat treatment, material properties, conceptual design, structural design, and mechanical properties test, so as to achieve a more efficient shock-proof structure with resilient functions. © Published under licence by IOP Publishing Ltd.

关键词： Earthquakes

来源：评论

学校读者我要写书评

暂无评论

Effects of Ga addition on the microstructure and mechanical performance of Sn-58Bi based alloys and the solder joints

引用

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2024年第34期35卷 1-12页

作者： Li, Fusheng Xu, Lei Chen, Mingze zhang, fuwen Wang, Zhigang Liu, Xixue He, Huijun Beijing COMPO Adv Technol Co Ltd Beijing 101407 Peoples R China GRIPM Adv Mat Co Ltd Beijing 101407 Peoples R China

In the research, 0.5 wt. % Ga were added in Sn-58Bi solder to investigate the effect of Ga addition on the microstructure and mechanical performance of Sn-58Bi based solders and corresponding solder joints. Elemental analysis of Ga-bearing bulk solder confirms the existence of solid solution Ga in beta-Sn matrix and network alpha-Ga phase. The result of tensile test and post-test fracture surface analysis indicates that Ga addition improves the ultimate tensile strength, however, it depletes the plasticity by the precipitation of alpha-Ga phase with low melting point. With 0.5 wt. % Ga addition, the eutectic structure was much refined and the interfacial product changes from traditional scallop-like Cu6Sn5 layer to smooth Cu9Ga4 IMCs. In addition, the shear strength of Sn-58Bi solder joint was effectively improved by Ga addition due to the refinement strengthening of solder matrix and the improvement of interfacial IMC morphology. The shear fracture path changes from transgranular fracture in Cu6Sn5 layer to interfacial fracture between solder and Cu9Ga4 IMC layer.

关键词： Tensile testing

来源：评论

学校读者我要写书评

暂无评论

Interfacial IMC growth behavior of Sn-3Ag-3Sb-xIn solder on Cu substrate

引用

SOLDERING & SURFACE MOUNT TECHNOLOGY 2024年第5期36卷 276-284页

作者： Zhou, Jiacheng Shi, Jinglin Xu, Lei zhang, fuwen Wang, Zhigang Hu, Qiang He, Huijun GRINM Grp Ind Res Inst Met Powder Mat Beijing Peoples R China Beijing COMPO Adv Technol Co Ltd Beijing Peoples R China

PurposeThe reliability of solder joints is closely related to the growth of an intermetallic compound (IMC) layer between the lead-free solder and substrate interface. This paper aims to investigate the growth behavior of the interfacial IMC layer during isothermal aging at 125 degrees C for Sn-3Ag-3Sb-xIn/Cu (x = 0, 1, 2, 3, 4, 5 Wt.%) solder joints with different In contents and commercial Sn-3Ag-0.5Cu/Cu solder ***/methodology/approachIn this paper, Sn-3Ag-3Sb-xIn/Cu (x = 0, 1, 2, 3, 4, 5 Wt.%) and commercial Sn-3Ag-0.5Cu/Cu solder were prepared for bonding Cu substrate. Then these samples were subjected to isothermal aging for 0, 2, 8, 14, 25 and 45 days. Scanning electron microscopy and transmission electron microscopy were used to analyze the soldering interface reaction and the difference in IMC growth behavior during the isothermal aging *** the concentration of In in the Sn-3Ag-3Sb-xIn/Cu solder joints exceeded 2 Wt.%, a substantial amount of InSb particles were produced. These particles acted as a diffusion barrier, impeding the growth of the IMC layer at the interface. The growth of the Cu3Sn layer during the aging process was strongly correlated with the presence of In. The growth rate of the Cu3Sn layer was significantly reduced when the In concentration exceeded 3 Wt.%.Originality/valueThe addition of In promotes the formation of InSb particles in Sn-3Ag-3Sb-xIn/Cu solder joints. These particles limit the growth of the total IMC layer, while a higher In content also slows the growth of the Cu3Sn layer. This study is significant for designing alloy compositions for new high-reliability solders.

关键词： Solder joints Growth kinetics Intermetallic compounds Microstructure Reliability

来源：评论

学校读者我要写书评

暂无评论

Shake Table Testing of Masonry Infilled Chuandou Timber Frame Strengthened Using a Simple, Inexpensive Approach

引用

JOURNAL OF EARTHQUAKE ENGINEERING 2023年第9期27卷 2460-2480页

作者： Wang, Zhuolin zhang, fuwen Jiang, Lixue zhang, Yongqun Harries, Kent A. Wang, Yilin Xu, Qingfeng Shanghai Res Inst Bldg Sci Co Ltd Shanghai Key Lab Engn Struct Safety Shanghai 200032 Peoples R China Shandong Jianzhu Univ Minist Educ Key Lab Bldg Struct Retrofitting & Underground Sp Jinan Peoples R China Univ Pittsburgh Dept Civil & Environm Engn Pittsburgh PA USA

The seismic performance of traditional Chuandou timber frame structures having masonry infill is investigated through one-half scale shake table testing. First, the vulnerability of infilled Chuandou frames to out-of-plane collapse of the masonry infill is demonstrated. In view of this weakness, a novel low-cost seismic strengthened method based on flat steel strips and clasp nails was proposed and demonstrated. Results showed that masonry infilled Chuandou timber frames exhibit the dynamic characteristics of masonry structures when subject to low and moderate seismic excitation, and the dynamic characteristics of timber frames at high seismic excitation. The proposed strengthening method was demonstrated to improve the seismic performance of the infilled timber frame. Despite lateral drifts exceeding the recommended maximum value of 1/30, the timber frames themselves exhibited excellent performance with little evidence of distress to the vulnerable mortise-and-tenon connections.

关键词： Masonry infill wall Chuandou timber frame shaking table test seismic strengthening dynamic characteristics

来源：评论

学校读者我要写书评

暂无评论

Investigation of the thermal properties, microstructure, and mechanical properties of Sn-3Ag-3Sb-xIn lead-free solder alloys

引用

SOLDERING & SURFACE MOUNT TECHNOLOGY 2025年第3期37卷 194-204页

作者： Zhou, Jiacheng Shi, Jinglin Yin, Dongfan Xu, Lei zhang, fuwen Wang, Zhigang Hu, Qiang He, Huijun Met Powder Mat Ind Technol Res Inst China GRINM Beijing Peoples R China Beijing COMPO Adv Technol Co Ltd Beijing Peoples R China Gen Res Inst Nonferrous Met Beijing Peoples R China GRIPM Adv Mat Co Ltd Beijing Peoples R China

PurposeThis study aims to investigate the impact of indium (In) content on the thermal properties, microstructure and mechanical properties of Sn-3Ag-3Sb-xIn (x = 0, 1, 2, 3, 4, 5 Wt.%) solders to enhance the performance of tin-based solder under demanding conditions and to meet the urgent need for high-reliability microelectronic interconnection materials in emerging sectors such as automotive intelligent technology, 5G communication technology and high-performance ***/methodology/approachIn this study, Sn-3Ag-3Sb-xIn solder alloys were prepared. The thermal properties of the solder alloys were characterised by differential scanning calorimetry. Subsequently, optical microscopy, scanning electron microscopy, X-ray diffraction and an electron probe X-ray microanalyser were used to analyse the influence of the In content on the microstructure of the solder. The mechanical properties of solder alloys were determined through tensile *** the In content increased, the melting temperature of the Sn-3Ag-3Sb-xIn solder decreased, accompanied by less nucleation undercooling and an expanded melting range. The incorporation of In led to an enhancement in the yield and tensile strengths of the Sn-3Ag-3Sb-xIn solder alloys, but with a concomitant decrease in plasticity. In comparison to commercial Sn-3.0Ag-0.5Cu solder alloys, the yield strength and tensile strength of the Sn-3Ag-3Sb-3In alloy increased by 8.64 and 21.69 MPa, respectively, while the elongation decreased by 11.48%.Originality/valueSn-3Ag-3Sb-3In solder alloy was the most appropriate and expected comprehensive properties. The enhancements will provide substantial assistance and precise data references for the interconnection requirements in high-strength interconnection fields, such as automotive intelligent technology, 5G communication technology and high-performance computing.

关键词： Lead-free solder Microstructure Mechanical properties Indium addition

来源：评论

学校读者我要写书评

暂无评论

从中国式现代化看中共十二大的战略意义

引用

现代哲学 2024年第2期 1-8页

作者：张富文上海大学马克思主义学院上海200444 上海大学中共党史党建研究院高校中国共产党伟大建党精神研究中心上海大学分中心

中共十二大是中国共产党在重要历史关头从战略上认识、分析、判断重大历史课题的典范。作为在历史的转折点上召开的全党代表大会,党的十二大从发展道路、建设目标、精神文明、领导核心“四位一体”的辩证统一,提出对中国式现代化具有战... 详细信息

中共十二大是中国共产党在重要历史关头从战略上认识、分析、判断重大历史课题的典范。作为在历史的转折点上召开的全党代表大会,党的十二大从发展道路、建设目标、精神文明、领导核心“四位一体”的辩证统一,提出对中国式现代化具有战略意义的重大历史课题。党的十二大提出了“走自己的路”,开辟出新道路,为中国式现代化从道路上开拓奠基;提出开创社会主义现代化新局面,进行总体战略设计,为中国式现代化提供战略指引;提出建设高度的社会主义精神文明,把精神文明建设上升到社会主义建设的战略高度,为中国式现代化提供精神支撑;提出把党建设成为领导社会主义现代化事业的坚强核心,为中国式现代化提供组织保证。

关键词：中国共产党战略中共十二大中国式现代化

来源：评论

学校读者我要写书评

暂无评论

High-temperature stability of Ba0.99Ca0.01Z0.02Ti0.98O3-doped LiTaO3 lead-free ceramics

引用

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2022年第8期33卷 5878-5885页

作者： zhang, Liyun Ma, Jiafeng zhang, fuwen Hu, Guanghui Li, Tian Liu, Ying Cheng, Yong Jiang, Aihua Guilin Univ Technol Coll Sci Guilin 541004 Guangxi Peoples R China

In this work, Ba(0.99)Ca(0.01)Z(0.02)Ti(0.98)O(3)-xLiTaO(3) (x = 0, 0.05%, 0.10%, 0.15%, 0.20%, Shorthand for BCZT-xLT) lead-free piezoelectric materials were successfully prepared by high-temperature solid-state reaction method, and the ingredients were calculated according to the theoretical composition of the chemical formula. The effects of LT doping on phase structure, microstructure, dielectric properties, and piezoelectric properties of BCZT-xLT ceramics were studied. The results show that a single perovskite structure is formed after doped LT, and a small amount of LT can improve the piezoelectric and dielectric properties of BCZT. When the doping amount is 0.1%, the Curie temperature is moved to a higher temperature of 129 degrees C. In addition, the ceramics with x = 0.1% sintered at 1440 degrees C exhibit enhanced properties of the piezoelectric coefficient (d(33) similar to 361 pC/N), planar electromechanical coupling coefficient (k(p) similar to 40.8%), mechanical figure of merit (Q(m) similar to 192.4), remnant polarization (P-r similar to 16.6 mu C /cm(2)), and coercive field (E-c similar to 1.3 kV/cm).

关键词： Piezoelectricity

来源：评论

学校读者我要写书评

暂无评论

Evaluation of individualized treatment of nonproliferative diabetic retinopathy:a multicenter,randomized,parallel-controlled study

引用

Journal of Traditional Chinese Medicine 2022年第1期42卷 90-95页

作者： HUO Jian DUAN Junguo LIU Lisha zhang fuwen ZHU Keyu SUI Jiaqing JIAN Wenyuan Department of Ophthalmology Chengdu Women's and Children's Central HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 611731China College of Ophthalmology Chengdu University of Traditional Chinese MedicineChengdu 610075China

OBJECTIVE:To evaluate the differences in the efficacy of stationary treatment and individualized treatment for patients with nonproliferative diabetic retinopathy(NPDR).METHODS:This study was a randomized,controlled,multicenter clinical *** with NPDR were randomized into the stationary treatment group or the individualized treatment *** stationary treatment group was given the basic treatment and Qiming granules,and the individualized treatment group was given the basic treatment,Qiming granules,and individualized Chinese herbal medicines over a 12-week *** individualized therapeutic formula was also changed over time to adjust to the changes in the clinical presentation of the *** conducted observations of fundus retinal exudation and hemorrhage,visual acuity,Traditional Chinese Medicine symptom scores and other ***:A total of 140 participants with NPDR were randomized into the stationary treatment group or the individualized treatment group,and 132 participants completed this *** the 12-week treatment,significant improvements in both primary and secondary outcomes were observed in the stationary and individualized treatment *** remarkable difference in the primary outcomes between the two groups was ***,there was a significant difference in the Traditional Chinese Medicine symptom scores(18±7 vs 15±6;P<0.05).There were no severe adverse ***:Compared with stationary treatment,individualized treatment is more effective at relieving the Traditional Chinese Medicine symptoms and improving vision and fundus lesions at 12 weeks post treatment.

关键词： diabetic retinopathy individualized treatment randomized controlled trial Qiming granules

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：