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Low-temperature joining method for refractory metals tantalum and titanium 认领 引用
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作者 Yan-fei CHEN Zheng-qiang ZHU +4 位作者 MAmir SIDDIQ Ke LI Fan-rong AI Liang SUN Zhi-gang WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1548-1563,共16页
A novel solid-state joining approach was proposed,demonstrating the feasibility of effectively joining refractory metals at relatively low temperatures.Employing advanced characterization techniques,the underlying mec... A novel solid-state joining approach was proposed,demonstrating the feasibility of effectively joining refractory metals at relatively low temperatures.Employing advanced characterization techniques,the underlying mechanisms governing the bonding of tantalum(Ta)and titanium(Ti)were systematically investigated.The results reveal that Ta-Ti metallurgical bonding occurs at a peak temperature of approximately 600℃,representing 18.15% and 32.61% of the melting points of Ta and Ti,respectively.Ultrasonic vibrations can facilitate the phase transformation of Ti from hexagonal close-packed(HCP)α-Ti to body-centered cubic(BCC)β-Ti,effectively enhancing its plasticity and enabling mechanical interlocking with Ta.Additionally,ultrasonic vibrations can promote atomic diffusion at the Ta-Ti interface,leading to the formation of a transition layer with a thickness ranging from 0.3 to 0.8μm at the bonding interface,which substantially improves the bonding strength of Ta-Ti joint. 展开更多
关键词 solid-state joining ultrasonic vibration tantalum titanium joining mechanism
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Progress in stress-relieving methodologies of ceramic matrix composites/Ni-based superalloys joints:A review 认领 引用
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作者 Ying-xin WANG Fu WANG +4 位作者 Qiang YANG Di-chen LI Zai-wang HUANG Yun-song ZHAO Jian-tao WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第6期1685-1711,共27页
Ceramic matrix composites(CMCs)are regarded as promising high-temperature materials for industrial applications due to their exceptional properties at elevated temperatures.However,their limited manufacturability rest... Ceramic matrix composites(CMCs)are regarded as promising high-temperature materials for industrial applications due to their exceptional properties at elevated temperatures.However,their limited manufacturability restricts their capability to be produced as complex,large-scale structural components.Ni-based superalloys are well-known for their outstanding performance under high-temperature conditions.The integration of these two material types to create hybrid components can significantly broaden their applications in engineering.A critical challenge arises from the interfacial residual stresses that develop at the joints of CMCs and Ni-based superalloys,which can severely impair the performance of the hybrid components.The mechanisms behind the formation of residual stress in CMCs/Ni-based superalloys joints are reviewed,including thermal expansion coefficient(CTE)mismatch,thermal gradient difference,and phase transformation,and various methodologies for alleviating these stresses are summarized,including interlayer techniques,composite filler approaches,and interface structure design strategies.Finally,the challenges and future trends in mitigating interfacial stress in CMCs/Ni-based superalloys joints are discussed. 展开更多
关键词 ceramic matrix composites Ni-based superalloy joining residual stress relieving methodologies
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应用Join point回归模型分析某区法定传染病流行趋势 认领 引用
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作者 杨韫 张文增 +1 位作者 冀国强 武之琳 《中外女性健康研究》 2026年第5期179-182,186,共4页
目的:研究北京市某区法定传染病十余年的流行趋势,分析主要传染病趋势特征,为本区制定传染病防控策略和提高居民健康水平提供科学依据。方法:收集整理全民健康信息化预防控制信息系统中2011~2024年法定传染病年报数据和年龄别人口数,描... 目的:研究北京市某区法定传染病十余年的流行趋势,分析主要传染病趋势特征,为本区制定传染病防控策略和提高居民健康水平提供科学依据。方法:收集整理全民健康信息化预防控制信息系统中2011~2024年法定传染病年报数据和年龄别人口数,描述不同传染病的发病率变化趋势,利用Join point回归模型拟合年发病率变化趋势并进行统计分析。结果:该区法定传染病总体发病率呈波动状态,但趋势无统计学意义(AAPC=12.56%,P=0.19),其中甲乙类传染病发病率呈平稳波动态势(AAPC=16.42%,P=0.21),丙类传染病(AAPC=11.20%,P=0.01)发病率呈上升态势;传播途径以呼吸道传染病为主(占比65.13%),其次为肠道传染病(32.49%),血源及性传播传染病(3.21%)和其他自然疫源及虫媒传染病(0.16%)占比较低。结论:该区传染病防控形势依然严峻,呈现多传播途径共存、重点病种动态演变的流行特征,未来需结合流行趋势强化重点人群干预,推进精准化、差异化防控措施。 展开更多
关键词 法定传染病 发病率 流行趋势 Join point回归
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基于Fork/Join框架的并行期望最大算法实现与仿真 认领 引用
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作者 孙晓静 王天赐 +1 位作者 关智超 朱红磊 《信息技术与信息化》 2026年第4期130-133,共4页
为解决期望最大算法(expectation-maximum,EM)在处理大规模数据时存在计算时间开销过长问题,文章设计了一种基于Fork/Join框架实现并行多任务快速处理大规模数据的EM方法。该方法引入并应用Fork/Join在EM算法的每一次迭代过程中,通过创... 为解决期望最大算法(expectation-maximum,EM)在处理大规模数据时存在计算时间开销过长问题,文章设计了一种基于Fork/Join框架实现并行多任务快速处理大规模数据的EM方法。该方法引入并应用Fork/Join在EM算法的每一次迭代过程中,通过创建ForkJoinTask任务和线程池,采用对任务进行拆分和并行处理方式,实现数据的并行计算处理。实验结果表明,采用所设计方法在计算似然估计和期望结果时,比常规EM算法减少计算时间约2/3,极大提高了算法处理大规模数据的效率,降低了时间开销。 展开更多
关键词 期望最大 并行多任务 Fork/Join框架 大规模数据 仿真
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Electrically assisted pressure joining of dissimilar copper C11000 and aluminum 6061-T6 alloys 认领 引用
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作者 Tu-Anh Bui-Thi Thanh Thuong Do +3 位作者 Van Cong Phan Sung-Tae Hong Yijae Kim Heung Nam Han 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第31期90-101,共12页
The effect of current density on electrically assisted solid-state bulk joining,so-called electrically assisted pressure joining(EAPJ),of copper(Cu)C11000 and aluminum(Al)6061-T6 alloys is investigated.During EAPJ,var... The effect of current density on electrically assisted solid-state bulk joining,so-called electrically assisted pressure joining(EAPJ),of copper(Cu)C11000 and aluminum(Al)6061-T6 alloys is investigated.During EAPJ,various combinations of electric current density and duration are applied to the cylindrical specimen assembly to reach a fixed peak temperature during continuous axial compressive plastic deformation.Then,an additional electric current is periodically applied to the specimen assembly without plastic deformation to keep the temperature elevated.Microstructural observation confirms that the defect-free joint of the selected material combination is fabricated without melting and solidification.The athermal effect of electric current on the diffusion enhancement can be accommodated by introducing the effective activation energy or the effective temperature.The microstructural analysis also demonstrates that the current density both increases the thickness of the intermetallic compound(IMC)layer at the joint interface and affects the microstructural evolution of joining materials.Finally,the mechanical properties of the joint are strongly affected by the electric current density.The present study provides insight into the effect of electric current density on the solid-state joining mechanism of EAPJ of dissimilar material combinations. 展开更多
关键词 Solid-state joining Electrically assisted pressure joining Copper C11000 Aluminum AA6061-T6 Electroplasticity Current density
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Ultrasonic vibration-assisted joining of multiform metallic glasses in varied environments 认领 引用
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作者 Lu-Yao Li Jian-Yu Chen +9 位作者 Li-Xing Zhu Yu Zhang Jian Zhu Xin Li Wei Li Kang-Yu Lin Xing-Ran Zhao Xiao-Di Liu Chen-Chen Yuan Jiang Ma 《Rare Metals》 SCIE EI CAS CSCD 2025年第12期10761-10775,共15页
The evolution of joining technologies has profoundly propelled advancements across human civilization.Although modern joining processes have attained remarkable sophistication in conventional manufacturing,constructio... The evolution of joining technologies has profoundly propelled advancements across human civilization.Although modern joining processes have attained remarkable sophistication in conventional manufacturing,construction,and aerospace applications,their operational adaptability in special environments—including underwater,hyper-corrosive,explosive,and cryogenic conditions—remains fundamentally constrained.This limitation underscores the critical demand for facile and robust joining methodologies tailored for specialized environments.Here,we present an innovative strategy using ultrasonic vibration to enable joining across diverse metallic glasses morphologies under these demanding conditions.Leveraging ultrasonic vibration-induced plasticity and the unique activation mechanisms of metallic glasses,this approach demonstrates unprecedented compatibility with bulk,ribbon,and powder forms.Distinct engineered joint structures emerge across different materials,achieving mechanical strengths comparable to parent materials(1904 MPa compressive strength).This breakthrough establishes a transformative platform for offshore,polar,oil-gas,and space engineering applications and pioneers a universal design way for materials with programmable performance characteristics. 展开更多
关键词 Varied environments Joining Metallic glasses Ultrasonic Vibration
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Numerical Simulation Analysis of FSPR Joint Forming for Steel / Al Alloy Hybrid Body⁃in⁃White 认领 引用
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作者 Lijun Han Rui Wang Fuyang Liu 《Journal of Harbin Institute of Technology(New Series)》 CAS 2025年第3期46-53,共8页
The development and application of large Die⁃Casting Al Alloy(DCAA)parts and Thermo⁃Formed Steel Sheets(TFSS)in Body⁃in⁃White(BIW)have created higher demands for the joining technology of high⁃strength steel/Al dissim... The development and application of large Die⁃Casting Al Alloy(DCAA)parts and Thermo⁃Formed Steel Sheets(TFSS)in Body⁃in⁃White(BIW)have created higher demands for the joining technology of high⁃strength steel/Al dissimilar materials.As an emerging technology,Flush Self⁃Piercing Riveting(FSPR)is still in the experimental phase and undergoing small batch equipment verification.This paper focuses on the joining methods for DCAA and TFSS in BIW,investigating the joining mechanisms,technical features,and forming principles of FSPR for steel/Al dissimilar materials with two⁃layer or three⁃layer plate combinations.Considering the TL4225/C611/CR5 sheet combination as a subject,the forming mechanism of high⁃quality joints was studied,and a physical and mathematical model was established to depict the relationship between the filling amount of the arc⁃gap and die dimensions,as well as the extrusion amount.This model effectively illustrates the relationship between the filling amount of the flowing metal in the arc⁃gap and critical parameters,such as die dimensions and feeding amounts.By simplifying the process of selecting joining parameters,it significantly reduces both the time and experimental workload associated with parameter selection.This provides a technical foundation for the application of DAAA and TFSS parts in BIW,enabling the rapid choice of appropriate joining parameters to meet the requirements for obtaining high⁃quality joints.The model can be effectively utilized to investigate the relationships between key parameters,including arc⁃gap radius,plate thickness,rivet arc radius,nail head radius,groove width,and feeding amount,while keeping other parameters constant.This approach provides a theoretical foundation for the design of Friction Stir Processing(FSP)joints and aids in the selection of optimal parameters. 展开更多
关键词 flush self⁃piercing riveting(FSPR) joining die⁃casting Al alloy(DCAA) thermo⁃formed steel sheets(TFSS) two or three⁃layer plate
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Discrepant involvement of homologous repair and non-homologous end joining pathways in maize development and growth 认领 引用
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作者 Shuanghui Zhao Leiming Zheng +5 位作者 Minghui Zheng Menghan Li Shuyue Li Nan Wu Yan He Jinghan Liu 《The Crop Journal》 SCIE CAS CSCD 2025年第2期406-417,共12页
Chromosomal DNA double-strand breaks(DSBs)are often generated in the genome of all living organisms.To combat DNA damage,organisms have evolved several DSB repair mechanisms,with nonhomologous end-joining(NHEJ)and hom... Chromosomal DNA double-strand breaks(DSBs)are often generated in the genome of all living organisms.To combat DNA damage,organisms have evolved several DSB repair mechanisms,with nonhomologous end-joining(NHEJ)and homologous recombination(HR)being the two most prominent.Although two major pathways have been extensively studied in Arabidopsis,rice and other mammals,the exact functions and differences between the two DSB repair pathways in maize still remain less well understood.Here,we characterized mre11a and rad50,mutants of HR pathway patterns,which showed drastic degradation of the typically persistent embryo and endosperm during kernel development.Loss of MRE11 or RAD50 function led to chromosomal fragments and chromosomal bridges in anaphase.While we also reported that the NHEJ pathway patterns,KU70 and KU80 are associated with developmental growth and genome stability.ku70 and ku80 both displayed an obvious dwarf phenotype.Cytological analysis of the mutants revealed extensive chromosome fragmentation in metaphase and subsequent stages.Loss of KU70/80 function upregulated the expression of genes involved in cell cycle progression and nuclear division.These results provide insights into how NHEJ and HR are mechanistically executed during different plant developmental periods and highlight a competitive and complementary relationship between the NHEJ and HR pathways for DNA double-strand break repair in maize. 展开更多
关键词 Homologous recombination Non-homologous end joining Double-strand break Maize
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An Overview of Self-piercing Riveting Process with Focus on Joint Failures, Corrosion Issues and Optimisation Techniques 认领 引用 被引量：18
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作者 Hua Qian Ang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第1期89-113,共25页
Self-piercing riveting(SPR)is a cold forming technique used to fasten together two or more sheets of materials with a rivet without the need to predrill a hole.The application of SPR in the automotive sector has becom... Self-piercing riveting(SPR)is a cold forming technique used to fasten together two or more sheets of materials with a rivet without the need to predrill a hole.The application of SPR in the automotive sector has become increasingly popular mainly due to the growing use of lightweight materials in transportation applications.However,SPR joining of these advanced light materials remains a challenge as these materials often lack a good combination of high strength and ductility to resist the large plastic deformation induced by the SPR process.In this paper,SPR joints of advanced materials and their corresponding failure mechanisms are discussed,aiming to provide the foundation for future improvement of SPR joint quality.This paper is divided into three major sections:1)joint failures focusing on joint defects originated from the SPR process and joint failure modes under different mechanical loading conditions,2)joint corrosion issues,and 3)joint optimisation via process parameters and advanced techniques. 展开更多
关键词 Self-piercing riveting Mechanical joining Joint defects Failure mechanisms Corrosion Joint optimisation
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并行数据库中JOIN运算的并行算法 认领 引用 被引量：2
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作者 黄明和 钟萃相 《计算机工程与科学》 2006年第2期90-92,共3页
JOIN运算的并行算法一直是并行数据库领域中研究的热点问题,先后出现了一系列并行JOIN算法或改进算法,但它们都存在着通信效率较低、负载调度频繁等问题。本文针对这些问题,在分析比较前人工作的基础上对SABJ+算法与ABJ+算法加以改进,... JOIN运算的并行算法一直是并行数据库领域中研究的热点问题,先后出现了一系列并行JOIN算法或改进算法,但它们都存在着通信效率较低、负载调度频繁等问题。本文针对这些问题,在分析比较前人工作的基础上对SABJ+算法与ABJ+算法加以改进,得到了效率更高的并行JOIN算法ABJ++。 展开更多
关键词 串行JOIN算法 并行JOIN算法 并行Hash JOIN算法 分桶
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基于Fork/Join模式的模幂算法并行化实现 认领 引用
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作者 张翔 《计算机应用文摘》 2025年第20期244-246,249,共3页
公钥加密与数字签名算法普遍依赖于模幂运算,而大整数模幂运算的核心瓶颈在于高计算复杂度的乘法与幂运算.在现有研究基础上,文章系统分析了二元法、Karatsuba算法及快速傅里叶变换(FFT)在模幂运算中的应用特点,并针对其计算效率与资源... 公钥加密与数字签名算法普遍依赖于模幂运算,而大整数模幂运算的核心瓶颈在于高计算复杂度的乘法与幂运算.在现有研究基础上,文章系统分析了二元法、Karatsuba算法及快速傅里叶变换(FFT)在模幂运算中的应用特点,并针对其计算效率与资源消耗进行了相应优化.进一步地,基于Java语言环境,采用多线程Fork/Join框架实现改进算法,以提升并行计算性能与整体运算效率. 展开更多
关键词 模幂 Karatsuba FFT Java Fork/Join
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The Crossing Number of Two Classes of Join Graphs 认领 引用
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作者 LU Shengxiang WANG Shu WANG Jing 《数学进展》 CSCD 北大核心 2025年第5期983-991,共9页
Determining the crossing number of a given graph is NP-complete. The cycle of length m is denoted by Cm = v1v2…vmv1. G(1)m (m ≥ 5) is the graph obtained from Cm by adding two edges v1v3 and vlvl+2 (3 ≤ l ≤ m... Determining the crossing number of a given graph is NP-complete. The cycle of length m is denoted by Cm = v1v2…vmv1. G(1)m (m ≥ 5) is the graph obtained from Cm by adding two edges v1v3 and vlvl+2 (3 ≤ l ≤ m−2), G(2)m (m ≥ 4) is the graph obtained from Cm by adding two edges v1v3 and v2v4. The famous Zarankiewicz’s conjecture on the crossing number of the complete bipartite graph Km,n states that cr(Km,n)=Z(m,n)=[m/2][m-1/2][n/2[n-1/2].Based on Zarankiewicz’s conjecture, a natural problem is to study the change in the crossingnumber of the graphs obtained from the complete bipartite graph by adding certain edge sets.If Zarankiewicz’s conjecture is true, this paper proves that cr(G(1)m+Kn)=Z(m,n)+2[n/2] and cr(G(2)m+Kn)=Z(m,n)+n. 展开更多
关键词 crossing number drawing join graph
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CPU和DRAM加速任务划分方法:大数据处理中Hash Joins的加速实例 认领 引用 被引量：3
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作者 吴林阳 罗蓉 +1 位作者 郭雪婷 郭崎 《计算机研究与发展》 EI CSCD 北大核心 2018年第2期289-304,共16页
硬件加速器能够有效地提高当前计算机系统的能效.然而,传统的硬件加速器(如GPU,FPGA和定制的加速器)和内存是相互分离的,加速器和内存之间的数据移动难以避免,这使得如何降低加速器和内存之间数据移动的开销成为极具挑战性的问题.随着... 硬件加速器能够有效地提高当前计算机系统的能效.然而,传统的硬件加速器(如GPU,FPGA和定制的加速器)和内存是相互分离的,加速器和内存之间的数据移动难以避免,这使得如何降低加速器和内存之间数据移动的开销成为极具挑战性的问题.随着靠近数据的处理技术(near-dataprocessing)和3D堆叠DRAM的出现,我们能够将硬件加速器集成到3D堆叠DRAM中,使得数据移动的开销大大降低.然而,由于3D堆叠DRAM对面积、功耗和散热具有严格的限制,所以不可能将一个功能复杂的硬件加速器完整地集成到DRAM中.因此,在设计内存端的硬件加速器时,应该考虑将加速任务在CPU和加速器之间合理地进行划分.以加速大数据系统中的一个关键操作hash joins为例子,阐述了CPU和内存端加速任务划分的设计思想.以减少数据移动为出发点,设计了一个包含内存端定制加速器和处理器端SIMD加速单元的混合加速系统,并对应用进行分析,将加速任务划分到不同的加速器.其中,内存端的加速器用于加速数据移动受限的执行阶段,而处理器端SIMD加速单元则用于加速数据移动开销较低成本的执行阶段.实验结果表明:与英特尔的Haswell处理器和Xeon Phi相比,设计的混合加速系统的能效分别提升了47.52倍和19.81倍.此外,提出的以数据移动为驱动的方法很容易扩展于指导其他应用的加速设计. 展开更多
关键词 3D堆叠内存 加速器 大数据 hash joins radix joins算法的优化版本 hash分区加速器
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Study of galvanic corrosion and mechanical joint properties of AZ31B and carbon-fiber–reinforced polymer joined by friction self-piercing riveting 认领 引用 被引量：4
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作者 Yong Chae Lim Jiheon Jun +4 位作者 Donovan N.Leonard Yuan Li Jian Chen Michael P.Brady Zhili Feng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第2期434-445,共12页
A new testing methodology was developed to quantitively study galvanic corrosion of AZ31B and thermoset carbon-fiber–reinforced polymer spot-joined by a friction self-piercing riveting process.Pre-defined areas of AZ... A new testing methodology was developed to quantitively study galvanic corrosion of AZ31B and thermoset carbon-fiber–reinforced polymer spot-joined by a friction self-piercing riveting process.Pre-defined areas of AZ31B in the joint were exposed in 0.1 M NaCl solution over time.Massive galvanic corrosion of AZ31B was observed as exposure time increased.The measured volume loss was converted into corrosion current that was at least 48 times greater than the corrosion current of AZ31B without galvanic coupling.Ninety percent of the mechanical joint integrity was retained for corroded F-SPR joints to 200 h and then decreased because of the massive volume loss of AZ31B。 展开更多
关键词 Multi-material joining Carbon fiber–reinforced polymer AZ31B Friction self-piercing riveting Galvanic corrosion Mechanical joint strength
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Refill friction stir spot welding (RFSSW): a review of processing, similar/dissimilar materials joining, mechanical properties and fracture mechanism 认领 引用 被引量：1
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作者 Yun-qiang Zhao Hao-kun Yang +2 位作者 Aloshyn Andriia Hong-hang Lo Jia-xin Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第8期1825-1839,共15页
Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the joint.Having the key-hole free characterization,the similar/... Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the joint.Having the key-hole free characterization,the similar/dissimilar RFSSW joint exhibits remarkable and endurable characteristics,including high shear strength,long fatigue life,and strong corrosion resistance.In the meanwhile,as the key-hole free joint has different microstructures compared with conventional friction stir spot welding,thus the RFSSW joint shall possess different shear and fatigue fracture mechanisms,which needs further investigation.To explore the underlying failure mechanism,the similar/dissimilar metallic material joining parameters and pre-treatment,mechanical properties,as well as fracture mechanisms under this novel technology will be discussed.In details,the welding tool design,welding parameters setting,and the influence of processing on the lap shear and fatigue properties,as well as the corrosion resistance will be mainly discussed.Moreover,the roadmap of RFFSW is also discussed. 展开更多
关键词 Refill friction stir spot welding Processing Mechanism Similar materials joining Dissimilar materials joining Microstructure Mechanical property Fracture mechanism
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Fabrication and Life Prediction of SSiC Ceramic Joint Joined with Silicon Resin YR3370 认领 引用 被引量：2
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作者 YUAN Xiao-kun XU Bing-she 《Chinese Journal of Aeronautics》 SCIE EI CAS 2007年第1期81-85,共5页
Joints between sintered silicon carbide （SSiC） were produced using a polysiloxane silicon resin YR3370 （GE Toshiba Silicones） as joining material. Samples were heat treated in a 99.99% nitrogen flux at temperature... Joints between sintered silicon carbide （SSiC） were produced using a polysiloxane silicon resin YR3370 （GE Toshiba Silicones） as joining material. Samples were heat treated in a 99.99% nitrogen flux at temperatures ranging from 1 100 ℃ to 1 300 ℃. Three point bending strength of the joint reached the maximum of 179 MPa as joined at 1 200℃. The joining layer is continuous, homogeneous and densified and has a thickness of 2 μm -5μm. The joining mechanism is that the amorphous silicon oxycarbide （SixOyCz） ceramic pyrolyzed from silicon resin YR3370 acts as an inorganic adhesive to SSiC substrate, which means the formation of the continuous Si-C bond structure between SixOyCz structure and SSiC substrate. Life prediction of the ceramic joint can be realized through the measurement of the critical time of the joint after the cyclic loading test. 展开更多
关键词 silicon resin YR3370 SiC ceramic ceramic joining joint life
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并行数据库上的并行CMD-Join算法 认领 引用 被引量：5
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作者 李建中 都薇 《软件学报》 EI 北大核心 1998年第4期256-262,共7页
并行数据库在多处理机之间的分布方法（简称数据分布方法）对并行数据操作算法的性能影响很大．如果在设计并行数据操作算法时充分利用数据分布方法的特点，可以得到十分有效的并行算法．本文研究如何充分利用数据分布方法的特点，设计... 并行数据库在多处理机之间的分布方法（简称数据分布方法）对并行数据操作算法的性能影响很大．如果在设计并行数据操作算法时充分利用数据分布方法的特点，可以得到十分有效的并行算法．本文研究如何充分利用数据分布方法的特点，设计并行数据操作算法的问题，提出了基于CMD多维数据分布方法的并行CMD－Join算法．理论分析和实验结果表明。 展开更多
关键词 并行数据库 并行Join算法 CMD-Join算法
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TiC Particle Reinforced Silicon Nitride Composite Joined With Y_2O_3-Al_2O_3-SiO_2 Mixture 认领 引用 被引量：2
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作者 周飞 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第2期13-16,24,共4页
Silicon nitride composite is joined to itself by heating interlayer of Y2 O3 -AL2O3 -SiO2 mixtures above their liquidus temperatures in flowing nitrogen. The joined specimens are tested in four point flexure from room... Silicon nitride composite is joined to itself by heating interlayer of Y2 O3 -AL2O3 -SiO2 mixtures above their liquidus temperatures in flowing nitrogen. The joined specimens are tested in four point flexure from room temperature to 1373 K. The interface microstruclure and fractured surfaces after testing are observed and analyzed by SEM, EPMA and XRD respectively. The results show that F2 O3 -A12 O3 -SiO2 glass reacts with Si3 N4 at interface, forming the Si3 N4/Si2 N2 O( Y-AlrSi-O-N glass/ Y-Al- Si-O glass gradient interface. With the increase of bonding temperature and holding time, the joint strength first increases, reaching a peak, and then decreases . According to interfacial analyses , the bonding strength depends on joint thickness . 展开更多
关键词 silicon nitride composite joining interface reaction joint strength
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Mechanical behaviour of adhesively single lap joint under buckling conditions 认领 引用 被引量：1
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作者 Ferhat KADIOGLU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第2期154-164,共11页
Adhesive Single Lap Joints have been subjected to tensile and bending investigations by many researchers. However, the joint is also likely to experience buckling loading in some aerospace applications. The aim of thi... Adhesive Single Lap Joints have been subjected to tensile and bending investigations by many researchers. However, the joint is also likely to experience buckling loading in some aerospace applications. The aim of this work is to investigate the joint behaviour under quasi-static buckling conditions. For this purpose, the joints with three different adherend thicknesses and 25 mm overlap length were tested using two different types of adherends and an adhesive film. They were modelled using a non-linear Finite Element Method via the ABAQUS Explicit package programme.Load to failure and stress distributions in the joints were predicted and compared with the experimental results, which were found in a good agreement. The adhesive layer in the joint was assumed to experience shear stresses under the buckling mode, similar to that in tensile loading, yet, the stress concentrations at the ends of the overlap, the main cause of the failure, resulted in different effects on the joint performance;for the buckling mode the critical stresses were in compression but for the tensile case in peeling. Unlike the latter, the former was found to prevent failure of the layer depending on the adherend thickness, causing different failure mechanisms. There were two different failure modes of the joints;a complete failure in the adhesive layer and large plastic deformation of adherends which could be a good source for crashworthiness situations. Mechanical properties of the adherends were found to play important roles on the joint performance. 展开更多
关键词 Adhesive joins Buckling mode Energy absorption Finite element method Single lap joint
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并行JOIN算法的优化子集合调整方法 认领 引用
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作者 孙文隽 李建中 李金宝 《黑龙江大学自然科学学报》 CAS 1997年第3期39-46,54,共8页
子集合调整是克服数据偏斜影响的并行HASH－JOIN算法的关键组成部分，现有的克服数据偏斜影响的HASH－JOIN算法都没有很好地解决这个问题。作者深入地研究了子集合调整问题，提出了四种子集合调整算法。理论分析和实验结果都证明，这四... 子集合调整是克服数据偏斜影响的并行HASH－JOIN算法的关键组成部分，现有的克服数据偏斜影响的HASH－JOIN算法都没有很好地解决这个问题。作者深入地研究了子集合调整问题，提出了四种子集合调整算法。理论分析和实验结果都证明，这四种算法都能够很好地解决子集合调整问题，特别是启发式优化算法OP－ADJUST在多数情况下都能给出优化解。 展开更多
关键词 数据库 子集合调整 JOIN操作 并行JOIN算法
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