检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 293-307页

作者： hong-Jiang Wan Xiao-Qi Wu hong-liang Ming Jian-Qiu Wang En-hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangzhou510530China

The effects of hydrogen charging time and pressure on the hydrogen embrittlement(HE)susceptibility of X52 pipeline steel material are studied by slow strain rate tensile *** fracture morphologies of the specimens are observed by scanning electron *** HE susceptibility of the X52 pipeline steel material increases with an increase in both hydrogen charging time and hydrogen *** a charging time of 96 h,the HE susceptibility index reaches 45.86%,approximately 3.6 times that at a charging time of 0 ***,a charging pressure of 4 MPa results in a HE susceptibility index of 31.61%,approximately 2.5 times higher than that at a charging pressure of 0.3 MPa.

关键词： Hydrogen embrittlement X52 pipeline steel material Tubular specimen Hydrogen charging time Hydrogen charging pressure

Fracture behavior of a composite composed by Ti-aluminide multi-layered and continuous-SiC_f-reinforced Ti-matrix

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2017年第12期36卷 925-933页

作者： Kai Zhu Yan-Jin Xu Tao Jing hong-liang hou School of Materials Science and Engineering Tsinghua University Beijing 100084 China Metal Forming Technology Department Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024China

In the present work, a novel hybrid composite composed of Ti-aluminide multi-layered part and continuous-SiCf-reinforced Ti-matrix part using a vacuum hot pressing/hot isostatic pressure(VHP/HIP) sintering process was synthesized. Then,the damage tolerance behavior of this hybrid composite was studied by tensile tests and in situ scanning electron microscopy(SEM) three-point bending tests. The results indicate that the mechanical properties and crack propagation of the hybrid composite are strongly influenced by the extrinsic toughness mechanism. In detail, the crack deflection of multi-layered composite and strengthening effect of SiCf-reinforced matrix composite are observed in the hybrid *** to the strengthening effect of continuous-SiCf-reinforced Ti-matrix part, the tensile strength of hybrid composite is much higher than that of neat Ti-aluminide multi-layered composite. Furthermore, it is found that the optimal damage tolerance ability is optimized when the notch position is located at the Ti-aluminide multi-layered part due to the crack deflection of multi-layered structure.

关键词： Hybrid composite Synthesis Mechanical properties In situ observation

Interface microstructure and bond strength of 1420/7B04 composite sheets prepared by diffusion bonding

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第7期37卷 613-620页

作者： Fan Wu Wen-Long Zhou Bing Zhao hong-liang hou School of Materials Science and Engineering Dalian University of Technology Dalian 116023 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100023 China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Scienceand Engineering Dalian University of Technology Dalian 116085 China

The effect of temperature on interface microstructure and shear strength of 1420 A1-Li alloy and 7B04 A1 alloy composite plates prepared by diffusion bonding were investigated. The results indicate the optimum temperature for bonding the composite plates is 520℃, a sound bonding interface without continuous intermetallic compound layers and interfacial voids is obtained, and the shear strength value of bond joints can be as high as 190 MPa. An interfacial transition zone is formed due to the alloying elements mutual diffusion during the bonding process. Meanwhile, the effect of temperature on diffusion of alloying elements and interface reaction were discussed in detail, the results show that the higher temperature can increase the diffusion of alloying elements fluxes across the bonding interface, which can accelerate the closure of interfacial voids; meanwhile, when Mg atoms diffuse across the bonding interface, it can react with and break up the surface oxide films into discrete particles, and the removal of interface oxides increases the metal to metal bond areas and improves the bond quality.

关键词： Diffusion bonding Alloying elementsdiffusion Interface microstructure Shear strength

Optimization on crystallization process of the magnetic core lysozyme

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第4期87卷 106-113页

作者： Lixia hou Chunxiao Qu Min Su Zhihan liang Qi Hao School of Chemical Engineering Hebei University of TechnologyTianjin300130China

The continuous growth of the biomedical market highlights the significance of improvement in the ef-ficiency of batch production for protein drug ***,we investigated the effect of polymer-modified Fe_(3)O_(4) nanoparticles on lysozyme(Lys)crystallization at different conditions,using function-alized Fe_(3)O_(4) magnetic nanoparticles(Polymer C@Fe_(3)O_(4))as nucleation *** study revealed that the surface charge density of Polymer C@Fe_(3)O_(4) was highest at a modification mass ratio of Fe_(3)O_(4) to Polymer C is 8∶*** ratio facilitates the augmentation of electrostatic interaction and the promotion of *** adding 15%of the PolymerC@Fe_(3)O_(4) prepared from Fe_(3)O_(4) with an average particle size of 150 nm,the magnetic core lysozyme(M-Lys)crystals with an average particle size of 11.08μm,narrow size distribution,and regular morphology were obtained in a yield of 82.42%within 60 min.

关键词： Protein Crystallization Magnetic particle Lysozyme

Heat Transfer Characteristics of a Microchannel Heat Sink with Highly-Dense Micro-Jet Arrays

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第3期33卷 1148-1160页

作者： ZHANG Yu CHEN Xiaoyan MIAO Lin CHEN liang hou Yu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Beijing Aerospace Technology Institute Beijing100083China

This paper proposed a new structure of highly-dense micro-jet arrays for hybrid jet-impingement/microchannel heat sinks(~120 jet per cm^(2) with jet width of 0.35 mm).Parametric study is performed to investigate the influence of structure and flow parameters on the convective heat transfer of water jet cooling in confined *** simulation results show that the optimal jet width,jet spacing and impingement distance are around 0.2 mm,0.2 mm and 0.3 mm,respectively,which can achieve a low thermal resistance as well as a relatively low pressure *** analysis of the heat transfer pathways shows that the micro-fin jet structures can extend the impinging heat transfer area and conduct a considerable proportion of heat,which can reach up to 38.9%with the Reynolds number ranging from 797.1 to *** heat transfer characteristics in the heat sink will shift from impingement dominated heat transfer to the channel-convection dominated heat transfer as the jet impingement distance increases.A correlation is proposed to predict the average Nusselt number on the stagnation area for the heat sink with different structure parameters,and the deviations of predictions from the numerical results are less than 10%.

关键词： hybrid heat sink impingement microchannel thermal management high heat flux

Thermodynamic Calculation on the Formation of Titanium Hydride

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第6期21卷 569-574页

作者： Jing-wei Zhaoa Hua Ding Xue-feng Tian Wen-juan Zhao hong-liang hou School of Materials and Metallurgy Northeastern University Shenyang 110004 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China

用在元素 Ti 和 H 的基本性质之中的相互关系，一个修改 Miedema 模特儿被雇用计算钛氢化物 TiH x (1 ≤x ≤2 ) 。把稳固的热能力，震动的熵，以及电子的熵的理论基于 Debye，被量力学获得，统计热力学方法，和一条新途径被介绍计算 T... 详细信息

用在元素 Ti 和 H 的基本性质之中的相互关系，一个修改 Miedema 模特儿被雇用计算钛氢化物 TiH x (1 ≤x ≤2 ) 。把稳固的热能力，震动的熵，以及电子的熵的理论基于 Debye，被量力学获得，统计热力学方法，和一条新途径被介绍计算 TiH 2 的形成的标准熵。TiH x 随 x 的增加线性地减少。分别地，在 298.16 K 的 TiH 2 的形成的标准热含量，熵，和免费精力的计算结果是 −142.39 kJ/mol， −143.0 J/( 摩尔· K ) 和 −99.75 kJ/mol 它与以前报导的数据由试验性或理论的计算方法获得了一致。结果证明为钛氢化物的热力学的模型是讲理的。

关键词：热力学计算方法钛氢化物化学结构

Resource Allocation for Space-Air-Ground Integrated Networks:A Comprehensive Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Communications and Information Networks 2024年第1期9卷 1-23页

作者： Hui liang Zhiqing Yang Guobin Zhang Hanxu hou School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Peng Cheng Laboratory Shenzhen 518055China School of Electronics and Information Engineering Shenzhen UniversityShenzhen 518061China School of Electrical Engineering and Intelligentization Dongguan University of TechonologyDongguan 523808China School of Information and Communication Engineering Guangzhou Maritime UniversityGuangzhou 510725China

The space-air-ground integrated networks (SAGIN) has emerged as a critical paradigm to address the growing demands for global connectivity and enhanced communication services. This paper gives a thorough review of the strategies and methodologies for resource allocation within SAGIN, focusing on the challenges and solutions within its complex structure. With the advent of technologies such as 6G, the dynamics of resource optimization have become increasingly complex, necessitating innovative approaches for efficient management. We examine the application of mathematical optimization, game theory, artificial intelligence (AI), and dynamic optimization techniques in SAGIN,offering insights into their effectiveness in ensuring optimal resource distribution, minimizing delays, and maximizing network throughput and stability. The survey highlights the significant advances in AI-based methods,particularly deep learning and reinforcement learning, in tackling the inherent challenges of SAGIN resource allocation. Through a critical review of existing literature, this paper categorizes various resource allocation strategies, identifies current research gaps, and discusses potential future directions. Our findings highlight the crucial role of integrated and intelligent resource allocation mechanisms in realizing the full potential of SAGIN for next-generation communication networks.

关键词： space-air-ground integrated networks resource allocation 6G optimization theory game theory artificial intelligence

Constrained clustering with weak label prior

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 117-132页

作者： Jing ZHANG Ruidong FAN hong TAO Jiacheng JIANG Chenping hou College of Sciences National University of Defense TechnologyChangsha 410073China

Clustering is widely exploited in data *** has been proved that embedding weak label prior into clustering is effective to promote its *** researches mainly focus on only one type of ***,in many real scenarios,two kinds of weak label prior information,e.g.,pairwise constraints and cluster ratio,are easily obtained or already *** to incorporate them to improve clustering performance is important but rarely *** propose a novel constrained Clustering with Weak Label Prior method(CWLP),which is an integrated *** the unified spectral clustering model,the pairwise constraints are employed as a regularizer in spectral embedding and label proportion is added as a constraint in spectral *** approximate a variant of the embedding matrix more precisely,we replace a cluster indicator matrix with its scaled *** of fixing an initial similarity matrix,we propose a new similarity matrix that is more suitable for deriving clustering *** for the theoretical convergence and computational complexity analyses,we validate the effectiveness of CWLP through several benchmark datasets,together with its ability to discriminate suspected breast cancer patients from healthy *** experimental evaluation illustrates the superiority of our proposed approach.

关键词： clustering weak label prior cluster ratio pairwise constraints

Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 945-952页

作者： Bao-Shuai Han Yan-Jin Xu En-Yu Guo Tao Jing hong-liang hou liang-Shun Luo AVIC Manufacturing Technology Institute BeijingBeijing 100024China School of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China School of Materials Science and Engineering DalianUniversity of TechnologyDalian 116024China School of Materials Science and Engineering TsinghuaUniversityBeijing 100084China

A turtle carapace bio-inspired Ti matrix hybrid composite was successfully fabricated in this work. This composite incorporates two parts： the Ti-Al intermetallic multilayered composite and continuous SiC fibers-reinforced Ti matrix composite. In the Ti-Al intermetallic multilayered composite part, a series of Ti-Al intermetallics compounds, including Ti3Al, TiAl, TiAl2 and TiAl3, were formed between the Ti layers. In the continuous SiC fibers-reinforced Ti matrix composite part, SiC fibers and Ti matrix were found to be bonded well through weak interface reaction. Flexural strength of this material reached 1.21 ±0.16 GPa, measured by three-point bending test. The deformation features suggest that the hierarchical structure combining ductile Ti layers/matrix with brittle high-strength Ti-Al intermetallics layers/SiC fibers can effectively enhance the mechanical properties of the bio-inspired hybrid composite.

关键词： Bio-inspired composite Hierarchical structure Cracks propagation Flexural property

Dynamic ocean inverse modeling based on differentiable rendering

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第2期10卷 279-294页

作者： Xueguang Xie Yang Gao Fei hou Aimin Hao hong Qin State Key Lab of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Qingdao Research Institute Beihang UniversityQingdao 266100Chinaand Peng Cheng LabShenzhen 518000China SKLCS Institute of SoftwareChinese Academy of SciencesBeijing 100190Chinaand University of Chinese Academy of SciencesBeijing 100049China Department of Computer Science Stony Brook University(SUNY at Stony Brook)Stony BrookNew York 11794-2424USA

Learning and inferring underlying motion patterns of captured 2D scenes and then re-creating dynamic evolution consistent with the real-world natural phenomena have high appeal for graphics and *** bridge the technical gap between virtual and real environments,we focus on the inverse modeling and reconstruction of visually consistent and property-verifiable oceans,taking advantage of deep learning and differentiable physics to learn geometry and constitute waves in a self-supervised ***,we infer hierarchical geometry using two networks,which are optimized via the differentiable *** extract wave components from the sequence of inferred geometry through a network equipped with a differentiable ocean ***,ocean dynamics can be evolved using the reconstructed wave *** extensive experiments,we verify that our new method yields satisfactory results for both geometry reconstruction and wave ***,the new framework has the inverse modeling potential to facilitate a host of graphics applications,such as the rapid production of physically accurate scene animation and editing guided by real ocean scenes.

关键词： inverse modeling surface reconstruction wave modeling ocean waves differentiable rendering(DR)