检索结果-内蒙古大学图书馆

Ballistic response of skin simulant against fragment simulating projectiles

Defence technology（防务技术） 2023年第12期30卷 70-82页

作者： Punit Kumar Pandey Atul Harmukh M.K.Khan M.A.Iqbal S.G.Ganpule Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee247667India Department of Civil Engineering Indian Institute of Technology Roorkee247667India Department of Design Indian Institute of Technology Roorkee247667India

The response of biological phantoms against high velocity impact is actively sought for applications in defense,space,soft robotics and *** this end,we study the ballistic response of silicone based skin simulant against fragment *** a pneumatic gas gun setup,six chisel-nosed and three regular shaped(sphere,cylinder,and cube)fragments were impacted on the skin *** resulting skin simulant response was studied in terms of ballistic limit velocities,energy densities,failure pattern,and the mechanics of *** results indicate that the shape of the fragment affects the ballistic limit *** ballistic limit velocities,energy densities of the chisel-nosed fragment simulating projectiles were relatively insensitive to the size(mass),except for the smallest(0.16 g)and largest(2.79 g)chisel-nosed *** the same size(1 g),ballistic limit velocities and failure are dependent on the shape of the *** skin simulant failed by combined plugging and elastic hole *** in the spherical fragment was dominated by the elastic hole enlargement,whereas plugging failure was dominant in all other *** spherical,cylindrical,and chisel-nosed fragments created circular cavities,and the cubical fragment created a square *** the case of the spherical fragment,slipping of the fragment within the skin simulant was *** fragments created lateral cracks emanating from the corners of the square ***,for all the fragments,the maximum deformation corresponding to the perforation was lower than the non-perforation indicating rate dependent,stress driven *** maximum deformation was also dependent on the shape of the ***,these results provide unique insights into the mechanical response of a soft simulant against ballistic *** have utility in the calibration and validation of computational models,design of personal protective equipment,and antipersonnel syste

关键词： Skin simulant Fragment Impact Ballistic limit velocity Energy density Failure

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Thin-wall Structures and Inconel 718 Characteristics with Pulse Wave Mode in L-PBF

引用

Transactions of the Korean institute of Electrical Engineers 2024年第5期73卷 871-878页

作者： Bae, Jeong-Hyeon Lee, Jae-Hyang Kim, Do-Hyun Kang, Dong-Seok Son, Yong Yeon, Si-Mo Research Institute of Intelligent Manufacturing & Materials Technology Korea Institute of Industrial Technology Korea Republic of Dept. of Mechanical Design Engineering Hanyang University Korea Republic of

Recent advances in additive manufacturing technology have made it possible to produce components with complex geometric structures using the Laser Powder Bed Fusion(L-PBF) process. However, there are still limitations when manufacturing extreme geometric shapes, such as thin wall. The thin walls are vulnerable to thermal deformation due to local heat accumulation in L-PBF. In this study, we applied a pulse mode with low thermal effect to manufacture ultra thin-wall structures using Inconel 718 in L-PBF and manufacturing characteristics were compared with the continuous wave emission mode. Then the process and mechanical properties of the pulse mode were analyzed through unit specimens and tensile specimens. Copyright © The Korean institute of Electrical Engineers.

关键词： 3D printing

来源：评论

学校读者我要写书评

暂无评论

Optimization of L-PBF Laser Scan Path Compensation design for Mitigation Heat Accumulation in Overhang Structure Without Support Structure

引用

Transactions of the Korean institute of Electrical Engineers 2024年第5期73卷 879-884页

作者： Kim, Do-Hyun Lee, Jae-Hyang Bae, Jeong-Hyeon Hong, Suk-Joon Yeon, Si-Mo Kang, Dong-Seok Son, Yong Research Institute of Intelligent Manufacturing & Materials Technology Korea Institute of Industrial Technology Korea Republic of Dept. of Mechanical Design Engineering Hanyang University Korea Republic of

This study aims to achieve uniformity in heat history by mitigating heat gradients during the production of overhang structures using the metal powder melting process. Specimens with a 30-degree overhang angle were created, and monitoring of thermal radiation intensity during the process confirmed heat accumulation in the specimens. The optimized laser scan path compensation design resulted in a 5.98% reduction in the coefficient of variation of thermal radiation intensity, and X-Ray CT imaging revealed an 80.47% reduction in deformation. With the optimized laser scan path compensation design developed in this study, it is anticipated that the metal powder melting method for manufacturing aerospace components with complex shapes, including overhang structures, will yield a reduction in deformation due to alleviated heat accumulation. Copyright © The Korean institute of Electrical Engineers.

关键词： Powder metals

来源：评论

学校读者我要写书评

暂无评论

Measurement of Brain Strains in a Goat Head Under Impact Loading

引用

Journal of engineering and Science in Medical Diagnostics and Therapy 2024年第1期7卷 014501页

作者： Singh, Abhilash Naing, Yan Ganpule, S.G. Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee247667 India Department of Design Indian Institute of Technology Roorkee247667 India

Measurements of brain deformations under dynamic loading are required to understand the biomechanics of traumatic brain injury (TBI). In this work, we have experimentally measured two-dimensional (2D) brain deformations in a sacrificed goat brain under injurious impact loading. To facilitate imaging, the goat head was dissected along the longitudinal midline. Goat head response was studied for sagittal plane rotation. Full-field, 2D deformations in the midsagittal plane of a goat brain were obtained at spatiotemporal resolutions of ~1 mm and 0.4 ms, respectively. Results elucidate the dynamic strain evolution. The goat brain underwent large deformation. The strain pattern was heterogeneous. Peak strains in various brain regions were established within ~20 ms, followed by negligible strain development due to the considerable viscous dissipation. The Cerebellum region experienced the highest strain, followed by cortical and subcortical regions. Strain concentration in the goat brain near the stiff membrane of the tentorium was observed. The strains in a brain simulant of a head surrogate (obtained previously) were also compared against the goat brain response. A response in the brain simulant was comparable to the goat brain in terms of strain pattern, peak strains in various substructures, and strain concentration near the membrane. However, the brain simulant was less dissipative than the goat brain. These results enhance the current understanding of the biomechanics of the brain under dynamic loading. Copyright © 2024 by ASME.

关键词： Brain

来源：评论

学校读者我要写书评

暂无评论

Long-Lasting Filtration of Oily Water by Anti-Fouling Underwater Oleophobic Sand Particles

引用

Journal of Bionic engineering 2024年第2期21卷 913-923页

作者： Xingyu Liu Junxu Chen Rui Wang Yifan Su Zhangheng Zhou Zezhong Hou Zhuoran Li Junhao Zhao Weicai Shi Xinquan Yu Zhaopeng Yu Youfa Zhang State Key Laboratory of Advanced Technology for Float Glass CNBM Research Institute for Advanced Glass Materials Group Co.LtdBengbu233000China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing211189China Research Institute of Petroleum Engineering Technology of Jiangsu Oilfield Yangzhou225009China Kunshan Industrial Technology Research Institute Kunshan215300SuzhouChina School of Automotive Engineering Changshu Institute of TechnologyChangshu215500SuzhouChina

The produced water from the oilfield was purified with filter material and then injected back into the *** serpentine filter material was easy to harden with the increase in filtration amount,which affected the water quality.A superhydrophilic/underwater oleophobic serpentine filter material was successfully prepared by a simple method of coating modification,which exhibited long-lasting filtration of oily water,good filtration and anti-fouling properties,and resistance to *** film-forming material of the superhydrophilic/underwater oleophobic coating was composed of SiO_(2) particles with small size,which could completely and evenly cover the filter *** weight loss was only 7.6%after mechanical stirring for 90 *** with the original filter material,the superhydrophilic/underwater oleophobic serpentine filter material showed a better anti-fouling ability and resistance to *** filtration of crude oil emulsion and oil slick sewage showed a better backwashing *** 35 cycles of continuous filtration of suspended solids in wastewater,the backwashing rate reached 78.4%.The results provided an effective method for the filtration of oily wastewater in the oilfield.

关键词： Serpentine Underwater oleophobic Water immersion resistance Anti-fouling Hardening resistance

来源：评论

学校读者我要写书评

暂无评论

Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

引用

Journal of Materials Science & technology 2024年第5期172卷 71-82页

作者： Xiang Su Yuan Lei Yang Chen Hongjie Qu Zhixiang Qi Gong Zheng Xu Liu Henggao Xiang Guang Chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦C increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)Cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： Aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

来源：评论

学校读者我要写书评

暂无评论

Machine-learned wearable sensors for real-time hand-motion recognition: toward practical applications

引用

National Science Review 2024年第2期11卷 231-263页

作者： Kyung Rok Pyun Kangkyu Kwon Myung Jin Yoo Kyun Kyu Kim Dohyeon Gong Woon-Hong Yeo Seungyong Han Seung Hwan Ko Department of Mechanical Engineering Seoul National University IEN Center for Human-Centric Interfaces and Engineering Institute for Electronics and NanotechnologyGeorgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Department of Chemical Engineering Stanford University Department of Mechanical Engineering Ajou University George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National University

Soft electromechanical sensors have led to a new paradigm of electronic devices for novel motion-based wearable applications in our daily lives. However, the vast amount of random and unidentified signals generated by complex body motions has hindered the precise recognition and practical application of this technology. Recent advancements in artificial-intelligence technology have enabled significant strides in extracting features from massive and intricate data sets, thereby presenting a breakthrough in utilizing wearable sensors for practical applications. Beyond traditional machine-learning techniques for classifying simple gestures, advanced machine-learning algorithms have been developed to handle more complex and nuanced motion-based tasks with restricted training data sets. Machine-learning techniques have improved the ability to perceive, and thus machine-learned wearable soft sensors have enabled accurate and rapid human-gesture recognition, providing real-time feedback to users. This forms a crucial component of future wearable electronics, contributing to a robust human–machine interface. In this review, we provide a comprehensive summary covering materials, structures and machine-learning algorithms for hand-gesture recognition and possible practical applications through machine-learned wearable electromechanical sensors.

关键词： wearable sensor soft electronics artificial intelligence machine learning human–machine interfaces gesture recognition

来源：评论

学校读者我要写书评

暂无评论

A STUDY ON BUCKLING STRENGTH OF REINFORCED ANGLE STEEL POST IN TRANSMISSION TOWERS

Journal of Structural and Construction Engineering

引用

Journal of Structural and Construction engineering 2023年第807期88卷 835-843页

作者： Takagi, Shunichi Sato, Atsushi Kodani, Takahiro TOMOE Corporation Japan Graduate School of Engineering Nagoya Institute of Technology Japan Dept. Architecture Design Civil Engineering and Industrial Management Engineering Nagoya Institute of Technology Japan

It has become a very important issue to establish a rational reinforcement method for transmission towers, since the increase of assumed loads resulting from revision of design standards. However, some methods have been established for replacing and reinforcing brace members, it's very difficult to replace the main post members. In this study, we propose a reinforcement method in which reinforcement members are added to the existing main post angle members, and confirm the effectiveness of the reinforcement and its range of application by member compression tests. © 2023 Architectural institute of Japan. All rights reserved.

关键词： Reinforcement

来源：评论

学校读者我要写书评

暂无评论

Fabrication of dense SiBCN monolith at a lower temperature and its high-temperature performance

引用

Journal of advanced Ceramics 2024年第8期13卷 1198-1211页

作者： Zi-Bo Niu Daxin Li Dechang Jia Zhihua Yang Kunpeng Lin Yan Wang Paolo Colombo Ralf Riedel Yu Zhou Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structural-Function Integrated Materials and Green Manufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China Department of Industrial Engineering University of PadovaPadova 3513iItaly Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity Park 16802USA Institute of Materials Science Darmstadt University of TechnologyDarmstadt 64287Germany School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

In this study,a crack-free pyrolysis process of partially cured precursor powder compacts was developed to prepare dense silicon boron carbonitride(SiBCN)monoliths at much lower temperatures(1300℃),thereby circumventing the challenges of sintering densification(>1800℃).Unlike the elastic fracture in over-cured precursors or the viscoelastic deformation in under-cured precursors,the partially cured precursor,exhibiting elastic-plastic deformation behavior,facilitates limited nanoscale pore formation in a dense structure,achieving a balance between crack-free pyrolysis and *** to SiBCN derived from the over-cured precursor(σ=~159 MPa,K_(IC)=1.9 MPa:m^(1/2),Vickers hardness(HV)=7.8 GPa,and E=122 GPa),the resulting SiBCN monolith exhibited significantly improved mechanical properties(σ=~304 MPa,K_(IC)=3.7 MPa-m12,HV=10.6 GPa,and E=161 GPa)and oxidation *** addition,this study investigated the high-temperature performance of SiBCN monoliths,including crystallization and oxidation,and determined the oxidation kinetics induced by pore structure healing and the different oxidation mechanisms of Si-C-N and B-C-N clusters in the amorphous *** to its unique composition and structure,the SiBCN ceramic oxide layer exhibits exceptional self-healing effects on repairing the nanoporous system in the initial stage and shows outstanding high-temperature stability during prolonged oxidation,mitigating adverse effects from bubble formation and *** to the nanoporous structure,the oxidation rate is initially controlled by gas diffusion following a linear law before transitioning to oxide layer diffusion characterized by a parabolic ***,due to different valence bond configurations,Si-C-N transforms into an amorphous SiCNO structure after phase separation,unlike the nucleation and growth of residual B-N-C.

关键词： silicon boron carbonitride(SiBCN)ceramics crack-free pyrolysis amorphous structure oxidation mechanisms kinetic law

来源：评论

学校读者我要写书评

暂无评论

Enhanced reactive oxygen species generation:Synergic process of three-electron oxygen reduction and electrochemical ozone production by bimetallic La-Nb oxides

引用

Journal of Energy Chemistry 2025年第5期104卷 155-165页

作者： Xiaoge Peng Xu Liu Xiaosa Wang Yuanan Li Suiqin Li Yuhang Wang Zhikang Bao Haoqiang Cao Yunyi Cao Xing Zhong Jianguo Wang Institute of Industrial Catalysis State Key Laboratory Breeding Base of Green-Chemical Synthesis TechnologyZhejiang University of TechnologyHangzhou 310032ZhejiangChina Innovation Research Center for Advanced Environmental Technology Eco-Industrial Innovation InstituteZJUTQuzhou 324400ZhejiangChina Advanced Technology Center Wuxi Little Swan Electric Co.LtdWuxi 214125JiangsuChina College of Chemical and Material Engineering Quzhou UniversityQuzhou 324000ZhejiangChina

The anodic electrochemical ozone production(EOP)and the cathodic three-electron oxygen reduction reaction(3e^(-)ORR)are effective processes for generating active oxygen species(ROS).However,the activation of ozone(O_(3))by hydroxyl radical(OH)to form ROS poses significant *** micelle balllike bimetallic La-Nb oxides(LNOx)have been developed as a bifunctional electrocatalyst for both the EOP and 3e^(-)ORR *** LNO20 demonstrated a 9.8%of Faradaic efficiency(FE)in O_(3)production and a transfer number of 2.8 electrons in the 3e^(-)*** calculations support the notion that the five-membered ring mechanism in LNO20 facilitates O_(3)***,the incorporation of La provides active sites that enhance the activation of hydrogen peroxide(^(*)H_(2)O_(2))and the generation of *** innovative approach synergistically integrates EOP and 3e^(-)ORR,enhancing the activation of O_(3)to produce ROS,demonstrating exceptional efficacy in the degradation of organic pollutants and antimicrobial *** study paves the way for designing advanced electrocatalysts for EOP and 3e^(-)ORR and offers insights into utilizing electrochemical method to support other antibacterial strategies.

关键词： Three electron oxygen reduction reaction Electrochemical ozone production Synergistic electrosynthesis Reactive oxygen species Antibacterial

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：