检索结果-内蒙古大学图书馆

Toward Safe and Efficient Human-Robot Interaction via Behavior-Driven Danger Signaling

IEEE Transactions on Control Systems Technology 2024年第1期32卷 214-224页

作者： Hosseinzadeh, Mehdi Sinopoli, Bruno Bobick, Aaron F. Washington State University School of Mechanical and Materials Engineering PullmanWA99164 United States Washington University in St. Louis Department of Electrical and Systems Engineering St. LouisMO63130 United States Washington University in St. Louis Department of Computer Science and Engineering St. LouisMO63130 United States

This article introduces the notion of danger awareness in the context of human-robot interaction, which decodes whether a human is aware of the existence of the robot, and illuminates whether the human is willing to engage in ensuring safety. This article also quantifies the notion as a single binary variable, called danger awareness coefficient, and provides a game-theoretic interpretation for that. Employing an online Bayesian learning method to update the robot's belief about the human's danger awareness by observing their actions, it is shown how the robot can build a predictive human model to anticipate the human's future actions. To enrich robot's observations, and thus to improve safety and efficiency of the robot, the robot is equipped with a danger signaling system to generate awareness in the human. Finally, a planning scheme is proposed to provide an efficient and probabilistically safe plan for the robot. The effectiveness of the proposed scheme is demonstrated through simulation studies on an interaction between a self-driven car and a pedestrian. © 1993-2012 IEEE.

关键词： Human robot interaction

来源：评论

学校读者我要写书评

暂无评论

Beads-on-string hierarchical structured electrocatalysts for efficient oxygen reduction reaction

引用

Carbon Energy 2023年第2期5卷 225-235页

作者： Yang Yuan Qing Zhang Yinling Li Luyao Lv Yan Hou Ge Li Jing Fu Lin Yang Zhengyu Bai Collaborative Innovation Center of Henan Province for GreenManufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiangHenanPeople's Republic of China Department of Mechanical Engineering University of AlbertaEdmontonAlbertaCanada Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghaiPeople's Republic of China

Rational design of hierarchically structured electrocatalysts is particularly important for electrocatalytic oxygen reduction reaction(ORR).Here,ZIF-67 crystals are stringed on core-shell Ag@C nanocables using a coordinationmodulated *** pyrolysis,Ag@C strings of Co nanoparticles embedded with three-dimensional porous carbon with beads-on-string hierarchical structures are *** to the advantages of the rich electrochemical active sites of Co-based“beads”and the efficient electron transfer pathways via Ag@C“strings,”the resultant NH_(3)-Ag@C@Co-N-C-700 catalyst shows an improved electrocatalytic activity toward ***_(3)-Ag@C@Co-N-C-700 shows a high onset potential of 0.99 V versus RHE,a high half-wave potential of 0.88 V versus RHE,and a large limiting current of 5.8 mA cm^(-2),which are better than those of commercial Pt/C ***,the NH_(3)-Ag@C@Co-N-C-700 catalyst shows high stability and preeminent methanol tolerance,which makes NH_(3)-Ag@C@Co-N-C-700 a promising catalyst for oxygen electrocatalysis in fuel cell applications.

关键词： beads-on-string structure electrocatalyst metal-organic framework oxygen reduction reaction

来源：评论

学校读者我要写书评

暂无评论

Low-Temperature Methanolysis of Polycarbonate over Solid Base Sodium Aluminate

引用

Langmuir 2024年第10期40卷 5338-5347页

作者： Krisbiantoro, Philip Anggo Sato, Miyu Lin, Tzu-Ming Chang, Yu-Chia Peng, Tzu-Yun Wu, Yun-Chih Liao, Weisheng Kamiya, Yuichi Otomo, Ryoichi Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering College of Engineering National Taiwan University Taipei10617 Taiwan Graduate School of Environmental Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Faculty of Environmental Earth Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan320 Taiwan

Herein, a low-cost and readily available sodium aluminate (NaAlO2) was used as a solid base catalyst for the depolymerization of polycarbonate (PC) via methanolysis in the presence of tetrahydrofuran (THF) as a solvent. NaAlO2 was highly active for the reaction, and the performance was comparable to that of soluble strong base SrO and much higher than those of MgO and CaO. By the reaction over the catalyst, a highly pure and crystalline bisphenol A (BPA) was obtained. Among tested organic solvents, THF was the best in aiding PC methanolysis over NaAlO2 due to the polarity similar to PC according to Hansen solubility parameters (HSPs). At 60 °C, 98.1% PC conversion and 96.8% BPA yield were achieved within just 2 h. NaAlO2 was reusable without any severe catalyst deactivation in at least four runs. The mechanistic study revealed that the reaction proceeded via the methoxide pathway, with THF aiding the dissolution of PC. The reaction over NaAlO2 possessed a low apparent activation energy (Ea) of 75.1 kJ mol-1, which is the lowest ever reported so far for the reaction over solid catalysts. © 2024 The Authors. Published by American Chemical Society.

关键词： Sodium Aluminate

来源：评论

学校读者我要写书评

暂无评论

A soft, self-sensing tensile valve for perceptive soft robots (vol 14 ,3942 ,2023)

引用

NATURE COMMUNICATIONS 2023年第1期14卷 1-10页

作者： Choe, Jun Kyu Kim, Junsoo Song, Hyeonseo Bae, Joonbum Kim, Jiyun Department of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Department of Mechanical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Center for Multidimensional Programmable Matter Ulsan National Institute of Science and Technology Ulsan 44919 South Korea

Soft inflatable robots are a promising paradigm for applications that benefit from their inherent safety and adaptability. However, for perception, complex connections of rigid electronics both in hardware and software remain the mainstay. Although recent efforts have created soft analogs of individual rigid components, the integration of sensing and control systems is challenging to achieve without compromising the complete softness, form factor, or capabilities. Here, we report a soft self-sensing tensile valve that integrates the functional capabilities of sensors and control valves to directly transform applied tensile strain into distinctive steady-state output pressure states using only a single, constant pressure source. By harnessing a unique mechanism, “helical pinching”, we derive physical sharing of both sensing and control valve structures, achieving all-in-one integration in a compact form factor. We demonstrate programmability and applicability of our platform, illustrating a pathway towards fully soft, electronics-free, untethered, and autonomous robotic systems.

关键词： mechanical engineering Polymers

来源：评论

学校读者我要写书评

暂无评论

Harvesting Energy Via Water Movement and Surface Ionics in Microfibrous Ceramic Wools

引用

Energy & Environmental materials 2024年第6期7卷 332-341页

作者： Manpreet Kaur Avinash Alagumalai Omid Mahian Sameh M.Osman Tadaaki Nagao Zhonglin Wang Research Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukuba 305-0044IbarakiJapan Department of Chemical and Petroleum Engineering University of Calgary2500 University Dr.NWCalgaryAB T2N 1N4Canada Department of Mechanical Engineering GMR Institute of TechnologyRajamAndhra Pradesh 532127India Faculty of Mechanical Engineering and Mechanics Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and PipelineNingbo UniversityNingbo 315211China Department of Chemical Engineering Imperial College LondonLondon SW72AZUK Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China Chemistry Department College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Department of Condensed Matter Physics Hokkaido UniversitySapporoHokkaido 060-0810Japan School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta 30332GAUSA Laboratory on Convective Heat and Mass Transfer Tomsk State UniversityTomsk 634045Russia

Due to the push for carbon neutrality in various human activities,the development of methods for producing electricity without relying on chemical reaction processes or heat sources has become highly ***,the challenge lies in achieving microwatt-scale outputs due to the inherent conductivity of the materials and diverting electric *** address this challenge,our research has concentrated on utilizing nonconductive mediums for water-based low-cost microfibrous ceramic wools in conjunction with a NaCl aqueous solution for power *** main source of electricity originates from the directed movement of water molecules and surface ions through densely packed microfibrous ceramic wools due to the effect of dynamic electric double *** occurrence bears resemblance to the natural water transpiration in plants,thereby presenting a fresh and straightforward approach for producing electricity in an ecofriendly *** generator module demonstrated in this study,measuring 12×6 cm^(2),exhibited a noteworthy open-circuit voltage of 0.35 V,coupled with a short-circuit current of 0.51 *** low-cost ceramic wools are suitable for ubiquitous,permanent energy sources and hold potential for use as self-powered sensors and systems,eliminating the requirement for external energy sources such as sunlight or heat.

关键词： ceramic microfibers energy harvesting power generation self-powered systems water evaporation

来源：评论

学校读者我要写书评

暂无评论

Unusually high corrosion resistance in Mo_(x)CrNiCo medium entropy alloy enhanced by acidity in aqueous solution

引用

Journal of materials science & Technology 2023年第8期139卷 59-68页

作者： S.Shuang G.J.Lyu D.Chung X.Z.Wang X.Gao H.H.Mao W.P.Li Q.F.He B.S.Guo X.Y.Zhong Y.J.Wang Y.Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Unit of Structures Department of Materials Science and EngineeringKTHStockholm SE-10044Sweden Thermo-Calc Software Råsundav.18SolnaSE-16767Sweden Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina

High corrosion resistance of alloys is essential for their structural applications;however,most alloys suffer from degradation of their corrosion resistance with the increasing acidity of their ***,we developed a series of medium-entropy alloys(MEAs)in this work,which ex-hibit high strength,superior fracture toughness and ultra-high corrosion resistance,outperforming the variety of corrosion resistant alloys hitherto *** interestingly,our MEAs exhibit an unusual anti-corrosion behavior and their corrosion resistance increases with acidity in Cl−containing *** extensive thermodynamic calculations,density functional theory(DFT)simulations and experi-ments,we reveal that the unusual anti-corrosion behavior of our MEAs can be attributed to their surface chemical complexity,which facilitates the physio-chemical-absorption of H_(2)O and O_(2)and thus the rapid formation of metastable medium entropy passive films that contain the lowest amount of defects,as compared to the passive films on conventional alloys reported in the literature.

关键词： Corrosion Passivation Alloy design Multi-principal element alloys Medium-entropy alloys

来源：评论

学校读者我要写书评

暂无评论

Phase separation and domain crystallinity control enable open-air-printable highly efficient and sustainable organic photovoltaics

引用

InfoMat 2024年第3期6卷 131-143页

作者： Jie Lv Xiaokang Sun Hua Tang Fei Wang Guangye Zhang Liangxiang Zhu Jiaming Huang Qianguang Yang Shirong Lu Gang Li Frédéric Laquai Hanlin Hu Hoffmann Institute of Advanced Materials Shenzhen Polytechnic UniversityShenzhenthe People's Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhenthe People's Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtanthe People's Republic of China KAUST Solar Center Physical Sciences and Engineering Division(PSE)Materials Science and Engineering Program(MSE)King Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia College of New Materials and New Energies Shenzhen Technology UniversityShenzhenthe People's Republic of China Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong Kong SARthe People's Republic of China Department of Material Science and Technology Taizhou UniversityTaizhouthe People's Republic of China

Organic solar cells(OSCs)have emerged as a promising solution for sustainable energy production,offering advantages such as a low carbon footprint,short energy payback period,and compatibility with ***,the use of hazardous solvents continues to dominate the best-performing OSCs,mainly because of the challenges of controlling phase separation and domain crystallinity in *** this study,we combined the solvent vapor treatment of CS2 and thermal annealing to precisely control the phase separation and domain crystallinity in PM6:M-Cl and PM6:O-Cl systems processed with the eco-solvent *** method resulted in a maximum power conversion efficiency(PCE)of 18.4%,which is among the highest values reported for sustainable binary ***,the fabrication techniques were transferred from spin coating in a nitrogen environment to blade printing in ambient air,retaining a PCE of 16.0%,showing its potential for high-throughput and scalable *** addition,a comparative analysis of OSCs processed with hazardous and green solvents was conducted to reveal the differences in phase *** work not only underscores the significance of sustainability in OSCs but also lays the groundwork for unlocking the full potential of open-air-printable sustainable OSCs for commercialization.

关键词： open-air printable organic solar cells sustainability

来源：评论

学校读者我要写书评

暂无评论

Laser powder bed fusion of a Ni3Al-based intermetallic alloy with tailored microstructure and superior mechanical performance

Advanced Powder Materials

引用

Advanced Powder materials 2024年第1期3卷 90-101页

作者： Mingyu Liu Jiang Wang Tao Hu Songzhe Xu Sansan Shuai Weidong Xuan Shuo Yin Chaoyue Chen Zhongming Ren State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Parsons Building Department of MechanicalManufacturing and Biomedical EngineeringTrinity College DublinThe University of DublinDublinIreland College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China

Ni3Al-based alloys are excellent candidates for the structural materials used for turbine engines due to their excellent high-temperature *** study aims at laser powder bed fusion and post-hot isostatic pressing(HIP)treatment of Ni3Al-based IC^(-2)21 M alloy with a highγ0 volume *** as-built samples exhibits unavoidable solidification cracking and ductility dip cracking,and the laser parameter optimization can reduce the crack density to 1.34 mm/mm^(2).Transmission electron microscope(TEM)analysis reveals ultra-fine nanoscaleγ0 phases in the as-built samples due to the high cooling rate during rapid *** HIP treatment,a fully dense structure without cracking defects is achieved,which exhibits an equiaxed structure with grain size~120-180μm and irregularly shapedγ0 precipitates~1-3μm with a prominently high fraction of 86%.The room-temperature tensile test of as-built samples shows a high ultimate tensile strength(σUTS)of 1039.7 MPa and low fracture elongation of 6.4%.After HIP treatment,a significant improvement in ductility(15.7%)and a slight loss of strength(σUTS of 831.7 MPa)are obtained by eliminating the crack *** the as-built and HIP samples exhibit retained highσUTS values of 589.8 MPa and 786.2 MPa,respectively,at *** HIP samples exhibita slight decrease in ductility to~12.9%,indicating excellent high-temperature mechanical ***,the abnormal increase in strength and decrease in ductility suggest the critical role of a highγ0 fraction in cracking *** intrinsic heat treatment during repeating thermal cycles can induce brittleness and trigger cracking initiation in the heat-affected zone with notable deteriorating *** results indicate that the combination of LPBF and HIP can effectively reduce the crack density and enhance the mechanical properties of Ni_(3)Al-based alloy,making it a promising material for high-temperature applications.

关键词： Laser powder bed fusion Ni3Al-Based alloy Hot isostatic pressing Solidification cracking High-temperature tensile performance

来源：评论

学校读者我要写书评

暂无评论

Migration and proliferation drive the emergence of patterns in co-cultures of differentiating vascular progenitor cells

引用

Mathematical Biosciences and engineering 2024年第8期21卷 6731-6757页

作者： Zamora Alvarado, Jose E. McCloskey, Kara E. Gopinathan, Ajay School of Engineering University of California Merced MercedCA95343 United States Graduate Program in Materials and Biomaterials Science and Engineering University of California Merced MercedCA95343 United States Department of Physics University of California Merced MercedCA95343 United States

Vascular cells self-organize into unique structures guided by cell proliferation, migration, and/or differentiation from neighboring cells, mechanical factors, and/or soluble signals. However, the relative contribution of each of these factors remains unclear. Our objective was to develop a computational model to explore the different factors affecting the emerging micropatterns in 2D. This was accomplished by developing a stochastic on-lattice population-based model starting with vascular progenitor cells with the potential to proliferate, migrate, and/or differentiate into either endothelial cells or smooth muscle cells. The simulation results yielded patterns that were qualitatively and quantitatively consistent with experimental observations. Our results suggested that post-differentiation cell migration and proliferation when balanced could generate between 30–70% of each cell type enabling the formation of vascular patterns. Moreover, the cell-to-cell sensing could enhance the robustness of this patterning. These findings computationally supported that 2D patterning is mechanistically similar to current microfluidic platforms that take advantage of the migration-directed self-assembly of mature endothelial and mural cells to generate perfusable 3D vasculature in permissible hydrogel environments and suggest that stem or progenitor cells may not be fully necessary components in many tissue formations like those formed by vasculogenesis. ©2024 the Author(s)

关键词： Endothelial cells

来源：评论

学校读者我要写书评

暂无评论

Key Technologies and Prospects for Electric Vehicles Within Emerging Power Systems: Insights from Five Aspects

引用

CSEE Journal of Power and Energy Systems 2024年第2期10卷 439-447页

作者： Yalun Li Minggao Ouyang C.C.Chan Xueliang Sun Yonghua Song Wei Cai Yilin Xie Yuqiong Mao Department of Electrical Engineering and School of Vehicle and MobilityTsinghua UniversityBeijing 100084China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China Department of Electrical and Electronic Engineering The University of Hong KongHong Kong 999077China Department of Mechanical and Materials Engineering University of Western OntarioLondonON N6A 3K7Canada State Key Laboratory of Internet of Things for Smart City University of MacaoTaipaMacao 999078China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080China

The energy revolution requires coordination in energy consumption, supply, storage and institutional *** energy generation technologies, along with their associated costs, are already fully equipped for large-scale ***, energy storage remains a bottleneck, and solutions areneeded through the use of electric vehicles, which traditionallyplay the role of energy consumption in power systems. Toclarify the key technologies and institutions that support EVsas terminals for energy use, storage, and feedback, the CSEEJPES forum assembled renowned experts and scholars in relevantfields to deliver keynote reports and engage in discussions ontopics such as vehicle–grid integration technology, advancedsolid-state battery technology, high-performance electric motortechnology, and institutional innovation in the industry *** experts also provided prospects for energy storage andutilization technologies capable of decarbonizing new powersystems.

关键词： Electric vehicles engineering philosophy highpower density motor new power system solid state batteries vehicle grid integration.

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：