检索结果-内蒙古大学图书馆

Lecture Notes in mechanical engineering 2019年 89-97页

作者： Kumawat, Vikesh P. Divate, Nikhil S. Bansode, Sangeeta Patel, Amit Kumar Jagtap, Kailas S. CAD CAM and Robotics K J Somaiya College of Engineering Mumbai400 077 India Department of Mechanical Engineering K J Somaiya College of Engineering Mumbai400 077 India Tata Power Mumbai India

Belt conveyors are a critical part which plays an important role in the mining, processing, and transportation of coal in thermal power plant. It is necessary that the conveyor system must operate maximum efficiency without any major breakdown. The project consists of an implementation of sensor, hardware and software platform which measures temperature and noise level of each bearing of roller with frame number and generates the report cum warning system and live video output of maintenance carried by robot in controlling computer. The implementation of robot with real-time online condition monitoring of roller in conveyor system of thermal power plant will reduce the overall maintenance cost of thermal power plant and it will also save the man power and improve the safety which requires during maintenance personnel. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Coal

来源：评论

学校读者我要写书评

暂无评论

Confining and channeling sound through coupled resonators

arXiv

引用

arXiv 2020年

作者： Zhou, Yun Bandaru, Prabhakar R. Sievenpiper, Daniel F. Department of Mechanical Engineering University of California San Diego San DiegoCA92093 United States Program in Materials Science University of California San Diego San DiegoCA92093 United States Department of Electrical Engineering University of California San Diego San DiegoCA92093 United States

Confining sound is of significant importance for the manipulation and routing acoustic waves. We propose a Helmholtz resonator (HR) based subwavelength sound channel formed at the interface of two metamaterials, for this purpose. The confinement is quantified through (i) a substantial reduction of the pressure, and (ii) an increase in a specific acoustic impedance (defined by the ratio of the local pressure to the sound velocity) - to a very large value outside the channel. The sound confinement is robust to frequency as well as spatial disorder at the interface, as long as the interface related edge mode is situated within the band gap. A closed acoustic circuit was formed by introducing controlled disorder in the HR units at the corners, indicating the possibility of confining sound to a point. Copyright © 2020, The Authors. All rights reserved.

关键词： Acoustic impedance

来源：评论

学校读者我要写书评

暂无评论

[email protected] as high-performance and durable electrocatalyst for oxygen reduction reaction in alkaline membrane fuel cells

引用

Journal of Alloys and Compounds 2023年 938卷

作者： Shaik Gouse Peera Chao Liu Arunchander Asokan Matthew E. Suss Department of Environmental Science Keimyung University 1095 Dalseo-gu Daegu 42601 Republic of Korea Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou 341000 China Faculty of Mechanical Engineering Technion – Israel Institute of Technology Haifa 320003 Israel Grand Technion Energy Program Technion – Israel Institute of Technology Haifa 3200003 Israel Wolfson Department of Chemical Engineering Technion – Israel Institute of Technology Haifa 3200003 Israel

Discovery of electrocatalysts composed of cheap transition metals are urgent to replace the traditional Pt/C catalyst used for oxygen reduction reaction (ORR). Herein, we synthesized Cu nanoparticles encapsulated with nitrogen-doped carbon ( [email protected] ) as an excellent and durable catalyst for ORR. A systematic evaluation of the effect of Cu content, acid leaching and secondary heat treatment have been established with the help of half-cell studies. The morphological analysis revealed that Cu nanoparticles surrounded by thick nitrogen doped carbon layers and further, the acid leaching and subsequent pyrolysis, boosted the electrocatalytic performance. The optimized [email protected] catalyst showed onset potential (potential corresponding to a current density of 0.10 mA cm −2 ) and half-wave potential of 0.97 V vs. RHE and 0.85 V vs. RHE, surpassing the state-of-the-art Pt/C catalyst. In addition, the [email protected] catalyst exhibited outstanding durability, tolerance to carbon monoxide and methanol molecules. In the alkaline fuel cell, [email protected] catalyst delivered 118 mW cm −2 peak power density in alkaline fuel cell operated with H 2 -O 2 , whereas Pt/C only delivered a peak power density of 97 mW cm −2 under ambient operating conditions. High ORR activity and better stability of [email protected] catalyst could be a potential alternative to Pt/C catalyst in alkaline fuel cells and metal-air cell cathodes.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Publisher's Note: “Contrast-enhanced ultrasound tracking of helical propellers with acoustic phase analysis and comparison with color Doppler” [APL Bioeng. 6, 036102 (2022)]

引用

APL Bioengineering 2022年第3期6卷

作者： S. Pane M. Zhang V. Iacovacci L. Zhang A. Menciassi 1The BioRobotics Institute Scuola Superiore Sant'Anna Pisa Italy 2Department of Excellence in Robotics & AI Scuola Superiore Sant'Anna Pisa Italy 3Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong SAR China

This article was originally published online on 2 August 2022 with errors in the reference numbering through the text.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nanoscale 3D printing of glass photonic crystals with near-unity reflectance in the visible spectrum

引用

Science advances 2025年第21期11卷 eadv0267页

作者： Wang Zhang Hongtao Wang Hao Wang Son Tung Ha Lei Chen Xue Liang Li Cheng-Feng Pan Bochang Wu Md Abdur Rahman Yujie Ke Qifeng Ruan Xiaolong Yang Thomas Christensen Joel K W Yang Engineering Product Development Singapore University of Technology and Design Singapore 487372 Singapore. Singapore-HUJ Alliance for Research and Enterprise (SHARE) The Smart Grippers for Soft Robotics (SGSR) Programme Campus for Research Excellence and Technological Enterprise (CREATE) Singapore 138602 Singapore. School of Instrumentation and Optoelectronic Engineering Beihang University Beijing 100191 China. Hangzhou International Innovation Institute Beihang University Hangzhou 311115 China. Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore. College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China. Department of Electrical and Computer Engineering National University of Singapore (NUS) 4 Engineering Drive 3 Singapore 117576 Singapore. School of Interdisciplinary Studies Lingnan University Tuen Mun Hong Kong SAR China. Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China. College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China. Department of Electrical and Photonics Engineering Technical University of Denmark Kongens Lyngby 2800 Denmark. POLIMA-Center for Polariton-driven Light-Matter Interactions University of Southern Denmark Campusvej 55 DK-5230 Odense M Denmark.

Glass is widely used as an optical material due to its high transparency, thermal stability, and mechanical properties. The ability to fabricate and sculpt glass at the nanoscale would naturally expand its application domain in nanophotonics. Here, we report an approach to print glass in three dimensions with nanoscale resolutions. We developed Glass-Nano, an organic-inorganic hybrid resin containing silicon elements. Using this high-resolution resin, three-dimensional (3D) photonic crystals (PhCs) were printed with two-photon lithography. After printing, the structures were heated to high temperatures in air to remove organic components and convert the remaining material into silica glass. 3D glass PhCs with periodicities as small as 260 nanometers were obtained after sintering at 650°C. The 3D glass PhCs exhibit ~100% reflectance in the visible range, surpassing the typical reflectances observed from similar structures in low-refractive index materials. The quality of PhCs achieved is observed in both electron microscopy and the excellent agreement with band structure calculations of idealized structures.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dynamic Load Comparison between Fully Coupled and Simplified Models on Offshore Wind Turbines with Jacket Support Structures under Seismic Conditions 28

Dynamic Load Comparison between Fully Coupled and Simplified...

引用

28th International Ocean and Polar engineering Conference, 2018

作者： Lai, Wen-Jeng Su, Wei-Nian Huang, Chin-Cheng Huang, Yi-Mei Mechanical and System Engineering Program Institute of Nuclear Energy Research Taiwan Department of Mechanical Engineering National Central University Taiwan

ISBN: (纸本)9781880653876

The dynamic load calculation of offshore wind turbine is an important technology in the future development of wind turbine industry in Taiwan. This paper presents a simplified equivalent-monopile model of reducing the dynamic load simulation time for offshore wind turbines with jacket support structures under seismic conditions. The FAST v7 code that only simulates monopile substructure is chosen as the analysis tool and is further recompiled to include the effect of seismic-pile-soil interaction in the simplified model. The numerical analysis results are then validated by comparing with the results from the fully coupled model, calculated by Bladed software, in a NREL 5MW offshore wind turbine. Two seismic load scenarios, operational and idling conditions, are studied in this work. The results show that usage of simplified model may offer advantages in preliminary support structure design. The advantages are apparent in seismic simulation since the simplified equivalent-monopile modeling allows current FAST v.7 code constraints relaxed for simulating jacket structures and leads to quicker and more convenient dynamic load calculation. The influence of earthquake and soil flexibility is especially important in design considerations since Taiwan is located in a seismically active region. Thus, the developed simplified numerical model will be helpful to shorten the simulation time of a series of seismic design load cases in the preliminary design phase. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Dynamic loads

来源：评论

学校读者我要写书评

暂无评论

Expansion-mediated breakup of bubbles and droplets in microfluidics

引用

Physical Review Fluids 2020年第1期5卷 013602-013602页

作者： Alinaghi Salari Jiang Xu Michael C. Kolios Scott S. H. Tsai Institute for Biomedical Engineering Science and Technology (iBEST) Toronto Ontario M5B 1T8 Canada Biomedical Engineering Graduate Program Ryerson University Toronto Ontario M5B 2K3 Canada Department of Mechanical and Industrial Engineering Ryerson University Toronto Ontario M5B 2K3 Canada Department of Physics Ryerson University Toronto Ontario M5B 2K3 Canada

This paper reports a breakup regime of bubbles and droplets that is caused by a sudden channel expansion in a microfluidic device. In this regime, bubbles or droplets generated at a flow-focusing geometry periodically breakup into smaller bubbles or droplets, respectively, upon entering an expansion. In addition to Capillary number Ca, which is previously shown to govern the dispersion breakup in such geometries, we find that, at a high-inertia regime, the Weber number We also plays a significant role in specifying the transition from non-breakup to breakup regimes. Furthermore, we identify different periodic breakup modes, for example, symmetric and asymmetric breakup, which are dictated by the Ohnesorge number. A power law of f0.5∝We0.1Ca0.2, where f denotes the frequency at which the dispersions arrive at the expansion region, governs when the droplets and bubbles breakup. This power law highlights the importance of inertia to the dispersion breakup in an expansion-mediated geometry. Our results demonstrate that, without modifying the geometry and by only tuning several dimensionless parameters related to the fluid flow, a microchannel expansion region can produce mono-, bi-, or tri-disperse bubble or droplet populations. These discoveries may find utility in the design of multi-disperse bubble or droplet populations using microfluidics.

关键词： Drop & bubble phenomena Drop breakup Microfluidics Microstructure Multiphase flows Gas-liquid interfaces Liquid-liquid interfaces Microbubbles Multiscale modeling Optical microscopy

来源：评论

学校读者我要写书评

暂无评论

Author Correction: Super-resolution multicolor fluorescence microscopy enabled by an apochromatic super-oscillatory lens with extended depth-of-focus

引用

Nature communications 2024年第1期15卷 1510页

作者： Wenli Li Pei He Dangyuan Lei Yulong Fan Yangtao Du Bo Gao Zhiqin Chu Longqiu Li Kaipeng Liu Chengxu An Weizheng Yuan Yiting Yu Ningbo Institute of Northwestern Polytechnical University College of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072 China. Key Laboratory of Micro/Nano Systems for Aerospace (Ministry of Education) Northwestern Polytechnical University Xi'an 710072 China. Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems Northwestern Polytechnical University Xi'an 710072 China. Department of Materials Science and Engineering City University of Hong Kong Hong Kong 999077 China. dangylei@cityu.edu.hk. Department of Materials Science and Engineering City University of Hong Kong Hong Kong 999077 China. The Institute of AI and Robotics Fudan University Shanghai 200433 China. Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710119 China. Department of Electrical and Electronic Engineering Joint Appointment with School of Biomedical Sciences The University of Hong Kong Hong Kong 999077 China. State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang 150001 China. Ningbo Institute of Northwestern Polytechnical University College of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072 China. yyt@***. Key Laboratory of Micro/Nano Systems for Aerospace (Ministry of Education) Northwestern Polytechnical University Xi'an 710072 China. yyt@***. Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems Northwestern Polytechnical University Xi'an 710072 China. yyt@***.

来源：评论

学校读者我要写书评

暂无评论

xSCYTE: Express Single-frame Cytometer through Tomographic Phase

arXiv

引用

arXiv 2022年

作者： Ge, Baoliang He, Yanping Deng, Mo Rahman, Md Habibur Wang, Yijin Wu, Ziling Yang, Yongliang Kuang, Cuifang Wong, Chung Hong N. Chan, Michael K. Ho, Yi-Ping Duan, Liting Yaqoob, Zahid So, Peter T.C. Barbastathis, George Zhou, Renjie Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Laser Biomedical Research Center Massachusetts Institute of Technology CambridgeMA02139 United States Department of Biomedical Engineering The Chinese University of Hong Kong Shatin New Territories Hong Kong School of Artificial Intelligence Science and Technology University of Shanghai for Science and Technology Shanghai200093 China Institute of Photonic Chips University of Shanghai for Science and Technology Shanghai200093 China The State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou310027 China School of Life Sciences The Chinese University of Hong Kong Shatin New Territories Hong Kong Centre for Novel Biomaterials The Chinese University of Hong Kong Shatin New Territories Hong Kong Hong Kong Branch of CAS Center for Excellence in Animal Evolution and Genetics The Chinese University of Hong Kong Shatin New Territories Hong Kong Department of Biological Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Singapore-MIT Alliance for Research and Technology Centre Singapore Singapore-MIT Alliance for Research and Technology Centre Singapore

Rapid, comprehensive, and accurate cell phenotyping without compromising viability, is crucial to many important biomedical applications, including stem-cell therapy, drug screening, and liquid biopsy. Typical image cytometry methods acquire two-dimensional (2D) fluorescence images, where the fluorescence labelling process may damage living cells, and the information from 2D images is not comprehensive enough for precise cell analysis. Although three-dimensional (3D) label-free image cytometry holds great promise, its high throughput development faces several technical challenges. Here, we report eXpress Single-frame CYtometer through Tomographic phasE (xSCYTE), which reconstructs 3D Refractive Index (RI) maps of cells with diffraction-limited resolution. xSCYTE is built on a versatile quantitative phase microscope, whose label-free imaging nature allows in-situ, long-time, reusable live-cell analysis. Further, with angle-multiplexing illumination and a pre-trained physics-incorporating Deep Neural Network, xSCYTE can map the 3D RI distribution of a cell by acquiring only a single frame that allows rapid image reconstruction and holds the potential for real-time analysis. By flowing large quantities of cells through a microfluidic channel and equipping xSCYTE with a high-speed camera, we have demonstrated an unprecedented 3D imaging throughput of over 20,000 cells/second while providing sufficient morphological information to distinguish different cellular species. The biomedical application potential of xSCYTE has been evaluated by visualizing and quantifying shear-induced 3D transient deformation of red blood cells that can be correlated with several blood pathologies. With these high-speed and high-precision imaging capabilities empowered by artificial intelligence, we envision xSCYTE may open up many new avenues of biomedical investigations and industries, such as multi-omic assays and quality control during cellular therapeutic manufacturing. © 2022, CC BY-NC-S

关键词： High speed cameras

来源：评论

学校读者我要写书评

暂无评论

Highly Elastic Interconnected Porous Hydrogels through Self-Assembled Templating for Solar Water Purification

引用

Angewandte Chemie 2021年第3期134卷

作者： Youhong Guo Dr. Luize Scalco de Vasconcelos Dr. Neha Manohar Dr. Jiafeng Geng Prof. Keith P. Johnston Prof. Guihua Yu Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin Austin TX 78712 USA McKetta Department of Chemical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Chemical Engineering Chang'an University Xi'an Shannxi 710061 China

Interfacial evaporation using porous hydrogels has demonstrated highly effective solar evaporation performance under natural sunlight to ensure an affordable clean water supply. However, it remains challenging to realize scalable and ready-to-use hydrogel materials with durable mechanical properties. Here, self-assembled templating (SAT) is developed as a simple yet effective method to fabricate large-scale elastic hydrogel evaporators with excellent desalination performance. The highly interconnected porous structure of the hydrogels with low tortuosity and tunable pore size enables high level of tunability on the water transport rate. With superior elasticity, the porous hydrogels are easy to process with a rapid shape recovery after being rolled, folded, and twisted over hundred times, and exhibit highly effective and stable evaporation with an evaporation rate of ≈2.8 kg m −2 h −1 and ≈90 % solar-to-vapor efficiency. It is anticipated that this SAT strategy, without the typical need for freeze-drying, will accelerate the industrialization of hydrogel solar evaporators for practical applications.

关键词： elasticity interconnectivity porous hydrogels solar water purification template synthesis

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：