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Research on large equipment maintenance system in life cycle

IOP Conference Series: Earth and Environmental science 2017年第1期69卷

作者： Xiaowei Xu Hongxia Wang Zhenxing Liu Nan Zhang School of Automobile and Traffic Engineering Wuhan University of Science and Technology Wuhan 430081 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang 441053 China

In order to change the current disadvantages of traditional large equipment maintenance concept, this article plans to apply the technical method of prognostics and health management to optimize equipment maintenance strategy and develop large equipment maintenance system. Combined with the maintenance procedures of various phases in life cycle, it concluded the formulation methods of maintenance program and implement plans of maintenance work. In the meantime, it takes account into the example of the dredger power system of the Waterway Bureau to establish the auxiliary platform of ship maintenance system in life cycle.

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Accelerated performance degradation test and analysis of high-temperature strain gauges

Accelerated performance degradation test and analysis of hig...

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13th International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE 2023)

作者： L. Li Z. Wang N. Yang Q. Wu H. Wang Z. Mao K. Ren Q. Wang Y. Wang National Key Laboratory of Strength and Structural Integrity School of Aeronautic Science and Engineering Beihang University Beijing People's Republic of China Shenyang Aircraft Design and Research Institute Shenyang People's Republic of China Institute of Spacecraft System Engineering China Academy of Space Technology Beijing People's Republic of China Navigation Instrument Research Institute Tianjin People's Republic of China Beijing Institute of Control Engineering Beijing People's Republic of China

ISBN: (数字)9781839539275

With the extension of the service time of the structure and the worse service temperature conditions, the drift problem of hightemperature strain gauges gradually becomes prominent. This research aims to address the issue of the drift of measurement results because of the performance degradation of high-temperature strain gauges, and investigate the drift law under different temperatures considering complex service environments. In this paper, a combination of experimental research and theoretical analysis is utilized to design and conduct the accelerated performance degradation test on high-temperature strain gauges. Based on the result of the test, an accelerated performance degradation model is developed using the Wiener process and Arrhenius model. Finally, estimation curves for the average value and percentile value of the performance parameters of the hightemperature strain gauges are obtained, which demonstrates that the established accelerated performance degradation model can reasonably describe the degradation law. Additionally, the established accelerated performance degradation model enables effective analysis and compensation of gauge drift at any temperature.

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Current nuclear data needs for applications

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Physical Review Research 2022年第2期4卷 021001-021001页

作者： Karolina Kolos Vladimir Sobes Ramona Vogt Catherine E. Romano Michael S. Smith Lee A. Bernstein David A. Brown Mary T. Burkey Yaron Danon Mohamed A. Elsawi Bethany L. Goldblum Lawrence H. Heilbronn Susan L. Hogle Jesson Hutchinson Ben Loer Elizabeth A. McCutchan Matthew R. Mumpower Ellen M. O'Brien Catherine Percher Patrick N. Peplowski Jennifer J. Ressler Nicolas Schunck Nicholas W. Thompson Andrew S. Voyles William Wieselquist Michael Zerkle Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Nuclear Engineering University of Tennessee Knoxville Tennessee 37996 USA Department of Physics and Astronomy University of California Davis California 95516 USA IB3 Global Solutions Oak Ridge Tennessee 37830 USA Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA University of California Department of Nuclear Engineering Berkeley California 94720 USA Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Nuclear Data Center Brookhaven National Laboratory Upton New York 11973 USA Design Physics Division Lawrence Livermore National Laboratory Livermore California 94550 USA Rensselaer Polytechnic Institute Department of Mechanical Aerospace and Nuclear Engineering 110 8th Street Troy New York 12180 USA Signature Science and Technology Division Pacific Northwest National Laboratory Richland Washington 99352 USA Xe-Mobile Division X-Energy LLC Rockville Maryland 20852 USA Radioisotope Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA NEN-2 Advanced Nuclear Technology Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Chemistry Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Nuclear Criticality Safety Division Lawrence Livermore National Laboratory Livermore California 94550 USA Johns Hopkins University Applied Physics Laboratory Laurel Maryland 20723 USA Nuclear Energy and Fuel Cycle Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Reactor Technology Department Naval Nuclear Laboratory West Mifflin Pennsylvania 15122 USA

Accurate nuclear data provide an essential foundation for advances in a wide range of fields, including nuclear energy, nuclear safety and security, safeguards, nuclear medicine, and planetary and space exploration. In these and other critical domains, outdated, imprecise, and incomplete nuclear data can hinder progress, limit precision, and compromise safety. Similar nuclear data needs are shared by many applications, thus prioritizing these needs is especially important and urgently needed. Many levels of analysis are required to prepare nuclear measurements for employment in end-user applications. Because research expertise is typically limited to one level, collaboration across organizations and international borders is essential. This perspective piece provides the latest advances in nuclear data for applications and describes an outlook for both near- and long-term progress in the field.

关键词： Nuclear engineering Nuclear reactors Quantum computation Monte Carlo methods Nuclear data analysis & compilation

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Liquid Metal Manifold Microchannel Heat Sink for Ultra-High Heat Flux Cooling

SSRN

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SSRN 2024年

作者： Zhang, Mingkuan Gao, Qi Zhao, Zhiyuan Guo, Luna Li, Xuan Zhang, Chao Zhang, Xudong Rao, Wei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China School of mechanical engineering Tianjin University of Commerce Tianjin300134 China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai200240 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing Beijing100084 China CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Beijing100190 China

The reduction in transistor dimensions and advancements in chip integration have led to a dramatic increase in the heat flux of chip. Advanced heat dissipation technology has become the pivotal in ensuring the normal operation of chips and fully utilizing chip performance. Room temperature liquid metal convection cooling technology has demonstrated its efficacy as a viable approach for addressing high heat flux heat dissipation. However, the smaller specific heat capacity of liquid metal leads to a large temperature rise, imposing a constraint on the progression of liquid metal cooling technology. To overcome this drawback, this paper proposed a liquid metal manifold channel structure designed to convert the continuous long-range flow into a segmented short-range flow. The good matching between liquid metal and manifold structures is adequately demonstrated through a comparison with alternative coolant and channel structure. The simulation results demonstrate the effectiveness of liquid metal manifold channel cooling in dealing with a heat flux of 1000 W/cm², ensuring that the maximum temperature of the chip remains below 351.7 K. Moreover, the convective heat transfer coefficient even reaches 106 W/(m2·K), which is ten times larger than that of water conventional microchannel heat sink. The orthogonal experiments were conducted to analyze how the structural parameters affect the dissipation performance, including the height of the microchannel, ratio of manifold length to fin length, length of fin in manifold, width of channel, and ratio of fin with to channel width. It concluded that the height of the microchannel has been identified as the most critical factor. This manifold structure mitigates the inherent limitation of the lower specific heat capacity of liquid metal, paving the way for effective thermal management of electronic devices subjected to ultra-high heat flux. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Initiating a High-Rate and Stable Aqueous Air Battery by Using Organic N-Heterocycle Anode

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Angewandte Chemie 2024年第11期136卷

作者： Dr. Senlin Li Dr. Sanlue Hu Prof. Hongfei Li Prof. Cuiping Han Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

Alkaline metal-air batteries are advantageous in high voltage, low cost, and high safety. However, metal anodes are heavily eroded in strong alkaline electrolytes, causing serious side reactions including dendrite growth, passivation, and hydrogen evolution. To address this limitation, we successfully synthesized an organic N-heterocycle compound (NHCC) to serve as an alternative anode. This compound not only exhibits remarkable stability but also possesses a low redox potential (−1.04 V vs. Hg/HgO) in alkaline environments. To effectively complement the low redox potential of the NHCC anode, we designed a dual-salt highly concentrated electrolyte (4.0 M KOH+10.0 M KCF 3 SO 3 ). This electrolyte expands the electrochemical stability window to 2.3 V through the robust interaction between the O atom in H 2 O molecule with the K + of KCF 3 SO 3 (H−O⋅⋅⋅KCF 3 SO 3 ). We further demonstrated the K + uptaken/extraction storage mechanism of NHCC anodes. Consequently, the alkaline aqueous NHCC anode-air batteries delivers a high battery voltage of 1.6 V, high-rate performance (101.9 mAh g −1 at 100 A g −1 ) and long cycle ability (30,000 cycles). Our work offers a molecular engineering strategy for superior organic anode materials and develops a novel double superconcentrated conductive salt electrolyte for the construction of high-rate, long-cycle alkaline aqueous organic anode-air batteries.

关键词： Alkaline Aqueous Electrolyte Superconcentrated Electrolyte N-Heterocycle Compounds Organic Anode Air Battery

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The Age of Generative AI and AI-Generated Everything

arXiv

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arXiv 2023年

作者： Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Zhang, Ping Cui, Shuguang Shen, Xuemin Mao, Shiwen Han, Zhu Jamalipour, Abbas Vincent Poor, H. Kim, Dong In School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Chinese University of Hong Kong Shenzhen China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of

Generative AI (GAI) has emerged as a significant advancement in artificial intelligence, renowned for its language and image generation capabilities. This paper presents "AIGenerated Everything" (AIGX), a concept that extends GAI beyond mere content creation to real-time adaptation and control across diverse technological domains. In networking, AIGX collaborates closely with physical, data link, network, and application layers to enhance real-time network management that responds to various system and service settings as well as application and user requirements. Networks, in return, serve as crucial components in further AIGX capability optimization through the AIGX lifecycle, i.e., data collection, distributed pre-training, and rapid decision-making, thereby establishing a mutually enhancing interplay. Moreover, we offer an in-depth case study focused on power allocation to illustrate the interdependence between AIGX and networking systems. Through this exploration, the article analyzes the significant role of GAI for networking, clarifies the ways networks augment AIGX functionalities, and underscores the virtuous interactive cycle they form. This article paves the way for subsequent future research aimed at fully unlocking the potential of GAI and networks. © 2023, CC BY.

关键词： Decision making

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Numerical Comparison of Transpiration Cooling designs Using Real Gas Effects and Approximate Gas Model

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Journal of Physics: Conference Series 2021年第1期2097卷

作者： Meng Wang Jianhua Wang Fei He Kang Qian Yadong Wu Guangsheng Zhu CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 Anhui China Beijing Institute of Astronautical System Engineering Beijing 100076 China

In the severe high-temperature environment caused by aerodynamic heating, the vibrational excitation, dissociation and ionization of gas may successively occur, which are known as real gas effects. Under the real gas effects, the thermodynamic properties of gas vary drastically and significantly influence the performances of the active thermal protection system of hypersonic vehicles, especially in the case with coolant outflow, for example transpiration cooling. This paper numerically investigates the transpiration cooling performance with the consideration of the interaction between coolant outflow and hypersonic flow under the real gas effects. The mathematical models and coupled numerical strategy are firstly validated by experimental data, then the influences of real gas effects on the transpiration cooling of a wedged leading edge (WLE) are studied under a flight Mach number range from 8 to 12 and a flight height of 40 km. The analysis and discussions of the numerical results reveal some important phenomena and demonstrate the need to consider real gas effects.

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The Investigation of Removal and Mechanism by Different Permeable Paving systems on Runoff Pollutants

SSRN

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SSRN 2024年

作者： Zhang, Ziyang Yang, Ying Li, Zhifei Chen, Hongrui Zhang, Xiaoran Gong, Yongwei Tan, Chaohong Li, Haiyan Key Laboratory of Urban Stormwater System and Water Environment Ministry of Education Beijing University of Civil Engineering and Architecture Beijing102616 China Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial Ministry Co-construction Collaboration Innovation Center Beijing100044 China Beijing General Municipal Engineering Design ＆ Research Institute Co. Ltd Beijing100082 China CRRC Environmental Science & Technology Cooperation Beijing100067 China Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and Architecture Beijing100044 China

In order to investigate the runoff pollutant control effects by different types of permeable paving systems (PPS), Porous asphalt (PA), Porous concrete (PC), Cement brick (CTB), Ceramic brick (CCB), Sand base brick (SBB) and Shale brick (SB) were selected. The removal effects and mechanisms of six PPS and individual filler layer on chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3-N), total nitrogen (TN) and total phosphorus (TP)were investigated. Studies have shown that the removal of runoff pollutants varies widely among different PPS. PA had the best removal effect for nearly all runoff pollutants, which the maximum removal rate was 100% for both COD and NH4+-N. Permeable bricks could effectively control on NO3-N and TN pollutants, which the best removal efficiency were more than 94% for SB. Compared with other runoff pollutants, PC was more effective in removing TP with a removal rate of 95.8%. Furthermore, compared with surface material, base layer, subbase layer and soil layer were the most effective in controlling pollution in runoff, which the removal rate were more than 80%. Due to the deeper length, pollutants in runoff could contact with filler longer time and increased the removal efficiency. At the same time, graded gravel and medium sand have a stronger adsorption capacity for pollutants in runoff, resulting in a better purification. This study provides theoretical and practical significance not only for runoff pollution control, but also for the design and use of PPS in runoff. © 2024, The Authors. All rights reserved.

关键词： Fillers

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ADVANCES IN LONG-RANGE, HIGH-SPEED OPTICAL COMMUNICATION

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NAVAL ENGINEERS JOURNAL 1981年第4期93卷 39-48页

作者： BARTON, GG FELDMAN, S Mr. Sidney Feldman formerly with the Naval Applied Science Laboratory is presently with the Radiation Division of the Naval Surface Weapons Center White Oak Silver Spring Maryland. He planned and supervised laboratory experiments of many optical systems for fleet evaluation several of his designs now being standard in the fleet. He received his BA degree in Physics from Brooklyn College in 1941 and majored in Physics at the Brooklyn Polytechnic Institute. His professional memberships include the Optical Society of America American Association for the Advancement of Science and The Scientific Research Society of North America. He was the recipient of the Naval Ordnance Development Award in 1945 the Superior Achievement Award in 1957 the Quality Salary Increase Award in 1965 the Superior Accomplishment Award in 1967 1970 and 1979. Additionally he has been granted patents for a relamping tool for searchlights (1962) a lamp positioning mechanism for searchlights (1963) a daylnight digital sextant (1973) a portable sextant-computer system (1974) and with Mr. George Barton the remote-controlled LLLTV camera-sextant (1976) the automatic passive LLLTV-rangefinder (1977) and a patent disclosure for the omnidirectional transceiver (1980). Mr. George G. Barton has been employed by the Naval Research Laboratory Washington D. C. for the past ten years in the scientific and military application design engineering and fabrication of low light level TV camera systems. He was previously associated with the Smithsonian Institution and Northwestern University in the application of TV technology in astronomical investigations. He attended New York University Newark College of Engineering and New Mexico State University where he majored in Physical Optics. Presently he is with his own company BISMARC Inc. Harker's Island N.C. where he is involved principally in the design manufacture and marketing of sonar systems such as the unique VIDISEA fishscope research and development in electrooptic systems an

During periods of radio silence under Emission Control, communication depends on the slow ship-to-ship, manual-visual, 8-10 wpm Morse code signaling shutter searchlight employing the ac 1000-watt incandescent or the ac 1000-watt compact arc mercury-xenon lamp. These sources can be replaced by the dc compact arc xenon lamp to provide longer daylight ranges and highspeed (100 wpm teletype, 150 wpm Morse code, voice, etc.) communication since this source has superior brightness and the facility of considerably more rapid modulation. The excessive weight and size of the ac-dc power convertor and modulating circuitry which had prevented use of the dc xenon lamp have been overcome by developments in solid state electronics such as the rapid, high current, simmer-flash, 100 to one light output xenon lamp pulsing using the reliable, uncomplicated, low-cost silicon controlled rectifier shunt switch which could eliminate the mechanical signaling shutter. laboratory and sea evaluations have proved the feasibility of and provided the long daylight high-speed optical communication ranges that could be attained from operation of the dc 1000-watt and 2200-watt xenon lamps at the focus of 12-inch, 18-inch searchlights and in the Fresnel lens omni-directional beacon which a command ship uses to signal all ships in a task force at once. With these advances, optical communication provides the highspeed capability of radio communication, particularly, also, with the new omnidirectional transceiver.

关键词： SHIPS

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ON THE SUPERSINGULAR LOCUS OF SHIMURA VARIETIES FOR QUATERNIONIC UNITARY GROUPS

arXiv

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arXiv 2023年

作者： Terakado, Yasuhiro Xue, Jiangwei Yu, Chia-Fu School of System Design and Technology Tokyo Denki University 5 Senju Asahi-cho Adachi-ku Tokyo120-8551 Japan Collaborative Innovation Center of Mathematics School of Mathematics and Statistics Wuhan University Luojiashan Hubei Wuhan430072 China Hubei Key Laboratory of Computational Science Wuhan University Hubei Wuhan430072 China Institute of Mathematics Academia Sinica Astronomy Mathematics Building No. 1 Sec. 4 Roosevelt Rd. Taipei106319 Taiwan

We study a Shimura variety attached to a unitary similitude group of a skew-Hermitian form over a totally indefinite quaternion algebra over a totally real number field. We give a necessary and sufficient condition for the existence of skew-Hermitian self-dual lattices. Under this condition we show that the superspecial locus in the fiber at p of the associated Shimura variety is non-empty. We also give an explicit formula for the number of irreducible components of the supersingular locus when p is odd and unramified in the quaternion algebra. Copyright © 2023, The Authors. All rights reserved.

关键词： Algebra

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