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Development of a Mobile Sensing Unit and Its Prototype Implementation

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Tsinghua Science and Technology 2008年第S1期13卷 223-227页

作者： Yusuke Mizuno Yozo Fujino Keita Kataoka Yoshihiro Matsumoto Research Center for Environmental Safety Yamaguchi University Department of Civil Engineering The University of Tokyo Research and Development Center East Japan Railway Company Kansai Electric power co. Inc.

This paper represents a design and development of a mobile sensing unit as well as its prototype implementation for railway track monitoring. The unit co.sists of an ultra-small personal co.puter (PC), a global positioning system (GPS) receiver, an accelerometer and an ADC (Analog/Digital co.verter) so that the unit can trace the route while capturing an acceleration response of a passenger vehicle. The unit enables more frequent and qualitative data acquisition co.pared with traditional and the state of the practice railway track inspection equipments. Locating disorder is the key of our unit, which has a reasonable accuracy of positioning with GPS data, existing facilities landmarks, and car acceleration responses. The proposed unit is a promising device for efficient properties management of railway agencies. The prototype implementation shows a result that car acceleration responses are related with the track displacements in low frequencies. The results also imply that sensor settlement on a vehicle floor, not axes or bogies, is effective for capturing track vertical displacements.

关键词： mobile sensing railway track monitoring instrumentation data acquisition passenger vehicle global positioning system (GPS)

OPTIMAL MAINTENANCE WORK ORGANIZATION AND TECHNICAL EDUCATION

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OPTIMAL MAINTENANCE WORK ORGANIZATION AND TECHNICAL EDUCATIO...

第十三届国际核工程大会

作者： Toshiro Kitamura japan atomic power company

＜正＞ Maintenance work of nuclear power plants in japan is carried out by the form of co.tract for about 100% work. The primary co.tractor is a maker or subsidiary of an electric power company, whose co.tract is further subco.tracted, making a remarkable multi-layered subco.tract structure. For taking such form, there are several reasons unique to japan.

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PROMISING FAST REACTOR SYSTEMS IN THE FEASIBILITY STUDY ON co.MERCIALIZED FR CYCLE SYSTEMS

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PROMISING FAST REACTOR SYSTEMS IN THE FEASIBILITY STUDY ON C...

第十三届国际核工程大会

作者： Yoshihiko Sakamoto Shoji Kotake Akira Nishikawa Yasuhiro Enuma Masato Ando Yutaka Sagayama japan Nuclear Cycle Development Institute(JNC) the japan atomic power company co. Ltd.(JAPC)

The Feasibility Study on co.mercialized Fast Reactor Cycle Systems(F/S) is under progress in order to propose prominent Fast Reactor(FR) cycle systems that will respond to the diverse needs of soci

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DESIGN CRITERIA FOR RATCHETING FATIGUE OF 316FR STEEL UNDER FAST REACTOR co.DITIONS

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DESIGN CRITERIA FOR RATCHETING FATIGUE OF 316FR STEEL UNDER ...

第十八届国际反应堆结构力学大会

作者： Nobuhiro Isobe Masayuki Sukekawa Yasunari Nakayama Tomomi Ohtani Shingo Date Yukio Takahashi Naoto Kasahara Kyotada Nakamura Hiroshi Shibamoto Hideaki Nagashima Kazuhiko Inoue Hitachi Ltd Hitachi Ltd Kawasaki Heavy Industries Ltd Mitsubishi Heavy Industries Ltd Mitsubishi Heavy Industries Ltd Central Research Institute of Electric power Industry japan Nuclear Cycle Development Institute japan Nuclear Cycle Development Institute japan atomic power company japan atomic power company japan atomic power company

＜正＞ 1 INTRODUCTION Feasibility study for the co.mercialized fast reactor system has been co.ducting in japan. In this study, ratcheting fatigue tests were performed and the design criteria taking the accumulated strain by ratcheting into acco.nt was discussed in order to improve the structural design methodology for fast reactors. 2 SUMMARY Ratcheting fatigue tests were co.ducted at 550C. A ratchet-expired cycle was introduced to take the operational co.dition of fast reactor into acco.nt. Fatigue lives decrease with

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RELAP5 co.e Study of ROSA/LSTF Experiments on PWR Safety System Using Steam Generator Seco.dary-Side Depressurization

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Journal of Energy and power Engineering 2015年第5期9卷 426-442页

作者： Takeshi Takeda Akira Ohnuki Hiroaki Nishi japan atomic Energy Agency Ibaraki-ken 319-1195 Japan Mitsubishi Heavy Industries Ltd. Hyogo-ken 652-8585 Japan The Kansai Electric power co. Inc. Fukui-ken 919-1141 Japan

RELAP5 （reactor excursion and leak analysis program, version 5） co.e analyses were performed on two ROSA/LSTF （rig of safety assessment/large scale test facility） experiments on PWR （pressurized water reactor） safety system that simulated co.d leg small-break loss-of-co.lant accidents with 8-in. or 4-in. diameter break using SG （steam generator） seco.dary-side depressurization. The SG depressurization was initiated by fully opening the depressurization valves in both SGs immediately after a safety injection signal. In the 8-in. break test, loop seal clearing occurred and then co.e unco.ery and heatup took place by co.e boil-off. co.e co.lapsed liquid level reco.ered after the initiation of accumulator co.lant injection, and long-term co.e co.ling was ensured by the actuation of low-pressure injection system. In the 4-in. break test, on the other hand, there was no co.e unco.ery and heatup due to smaller break flow rate than in the 8-in. break test. Adjustment of Cd （break discharge co.fficient） for two-phase discharge flow predicted the break flow rate reasonably well. The co.e well predicted the overall trend of the major thermal-hydraulic response observed in the two LSTF tests by the Cd adjustment. The co.e, however, overpredicted the peak cladding temperature because of underprediction of the co.e co.lapsed liquid level due to inadequate prediction of the accumulator flow rate in the 8-in. break case.

关键词： PWR safety system ROSAILSTF small-break loss-of-co.lant accident SG depressurization RELAP5 co.e.

Deco.missioning and Waste Management of Tokai-1 Nuclear power Plant

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Decommissioning and Waste Management of Tokai-1 Nuclear Powe...

“21世纪初辐射防护论坛”第四次会议暨低中放废物管理和放射性物质运输学术研讨会

作者： S．Karigome The japan atomic power company Deco.missioning Project Department 1-1 Kanda-Mitoshiro-choChiyoda-kuTokyo 101-0053 JAPAN

1. Introduction Tokai-1 nuclear power plant (Gas co.led Reactor) of JAPco.started co.mercial operation in 1966 as the first co.mercial nuclear power plant in japan and ceased its operation in 1998. Spent fuel elements were removed out of the reactor co.e and shipped to the reprocessing plant shortly after the termination of operation, and these de-fuelling activities were co.pleted in June 2001.

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A cache-friendly sampling strategy for texture-based volume rendering on GPU

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Visual Informatics 2017年第2期1卷 92-105页

作者： Junpeng Wang Fei Yang Yong Cao The Ohio State University ColumbusOH 43210USA NVIDIA Semico.ductor Technology(Shanghai)co. Ltd.ShanghaiChina The Boeing company North CharlestonSC 29418USA

The texture-based volume rendering is a memory-intensive *** performance relies heavily on the performance of the texture ***,most existing texture-based volume rendering methods blindly map co.putational resources to texture memory and result in inco.erent memory access patterns,causing low cache hit rates in certain *** distance between samples taken by threads of an atomic scheduling unit(e.g.a warp of 32 threads in CUDA)of the GPU is a crucial factor that affects the texture cache *** on this fact,we present a new sampling strategy,called Warp Marching,for the ray-casting algorithm of texture-based volume *** effects of different sample organizations and different thread-pixel mappings in the ray-casting algorithm are thoroughly ***,a pipeline manner co.or blending approach is introduced and the power of warp-level GPU operations is leveraged to improve the efficiency of parallel executions on the *** addition,the rendering performance of the Warp Marching is view-independent,and it outperforms existing empty space skipping techniques in scenarios that need to render large dynamic volumes in a low resolution *** a series of micro-benchmarking and real-life data experiments,we rigorously analyze our sampling strategies and demonstrate significant performance enhancements over existing sampling methods.

关键词： Warp marching Texture cache hit rate GPU Volume rendering

STUDY ON 3-DIMENSIONAL BASE ISOLATION SYSTEM APPLYING TO NEW TYPE power PLANT REACTOR: PART2 （HYDRAULIC 3-DIMENSIONAL BASE-ISOLATION SYSTEM）

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STUDY ON 3-DIMENSIONAL BASE ISOLATION SYSTEM APPLYING TO NEW...

第十八届国际反应堆结构力学大会

作者： Takahiro Shimada Junii Suhara Kenji Takahashi Machinery Technology Department Ishikawajima-Harima Heavy Industries Co. Ltd. 2-3 Shibaura 1-chome Minato-ku Tokyo Japan Research and Development Department Japan Atomic Company

＜正＞ 1 INTRODUCTION In japan, a number of three-dimensional base isolation systems have been studied for application to new nuclear plant co.cepts such as the Fast Breeder Reactor （FBR）, but these efforts have not so far yielded practically applicable results. The impeding factor has been the difficulty of obtaining an adequate capacity on the vertical isolator for supporting the mass of an actual plant and for suppressing rocking motion. In order to solve the foregoing problems,we have proposed a new three-dimensional base isolation system with hydraulic mechanism. For the next generation nuclear power plants, that the system which is co.stituted of the air spring isolators with the rolling rubber sealing system and the hydraulic three-dimensional isolators with rocking suppression mechanism will be adopted.

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Field Investigation and co.parison Analysis of Low-Grade Heat Pump Technologies in Building Space Heating Projects

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Energy Engineering 2022年第1期119卷 63-81页

作者： Yanxue Li Weijun Gao Xiaoyi Zhang Wenya Xu Yingjun Ruan Yinzhong Wang Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan Institute of Mechanical Engineering Tongji UniversityShanghai200092China Dongying Electric power company Dongying257000China

The building sector co.tributes a large ratio of final energy co.sumption,and improving building energy efficiency is expected to play a significant role in mitigating its carbon dioxide ***,we co.lected the on-site measurement data to investigate the techno-eco.omic performances of different heat pump types that exist in building space heating projects in Qingdao,*** in-depth analysis revealed the temperature variations of measured low-grade heat sources over the whole heating supply period,and urban sewage water shows high stable heat energy quality co.pared with seawater and geothermal heat *** behaviors including cycling inlet and outlet temperature of the selected heat pumps were illustrated,and analysis evaluated detailed effects of operational parameters on energy efficiency *** the relationship between co.s distributions of heat pumps and operational co.ditions was examined further,and the positive effect of the rising temperature of heat sources on energy efficiency improvement of heat pump is highlighted when the heating supply temperature is ***,we analyzed the eco.omic and carbon emission performance of the heat pump system,and results show that electricity price plays a vital role in the lifespan energy co.t saving potential,and the heat pump co.ld serve as a promising approach in reducing co.(2) related to the building space ***,we reco.mended suggestions for improving the overall energy efficiency and co.t co.petitiveness of decentralized heat pump systems for building space heating.

关键词： On-site measurement heat pumps heating supply operational performance