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The high-energy particle package onboard CSES

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Radiation Detection Technology and Methods 2019年第3期3卷 45-55页

作者： x.Q.Li y.B.xu Z.H.An x.H.Liang P.Wang x.y.Zhao H.y.Wang H.Lu y.Q.Ma x.H.shen x.y.Wen H.Wang D.L.Zhang F.Shi W.x.Peng M.Gao x.x.yu J.Z.Wang y.J.Zhang J.L.Zhang J.Zhang H.x.Li J.R.Zeng y.F.Nan Institute of High Energy Physics CASBeijing 100049China Institute of Crustal Dynamics CEABeijing 100085China Nanchang Hangkong University Nanchang 330063China Northwest University Xi’an 710127China

Introduction The China Seismo-Electromagnetic Satellite(CSES)aims to monitor space electromagnetic fields,ionospheric plasma,high-energy charged particles and other features of the global space *** high-energy particle package(HEPP),which can effectively detect the energy spectrum,flux and pitch angle distribution of space electrons and protons,and soft x-ray emission from solar flares,is one of the main payloads of *** and methods In this study,we designed,developed and calibrated the high-energy particle package and launched it into orbit with *** consists of the high-energy detector(HEPP-H),the low-energy detector(HEPP-L),and the solar x-ray monitor(HEPP-x).The three sub-detectors mainly use silicon detector and crystal calorimeter detection *** launching,we calibrated the three sub-detectors in detail by using radiation source and accelerator *** All the three sub-detectors have good energy *** launching into orbit,the space energetic particles and x-ray distribution detected by HEPP are consistent with *** performance indices of the detector reach the advanced level of the same kind of detector in the *** HEPP has a wide energy detection range,good energy resolution and high angular resolution ability for electrons and *** will play an important role in the study of space particle response and space physics of seismic activity.

关键词： ZH-1 CSES HEPP High-energy particle Radiation belt

“y型柱”大柱跨、大层高车站结构受力特性研究

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山西建筑 2025年第1期51卷 60-64页

作者：沈飞西南交通大学四川成都610031

伴随着国内城市轨道交通的高速建设,我们的规划设计对地铁车站的空间形式以及其区间隧道断面的结构形式提出了更多的新需要,为了满足居民对城市地下结构空间高利用率、环境高观赏性等多方位的需求,大跨度、高断面、宽柱距、异形柱等各... 详细信息

伴随着国内城市轨道交通的高速建设,我们的规划设计对地铁车站的空间形式以及其区间隧道断面的结构形式提出了更多的新需要,为了满足居民对城市地下结构空间高利用率、环境高观赏性等多方位的需求,大跨度、高断面、宽柱距、异形柱等各种独具特色的地下结构也陆续出现。相比于传统立柱,设置大跨度y型柱的车站结构成为了一种全新的结构,相比于传统车站结构,其所能提供的实际空间宽敞得多。为了研究这种采用新型结构的地铁车站的受力特性,以广州地铁彩虹桥站为工程案例,使用MIDAS软件建立三维模型并划分实网格,采用FLAC3D软件重点分析了车站梁沉降和应力,y型柱的应力变化规律。

关键词：大跨度地铁车站 y型柱有限差分元

Feature of thermohaline circulation in two-layer conceptual model based on energy constraint

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Science China Earth Sciences 2015年第7期58卷 1397-1403页

作者： shen yang GUAN yuPing College of Science Liaoning University of Technology State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences

The assertion that the thermohaline circulation(THC)is driven and sustained by mechanical energy has been increasingly *** simplest conceptual model describing the THC is the Stommel two-box *** the vertical stratification in the real ocean,layered models were designed and *** this research,using a two-layer conceptual model based on energy constraint,we studied basic features of thermal-mode and saline-mode *** focused on the effects of freshwater flux and mixing energy on the intensity and multiple equilibrium states of the *** results show that more important than affecting the THC intensity,both the decrease of freshwater flux and increase of mixing energy can lead to an"abrupt transition"in the THC from a stable saline to a stable thermal mode,which further develops the THC energy theory.

关键词： thermohaline circulation two-layer model mixing energy freshwater flux equilibrium state

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Mapping non-laminar proton acceleration in laser-driven target normal sheath field

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High Power Laser Science and Engineering 2022年第1期10卷 10-16页

作者： C.y.Qin H.Zhang S.Li S.H.Zhai A.x.Li J.y.Qian J.y.Gui F.x.Wu Z.x.Zhang y.xu x.y.Liang y.x.Leng B.F.shen L.L.Ji R.x.Li State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China Department of Physics Shanghai Normal UniversityShanghai 200234China ShanghaiTech University Shanghai 201210China

We report on experimental observation of non-laminar proton acceleration modulated by a strong magnetic field in laser irradiating micrometer aluminum *** results illustrate the coexistence of ring-like and filamentation *** implement the knife edge method into the radiochromic film detector to map the accelerated beams,measuring a source size of 30-110μm for protons of more than 5 *** diagnosis reveals that the ring-like profile originates from low-energy protons far off the axis whereas the filamentation is from the near-axis high-energy protons,exhibiting non-laminar ***-in-cell simulations reproduced the experimental results,showing that the short-term magnetic turbulence via Weibel instability and the long-term quasi-static annular magnetic field by the streaming electric current account for the measured beam *** work provides direct mapping of laser-driven proton sources in the space-energy domain and reveals the non-laminar beam evolution at featured time scales.

关键词： knife-edge technique laser-plasma interaction non-laminar proton source target normal sheath acceleration Weibel instability

Comparing material wastage levels between conventional in-situ and prefabrication construction in Hong Kong

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Journal of Harbin Institute of Technology(New Series) 2004年第5期11卷 548-551页

作者： Vivian W yTam C M Tam L y shen Dept. of Building and Construction City University of Hong Kong Hong Kong ChinaDept. of Building and Construction City University of Hong Kong Hong Kong ChinaDept. of Building and Construction City University of Hong Kong Hong Kong China

Generation of construction wastes constitutes a major impact to the environment. Studies have been directed toward reducing wastes of the various construction processes. However, contractors in Hong Kong are rather conservative and lack motivation to develop new technology for waste minimization. This paper examines the benefits of using prefabrication in reducing material wastage levels for some traditional in-situ trades such as concreting, rebar fixing, bricklaying, drywall, plastering, screeding and tiling in Hong Kong. By measuring thirty construction projects, it is been found that waste levels of all major construction trades can be effectively reduced. This is particularly significant in the trade of plastering where 100% saving can be achieved after adopting prefabrication. The standardized design of the building can also be useful in the adoption of prefabrication for private housing projects.

关键词： prefabrication conventional in-situ trades material wastage environment

TENSILE STRESS RELAxATION OF TURBINE BOLT STEELS AT HIGH TEMPERATURE

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 542-547页

作者： G.Q.Jia H.W.shen y.M.Zhu Metallurgical Department. Shanghai Turbine Company Ltd. Shanghai 200240 ChinaMetallurgical Department. Shanghai Turbine Company Ltd. Shanghai 200240 ChinaMetallurgical Department. Shanghai Turbine Company Ltd. Shanghai 200240 China

Stress relaxation behavior of two turbine bolt steels was evaluated by the manual-controlled tensile stress relaxation test (TSRT) at high temperature. First, feasibility and the procedure of the manual-controlled tensile stress relaxation test (TSRT) is discussed and carried out on a general creep testing machine. And then, the experimental results from such type of test were compared to the existing data provided by certain Laboratory U.K. Overall good agreement between the results of manual-controlled TSRT method and the existing data provides confidence in the use of the proposed method in practice. Finally, the experimental results of turbine bolt steels from TSRT were compared with that of bending test. It is observed that great difference exists between the results from two different type stress relaxation tests. It is therefore suggested that the results from TSRT method be adopted in turbine bolt design in engineering.

关键词： tensile stress-relaxation test bending stress-relaxation test turbine bolt steels

SyNTHESIS AND THERMAL STABILITy OF NANOCOMPOSITE nc-TiN/a-TiB_2 THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 307-312页

作者： y.H.Lu Z.F.Zhou P.Sit y.G.shen K.y.Li H.Chen DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina／／DepartmentofManufacturingEngineeringg~EngineeringManagementCityUniversityofHongKongKowloonHongKongChina DepartmentofManufacturingEngineering＆EngineeringManagement CityUniversityofHongKongKowloonHongKongChina DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina

Several nc-TiN/a-TiB2 thin films comprised of nanocrystalline (nc-) TiN and amor phous (a-) TiB2 phases were deposited on Si(100) at room temperature by reactive unbalanced dc magnetron sputtering, followed by vacuum annealed at 400, 600, 80 0 and 1000℃ for 1h, respectively. Effects of B content on microstructure, mecha nical behaviors and thermal microstructure stability have been investigated by x -ray diffraction (xRD), scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (xPS) and nanoindentation measurements. The results indicated that B addition greatly affected both microstructure and mechanical behavior of nc-Ti N/a-TiB2 thin films. With increasing B content the grain size decreased. A maxim um hardness value of about 33GPa was obtained at B content of about 19at.%. The improved mechanical properties of nc-TiN/a-TiB2 films with the addition of B int o TiN were attributed to their densified microstructure with development of fine grain size. Only addition of sufficient B could restrain grain growth during an nealing. High B content resulted in high microstructure stability. The crystalli zation of amorphous matrix occurred at about 800℃, forming TiB or TiB2 crystall ite, depending on B content. Before that no change in bonding configuration was found.

关键词： annealing boron reactive unbalanced dc magnetron sputtering ther mal stability nc-TiN/a-TiB2 thin film

COMPOSITION EFFECT ON DRy SLIDING WEAR BEHAVIORS OF Ti-B-N THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 300-306页

作者： P.Sit y.H.Lu H.Chen Z.F.Zhou y.G.shen K.y.Li DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina／／DepartmentofManufacturingEngineeringg：EngineeringManagementCityUniversityofHongKongKowloonHongKongChina DepartmentofManufacturingEngineering＆EngineeringManagement CityUniversityofHongKongKowloonHongKongChina

Friction and sliding wear behaviour of Ti-B-N coatings against AISI440C steel ba ll and WC-6wt%Co ball were studied by using pin-on-disk tribometer along with mi crostructure characterization using optical microscopy (OM), scanning electron m icroscopy (SEM) and x-ray photoelectron spectroscopy (xPS). It is shown that the wear resistance of film depended on the wear mechanism. In the case of AISI440C steel, adhesive wear were pre-dominant and the wear rate increased sharply to a maximum when N content reach ~38at.%. This might be related to the change of fi lm microstructure and phase configuration, so the least adhesive transfer of tri bo-film was observed. If WC-6wt%Co ball was used, less deformation wear debris w as observed, this was responsible for the rise of wear rate. Despite of differen t wear modes, friction coefficients in both cases were found to depend mainly on the formation and the amount of h-BN phase. Elemental analysis by energy disper sive spectroscopy (EDS) and x-ray photoelectron spectroscopy (xPS) revealed that oxygen participated in the wear behavior by reacting with films to form the deb ris comprised of various types of Ti oxide including TiO, TiO2 and Ti2O3 , which increased wear resistance.

关键词： dry sliding wear friction coefficient oxidation Ti-B-N wear

Inheritance of callus induction ability in rice anther culture

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Chinese Science Bulletin 1997年第14期42卷 1209-1211页

作者： He, P Chen, y shen, LS Lu, CF Zhu, LH Institute of Genetics Chinese Academy of Sciences Beijing China

DURING the last two decades, anther culture technique has been widely used in plant improve-ment including rice, wheat and maize. Recently, doubled haploid (DH) progenies derivedfrom anther culture have also been used in molecular mapping projects as permanent popula-tions. Some studies have revealed that the rice culturability is controlled by a few genetic fac-tors. xue suggested that it was an inheritable trait with additive gene effect. Wu

关键词： DH population callus induction frequency QTLs rice.