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Development of a MWDC prototype of the CSR external-target experiment

NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-14页

作者： He, Zhou-Bo Qin, zhi Ma, Peng Yang, He-Run Wei, Xiang-Lun Lu, Chen-Gui Wen, Xiang-Jie Zhang, Xiu-Ling Chen, Tao Li, zhi-Jie Yang, Yuan-Sheng Zhan, Mei-Qiang Liu, Can-Wen Li, Meng Qiu, Tian-Li Gong, Yi-Wei Huang, Xin-Jie Yin, xiao-Hao He, zhi-Xuan Zhang, Jun-Wei Zou, Hai-Chuan Fu, Sheng-Wei Guo, Dong Yan, Jun-Wei Cao, Zhe Deng, zhi Kong, Jie xiao, zhi-gang Hu, Rong-Jiang Duan, Li-Min Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China Tsinghua Univ Dept Phys Beijing 100084 Peoples R China Univ Sci & Technol China Hefei 230026 Peoples R China Sichuan Univ Inst Nucl Sci & Technol Key Lab Radiat Phys & Technol Minist Educ Chengdu 610064 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China North China Univ Water Resources & Elect Power Zhengzhou 450000 Peoples R China

The cooling storage ring (CSR) external-target experiment (CEE) is a spectrometer used in construction to study the properties of nuclear matter in high-baryon density regions at the Heavy-Ion Research Facility in Lanzhou (HIRFL). This study presents the design, simulation, manufacturing, and testing of a half-size prototype of a multi-wire drift chamber (MWDC) for the CEE. First, the performance of the MWDC connected to homemade electronics was simulated. The results demonstrated that an energy resolution of 18.5% % for 5.9-keV X-rays and a position resolution of 194 mu m for protons can be achieved by the current design. Because the size of the largest MWDC reached 176 cm x 314 cm, a set of 98 cm x 98 cm prototypes was built using the new techniques. The positioning accuracy of the anode wires in this prototype is better than 20 mu m. After optimization, using commercially available electronics, the prototype can achieved an energy resolution of 19.7% % for a Fe-55 X-ray source. The CEE-MWDC detector and electronics were simultaneously tested. An energy resolution of 22% % was achieved for the Fe-55 source; the track residuals were approximately 330 mu m for the cosmic rays. The results demonstrate that the current design and techniques meet the requirements of the CEE-MWDC array.

关键词： CEE MWDC Garfield plus plus Fe-55 source Position resolution DRIFT CHAMBER HIRFL-CSR

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Phase Synchronization of Coupled Rossler Oscillators： Amplitude Effect

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Communications in Theoretical Physics 2007年第2期47卷 265-269页

作者： LI xiao-Wen ZHENG zhi-gang Department of Physics and the Beijing-Hong-Kong-Singapore Joint Center for Nonlinear and Complex Systems （Beijing） Beijing Normal University Beijing 100875 China

Phase synchronization of two linearly coupled Rossler oscillators with parameter misfits is explored. It is found that depending on parameter mismatches, the synchronization of phases exhibits different manners. The synchronization regime can be divided into three regimes. For small mismatches, the amplitude-insensitive regime gives the phase-dominant synchronization; When the parameter misfit increases, the amplitudes and phases of oscillators are correlated） and the amplitudes will dominate the synchronous dynamics for very large mismatches. The lag time among phases exhibits a power law when phase synchronization is achieved.

关键词： phase synchronization amplitude eiiect

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Estimation of Aqueous Solubility (-lgS_w) of All Polychlorinated Biphenyl (PCB) Congeners by Density Functional Theory and Position of Cl Substitution (NPCS) Method

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Chinese Journal of Structural Chemistry 2007年第5期26卷 519-528页

作者： WEI xiao-Yan GE zhi-gang WANG Zun-Yao XU Jiao School of Biological and Chemical Engineering Jiaxing University Jiaxing Zhejiang 314001 China

Optimization calculations of 209 polychlorinated biphenyls （PCBs） were carried out at the B3LYP/6-31G^＊ level. It was found that there is significant correlation between the Cl substitution position and some structural parameters. Consequently, Cl substitution positions were taken as theoretical descriptors to establish a novel QSPR model for predicting –lgSw of all PCB congeners. The model achieved in this work contains four variables, of which r^2 = 0.9527, q^2 = 0.9490 and SD = 0.25 with large t values. In addition, the variation inflation factors （VIFs） of variables in this model are all less than 5.0, suggesting high accuracy of the –lgSw predicting model. And the results of cross-validation test and method validation also show that the model exhibits optimum stability and better predictive capability than that from the AM1 method.

关键词： polychlorinated biphenyls (PCBs) aqueous solubility (-lgSw) quantitativestructure-property relationship (QSPR) position of Cl substitution (NPCS) method

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Numerical simulation of protection range in exploiting the upper protective layer with a bow pseudo-incline technique

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Mining Science and Technology 2009年第1期19卷 58-64页

作者： HU Guo-zhong WANG Hong-tu LI xiao-hong FAN xiao-gang YUAN zhi-gang Key Lab for Exploitation of China Southwestern Resources ＆ Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400030 China

The developing processes of stress and deformation fields of a protected layer after mining an upper-protective layer with a bow pseudo-incline technique were simulated to locate the protection region. The pressure relief of the protected layer was analyzed after mining the upper-protective layer. The pressure relief angle along the strike and incline were located according to the roles of protection of the deformation and stress pressure-relief of the protective layer after mining. This results show that the upper-protective layer with the bow pseudo-incline technique have an upper and downside pressure relief angle of 85 and 68 degrees respectively; the distribution of strike pressure relief angles along the pseudo-incline working face is uneven and their values range from 38.3 to 51 degrees. The pressure relief angle of the inclined middle location was the largest. The distribution of the protection region of the upper-protective layer with the bow pseudo-incline teelmique located by practical tests and numerical simulation is essentially consistent, compared with the results obtained by these methods.

关键词： bow pseudo-incline technique upper-protective layer protection region 3D numerical simulation

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Rapid and efficient synthesis of new chiral aromatic amide molecular tweezers under solvent-free conditions using microwave

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Chinese Chemical Letters 2009年第4期20卷 397-400页

作者： xiao Xiang Zhao zhi gang Zhao Xing Li Liu Xiu Ming Wu College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China

An efficient and simple method for the synthesis of new chiral aromatic amide molecular tweezers by irradiation with microwave under solvent-free conditions has been developed. Its main advantages are short reaction t... 详细信息

关键词： Molecular tweezer Aromatic amide Microwave irradiation Molecular recognition

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Revolution in thermoelectric cooling using PbSe thermoelectrics by grid plainification

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Science China Materials 2024年第5期67卷 1672-1673页

作者： xiao-Lei Shi Qingfeng Liu zhi-gang Chen School of Chemistry and Physics ARC Research Hub in Zero-emission Power Generation for Carbon Neutralityand Centre for Materials ScienceQueensland University of TechnologyBrisbaneQueensland4000Australia State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing211816China

Thermoelectric materials and devices enable direct conversion between heat and electricity,holding potential applications in thermoelectric power generation,localized cooling,and electronic thermal management[1].Howev... 详细信息

关键词： enable thermoelectric constrained

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Gas seepage equation of deep mined coal seams and its application

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Journal of China University of Mining and Technology 2008年第4期18卷 483-487页

作者： HU Guo-zhong WANG Hong-tu TAN Hai-xiang FAN xiao-gang YUAN zhi-gang Key Lab for Exploitation of China Southwestern Resources ＆ Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400030 China

In order to obtain a gas seepage law of deep mined coal seams, according to the properties of coalbed methane seepage in in-situ stress and geothermal temperature fields, the gas seepage equation of deep mined coal seams with the Klinkenberg effect was obtained by confirming the coatbed methane permeability in in-situ stress and geothermal temperature fields. Aimed at the condition in which the coal seams have or do not have an outcrop and outlet on the ground, the application of the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields on the gas pressure calculation of deep mined coal seams was investigated. The comparison between calculated and measured results indicates that the calculation method of gas pressure, based on the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields can accu- rately be identical with the measured values and theoretically perfect the calculation method of gas pressure of deep mined coal seams.

关键词： deep mining in-situ stress field geothermal temperature field gas seepage equation of coal seam gas pressure

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Relaxed resource advance reservation policy in grid computing

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The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 108-113页

作者： xiao Peng HU zhi-gang School of Information Science and Engineering,Central South University,Changsha 410083,China [a]School of Information Science and Engineering Central South University Changsha 410083 China

The advance reservation technique has been widely applied in many grid systems to provide end-to-end quality of service （QoS）. However, it will result in low resource utilization rate and high rejection rate when the reservation rate is high. To mitigate these negative effects brought about by advance reservation, a relaxed advance reservation policy is proposed, which allows accepting new reservation requests that overlap the existing reservations under certain conditions. Both the benefits and the risks of the proposed policy are presented theoretically. The experimental results show that the policy can achieve a higher resource utilization rate and lower rejection rate compared to the conventional reservation policy and backfilling technique. In addition, the policy shows better adaptation when the grid systems are in the presence of a high reservation rate.

关键词： grid computing advance reservation reservation violation computing economy

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UVB-irradiated human keratinocytes and interleukin-1■ indirectly increase MAP kinase/AP-1 activation and MMP-1 production in UVA-irradiated dermal fibroblasts

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Chinese Medical Journal 2006年第10期 827-831页

作者： WANG xiao-yong BI zhi-gang Department of Dermatology First Affiliated Hospital of NanjingMedical University Nanjing 210029 China

Background Solar ultraviolet （UV） irradiation induces the production of matrix metalloproteinases （MMPs） by activating cellular signalling transduction pathways. MMPs are responsible for the degradation and/or inhibition of synthesis of collagenous extracellular matrix in connective tissues. We mimicked the action of environmental ultraviolet on skin and investigated the effects of UVB-irradiated human keratinocytes HaCaT and IL-1α on mitogen activated protein （MAP） kinase activation, c-Jun and c-Fos （AP- 1 is composed of Jun and Fos proteins） mRNA expression and MMP-1 production in UVA-irradiated dermal fibroblasts.

关键词： ultraviolet keratinocytes fibroblasts interleukin-1α matrix metalloproteinase-1

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焊接接头应力强度因子计算公式的改进

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工程力学 2012年第10期29卷 225-231页

作者：彭洋童乐为 ZHAO xiao-ling xiao zhi-gang 同济大学建筑工程系上海200092 Monash大学土木工程系澳大利亚 Monash大学应用科学和工程系澳大利亚

针对焊接接头的半椭圆表面裂纹的应力强度因子SIF的计算公式,该文介绍了目前常用的Newman-Raju-Maddox模型和Yamada-Hirt-Albert模型以及两种模型的异同性。经过分析,发现Yamada-Hirt-Albert模型存在不足,其SIF公式难以合理地计算均匀... 详细信息

针对焊接接头的半椭圆表面裂纹的应力强度因子SIF的计算公式,该文介绍了目前常用的Newman-Raju-Maddox模型和Yamada-Hirt-Albert模型以及两种模型的异同性。经过分析,发现Yamada-Hirt-Albert模型存在不足,其SIF公式难以合理地计算均匀受拉状态下的SIF值。在对现有文献中研究数据的分析基础上,改进了Yamada-Hirt-Albert模型,提出了新的SIF计算公式。经与Benchmark数据以及其他国外试验结果的比较,验证了该文所提出的SIF改进公式具有更好的可靠性。

关键词：线弹性断裂力学焊接接头半椭圆表面裂纹应力强度因子计算公式

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