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Enhancement of M1 Transition Rates at High Spin in ^(90)Mo

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Chinese Physics Letters 2001年第4期18卷 505-507页

作者： wu xiao-guang LI guang-Sheng PENG Zhao-Hua WEN Shu-Xian HAN guang-Bing LI Cheng-Po LU Shao-Jun wu Shao-Yong YUAN Guan-Jun YANG Chun-Xiang China Institute of Atomic Energy Beijing 102413

High spin states in ^(90)Mo have been populated through the ^(59)Co (^(35)Cl,2p2n) 90Mo reaction at beam energy of 116 MeV. Level lifetimes of the positive-parity decay sequence are measured by using the Doppler shift attenuation method. It is observed that the M1 transition strengths show a substantial enhancement at high spin. This behaviour may be related to occupation of high Ω orbitals by a pair of g9/2 protons. A deformed shape with oblate is suggested above the 13^(+) state.

关键词： method. state. Transition

Structure of High Spin States in ^(87)Zr

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Chinese Physics Letters 1999年第5期16卷 345-346页

作者： ZHAO guang-yi LI guang-sheng wu xiao-guang LIU Xiang-an WEN Shu-xian LU Jing-bin YUAN Guan-jun YANG Chun-xiang China Institute of Atomic Energy Beijing 102413 Department of Physics Jilin UniversityChangchu 130023

Structure of high spin states in ^(87)Zr was studied through the reaction ^(59)Co(^(32)S,3pn)^(87)Zr at a beam energy of 118 MeV using in-beam γ-ray spectroscopic *** of γ-γ coincidence was performed,and directional correlation orientation ratios of someγrays were *** level scheme of ^(87)Zr was established up to spin(37/2^(+))and(43/2^(-)).Many previously unknown states have been *** with neighboring isotones indicates that the effect of neutron on nuclear structure property is predominant compared to proton,and there is a tendency of reduction in band crossing frequency with increasing proton number.

关键词： method. Structure beam

Shape Evolution in Rotating ^(178)Os

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Chinese Physics Letters 2011年第11期28卷 79-82页

作者： HAO Xin ZHU Li-Hua wu xiao-guang HE Chuang-Ye ZHENG Yun LI Li-Hua SUN Hui-Bin LI guang-Sheng College of Physics and Technology Shenzhen UniversityShenzhen 518060 School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191 China Institute of Atomic Energy Beijing 102413

In order to investigate the evolution of X(5)in rotating ^(178)Os,an experiment populating ^(178)Os via the fusion evaporation reaction 154Sm(^(29)Si,5n)^(178)Os was performed at the HI-13 tandem accelerator at the China Institute of Atomic Energy(CIAE).Lifetimes of excited states above 8^(+)in the yrast band in 178Os have been measured using the Doppler shift attenuation *** above 12^(+)states were measured for the first *** deduced transitional quadruple moments(Qt),together with the previous data using the recoil distance Doppler shift(RDDS)method are compared with theoretical calculations based on the X(5)model and the interaction Boson model(IBM).Above the 10^(+)states,the Qt values fit well with the X(5)*** present result suggests that the shape of a nucleus ^(178)Os keeps X(5)critical point symmetry as spin increases to at least 14^(+).The shape change of 178Os with spin increasing is similar to that of ^(176)Os.

关键词： method states

Observation of Decay of ^(92)Rh

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Chinese Physics Letters 1999年第1期16卷 18-19页

作者： ZHOU Shu-hua LI Zhi-hong LI xiao-mei TIAN Wei wu xiao-guang LI Jing-wen JIANG Li-yang China Institute of Atomic Energy Beijing 102413

By means of beam chopping and γ-γ coincidence technique,the in-beam γ-rays and decay γ-rays of the 15OMeV^(40)Ca+^(58)Ni reaction products have been *** four strongest transition γ-rays of ^(92)Rh have been clearly *** decay γ-rays of ^(92)Rh have been identified for the first *** spin and parity of 6^(+) are tentatively assigned to the ground state of ^(92)*** of the decay scheme of 92Rh is proposed.

关键词： decay beam coincidence

The Research on CAD/CAPP Integrated System for Welding Boxlike Parts Made of Plate

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厦门大学学报（自然科学版） 2002年第S1期41卷 131-132页

作者： wu xiao-guang, ZHANG Guo-zhen, MEI Shun-qi, wu Shi-lin (wuhan Institute of Science and Technology, wuhan 430073, China)

By adopting the parameterized designing method of f ea ture assembled and feature unit, for the feature of non-conventional type parts , such as welding box and bearer, by use of Visual C++ and AutoCAD a s soft tools, the system can successfully carry out the basic function of featur e assembled, the processing of two-dimensional figure, the building of three-d imensional feature, the automatic producing of technical papers, and so on. The thoughts and design methods of this system can be served as the preference to CA D/CAPP integrated for othernon-conventional type parts. For non-conventional parts, its feature is too much, so the parameter is much. By adopting interactive entry for graphic parameter, under the control of main c ontrol module, through inputting the feature parameter and calling the feature g raphic unit, the function for modeling is completed. To reduce input of feature parameter, the description of position feature is adopted in the feature descrip tion of non-conventional parts, that is, fix position is constraint through str ucture and dimension of non-conventional parts. In such a manner, the assembled process has been transformed the coordinate conversion process, and this is ver y important in the production of three-dimensional graphics. In the one hand, b y calling the feature of parts in the library of feature-graphic unit, the two -dimensional DXF file and three-dimensional SCR file are automatically produce d in AutoCAD. On the other hand, by calling the rules and standard operational s equences in the technologic knowledge base, through inferring of inference engin e, the assembled sequence of non-conventional parts and welding sequences are a utomatically produced. The two aspects constitute overall design philosophy for system. So the CAD/CAPP integration of feature-assembled for non-conventio nal parts are completed. The principle of dividing feature is based on the thought of group technology, t hat is, according to the function fe

关键词： non-conventional type parts feature-assembled parameterized designing CAD/CAPP

Underwater vehicle sonar self-noise prediction based on genetic algorithms and neural network

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Journal of Marine Science and Application 2006年第2期5卷 36-41页

作者： wu xiao-guang SHI Zhong-kun College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China China Ship Development and Design Center Wuhan 430064 China

The factors that influence underwater vehicle sonar self-noise are analyzed, and genetic algorithms and a back propagation (BP) neural network are combined to predict underwater vehicle sonar self-noise. The experimental results demonstrate that underwater vehicle sonar self-noise can be predicted accurately by a GA-BP neural network that is based on actual underwater vehicle sonar data.

关键词： sonar self-noise back propagation (BP) neural network genetic algorithms

Observation of Low-Lying and Linking Transitions in ^(124)Cs

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Chinese Physics Letters 2001年第1期18卷 21-23页

作者： LU Jing-Bin LIU Yun-Zuo YIN Li-Chang ZHANG Fan wu xiao-guang WEN Shu-Xian LI guang-Sheng YANG Chun-Xiang Department of Physics Jilin UniversityChangchun 130023 China Institute of Atomic Energy Beijing 102413

The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number of low-lying states are *** level states in theπh_(11/2)νg_(7/2) side band are extended down to lower spin by one *** level energies and spins in the rotational bands are determined through the establishment of various connections,which confirm the spin assignment of the yrast band in ^(124)Cs based on excitation energy *** is revealed that with the present spin assignment,theπh_(11/2)νg_(7/2) side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.

关键词： assignment Transition

High Spin States and Signature Inversion in ^(84)Rb

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Chinese Physics Letters 1999年第7期16卷 487-489页

作者： HAN guang-bing WEN Shu-xian wu xiao-guang LIU Xiang-an LI guang-sheng YUAN Guan-jun PENG Zhao-hua WENG Pei-kun YANG Chun-xiang MA Ying-jun LU Jing-bin China Institute of Atomic Energy Beijing 102413 Department of Physics Jilin UniversityChangchun 130023

High-spin states in^(84)Rb have been studied by using the^(70)Zn(^(18)O,p3n)^(84)Rb reaction at a beam energy of 75 ***γ-γcoincidence,excitation function and ratios for directional correlation of oriented states were performed.A new level scheme was established in which the positive and negative parity bands have been extended up to 17^(+)and 17^(-)with excitation energy about *** signature splitting and signature inversion of the positive parity yrast bands were observed and are discussed.

关键词： excitation bands signature

Studies on BN rats model to determine the potential allergenicity of proteins from genetically modified foods

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World Journal of Gastroenterology 2005年第34期11卷 5381-5384页

作者： Xu-Dong Jia Ning Li Yong-Ning wu xiao-guang Yang National Institute for Nutrition and Food Safety Chinese Center for Disease Control and Prevention 29 Nanwei Road Beijing 100050China

AIM： To develop a Brown Norway （BN） rat model to determine the potential allergenicity of novel proteins in genetically modified food. METHODS： The allergenicity of different proteins were compared, including ovalbumin （OVA）, a potent respiratory and food allergen, bovine serum albumin （BSA）, a protein that is considered to have a lesser allergenic potential, and potato acid phosphatase （PAP）, a non-allergenic protein when administered to BN rats via different routes of exposure （intraperitoneally or by gavage）. IgG and IgE antibody responses were determined by ELISA and PEA, respectively. An immunoassay kit was used to determine the plasma histamine level. In addition, possible systemic effect of allergens was investigated by monitoring blood pressure. RESULTS： OVA provoked very vigorous protein-specific IgG and IgE responses, low grade protein-specific IgG and IgE responses were elicited by BSA, while by neither route did PAP elicit anything. In either routes of exposure, plasma histamine level in BN rats sensitized with OVA was higher than that of BSA or PAP. In addition, an oral challenge with BSA and PAP did not induce any effect on blood pressure, while a temporary drop in systolic blood pressure in few animals of each routes of exposure was found by an oral challenge with OVA. CONCLUSION： BN rat model might be a useful and predictive animal model to study the potential allergenicity of novel food proteins.

关键词： Animal model Food protein Allergenicity