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| 1 | Pb isotope geochemistry of lead, zinc, gold and silver deposit clustered region, Liaodong rift zone,northeastern China显示文摘Pb isotopic analyses were reported for sulfide and hydrothermal carbonate minerals and marble of the Xiquegou lead-zinc, the Zhenzigou zinc-lead and the Gaojiapuzi silver deposits from the Qingchengzi ore field and the Beiwagou zinc-lead deposit in the west, Proterozoic Liaodong rift zone. Pb isotopic ratios of the marble from the Qingchengzi ore field range from 18.24 to 30.63 for 206 Pb/204Pb, 15.59 to 17.05 for207Pb/204Pb and 37.43 to 38.63 for 208Pb/204Pb. The marble gives a Pb-Pb isochron age of 1822±92 Ma, which is interpreted as the age of the metamorphism of the marble. Ore Pb, including Pb of sulfide and hydrothermal car- bonate minerals, from the Qingchengzi ore field shows limited variation with 206 Pb/204Pb=17.66- 17.96, 207 Pb/204Pb=15.60-15.74 and 208Pb/204Pb=37.94-38.60. In contrast, ore Pb from the Beiwagou deposit gives different Pb isotopic ratios with 206Pb/204Pb=15.68-15.81, 207 Pb/204Pb= 15.34-15.45 and 208Pb/204Pb=35.30-35.68. Pb of all deposits from the Liaodong rift zone is derived from the upper crust. Ore Pb of the Qingchengzi deposits is derived from a young upper crust. The model Th/U ratios of 4.40 to 4.74 for ore Pb are significantly different from that of 1.7 to 4.4 given by the marble of the Qingchengzi ore field, suggesting that marble is not the source of the ore Pb. Ore Pb of the Beiwagou deposit is extracted from its source and the deposit is formed at the Paleoproterozoic era. Different Pb isotopic ratios of the Qingchengzi ore field and the Beiwagou deposit are due to different ages of the deposits and suggest that the two types of deposits are derived from different sources and are possibly formed by different ore-forming processes. | CHEN Jiangfeng1, YU Gang1, XUE Chunji2, QIAN Hui1, HE Jianfeng1, XING Zhi1 & ZHANG Xun1 1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China 2. Department of Geology, Chang’an University, Xi’an 710054, China | 2005 | Science China Earth Sciences2005，48，4： | 11 |
| 2 | The Development of Leisure Agriculture Based on Characteristics of Land Resource Utilization显示文摘Based on analysis of geographical and location advantages of Qiaocheng District,we discussed characteristics of land utilization and local industry. In accordance with these characteristics,it is proposed to explore potential of farming land,speed up transfer of farming land in Qiaocheng District,and develop the leisure agriculture. | YANG Li 1 ,YU Zhong-xiang 1 ,MA Wei-peng 2 1. College of Economics and Management,Anhui Agricultural University,Hefei 236800,China 2. School of Earth Science and Resources, Chang’an University,Xi’an 710001,China | 2012 | Asian Agricultural Research2012，4，8： | 4 |
| 3 | The Effect of the Mixed External Donors on the Sequence Length Distribution of Polypropylene显示文摘 | Chang Hefei Ren Shitong Dang Xiaofei | 2013 | J Appl Polym Sci2013，129，3： | 1 |
| 4 | Study on the se- quence length distribution of polypropylene by the successive self-nucleation and annealing (SSA) calorimetric technique 显示文摘 | Chang Hefei Zhang Yu Ren Shitong | 2012 | Polym Chem2012，3，10： | 1 |
| 5 | Study on the Sequence Length Distribution of Polypropylene by the Successive Self-Nucleation and Annealing(SSA) Calorimetric Technique显示文摘 | Chang Hefei Zhang Yu Ren Shitong | 2012 | Polym Chem2012，3，10： | 1 |
| 6 | Asymmetric Cyclopropanation Catalyzed by Four Stereoisomers of a Copper-(Schiff-base) Complex with Double Chiral Centers显示文摘Four stereoisomers of a copper-(Schiff-base) complex with double chiral centers were applied to catalyze the asymmetric cyclopropanation. Two of the stereoisomers were also efficient catalysts affording high enantiomeric excess of up to 91.8%. A mechanism that predicts the observed results accurately was proposed. | Chang Sheng JIANG, You Gui LI, Chen JIANG, Fang WANG, Tian Pa YOU* Department of Chemistry, Universtity of Science & Technology of China, Hefei 230026 | 2002 | Chinese Chemical Letters2002，13，12： | 0 |
| 7 | HREELS Studies on Adsorption and Decomposition of ^(15)NO on Mo(100)-c(2×2)N Surface显示文摘High resolution electron energy loss spectroscopy (HREELS) has been used to investigate the adsorPtion and decomposition of 15NO on the Mo(100)-c(2×2)14N surface. At 140K, the 15NO molecu1e could adsorb associatively on atop sites of the Mo and l4N atoms in the nitride layers. On the other hand, a small amount of dissociatCd 15NO also exists. The dissociation of surface nitric oxides species at elevated temperatures caused the oxidation of the surface Mo. | Jun Fa ZHU Shu Xian ZHUANG Jian Chang GUO Run Sheng ZHAI Yu Ming CAO Xin He BAO(Department of Chemical Physics, University of Science and Technology of China, Hefei 230026)(State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chine | 1998 | Chinese Chemical Letters1998，9，7： | 0 |
| 8 | Asymmetric Cyclopropanation Catalyzed by a Copper-(Schiff-base) Complex with Double Chiral Centers显示文摘 | JIANG Chang sheng, LI You gui, JIANG Chen, WEN Ji wu and YOU Tian pa ** Department of Chemistry, Universtity of Science & Technology of China, Hefei 230026 P. R. China | 2003 | Chemical Research in Chinese Universities2003，19，2： | 0 |
| 9 | Reflection on methodology of the correlation between electromagnetic interference and safety in high-speed railway显示文摘Purpose – In the continuous development of high-speed railways, ensuring the safety of the operation controlsystem is crucial. Electromagnetic interference (EMI) faults in signaling equipment may cause transportationinterruptions, delays and even threaten the safety of train operations. Exploring the impact of disturbances onsignaling equipment and establishing evaluation methods for the correlation between EMI and safety isurgently needed.Design/methodology/approach – This paper elaborates on the necessity and significance of studying theimpact of EMI as an unavoidable and widespread risk factor in the external environment of high-speed railwayoperations and continuous development. The current status of research methods and achievements from theperspectives of standard systems, reliability analysis and safety assessment are examined layer by layer.Additionally, it provides prospects for innovative ideas for exploring the quantitative correlation between EMIand signaling safety.Findings – Despite certain innovative achievements in both domestic and international standard systems andrelated research for ensuring and evaluating railway signaling safety, there’s a lack of quantitative and strategic research on the degradation of safety performance in signaling equipment due to EMI. A quantitativecorrelation between EMI and safety has yet to be established. On this basis, this paper proposes considerationsfor research methods pertaining to the correlation between EMI and safety.Originality/value – This paper overviews a series of methods and outcomes derived from domestic andinternational studies regarding railway signaling safety, encompassing standard systems, reliability analysisand safety assessment. Recognizing the necessity for quantitatively describing and predicting the impact ofEMI on high-speed railway signaling safety, an innovative approach using risk assessment techniques as abridge to establish the correlation between EMI and signaling safety is proposed. | Chang Liu Shiwu Yang Yixuan Yang Hefei Cao Shanghe Liu | 2024 | Railway Sciences2024，3，1： | 0 |
| 10 | Self-Organization of PbS into Quantum Dots Superlattices显示文摘Self-organization of PbS into quantum dots superlattices is demonstrated for the first time, and hexaplanar colloidal crystals 1-10μm in size made from PbS quantum dots 4nm in diameter are shown in Transmission Electron Microscope (TEM) micrograph, and the inner structures of the superlattices can be seen from the High Resolution Transmission Electron Microscope (HRTEM). | Lian Zeng YAO Chang Hui YE Chi Mei MO Ye ZHANG Li De ZHANG(Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031) | 2000 | Chinese Chemical Letters2000，11，7： | 0 |
| 11 | SINERING BEHAVIOUR OF RANEY-COPPER CATALYST IN VARIOUS ATMOSPHERES显示文摘Raney-Copper(R-Cu)catalyst was prepared and its sintering behaviour in atmospheresat teperature 300℃-600℃ was detected by methods of SSA,PSD,XRD and SEM.It was found thatsintering of R-Cu started from much lower temperature than the melting point of copper.Changesboth on the surface and in the body phase were discovered.There is a rule in the extent ofsintering for R-Cu in different atmospheres which is related to the adsorption of the particulargases molecules on the surface of the catalyst.Dynamical equations of the surface decrease isestablished and the mechanism of sintering is discussed.Calculations of quantum mechanics givethe similar results. | Chong Zheng FAN Chang Sui WANG Sheng Jun WANG (The University of Science and Technology of China,Hefei,Anhui,P.R.China) You Shi WU (Institute of Machine & Electricity of An Hui Province,Wu Hu) D.L.TRIMM M.S.WAINWRIGHT (The University of New South Wales,Australia) | 1990 | Chinese Chemical Letters1990，1，3： | 0 |
| 12 | Computer Simulation and X-ray Diffraction of Nanocrystals显示文摘X-ray diffraction of structure in nanocrystalline α-Fe and Cu was studied by atomistic simula-tion. Atomic position equilibrium was reached by using molecular dynamics method to simulate nanocrystalline structure with Finnis potentials to model interatomic interactions. It was found that the boundary component exhibits short-range order, and the distortion in crystalline com-ponent increases with the decrease of grain size. | Ming CHANG, Baohe YANG and Xiaolu XI Tianjin Institute of Technology, Tianjin 300191, China Hao CHANG Hefei Institute of Technology, Hefei 230009, China E-mail: changm@public.tjuc.com.cn | 2001 | Journal of Materials Science & Technology2001，17，3： | 0 |
| 13 | Adsorption and Reaction of CO on Mo(100)-c(2×2)-N Surface Studied by HREELS显示文摘High resolution electron energy loss spectroscopy (HREELS) has been used to investigate the adsorption and reaction of CO on the Mo(100)-c(2×2)N surface. CO directly adsorbed on the N atoms from the c(2×2) layer to form isocyanate (NCO) surface species was found in addition to CO adsorbed on the molybdenum atoms at 120 K. indicating that both Mo and N atoms of the Mo(100)-c(2×2)-N surface are of high reactivities for CO adsorption. | Jun Fa ZHU.,ian Chang GUO, Run Sheng ZHAI, Xin He BAO, Shu Xian ZHUANG ( National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 Department of Chemical Physics. University of Science and Technology of China | 2000 | Chinese Chemical Letters2000，11，3： | 0 |
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