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| 1 | Monitoring the concentration of N_2O in the Fildes Peninsula, maritime Antarctica显示文摘Gases in the marine boundary layer in Fildes Peninsula, maritime Antarctica were sampled and analyzed for the first time. Sampling sites included areas covered by moss and lichen growth, penguin colonies and an area where scientific research stations are located. A total of 211 samples were analyzed for N2O concentrations, with an average of (321.33±3.07) nL/L. This is above the global average value of 314 nL/L. It is found that the N2O concentrations evidently increase during the summer months. Concentrations around the research stations are higher than at remote areas, indicating a potential source from human activities on the island. N2O concentrations at a large penguin colony on Barton Peninsula are the highest among the sampled areas. This may explain why N2O concentrations in Fildes Peninsula are higher than the global average. Our preliminary conclusions are that human activities and emissions from penguin dropping-amended soil and vegetation soil constitute the major sources of N2O in the | SUN Liguang, XIE Zhouqing, ZHAO Junlin, XING Guangxi, SHI Shulian & Du LijuanInstitute of Polar Environment, University of Science and Technology of China, Hefei 230026, China Institute of Environmental Science, Beijing Normal University, Beijing 100875, China Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 2 10008, China | 2000 | Chinese Science Bulletin2000，45，21： | 21 |
| 2 | 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 |
| 3 | Experimental study on fire smoke movement in a multi-floor and multi-room building显示文摘Fire smoke movement of multi-floor and multi-room (MFMR) fire was studied at the model test building in State Key Laboratory of Fire Science (SKLFS). The ingredient, temperature, air pressure difference and air velocity of smoke were measured and analyzed. Meanwhile, the hazard of smoke ingredient to exposed occupants was analyzed based on the national standard, Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002). The experimental results showed that the maximum temperature difference in MFMR fire was located along the vertical height from the fire source. With the spreading and diffusion of smoke, the temperature of smoke layer would tend to be no difference. In the fire of woodpile and kerosene, the main smoke ingredients such as SO 2 , CO and CO 2 would first exceed human’s average physiological limit, while smoke ingredients such as NO and NO 2 would come behind. Because of the higher fluctuation range and frequency of air pressure difference of smoke in multi-layer building fire, the fire smoke would spread around everywhere of the passageway and made the human evacuation more difficult. | ZHONG Maohua 1, 2 , LI Peide 2 , LIU Tiemin 1 , WEI Xing 1, 2 & LIAO Guangxuan 2 1. National Center of Safety Science and Technology, State Administration of Work Safety, Beijing 100029, China 2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China | 2005 | Science China(Technological Sciences)2005，48，3： | 4 |
| 4 | An efficient screening system to identify protein-protein or protein-DNA interaction partners of rice transcription factors显示文摘Plant transcription factors(TFs)are key molecular components in the regulation of plant growth,development,and environmental adaptability.Generally,TFs need to form complexes with other interactors to control gene transcription.For example,Heading date 1(Hd1),Grain number,plant height and heading-date(Ghd)7,or Ghd7.1 interacts with Ghd8 and NF-YCs to form a trimeric complex,respectively. | Qingmei Su Fang Zhang Yunping Xiao Pingping Zhang Hefei Xing Fan Chen | 2022 | Journal of Genetics and Genomics2022，49，10： | 1 |
| 5 | EFFECT OF SLIP ORIENTATION ON STRESS RESPONSE,INTERNAL FRICTION AND ULTRASONIC ATTENUATION DURING CYCLIC DEFORMATION IN Al SINGLE CRYSTALS显示文摘The variation of cyclic stress,internal friction and ultrasonic attenuation during cyclicdeformation and relations among them have been investigated with different slip orientationAl single crystals.The results indicate that the value of cyclic stress σ,internal frictionQ-1and ultrasonic attenuation △α depend obviously on the slip orientation.There are largedifferences in above three parameters for different slip orientation Al crystals.In early stageof fatigue life,σ and △α increase and Q-1decreases with cycles N,and △α reached maxi-mum before σ,while Q-1and σ get the valley and the peak,respectively,at same cycles. | XIA Yuebo ZHANG Tianyi State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,ChinaFEI Guangtao ZHOU Xing Laboratory of Internal Friction and Defects in Solids,Institute of Solid State Physics,Academia Sinica,Hefei,China Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，6： | 0 |
| 6 | A Class of Iterative Formulae for Solving Equations显示文摘Using the forms of Newton iterative function, the iterative function of Newton's method to handle the problem of multiple roots and the Halley iterative function, we give a class of iterative formulae for solving equations in one variable in this paper and show that their convergence order is at least quadratic. At last we employ our methods to solve some non-linear equations and compare them with Newton's method and Halley's method. Numerical results show that our iteration schemes are convergent if we choose two suitable parametric functions λ(x) and μ(x). Therefore, our iteration schemes are feasible and effective. | Sheng Feng LI1,2,3, Jie Qing TAN1,2, Jin XIE1,2,4, Xing HUO1,2 1. School of Computer & Information, Hefei University of Technology, Anhui 230009, P. R. China 2. Institute of Applied Mathematics, Hefei University of Technology, Anhui 230009, P. R. China 3. Department of Mathematics & Physics, Bengbu College, Anhui 233030, P. R. China 4. Department of Mathematics & Physics, Hefei University, Anhui 230601, P. R. China | 2010 | Journal of Mathematical Research and Exposition2010，30，2： | 0 |
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