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Eu(III) adsorption on rutile:Batch experiments and modeling

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science china Chemistry 2010年第12期53卷 2628-2636页

作者： WANG XueFeng,SHI KeLiang,GUO ZhiJun & WU WangSuo Radiochemistry Lab,school of Nuclear science and {2.,lanzhou university,lanzhou 730000,china Radiochemistry Lab School of Nuclear Science and Technology Lanzhou University Lanzhou China

Eu(III) adsorption on rutile was investigated as a function of contact time,pH,ionic strength and Eu(III) concentration by using a batch experimental *** effects of carbonate,sulfate,and phosphate were also *** was found that the kinetics of Eu(III) adsorption on rutile could be described by a pseudo-second-order *** adsorption of Eu(III) on rutile is strongly pH-dependent,but relatively insensitive to ionic strength.A double layer model (DLM) with two inner-sphere Eu(III) surface complexes was applied to quantitatively interpret the adsorption of Eu(III) on *** were no apparent effects of carbonate and sulfate on Eu(III) adsorption,whereas the presence of phosphate promoted Eu(III) adsorption on *** surface complexes of Eu(III) on rutile were evidenced by X-ray photoelectron spectroscopy (XPS).

关键词： Eu(III) adsorption rutile kinetics surface complexation modeling XPS

Characteristics and origins of primary fluids and noble gases in mantle-derived minerals from the Yishu area,Shandong Province,china

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science china Earth sciences 2006年第1期49卷 77-87页

作者： MA Jinlong1,2. TAO Mingxin2.3 & YE Xianren2.1. Resources and Environmental school, lanzhou university,{2., china 2. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of sciences,{2., china 3. College of Resources science & technology, Beijing Normal university, Beijing 100875, china Resources and Environmental school Lanzhou University Lanzhou China Key Laboratory of Gas Geochemistry Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou China College of Resources science & technology Beijing Normal University Beijing China

Fluids and noble gases of mantle-derived materials are important tracers forthe mantle information. Compositions of primary fluids and noble gases in mantle-derived mineralsfrom the Yishu area, Shandong Province, china, were tested by the methods of heat-bursting andheat-melting respectively. The fluids are mainly composed of CO_2. CO and H_2. which account forabout 90% of the total, and are similar to the mantle-derived rocks from other areas of easternchina; ratios of ~3He/~4He in almost all samples range from 0.82.Ra to 2.74 Ra, whereas^(40)Ar/^(36)Ar from 2.9.5 to 758.8. Both ranges are much lower than those of the typical oceanmantle-derived samples (such as MORB) and primarily reflect the influences of the atmosphericcomponents and the radiogenic isotopes. Ratios of C/~3He range from 2..6 x 10~9 to 1050 x 10~9,N_2.Ar from 92. to 56612. and N_2.~3He from 2.5 x 10~9 to 2. x 10~9, similar to those in westernUnited States and New Zealand which belong to the tectonic plate collision regions. The ratios fallin the intersect of mantle-crust-atmosphere in the comprehensive tracer-charts, reflecting theinfluences of the atmosphere and the crusts with organic components. Our results suggest that thecomposition of the primary fluids and the isotopic ratios of the noble gases may either reflect theevolution process of mantle-derived rocks connected with the rise and eruption of magma, or theinfluence of the ancient subduction-plate on the continental mantle of this region.

关键词： noble gases, primary fluids, mantle-derived minerals, Yishu area.

Improvements on radiation-hardened performance of static induction transistor

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science china(Information sciences) 2010年第5期53卷 1089-1096页

作者： WANG YongShun 1 , LUO XianLiang 1 , LI HaiRong 2., WANG ZiTing 1 , WU Rong 1 , ZHANG CaiZhen 2.& LI SiYuan 2.1 school of Electronic and Information Engineering, lanzhou Jiaotong {2., lanzhou 730070, china 2.Institute of Microelectronics, school of physical science and technology, lanzhou university, lanzhou 730000, china school of Electronic and Information Engineering Lanzhou Jiaotong University Lanzhou China Institute of Microelectronics School of Physical Science and Technology Lanzhou University Lanzhou China

The radiation-hardened performances of static induction transistor (SIT) have been studied in depth in this paper. The effects of radiation of electron beam on the I-V characteristics, carrier distribution and potential distribution in the channel of SIT have been represented. A large number of electron-hole pairs are generated in the depletion region of reversely biased gate-channel PN junction. The radiation-generated electrons drift towards the drain region at high positive potential, while generated holes flow into gate region biased to the lowest potential. With the accumulation of holes in gate region, the gate potential is boosted, resulting in a decrease in the height of potential barrier in channel, and an increase in drain current. I-V characteristics of SIT in the presence of radiation have been theoretically derived, and compared with experimental results. With the increase in thickness of epitaxial layer, the radiation-hardened capability of SIT is continuously improved until the optimum thickness of 2. μm is reached. The optimum matching relationship among geometric, material and technological parameters has been represented to acquire excellent radiation-hardened performances of SIT.

关键词： static induction transistor radiation-resistant potential barrier electron beam radiationgenerated carriers

Numerical study on short-circuit current of single layer organic solar cells with Schottkey contacts

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science china(Technological sciences) 2010年第4期53卷 1023-1027页

作者： MA ChaoZhu1,MENG WeiMin2.PENG YingQuan1,2.WANG RunSheng1,LI RongHua1,XIE HongWei1,WANG Ying1 & YE ZaoChen1 1 Institute of Microelectronics of school of physical {2. and technology,lanzhou university,lanzhou 730000,china 2.Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,lanzhou university,lanzhou 730000,china Institute of Microelectronics of school of physical {2. and technology Lanzhou University Lanzhou China Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University Lanzhou China

The influence of the cathode work function,carriers mobilities and temperature on the short-circuit current of single layer organic solar cells with Schottkey contacts was numerically studied,and the quantitative dependences of the short-circuit current on these quantities were *** results provide the theoretical foundation for experimental study of single layer organic solar cells with Schottkey contacts.

关键词： cathode work function carrier mobility temperature short-circuit current

Experimental study on high-voltage solar array sustained arc discharge induced by high charging

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science china(Technological sciences) 2007年第2期50卷 213-220页

作者： LI Kai1,2. XIE ErQing1, WANG Li2. LIU YanXia1, YANG Yang1, SUN YanZheng3, CUI XinYu3 & MAI ShengLi2.1 school of physical {2. and technology, lanzhou university, lanzhou 730000, china 2.lanzhou Institute of Physics, lanzhou 730000, china 3 Tianjin Institute of Power Source, Tianjin 300381, china school of physical {2. and technology Lanzhou University Lanzhou China lanzhou Institute of Physics Lanzhou China Tianjin Institute of Power Source Tianjin China

It has been reported that sustained arc discharge induced by electrostatic discharge (ESD) could cause permanent damage to high-power and high-voltage solar array of spacecrafts. The paper focuses on ESD simulating experiments on Si and GaAs samples, and induces sustained arc discharge. The physical mechanism of sustained arc discharge is discussed by comparing the charging/discharging phenomena between Si and GaAs samples. The experiments show that sustained arc discharge can produce a permanent short-circuit channel between solar cell strings through which the solar array’s photovoltaic power may flow out sustainedly. The analyses show that sustained arc discharge strongly depends on solar array structure, solar array operating voltage, ESD characteristics and cell materials. Keywords high-voltage solar array - electrostatic discharge - sustained arc discharge - mechanism Supported by the National Laboratory of Vacuum, Cryogenics technology and Physics (Grant No. 51475030504DZ2.01), and the National High technology Development Program of china (Grant No. 2.02.A732.58)

关键词： high-voltage solar array electrostatic discharge sustained arc discharge mechanism

Predictions of synthesizing element 119 and 12.

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science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 61-66页

作者： GAN ZaiGuo1, ZHOU XiaoHong1, HUANG MingHui1, FENG ZhaoQing1 & LI JunQing1,2.1Institute of Modern Physics, Chinese Academy of sciences, lanzhou 730000,{2. 2.3} of Nuclear science and technology, lanzhou university, lanzhou 730000,{2. Institute of Modern Physics Chinese Academy of Sciences Lanzhou China school of Nuclear science and {2. Lanzhou University Lanzhou China

The evaporation residue cross sections of synthesizing superheavy nuclei Z=119, 12. are calculated by different sets of master equations with different dynamical variables. Two methods basically predicted similar results that the Ca induced hot fusion can 48 produce element 119 easier than produce 12., and the evaporation residue cross sections for 119 are detectable by current advanced techniques, while the evaporation residue cross sections are below 0.1 pb for producing element 12..

关键词： super heavy nuclei evaporation residue cross section master equations

Friction-reducing and antiwear behavior of metal halide-stabilized linear phosphazene derivatives as lubricants for a steel-on-steel contact

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science china(Technological sciences) 2005年第3期48卷 282-291页

作者： ZHU Jiamei 1,2., LIU Weimin 2.& LIANG Yongmin 2.1. school of Chemical Engineering and technology,{2. university of Mining and technology, Xuzhou 2.1008,{2. 2. State Key Laboratory of Solid Lubrication, lanzhou Institute of Chemical Physics, Chinese Academy of sciences, lanzhou 730000,{2. school of Chemical Engineering and technology China University of Mining and Technology Xuzhou China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou China

A series of novel metal halide-stabilized linear phosphazene derivatives were synthesized. The friction-reducing and antiwear abilities of the resulting products as the lubricants for a steel-on-steel contact were comparatively investigated on an Optimol SRV oscillating friction and wear tester. The morphology of the worn steel surface was observed on a scanning electron microscope, while the chemical states of some typical elements on the worn steel surface were examined by means of X-ray photoelectron spectroscopy. It was found that both the side branch structures and central metals influenced the friction-reducing and antiwear behaviors of the synthetic derivatives as the lubricants, which was related to the different adsorption activities of the organic compounds composed of different organic ingredients and metallic ions on a nascent metal surface. All the synthetic lubricants except for the iron (III) derivative showed increased antiwear abilities with increasing metallic ionic radius. A protective layer originated from the tribochemical reaction together with the adsorbed boundary lubricating layer containing organic fluorine compounds, nitrogen oxide, and Fe 3 (PO 4 ) 2.plays an important role in improving the friction and wear behavior of the steel-on-steel system.

关键词： metal halide-stabilized linear phosphazene derivatives,lubricant,steel,tribological properties.

Radiobiological response of human hepatoma and normal liver cells exposed to carbon ions generated by Heavy Ion Research Facility in lanzhou

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science china(Physics,Mechanics & Astronomy) 2006年第1期49卷 72-76页

作者： YANG Jianshe1,2. LI Wenjian1, JIN Xiaodong1, JING Xigang1, GUO Chuanling1, WEI Wei1 & GAO Qingxiang3 1. Institute of Modern Physics, Chinese Academy of sciences, lanzhou 730000,{2. 2. Life science school of North West Normal university, lanzhou 730070,{2. 3. Life science school of lanzhou university, lanzhou 730000,{2. Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Life science school of North West Normal {2. Lanzhou China Life science school of{2. Lanzhou China

Human hepatoma and normal liver cells were irradiated with 12.6+ ion beams (LET = 96.05 keV/μm) and γ-rays at Heavy Ion Research Facility in lanzhou (HIRFL). The chromatid breaks and break types were detected using the premature chromosome con- densation technique. Our experimental results showed that chromatid breaks seem to have a good relation with 12.6+ absorbed dose and 12.6+ are more effective to induce chromatid breaks as compared to the γ-rays. For 12.6+ ion irradiation the major break was isochromatid break, while chromatid breaks were dominant for γ-ray irradiation. We also observed that the Relative Biology Effectiveness (RBE) of 12.6+ ion is about 2.5 times higher than that of γ-rays.

关键词： biological response, tumor cell, normal cell, heavy ion HIRFL.

Vicissitude of Sogo Nur and environmental-climatic change during last 1500 years

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science china Earth sciences 2004年第Z1期47卷 61-70页

作者： JIN Heling, XIAO Honglang, SUN Liangying, ZHANG Hong, SUN Zhong & LI XiaozeKey Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of sciences, lanzhou 730000,{2. school of Resources and Environment, lanzhou university, lanzhou 730000,{2. Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China school of Resources and Environment Lanzhou University Lanzhou China

Lakes in arid zone are sensitive to climatic changes. The lacustrine sediment sequence in Sogo Nur has well and truly recorded climatic events such as the Sui-Tang Dynasty Warm Period, the Song-Liao Dynasty Cold Period, the Medieval Warm Period, the Little Ice Age and the 2.th Century Warm Period. Commonly, the climate in warm Periods was relatively humid,accordingly the lake area extended and water level rose, and vice versa. Apart from climatic change, human activity is also an important factor of influencing lake vicissitude, and they played the dominant role alternatively during different periods; the factor of climatic change predominated in historical period, while since the beginning of the 2.th century the utilization of water resources by human has became decisive.

关键词： granularity, soluble salt, lake vicissitude, climatic change, Sogo Nur.