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Pollution and Prevention of Pb during Cement Calcination

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Journal of Wuhan university of Technology(Materials Science) 2007年第3期22卷 542-545页

作者：林少敏苏达根 Key Laboratory for Special Function Materials and Advanced Manufacturing Technology of Ministry of Education South China University of Technology

Emission pollution and prevention measures of Pb during cement calcination were discussed. The content of Pb and the variation of composition were explored by means of atomic absorption spectroscopy （AAS） and X-ray diffraction. The results show that a number of Pb emits during cement calcination, F and Cl promote the emission of Pb, and Pb is enriched in kiln dust. The smaller the particle of kiln dust, the higher the content of Pb. When utilizing the raw materials with a high content ofPb, a more efficient dust collector should be used and the kiln dust should be used as the addition of cement. Pb in clinker is enriched in the intermediate phase. The reduction of silica modulus is useful to increase the solidification content of Pb in clinker. The solidification content of Pb in calcium sulphoaluminate mineral is higher than that in calcium aluminate mineral.

关键词： lead(Pb) emission kiln dust clinker mineral solidification

Modes in Air-core Bragg Fibers

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Modes in Air-core Bragg Fibers

Designing regional pattern for ecosystem restoration:A case study

2.07 5th International Conference on Microwave and Millimeter Wave Technology(ICMMT’2.07)

作者： XIAO Chun-lai YANG Li department of Electronic Engineering and Information Science university of Science and Technology of{2. Hefei anhui 2.002. china

The modes supported in air-core Bragg fibers are modeled and simulated by using a full-vectorial 1-Dimensional finite-difference frequency-domain method （FDFD）.A perfectly matched layer （PML） terminated by a zero boundary condition is applied as numerical absorption boundary condition such that with proper PML parameters,three types of modes are well defined and divided into branches in the mode *** three types of modes can be identified as quasi-guided modes,mainly depending on Bragg fiber properties;leaky modes,having tricky relationship with the parameters of both Bragg fiber and PML;and PML modes,mainly depending on the parameters of PML.

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Science china(Technological Sciences) 2006年第z1期49卷 86-97页

作者： LI Guoqiang , MA Keming, FU Bojie & LIU Shiling State Key Lab of Systems Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, china department of Water Environment, china Institute of Water Resources and Hydropower Research, Beijing 100038, china School of Environmental Sciences, Beijing normal university, Beijing 100875, china 1. State Key Lab of Systems Ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China 2. department of Water Environment China Institute of Water Resources and Hydropower Research Beijing 100038 China 3. School of Environmental Sciences Beijing Normal University Beijing 100875 China

Designing regional pattern is challenging for ecosystem restoration both in theory and in practice. The present study proposed a new approach to design regional pattern for ecosystem restoration with a case in the arid valley of Upper Minjiang River, SW china. The procedures are: (1) Determine the regional pattern of main environmental factors based on the relationships between the important environmental factors and the main geographical factors generated from DEM data. (2. Overlay the maps of the main environmental factors. (3) Generate a lookup table according to the species selection rule we proposed to link the candidate restoration species to the main environmental factors.(4) Determine the regional pattern of ecosystem restoration by positioning the restoration species in the map of environmental factors according to the lookup table. The regional restoration pattern designed in this way would be applicable not only to restoring a region, but also to predicting the future landscape change.

关键词： environmental factors, GIS, restoration species, Upper Minjiang River Valley.

Existence Theorem of the Multipliers on Riemannian Symmetric Space SL(3,H)/SP(3)

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Wuhan university Journal of Natural Sciences 2004年第6期9卷 858-862页

作者： LIAN Bao-sheng 1,2., ZHU Fu-liu 1 1.School of mathematics and Statistics, Wuhan university, Wuhan 430072. Hubei,{2. 2.department of mathematics,Huazhong university of Scicence and Technology,Wuhan 430074,Hubei,china Wuhan university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Huazhong university of Science and Technology Department of Mathematics Wuhan Hubei China (GRID:grid.33199.31) (ISNI:***) Wuhan university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***)

Using the method of Clerc and Stein study the multipliers of spherical Fourier transform on symmetric space to proof the multipliers theory for the space SL(3,H)/SP(3), completely avoid the complex theory of Anker, and we have gain the same result. Key words Riemannian symmetric space SL(3,H)/SP(3) - multipliers - spherical Fourier transform - invariant differential operator CLC number O 152.5 - O 186.12.Biography: LIAN Bao-sheng (1973-), male, Master, research direction: Li group and Lie algebra.

关键词： Riemannian symmetric space SL(3,H)/SP(3) multipliers spherical Fourier transform invariant differential operator

Density Measurement of Liquid Ni-Ta Alloys by a Modified Sessile Drop Method

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Journal of Wuhan university of Technology(Materials Science) 2005年第2期20卷 67-70页

作者：方亮 department of Applied Physics Chongqing UniversityChongqing 400044 China Satellite Venture Business Laboratory Kyushu Institute of TechnologyKitakyushu 804-8550Japan Assoc.Prof

The density of liquid Ni-Ta alloys was measured by using a modified sessile drop method. It is found that the density of the liquid Ni-Ta alloys decreases with the increasing temperature, but increases with the increase of tantalum concentration in the alloys. The molar volume of liquid Ni-Ta binary alloys increases with the increase of temperature and tantalum concentration.

关键词： Ni-Ta alloy density modified sessile drop method molar volume tantalum concentration

Paleomagnetic dating of the Cenjiawan Paleolithic site in the Nihewan Basin, northern china

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Science china Earth Sciences 2006年第3期49卷 295-303页

作者： WANG Hongqiang1,2. DENG Chenglong1, ZHU Rixiang1 & XIE Fei3 1. Paleomagnetism and Geochronology Laboratory (SKL-LE), Institute of Geology and Geophysics, Chinese Academy of Sci- ences, Beijing 10002., china 2. School of the Earth Sciences and Resources, china {2. of Geosciences, Beijing 100083, china 3. Hebei Province Institute of Cultural Relics, Shijiazhuang 050000, china 1. Paleomagnetism and Geochronology Laboratory (SKL-LE) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 2. School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China 3. Hebei Province Institute of Cultural Relics Shijiazhuang 050000 China

Rock magnetic and magnetostratigraphic investigations on a lacustrine sequence in the Nihewan Basin, northern china, which bears the Cenjiawan Paleolithic site, indicate that the dominant magnetic mineral and remanence carrier contained in the sediments is magnetite. While hematite co-exists with magnetite in some portions of the Cenjiawan sequence, where characteristic remanent magnetizations are carried by both magnetite and hematite. Measurements of anisotropy of magnetic susceptibility confirm that the Cenjiawan sequence has preserved the original sedimentary features and is suitable for magnetostratigraphic study. Paleomagnetic results indicate that the Cenjiawan Paleolithic site is formed just posterior to the Punaruu normal event, which is dated at about 1.1 Ma. Combined with the paleomagnetic results of the Donggutuo, Xiaochangliang and Majuangou sections, it is concluded that early humans were occupying the Nihewan Basin around 1.6, 1.3 and 1.1 Ma. This integrated result is significant to understanding the ability of migration and adaptation to the envi- ronment of early humans.

关键词： Nihewan Basin, Early Pleistocene, Cenjiawan, Paleolithic site, paleomagnetism.

Asphalt　fractions　in　airborne　particles　from　highway　traffic　and　the　accumulation　in　plants

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Journal of Environmental Sciences 1996年第2期8卷 196-202页

作者： He Kebin(department of Environmental Engineering, Tsinghua university, Beijing 100084,{2.)Hans Mosbaek Jens Chr. Tjell(department of Environmental Engineering,Technical university of Dentnark, 2.00 Lyngby,Denmark) Dept. of Environmental Engineering Tsinghua University Beijing 100084 China Dept. of Environmental Engineering Technical University of Denmark 2800 Lyngby Denmark

With reference to ASTM D412., asphalt fractions, including polar aromatics (polars),naphthene aromatics (aromatics) and saturates,were characterized both in airborne particles collected in the distances of 2.0 -83.6m from the highway and in the plant samples (including grass,leaves and wheat straw) collected in the distance of 2.0 -10. 0m from the highway. In comparison to the results of diesel particulate, background plant samples and asphalt cernent samples from highway surface, it is concluded that there could be asphalt rnatters in airborne particles and asphalt makes the rnain contributions to the accumulation of the three factions mentioned above in plant species. In the ambient air,the concentrations of the three asphalt fractions are 0. 54- 3.06 ×10-3 mg polars,1. 77- 9. 50 × 10-4 mg aromatics and 0. 2.- 1. 2. × 10-4 mg saturates for per cubic meter air. The percentage of bitumen in airborne particles is 1. 61%-11. 02.. In the plant samples, the concentrations are 0. 2.- 3.07mg polars, 0.89- 3.89 aromatics and 0. 37-1. 53 mg saturates for per gram dry plant materials.

关键词： asphalt airborne particle traffic pollution HPLC.

Effect of Solute Drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 383-387页

作者： FU Li-ming 1,WANG Huan-rong 2.WANG Wei 2.SHAN Ai-dang 1 (1.School of Materials Science and Engineering,Shanghai Jiaotong university,Shanghai 2.02.0,china 2.{2. of Structural Steels,Baosteel Research Institute,Shanghai 2.1900,china) Shanghai Jiao Tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed *** analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p>0 and p<0,respectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels

Electrically Conductive Concrete for Heating Using Steel Bars as Electrodes

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Journal of Wuhan university of Technology(Materials Science) 2010年第3期25卷 523-526页

作者：侯作富 School of Mechanical Engineering Yangtze University

The steel bars with good electrical conductivity were used as two kinds of electrodes in the making of carbon fiber（CF） electrically conductive concrete for *** results of the pertinent experiments illustrate the design is *** change in electrical resistivity over three years＇ hydration time was studied when steel bars were used as lateral face electrodes and top bottom surface electrodes *** temperature rise test was conducted to verify the heating properties of two kinds of *** only the study can reduce the CF volume content of electrically conductive concrete for heating to 0.58% or 0.36% according to different design,but also it will enhance the carrying capacity of the concrete roadway for heating.

关键词： steel bar carbon fiber electrical resistivity temperature rise