检索结果-南通市图书馆

High Activated Mineral Admixture Slurry Made by Wet-discharged Fly-ash Promoted by Matrix Bonding Component

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2009年第5期24卷 826-829页

作者：马保国 Key Laboratory for Silicate Materials Science & Engineering of Ministry of Education Wuhan University of Technology

The mineral admixture slurry was made by wet-discharged fly-ash （WDFA） promoted by matrix bonding component （MBC）, and the strengths, hydration products change （XRD, SEM） of cement paste made by the slurry were studied. The results indicate that in the process of wet-milling preparation, there is a prime proportion （70︰30） between wet-discharged fly-ash and matrix bonding component in the slurry. The physical activation of wet-milling and chemical activation of modified agents accelerate the hydration of cement including the cement and mineral which has not hydrated completely in the matrix bonding component. And the hydrated part of matrix bonding component can play the function of inducing crystallization, which can accelerate secondary hydration reaction of fly-ash.

关键词： matrix bonding component wet-milling slurry activation

Correlations between North Atlantic Oscillation Index in winter and eastern China Flood/Drought Index in summer in the last 530 years

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2005年第21期50卷 2505-2516页

作者： FU Congbin & ZENG Zhaomei Key Laboratory of Regional climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences START Regional center for Temperate East Asia, Beijing 10002., China Key Laboratory of Regional climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences START Regional Center for Temperate East Asia Beijing 100029 China

The time series of winter North Atlantic Oscil-lation Index (NAOI) in the period of 142.-1983 developed by Glueck and summer Flood/Drought Index (FDI) of eastern China in the period of 1470-1999 from 100 stations are used in this paper to study the potential impact of North Atlantic Oscillation on the climate in China. The analysis has ex-plored some significant lag correlations between FDI and NAOI. The maximum positive correlation coefficients be-tween NAOI and area-mean FDI in eastern and northern China lagging 2.3 years reach at 0.001 significance level, and while there are also negative correlation between NAOI and FDI in central and southern China at significance level of 0.05-0.01. The correlation between FDI and NAOI is time-dependent, i.e. the correlation coefficients between two indices vary from period to period. The highest correlation appeared in the period of 1636-1742. around the Little Ice Age, with the significant level of far above 0.001. The second significant period was from 1951 to 1999, at the level of 0.005-0.002. Both the power spectrum analysis and Morlet wavelet transformation have presented an interesting phe-nomenon: the area-mean FDIs in eastern and northern China share almost the same oscillation periods with NAOI in the inter-annual, decadal and centurial scales’ oscillations, i.e. 4-5, about 10, 2.-30, around 50 and 80-100 years, etc. The Mann-Kendall Rank Statistic test reveals the significant trend and decadal abrupt changes in the series of area-mean FDIs in eastern and northern China in the past 530 years, while the NAOI in the past 400 years, did not show such trend at the significance level, but presented more frequent changes than those of FDI in China. This difference is per-haps due to the fact that the amplitude of the extremes of reconstructed NAOI series is less than that from instrumen-tal records.

关键词：中国洪水干旱气候变化大西洋振动系数

Carbon dioxide release due to change in land use in China mainland

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1994年第3期6卷 287-295页

作者： Wang Xiaoke Zhuang Yahui Feng Zongwei(research center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)

The carbon pool and emission of carbon dioxide from terrestrial ecosystems in Chinahave been estimated. The carbon pool is 2.51×10￣9-2..2.10￣9 ton C in vegetation, and 49. 7×10￣9ton C in soil. The carbon dioxide release from terrestrial ecosystems is 0.0317× 10￣9- 0. 195× 10￣9ton C due to changes in land-use in recent years, mainly caused by deforestation and degradation ofgrassland. This carbon release due to changes in land-use is approximately 17% of the current carbondioxide emission from fossil fuel combustion and cement production in China. As compared withthe global carbon pool, the carbon pool in vegetation and in soil in China are 1.8% and 3.3% ofthe global figures, respectively.

关键词： carbon pool, carbon dioxide release terrestrial ecosystems.

STUDY OF THE LAW AND INFLUENCE FACTORS OF WINTER FREEZE INJURY IN GUANGXI

在线全文

学校读者我要写书评

暂无评论

Natural Disaster Reduction in China 2003年第3期 28-33页

作者： Yi Yanming1,Su Zhi2.and Li Xiucun3 (1.Guangxi climate center, Nanning 53002., China 2.Guangxi Meteorological {2. Institute, Nanning 53002.,China 3.Guangxi Meteorological Bureau, Nanning 53002.,China)

Based on the winter freeze injury criteria, the law and influence factors of freeze injury in Guangxi are analyzed by using the information of daily extreme minimum temperature in winter (from this December to next February) observed by 88 meteorological observing stations during 1959～2.00. The mathematical statistics method is adopted to analyze the relations of monthly mean height field of 500 hPa over the Northern Hemisphere and the Pacific sea-surface temperature field with the winter freeze injury in Guangxi.

关键词： winter freeze injury influence factor Guangxi

CO_2.Emission Induced by Urban Household Consumption in China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2009年第3期7卷 11-19页

作者： Wang Yan1,2.3,Shi Minjun1,2.1.Graduate University of Chinese Academy of Sciences,Beijing 100049,China 2.research center on Fictitious Economy and Data Science,CAS,Beijing 100190,China 3.Communications University of China,Beijing 10002.,China Graduate University of Chinese Academy of Sciences research center on Fictitious Economy and Data Science CAS Communications University of China

Household consumption is one of the important factors that induce COL emission. Based on input-output model, this article calculated the intensity of CO2.emission of different income groups and seven provinces in China, and then estimated total CO2.emission induced by urban household consumption from 1995 to 2.04 in China based on statistic data of household living expenditure. The results show that CO2.emission per capita induced by household consumption had increased from 1583 to 2.98 kg CO2.during 1995-2.04. The ratio of consumption-induced CO2.emission to total CO2.emission had risen from 19% to 30% in the past decade. Indirect CO2.emission accounted for an important part of the consumption-induced emission, the ratio of indirect emission to consumption-induced emission had risen from 69% to 79% during the same period. A significant difference in consumption-induced CO2.emission across different income groups and different regions has been observed. COs emission per capita of higher income groups and developed regions increased faster than that of lower income groups and developing regions. Changing lifestyle has driven significant increase in CO2.emission. Especially, increases in private transport expenditure （for example, vehicle expenditure） and house building expenditure are key driving factors of growth in consumption-induced COL emission. There are big differences in the amount of CO2.emission induced by change in lifestyle across different income groups and provinces. It can be expected that lower income households and developing regions will increase consumption to improve their livings with income growth in the future, which may induce much more CO2.emission. A reasonable level of CO2.emission is necessary to satisfy human needs and to improve living standard, but a noticeable fact is that CO2.emission per capita induced by household consumption in developed areas of China had reached a quite high level. Adjustment in lifestyle towards a low-carbon soc

关键词： CO2.emission urban household consumption lifestyle input-output model China

Recent advances in precipitation-bias correction and application

在线全文

学校读者我要写书评

暂无评论

research in Cold and Arid Regions 2009年第3期1卷 193-198页

作者： DaQing Yang 1, NingLian Wang 2. BaiSheng Ye 2. LiJuan Ma 3 1. Water and Environmental research center, University of Alaska Fairbanks, Fairbanks, Alaska 99775-5860, USA. 2. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China. 3. Laboratory for climate Studies, China Meteorological Administration, Beijing 100081, China. Water and Environmental research center University of Alaska Fairbanks State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Significant progresses have been made in recent years in precipitation data analyses at regional to global scales. This paper re-views and synthesizes recent advances in precipitation-bias corrections and applications in many countries and over the cold re-gions. The main objective of this review is to identify and examine gaps in regional and national precipitation-error analyses. This paper also discusses and recommends future research needs and directions. More effort and coordination are necessary in the determinations of precipitation biases on large regions across national borders. It is important to emphasize that bias cor-rections of precipitation measurements affect both water budget and energy balance calculations, particularly over the cold regions.

关键词： precipitation gauge measurement bias correction cold region

Analysis on the decadal scale variation of the dust storm in North China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2005年第12期48卷 2260-2266页

作者： KANG Dujuan1,2.& WANG Huijun1 1. NZC/LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100871, China 2. Environmental Fluid Mechanics Laboratory, Stanford University, Stanford CA 94305, USA 1. NZC/LASG Institute of Atmospheric Physics Chinese Academy of Sciences 100871 Beijing China 2. Environmental Fluid Mechanics Laboratory Stanford University 94305 Stanford CA USA

In this paper, the temporal variation characteristics of the dust storm in North China are investigated. Based on power spectrum analysis and wavelet analysis, 1956-1970 and 1985-1999 are chosen as the high-frequency and low-frequency dust storm decades respectively. Analysis results clearly show that the spring and wintertime anomalous atmospheric circulation between these two dec-ades are significantly different. Compared with the former decade, there are a strengthened polar vortex, enhanced westerlies near 50°N, and a weak East Asian major though in the winter of the latter decade. The north and center parts of the Siberian high and the Aleutian low become weak. The southerly and easterly wind anomalies appear over the north and east parts of China, which implies the weakening of East Asian winter monsoon. Meanwhile, northern China experiences warmer winters and wetter springs, which are in favor of the weakening of dust storm intensity in North China. There are significant out-of-phase relationships between dust frequency and wintertime westerly intensity, as well as between dust frequency and Arctic Oscillation. It is also found that the frequency of dust weather is strongly re-lated to winter-springtime East Asian monsoon intensity.

关键词： dust storm, climate anomaly, decadal scale variability, East Asian monsoon, AO.

Three-dimensional decomposition method of global atmospheric circulation

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第3期51卷 386-402页

作者： LIU HaiTao1,2.3, HU ShuJuan4, XU Ming5 & CHOU JiFan6,7 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10002., China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3 Beijing climate center, Beijing 100089, China 4 Department of Mathematics, Lanzhou University, Lanzhou 730000, China 5 Shanghai Typhoon Institute, Shanghai 2.0030, China 6 Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China 7 China Meteorological Administration Training center, Beijing 100089, China 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate University of Chinese Academy of Sciences Beijing 100049 China 3. Beijing climate center Beijing 100089 China 4. Department of Mathematics Lanzhou University Lanzhou 730000 China 5. Shanghai Typhoon Institute Shanghai 200030 China 6. Department of Atmospheric Sciences Lanzhou University Lanzhou 730000 China 7. China Meteorological Administration Training center Beijing 100089 China

By adopting the idea of three-dimensional Walker, Hadley and Rossby stream functions, the global atmospheric circulation can be considered as the sum of three stream functions from a global perspective. Therefore, a m... 详细信息

关键词： three-dimensional decomposition of the global atmospheric circulation generalized Walker Hadley and Rossby stream functions existence and uniqueness vertical motion

Throughput Capacity of a Container Terminal Considering the Combination Patterns of the Types of Arriving Vessels

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2010年第1期15卷 124-128页

作者：丁以中 Logistics research center Shanghai Maritime University

The throughput capacity of a container terminal is very important in planning and designing at container *** existing methods estimated the throughput capacity without considering its change resulting from the different combination patterns of the types of arriving vessels.A simulation model is established to estimate the throughput capacities of a container terminal under different combination patterns of the types of arriving *** shows that the throughput capacity of a container terminal is influenced by the utilization rates of the berth and quay cranes which result from the different combination patterns of the types of the arriving *** provides a practical approach to estimate the throughput capacity of a container terminal considering the types of the vessels,and it is also helpful for the decision makers to raise the throughputs of the container terminals by optimizing the combination patterns of the types of arriving vessels.

关键词： simulation container terminal throughput capacity utilization rate of the berth