检索结果-南通市图书馆

中国有色金属学会会刊：英文版 1996年第4期6卷 31-34页

作者： Xu Chi Su Hang Chen Nianyi(Shanghai institute of Metallurgy,chinese academy of {3.,Shanghai 200050) ACAD SINICA SHANGHAI INST METSHANGHAI 200050PEOPLES R CHINA

ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦＳＴＲＵＣＴＵＲＥＯＦＭＯＬＴＥＮＤｙＦ_３－ＢａＦ_２－ＬｉＦＳＹＳＴＥＭＢＹＭＯＮＴＥＣＡＲＬＯＭＥＴＨＯＤ￥ＸｕＣｈｉ；ＳｕＨａｎｇ；ＣｈｅｎＮｉａｎｙｉ（Ｓｈａｎｇｈａｉ... 详细信息

ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦＳＴＲＵＣＴＵＲＥＯＦＭＯＬＴＥＮＤｙＦ_３－ＢａＦ_２－ＬｉＦＳＹＳＴＥＭＢＹＭＯＮＴＥＣＡＲＬＯＭＥＴＨＯＤ￥ＸｕＣｈｉ；ＳｕＨａｎｇ；ＣｈｅｎＮｉａｎｙｉ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｌ...

关键词： rare-earth fluoride molten salt computer simulation Monte Carlo method local structure

Influence of Neutral salts and pH on Exchangeable Acidity of Red Soil and Latosol Colloids

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2002年第1期12卷 81-88页

作者： ZHOU SHIWEI, ZHANG GANGYA and ZHANG XIAONIAN institute of Soil Science, the chinese academy of sciences, Nanjing 210008 (china) institute of Soil Science the Chinese Academy of Sciences Nanjing 210008

In the present work, the exchangeable acidity of a red soilcolloid and a latosol colloid at different pH during reacting withfour neutral salts was measured. The results show that theexchangeable acidity increased with increasing amounts of the neutralsalts added, and the relation between them was almost linear. Whenthe amount of the neutral salt added was lower than a certain value,the slop of the line was high, and the slop turned low when theamount exceeded that value, so there was a turning point in eachline. The addition amounts of the neutral salts for the turningpoints were affected by the cation species of the neutral salts, butpH had less effect on them. After the turning points occurred, theexchangeable acidity of the red soil colloid still graduallyincreased with the addition amounts of the neutral salts, but that ofthe latosol colloid did not increase any more.

关键词： exchangeable acidity latosol neutral salt pH

Impacts of human activities on water cycles in Haihe Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical sciences 1998年第3期8卷 105-109页

作者： LI Lijuan institute of Geography, chinese academy of sciences, Beijing 100101 china

This paper studies effects of human activities on water cycle in Haihe basin, focusing on the effects on the key elements of water balance and environmental issues caused by unreasonable water development and utilization. The water cycle system becomes closer than in nature with the river runoff decrease and evapotranspiration increase. River runoff reduction, groundwater over-exploitation, and water pollution have caused a series of environmental problems in the area. The main issues are river dried up, sedimentation and salt accumulation, groundwater depression, land subsidence, sea water intrusion, as well as water pollution. The author believes that the highest level of water development should below 50 percent as a whole. The best way to meet increasing water demands of human activities is to raise efficiency of water resources use. Meanwhile waste water discharge should be reduced through treatment and recycle technology.

关键词： impacts human activity water cycle Haihe basin

Selective protection of glycinebetaine on extrinsic polypeptides of PS Ⅱ particles

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1997年第20期42卷 1744-1748页

作者： HOU Caixia, XU Chunhe, TANG Zhangcheng and SHEN YunkangShanghai institute of Plant Physiology, chinese academy of sciences, Shanghai 20003., china Shanghai institute of Plant Physiology Chinese Academy of Sciences Shanghai China

PHOTOSYSTEM Ⅱ（PS Ⅱ） particles capable of O2 evolution contain D1, D2 transmembrane pro-teins, and three extrinsic polypeptides which are exposed to the outer aqueous phase with ap-parent molecular masses of 3., 23. 18 kD. The three proteins can be partially or totally re-moved by treating the PS Ⅱ membranes with high concentrations of salt or other methods,

关键词： glycinebetaine extrinsic polypeptides trichloroacetate NaCI.

THE ATOMIC WEIGHT OP INDIUM

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 1991年第5期2卷 407-410页

作者： Tsing Lien CHANG Department of Chemistry, Peking University, Beijing 100871 Ying Kai XIAO Qinghai institute of salt lakes, Academia Sinica,{3.

Five samples of the indium material were examined for the isotopic abundance, and no variation was found. The isotopic ratio R_(191/193. was precisely measured by thermal ionization mass spectrometry, yielding a new v... 详细信息

关键词： THE ATOMIC WEIGHT OP INDIUM In OP

Application of Low and Ultra-Low Pressure Reverse Osmosis Membranes to Water Treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 1998年第12期 66-71页

作者： Wen Ruimei (institute of Semiconductors, The chinese academy of sciences, Beijing 100083.

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｒｅｖｅｒｓｅｏｓｍｏｓｉｓ（ＲＯ）ｉｓａｐｒｅｓｓｕｒｅ－ｄｒｉｖｅｎｐｒｏｃｅｓｓｏｆｗａｔｅｒｆｌｏｗｉｎｇａｃｒｏｓｓａｓｅｍｉｐｅｒｍｅａｂｌｅｍｅ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｒｅｖｅｒｓｅｏｓｍｏｓｉｓ（ＲＯ）ｉｓａｐｒｅｓｓｕｒｅ－ｄｒｉｖｅｎｐｒｏｃｅｓｓｏｆｗａｔｅｒｆｌｏｗｉｎｇａｃｒｏｓｓａｓｅｍｉｐｅｒｍｅａｂｌｅｍｅｍｂｒａｎｅｆｒｏｍｔｈｅｓｏｌｕ...

关键词：河田川崎 Application of Low and Ultra-Low Pressure Reverse Osmosis Membranes to Water Treatment

THE ATOMIC WEIGHT OF IRIDIUM

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Chemical Letters 1992年第9期3卷 731-734页

作者： Tsing Lien CHANG Department of Chemistry,Peking University,Beijing 100871 Ying Kai XLAO Qinghai institute of salt lakes,Academia Sinica,{3. 810008

The isotopic ratio R_(191/193.of iridium in minerals and reagents was precisely measured by ther- mal ionization mass spectrometry with Daly ion *** mean R_(191/193.was found to be 0.5945(9), yielding the isotopic abundance as 3..29(3.atom％^(191)Ir and 62.71(3.atom％^(193.*** with known nuclidic masses,the atomic weight od iridium calculated therefrom is 192.216(1)at 2SD basis,or 192.217(2)when the instrument was calibrated with the absolute isotopic ratio of rhenium.

关键词： Mean THE ATOMIC WEIGHT OF IRIDIUM

Arbuscular mycorrhizal fungi infection in desert riparian forest and its environmental implications: A case study in the lower reach of Tarim River

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第8期18卷 983-991页

作者： Yuhai Yang, Yaning Chen *, Weihong Li Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang institute of Ecology and Geography, chinese academy of sciences, Urumqi 83.011, china Key Laboratory of Oasis Ecology and Desert Environment Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China

This study was conducted on the desert riparian forest along the lower reach of the inland Tarim River, which is located in the arid region of Northwest *** plant species in 10 families were collected from five monitoring sections,and examined for the infection of arbuscular mycorrhizal fungi (AMF). The impact of different soil factors on AMF infection rate and intensity was compared using the principal component analysis (PCA) method. The results indicate that 11 species are AM and only 4 are non-AM plants. The estimated capacity of AMF infection depends on families of plants and also the parameters (infection rate, infection intensity, fungal spore density) used. The density of fungal spores was relatively higher in Phragmites communis and Populus euphratica in Graminaceae and Salicaceae families, *** infection rate was above 50%in all the AM plants,except Calligonum *** highest infection rate appeared in Alhagi sparsifolia (97%) and Glycyrrhiza inflata (92%). However, when compared by AMF infection intensity, Tamarix spp. became the top one, followed by Alhagi sparsifolia, and Glycyrrhiza inflata was in the middle range of all the species. The PCA has identified that soil total salt, moisture, organic matter, total nitrogen, total P, available K and pH were closely associated with the AMF infection.

关键词： Arbuscular mycorrhiza Infection Ecological restoration Desert riparian forest Soil

A mathematical model for solid liquid and mass transfer coupling and numerical simulation for hydraulic fracture in rock salt

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第8期15卷 742-748页

作者： LIANG Weiguo 1,2* and ZHAO Yangsheng1(1. Mining Technology institute, Taiyuan University of Technology, Taiyuan 03.024, china 2. Rock and Soil Mechanics institute,{3., Wuhan 43.071, china) Mining Technology institute Taiyuan University of Technology Taiyuan 030024 China. Rock and Soil Mechanics institute Chinese Academy of Sciences Wuhan 43007! China

The hydraulic fracture in rock salt is a complicated solid fluid and mass transfer coupling process. Through theoretical analysis, a solid fluid and mass transfer coupling mathematical model of hydraulic fracture in rock salt is established in this work, and numerical simulations are carried out with the model. The simulation results indicate that rock salt cracks in the typical way of wing-crack(or tensile crack) during the fracture, and the relation of fracture aperture (w) with expanding distance (x) and fracture time (t) is w=(0.003.+0.0006t)e (0.0007+0.0018t)x. Furthermore, it has been found that both the water pressure in the crack and the expanding velocity of the crack decrease gradually as a result of the influence of salt dissolving during fracturing. These numerical simulations well illustrate the process of hydraulic fracture in rock salt and are significantly meaningful in engineering practice.

关键词： rock salt hydraulic fracture solid liquid and mass transfer coupling mathematical model numerical simulation.