检索结果-南通市图书馆

Development and Prospect of rare earth Functional Biomaterials for agriculture in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of rare earths 2006年第Z2期24卷 427-431页

作者：王甲辰刘向生杨军张赫刘营樊玉斌伍艳平韩学伟 national rare earth centre for agriculture General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co. Ltd.

The development and prospect of rare earth functional biomaterials (REFB) was discussed. From 1979 to 1985, the simple REFB (salts) has been developed, and the fundamental research including forms, effects, toxicity, conversion in soil, and analysis methods had been finished. Then, the RE feed additive materials had been developed, and the fundamental research had also been finished. In 1990s, new REFB including RE phosphate fertilizer additive, RE conversional agricultural film additive, RE water-retraining reagent and RE seed coating reagent had been developed out rapidly. They were extended to 1.36 million hectares and big benefit had been got during the last three years. Recently, it was found that RE has some function of antagonizing heavy metals and degradating organophosphors pesticide, so the REFB will be studied as a focus once more, and will become one of the important methods of guaranteeing food security in the future.

关键词： REFB antagonizing heavy metals degradating organophosphors pesticide rare earths

Refrigeration effect of La(FeCoSi)_(13)B_(0.25) compounds and gadolinium metal in reciprocating magnetic refrigerator

在线全文

学校读者我要写书评

暂无评论

Journal of rare earths 2013年第12期31卷 1163-1167页

作者：程娟刘国栋黄焦宏刘翠兰金培育闫宏伟 national Engineering Research centre of rare earth Metallurgy and Functional Materials Baotou Research Institute of Rare Earths School of Materials Science and Engineering Hebei University of Technology

The LaFe11.9–x Cox Si1.1 B0.25 with x=0.9 and x=0.82 compounds were synthesized from commercial purity raw *** magnetic property of LaFe11.9–x Cox Si1.1 B0.25 and Gd particles were tested on the reciprocating refrigerator at the same condition in order to compare the cooling capacity of the two *** results showed that the cooling velocity of Gd was obviously higher than that of LaFe11.9–x Cox Si1.1 *** maximum temperature span was 12.7 oC for LaFe11.0 Co0.9 Si1.1 B0.25,14.9 oC for Gd metal whose mass is the same as that of LaFe11.0 Co0.9 Si1.1 B0.25,8.1 oC for Gd metal whose volume is the same as that of LaFe11.0 Co0.9 Si1.1 *** connection of LaFe11.0 Co0.9 Si1.1 B0.25 and LaFe11.08 Co0.82 Si1.1 B0.25 had the maximum cooling temperature span of 15.3 oC.

关键词： magnetic refrigeration magnetic temperature span magnetic entropy change adiabatic temperature change rare earths

Application of rare earth Phosphate Fertilizer in Western Area of China

在线全文

学校读者我要写书评

暂无评论

Journal of rare earths 2006年第Z2期24卷 423-426页

作者：刘向生王甲辰杨军樊玉斌伍艳平张赫 General Research Institutes for Nonferrous Metals Grirem Advanced Materials Co.Ltd.National Rare Earth Center for Agriculture of China

rare earth phosphate fertilizer (REPF) as base fertilizer (750 kg per hm2) was applied in the western area of China during the 'Tenth Five-Year Plan' , and the results show as follows: compared with calcium superphosphate (CK), REPF increases crops yields for maize by 17.0% , for rice by 10.5% , for wheat by 24.2% , for potato by 18.5% , for cabbage by 16.3%, for Chinese cabbage by 16.4%, for beet by 6.5%; decreases the diseased plant rate for common smut of maize by 1.0%, for maize stalk rot by 1.2%, for wheat take-all disease by 7.8%, for wheat root rot by 3.2%, for potato blackleg disease by 1.4%, for potato late blight by 6.6%; increases the sugar content of beet by 0.9°S.

关键词： REPF yield diseased plant rate agricultural products rare earths

SYNTHESIS, CHARACTERIZATION AND STRUCTURE OF [Co（DBP）2·3Py]2·2CHCl3

在线全文

学校读者我要写书评

暂无评论

Science in China,Ser.B 1988年第10期31卷 1153-1165页

作者：黄春辉张德龙徐光宪章士伟 Research centre of rare earth Chemstry Peking University Institute of Physical Chemistry

The mixed ligand complex of cobalt with dibutylphosphate （HDBP） and pyridine has been synthesized. Elemental analysis yields the result that the formula of this compound is Co（DBP）2·3Py·CHCl3 （Py=pyridine）. The thermal analsyis, visible spectra and magnetic properties of it have been studied as well. Single crystal structural analysis shows that the crystal is triclinic with space group P and the unit cell parameters are as follows:a=14.490（10）, α=90.37（4）°,b=15.721（7）, β=96.04（5）°,c=20.109（12）, γ=105.63（4）°.The final R factor is 0.0773. Two Co atoms are connected by two bridging DBP groups to form a dinuclear molecule [Co（DBP）2·3Py]2 which has a Cs, symmetry. Each cell contains two dinuclear molecules and four chloroform molecules. The cobalt is coordinated in an octahedral arrangement by three oxygen atoms and three nitrogen atoms, of which one oxygen atom comes from a monodentate DBP group, two oxygen atoms from two bridging DBP groups, and the three nitrogen atoms from the three pyridi

关键词： cobalt HDBP pyridine complex structure.

Nano Lanthanum Oxide Preparation by Alkalescent Ammonium Citrate System and Its Primary Biological Effect

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of rare earths 2004年第6期22卷 913-916页

作者：王甲辰杨军刘向生黄小卫范玉斌伍艳平 Beijing General Research Institutes for Nonferrous Metals Beijing 100088 China national rare earth Center for agriculture Beijing 100088China Grirem Advanced Materials Co. Ltd Beijing 100088China

Using alkalescent ammonium(AAC)as precipitatnt, the diameter of nano La_2O_3 powder with diameter in 80 nm and less was prepared by the method of homogeneous precipitation, and reactant concentration, temperature and pH were studied and confirmed. The best precipitated concentration is from 0.2 to 0.5 mol·L^(-1), and the diameter of compounded powder turns small as the temperature gradually becomes high, and the pH from 6 to 8 is the best and the concentration of precipitant does not affect the diameter of compounded powder significantly. Meanwhile, most experiments lasting for fifty days in the greenhouse, and the results are 0.2 g·kg^(-1) nano La_2O_3 powder is enorgh for increasing biomass by 133% compared with that of the CK.

关键词： nano La_2O_3 alkalescent ammonium citrate homogeneous precipitation biological effect rare earths

Study on Function of rare earth During Producing Phosphate Fertilizer by Wet Process

在线全文

学校读者我要写书评

暂无评论

Journal of rare earths 2004年第Z1期22卷 261-264页

作者： Wang Jiachen Liu Xiangsheng Yang Jun Fan Yubin Wu Yanping Beijing General Research Instiutes for Nonferrous Metals 100088 BeijingChina National Rare Earth Center for Agriculture of China100088 BeijingChina Grirem Advanced Materials Co. Ltd. Beijing 100088China Beijing General Research Instiutes for Nonferrous Metals100088 BeijingChina National Rare Earth Center for Agriculture of China100088 BeijingChina Grirem Advanced Materials Co. Ltd. Beijing 100088China

The impacts of the rare earth (RE) on the contents of available Phosphorus (P) and the physical character of the calcium superphosphate produced by the wet process on the basis of simulating the consumption of concentrated sulphuric acid, the slurry concentration and the cure conditions in different wet process were studied in laboratory, and the results show that adding RE into different wet process does not raise available P, but changes its physical character,for example, the composite is loose and the color is offwhite.

关键词： rare earth phosphate fertilizer, wet process, physical characteristics, available P

Status of rare earths for agriculture in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of rare earths 2004年第Z1期22卷 313-316页

作者： Wang Jiachen Yang Jun Liu Xiangsheng Beijing General Research Instiutes for Nonferrous Metals Beijing 100088 China National Rare Earth Center for Agriculture of China Beijing 100088 China Grirem Advanced Materials Co.Ltd. Beijing100088 China

rare earths (RE) for agriculture is a very typical application and has already brought good economic benefit to Chinese agriculture and *** this paper, the origin, development, status and the future of RE for agriculture in China were ***, through the researches of RE in the fields of physiological activity, physiological and biochemical mechanism, sanitation toxicology and environment security in 1980's, RE has been extended more widely in agriculture, such as crops, vegetables, forest, wood grass and stock breeding, such as cattle, fish and ***, with using of new techniques that were developed in the "State Ninth Five-Year Plan", the utilization area of RE was expanded to broad agricultural space, such as sunlight converting plastic film, RE fertilizer, RE drought resistant and RE water saving materials and new RE top dressing ***, with the development of the nanometer materials, the techniques and process of nanometer RE materials were *** these kinds of materials, the new seed cover matters, new seed mixed matter and new nanometer fertilizer will appear in the near future, and will produce many updated techniques and improve a new round RE application in agriculture.

关键词： agriculture typical application origin development status

Glacial-interglacial productivity contrasts along the eastern Arabian Sea:Dominance of convective mixing over upwelling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2015年第6期6卷 913-925页

作者： Kumar Avinash Busnur R.Manjunath P.John Kurian earth System Science Organization National Centre for Antarctic and Ocean ResearchMinistry of Earth Sciences Department of Marine Geology Mangalore University

The western continental margin of India is one of the highly productive regions in the global *** productivity is induced by upwelling and convective mixing during the southwest and northeast monsoons *** the importance of high primary productivity,a sediment core was collected below the current oxygen minimum zone（OMZ） from the southwestern continental margin of *** was dated by AMS radiocarbon and as many as 60 paleoclimate/paceoceanographic proxies,such as particle size,biogenic components,major,trace and rare earth elements（REEs） which were measured for the first time to determine sources of sediment,biogeochemical processes operating in the water column and their variations since the last glacial cycle.R-mode factor analysis of comprehensive data indicates that the dominant regulator of paleoproductivity is the southwest monsoon wind induced *** paleoproductivity related factors identified are the marine biogenic component and biogenic detritus（as an exported component from the water column added to the bottom sediment）.All paleoproductivity components increased significantly during the marine isotope stage-1（MIS-1）compared to those accumulated from MIS-4 to *** second group of factors identified are the terrigenous sediments with heavy minerals like zircon and *** terrigenous sediment,in particular,increased during MIS-2 when the sea-level was lower;however,the heavy mineral component fluctuated over time implying pulsed inputs of *** diagenetic fraction and reducing component are the third group of factors identified which varied with time with increased accumulation during the MIS *** primary productivity along the southwestern continental margin of India seems to have been controlled principally by the upwelling during the southwest monsoon season that was weaker from MIS-4 to MIS-2,as relative to that during the *** contrast,increased glacial productivity noticed in se

关键词： Paleoproductivity Upwelling Convective mixing Terrigenous sedimentation Western continental margin of India

Progress of gaseous arsenic removal from flue gas by adsorption:Experimental and theoretical calculations

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 470-485页

作者： Xuelei Yan Qingzhu Li Xiaowei Huang Bensheng Li Shengtu Li Qingwei Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China national Engineering Research centre for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China national Engineering Research Center for rare earth Materials General Research Institute for Non-Ferrous MetalsBeijing 100088China

Because of its high mobility and difficult capture,gaseous arsenic pollution control has become the focus of arsenic pollution *** mainly exists in the form of highly toxic As_(2)O_(3)in the flue ***,removing gaseous As_(2)O_(3)from flue gas is of great practical significance for arsenic pollution *** gaseous As_(2)O_(3)on the surface of adsorbents by physical or chemical adsorption is an effective way to reduce the content of arsenic in the flue gas and alleviate arsenic *** the past few decades,various adsorbents have been developed to capture gaseous As_(2)O_(3)in the flue gas,and their adsorption mechanisms have been studied in ***,it is necessary to review the strategies of arsenic removal from flue gas by adsorption,which can inspire further *** on summarizing the morphological distribution of gaseous As_(2)O_(3)in the flue gas,this review further summarizes the removal of gaseous As_(2)O_(3)by several adsorbents and the effect of temperature and the main components of the flue gas on arsenic *** addition,the mechanism of arsenic removal based on adsorption in the flue gas is discussed in depth through theoretical calculations,which is the particular focus of this ***,prospects based on the present research state of arsenic removal by adsorption are proposed to provide ideas for developing effective and stable adsorbents for arsenic removal from flue gas.

关键词： Gaseous arsenic Flue gas Adsorption Theoretical calculation Mechanism