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Overview of Theory and Model of Tropical Agricultural Circular Economy in Hainan Province

Asian Agricultural Research 2011年第5期3卷 119-122页

作者： YU Hua-mei1,2,GE Cheng-jun3 1.College of Economics and Management,Hainan university,Haikou 570208,china 2.school of chemical and environmental engineering,china university of mining and technology,beijing 100083,china 3.College of Environment and Plant Protection,Hainan university,Haikou 570208,china College of Economics and Management Hainan University school of chemical and environmental engineering China University of Mining and Technology College of Environment and Plant Protection Hainan University

This paper gives a general overview of rationale of tropical agricultural circular *** the basis of ecological economic theory,circular economy is a new model of economic development which aims at realizing reducing of resources use,reuse of products and recycling of wastes,conforming to the principle of *** is to make economic system melt into the process of cycle of material of natural ecological system *** paper introduces the advantages of developing tropical agriculture in Hainan Province,the main problems existing in the development and two main models of sustainable tropical agricultural development in Hainan Province at present.9 typical models of tropical agricultural circular economy in Hainan Province are listed in particular,including compound ecological project of forestry and animal husbandry,three-dimensional planting model of plantation,multilayered structure of eucalyptuses,sustainable agricultural model of sightseeing,the model of using animal manure,precision tropical agricultural model,clean production model of tropical agriculture,deep processing model of tropical agricultural products,and the model of ecological agricultural *** countermeasures and suggestions are put forward to promote development of tropical agricultural circular economy in Hainan Province as follows:take actions that suit local circumstances,exert advantage and exploit potential;give full play to advantage of integration of production,teaching and research,and promote agriculture by applying scientific and technological advances;the whole staff participate and strengthen construction of soft environment and hard environment.

关键词： Circular economy Tropical agriculture Sustainable

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Effect of activation agents on the surface chemical properties and desulphurization performance of activated carbon

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Science china(Technological Sciences) 2010年第9期53卷 2515-2520页

作者： ZHANG XiangLan,ZHANG Yan,WANG ShuangSheng,ZHANG JingJing & ZHOU Wei school of chemical and environmental engineering,china university of mining and technology (beijing),beijing 100083,china school of chemical and environmental engineering China University of Mining and Technology (Beijing) Beijing China

Flue gas pollution is a serious environmental problem that needs to be solved for the sustainable development of *** surface chemical properties of carbon have great influence on its desulphurization performance.A series of activated carbons (ACs) were prepared using HNO3,H2O2,NH3·H2O and steam as activation agents with the aim to introduce functional groups to carbon surface in the ACs preparation *** ACs were physically and chemically characterized by iodine and SO2 adsorption,ultimate analysis,Boehm titration,and temperature-programmed reduction (TPR).Results showed that the iodine number and desulphurization capacity of NH3·H2O activated carbon (AC-NH3) increase with both activation time,and its desulphurization capacity also increases with the concentration of activation ***,HNO3 activated carbon (AC-HNO3) and H2O2 activated carbon (AC-H2O2) exhibit more complex *** their iodine numbers increase monotonously with activation *** with steam activated AC (AC-H2O),the nitrogen content increases 0.232% in AC-NH3 and 0.077% in *** amount of total basic site on AC-HNO3 is 0.19 mmol·g-1 higher than that on AC-H2O.H2O2 activation introduces an additional 0.08 mmol·g-1 carboxyl groups to AC surface than that introduced by steam *** desulphurization capacity of ACs in simulate flue gas desulphurization decreases as follows: AC-NH3 > AC-HNO3 > AC-H2O2 > *** sequence is in accord with the SO2 catalytic oxidation/oxidation ratio in the absence of oxygen and the oxidation property reflected by *** the presence of oxygen,all adsorbed SO2 on ACs can be oxidized into *** desulphurization capacity increases differently according to the activation agents;the desulphurization capacity of AC-NH3 and AC-HNO3 improves by 4.8 times,yet AC-H2O increases only by 2.62 as compared with the desulphurization of corresponding ACs in absence of oxygen.

关键词： activated carbon activation agent surface chemical property desulphurization TPR

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Molecular mechanism of dehydrin in response to environmental stress in plant

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Progress in Natural Science:Materials International 2007年第3期17卷 237-246页

作者： ZHANG Yuxiu , WANG Zi and XU Jin (Department of Bioengineering, school of chemical and environmental engineering, china university of mining and technology (beijing), beijing 100083, china Department of Biology, Graduate university of Chinese Academy of Sciences, beijing 100049, china) Department of Bioengineering School of Chemical and Environmental Engineering China University of Mining and Technology (Beijing) Beijing 100083 China. Department of Biology Graduate University of Chinese Academy of Sciences Beijing 100049 China

Dehydrins, known as the D-11 subgroup of late embryogenesis abundant (LEA) protein, are an immunologically distinct family of proteins, which typically accumulate in desiccation-tolerant seed embryo or in vegetative tissues in response to various environmental stresses such as drought, salinity and freezing. The existence of conservative sequences designated as K, S, and Y segments is a structural feature of dehydrins, and the K segment found in all dehydrins represents a highly conserved 15 amino acid motif (EKKGIMDKIKEKLPG) and forms an amphiphilicα-helix. According to the arrangement of these domains and clustering analysis, dehydrins are subdivided into 5 subtypes: YnSK, Kn, KnS, SKn and YnK. Different types of dehydrins are induced by different environmental stress in plants. Study results showed that dehydrins might play important protective roles under abiotic stress via a number of different mechanisms, including improving or protecting enzyme activities by the cryoprotective activity in responding to freeze/thaw or dehydration; stabilizing vesicles or other endomembrane structures by function as the membrane stabilizer during freeze induced dehydration, and preventing the membrane system from the oxidative damage induced by reactive oxygen radicals as the radical scavenger. Here, the gene expression and molecular mechanisms of dehydrin in response to stress in plants are discussed.

关键词： dehydrin stress mechanism.

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Preparation, characterization and salt-resistance of a coal based super absorbent composite

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mining Science and technology 2010年第6期20卷 864-871页

作者： CHU Mo, HUANG Zhanbin, XU Bang, FANG Tao, DUAN Hui school of chemical and environmental engineering, china university of mining & technology, beijing 100083, china school of chemical and environmental engineering China University of Mining & Technology Beijing 100083 China

Potassium humate was extracted from brown coal. A novel super absorbent composite, poly （acrylic acid-co-acryla- mide）/potassium humate （PAA-AM/KHA）, was prepared by graft polymerization of acrylic acid, acrylamide and coal based potassium humate using N, N＇-methylenebisacrylamide as a crosslinker and potassium peroxydisulfate as an initiator. The effects of reaction temperature, degree of neutralization of the poly （acrylic acid） and the amounts of crosslinker, initiator and potassium humate were investigated. Salt resistance tests were also carded out. The composite prepared under optimal conditions had a potassium bumate content of 10% and exhibited a water absorption of 770 g/g in distilled water, and 349, 286 and 41 gig in 0.5 mol/L KC1, MgC12 and A1CI3 solutions respectively. The results indicate that the salt resistance of PAA-AM/KHA was superior to that of poly （acrylic acid-co-acrylamide） because of the collaborative effect of functional groups of the coal based potassium humate. The PAA-AM/KHA micro powder was characterized by IR spectroscopy and the micrographic surface was characterized by scanning electron microscopy. Introduction of potassium humate into the poly （acrylic acid-co-acrylamide） structure creates a composite more suitable for use as a water-managing material in the renewal of arid and desert environments. The salt resisting property of the composite is improved, production costs are reduced and the growth stimulant effect is still present.

关键词： brown coal coal based potassium humate superabsorbent salt-resistant property

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Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

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Science china(Technological Sciences) 2009年第1期52卷 204-209页

作者： DU GaoXiang1,3, ZHENG ShuiLin2 & DING Hao1 1 school of Materials Science and technology, china university of Geosciences (beijing), beijing, 100083, china 2.school of chemical and Environment engineering, china university of mining and technology (beijing), beijing 100083, china 3 Hebei Qinghe Refractory Group Co. Ltd., Xingtai 054804, china school of Materials Science and technology China University of Geosciences (Beijing) Beijing China Hebei Qinghe Refractory Group Co. Ltd. Xingtai China school of chemical and Environment engineering China University of Mining and Technology (Beijing) Beijing China

Silica is the major component of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. Compared to the high temperature reaction method, this process is environmental friendly and low cost. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 26.4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the leaching ratio of SiO2 is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. Under the optimum conditions, the leaching ratio of the SiO2 is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major components of the alkali leaching residue are serpentine, talc, quartz and some albite.

关键词： asbestos tailing acid leaching residue sodium hydroxide process optimization

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Phylogenetics and biogeography of eastern Asian–North American disjunct genus Pachysandra (Buxaceae) inferred from nucleotide sequences

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Journal of Systematics and Evolution 2009年第3期47卷 191-201页

作者： 1Zhihua JIAO 2,3Jianhua LI 1(school of chemical and environmental engineering, china university of mining and technology, beijing 100083, china) 2(The Arnold Arboretum of Harvard university, Cambridge, MA 02138, USA) 3(Adjunct Faculty of College of Life Sciences, Zhejiang university, Hangzhou 310029, china) (school of chemical and environmental engineering China University of Mining and Technology Beijing 100083 China) (The Arnold Arboretum of Harvard university Cambridge MA 02138 USA) (Adjunct Faculty of College of Life Sciences Zhejiang University Hangzhou 310029 China)

Pachysandra is an eastern Asian-North American disjunct genus with three species, two in eastern Asia (Pachysandra axillaris and Pachysandra terminalis) and one in eastern North America (Pachysandra procumbens). Although morphological and cytological studies suggest a close affinity of P. procumbens with P. axillaris, molecular data from nuclear and chloroplast DNA regions have provided conflicting signals. In this study, we tested previous phylogenetic hypotheses using sequences of nuclear ribosomal DNA internal transcribed spacers and chloroplast ndhF gene from multiple individuals of each of the three species. We also estimated the time of divergence between eastern Asia and eastern North America. Our results support the morphological and cytological conclusion that P. procumbens is more closely related to P. axillaris than to P. terminalis. The estimated time of divergence of P. axillaris and P. procumbens was 14.6±5.5 mya, consistent with estimates from many other eastern Asian-North American disjunct genera. The migration of Pachysandra populations from eastern Asia to North America might have occurred by way of the North Atlantic land bridge.

关键词： Buxaceae divergence time ndhF nrDNA ITS Pachysandra.

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Feasibility Study on Continuous mining Method in Deep Position of Jinchuan Nickel Mine, china

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Journal of university of Science and technology beijing 2001年第2期8卷 81-85页

作者： Meifeng Cai, Lan Qiao, Changhong Li, Shuanghong Wang (Civil and environmental engineering school, university of Science and technology beijing, beijing 100083, china) Civil and Environ. Eng. school University of Science and Technology Beijing 100083 China

Jinchuan nickel mine is the largest nickel mine in china. Cut-and-fill mining method with high density cementing materials is used in the mine. The original mining design divided the mining operation into two steps. The first step stopped the mining rooms and the second step stopped the pillars. Because the two-step method made big trouble for finally mining pillars and strongly limited the mining speed and production, it was successfully changed to a continuous cut-and-fill method without pillars. However, the mining operation in the mine has been down to 800 m and the mining condition is getting worse and more complicated. Through systematical field investigations and 3-D FEM analysis, it is proved that the mining method without pillars is feasible for mining deeper orebodies in Jinchuan nickel mine.

关键词： Jinchuan nickel mine deep position continuous mining feasibility study

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Synthesis of Zeolites by Alkaline Activation of Fly Ash

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Journal of university of Science and technology beijing 2001年第3期8卷 161-163页

作者： Hua wang, Qiang Zhang, Cunyi Song, Fengmei Liu Civil and environmental engineering school, university of Science and technology beijing, beijing 100083, china Civil and Environ. Eng. school Univ. of Sci. and Technol. Beijing Beijing 100083 China

In terms of mineral transformation, and chemical composition of acid-soluble component as a function of reaction time, the effect of alkaline solution on zeolite-like fly ash was studied by employing fly ash and NaOH solution as starting materials. When fly ash and 1-10 mol/L NaOH solution were processed at 100 degreesC for 24 h with 1:10 W/S ratio in a relatively closed system, powder XRD patterns of resulting products indicated the formation of various zeolites. Zeolite P crystallized early at low alkaline concentration, which was replaced then by zeolites X and A. At high concentration, hydroxy sodalite was the only new phase. Quartz, in fly ash and NaOH solution system, gradually dissolved, and mullite, however, remained stable. It was concluded that, with Al/Si and Na/Si finally reaching equilibrium in molar ratio, composition of starting mixtures affects the crystallization of zeolite from fly ash.

关键词： fly ash alkaline solution zeolite

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Prediction of Rock Burst with Deep mining Excavation in Linglong Gold Mine

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Journal of university of Science and technology beijing 2001年第4期8卷 241-243页

作者： Meifeng Cai, Jinan Wang, Shuanghong Wang Civil and environmental engineering school, university of Science and technology beijing, beijing 100083. china Civil and environmental engineering school University of Science and Technology Beijing Beijing 100083 China

To predict rock burst in deep mining excavation in Linglong gold mine, systematical laboratory tests of mechanical properties of rock, in situ stress measurement and 3-D FEM analysis on energy distribution in rock mass surrounding deep mining rooms were carried out. According to various prediction criteria of rock burst, it is concluded that rock burst is liable to occur during deep mining excavation in the mine.

关键词： rock burst prediction deep mining excavation Linglong gold mine

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environmental benefits of underground coal gasification

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Journal of environmental Sciences 2002年第2期14卷 284-288页

作者： LIU Shu qin, LIU Jun hua, YU LI (china university of mining & technology, beijing 100083, china. （北京）中国矿业大学北京 100083

environmental benefits of underground coal gasification are evaluated. The results showed that through underground coal gasification, gangue discharge is eliminated, sulfur emission is reduced, and the amount of ash, mercury, and tar discharge are decreased. Moreover, effect of underground gasification on underground water is analyzed and CO 2 disposal method is put forward.

关键词： environmental benefits coal underground coal gasification

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