检索结果-南通市图书馆

CABOSFV algorithm for high dimensional sparse data clustering

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and {2. beijing 2004年第3期11卷 283-288页

作者： Sen Wu Xuedong Gao Management school, university of {2. and technology beijing, beijing 1.0083. china Mgmt. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

An algorithm, Clustering Algorithm Based On Sparse Feature Vector (CABOSFV),was proposed for the high dimensional clustering of binary sparse data. This algorithm compressesthe data effectively by using a tool 'Sparse Feature Vector', thus reduces the data scaleenormously, and can get the clustering result with only one data scan. Both theoretical analysis andempirical tests showed that CABOSFV is of low computational complexity. The algorithm findsclusters in high dimensional large datasets efficiently and handles noise effectively.

关键词： clustering data mining sparse high dimensionality

Water distribution extracted from mining subsidence area using Kriging interpolation algorithm

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 723-726页

作者： DAI Hua-yang, REN Li-yan, WANG Meng, XUE Hai-bing College of geosicence and surveying {2., china university of mining & technology, beijing 1.0083. china College of geosicence and surveying {2. China University of Mining & Technology Beijing 100083 China

By comprehensively analyzing the data of geology and mining, Kriging algorithm was introduced to analyze the thematic information of geological data, to rapidly extract mining parameters for predicting mining subsidence, and to effectively integrate geomorphology and predict information. As a result, the change information of water body is successfully detected from the prediction of surface subsidence due to mining activity. Analysis shows that the elevation of farmland in the west side of water body will be lower than ever, and the west part farmland will be submerged. However, there is no evidence for impacting the villages. All the information provides a reference for efficiently assessing environmental impact due to mining activity, which can help to govern the subsidence of the area reasonably.

关键词： Kriging interpolation water body mining subsidence prediction parameters data fusion

Effect of fretting amplitudes on fretting wear behavior of steel wires in coal mines

在线全文

学校读者我要写书评

暂无评论

mining science and {2. 2010年第6期20卷 803-808页

作者： SHEN Yan, ZHANG Dekun, GE Shirong school of Materials science and {2., china university of mining & technology, Xuzhou 2.1116, china [a] school of Materials science engineering China University of Mining & Technology Xuzhou 221116 China

Given that fretting wear causes failure in steel wires, we carried out tangential fretting wear tests of steel wires on a self-made fretting wear test rig under contact loads of 9 and 2. N and fretting amplitudes ranging from 5 to 180 μm. We observed morphologies of fretted steel wire surfaces on an S-3000N scanning electron microscope in order to analyze fretting wear mecha-nisms. The results show that the fretting regime of steel wires transforms from partial slip regime into mixed fretting regime and gross slip regime with an increase in fretting amplitudes under a given contact load. In partial slip regime, the friction coefficient has a relatively low value. Four stages can be defined in mixed fretting and gross slip regimes. The fretting wear of steel wires in-creases obviously with increases in fretting amplitudes. Fretting scars present a typical morphology of annularity, showing slight damage in partial slip regime. However, wear clearly increases in mixed fretting regime where wear mechanism is a combination of plastic deformation, abrasive wear and oxidative wear. In gross slip regime, more severe degradation is present than in the other regimes. The main fretting wear mechanisms of steel wires are abrasive wear, surface fatigue and friction oxidation.

关键词： steel wires fretting wear fretting amplitude fretting regime wear mechanism

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

在线全文

学校读者我要写书评

暂无评论

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,{2. university of mining and technology (beijing),beijing 1.0083.{2. 1. school of Chemical and Environmental engineering China University of Mining and Technology (Beijing) Beijing 100083 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,H2.2.NH3·H2. 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·H2. 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 H2.2.activated carbon (AC-H2.2. exhibit more complex *** their iodine numbers increase monotonously with activation *** with steam activated AC (AC-H2.),the nitrogen content increases 0.2.2. 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-H2..H2.2.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-H2.2.> *** 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-H2. 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

Spatiotemporal model of open-pit based on 3-D deposit model

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 616-620页

作者： XIA Chun-lin1, ZHOU Hui1, LI Qing-yuan2. MA Zhen-li3 1. school of geomatics, Liaoning Technical {2., Fuxin 12.000, china 2. State Key Laboratory for GIS engineering, Chinese Academy of surveying and Mapping, beijing 100830, china 3. Yinchuan College, china university of mining and technology, Yinchuan 750011, china [a] school of geomatics Liaoning Technical University Fuxin 123000 China [b] State Key Laboratory for GIS engineering Chinese Academy of Surveying and Mapping Beijing 100830 China [c] Yinchuan College China University of Mining and Technology Yinchuan 750011 China

A new method was put forward to make up the three-dimensional deposit model, and the spatiotemporal models of open-pit with temporal dynamics were also studied combined with the corrected models of multilevel ground states so as to bring the three-dimensional open-pit model at different time and its model serial formed from the evolvement into the management of temporal dimension in order to realize the spatial three-dimension and temporal dynamic for the mining management in open-pits,which makes this model easy to query and analyze 3-D information, also help surface mining replaying and stope evolution forecasting. Finally, the time-spatial model was established to show the dynamic mining on some open-pit under the windows XP and VC++ environment.

关键词： 3D model of deposit three-dimensional model mixed model temporal model open-pit

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

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and {2. 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, {2. of science and technology beijing, beijing 1.0083. china) Univ Sci & Technol beijing Civil & Environm Engn Sch Beijing 100083 Peoples R 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

Molecular mechanism of dehydrin in response to environmental stress in plant

在线全文

学校读者我要写书评

暂无评论

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 1.0083. china Department of Biology, Graduate university of Chinese Academy of sciences, beijing 100049, china) [a]Department of Bioengineering School of Chemical and Environmental Engineering China University of Mining and Technology (Beiing) Beijing China [b]Department of Biology Graduate University of Chinese Academy of Sciences Beijing 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.

Subsidence control and farmland conservation by solid backfilling mining technology

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 665-669页

作者： GUO Guang-li1, 2. FENG Wen-kai3, ZHA Jian-feng1, 2. 3, LIU Yuan-xu1, 2. WANG Qiang1, 2.1. Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping, china university of mining and technology, Xuzhou 2.1116, {2. 2. Jiangsu Key Laboratory of Resources and Environmental Information engineering, china university of mining and technology, Xuzhou 2.1116, {2. 3. State Key Laboratory of geohazard Prevention and geoenvironment Protection, Chengdu university of technology, Chengdu 610059, {2. [a] Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu Key Laboratory of Resources and Environmental Information engineering China University of Mining and Technology Xuzhou 221116 China [c] State Key Laboratory of geohazard Prevention and geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining technology, which decreases the height of fissure zone and caving zone, and alleviates the subsidence, is a new technology for farmland conservation. Based on the situation analysis of farmland destruction in mining area, three ways for farmland protection were proposed. In order to improve the feasibility of this technology, the limited filling materials should be used to increase resources recovery ratio, and then the surplus materials could be backfilled into goaf. An index, namely farmland conservation ability, was put forward to optimize the ways for farmland conservation. At last, the Wanbei coal mine was taken as a case for farmland conservation. It was shown that 32.0 t dull coal was substituted and 52.hm2.farmland was conserved by solid backfilling mining in this coal mine.

关键词： solid backfilling farmland conservation mining subsidence equivalent mining height

Research on the Long Time Swelling Properties of Poly (vinyl alcohol)/Hydroxylapatite Composite Hydrogel

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic engineering 2009年第1期6卷 22-28页

作者： De-kun Zhang~(1,3), Da-gang Wang~2. Jun-jie Duan~(1,3), Shi-rong Ge~(2.3)1. school of Materials science and {2., china university of mining and technology, Xuzhou 2.1116, P. R. china2. school of Mechanical and Electrical {2., china university of mining and technology, Xuzhou 2.1116, P. R. china3. Biotribology Center, National Key Laboratory of Tribology, Tsinghua university, beijing 1.0083. P. R. china [a]school of Materials science and {2. China University of Mining and Technology Xuzhou 221116 P. R. China [b]School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 P. R. China [c]Biotribology Center National Key Laboratory of Tribology Tsinghua University Beijing 100083 P. R. China

Poly(vinyl alcohol)/hydroxylapatite(PVA/HA)composite hydrogel was prepared by repeated freezing and *** water loss properties of the resultant hydrogel were investigated by using optical *** time immersion tests of PVA/HA composite hydrogel were carried out in the diluted calf serum solution to study the change laws of swelling properties with the freezing-thawing cycles and HA *** micro-morphologies of PVA/HA composite hydrogel after long time immersion were observed by means of the high-accuracy 3D *** results show that the swelling process of PVA/HA composite hydrogel is the converse process of its water *** time swelling ratio curves of PVA/HA composite hydrogel in the calf serum solution are manifested as four stages of quick increase,decrease,slow decrease and stable balance,and its equilibrium swelling ratio decreases with the increase of freezing-thawing cycles and HA *** is revealed that the network structure of the composite hydrogel immersed for a long period is significantly improved with the increase of HA content. Perfect network structures of PVA/HA composite hydrogel as well as full and equilibrium tissues after swelling equilibrium are obtained when the HA content is 3% and the number of freezing-thawing cycles is 7.

关键词： poly (vinyl alcohol) hydroxyapatite composite hydrogel swelling property morphology