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March 30,2012
Volume 5,Issue 6
Pages -
Subject Area:Aerial Photogrammetry,Geodesy,Geographic Information System,Bioenergy,Coal Mining

Title: A method of making stack image based on radar image couples

Authors: ZHANG Junan, ZHANG Jixian, DENG Kazhong
PP: 585-590
Abstract: Radar remote sensing is different from the conventional optical remote sensing which is visual and intuitionistic, it is nonfigurative and tracks record of the signal of objective. Radar image is abstract, so it is difficoult to interpret.Based on the mechanism and characteristic of radar imaging, the article introduces two means of creating the “stack” SAR image, then by quoting the RADARSAT-2 radar image of MDA company, this article validates that the “stack” SAR image can be interpreted easily. The effect is also obvious when applying this conclusion to the forest inspect、 mine monitor、 area which is unfrequented and so on.
Keywords: remote sensing information engineering; synthetic aperture radar; stack image; change detection

Title: Analysis on positioning accuracy of network RTK of different distances over the mid-latitude zone

Authors: ZHANG Haining, LIU Chao, SUN Jiuyun
PP: 578-584
Abstract: For providing a basis for users of continuously operating reference stations (CORS) and government or company who wants to establish CORS, the network differential positioning technology based on virtual reference station (VRS) was discussed. Meanwhile, the dispersive and non-dispersive errors were modeled and a running average method was applied to obtain smooth non-dispersive correction. Then, the integer ambiguity of L1 carrier-phase measurements was resolved, and the dispersive and non-dispersive errors were eliminated. On this basis, the main error sources and positioning accuracy of network RTK of different distances over the mid-latitude zone were analyzed, and fifteen stations in three different regions of the national geodetic survey-CPRS (NGS-CORS) were used to conduct a test. The results confirm that distance-dependent errors increased and correlation of errors in different stations and positioning accuracy decreased based on distance increased. In addition, the positioning accuracy can reach 1-2 cm and 2-4 cm, when baseline is less than 60 km and within the size of 60-90 km respectively.
Keywords: geodesic measurement; virtual reference station; global position system; dispersive errors; non-dispersive errors

Title: Implementation solution of offline map browsing

Authors: YU Ying, GUO Yanhui, XU Guoai
PP: 571-577
Abstract: Currently, Online map services can’t adapt to the office environment without network connection, and have lower data accessing efficiency and user experience degrees. Based on the research of the current mainstream open-source framework of map services, this paper implements offline map service by selecting ArcGIS framework to load Google Maps tile maps and taking Flex technology for the first time as the implementation for offline map browsing solution. The solution owns five major advantages: offline advantages, performance advantages, cost advantages, showing advantages and flexibility advantages.
Keywords: geographic information system; offline map service; Flex; tile map

Title: Research on delimiting urban ecological control-line based on discrete particle swarm optimization

Authors: CHEN Minghui, OU Jinpei, LIU Xiaoping
PP: 559-570
Abstract: This paper presented a model of auto generation of ecological control- line based on discrete particle swarm optimization (DPSO). DPSO is a kind of improved optimization algorithm, not only inheriting the advantages of traditional particle swarm algorithm, but also solving the problem of discrete space optimization effectively. And it is very suitable for searching and processing the discrete and mass data. In this study, the status, including urban land-use, the slope, the elevation and normalized differential vegetation index (NDVI) etc was firstly acquired with the advantages in remote sensing and geographical information systems (GIS). And then the suitability data of ecological protection area was obtained by using a multi-criteria method, which was further taken into the model to get an optimized pattern after repeated iteration. Afterward, this proposed model had been applied in Dongguan, a city in the Pearl River delta. Through comparing with the other methods, this proposed model is proved that it can effectively generate a continuous, compact, optimizing ecological control-line designated scheme, which could provide decision support for relevant departments.
Keywords: geographical information systems; urban ecological control-line; discrete particle swarm optimization; spatial optimization

Title: Application of gasometry data in identification of gas bearing reservoirs in low porosity & permeability reservoirs

Authors: CHENG Daojie, WANG Hui, LINGHU Song
PP: 555-558
Abstract: Difference in logging response between gas bearing reservoirs and water bearing reservoirs is little in L-N area, which makes it is impossible to distinguish them with normal interpretation method. This paper attempts to find out the features of gas bearing reservoirs and water bearing reservoirs with gasometry data. Frequently-used interpretation methods for hydrocarbon bearing reservoirs with gasometry data are investigated and surveyed. The mapping relationship between gaseous hydrocarbon of gasometry and gas/water bearing reservoirs is set up, while training and identification is done with artificial neural network (ANN) consequently. It works effectively in identification of gas/water bearing reservoirs, which complements the identification work of the hydrocarbon bearing reservoirs with logging data.
Keywords: mineral resource prospecting and exploration; gasometry data; gaseous hydrocarbon; identification of gas bearing reservoir; artificial neural network

Title: Research on short-term forecast of wind speed on wind farm based on chance theory

Authors: TAN Ping, ZHAO Shuqiang
PP: 547-554
Abstract: Because of the influence of the various environmental factors, the natural wind has strong uncertainty. The result of the traditional short-term forecast method of wind speed is single value, and the forecast result usually can not meet the accuracy requirement. Aimed at the shortcomings of traditional short-term wind speed forecast methods including low accuracy, difficulty in forecasting the wind speed tendency and so on, this paper carries out the filtering to the history wind speed of the short-term wind speed forecast based on the character of the wind speed change and then the forecast, and analyzes the result accuracy of the forecast algorithm. This paper also puts forward the theory that extends a single forecast result value to a forecast result section, discusses the statistical property of the wind speed wave motion, and analyzes the character of the forecast result with chance theory. At last the paper puts forward the chance vector to assess the character of the forecast result value, illustrates that chance vector method will enhance the reference value of short-term wind speed forecast result with the example.
Keywords: calculation and survey of energy sources; short-term wind speed forecast; mean filtering; chance theory; wind speed wave motion; chance vector

Title: Rewards, punishments and feedback strategy applied in supply chain of biomass energy

Authors: WANG Zhe, ZHANG Yong
PP: 541-546
Abstract: It can make the biomass supply chain management more coordinate by combining with contract mechanism, and achieve the purpose of the maximum profit. Basing on the “base and farmer” supply chain model, the paper brought in rewards, punishment and feedback strategies which provided theoretical basis for selecting optimal quantity of biomass materials. Then present practical calculation assuming specific parameters getting validation. The results showed that rewards, punishment and feedback strategies can ensure the feedstocks of biomass energy tending to supply steadily as well as guarantee the whole supply chain to own the maximum profit.
Keywords: bionnergy; biomass supply chain; incentives and feedback; base and farmer; level of effort

Title: Analysis on composition of oil production and evaluation on final recovery of Beisandong block

Authors: ZHANG Jicheng, LAN Jinyu, SONG Kaoping
PP: 535-540
Abstract: The east of Beisan block of Sabei developing area is located in the Saertu pure oil field of Changyuan, Daqing, which belongs to river-delta depositional system. The sand and mud are distributed interactively, and the heterogeneity is very serious. For further improving the development effect of the reservoir and compiling and adjusting the development scheme, based on the production data of Beisandong simulated domain, the existed problem is analyzed. Firstly, analysis from the production composition shows that the decreasing amplitude becomes much larger after the third round infill drilling. Secondly, through comparing the alpha water flooding law curve of flooding pattern of the wells including the third round infilling wells and that of pattern of the wells not including the third round infilling, it is found that the third round infilling wells do not improve the recovery of target area.
Keywords: oil and gas field development engineering; the third round infilling well; composition of oil production; recovery

Title: Research on Ar gas technology condition of AZO thin film by magnetron sputtering

Authors: SONG Ruiliang, LIU Wei, SUN Yun
PP: 530-534
Abstract: Magnetron sputtering Al-doped zinc oxide (AZO) thin film is the main method for industrial fabrication of large area thin film solar cell. With different inlet modes of Ar gas in sputtering process, the AZO thin films showed the nonuniform phenomenon obviously that the thickness of thin film was larger in the middle than the side, the occlusion of Ar gas inlet could make some influences on the peak position of thickness. The reason was that the pressure distribution on the top of target is nonuniform. This paper analyzed this phenomenon by the means of experiment and simulation, which would establish the theoretical foundation for the large area uniform thin films fabrication by sputtering.
Keywords: solar energy; icroelectronic; magnetron sputtering; fluid simulation; zinc oxide

Title: Analysis of main influencing factors on running resistance coefficient of belt conveyer

Authors: HUANG Wei, LIU Yinglin
PP: 525-529
Abstract: For the design and calculation of belt conveyer, running resistance coefficient influences the value of belt tension and motor power directly. In this paper, the influencing factors of the main running resistance of belt conveyer are analyzed, and the running resistance coefficient varying with circumstances is gotten. And the variation trend of running resistance coefficient under the influence of several possible factors is analyzed.
Keywords: mining transport machinery; belt conveyer; running resistance; resistance coefficient

Title: Finite element analysis of coal cutter pick based on LS-DYNA

Authors: LI Chunying, WEI Chunmei, ZHOU Siquan
PP: 521-524
Abstract: To further deepen the understanding of the coal cutter pick cutting, and to provide theoretical support for optimization of coal cutter drum, the three-dimensional model for pick was established. Using the empirical formula of cutting, the three-way cutting resistance suffered by the pick was plotted with the Matlab software, which was loaded on the pick head. Through stress analysis of the conical pick of a coal cutter by finite element analysis software LS-DYNA, the stress distribution law in their actual cutting process was understood, and time and location is gotten when the maximum stress appearing. The results can lay the foundation by further improving the cut teeth’s stress state, falling off, and wrecking.
Keywords: mining machinery; coal cutter; pick; finite element analysis; stress

Title: Practical research on feeding process at the end of the fully mechanized mining face

Authors: BAI Yunlin
PP: 516-520
Abstract: Through comparison of the inclined cut feeding process at the end of coal winning machine on fully mechanized working face between traditional teaching materials and actual operation, it is fully understood that due to the higher request in the project quality management and the quality standardization, the feeding process at the end of coal winning machine has been adjusted correspondingly for the actual practice. This paper used the language description and graphical comparison to make the difference of the inclined cut feeding process at the end of coal winning machine on fully mechanized working face between traditional teaching materials and actual operation be more easily understood and to provide some guidance for the actual work.
Keywords: mining engineering; coal mining; feeding process; fully mechanized working face; different processes; graphical comparison

Title: Elastic-plastic analysis of circular surrounding rock masses under the action of seepage

Authors: GAO Zhaoning, SUN Zhenping, MENG Xiangrui
PP: 507-515
Abstract: The paper assumes that the rock mass material properties kept unchangeable in a sufficiently small region. The rock mass is divided into some plastic rings. Basing on the plane strain condition, the unified strength theory is applied, combining with the rock strain-softening mechanic model and the post-peak strength of rock and deformation evolution law, the zonal disintegration is gotten in circular surrounding rock masses under the action of the seepage. Mechanical behaviors of a circular tunnel elastic zone, plastic-softening zone and ruptured zone have been analyzed under the action of the seepage. Through comparing the influence factors of the range of the plastic zone under the conditions with/without the plastic zone under the action of seepage, it’s obtained that the especially remarkable influence factors on seepage under the action of the plastic area are the supporting pressure, tunnel radius and mining depth. The data show that the result analysis is increasingly close to reality with considering the seepage; it also demonstrates a real change of the surrounding rock damage. The results provide a theoretical base for the optimization of the underground engineering support design and safety evaluation.
Keywords: mineral engineering; seepage; plastic zone ring; strain softening; zonal disintegration

Title: Studies on the ash declining and quality improving of depressant in flotationof difficult preparation of high ash coal slime

Authors: LI Jihui, MA Liqiang, GUI Xiahui, CHENG Gan, WANG Qiang
PP: 502-506
Abstract: This paper discusses the causes that give rises to the high ash content in the high ash and difficult prepared slime floatation, and introduces the mechanism and effect of depressant in the coal slime floatation. A series balance experiments are performed under the same condition with water glass, sodium haxametaphosphate and caustic amylum as various depressants. The results show that sodium haxametaphosphate has the best depressant effect in them. Under the conditions that the ash of the feed is 22.87%, the does of sodium haxametaphosphate is 1 500 g/t, the ash of cleaning coal falls by 1.05 percentage points, and its recovery rate rises by 5.52 percentage points than the common floatation without depressants.
Keywords: mineral separation technology; difficult preparation of high ash coal slime; flotation; depressant; ash declining and quality improving

Title: Research progress on application and modification of mineral materials used as papermaking fillers

Authors: WANG Li, ZHUANG Chunyan, LIU Cong, MENG Deqin, FANG Jie
PP: 496-501
Abstract: The rapid development of papermaking industry results in an increasing demand for the plant fibers. In order to reduce the costs of raw materials, cut down the consumption of timber and optimize composition of raw materials, mineral based materials which used as papermaking fillers were systemically studied in this paper. The basic properties and application status of mineral fillers such as the natural inorganic fillers, artificial mineral based fillers, silicate fillers and the other special fillers were summarized, and the main processing methods were also briefly introduced. The necessity of chemical modification on these fillers was put forward due to the ubiquitous fact that the binding strength between mineral fillers and pulp fibers was poor. Modification technologies such as precipitation-coating modification with carbohydrates, polymer linking-flocculation modification, inorganic modification and coupling agent modification were comprehensively described in this paper. The development prospects and industry application of papermaking fillers were also predicted.
Keywords: mineral materials; papermaking filler; processing method; modification technology; development prospect

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