bluuebunny/crossref_metadata_2025 huggingface dataset:
The Combined Effects of Salinity and Water Stress on the Growth and Yield Quality of Tomato
Authors: Guo Xiang Ping , Tackmore Murava Raphinos , Obai Kargbo , Salahou Mohamed Khaled
Published: March 2013

The effects of two soil salinities (1g/kg and 6g/kg) and two water stress levels (60% and 80% of the field capacity) on growth and yield parameters of Meiguo903 tomato were investigated under greenhouse conditions. A randomized complete block design experiment with three treatments and four replications was conducted. The treatments were defined as: CK (no water stress and no salt stress), T1 (no water stress but salt stress) and T2 (water stress and salt stress). The results show that more water was applied in CK than the other treatments, but T2 saved water by about 10%. Measured growth parameters showed that water stress and salinity affected the height and stem diameter of the plants. In general, T2 had short plants with thin stems, T1 had a little taller and thin stems while CK had tall plants with thick stems. It was found that both salinity and water stress has a significant effect on total marketable yield. T1 reduced the yield by 37% while T2 conditions reduced the yield by about 43%. Comparing T1 and T2 which were subjected to the same saline conditions (but different water stress levels), there is a significant difference on the amount of water used, where T1 is the highest, but there is no significant difference on their yield. These results give the conclusion that, in a saline environment, water stress can save water and produce a yield close to that when full irrigation is applied. Nearly optimum yields can be achieved by proper water stress management in such an environment.
Recursion for Capturing Leaf Mass
Authors: Wang Chao , Zhang Shu Ying , Meng Wei Lin , Si Hui
Published: March 2013

By using the recursive method, the total mass of the leaves for the whole tree is determined by the small parts of the trees. On the basis of summarizing the growth law of the tree, and assuming the shapes, branches and leaves of the tree follow its growth law, the mass measurement model is established, and the mass of the leaves in the highest-level branch is estimated by establishing the mass equations of the leaves. The variables in this model are the crown width, the crown height, the branch angle and the number of branches on each level per unit length. The parameters of this model are easy to obtain, and the extension of this model will push the establishment of database for various relative parameters. Moreover, it is found that there exists a certain relationship between tree shape index and leaf index, thus a new leaf classification method is proposed, and its description is carried out.
Survival and Germination of Overwintering Oospores of Phytophthora infestans in the Field
Authors: Li Ji Ping , Li Min Quan , Hui Na Na , Wang Li , Ma Yong Qiang , Qi Yong Hong , Li Jian Jun , Li Qing Qing , Zhou Tian Wang
Published: March 2013

Survival and germination of overwintering oospores of two strains from Gansu,China compared with two standard from Wageningen, the Netherlands of Phytophthora infestans were determined in 2010-2011. It was found that compatible mating strains of P. infestans A1 and A2 produce oospores abundantly in paired cultures on tomato-rye agar medium.The survival rate of overwintering was ranged from19.57% to 24.59%.The germination rate of overwintering was ranged from 3.58% to 8.49%, and there were no significant differences in germination rate of oospores between alternating light at day/night and whole darkness at day/night. Furthermore, the soil extract liquid was more suitable for oospore germination than distilled water.
Engineering Simulation on Forest Carbon Balance under Different Tree Configuration Mode
Authors: Guo Yue Feng , Wu Li Zhi , Yao Yun Feng , Qin Fu Cang , Qi Wei , Li Gang Tie
Published: March 2013

From a greenhouse gas policy standpoint, forests play an extremely important role in the exchange of carbon dioxide between the land and atmosphere. Because forest management has a potentially large effect on the entire forest carbon (C) cycle, and the biological and industrial systems are tightly coupled in the North region of China, simulation of varying management and forest product production scenarios are needed to explore trade-offs of managing forests for multiple objectives. Thus, an important consideration in management of forests is their present and future capacity to sequester C from the atmosphere. In this paper, C balance of the biological system was simulated under different management scenarios that were designed to test effects of plant configuration.
The Study of Cadmium, Zinc, Lead on Plant Growth Influence
Authors: Qian Jin Ping , Duan Guo Bing , Luo Yan
Published: March 2013

This study selected 16 families and 20 genera 20 species of garden plant as the research object, and through pot experiment, study the influence of cadmium, zinc, lead on plant growth, determine the content of heavy metal in the plant organs, determine the ability of heavy metal enrichment to different plants, in order to provide scientific basis through repairing the soil use these plants and configurating the garden plant reasonable.
Absorption and Distribution of Heavy Metal in Erigeron breviscapus (Vant) Hand-Mazz
Authors: Xiong Hua Bin , Chen Ming Hong , A Xin Xiang , Chen Meng Sheng , Chen Yu Cheng , Li Yu
Published: March 2013

Heavy metal accumulation is effect normal plant growth, and brings potential human health risk in edible and medicinal plants. Erigeron breviscapus is a famous and important traditional China medicine plant, but research of absorption and accumulation for heavy metal is very limited, however that will help the guarantee of quality and food safety as medicine, and offer cultivation guidance and selection of main medicinal parts. The results showed that in pollution-free soil four heavy metals (lead, chromium, cadmium and cuprum) are low concentration in Erigeron breviscapus, but with an increase of heavy metal concentration in soil its amount showed a rising trend in different organs. Lead and chromium enriched mainly by plant root, but cadmium and cuprum easily transfer into above-ground parts because of strongly translocation ability themselves. Therefore cultivate of medicine materials must select pollution-free soil to avoid direct and indirect danger from heavy metal pollution.
GIS Based Spatialization of Population Data in Meijiang River Basin
Authors: Zeng Xiang Gui , Lai Ge Ying , Yi Fa Zhao , Zhang Ling Ling
Published: March 2013

This paper used GIS spatial analysis and data processing technologies and multi-source data fusion technology to spatialize the population data of Meijiang river basin. Land use was selected as the index factor and the settlements as the indicative factor. Selected terrain, roads and rivers were the main influencing factors and were further classified into several sub-factors. During the simulation, we first calculated the weight indexes of sub-factors on the settlements distribution and then fused the indexes to calculate the weight indexes of the main factors. Second we calculated the weight indexes of settlements on the population distribution. Last we fused the weight indexes of the main factors and the weight indexes of settlements to obtain the population density indexes of whole region and then generated the 100m×100m resolution raster population density map.
Reservoir Capacity Measurement and its Curve Preparation Based on DEM
Authors: Chen Lin , Zhou Yi Fu , Liu Jian Feng , Yang Zhong Hua
Published: March 2013

A precise and reliable basic data is an important for flood control and management for each reservoir, especially DEM. The topographic map above water surface can easily be digitized based on GIS technology. The underwater digital elevation model (DEM) was measured integrated with GPSRTK technology and precision shallow water echo sounder. Therefore, DEM overall reservoir area can be built by integrating these two results. Using the methods of this paper, the reservoir capacity can be automatically generated, reservoir storage capacity table can be automatically prepared, and reservoir capacity curve can also be automatically drawn. The applications in the Guxian and Baisha Reservoir show that this method is simple and feasible.
The Study of Biodegradation Kinetics of Starch Based on Coating in Controlled Released Fertilizer (CRF)
Authors: Abdul Rahman Nurul Haniza , Razali Radzuan B. , Binti Mansor Nurlidia
Published: March 2013

The aim of this study is to prepare a starch film and analyze its characteristics in different pH condition. Starch has been given great attention and has been actively investigated to be used as coating materials for CRF because of its degradation properties. Once the analysis on the starch characteristics is completed, the reaction rate of the starch can be developed by using Michaelis-Menten equation as reference. The results of the reaction rate are important to help determine the biodegradation kinetics of the starch. It will also assist in determining the conditions needed to produce the starch film in order to reduce the release rate of fertilizer. Throughout this study, the biodegradation kinetics of starch film will be investigated and thus providing a reference for the selection of coating material for the application of CRF while improving agriculture production.
The PD Pattern Characteristics of Typical Defects in GIS Based on Acoustic Detection
Authors: Wu Xu Tao , Ma Bo , Hao Jin Peng , Zhang Liang , Li Jun Hao , Li Yan Ming
Published: March 2013

Gas insulated switchgear (GIS) is the most important equipment in the power system. The partial discharge (PD) is the main detection method for the insulation failure. Especially, for insulation condition assessment, the pattern recognition technology of partial discharge in GIS is the most important. Acoustic detection of GIS PD is the effective method and it has long application history. The acoustic detection method is very suitable for defects detection in GIS, for it has the advantages of on-line detection and easy realization of locating the defects.The PD pattern characteristic is the key factor for the analysis of defect type. The PD pattern characteristics of four typical defects in GIS based on acoustic detection are studied in this paper. The results provide a test basis for the recognition of PD types and a deeper study of the mechanism of PD.
New Method for Polygonous Node Automatic Creation Based on Triangulation
Authors: Xu Jia Xing , Li Gang , Wang Ji Yao , Li Xue
Published: March 2013

According to the concept and function of polygonous node, the authors depicted that the key of methods of making polygonous node is that a node corresponding to a polygon is one by one. On the basis of analyzing the available algorithms, the method of automatic creation polygonous node based on triangle is proposed. Compared with the traditional algorithms, This method is easy and workable, high efficiency and confirmative, ensuring the creation of one by one relation between polygonous node and polygon without considering various special cases. For polygon interior of the complex polygon is off-center, the modified algorithm has some improvement, especially for convex polygons, the effect is obvious. In the process of planar vector graphics to raster graphics conversion, the author have used the above algorithm, completed each polygon area filling, and achieved the desired effect.
Effects of Simulated Acid Rain on Soil Respiration of Pinus massoniana
Authors: Wang Nan , Bai Shang Bin
Published: March 2013

In order to understand the impact of acid rain on soil respiration of P. Massoniana, a field study with 3 simulated acid rain levels (pH2. 5, 4. 0 and 6. 0) were conducted. Measurement of soil respiration was made using a LI-8100 soil CO2 emission system, the soil temperature at 10 cm depth also was recorded. Results show that: (1) The soil respiration of P. Massoniana under different acid rain levels fluctuated with distinct seasonal patterns and the soil respiration rate was influenced significantly by soil temperature. The mean rate of soil respiration under pH2.5 level were 1.79μmol m-2s-1, and increased 16% under control level (pH6.0) respectively. The mean rate of root respiration under pH2.5 level were 1.03μmol m-2s-1, and increased 12% under control level (pH6.0) respectively.(2) Significant relationships between soil respiration and soil temperature at 10 cm under different acid rain levels of P. massoniana found, which could be best described by exponential equations. The regression equations had more predicative capability than those using only temperature as a single independent variable. (3) The Q10 (temperature sensitivity coefficient of soil respiration) values at pH2.5, 4.0 levels of P. Massoniana were 1.40, 2.05, respectively. Compared with which at control level, the Q10 values tended to increase.
Evaluation on the Suitability of Projects Linked to the Increase/Decrease in Urban and Rural Construction Land
Authors: Yang Jin , Wu Ya Xian , Xia Chao
Published: March 2013

An indicator system is established for the suitability of projects linked to the increase/decrease in urban and rural construction land based on the field surveys for the old areas to be dismantled in three administrative villages such as Niulandian Village, Tianjiagou Village and Nanchongsi Village of Tianchi Town in Lezhi County of Sichuan Province, and the fuzzy comprehensive evaluation method is used to evaluate indicators. The analysis of evaluation results provides reference for the efficient implementation of projects linked to the increase/decrease in urban and rural construction land.
Quality Supervision Evaluation of Agent Construction Projects in Construction Stage of GIP
Authors: Wu Yun Na , Wang He Ping , Zhang Shuo , Li Ze Zhong
Published: March 2013

The Government investment project (GIP) plays an important role in national economy in China. This paper introduces the Agent Construction System (ACS), focuses on the supervision problems of construction agent quality management in GIP. It proposes a self-control evaluation model for construction agent based on Rough Set Theory to confirm the key supervising points, and provides a agent supervision method for government. By questionnaire survey, forms an information system of the evaluation. A heuristic attribute reduction algorithm is applied in the reduction of index attribute, and then it uses the theory of attribute importance in discernibility matrix to determine the index weight. Implement reduction in quality self-control points by using MATLAB.
Study on Spatial Distribution of Soil Nutrients and Comprehensive Evaluation of Nutrients in Low Mountain-Hilly Region of Sichuan Province, China
Authors: Xiao Jiu Jin , Ma Hong Xing , Lu Chuang Tai
Published: March 2013

It is generally accepted that to overuse fertilize can led to cause fertilize resource waste, increase agriculture production cost, reducing the quality of agricultural products, and cause agricultural non-point source pollution. Determining soil nutrient distribution is critical to identify sites which are at risk of N, P and K nutrition loading. In order to know the soil nutrition spatial distribution and to determine agricultural rational fertilization, a total of 98 soil samples from the plow layer (0-20 cm) were collected in low mountain-hilly region of Sichuan Province, China. Spatial variability and distribution of soil organic matter (SOM), total N (TN), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) in agricultural soils were studied using geographic information system (GIS) software. And the analytical hierarchy process (AHP) was used to determine the weight of indexes by using quantitative analysis.
Study on Sustainable Use of Land Based on Ecological Footprint Model: a Case of Shenzhen
Authors: Ou Guo Liang , Tan Shui Kui
Published: March 2013

Reasonable use of land or not, directly related to the sustainable development of a country or region. This paper introduced the basic concept, calculation formula and method of the ecological footprint. We calculated the ecological footprint of Shenzhen by application of the ecological footprint model. The results showed that the per capita ecological footprint in Shenzhen in 2011 was approximately 2.486 hm2, while the per capita ecological capacity was approximately 0.0597 hm2, the per capita ecological deficit was approximately -2.433 hm2, and the ecological footprint is about 47.33 times greater than the ecological capacity. Finally, we discussed the limitations of applying the ecological footprint model to judge the sustainable use of land in this paper.
Analysis of the Main Factors of Vegetable Circulation Efficiency in Beijing Based on the Analytic Hierarchy Process
Authors: Jiang Peng , Zhou Lian Di , Ren Ai Sheng
Published: March 2013

For the characteristics of numerous populations, low self-sufficiency rate of vegetables, this article studies how to improve the supply ability of vegetables in Beijing by enhancing vegetable circulation efficiency. In this paper, we rank the weights of factors which are calculated by the analytic hierarchy process (AHP) in vegetable circulation, analyze the main factors in the evaluation results, and then provide the methods of solving problems.
Layout Planning and Evaluation Method of Urban Passenger Transport Station
Authors: Wang Zheng Yu , Jia Yu Wen , Jia Hua Fei , Li Cheng Bing
Published: March 2013

It is an effective method of planning transport station rationally to ease the increasing serious traffic problems in recent years. Firstly this paper puts forward stations’ optional methods. Secondly, it provides the latest evaluation index and reduces some redundant indexes by applying rough set theories, which improves the efficiency of scheme selection. Again, by introducing decision makers’ index sensitive function to correct index weight, it makes the multi-attribute decision making process reflect the dynamic changes of the decision makers’ preference indexes, and make up for the existing traffic plaza operation the shortage of the evaluation system. Finally, it establishes a model by the application of extension theory for solving the optimal scheme, which provides a new way of thinking and methods for our traffic station layout plan.
Research on the Planning Methods of Integrated Urban Passenger Transit Network
Authors: Li Cheng Bing , Tian Jun Li , Jia Hua Fei , Jia Yu Wen
Published: March 2013

In order to alleviate the low efficiency utilization of public transportation resources in the urban traffic of our country, the paper is put forward to analyze the planning methods of integrated passenger transit network, which gives an emphasis on the efficient cohesion, coordination and transfer between different modes of transportation, as well as gives a consideration to the urban development planning and the program of land layout. With a large number of data and field investigation, the paper found that we should give full consideration to the related indicators and set a goal function, then match each O-D point to choose the appropriate sections and appropriate means of transportation, and thus establish the model of a bi-level programming and the corresponding bi-level iterative algorithm in the urban passenger transit network planning of integration. Finally the model will be applied to the city’s passenger transport, and the various indexes before and after the project will be compared in order to test whether model established is correct or not.
Grain Potential Productivity of Cultivated Land in Baoji, Shaanxi Province, China
Authors: Li Tuan Sheng , Wu Hao Hao , Zhao Hong Zhi
Published: March 2013

The natural quality index and the utilization quality index in agricultural land classification are essentially two kinds of grain potential productivity, which, we name natural potential productivity and utilization potential productivity of cultivated land respectively. Based on this, we calculated the natural potential productivity and utilization potential productivity of cultivated land in Baoji. Both of them are 980.336×104t and 587.299×104t respectively. The natural potential productivity per unit area is 26.905t/hm2 and the utilization potential productivity per unit area is 16.118t/hm2. The natural potential productivity of Chencang District is 172.956×104t, the maximum, that of Taibai County 10.744×104t, the minimum. In terms of the utilization potential productivity, that of Fengxiang County is 105.033×104t, the maximum, and that of Taibai County 6.795×104t, the minimum. But natural potential and utilization productivity per unit area of Fufeng County are 37.954t/hm2 and 25.011t/hm2 respectively, the maximum, and those of Linyou County 11.672 t/hm2 and 7.095t/hm2 respectively, the minimum.
Control of Tectonic on Sedimentation in A’nan Depression, Erlian Basin
Authors: Li Zi Nan , Zhou Lu Lu , Liu Jun Gang
Published: March 2013

A’nan depression is faulted lake basin and control of its tectonic activity on the type characteristic of sedimentary facies, the sediment conduit and the capacity distribution of sandbodies can be summarized mainly as follows: (1) the area of sediment accumulate is in the thrown side of growth fault, with the high accommodation, meanwhile, the changes of sedimentary facies are caused by the differences of accommodation in the two sides of fault in the condition of stable source supply; (2) the accommodation zones between faults have low area, which can be a conduit from source area to depression area; (3) the distribution of sedimentary facies is controlled by ancient uplift that can block or change the direction of sediment transport. In other ways, the ancient uplift is as secondary sources during lower stand.
Fluvial Facies Sequence Stratigraphy and its Application to Oil Exploration
Authors: Li Jin Hua
Published: March 2013

It is considered that discussion on adaptability of sequence stratigraphy in fluvial sedimentation is significant for oil exploration. As the main controlling factor is the sea-level fluctuations in the coastal river system, Exxon sequence stratigraphy can be applied to divide the sequences into: lowstand, transgressive and highstand systems tracts. And in the inland fluvial system, the application of low- and high-accommodation systems tracts may keep more coincident with the actual stratigraphic record. From the Exxon stratigraphy to low- and high-accommodation systems tracts, each model will be of great value in the petroleum exploration because of the lateral phase transition raised and the vertical phase transition predicted. However, controlled by many allogenic processes, fluvial strata still shows many problems in which the patterns can not be clearly explained. Thus, fluvial sequence stratigraphy needs to be further developed. Researching on various models of fluvial facies sequence stratigraphy in the development process will bring the important theoretical and practical value to the oil reservoir exploration.
Types of Hydrocarbon Migration Pathways and Hydrocarbon Accumulation in the Yakela Fault-Convex, Tarim Basin
Authors: Luo Xiao Long , Tang Liang Jie
Published: March 2013

The existence of abundant hydrocarbon has been discovered in the Yakela Fault-convex, Tarim Basin, after reconstructing and superimposing for several periods. Through interpretation of 3D seismic data up to date, combined with the circumferential field geology, after comprehensively analyzing the characteristics of development on hydrocarbon migration passages and its relationship with hydrocarbon accumulation, this paper holds that it is divided into fault type, unconformity type and carrier bed type in the Yakela fault-convex. The unconformities and the carrier beds are the main lateral migration passage of gas and oil for long distance. The faults are the main vertical migration pathway of hydrocarbon, and the hydrocarbon can arrive at any strata with fault. It is significant to know the hydrocarbon migration pathways in the study area for exploration in future.
Analysis of Controlling Factors of Fuyu Reservoir Accumulation in Zhaoyuan-Taipingchuan Area
Authors: Wang Chen
Published: March 2013

In the past decade, no geological research has been done in Zhaoyuan-Taipingchuan area. The research and understanding on the area is still in 1990s and far away from meeting the needs of exploration. What has to be done now is to further analyze the accumulation factors from points-view of tectonic characteristics, tectonic division and tectonic controlling over sedimentation. Deeper understanding on fault-lithology and lithology hydrocarbon reservoir is especially important for favorable hydrocarbon zone evaluation and target zone selection. Taking these into account, accumulation factors are briefly introduced in the article.
Influencing Factors of the Young’s Modulus of Anthracite Coals
Authors: Li Jun Qian , Liu Da Meng , Yao Yan Bin , Cai Yi Dong
Published: March 2013

In this paper, the influencing factors of the Young’s modulus of coals were investigated by measuring the stress-strain behaviors under different confining stress and water ratio conditions and constituents for 13 anthracite coal samples obtained from the southern Qinshui basin of China. The results show that: (1) For a coal, its Young’s modulus increases in the form of convex increasing parabolic curve with increasing confining stress acting on the coal but reduces with increasing water ratio in the form of convex decreasing parabola. (2) The Young’s modulus of coals is negatively proportional to fixed carbon and vitrite contents; while it positively related to inertite content. The Young’s modulus of coals becomes remarkable when ash yield is of larger than about 11%. The coals with 60% vitrinite and 40% inertinite contents have the maximum Young’s modulus.
Sand Bodies Quantitative Research from the Northern Putaohua Reservoir in Songliao Basin
Authors: Yuan Hong Qi , Hou Zhuo Ran , Zhao Hui , Chu Tian Tian
Published: March 2013

Based on the data of core, well log, mud log and regional geology, the different type of sandbody was studied quantitatively on the northern Putaohua reservoir in Songliao basin by using the following indicators, they are average thickness, thickness standard deviation, thickness skewness, thickness peakedness, width, width to thickness ratio, length, length to thickness ratio, channel divaricating angle α, channel divaricating normal angle β. And then the sandbody distribution characteristics for different sedimentary face were studied in detail.
Research of the Stability of Tailing Dam under Earthquake
Authors: Fei Wei Shui , Zhang Zhi Yun
Published: March 2013

The seepage field of tailings pond is analyzed. Based on the result distribution of hydraulic head and velocity in the dam body, seismic analysis is carried out for the tailings pond in steady flow state. Three seismic waves are input and the safety factors of dam under seismic action are also achieved. The results show that the safety factor will decrease 0.3~0.4 with the seismic intensity increase one degree. The results provide some information on seepage and dynamic stability evaluation of tailings dam.
Study Underground Old Slope Activation and Influences on Environmental Safety Induced by Open Pit Mining
Authors: Sun Shi Guo , Wang Chun Sheng , He Yan Yan , Xu Xiu Ming
Published: March 2013

The long-term ground severe deformation and destruction induced by open pit and underground mining can badly affect the safety of surrounding environment. This problem is different from ground deformation and destruction induced by single mining. Based on chronological relationship between two kinds of mining and its corresponding deformation law under a practical engineering, the main reasons for long-term deformation and the deformation mechanism were revealed in this paper. Starting with the displacement mechanism, a method of horizontal movement coefficient was put forward to distinguish the movement property. Therefore, the impacts on two components of displacement vector can be distinguished, and then the basis for the proper analysis of ground deformation would be reached. At the same time, the ground deformation zone and the failure zone caused by subsequent open pit mining would be predicted, and the range of the failure zone would be gotten, providing a basis for safety decision.
Statistical Value of Soil Dynamic Parameters in Bohai Seafloor
Authors: Lan Jing Yan , Lu Yue Jun , Peng Yan Ju
Published: March 2013

Dynamic shear modulus ratios and damping ratios of soil are the parameter of indicating dynamic nonlinearity of soil, and the necessary parameter of seismic site analysis. The 372 pairs of soil samples’ dynamic nonlinear parameters, which were tested by dynamic tri-axial tests in about 40 the seismic safety evaluation reports of ocean oil platforms in the Bohai Sea, were collected and corrected. The dynamic shear modulus ratios and the damping ratios of various soil types with different depth in the Bohai seafloor were calculated and their statistical mean values were obtained. The statistical mean values are reasonable and are the important supplements in case that the tested soil samples are not enough in the Bohai Sea sites.
Prediction Methods and Practice of Surface Movement and Deformation in Goaffilling Mining
Authors: Hu Hua Bin , Hu Hai Feng
Published: March 2013

Based on the layout and geological conditions in 10203 test mining face of Gaoyang mine, This paper analyzed the three major factors influencing effects of filling mining that can be summarized as Fulfilling ratio, and goaffilling mining subsidence is expected to be full-span falls method of using calculating mining height prediction method, which provides a new approach for mining under buildings in the future.
Research on the Occurrence Mechanism and Evaluation of Coal Mine Accidents
Authors: Zeng Qi , Wu Yan Yan
Published: March 2013

Based on the analysis of the coal mine accidents dangerous sources and essential factors of occurrence mechanism, the coal mine accidents causation model is built by combing with system security theory and dangerous sources theory. This paper analyzes a large number of accidents causation factors and screens the main factors; finally the coal mine accidents hierarchical structure model is constructed. What’s more, combined with examples, the fuzzy analytic hierarchy process is applied to evaluate the accidents causation analysis.
Study on the Terminal Line Reasonable Position of Two Coal Seam under the Down-Protective Layer Pressure-Relieved Mining
Authors: Zhang Xiang Yang , Tu Min
Published: March 2013

In order to study the stress distribution and its dynamic influence law while the protective layer mining, based on the transfer law of mining-induced stress in the coal seam floor and in front of the working face, using numerical simulation software to simulate the surrounding rock stress under the different pillar width mining conditions, and carried through the roadway deformation engineering practice observations. It is shown that reserved 110m coal pillar could weaken the impact on the front of the floor tunnel under the protective layer mining process. When the top liberated layer mining to reduce the impact of mining stress superposition, it should avoid the terminal lines on the two coal seams at the same location and may be staggered at least about 30m ~ 50m. And it obtained that the roadway deformation not only by mining impact, but also considering the geological environment surrounding rock conditions, tunnel position in which layers of rock, rock properties and other factors. The research guided the engineering practice successfully.
The Current Situation and Developing Trend of Extremely Thin Coal Seam Mining of China
Authors: Zhang Li Ming
Published: March 2013

Degree of mechanization of extremely thin coal seam mining is growing, with introducing the main mining method currently used by the different inclination of the extremely thin coal seams in China, focusing on the different mining technology and related ancillary mining equipment development status and existing problems, and discuss the extremely thin coal seam in the future to realize the remote control, automatic monitoring and unmanned mining development trend.
Dynamic Analytical Platform for Mine Ventilation Networks
Authors: Li Kun , Ding Cui , You Chang Fu
Published: March 2013

Mine disasters frequently occur with serious consequences, so additional research is needed to effectively deal with mine disasters especially the secondary catastrophes. Modularization modeling method was used to develop the dynamic analytical platform for modeling mine ventilation networks. The platform includes models of the ventilation network and the control systems. A small experimental ventilation network was also constructed to validate the platform. The results show that the platform provides accurate real-time simulations of normal operations and accident conditions in the ventilation network. The platform accurately models dynamic spreading of the disaster in the lab with errors of around 5%. Thus, the platform can be used to analyze the mine ventilation systems during accidents and develop methods to prevent the secondary catastrophes and the deterioration of mine disasters.
An Organizational Social Responsibility Approach for Improving Mine Safety and Health in China
Authors: Li Zhong Xue , Zu Bing Hui , Zhao Yi Qing , Li Cui Ping , Cao Zhi Guo
Published: March 2013

The paper aims at presenting an organizational social responsibility approach for improving mine safety and health in China. Through an in-depth comparative analysis of the regulatory mechanisms for mine safety and health in USA and South Africa, it is found that the successful performance of mine safety and health in USA has been contributed by the triangle of effective law enforcement, advanced technology development and qualified labor training, and the impressive improvement of mine health and safety in South Africa has been attributed to the mechanism of tripartite engagement through the state, mine owners and employees. In view of findings from the US and South Africa experiences, an approach of organizational social responsibility through multi-stakeholders is proposed for China to fundamentally improve its performance of mine safety and health by adopting best practices.
Research on Predictive Model of Gas Concentration for Driving Ventilation in Coal Mine Based on Neural Network
Authors: Gong Xiao Yan , Guo Jun , Yan Dong Hui , Wu Zhe , Xue He
Published: March 2013

In order to predict accurately gas concentration in driving ventilation process under different gas emission and different ventilation scheme conditions in coal mine, based on the analysis of various ventilation factors, the prediction model structure of gas concentration of driving ventilation was designed based on RBF neural network in this paper. Then MATLAB software and the observation data obtained from the coal mine sites were used to establish and test the prediction models of gas concentration in driving ventilation process based RBF. And then the better accuracy and performance prediction model based on RBF were obtained through testing and comparative analysis. Finally, the prediction model of gas concentration was applied to forecast gas concentration of heading face under different driving ventilation equipment layout and configuration parameters in the actual coal mine and then confirm the reasonable effective and energy-saving driving ventilation equipment layout and configuration parameter scheme. The research results can provide a certain theory basis for dynamics prediction of gas concentration and ventilation scheme optimization in the driving ventilation process.
Beneficiation Test Research on High Grade Hematite-Limonite Ore
Authors: Guo Yan Hua , Dai Hui Xin , Yang Jun Long
Published: March 2013

The run of mine ore grade of Gan Shang Yan is 47.83%, iron ore grade is higher, but harmful element sulfur and impurity silica content is relatively high. This experiment using a simple process low intensity magnetic separation-high gradient magnetic separation, for the ultimate index for comprehensive grade of iron concentrate is 58.41%, at a total recovery of 80.85%, and obtain good experiment index, the harmful elements and impurity content can meet the standard.
Recovery of Copper from Sulfide-Oxidized Copper Ore by Flotation
Authors: Wu Ning , Ye Guo Hua , Tong Xiong
Published: March 2013

The copper mine is the sulfide-oxidized copper ore. The grade of copper is 0.5%, with the oxidation of 22%. According to the properties of the ore; a systematic study was did for the ore, include collectors, activators and grinding fineness. Under the optimized conditions, copper concentrates grade of Cu 16.56% with a recovery of 85.62% was obtained through the locked cycle flotation of twice roughing, four times cleaning, once scavenging and middling return in order.
Distribution Features of Multi-Phase Flow in DTB Crystallizer
Authors: Jiang Peng , Wang Xue Kui , Fang Bao Liang , Sha Zuo Liang
Published: March 2013

The multi-scale features are the foundation of the inner laws existing in the multi-phase flow process. Computational fluid dynamics (CFD) method was used to study the inhomogeneous distribution and multi-scale features of the solid particles in DTB crystallizer. Suspension and flow field distributions of the particles under different stirring speed and different particle diameter were observed. The result showed: the higher the stirring speed, the smaller the particle diameter and the more homogeneous the suspension distribution. The inhomogeneous distribution of the particles in the crystallizer was mainly caused by vortex. The particle concentration was much lowers in the vortex center, meanwhile, the higher the stirring speed, the more the particles and vortex number, the vortex strength getting greater as well.
The Method for the Characterization of Carlin Trend Gold Ores
Authors: Jiang Mei Guang , Liu Quan Jun , Yang Jun Long , Xiao Hong
Published: March 2013

Carlin Trend gold ores are often refractory by conventional cyanid, for a number reasons:1) the gold is locked up within host sulfide minerals such as pyrite or arsenopyrite; 2) the ore contains carbonaceous compounds which are preg-robbing; 3) the gold is locked up in silicate minerals. An alternative technique called diagnostic leaching, originally developed by the Anglo American Research Laboratories in South Africa, has been used successfully to distinguish between a wide variety of different gold associations, including the proportion of preg-robbing gold in carbonaceous gold ores.
Fault Signals Drawn from Strong Interference Signals in Mineral Well Based on Least-Square Wavelet Transform
Authors: Yu Sheng Chen , Xue Yang , Sun Li Min , Mei Qun Li , Zhang Lian Jun , Guo Hui , Wang Xiao Ju
Published: March 2013

A novel wavelet transform — the least-square transform is proposed in the paper, which is used to extract weak fault signals from strong interference signals in coal mineral well. With the help of the least-square transform, a smooth fault signal curve can be got from the fault signal with high noise. Strong interference signals in the coal mineral well give a so serious problem on the work of general electric investigation that sometime process of observing useful fault signal cannot be finished. For extracting the weak effective fault signals from strong interferences signals in coal mineral well, original measured signals are decomposed by the least-square transform wavelet transform proposed in the paper, and the weak effective fault signals are extracted successfully. Experimental results show that the approach method is feasible and efficient.
An Investigation of the Structure and Gasification Reactivity of Char
Authors: Wang Pei , Zhu Wen Jian , Bai Yong Hui , Li Fan
Published: March 2013

The Yining char samples were prepared in following conditions that raw coal particle size was in range 5-6mm and pyrolysis final temperature was 900oC, 1000oC and 1100oC, respectively, with a heating rate 20oC/min under atmospheric pressure. The gasification reactivity of chars was performed by thermogravimetric analysis (TGA) at 900oC in steam, CO2 and steam/CO2 mixture, respectively. The results show that the gasification reactivity of chars decreases with the increasing of pyrolysis final temperatures and there is synergistic effect between steam and CO2 during co-gasification that influences the char reactivity. The reason may be explained by char structure change, which FTIR showed that –CH3 and –O–CH3 decreased and even disappeared and XRD analysis suggested that the thickness of microcrystalline Lc, the values of microcrystalline diameter La and the aromatic of char fa became larger with increasing pyrolysis temperature.
A Model with Back-Propagation Algorithm for Recovery Efficiency Forecast of Carbon Dioxide Flooding
Authors: Ma Ping Hua , Fan Hong Fu , Li Ke
Published: March 2013

As one of the most important displacements in producing petroleum, CO2 flooding has been developed for nearly 50 years around the world in order to improve the tertiary recovery. The recovery efficiency, R, is a key parameter in the CO2 displacement of crude oil. Traditionally, R is determined by conducting CO2 flooding experiment, requiring considerable resources and long time periods, with the consequence of a limited number of core plug evaluations for a particular reservoir. Thus, the estimation of R with mathematical models is developed in recent years, which also needs plenty of relevant parameters considered. The study reported in this paper uses artificial neural network to determine R. Five dimensionless variables are considered to analyse the CO2 immiscible displacement process. An optimal model is chosen with its suitable hidden layer nodes and activation functions for the hidden and output layers. Its performance is compared with the numerical simulation model, demonstrating the superior performance of the proposed R prediction model.
Research on Carbon Source Effect of Guangxi Typical Carbonate Rock Area by Acid Rain
Authors: Yu Shi , Yang Hui
Published: March 2013

In order to have an insight into the reaction between acid rain and carbonate rock surface, and figure out the CO2carbonate source amount from the acid rain chemical weathering process of the carbonate rocks, two typical carbonate rock areas Guilin (represents limestone area) and Liuzhou (represents dolomite area) were chosen as the study areas in Guangxi. According to the dissolution rate calculated by the limestone test piece and GIS analysis, the CO2source produced by the acid rain was 41.066×108g/a, in which Guilin was 33.349×108g/a and Liuzhou was 7.717×108g/a. The carbon sources of unit area in Guilin and in Liuzhou were 66.967×105g/a•km2 and 42.777×105g/a•km2 respectively. Although the carbon sources were still less than their carbon sinks in Guilin and Liuzhou which were 273.891×105g/a•km2 and 43.660×105g/a•km2 respectively, they should not be neglected. There were two reasons that the degassing rate of carbon source in Guilin was slower than that in Liuzhou. One was the representative area of carbonate rock in Guilin were 2.77 times of that in Liuzhou, the other one was that the total intensity of acid rain of Guilin was lower than Liuzhou, so that the dissolution rate of the carbonate rocks was lower in Guilin.
Optimization of Superheated Steam Huff and Puff Wells Sequence in Heavy Oil Reservoir
Authors: Xu An Zhu , Fan Zi Fei , He Ling , Xue Xia , Bo Bing
Published: March 2013

Production of superheated steam huff and puff wells is affected by reservoir geological characteristics (effective thickness, net gross ratio), the state of development (recovery degree, integrated water-cut) and steam injection parameters (intensity of steam injection, steam injection rate, temperature and degree of superheat. etc.). On the basis of analysis of each factor, All factors set were established by a new specified model and the weight of each factor was determined by the functional correlation between the factors and production of each well. The integrated measured value of all factors was calculated by dimensionless value of each factor through integrated evaluation methods. Statistics results showed that the oil production of each well has perfect proportional relationship with the integrated measured value of all factors, there is the higher the integrated measured value of all factors, the higher the oil production of each well. According to this good correspondence, the integrated evaluation template was formed, and the total coincidence reached 96% with high reliability in the practical application in the Kenkiyak Oilfield, Kazakhstan.
Fault Sealing Property Analyzing by Water Injection in Oilfields
Authors: Shen Peng Fei , Li Ling , Chen Yong Sheng , Fang Nian Qiao , Li Jian , Wang Feng
Published: March 2013

The quantity and availability of water injection are affected by geological environments in complex small fault-block oilfields, especially nearby faults. It is a general method to qualitatively determine fault sealing ability by water injection availability. The availability analysis of several injection wells can judge sealing ability of five faults of block M28-1 in JD oilfield. The water injection data show that fault F1, F4, F5 are main areas of pressure releasing for unsealing. Fault F2 and F3 are distributed on each side of the water injection well, which have a little influence on loss of water injection for sealing.
The Study on Oil Recovery of Matrix System in Fractured Bottom-Water Oil Reservoirs
Authors: Feng Guo Qing , Zhao Yang
Published: March 2013

Fracture and matrix porosity are two porosity systems in fractured bottom-water reservoir. Knowing the oil recovery in matrix system provides guidance for the later development of the reservoir. Using material balance theory, and combining with Leverett function, oil recovery of matrix and fracture system are calculated respectively, and the ultimate oil recovery of matrix system is predicted.
Fracturing Process Technique of Low-Permeability Gas Deposit in Zhongyuan Oilfield
Authors: Kan Liang , Sun Jiu Zhou , Zhang Dong
Published: March 2013

Zhongyuan Oilfield is featured by low gas reservoir pressure, long perforation distance and bad well condition of some wells. Rimming at setting these problems and realizing effective development of the reservoir, research work on enhancing recovery techniques suitable for the reservoir condition was carried out. The optimized fracturing design parameters and operation methods, along with the propping agent slug and the optimal perforation techniques, greatly improved the accuracy rate of fracturing parameters design, the successful operation ratio, and the fracturing effects. By optimizing the low damage fracturing fluid adaptable for different kinds of gas reservoir and adopting techniques such as comprehensive protection, segregated gel breaking and hard closing of fractures in operation, the reservoir damage by the fluid was extremely decreased.
Study on Factors Influencing Stability of Surface Extraction Borehole above the Goaf
Authors: Li Ri Fu , Wen Guang Cai
Published: March 2013

The paper is based on surface gas extraction technology from boreholes in the goaf in Zhangbei Coal Mine ,Huainan Mining Group .With the method of numerical simulation ,the authors have made analysis on the space-time cracking and moving law about the overburden of mining field during exploiting by contrasting extraction data about boreholes in Huainan Mining Group .Besides ,paper provides conclusion and advices on promoting the stability of borehole in the end .To some extent ,the paper is of instructive significance for the research ,promotion and application of gas extraction technology from the goaf .