bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Bionic Ideas in the Design of Power Machinery
Authors: Wang Bo
Published: October 2013

Solutions of the problems existing in design of power machinery were analyzed. Furthermore, through the introduction of bionic ideas into the design, new thoughts and methods for the innovative design of future power machinery were proposed. After summarizing the application of the bionics in macro and micro aspects, the concept of living power machinery was established finally. Bionic ideas experienced from unconsciousness to consciousness, which will finally push the design of power machinery to a new stage and will help build more power machinery, safe, sustainable, energy-efficient and harmonious.
Structure Design of Closed-Loop Rotary Steerable Drilling Tools
Authors: Wang Ren Sheng , Du Yun Pu , Zhu Ke Gang , Liu Bao Quan
Published: October 2013

Rotating automatic steerable drilling technology is a new automated drilling technology developed in the early 1990s, which is an important aspect of the development of drilling technology in today's world. The basic structure of closed-loop rotary drilling tools is designed and basic structure of hydraulic thrust control system which greatly saves the time for hydraulic oil flowing back into the tank is innovatively designed based on Auto Trak RCLS (Baker Hughes). The structure of closed-loop rotary steering drilling tools, hydraulic thrust control system principle diagram, basic structure of hydraulic thrust control system and basic structure of flow pressure differential control valve and basic structure of oil filter assembly are rendered by AutoCAD drawing software.
Consolidated GC-MS/MS Analysis of PAHs in Gasoline Combustion Dust
Authors: Liu Shu Jun , Xu Hao Nan , Feng Kun , Wang Ying
Published: October 2013

Dust samples of gasoline and disruptors combustion were analyzed by GC-MS/MS. The use of GC-MS/MS determination in the SRM mode, provided the unequivocal identification of the target analytes. The results show that in the gasoline combustion dust samples containing mainly fluorene, phenanthrene, anthracene, fluoranthene, pyrene and other PAHs. GC-MS/MS is an invaluable analytical technique in suspected arson cases.
Study on Room Air Conditioner Dehumidification Capacity
Authors: Wang Qian , Meng Qing Lin
Published: October 2013

Room air conditioner is widely used in a single room or other enclosed spaces to increase the comfort of the environment. It adjusts the temperature and humidity to maintain the comfort for humans; dehumidification is a very important function of room air conditioner. This paper demonstrated the relationship among dehumidification capacity, entering air parameters, and evaporative temperature, presented the calculation method of maximum condensate water flow rate in certain condition, discussed the interaction of energy efficiency ratio and dehumidification capacity, and gave the relationship of condensate water flow rate and evaporative temperature using a specific compressor model. It is suggested that a balance should be made between dehumidification capacity and energy efficiency ratio for room air conditioner operating requirement.
Envelope Spectrum Analysis of Pressure Fluctuation Based on Wavelet Decomposition
Authors: Zhou Yun Long , Wang Fang
Published: October 2013

This paper is based on the wavelet transform theory and the Hilbert transform, it aims at researching on the pressure fluctuation characteristics in the bed, through analyzing and comparing the calculated envelope spectrum of pressure signal after transforms. On the basis of self-built cold fluidized bed, we choose to change the air flow and diameter of particle in fluidized bed as the two influencing factors. For researching the pressure fluctuation characteristics of fluidized bed, we collect pressure signal of the large particle fluidized bed which under normal operation conditions. The experimental results reveal that: as the increasing of the air flow, the energy of pressure increases; and with the increase of particle size in fluidized bed, the pressure fluctuation decreases in the bed.
Simulation Study on Different Composition Fuels in Lean-Burn CNG Engine
Authors: Song Chang Qing , Li Jun , Qu Da Wei , Liu Qi Jie
Published: October 2013

The Paper has Established a Combustion Model of Lean-Burn CNG Engine by Three-Dimensional Simulation Software AVL FRIE. Based on Test Validation in the Model, the Combustion Processes of Seven CNG Samples were Simulated and Compared from the Intake Valve Closed to the Exhaust Valve Opening. the Effects on Different Composition Fuels for CNG Engine were Researched. the Results Showed that: the Maximum Average Pressure within the Cylinder , the Highest Average Temperature, the Maximum Heat Release Rate, the Initial Mass Fraction of Fuels, CO and NO Formation Increased with the Hydrocarbon Fuel Ratio C/H, the Composition of Heavy Paraffin in CNG Directly Affected the Performance and Service Life of the Engine.
Simulation Research on the Spray and Formation of Mixture of Gasoline Direct Injection Engine
Authors: Chen Bo Yu , Du Ai Min , Xu Zhi Jun
Published: October 2013

A computational model of a GDI engine is established by 3D CFD simulation software. A simulation on the formation of mixture of the engine under 1500r/min, full load conditions are carried out. The calculation results provide a reference for the optimizing of the engine.
The Honeycomb Core Design of Modular Based Wine Packaging
Authors: Wu Jian , Du Yan Ping , Zhang Yang
Published: October 2013

Use the standard 750ml bottle of red wine packaging design to explore the honeycomb core module of digital design and green manufacturing approach to virtual design and virtual manufacturing of new structural approach to packaging product development, through the final product form of reverse thrust reversers honeycomb core module data and processing forms, and finally the use of CNC machining centers cellular module manufacture.
Study on Acoustic Catheter of Boiler Tube Leakage Monitoring Systems
Authors: Lv Yong Xing , Yan Chen Shuai
Published: October 2013

Boiler tube leakage is the major reason of affecting the safe operation of the unit now, there are 3 methods of the "four tube" leakage detection: Traditional method, filtering method and acoustic spectrum analysis, acoustic spectrum analysis is the common method, but this method have low sensitivity and the sensor damage easily. Therewith, designed the special acoustic catheter with acoustic resonance cavity type, proved by experiments, the acoustic catheter with acoustic resonance cavity type can enhance leakage sound, can accurately extract leakage signals, has high sensitivity, and can avoid the effect of sensor by fire and hot-gas when the furnace is in positive pressure situation, reduce the installation and maintenance costs of the boiler tube leakage monitor system.
Design and Research on a Automatic Cleaning Device of Wind Turbine Blades
Authors: Lv Tai , Wang Qiang
Published: October 2013

Aiming at ash deposit problem of wind turbine blades, a cleaning device for 10kW horizontal axis wind turbines was designed by applying the mechanism that ash deposit on blades surface was purged by high-speed flows from nozzle. Using fluent software, a numerical simulation was carried out in cleaning device, and its pressure field and velocity field in different cross section of wind turbine blades were simulated under cleaning state. The results showed that positive pressure zone created by cleaning device was formed on blades surface, and high-speed airflow purging blades surface was formed. As a result, the purpose of cleaning is achieved.
Analysis on Variation Characteristics of Air Pollution Index in Cangzhou
Authors: Wang Jian , Xu Mei , Ye Xia , Liu Wei
Published: October 2013

On the basis of the daily air pollution index (API), primary pollutant, air quality level and status in Cangzhou from January 2009 to December 2012, the variation characteristics of air quality were analyzed. The results showed that API presented obvious seasonal variations with the highest value in winter and the lowest value in summer. PM10was the principal pollutant and accounted for 63% of the whole period. The percentage of excellent and good air quality was 93% during the period. The relationship between API and meteorological factors indicated that API was negatively correlated with temperature and relative humidity, but was not obvious correlation with air pressure and wind speed. The cluster analysis of backward trajectories showed that different types of air masses contribution to the API level showed some differences in different seasons. The north air mass in fall and northwest air mass in summer had the lowest contribution to the API level; while the local source could lead to the highest API level in winter suggesting that the heating and adverse weather conditions in winter may be the main cause of high API.
The Hydraulic Optimization Design of High Specific Speed Axial Flow Pump for Sewage Treatment
Authors: Gao Jie , Hu Shou Gen , Zhao Jun
Published: October 2013

With the development of the city sewage treatment, the request of the specific speed of axial flow pump has been higher and higher. At present China is lack of the system theory and method to design axial flow pump above 1400 specific speed. Selection methods of design parameters depend on experience. This paper used the improved lifting method to design axial flow pump. Optimize design of axial flow pump from cascade solidity, blade number, ratio hub and the airfoil of impeller. The feasibility of such optimize methods had been validated from theoretical analysis. Put forward new selection methods of design parameters. Design an impeller model. The rated condition of flow rate is 3000 m3/h and the rated condition of lift is 1 m. A useful reference of axial flow pump design, improvement and optimization was obtained.
Effect of Load Frequency on Dynamic Similitude of Scaled Model
Authors: Song Yu Chao , Cai Yan Nian , Huang Chao Ming , Yu Hong Liang
Published: October 2013

The similitude requirement of excited load was deduced to maintain the consistent vibration between scaled model and prototype structure, based on the modal theory of multi-DOFs systems. The similitude of load frequency was another demand to maintain the consistent vibration, with the similitude of structure size and load magnitude. The dynamic similitude problem of a liquid tank was studied by finite element method and test analysis respectively. The results show that the similitude of load frequency is the insurance for the consistency of prototype and scaled model structures vibration. In a case the magnitude error of displacement is 8% to 10%, and the displacement and acceleration have all changed distinctly without the similitude of load frequency. All the results indicate that the similitude of load frequency is the key factor to analyze the scaled model dynamics correctly.
Modeling of a Multiple Effect Desalination System
Authors: Liu Guang Yu , Ren Hai Xia , Xue An Ke , Shen Guo Qiang
Published: October 2013

A multiple variable model is developed for a multiple-effect low temperature desalination system. Multiple-effect water desalination has been used in industry for decades due to its high efficiency and high quality of fresh water production. Here, its dynamical process is modeled based on the mass and heat conservation laws and then expressed in terms of a state space equation, enabling people to carry out analysis and design controllers.
Parameters Optimization of Rotary Drying by Uniform Design
Authors: Ma Jing , Lei Xiao Long , Ma Rong Chao
Published: October 2013

In order to optimize the structure and technology parameters of rotary drying, mathematical models of effective residence time and mass of loading were established based on the motion of solid particles in rotary dryer. Uniform design was applied in experimental design with material of rapeseed. Four independent variables such as structural parameter (cylinder inclination angle) and operating parameters (the rotation speed of rotary dryer, solids feed speed and airflow speed) were investigated. Prediction models of effective residence time and mass of loading were established by using software DPS7.05 to optimize the experimental design. The experiment results showed that under experimental conditions, the effects of airflow speed, rotation speed, the interaction of rotation speed with airflow speed and the interaction of rotation speed with solids feed speed on effective residence time were significant. Rotation speed, airflow speed, the interaction of cylinder inclination angle with solids feed speed and the interaction of feed speed with airflow speed had significant influences on mass of loading. By optimizing with multiple objective programming, the optimal parameters were obtained as follow: cylinder inclination angle of 1.8°, rotation speed of rotary dryer of 4 r/min, solids feed speed of 2.5 kg/s and airflow speed of 2.4 m/s. The research has important significance to well improve structure and technology parameters of rotary drying technology in solids drying.
Fluid Dynamics Analysis of Hot Film Sensor in a Sampling Micro Flow Channel
Authors: Zhao Li Feng , Ji Xiang Bin , Sun Yao
Published: October 2013

Thermal film air flow sensor has the characteristics of high precision and fast response. The intake-air velocity in the engine inlet manifold is over the measurement range of the sensor, it is necessary to design special sampling flow channel which can reduce the flow velocity and achieve a stable flow state. The micro flow channel flow field was simulated with CFD meathod, the results show that a well-designed sampling port can obtain stable flow field and effectively low the speed, which can improve the velocity uniformity for measurement in the sensor location. The sampling channel conduces to obtain higher measurement accuracy.
Gas Chromatography Mass Spectrometry Method of Rapid Determination of Trichloroacetaldehyde in Water Optimization
Authors: Sun Mo Jie , Zhang Ling , Jia Ruo Kun
Published: October 2013

Chloral alkali at room temperature Can be quickly converted into chloroform completely, Application of this principle, By Purge and Trap GC/MS method , Determination of the alkali content of chloroform in water before and after the difference, Inverse to get the water content of chloral. NaOH were added to different volumetric flask. It is flask with standard solutions in different concentrations. Aside a certain amount of determination, error is larger. NaOH was injected directly into the injector. This was the method. It completely transformed in Purge and Trap, greatly reduces human error. The linear range is 0.5-20ug/L, the minimum detection limit can reach 0.05ug/L, the relative standard deviation is less than 2.3%, the average recovery was 97.5%. This method is simple and quick,the results are accurate and reliable, which is able to meet the drinking water source in the analytical needs of chloral.
Application of BP Neural Network Based on Immune Particle Swarm Optimization for Fault Diagnosis of Power Transformer
Authors: Zhang Yu Xin , Liu Yu
Published: October 2013

Cloing and hypermutation of immune theory were used in optimization on particle swarm optimization (PSO), an immune particle swarm optimization (IPSO) algorithm was proposed , which overcome the problem of premature convergence on PSO. IPSO was used in BP Neural Network training to overcome slow convergence speed and easily getting into local dinky value of gradient descent algorithm. BP Neural Network trained by IPSO was used to fault diagnosis of power transformer, it has high accuracy after experimental verification and to meet the power transformer diagnosis engineering requirements.
Multifunction Intelligent Dynamic Weighing System Based on Embeded Computer
Authors: Zhu Jie Bin , Liao Gao Hua , Liu De Hui
Published: October 2013

A weighing instrument system embedded multifunctional intelligent has been developped, and a compensation method proposed to improve the measurement accuracy of the system performance. Weighing instrument took embedded computer as the core, used the logic processing of the powerful FPGA, USB interface data communication function connecting to the PC machine to build host/slave system. Dynamically compensate in the series compensation link to solve the system of nonlinear strength, poor dynamic performance of sensor, short the time to reach the steady state for the whole measurement system. Results show that the system is suitable for the requirement of fast measurement, effectively improve the accuracy and reliability.
Reserch on Removal Technology of Snowflakes in Video Images
Authors: Ning Hui Ying
Published: October 2013

Using improved K-means clustering method to remove snowflakes in video images getted in snowy day is put forward. According to the brightness changes of the image, we clustering estimate brightness changes of all the pixels in the image by using background brightness values instead of the brightness values of the snowflakes to achieve the goal of removing snowflakes. The results of experiment show that the processing effect of the method is very obvious for light snow and heavy snow, and even storm snow.It can get good results.
Pixel Level Image Fusion Algorithm Based on PCA
Authors: Li Ming Jing , Dong Yu Bing , Li Jie
Published: October 2013

Image fusion algorithm based on principal component analysis (PCA) was proposed in this paper. The algorithm make use of the characteristics that the principal component decomposition can retain the main information of the original data, it get covariance matrix, eigenvalue and eigenvector of covariance matrix from the source image. Then we can get the weighted coefficient and fused image with the help of eigenvalue and eigenvector. Simulation result shows that the better image quality is obtained in the proposed algorithm.
Research on Feature Extraction Based on Color and Texture
Authors: Dong Yu Bing , Li Ming Jing , Cheng Guang Liang
Published: October 2013

Feature extraction was a critical stage of image retrieval. For the characterization of the contents of an image could be directly affected by feature extraction. The single feature of images could not fully express images content information, make that the precision of Content-Based Image Retrieval (CBIR) be limited. To overcome the short points, texture information was used in the CBIR. The image color feature and texture feature were comprehensive extracted. And an image retrieval system was developed under MATLAB platform. The new method was simulated and verified by MATLAB.
The Remote Metrology of Water Pollution Source Online Monitor Based on 3G Technology
Authors: Sha Yue Bing , He Hong , Shao Jian Wen
Published: October 2013

In order to improve the efficiency of metrological ordinary work in water pollution source online monitor instrument and reduce the measurement personnel's labor intensity. 3G technology has been used to connect test instrument with the client's network through the study of the STM32 type microprocessor and analog-to-digital conversion to test instruments output current. DTU and 3G wireless network have been used to complete the testing data of the transmission, as well as formulate the corresponding server and client software,which perfect man-machine interface and facilitate man-machine interaction. Field experiments show that the system is stable and reliable, which can effectively meet the demand of the measurement and have a broad application prospect.
Redefined Distribution of the Permian Volcanic Rocks in the Tarim Basin: Based on Logging and Seismic Data
Authors: Pan Yun , Wang Zong Xiu , Pan Mao
Published: October 2013

There are a lot of Permian volcanic rocks which are widely distributed in Tarim Basin. Because of the shielding effect of the volcanic rocks to the underlying structure, the distribution of the volcanic rocks in Tarim Basin is very important to the deep oil and gas exploration. However, with the progress of oil exploration in Tarim oil field in recent years, much more logging and seismic data is available. Based on the model of logging-seismic integrated identification, the distribution of the Permian volcanic rocks is revised by using the drilling, logging and seismic data. It shows that the rhyolite is mainly distributed in the north basin, and the basalt is widely distributed in the basin. Moreover, the basalt has larger area than which delineated by other people.
Spectroscopic Methods Used for Structural Analysis of Natural Crystals
Authors: Zhao Jian Hua , Ma Jia Jun
Published: October 2013

Most of the natural crystal color distribution are more uniform, different shades, pastel colors, while in manual control is relatively stable under the conditions of the synthesis of crystal growth, its internal characteristics exhibited excessive uniformity, color uniform, uniform, gaudy, dull, colorant concentration is too high or too low, make crystal color appears too deep or too shallow phenomenon. This paper studies the characteristics of natural crystal detection methods.
Discussion on Metallogenic Epoch and Ore-Forming Types of Ore Deposits in Qinling-Qilian-Kunlun Metallogenic Domain
Authors: Lu Lin , Jiang Fu Jue
Published: October 2013

On the basis of discovered deposits in Qinling-Qilian-Kunlun metallogenic domain, the paper describes statistical characteristics of deposit size and ore-forming type to find the rule of the geological processes through describing mineralization time, types, scale and ore-bearing construction and draws a conclusion of regional mineralization.
Simulation and Parameters Analysis of Fault Geological Structure for Detection in the Excavation Face
Authors: Zhang Wei Jie , Hao Ming Rui , Liu Zhi Min , Liu Xi Gao , Wu Miao
Published: October 2013

In order to study on the advanced detection technology and the sensitivity of the Fault geological structure based on induce polarization (IP) method, and analyze the hazards of the Fault geological structure in front of the excavation face of coal mine roadway. This paper establishes a simplified physical model of the structure and converts the model into an equivalent circuit for convenient study and then constructs an IP model of the Fault geological structure. The IP model is connected with the simulation detection model of geological abnormal mass to obtain the changed curves of the apparent resistivity and the apparent frequency under the IP mode. The curves obtained show that simulation detection results agree with the electrical parameters specified by the IP model. Therefore the basic idea of the electric method detection is verified, which will provide a feasible presupposition for the development of the coal (rock) IP effect based on the advanced detection instruments with the electric method.
Research on Modeling and Visualization Method of Geological Objects Based on VRML
Authors: Yang Chang , Li Hao , Gao Peng , Mao Yu Feng , Zhang Rong Chun
Published: October 2013

Geological strata conditions is restriction to the design and construction of projects .The significance of three-dimensional modeling of engineering rock mass is obviously for both construction and monitoring.However,the existing three-dimensional modeling methods have the disadvantages of low productivity and huge amounts of data . Focusing on these problems, a fast modelling method used to build geological model is presented in this paper. Compared with the special geological 3D modeling and analysis software ,VRML has many merits such as flexible visualization method, good transplantation of the visualization achievements , and independent platform . VRML also has the feasibility of low-bandwidth and the real-time visualization and browsing of the models .It is well suited to the visualization requirement of drilling data and cross-sectional data ,and provides a new solution for the realization of the geological visualization.
Experimental Research on Transient Electromagnetic Multi-Turn Minor Loop Device
Authors: Zhang Kai , Gao Jun , Hao Xiao Xia
Published: October 2013

There is the polar distance selection of dipole device, the location determination of recording points, the resolution capability of multiple anomalies and other problems existing in the practical application of transient electromagnetic method in multi-turn minor loop device. Through physical simulation experiments, this paper gives experimental comparisons of polar distance, recording points, and the resolution capability of two anomalies in a certain interval between dipole device and overlapping device. The experimental results show that: the dipole device has the better resolution capability of small polar distance, 1.25 times wire-frame side length is appropriate for general selection of polar distance, and the maximum distance should not exceed 1.5 times wire-frame side length, the recording point is located in the midpoint position of transmitting and receiving coils; while the overlapping device has the obviously higher resolution of double anomalies in a certain interval than dipole device, and the minimum resolution is about 1.5 times wire-frame side length. These characteristics provide the realistic basis for reasonable selections and optimization designs of multi-turn minor loop observation system.
Geophysical - Geochemical Anomaly Characteristics and Prospecting Marks of Dachang Gold Deposit in Qinghai
Authors: Wang Shou Liang , Qu Cui Xia , Liu Wei
Published: October 2013

Dachang ore field is located in the central of Au, Sb, Hg metallogenic belt in the north Bayankela mountain, with the Maduo - Gande deep major fault as its regional guide mineral structure. The gold deposits have grew up in the fracture - fissure system of large share zone in BaYanKaLa mountain group of Triassic strata, and Magmatic activities in Yanshan Period provides favorable conditions for the activation, migration, enrichment and mineralization of gold element. Geophysical - geochemical anomaly and remote sensing of this area have shown that they are related with the mineralization, that means abnormal area with bigger Intensity is often located in the cross area of tectonic alteration and mineralization. Triassic strata, the north - west fault and its secondary structure - rock system and geophysical - geochemical anomaly are the obvious symbols of gold prospecting in the area. Through the metallogenic regularity, obvious symbols and distincting some geophysical - geochemical anomalies, more large and medium-sized gold deposits have been found. We should along the Maduo - Gande fault zone, extending for east - west trend and the depth, and larger scale gold deposits is expected to be found.
Study on Rock Bolt Support of Roadway of Coal Mine Using Neural Network
Authors: Han Feng Shan , Wu Xin Li
Published: October 2013

The artificial neural network has been widely used in various field of science and engineering. The artificial neural network has marvelous ability to gain knowledge. In this paper, according to principle of artificial neural network , Model of artificial neural network of rock bolt support of roadway of coal mine has been constructed,Learning system of BP artificial neural network has been trained,it is shown by engineering application that artificial neural network can handle imperfect or incomplete data and it can capture nonlinear and complex relationships among variables of a system. the artificial neural network is emerging as a powerful tool for modeling with the complex system. Method and parameters of rock bolt support of roadway of coal mine can be predicated accurately using artificial neural network, that is of significance and valuable to those subjects of investigation and design of mining engineering
Effect of Feed Angle on Centrifugal Flotation Cell
Authors: Chen Wen Yi , Wei Yue You , Sun Bing , Tang Kai
Published: October 2013

Feed angle have a great effect on the flotation efficiency of self-priming centrifugal flotation cell.In order to improve the efficiency of flotation,the effect of feed angle on the flow field in a self-priming centrifugal flotation cell was investigated using STAR CCM+.The distribution law of velocity,pressure,turbulent kinetic energy under different angles was gotten.The turbulent kinetic energy and the pressure difference increased with the feed angle. Result shows that the feed angle acting on the interior flow field is significant and the feed angle of 20º is more conducive to flotation than others.Conclusion can provide a theoretical foundation for improving flotation efficiency and optimizing flotation structure.
Analysis on Complexity of Integrated Development of Artery Mining Industry and Vein Mining Industry
Authors: Wu De Hua
Published: October 2013

For traditional mineral development issues such as excessive consumption of resources, deterioration of the ecological environment, proposed develops the vein mining industry on the basis of the artery mining industry, forms the positive cycle system, realizes the integrated development of vein mining industry and artery mining industry. The integrated development of artery mining industry and vein mining industry is an open complex system, the traditional scientific methods cannot solve complex system problems, and complexity science method must be used to resolve it. Through complexity analysis of dissipative structure, coordination effect , overall emergence and complex adaptive system (CAS) of artery mining industry and vein mining industry integrated development, proposed the methodology of research artery mining industry and vein mining industry integrated development is the meta-synthesis, has provided a path of sustainable development for the region mining industry.
A Numerical Study of Flow Field in a Hydrocyclone for Potash Ore Desliming
Authors: Li Da , Cheng Fang Qin , Li Jian Feng , Guan Yun Shan
Published: October 2013

Despite the widespread use of hydrocyclone in the process of potash ore desliming, its accurate design is often difficult because the feed composition is complicated and the viscosity is high in the brine system. In this study, a numerical approach based on computational fluid dynamics (CFD) was performed to describe the flow field. The numerical simulation of flow pattern in hydrocyclones for potash ore desliming was presented. Some basic information concerning the velocity and pressure distribution is given, and the results can be used as the fundamental basis for its design.
Numerical Modeling of Subsidence-Induced Stress on the Pipeline in Steep Seam Mining
Authors: Cheng Guo Ming , Liu Tong Zu , Zhi Bin
Published: October 2013

In China, surface subsidence caused by steep coal seam mining has affected the safe operation of pipelines in recent years. The study site is one coal mine, where the gas pipeline from Shanshan to Urumqi is across. FLAC3D was adopted to study subsidence-induced stress on the pipeline, and the numerical model was calibrated with the measurement data. Visualization of alarm levels on the pipeline was obtained by integrating the usage of Fish function embedded in FLAC3D and Tecplot. The simulations reveal that the stress on the pipeline is closely related to the excavation depth. The stress on the pipeline increases with the excavation depth increasing when mining the 1st, 2nd, and 3rd levels, whereas the stress on the pipeline decreases slightly with the excavation depth increasing when mining the fourth, fifth, and sixth levels. The maximum stress on the pipeline occurs after mining the 3rd level. The possible damage to the pipe is at the upper-right side. Therefore, the results are helpful to prevent and reduce the impact of subsidence on the pipeline.
An Experimental Study on Destructive Nature of Seam Roof Strata with Horizontal Bedding
Authors: Fang You Ling
Published: October 2013

Subjected to external forces, the structure surface between rocks (ie, bedding planes) should be deformed under external force. If the two side walls of the rock bedding plane has perfectly flat smooth surface, after the composite layered rock subjected to force, bedding plane can be closed as surface contact manner. However, the rock bedding plane side walls generally showed local contact state in the nature, the rock layers of bedding planes will produce compressive deformation under stress. Through complete stress - strain triaxial loading experimental study on the effects of the presence of horizontal bedding on layered composite rock strength and deformation, and the elastic deformation of layered rocks are calculated using elastic mechanics, the result shows that due to the presence of irregular bedding plane, the presence of horizontal bedding formation will reduce the overall strength, and increase the overall rock deformation.
Study on the Coefficient of Surface Subsidence by Mining on the Condition of Thick Unconsolidated Layers and Thin Stratum
Authors: Wang Hong Tao , Zhao Bing Chao , Wang Jin Dong
Published: October 2013

Aim at the phenomenon of sidestep subsidence on surface by mining on the condition of thick unconsolidated layers and thin stratum,article bases on the theory analysis and calculation, and uses determining key strata and key strata flexibility calculation, and expatiates the characters of η, and makes it divide into subsection function. Contrast with project example and simulation test, it shows:if subsection function η is applied, then using it to forecast the quantity of surface subsidence that will be more approach to fact, which can syllabify explain phenomenon of sidestep subsidence on surface, and has definite meaning to coach locale.
Study on the Response of Surrounding Rock for Gob-Side Entry Retaining under the Mining
Authors: Zhao Mao Sen , Wei Ke Min , Wen Ze Kang , Fang You Ling
Published: October 2013

A coal mine in Chongqing +590m south four district 2443 working face as the research object, using the finite difference method (FLAC) which can solve the nonlinear large deformation problem, setting up the mechanical analysis model of the gob-side entry retaining, analyzing the structure characteristics of surrounding rock, and studying on the stability of surrounding rock of the gob-side entry retaining under the mining. the results showed that:(1) After the coal mining, the maximum displacement of roof has occurred on the edge of the roadway upper side near the filling body. The floor heave at the beginning mining, the floor has a downward displacement after the mining;(2)After the coal mining, the surrounding rock of the gob-side entry retaining has a larger range of shear failure, a strong tensile damage was occurred in filling body, big horizontal displacement was happened in the middle of filling body. Research results can provide reference for similar coal mining..
Distribution of Underground Pressure Law and Fracture Zone Prediction Research of Overburden in Steep and Multiple Coal Seams Mining
Authors: Wei Ke Min , Zhao Mao Sen , Wen Ze Kang , Fang You Ling
Published: October 2013

Use Taiping coal mines second horizontal (+1100m~+900 m level ) 1#, 3# and 5# coal seam in Panzhihua Baoding as the research object, apply the problem solving nonlinear large deformation finite difference method (FLAC), to research the steep multi-seam mining of pressure distribution and characteristics of fracture zone. The results show that: (1)During the course of three coal mining extraction, the stress of goaf surrounding rocks will be changed. (2)When the nearby coal is mining, the coal pillar come into being stress concentration near the area. when the mining work continues, the goaf will have an effect on the protection pillar, which is similar to the "liberate". the effect of coal pillar and stress concentration nearby will be eased; (3)After the coal mining, plastic failure has occurred over the protection pillar, forming a water guide channel. Research results can be as a reference for similar steep seam mining.
Study on Numerical Simulation of Permeability Variation with Caving Mining Method
Authors: Mei Yong
Published: October 2013

Surrounding rock constantly changes in the process of the stress concentration and release alternately with the method of caving mining, coal and surrounding rock break and form some channels for gas migration, causing the gas permeability o f surrounding rock changes. As the research object of coal mine in Shanxi with caving mining method, using the exponent relation of permeability and stress change, establishing the concept of relative permeability, based on FLAC3D software, revealing the law of rock permeability variation in the mining process. The study shows: (1) the relative permeability can directly characterize the level of rock (coal) affected by mining; (2) in the vertical direction, the roof and floor have a wide range of relief, permeability increases and then decreases exponentially, affecting the range 30 ~ 40m; (3) overburden above the mined-out area damaged as an "O"-ring; (4) immediate roof obvious with a relief range of about 45 ~ 60m. Therefore the study has good guidance on gas drainage.
Study of Optimization Method for Variable-Density Completion of Horizontal Well
Authors: Jia Liu , Lu Li , Du Bao Jian
Published: October 2013

Based on Landman variable density perforation model, a horizontal well variable-density completion coupling model is derived under non-homogeneous formation conditions. And an actual well is taken for example to calculate the production fluid profile of horizontal well under different perforation densities. The results show that the production fluid profile of the high and low permeability section tends to be even with the decrease of the perforation density of the high-permeability section. Based on the coupling model, optimization methods for the variable-density completion of horizontal well under uneven stratum conditions are put forward. The production fluid profiles of optimized perforation model, actual perforation model, and even perforation model are compared. According to the results, the horizontal well corresponding to the optimized perforation model is with the most balanced inflow profile.
The Dual-Porosity Vertical-Well Model for Transient Pressure Analysis of Naturally Fractured Shale Gas Reservoirs
Authors: Jiang Yi , Xu Rui , Chen Meng
Published: October 2013

During the process of development for shale gas reservoirs, the permeability of fractures will decrease due to stress-sensitive effect. Adsorption is also an important mechanism which determines the production of shale gas reservoirs. Therefore, the effect of stress sensitivity and adsorption must be considered in the numerical model for pressure transient analysis. In this paper, a dual-porosity model was established considering both mechanisms, and finite-difference method was used for discretizing fluid equations. Then Newton method was applied for solving the resulting algebraic equations, and the typical curves in terms of dimensionless pseudopressure and time were drawn with different sets of parameters. The numerical well-testing model provides theoretical basis for interpreting production data of shale gas reservoirs.
Numerical Simulation of Response of Explosion Ground Shock to Buried Gas Pipeline
Authors: Jing Xiao Fei , Cai Zhi Yong , Liu Ke Hui
Published: October 2013

In this paper, by using nonlinear dynamical theory and Arbitrary Lagrange Eulerian (ALE) algorithm in LS-DYNA 3D finite element program, a method of numerical simulation is used to study dynamical response of buried gas pipeline underground shock wave of underground explosion. The simulation results shows that it is feasible for the numerical simulation method in this paper to study dynamical response of buried pipelines underground shock waves from explosion. the conclusion in this paper may provide significant reference for the risk evaluation and disaster prevention of buried gas pipeline.
Effect of Salinity and Temperature on Swelling Behavior of Nano/Micro Polymer Particle
Authors: Lou Yu , Zhu Wei Yao , Zhang Xue Ling , Long Yun Qian
Published: October 2013

Nano/micro polymer particles of acrylamide (AM), acrylic acid (AA), methyl methacrylate (MMA) are used to enhance oil recovery. Swelling kinetics of nano/micro polymer particles were investigated through experimental analysis and statistical analysis. The effect of salinity and temperature on swelling behavior over time is studied experimentally. The swelling kinetics of nano/micro polymer particle was described by second order kinetics. Equilibrium swelling ratio and swelling rate were obtained through nonlinear regression. The quantitative relationships between equilibrium swelling ratio and salinity, temperature were presented. Results show that the swelling ratio increases with increasing temperature or decreasing salt concentration. The study provides a direct perspective of swelling characteristics of nano/micro polymer particles for oil recovery enhancement.
A Study on Factors Influencing the Effect of CO2 Flooding in F48 Block
Authors: Tong Zhi Min , Song Kao Ping , Xu Zi Yi
Published: October 2013

Using the Eclipse software to establish the component numerical simulator of formation crude, this paper analyzed the factors that influence the effect of CO2 flooding, including permeability, the crude oil relative density, the inlayer heterogeneity, interlamination heterogeneity, intrastratal cross flow channel and so on. The results show that along with the increasing of the permeability, the degree of reserve recovery of CO2 flooding enlarged, and with the increasing relative density of the crude oil, the degree of reserve recovery of CO2 flooding decreased. The stronger of the inlayer heterogeneity and the interlamination heterogeneity, and the higher of the permeability of the cross flow channel is, the lower level of CO2 flooding degree of reserve recovery it tends to be.
Impact of Waste Coal on Chemical Composition of Soil Solutions in Industrial Areas of Abandoned Coal Mines (Evidence from Avangard Mine, South of the Russian Far East)
Authors: Arefieva Olga D. , Nazarkina Alina V. , Gruschakova Natalia V. , Sidorova Daria V.
Published: October 2013

Waste coal impact degree on chemical composition of soil solutions were studied by key hydrochemical parameters in the industrial area of abandoned Avangard coal mine. It was found that the impact of waste coal and mine waters is seen in accumulation of sulfides and silicon compounds in humus soil horizons; iron, chrome and copper in mineral horizons. Close correlation between chemical composition of mine waters and composition of soil solution was found.
Assessment of NPV Uncertainty on Heterogeneous Reservoirs during Polymer Flood
Authors: Yu Kyung Wan , Choi Byung In , Lee Kun Sang
Published: October 2013

This study shows net present value (NPV) distribution by considering uncertainties in porosity, oil viscosity, water saturation, and permeability for polymer flood with Monte Carlo simulation. For high and low average permeability conditions, differences of NPV between polymer flooding and water flooding have been investigated. According to results both average NPV and range of NPV distribution tend to increase with porosity and permeability in all cases. Although water saturation and oil viscosity affect NPV, they are not important parameters that conclude uncertainty of NPV under the conditions considered in this study. For high permeability model which has Dykstra-Parsons coefficient (DP) as 0.72 and porosity as 0.3088, Monte Carol simulations for polymer flood show that 50th percentile (P50) of NPV is 352.81 M$. If porosity is decreased from 0.3088 to 0.1912, the P50 is also decreased 63.8 %. The reduction of NPV during polymer flooding in low permeability reservoirs are almost 40 % higher than that of water flood. These differences come from polymer adsorption and permeability reduction that easily occurs in low permeability zone. The procedure has proven to be useful tool to generate probability distribution of NPV when polymer flood is selected as a tertiary flood process.
Experimental Study on CO2 Displacement Program
Authors: Tong Zhi Min , Song Kao Ping , Xu Zi Yi
Published: October 2013

3D and three-phase simulating module of extra-low permeability reservoirs in YSL Oilfield has been established by using PVTi module and E300 module of ECLIPSE. Based on historical matching, Parameters such as gas injection volume, slug size, gas/water ratio, the speed of gas injection and injection rate of sequent water flooding in water alternating gas were considered. The volume of increasing oil and oil-draining rate were taken as evaluation criterion. Then orthogonal test design was preceded according to the principle orthogonal experimental design. Through intuitive and variance analysis with the test results, primary and secondary orders evaluation criterion effected by injection parameters were obtained. The best combination scheme of water alternating gas injection parameters was optimized, which provides theoretical direction and technical support to water alternating gas injection parameters optimization in spot CO2displacement[1-3].
Analysis the Correlation of Port Logistics and Regional Sustainable Development Ability to Tianjin - For Example
Authors: Yuan Qing Min , Ning Ning Ning
Published: October 2013

The paper selected certain indicators of regional sustainable development and port logistics, on the basis of systematic analysis of the sustainable development ability, which taked Tianjin as an example by means of the grey correlation analysis method, we study the regional sustainable development ability and the correlation of port logistics in order to provide a certain theoretical basis and reference for the development and the ability of port logistics.
Function Transformation to Adapt to Aging Development in Small Towns in Southern Jiangsu Province
Authors: Chen Zong Yu , Xu Qian , Huang Yao Zhi
Published: October 2013

With the unique geographic position and our own resources advantage, the functions undertaken by small towns in southern Jiangsu Province shall be transformed under the background of aging. By analyzing the key nodes of function transformation in small towns in southern Jiangsu Province and combining the requirements of current urban development situation, we make clear that the urban functions must transform to adapt to aging. Moreover, combing our own resource endowment of adaptive aging development, we make an analysis from the four aspects of location advantage, economic strength, land resource advantage and ecological environment advantage and propose the countermeasures for function transformation to adapt to aging development in small towns in southern Jiangsu Province in order to make them become a gathering place for the aged and the gather of silver age industry, and adapt to the challenges brought by aging development.
A Research on Applying Dynamic Remote Sensing Techniques to Protect Suzhou Urban Wetland Park
Authors: Xiao Xiang Dong , Wang Bo , Dong Li
Published: October 2013

This research applies dynamic remote sensing and conventionally terrestrial fixed plot techniques to monitor wetland in Suzhou on a multiple scale. It investigates the components of Suzhou urban wetland and its ecological features with a comprehensive analysis of the types of urban wetland, its water resources and land use conditions. This research aims to establish a remote sensing monitoring index system and further build connections among monitoring, evaluation, planning and policies. It also wishes to use modern theories and technologies of ecology and ecological engineering to propose a model and a constructive plan for ecologically restoring the urban wetland in Suzhou which will provide relevant theoretical and technological support for ecological restoration and reconstruction.