bluuebunny/crossref_metadata_2025 huggingface dataset:
Research the Influencing Factors of the Low Wind Speed Wind Turbine Fatigue Loads
Authors: Wu Fa Ming , Wang Lei , Wang Dian , Jing Jia Bao
Published: August 2014

This paper analyzes three main factors (turbulence intensity, air density, annual average wind speed ) that influence the low wind speed wind turbine fatigue loads, In order to analyze the influence of each main parameters how to affect the fatigue load of low wind speed wind turbine, using a 2000kW wind turbine as an example on the simulation test , 3 turbulence, 4 air density and 7 annual average wind speed were employed. The results show that, with the air density, turbulence intensity and the annual average wind speed increases, the wind turbine of fatigue load increase in rule approximately. Based on the above rule, it can reduce fatigue loads and prolong the life of wind turbine in design optimization of low wind speed wind turbine and sit choice.
The Reserve Capacity Model Based on the Idea of Scenario in Power System
Authors: Zheng Xiao Li , Liu Ji Chun , Li Jia Yi , Wu Yun Xia , Zhang Fang , Chen Hong Hui , An Xiang Yang , He Chen
Published: August 2014

According to the impact of the wind power prediction uncertainty on the power system reserve capacity, the idea of scenario is introduced to the stochastic programming model. The method of scenario is used to simulate the uncertainty model of the wind power generation, load and the conventional units. The scenario-reduction methodology is combined to reduce the large scenario set to a simpler one, then the probability statistics on these scenarios is given in order to obtain the probability density of the system power difference, and the expected energy not supplied (EENS) and expected wind waste risk (EWWR) are presented. The reserve capacity is determined by the two aspects, which are the reliability shown by EENS and EWWR, and the economy of reserve capacity cost. Finally, simulations on a ten-unit system are given to demonstrate the method is effective to reduce the cost of reserve and the abandoned wind power in the context of system reliability.
Vibration and Damping Analysis of Carbon Fiber Wind Turbine Blade with Viscoelastic Damping Treatment
Authors: Wang Lin , Cheng Tai Hong , Tang Xu Dong , Qian Jin Gui
Published: August 2014

The paper have described the vibration and damping analysis of carbon fiber wind turbine blade with viscoelastic damping treatment using commercial ANSYS program. The wind turbine system including a carbon fiber layer and a viscoelastic damping layer was attached on inside of carbon layer. Firstly, the natural frequencies and mode shape of pure carbon fiber turbine blade were compared with viscoelastic damping treated turbine blade using modal analysis. There were 1mm, 2mm, 3mm thickness damping layer finite element model to be constructed. The results show the little changes in lower first mode but getting smaller with higher modes. Finally, the frequency response functions of damped and undamped turbine blade were calculated for investigating the damping effect of viscoelastic damping layer. As shown in the results, the viscoelastic damping layer has good damping effect for vibration control of carbon fiber wind turbine blade.
Discussion and Application of Passive Hydrogen Recombiner in Qinshan Phase II Nuclear Power Plant
Authors: Chen Hai Qiao , Qiu Yi Mu , Wang Xiao Wei , Yu Ying
Published: August 2014

A large amount of hydrogen would be generated because of zirconium-water reaction during serious accidents in nuclear power plant (NPP). Hydrogen could be combusted or explode under certain conditions, resulting in damage of the containment integrity and releasing radioactive substances into surrounding environment. Therefore, hydrogen elimination inside the NPP containment is an important subject. According to the requirements of NNSA (National Nuclear Security Administration), enough passive hydrogen recombiners (PHR) had been installed in unit 3&4 of Qinshan phase II NPP to prevent the hydrogen explosion in a serious accident. Additionally, new PHRs for unit 1&2 were also added. This article introduces the practical experience for the PHR modification, the comparisons between unit 1&2 and unit 3&4.
Fuel Cell System Performance Prediction Model and Validation Based on Radial Basis Function
Authors: Du Meng Yao , Liu Li , Li Yan Ping , Guo Xiao Song
Published: August 2014

Fuel cells are together used with solar cells and lithium cells in the propulsion system of hybrid UAVs. According to the result of fuel cell’s performance experiment and based on the radial basis function interpolation, a fuel cell system performance prediction model is established. Moreover, the analysis on the model’s result shows a good accuracy of the method and also a good applicability for the preliminary design of hybrid UAVs.
Thermogravimetric Study on the Combustion Characteristics of Corn Stalk and Low Volatile Coal
Authors: Yang Dong , Lou Zai Qiang , Zhang Meng
Published: August 2014

The combustion characteristics of corn stalk and low volatile coal were carried out through the thermogravimetric experiments.The heating rates is 40°C/min.We used the Q50.It is found that the combustion processes of corn stalk and the low volatile coal combustion include moisture evaporation,volatile evolution and combustion,char combustion three stages.The main stage of corn stalk is volatile evolution and combustion and the main stage of low volatile coal is char combustion.Compare the TG and DTG curves of the corn stalk and the low volatile coal combustion we find the corn stalk is easy to be ignited and fires quickly at the atmosphere of pure oxygen.The corn stalk weightlessness mainly happens between 120~300°C,the biggest weight loss rate is 252%/min while the low volatile’s is 56%/min.The firing effect of corn stalk is better than the low volatile’s.
Island Mode of Low Capacity Generators Operation
Authors: Egorov Alexander O. , Eroshenko Stanislav A. , Samoylenko Vladislav O. , Kolobov Pavel V. , Glushkov Daniil A.
Published: August 2014

In this paper advantages and disadvantages of island mode generator operation are considered. There are significant difficulties when it is necessary to provide operational stability and power quality in the system isolated from utility electric power system (EPS). Operation of the isolated system (referred to as “island”) is possible but only in case special technical requirements are met and protection and automation devices are adjusted properly. The absence of technical requirements in Russia led to the necessity of foreign guides and instructions investigation. The analysis of the possibility of foreign experience implementation in the field of autonomously operating systems in Russian power systems is conducted.
Modeling of Aging Transformer Failure Rate and the Retirement Timing Decision
Authors: Sun Yi Qun , Wang Ping Ping , Yang Yun Hua
Published: August 2014

When making an updating strategy for aging transformer, both the condition of transformer and the risk effect of its aging on power system needed to be taken into account. Based on the model of aging transformer failure rate by insulation age, a comparative analysis of the risk caused by aging failure within the planned period and the profit from delaying updating was undertaken; then the optimal timing strategy to retire transformer was developed on the basis of a balance between risk and profit. The analysis of examples indicated that the proposed process of the strategy could be applied to plan the retiring time according to both the actual condition of transformer and the impact of the risk to the grid, thus making full use of transformer and allowing the power company to get the maximum benefit.
Research on Parameter Stability Region of Governor System
Authors: Weng Hong Jie , Xu Yan Hui , Wang Zhen Zhen
Published: August 2014

The root-locus technique in automatic control theory was applied to study the effect of power-frequency control system parameter on power system dynamic stability. The one machine infinite bus system model with power-frequency control system was established and the corresponding root-locus equation was deduced. The parameter stability region of power-frequency control system to ensure the power system dynamic stability was achieved through drawing root locus graphs of different system running modes. If the gain value of power-frequency control system is higher than the critical value, power system low frequency oscillation will occur. The above conclusion was validated by time domain simulation results.
A Chaos Particle Swarm Optimization Algorithm for Optimal Power Flow
Authors: Xia Cheng Jun , Zhou Yun , Huang Hao Yu
Published: August 2014

The chaos particle swarm optimization algorithm was presented to solving optimal power flow. The proposed OPF considers the total cost of generators as the objective functions. To enhance the performance of algorithm, a premature convergence strategy was proposed. The strategy can be divided into two parts. In the first part, a method is introduced to judge premature convergence, while another part provides an advance method to improve the performance of algorithm with searching the solution in total feasible region. The control strategy used to prevent premature convergence will obtain starting values for initial particle before program iterating, so it can provide bitter probability of detecting global optimum solution. The simulation results on standard IEEE 30-bus system minimizing fuel cost of generator show the effectiveness of the chaos particle swarm optimization algorithm, and can obtain a good solution.
A Novel System Splitting Scheme Based on the Identification of Weak Connection
Authors: Xia Cheng Jun , Chen Cui Qiong , Men Kun , Yan Ji Xue
Published: August 2014

In this paper, a new system splitting scheme based on the identification of weak connection is proposed. This paper firstly claims that if two nodes in a transmission line are related to two different generator groups or irrelated to any generator group, the transmission line is regarded as weak connection. And matrix R is presented to reflect the relevance between load nodes and generator groups after faults are cleared. The candidate strategy space is composed of these transmission lines of weak connection. Secondly, the procedure of searching the splitting surfaces is listed to illustrate how the splitting scheme works. Finally IEEE 39-bus system is used to verify the feasibility of this splitting scheme.
An Investigation of the Negative Resistance in Network Reduction and Electromagnetic Transient Modelling
Authors: Xia Cheng Jun , Liang Guo Kai , Huang Hao Yu
Published: August 2014

It becomes common practice to reduce a large-scale power grid into a simplified one using transient stability simulator and have it modeled on electromagnetic transients programs. However, the procedure of network reduction may produce negative resistance, which may result in some problems in electromagnetic transient simulation. This paper firstly demonstrates that the negative resistance will probably lead to numerical instability in electromagnetic transient simulation. And then the forming mechanism of the negative resistance during network reduction using Gaussian Elimination is revealed. Several schemes for negative resistance elimination are presented at last.
Research on Control Method and the Structure Design of Asynchronous Modular Contactor
Authors: Zong Ming , Cao Zheng Di , Dong Tian Yu
Published: August 2014

Contactors as low-voltage electrical products are largely used, contact bounce when contactor closing and arc which produces during opening is the main factor influencing a contactor’s life. This paper proposed a new structure that asynchronous modular, N-pole contactors consist of N independent contact systems, achieved each contact individually controlled by closed-loop control. This is a new idea in the field of structural design and control of contactors. This paper designed the structure size of the electromagnetic system, used Simulink software to build the model, studied dynamic characteristics of the contacts, and obtained a new closed-loop control method at last. This new method can effectively eliminate contact bounce when the contact closing and the arc generated when breaking, and increases the service life of the contactor.
Design and Development of Power System for Transmission Line Online Monitor Device
Authors: Cai Zi Jian , Feng Zheng Hua
Published: August 2014

The utility model provides a transmission line on-line monitoring system powered devices, including power generation systems, and power control systems; power system consists of solar panels and batteries composed of the power control system consists of DC-DC converter circuit, voltage and current sampling circuit, microcontroller system and charge-discharge circuit; power control system with maximum power point tracking (Maximum Power Point Tracking: MPPT) control the power output of solar panels; the utility model role is: to improve the transmission line on-line monitoring system for solar energy utilization efficiency , extended battery life, providing a steady continuous power for outdoor transmission line online monitoring system.
Implementation of Experimental Platform of Shipboard Power System
Authors: Shi Wei Feng , Zhang Wei , Zhou Zuo Han , Bao Yan
Published: August 2014

This paper presents an integrated experimental platform of Shipboard Power System (SPS) control system. It was established with equipment of three 100KW diesel generator sets, electric power network, 270KW loads of resistance and inductance, 24KW AC motor drive control system and shipboard automatic power station. The power system and generator sets of experimental platform run under controllers of M340 PLC and PPU. The hardware environment of two layers network is formed for experiments and control programs developing. Field bus and Ethernet technologies are applied for the experimental platform. Combining with some relevant developing software of platform, programs of real time control and electric energy management can be developed and realized for generator sets and electric power network and shipboard power station. Data of SPS experiments can be sampled and recorded in Ethernet computer through sensors, PPU, PLC and Field bus facilities. Also, the functions of SPS characteristic analysis and faults alarming can be implemented by Ethernet computers. This physical experimental platform satisfies the requirements of analysis and research for SPS automatic control.
Research on Intelligent FCL to Realize Seamless Power Supply between the Port and Ship for Energy Conservation and Emissions Reduction
Authors: Xiao Le Ming , Song Yan Qiong
Published: August 2014

The dissertation establishes simulation model of intelligent FCL on-shore controlling circulation current, which can realize effective control of largest ring current when the shore power is connected to ship electrical system, and can further complete seamless connection between ship and shore power, so as to realize the ship energy conservation and emissions reduction in port. And also demonstrates paralleling on-shore control on-shore power grid on the intelligent platform into the ship`s power grid of generators, and FCL uses reactor to control inrush circulation current, which uses finite circulation current to complete the average voltage and automatic synchronization of the generator, being capable of taking the on-shore power into the generator power grid and exiting from that; moreover, parallels intelligent on-shore controlling marine generators of the power grid into on-shore power grid. Basically unchanging the ship power station, realizing uninterruptable power on-shore connection, at the same time realizing the ship electricity pricing such as wisdom.
10KW/100KHZ High Frequency Induction Heating Power Supply Design
Authors: Zhou Mei Lan , Li Yan Ping , Wang Ji Chang
Published: August 2014

TMS320F2812 was taken as the main controlling chip, MOSFET was taken as the inverter switching device and IGBT was taken as the chopper switching device in the system. This paper introduced the main topology circuit design and circuit components selection.In the process of heating, double-closed loop control strategy fuzzy and DPLL (Digital Phase Locked Loop) was adopted. The simulation model of induction heating power system was built in SIMULINK platform. The simulation results indicate that the load frequency automatic tracking and closed-loop power control are realized. The time to steady output is about 0.1ms. Finally, built the 10kW/100kHZ induction heating power supply experimental platform, As can be seen from the experimental waveforms, the equivalent impedance of the load can always be weakly perceptual state.
Realization of NAND FLASH Control Glueless Interface Circuit
Authors: Liu Hai Ke , Wang Shun , Kang Xin Gna , Wang Jin Liang
Published: August 2014

The article realization of NAND FLASH control glueless interface circuit based on FPGA,comparing the advantages and disadvantages of the NAND Flash and analysising the function of control interface circuit. The control interface circuit can correct carry out the SRAM timing-input block erase, page reads, page programming, state read instructions into the required operation sequence of NAND Flash, greatly simplifies the NAND FLASH read and write timing control. According to the ECC algorithm,the realization method of ECC check code generation,error search,error correction is described.The function of operate instructions of the NAND Flash control interface circuit designed in this paper is verified on Xillinx Spartan-3 board, and the frequency can reach 100MHz.
Research on Tuning Protection with Distributed Power Distribution Grid
Authors: Chai Lu , Chen Chen
Published: August 2014

Along with the gradually lack of the fossil fuels, people pay more and more attention to the use of renewable energy. Distributed power supply of a large number of interconnection affects the distribution network power flow direction and size a lot. Thus, the protection setting values of the distribution network line are not accurate, which lead to the refusing action or misoperation. This article uses compensating coefficient based on the consideration of adaptive protection algorithm of distribution network protection value setting, and operate simulation. The simulation results show that this algorithm of adaptive protection is good with different distributed power grid capacity and right protection setting values.
A Closed-Loop Test System for Network Performance of Smart Substation
Authors: Ma Kai , Huang Shu , Feng Shan Qiang
Published: August 2014

The key support technology of smart substation testing technology is analyzed, the concrete application of smart substation is combined with the traditional network testing, and the function of real-time network packet analysis is introduced, which has make the process of smart substation layer network test form a closed loop system, extend and improve the system of smart substation performance test. And links to the reality, to the transformer substation switchboard network storm suppression function, the time delay, lost projects and so on the frame rate to carry on the statistics, the contrast has confirmed this plan feasibility and the validity.
An Improved RBF Neural Network for Short Term Load Forecasting
Authors: Li Chuang , Liang Zhi Qiang , Chen Min You
Published: August 2014

Neural network is widely used in the load forecasting area,but the traditional methods of load forecasting usually base on static model,which cannot change as time goes on. And the accuracy is worse and worse. To solve the problem, a dynamic neural network model for load forecasting is proposed .By way of introduce Error discriminant function, to control the error of load forecasting and dynamically modify the predicting model. Through the contrast of the short-term load forecasting result based on static neural network model and dynamic neural network model proposed, the error of load forecasting is decrease effectively.
A Review of Distribution Network Planning with Large-Scale Intermittent Renewable Energy Access to Distribution Network
Authors: Song Xu Dong , Yu Nan Hua , Liang Jun Jun , Xia Cheng Jun
Published: August 2014

With the rapid development of DG, especially the access of large-scale renewable energy, traditional simple distribution network with unique source turns into ADN with multiple sources, making the distribution network more complicated. In this paper, The power source and grid planning of traditional and intelligent distribution network are discussed, based on which the problems ADN faces and the research difficulty are focused on. The key technology of ADN planning is analyzed, including the uncertainty of load forecasting, the ADN absorption capacity for DG and the cost-effectiveness of ADN planning. Some suggestions for the research direction of ADN in the future are made at the end, providing reference for the ADN planning with large-scale renewable energy access.
Research of “Foreign Electricity to Enter Jiangxi” Ensure Electricity Supply
Authors: Yang Hu Ping , Zhao Jie , Zuo Shi Wei
Published: August 2014

In this article, it describes the energy supply and demand situation in Jiangxi Province. To forecast the electricity demand in Jiangxi Province, in-depth analysis the significance of implements the strategy of “Foreign electricity to enter Jiangxi”. In accordance with the national UHV power grid development plan, Combined with characteristics of Jiangxi 500 kV main grid architecture, formulate overall objectives and specific programs of “Foreign electricity to enter Jiangxi”, put forward “Foreign electricity to enter Jiangxi” strategy safeguards.
Searching Method of Core Backbone Grid Based on Biogeography-Based Optimization Algorithm
Authors: Zou Hong Bo , Wang Fei , Ke Lina , Yin Ting Ting
Published: August 2014

Constructing backbone grid is important means of carrying out differential planning to improve power system’s ability of resisting natural disasters. A searching method of core backbone grid with the target of the smallest total lines and nodes and the largest integrated survivability index based on the index system of survivability was put forward with constraint conditions of network connectivity and power grid’s safe operation. The biogeography-based optimization algorithm was introduced to search for the optimal core backbone grid. Compared with particle swarm optimization (PSO), binary ant colony algorithm (BACA), genetic algorithm (GA), the proposed method is accurate and effective, and it has the merits of better convergence speed and convergence precision.
Economic Evaluation Model of Grid Construction Project Based on Real Option Theory
Authors: Chen Liang` , Liu Zhi Yan , Huang Kang Ren , Du Min
Published: August 2014

This paper combined with the real conditions on investment and decision-making of grid construction. Considering the uncertainty of project, we applies real option theory into evaluation model of grid construction and establishes evaluation model of grid construction based on real option theory. The result indicates that proper application of real option method into the investment decision-making model of grid construction can better enable grid to obtain profit from investment uncertainty, which provides larger profit and opportunity for grid corporation.
Application of Distributed Generation in the Emergency Control of Power Supply Systems
Authors: Chechushkov Dmitrii , Novikov Yakov
Published: August 2014

In this paper, a new approach to emergency management systems supply. Method aims to increase the reliability of power supply to consumers. The mathematical model of assessing the impact of distributed generation sources (DP) to improve the reliability of power supply, as an algorithm to find the optimal combination of DG used genetic algorithm. The results of experimental calculations and comparative analysis of the algorithm is show.
Optimization of a Sintering Waste Heat Power Unit
Authors: Gong Xue Min , Yang Jiu Lin , Wang Chen
Published: August 2014

An optimization was performed for a sintering waste heat power unit with all data obtained in the site and under the unit normal operating conditions. The physical and mathematical model for the process of cooling and generation is established, which makes the net power generation as an objective function of the cooling machine imported ventilation, the thickness of sinter and the main steam pressure. Optimizing for single parameter, we found that each parameter had an optimal value for the system. In order to further optimize the system's operating parameters, genetic algorithm was used to make the combinatorial optimization of the three parameters. Optimization results show that power generation capacity per ton is increased by13.10%, and net power generation is increased by 16.17%. The optimization is instructive to the operation of sintering waste heat power unit.
Numerical Simulation of Three Dimensional Unsteady Flow of the Ruston Turbine in Stirred Tank
Authors: Wang Xiao Bing
Published: August 2014

Unsteady flow of a single six-blade ruston turbine in stirred tank is numerically simulated by using the large eddy simulation. Then the effect of the turbine installation position on mixing flow field is studied. The result shows that with a relatively low paddle installation position, mixing effect at the bottom of tank is obvious, while which go against the materials at the top layer mixing. When the paddle is installed at the top of the stirred tank, liquid splash and a concave downward liquid surface are easily caused. Finally the cavitation phenomenon is generated. When the paddle is installed from 1/3H to 2/3H, there are a uniform flow field distribution and higher average velocity flow. Large size vortex structures at the top and the bottom of the paddle are obvious which is beneficial to mix the materials.
The Waste Collection Vehicle Arc Routing Problem with Turn Constraints
Authors: Liu Jie , He Yan Feng , Zhang Ai Ping
Published: August 2014

To reduce the route length of MSW collection without intermediate facilities, A Waste Collection Vehicle Arc Routing Problem with turn constraints (WCVARPTC) model was proposed, which considers the actual traffic regulations: some streets can be traversed in only one direction; some turns will be forbidden when the common angle is too narrow. An asymmetric vehicle node routing problem (AVNRP) model was formulated to reduce the scale of the WCVARPTC. And a MULTI-ACS algorithm was designed for solving such an asymmetric one. The results of 2 benchmark instances for CVARP indicate that the best solutions has approached the best known solutions with deviation 0.28% and 0.16% respectively.
Effect of Total Solids Content on the Biogas Production and Phosphorus Release from Excess Sludge
Authors: Liu Xiao Ling , Wang Meng Meng , Hu Xue Jing , Song Yong Hui
Published: August 2014

Anaerobic digestion and struvite precipitation were the two effective ways to treat excess sludge for recovering the bioenergy (biogas) and phosphorus. The total solids content played an important role in the biogas production and the phosphorus release. The experimental results showed that cumulative biogas decreased significantly with the increase of total solids content from 5% to 10% but increased subsequently with a further increase of total solids content, and the maximal cumulative biogas was achieved at 5% of total solids. The concentrations of PO43-P and total soluble P varied with total solids content, and the maximal concentrations were obtained under the condition of 20% of total solids, namely 1327 mg·L-1for PO43-P and 1288 mg·L-1for total soluble P. Pearson’s relationship analysis reflected that the released total soluble P was mainly composed of PO43-P during the anaerobic digestion. Furthermore, the maximal yield of PO43-P and the maximal solubilization ratio of total P were achieved at 15% of total solids, and they respectively reached 4.2 mg·g-1and 16.1% with 48% reduction of volatile solids and 40% reduction of total solids after anaerobic digestion.
A Study on a Green Route to Preparation of Silica Powders with Rice Husk Ash
Authors: Yang Ze Xin , Dong Lin , Wang Meng , Li Huan
Published: August 2014

The main purpose of this article is to develop an environmentally friendly and economically effective process to produce silica from rice husk ash. Sodium silicate solution was prepared by the reaction of rice husk ash and sodium hydroxide solution, and then the sodium silicate solution was used as the raw material for the preparation of silica with sodium bicarbonate. During the reaction, the by-product can be passed into CO2 to prepare sodium bicarbonate what can be reutilized. Experimental route achieved resource recycling and environment-friendly, low energy consumption, zero emissions and so on. Meanwhile the microstructures of the silica powders were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Thermo gravimetric/Differential thermal analyzer (TG-DTA).The purity of silicon was up to 99.43% and the particle size was 200-300nm.
Modeling of Groundwater Flow and Contaminant Transport in Two-Dimensional Geometries in an Unconfined Aquifer
Authors: Dimane Fouad , Hanafi Issam , El Himri Abdelouahad , Haboubi Khadija , Mata Cabrera Francisco , Tejero Manzanares José
Published: August 2014

Models of groundwater flow are widely used for a variety of purposes ranging from water supply studies to designing contaminant cleanup. In general, groundwater flow system can be divided into steady-state and transient. In the present work, we investigate the usefulness of finite element method in modelling of steady-state subsurface fluid flow and transient solute transport along a vertical cross section in an unconfined aquifer. Details are explained on numerical approximations leading to different numerical results. Extensions for pollutant transport are mentioned.
A Hybrid ARIMA and BP Neural Network Model to Forecast Industrial Water Use Efficiency
Authors: Fan Xing Hua , Ning Cheng
Published: August 2014

Accurate prediction of water use efficiency is very important to water management.We proposed a hybrid autoregressive integrated moving average (ARIMA) and Back Propagation (BP) neural network model to predict industrial water use efficiency. The procedure of the hybrid model consisted three steps: linear modelling, nonlinear modelling and combining. Jiangsu province was selected as a case study area. Empirical results show good fitness of the hybrid model. Based on the empirical forecasting results, policy suggestions are provided to strengthen management of water resources.
Stable Isotopes Analysis of Precipitation in Subtropical Plateau of Yunnan
Authors: Guan Wei , Fan Tao , Zhu Xiu Qin
Published: August 2014

To elucidate the relationship between stable isotopes of precipitation (SIP) and the extreme drought in Kunming area, based on the stable isotopes data of the GNIP in Kunming site from 1986 to 2003, the precipitation line equation is brought forward and the seasonal change rule of stable isotopes are discussed. The stable isotopic compositions of precipitation exhibit great diversities in different seasons during to influences of multiple factors, such as monsoon, rainfall amount moisture source and others. The δ18O values in rainwater exhibit significant seasonal variations, the average of-10.12‰ in rainy season, the dry season is-4.5‰, having lower values in the rainy season and higher one in the dry season. The amount effect of precipitation is very distinct, that concealed the temperature effect. Got the special geographical position,dvalues present unique characteristics, the average ofdvalues is 10.78‰ in rainy season, and is 4.86‰ in dry season, the mean value is generally lower than most parts of the world.
Causes and Social Governance of the Water and Soil Loss in Ethnic Mountainous Areas — Based on the Empirical Study of ENSHI City
Authors: Tan Xian Chu
Published: August 2014

With the speeding up of the social transformation and the deepening of market economy, soil and water loss problem is increasingly appearing, and so it has becoming the core issue of ecological environment construction. This article attempts to field research as a logical starting point, combined with related literature, in order to Enshi G County as a case, not only discusses the basic situation of soil and water loss and its harm to ecological environment but also analyses its multi-dimensional causes. In the meantime, this paper argues that the effective governance of the soil and water loss lies in government-led social governance model, and also initial shows its policy implications.
Analysis of Variance about the Sadiment Size in Jiuyuangou and Tuwei River Watershed’s Silt Dam
Authors: Li Li , Sun Wei Ying , He Qi , Hou Xin Xin
Published: August 2014

Analysising twenty-one silt dams in Jiuyuangou watershed and thirty-six silt dams in Tuwei River Watershed drilling hole sampling’s data, Jiuyuan gou Watershed’s silt dams in coarse sand size mainly concentrated in the 0.05mm,Tuwei River Watershed’s silt dams in coarse sand size mainly concentrated in the 0.05mm~0.10mm,The dam upstream sand size is generally larger than the dam downstream, sorting depends on sediment dam on the dam upstream tosand size, dam upstream sediment grain size is coarse separation effect is better, warping dam and reduction effect is more obvious.
The Spatial Patterns of Plant Population Distribution at the Barren Slopes in the Arid Valley along the Upper Reaches of Minjiang River
Authors: Can Yang , Yang Zi Song
Published: August 2014

Through the variance/mean ratio index, the patchiness index, the Morisita index, the intensity index and the crowded mean index, the studied results present that:1) the variance/mean ratio index, the patchiness index and the Morisita index of the 17 plant populations are significantly greater than 1 suggesting a typical clumped type;2) the average of crowded mean index is between 14.4 and 488.95, of which 5 are greater than 100 occupying 29.41 %, 4 are greater than 50 occupying 23.53 %, and the intensity index of all ranges from 0.21 to 3.59, and is significantly less than 8. Of all, 11 are greater than 0 and less than 1, occupying 64.71 %. The aggregation degree of the spatial patterns is generally high and is significantly different among varied populations.
The Analysis of Vegetation Phenology and Climate Change in the North-South Transect of Eastern China
Authors: Wang Zhi , Liu Shi Rong
Published: August 2014

In order to explore additional distribution patterns of global change to terrestrial ecosystems, phenology refers to seasonal biological life stages driven by environmental factors, and is considered to be a sensitive and precise indicator of climate change. Therefore, the author developed a ‘bottom-up’ method for first determining the phenological growing season at sample stations, and based on NOAA/AVVHRR, meteorological data, ground phonology observation data, vegetation category data, and so on. The author built a Logistic fitting model on cumulative frequency of NDVI to determine length of greenness period since 1982, then analyzed correlation between NDVI and precipitation, primarily revealed the dynamic mechanism of climate on vegetation. The spatial pattern of average turning green and wilting dates of the growing season correlated significantly with the spatial pattern of average temperatures in spring and winter across the north south transect of eastern China during 1982 to 2003; the growing season extended on average by 5 to 8 days . Temperate desert regions had the trend of increase of desertification.
Study on the Application and Comparative Analysis of Land Surface Temperature Retrieval Method Based on Multi-Sensor Remote Sensing Data
Authors: Na Yin Tai
Published: August 2014

The three commonly used remote sensing land surface temperature retrieval methods are described, namely single-window algorithm, split window algorithm and multi-channel algorithm, which have their advantages and disadvantages. The land surface temperature (LST) of study area was retrieved with multi-source remote sensing data. LST of study area was retrieved with the split window algorithm on January 10, 2003 and November 19, 2003 which is comparatively analyzed with the LST result of ETM+data with the single-window algorithm and the LST result of ASTER data with multi channel algorithm in the same period. The results show that land surface temperature of different land features are significantly different, where the surface temperature of urban land is the highest, and that of rivers and lakes is the lowest, followed by woodland. It is concluded that the expansion of urban green space and protection of urban water can prevent or diminish the urban heat island.
Suitability Evaluation on Land Reclamation in Hebei Fanshan Phosphate Mine
Authors: Zhang Qing Jun , Lu Jun Na
Published: August 2014

Suitability evaluation is the important basis for scientifically determining the direction of land reclamation. This paper deeply elaborates the goal of land reclamation and the principles of suitability evaluation. land reclamation direction of the project area is initially determines to be cultivated land, forest land, grassland and garden plot based on region land-use planning and analysis of natural factors, socio-economic factors, policy factors of the mining area; the evaluation index system including five involved factors is constructed, and the suitability evaluation of evaluation units is carried out by the comprehensive index method and extreme conditions. Based on above-mentioned evaluation, the land reclamation direction of 14 evaluation units are ultimately determined by comprehensive analysis of the local natural conditions, social conditions and so on.
Extraction of Prospecting Information for Sedimentary-Metamorphic Type Iron Deposit Based on Ziyuan-3 Satellite Data — Taking Xinjiang Taxkorgan Area as an Example
Authors: Chen Ling , Zhou Yan , Zhang Wei
Published: August 2014

In this study, the significance and content of prospecting information of sedimentary-metamorphic type iron deposit are expounded. Ziyuan-3 high spatial resolution satellite data are used to extract the prospecting information of sedimentary-metamorphic type iron deposit in taxkorgan area in Xinjiang. By using the pertinent methods of image processing, the information of ore-bearing bed, ore-control structures have been extracted, and based on the ferric altered mineral spectrum characteristics, the ratio method also has been used to extract iron mineral anomalies in study area. Based on the ore-control structure, ore-bearing rocks and ferric anomalies information, 2 remote sensing prospecting targets have been circled. Our research have laid foundation for the evaluation of mineral resources in this region, and also broadened the thinking for domestic high resolution image scale application in geology and mineral resources.
Petrologic Characteristics of Dawsonite-Bearing Sandstones in Dongying Sag of Bohai Bay Basin, China
Authors: Li Fu Lai , Li Wen Shuai , Duan Zhong Feng , Deng Yan
Published: August 2014

A large number of dawsonite-bearing sandstones has been found in Dongying Sag of Bohai Bay basin. The petrological characteristics of these sandstones, such as the framework clastic composition, cements, authigenic minerals and diagenetic paragenesis succession are investigated by polarizing microscope, SEM, and Alizarin Red-S staining etc. The results show that these kinds of dawsonite-bearing sandstone are feldspathic sandstone or debris-feldspar sandstone with mainly fine or fine to medium particle size, poor to mediocre sorting features, poor psephicity and dot-line contact. The cements and authigenic minerals are dominated by overgrowth quartz, dawsonite, calcite, ferrocalcite, ankerite and clay minerals. The amount of dawsonite accounts for 15% by volume. The paragenesis sequence are illite/montmorillonite mixing layer, kaolinite, overgrowth quartz-calcite, ferrocalcite, dawsonite and ankerite.
Paleozoic Orogenic Activity of the Kanggurtag-Yamansu Ductile Shear Zone in the East Tianshan Orogenic Belt, SW China
Authors: Guan Hui Mei , Wang Zong Xiu , Xiao Wei Feng
Published: August 2014

Kanggurtag-Yamansu ductile shear zone is the largest ductile shear zone in the East Tianshan orogenic belt. Deformation characteristics and structural associations of the shear zone suggest that the shear zone was formed by Nearly N-S compression duing late Carboniferous-early Permian. Which confirmed that the Eastern Tianshan mountains along the southern edge of the Turpan Basin were the results of plate interactions in Late Paleozoic.
Antioxidant Defense Enzymes Response Following Polychlorinated Biphenyls Exposure to Eisenia fetida in Actual Polluted Soil
Authors: Shen Dong Sheng , Tao Xiao Qing , Shen Chen Chao , Shentu Jia Li , Wang Mei Zhen
Published: August 2014

The responses of antioxidant systems after exposing Eisenia fetida to actual soil contaminated with PCBs were investigated. Among antioxidant enzymes, the primary response to early PCBs exposure can be attributed to catalase (CAT) and peroxidase (POD). These two enzymes could have a combined effect on fighting damage by reactive oxygen species. An obvious increase in the activity of CAT was recorded at 4 mg kg-1compared to the control throughout the whole test days. PCBs exposure caused changes in POD activity in 2d and 4d. However, the activity of POD inE. fetidatissues changed little with PCBs concentrations in day 8 and 16d. Superoxide dismutase (SOD) changed little with PCBs in different time. The results suggest that the variations in CAT and POD ofE. fetidacould be used as early responsive biomarkers for oxidative stress caused by PCBs in a soil environment.
Coordinate Responses of ABA Accumulation against Drought at Physiological, Ecological and Molecular Levels in Triticum aestivum
Authors: Tian Wei Li , Song He Hui , Mei Xu Rong , Li Yu Zhong , Guo Jia Xuan
Published: August 2014

Much progress has been made toward understanding plant drought resistance. However, the coordinate responses of plant to drought on the basis of ABA level at physiological, ecological and molecular levels remains unclear. Here, the potted winter wheat (triticum aestivum) was cultivated under relative soil moisture (RSM ) respectively at 85% (well-watered), 65% (moderate stress), and 45% (severe stress), and a series of physiological and ecological parameters including ABA level, stomatal conductance, leaf temperature, leaf water potential, together with transcripts of ABA biosynthesis-metabolism key genes including9-cis-epoxycarotenoid dioxygenase(TaNCED),ABA glucosyltransferase(TaGT),ABA8'-hydroxylase(TaCYP707A), andβ-glucosidase(TaBG) were carried out. We found that ABA contents responsive to soil water loss increased rapidly and showed a significantly-negative correlation with the stomatal conductance and the leaf water potential and a significantly-positive correlation with the leaf-air temperature difference, respectively. The continuous accumulation of ABA was resulted mainly from the increased transcripts of bothTaNCEDsandTaBGsgenes. The transcripts ofTaCYP707A1andTaGTdeclined sharply from 85% to 65% RSM and then increased slightly from 65% to 45% RSM, indicating that ABA metabolism not only accelerates the accumulation of ABA level but also contributes to maintain ABA homeostasis. In conclusion, the macroscopic-microscopic changes responsive to water deficient reflects the ABA-regulated, drought-resistance coordinate mechanisms at physiological, ecological and molecular levels intriticum aestivum.
Selection and Application of Ventilation System’s Sensitive Branches Based on the Sensitivity
Authors: Hu Li Ming , Jiang Shu Guang , Dong Shi Bao
Published: August 2014

By analyzing the ventilation system’s sensitivity and studying the ventilation pipeline model, it puts forward the concept of sensitivity branch and the selection method, i.e. selecting the top 20% branches which have the biggest α value. Sensitivity branch plays an important role in managing the ventilation system efficiently, judging the abnormal wind amount and guiding the construction of new mine alleys.
A Study on the Application of RBF Neural Network in Slope Stability of Bayan Obo East Mine
Authors: Wang Chuang Ye , Zhang Fei , Han Wan Dong
Published: August 2014

RBF neural network is a well-behaved feed forward network and with it the nonlinear evolution of slope stability could be obtained by learning the sample repeatedly, which really possesses a better approximation and globe optimum features. The prediction model of slope stability based on RBF neural network has the advantages of simple structure, fast learning and precise forecasting. Through the calculation of three engineering examples in Bayan Obo east mine, the analysis method of slope stability based on RBF neural network is proved to be functional and effective.
Cemented Filling Mining Technology in Continuous Miner Filling Mining Face
Authors: Liu Peng Liang
Published: August 2014

Based on interval arrangement characteristics of the mined branch roadways and pillars in continuous miner filling mining gob,the cemented filling mining thought which divided mining and filling both into two stages was put forward.The first stage was mining branch roadways and then filling gob with cemented materials in time, and the second stage was mining pillars and filling gob with the first stage filling body support when it meet designed strength. Industrial field test showed that branch roadways were smoothly mined and filled, filling body strength meet demand and pillars were safety mined out.Continuous miner filling mining technology could reache high production efficiency based on advantages of mining and filling parallel operation and filling spaces constructing easily.
Sensitivity Analysis of Slope Stability Influence Factors Based on BP Neural Network
Authors: Wang Chuang Ye , Zhang Fei , Han Wan Dong
Published: August 2014

There are many factors which influence the slope stability. In order to analyze the degree of importance of each influence factor on slope stability, this paper establishes a slope stability analysis model based on BP neural network. The computation results showed that the model was reasonable and reliable. On this basis, the sensitivity of various influence factors to slope stability was analyzed by single-factor test, which were internal friction angle of rock, bulk density, pore pressure coefficient, slope angle, rock cohesion and slope height in a descending order of sensitivity.
DFT Study of the Effects of Co and Ni Impurities on the Properties of Pyrite Surface
Authors: Huang Rong Qiang , Li Yu Qiong
Published: August 2014

The Co- and Ni-bearing pyrite (100) surfaces were studied using density functional theory (DFT). The calculated results show that the covalency of the bonds on surface is weakened due to the presence of Co or Ni impurity, especially for the Ni-bearing pyrite surface. Hybridization occurs between Co 3d and S 3p and between Ni 3d and S 3p. The electrical conductivity of surface is enhanced due to the presence of Co and Ni impurities. Surface Co atom is predicted as spin-polarized and surface Ni atom is calculated as low-spin state.
Process Mineralogy of Jinshan Gold Ore Based on Mineral Liberation Analysis System
Authors: Cai Liu Lu , Liu Shuang , Li Wen Juan , Zhou Cheng Ying , Qu Wei , Song Yong Sheng
Published: August 2014

Traditional measurement and modern SEM-based mineral liberation analysis (MLA) system were employed to obtain the process mineralogy characteristic of Jinshan gold ore which had high Au (6.20g/t) and low sulfide (0.25%). XBSE, XBSE_STD and SPL_Lt MLA modes are used in this case, which make the results timely, reliable and quantitative. The gold behaves irregular granular native gold or silver-bearing native gold of which the Au content ranging from 93%to 100%. Gold mainly occurred as liberated or in gold-carrying gangue minerals, such as quartz and biotite,rarely in pyrite in the form of fissure gold, inter-crystalline gold or inclusion gold . The particle size of the Gold minerals range from 0.001mm to 0.010mm , which is too fine to recover from beneficiating method. Combined process should be adopted.