bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Physical and Electrochemical Hydrogen Storage Kinetics of the As-Spun Mg2Ni-Type Alloys by Substituting Ni with M (M=Co, Cu)
Authors: Zhang Yang Huan , Li Bao Wei , Ren Hui Ping , Pang Zai Guang , Hou Zhong Hui , Zhao Dong Liang
Published: January 2012

In order to improve the physical and electrochemical hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by M (M=Co, Cu). Melt-spinning technology was used for the preparation of the Mg20Ni10-xMx (M=Co, Cu; x=0, 1, 2, 3, 4) hydrogen storage alloys. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The physical and electrochemical hydrogen storage kinetics of the alloys is measured. The results show that the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, whereas the as-spun (M=Co) alloys exhibit a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of M (M=Co, Cu) for Ni engenders an insignificant effect on the hydrogen absorption kinetics of the alloys, but it markedly ameliorates the hydrogen desorption kinetics of the alloys and the high rate discharge ability. With an increase of the M (M=Co, Cu) content from 0 to 4, the hydrogen desorption ratio ( ) is enhanced form 20.0% to 65.43% for the as-spun (20 m/s) alloy (M=Co), and from 20.0% to 52.88% for the as-spun (20 m/s) alloy (M=Cu).
Fabricating TiO2 Coated ZnO Nanowire Array/Graphene Heterostructure
Authors: He Yong Qiang , He Si Yao , Zhang Na Na , Wang Wen Chao , Sun Hong , Wang Wei , Qiu Hai Xia
Published: January 2012

ZnO nanowire array supported on the graphene surface was fabricated by thermo hydrolysis method. The ZnO nanoparticles (seed crystals) were first deposited on GO surface and then ZnO nanoparticles grew to ZnO nanowire array when the seed crystal side was hung upside down and touched with ZnO precursor solution during the process of thermo hydrolysis. The ZnO nanowire array was then coated with TiO2 precursor, hydrolyzed and turned to crystalline TiO2. The formed ZnO/TiO2/graphene composites have different structure depending on the reaction conditions and their morphology was observed with scanning electron microscopy.
Influence of KF Concentration on Thickness and Energy Consumption of Micro-Arc Oxidation Coatings on LY12 Aluminum Alloy Substrate
Authors: Chen Jing , Xu Jin Yong , Zhao Jia Chen , Gao Cheng , Wang Gui
Published: January 2012

In this paper, ceramic coatings were produced on LY12 aluminum alloy by the micro-arc oxidation (MAO) technique in an alkali sodium silicate electrolyte consisting of different KF concentrations(0~15g/l). The influence of KF concentration on making energy consumption and thickness of the MAO coatings was studied. Results revealed that increasing KF concentration caused an increase in the thickness and roughness of coatings and a decrease in the average energy during the MAO process. In response to the increase in KF concentration, the little content of F- in the coatings were increased simultaneously. However, the phase structure and composition of the coatings hardly varied with different KF concentrations. Moreover, it was observed that the coatings produced in electrolytic solution with 10g/L concentration of KF obtained an excellent thickness and making energy, but the coatings were ablated locally with the KF concentration of higher than 10g/L for more than 60 minutes.
Research on the Straightening Deformation Process of the Residual Stress of the Numerical Simulation for Different Kinds of Heavy Rail
Authors: Liu Yu Yan , Li Hao , Chen Lin
Published: January 2012

Through out the establishment of heavy rail entity model and the finite element model of straightening for different kinds of heavy rail after the residual stress in straightening investigated . Analysed U75V、U76CrRE、U71Mn and U75VM the four different kinds in 8+1 level straightening of the seven regional deformation area rail head, rail waist, rail base vertical stress distribution rule.
Solidification Simulation of Large Flat Ingot in Different Intensive Cooling Conditions
Authors: Lv Nan , Li Sheng Li , Jin Yong Long , Ai Xin Gang , Zhang Dong Wei
Published: January 2012

The production of huge rectangular ingots becomes crying needs in the condition of lots of heavy plate mills more than 5m have been in operation. In this paper, we simulate the solidification of 60t Q235 huge rectangular ingot with ProCAST in different cooling conditions such as air cooling, forced air cooling and water cooling. The results show that solidification time in forced air cooling and water cooling shortened than that in air cooling respectively by 0.9 hours and 2.2 hours; The primary fine-grain area is large in the forced air cooling and water cooling. In forced air cooling , we can obtain the largest equiaxial crystal ratio and the minimum columnar crystal ratio; The shrinkage cavity position of the ingot in forced air cooling and water cooling is closer to riser than it is in air cooling, but the volumes of shrinkage cavities respectively increased to a greater extent than in air cooling.
Synthesis of a New Platinum Acetylide Polymer with a Pyrimidine Moiety for Organic Solar Cells
Authors: Li Li , Sun Xiao Xia , Hu Yu , Wu Qiu Hua
Published: January 2012

A soluble, solution-processable metallopolyyne of platinum (II) functionalized with electron-deficient pyrimidine spacer was synthesized. The spectroscopic and photophysical properties of the polymer was also presented.
Shape-Controlled Pd Nanoparticles in the Mixed Surfactants by Ultrasonic Irradiation
Authors: Wang Yan Li , Zhang Ming Xu , Tan De Xin
Published: January 2012

nanoPd nanoparticles were prepared using ultrasonic irradiation in the PdCl2/H2O/EtOH solution by the addition of a quantity of hexadecyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfonate (SDS) . The products were characterized by XRD、TEM and low temperature nitrogen adsorption-desorption. The effects of the composition of CTAB and SDS on the growth morphology of palladium nanoparticles were investigated. The results indicate that the size and morphology of the nanoPd particles were controllable by adjusting the ratio of CTAB and SDS. The polygonal nanoPd particles with a distributed size of 10-20 nm were obtained when the molar ratio of CTAB:SDS was 1:1 and the reaction time was 60min. The nanoparticles obtained by addition of two surfactants (CTAB and SDS) increased the BET surface area by 14 m2∙g-1compared to that obtained without surfactant.
Model and Analysis of Flexural Properties of Al2O3 Ceramic Prepared by Centrifugal Slip Casting Using BP Neural Network Model
Authors: Yu Jing Yuan , Li Qiang , Sun Xu Dong
Published: January 2012

BP neural network model was developed for prediction of the flexural properties of Al2O3 ceramic prepared by centrifugal slip casting. In this paper, the model can well reflect the relationship between the process parameters including solid content of Al2O3 ceramic slurries (w), centrifugal acceleration (v), sintering temperature (T) and flexural properties of sintered products including fracture strength ( ) and fracture toughness (KIC). According to the registered BP model, the effects of w, v and T on and KIC were analyzed. The predicted results agree with the actual data within reasonable experimental error, which shows that the BP model is a practically very useful tool in the flexural properties prediction of the Al2O3 ceramic prepared by centrifugal slip casting. The system reduces the time required for planning and optimizing of centrifugal process parameters.
Temperature Field of Doublet-Wells Aquifer Thermal Energy Storage in Sanhejian Coal Mine
Authors: Zhang Yi , Guo Dong Ming
Published: January 2012

Utilizating of tube-well irrigation, the technology of aquifer thermal energy storage (ATES) store rich cold energy in winter and cheap warm energy in summar into aquifers seasonally. In this paper, taking Sanhejian Coal Mine as an example, we discuss that with the same pumping and irrigation flow in doublet wells, distribution and change of temperature field in aquifers both at the end of energy storage and after the period of no pumping and no irrigation. The simulation results of aquifer temperature field show that 2~10°C water body of aquifers is decreasing in the period of no pumping and no irrigation, but it is only a small reduction with a stable trend. And after the period of no pumping and no irrigation, about 11°C water body of aquifers stores steadily in the aquifer, so the selected aquifers is suitable and its effect of energy storage is good.
Numerical Study on the Impact of the Sewage Drainage on Water Quality of Shanghai Water Sources
Authors: Gu Jie , Li Wen Ting , Huang Jing , Han Bing
Published: January 2012

A 2D current and water quality model was set up with Delft3D-FLOW in this research, which was well calibrated and verified with the observed tidal levels and velocities. Considered with the project of the Qingcaosha Water Source, Pollution concentration distribution caused by sewage outfalls in the south bank of the Yangtze River during a neap tide of dry season is simulated and the computed results show: a high pollution zone appears near the south shore, and moves upward with flood flow and downward with ebb flow, however, it is bounded a limit region around the outfalls. During the tidal period, the water quality of the Qingcaosha water source can be classified as the second class water, which can ensure the normal water supply as the Shanghai water source. It is suggested that the regular monitoring water quality in this high pollution zone should be put into practice to ensure the water quality of water sourecs. The Yangtze River is adjacent to the East Sea and it’s the largest river in China, with obvious seasonal variant runoff and tidal flow. The Yangtze River was bifurcated by Chongming Island to south and north branch from Xuliujing, most of the flow go down through the south branch. The south branch was divided into south and north channel by Changxing Island and Hengsha Island. The south channel was bifurcated by Jiuduansha Shoal to south and north passage, three bifurcation areas and four estuarine outlets were formed (see Fig 1.)
Reliability Analysis of Sub Assemblies for Wind Turbine at High Uncertain Wind
Authors: Sunder Selwyn T. , Kesavan R.
Published: January 2012

The wind energy plays a vital role in the world renewable energy scenario. The modern wind turbine system has a complex and repairable components due to sophistication and centralized control. The failure characteristics of the onshore wind turbines depend on the terrain conditions. In the main mountain pass and hill area, there is a heavy uncertainty in the wind that is due to the frequent change in the direction of wind and the change in the velocity. It causes a rapid failure in the individual sub assemblies. There is a substantial need for improving the reliability in the stages of design, manufacturing, operation and maintenance. Normally the infant mortality failures are more in the onshore wind turbine and the failure rate is constant during normal operating period. It is a surprise that the failure rate has rapidly increased during normal operating period of the wind turbines placed exactly in the mountain pass and hilly area due to the high uncertainty in the wind. This paper deals with reliability analysis of major components of wind turbine system and its sub system such as rotor system, gear box, brake system, generator, hydraulic system and yaw system. This paper also investigates the reliability of wind turbines and its sub assemblies placed at Aramboly pass in India by using Weibull software as reliability tool for a grid connected 250 kW wind turbine. This analysis yields some surprising results about some sub assembly like yaw system, brake system and generator which are most unreliable.
Sea Waves Power Generation by Using a Permanent Magnet Rotary Generator Drive: A Case Study in Gulf of Thailand
Authors: Phaiboon S , Phokharatkul P
Published: January 2012

This paper presents an electric generating from sea waves in gulf of Thailand. The design procedure and modeling metrology were performed for a rotary permanent magnet generator. A hydraulic system which consists of a floating buoy with vertical movement drives the rotary generation using gear box driving system. The appropriate coupled mechanic models for the proposed generator and the hydraulic system have been developed for maximum power generation. A 1 kW prototype power unit has been performed at the Sirindhorn international environmental park to verify the proposed models.
Current Situation and Abatement Potential of SO2 Emissions from Coke Making Industry in China
Authors: Tian He Zhong , Ke Cheng , Xu Jia Yu , Hao Ji Ming
Published: January 2012

With the rapid development of iron and steel industry, high temperature coking has become an important application of coal. H2S of coke oven gas(COG) and its combustion products --SO2 has aroused more and more concern for the negative effects on environment and human health. The total coke production is about 335.53 Mt in 2007, and the caused SO2 emission is reported at about 181.19 kt. In reference to future development objectives and pollution control technologies of coking industry, the future reduction potential of SO2 emissions from coking is analyzed on the basis of coking technological progress, process improvement and industrial restructuring. It shows that the potential of SO2 emissions reduction will be 90.35 kt by 2010, and it will amount to 252.49 kt by 2015, which will be a good support to the energy-saving and emission-reduction targets of the country.
Set Pair-Wavelet Analysis on Water Resources Compensation Characteristics of Fu River Basin
Authors: Zhang Dai Qing , Mei Ya Dong , Yong Ting , Zhou Yan Lai
Published: January 2012

To solve the flood-drought coexistence issue by taking measures on water resources compensation (WRC), the set pair-wavelet analysis method (SPWAM) is proposed to study water resources compensation characteristics (WRCC); and Fu River Basin as a case, the uncertainty correlation and its periodic variation laws, which are implied in synchronous-asynchronous encounter probability of rich-poor rainfall and runoff, are researched; then the traditional methods are used to test the results; the conclusions obtained show that: in Fu River Basin, there is an uncertainty correlation of more synchronous(encounter) probability and little asynchronous(compensation) probability of rich-poor rainfall and runoff or runoff and runoff, and a variation law, which is of characteristics of multiple main cycles, is an alternate change of partial encounter and partial compensation in the correlation. These conclusions can provide better basis and condition to solve the flood-drought coexistence in the basin by adopting measures of WRC regulation and flood resources.
Improvement of Natural Ventilation of Post-Earthquake Transition Settlements in Dujiangyan, Sichuan
Authors: Huang Lu Hong , Long En Shen , Wang Zi Yun , Zhou Bo , Huang Lu Hong , Song Yu Ning
Published: January 2012

In the summer of 2010, we performed some on-site measurements to investigate the outdoor air temperature and wind velocity of Happy Homeland, a typical post-earthquake transition settlement of Sichuan. With the results of the measurements we found some problems in the existing planning and design of the settlements and proposed improvement which can make the transition settlements have larger volume fraction and better ventilation environment. The CFD simulation results show that the improvement can enhance the outdoor wind velocity by 19.4% and 16.7% respectively, and can raise the air changes per hour by 44.4% and 63.7% respectively, compared with the present condition.
A Study of the Protection-Oriented Development Strategy of Green Heart in Hilly Areas: The Case of Green Heart Demonstration Zone of Changsha-Zhuzhou-Xiangtan Agglomeration
Authors: Jiao Sheng , Gao Qing , Wei Chun Yu , Peng Shan Ni , Liu Su
Published: January 2012

This paper derived from the desire for a better understanding of the challengers faced by the green heart of Changsha-Zhuzhou-Xiangtan agglomeration, advancing the developing strategy of Green Heart from multiple aspects such as coordinated management of regional scale, the growing pattern of ecological layout, efficient composition and space optimization as well as “Green” industry operations. Based on regarding Yijiawan district as strategic core, Zhaoshan scenic resort as Green Lung, this visualization anticipates the spatial layout pattern of Green Heart in which the demonstration zone is surrounded by Muyun cluster, Tiaoma cluster and Longyunxian cluster in the form of circular sector. In comparing status quo with succeed domestic and foreign case, the conclusion “One heart with Eight Clusters” is drawn.
Research on Design of Green Residential Buildings
Authors: Chen Su Hong
Published: January 2012

As a main theme of the 21st century, sustainable development is turning a new page in the development of human civilization, which is justifiably resulting in the conception of “Green Building”. This paper defines green building and green housing, analyzes their profound significance and probes into approaches to realize such designs.
Urban Energy System Planning and Chinese Low-Carbon Eco-City Case Study
Authors: Liang Hao , Long Wei Ding , Keirstead J. , Samsatli N. , Shah Nilay
Published: January 2012

An integrated urban energy system planning model named SynCity which could make overall considerations of architecture site selection and layout, energy demand prediction, energy technologies optimal selection and energy flow distribution is shown in this paper and demonstrates it in the case of Shanghai Lingang New City. By case study simulation it offers a promising low-carbon emission solution which is the combination of gas engine heat pump and building cooling, heating and power. The energy flow between different cells of the city is obtained at the same time.
Hybrid Energy Storage for Wind Electric Power Systems
Authors: Lv Hai Rong , Wang Hai Feng , Gao Feng , Ma Jun Hua , Yin Wen Jun , Dong Jin , Wu Jing Chen
Published: January 2012

As the renewable energy (wind energy, solar energy) being utilized more and more, there is strong demand for improvement on the policies of energy storage management. Several papers have shown that hybrid storage system is more efficient and economic than single storage system. In this paper, a policy based on the accurate prediction of wind speed in the near future is introduced and compared with state-of-charge (SOC) management approach and single storage system. The current simulation results demonstrate that the new policy proposed has a minor improvement on the set-up cost and the system performance over the state-of-charge policy.
Edge Feature Extraction about Moth Digital Image in Agricultural Field
Authors: Gu Bo , Liu Xin Yu , Liu Qing Xia
Published: January 2012

First to introduce the image pre-processing method for digital image of moth in agricultural field, after, using Otsu method to segment the digital image of moth, there are some false target regions and false background regions should be eliminated from the segmented digital image. The edge feature can be extracted by computing the distance of edge pixels to the centroid point for individual moth image target region. The edge feature is different for different kind moth; a moth can be classified to a certain kind moth if the edge feature of the moth resembles a certain kind moth’s edge feature.
Aanlysis on Dynamic Change of Eco-Environmental Quality in Kailuan Mining Subsidence Area
Authors: Li Xing Li , Li Shu Zhi , Gao Jun Hai
Published: January 2012

In this paper, Remote Sensing images were selected as the data resource. An eco-environmental quality evaluation model which contained forest and grass cover index, wetland cover index, landscape index, biological abundance index, and poor degree of ecological was established, and was applied to the analysis on dynamic change of eco-environmental quality in kailuan mining subsidence area. The results showed that the eco-environment quality of Kailuan mining subsidence dropped first, latter rise unceasingly and the eco-environmental quality in 2009 was best. It is consistent with the actual situation.
WTO Accession Brings Opportunities, Challenges to CNOOC and Corresponding Countermeasures
Authors: Huang Xin , Lai Nan Jun
Published: January 2012

China join in WTO means that China petroleum industry will be integrated into economic globalization also means that China petroleum industry will have a direct impact by market competition. As being Chinese’s largest offshore oil and gas producer, China National Offshore Oil Corporation must take active measures to deal with the opportunities and challenges brought by joining the World Trade Organization.
Design Method for the Off-Road Vehicle’s Key Parts under Time-Dependent Uncertainty
Authors: Fu Xue Jie , Shi Bo Qiang
Published: January 2012

Aimed to the uncertain variables existing during a off-road vehicle’s lifetime, the mechanical structure’s time-dependent characteristic based on stochastic process was deduced. The time-dependent mechanical design model was presented, which provides a coherent framework for calculated time-dependent reliability. In this paper, the new mechanical design method was applied to design the drive axle depended on any time t’ reliability requirement. By using this method, the reliability of all time horizons can be gained to predict the trend of key parts’ reliability for all machines. This research can also provide a basis for maintenance of machine.
Analyze the Method of Generative Design in New Chinese Furniture
Authors: Zou Wei Hua
Published: January 2012

Compared with the method of common design, the generative design that considering more application of semantics is more suitable for the design of new Chinese furniture. Make a comprehensive survey upon the design example in new Chinese furniture, its generative design develops mainly towards two directions: One is towards the design about the characteristics of DNA, the design compromising the classic elements in Chinese furniture and modern life style, cultural consciousness, social perception; while the other is about the arrangement pattern of DNA, the design harmonizing the classical form in Chinese furniture and modern interior circumstance, living articles, delight of life.
The Comparative Research on City’s S&T Innovation Capacity of Jiangsu Province - Based on Principal Component Analysis and Cluster Analysis
Authors: Cai Yuan Cheng , Zhao Min
Published: January 2012

S&T capacity is the motivity of economic development, and it is urgent to promote it according to regional practical conditions. This paper aims to evaluate S&T capacity by establishing index system, and then local government can take steps to promote S&T level. It reviewed literatures of regional S&T innovation capacity briefly, and constructed city’s S&T innovation capacity evaluation index system of Jiangsu province. Then, it analyzed city’s S&T innovation capacity of Jiangsu province by Principal component analytical method and Cluster analytical method, and established an evaluation model. After calculating sum-scores and sorting the four factors of S&T innovation capacity, the results of the study showed the weakness of three regions in Jiangsu. At last, some suggestions are made to improve each city’s S&T innovation capacity. With the accelerated trend of economic globalization, the contribution rate of traditional production elements to economic growth decreases gradually and the resources constraint increases year by year. In the new international competition situation, S&T innovation has become the core driving force of the national and regional economic development. Since the reform and opening-up, as a major economic province, Jiangsu province maintained a stable and rapid growth in economic, but gaps between different regional economic are wide [1]. The overall level of S&T development depends on its various parts of the creative capacity, only those internal developments are balanced and of high S&T innovation capacity will effectively promote economic development. Based on the comparative research and clearing of each city’s gap and weakness in S&T innovation, we can put forward suggestions to promote each city’s and even Jiangsu province’s S&T development level, which has significant meaning of guidance.
Qualitative Analysis on the Cost Control and Construction Engineering Project Management
Authors: You Tao , Yao Zhuo Hong , Wang Wei
Published: January 2012

A qualitative analysis has been made on the slow development of the engineering project management and corresponding cost control method which has been the bottleneck of the rapid development in the engineering industry and construction production. The economic development of the market and the changing investigation subjects urgently need the reform and renewal to the current engineering project management and the cost control. The unification of engineering project management system in China to the international practice after reform not only adapts the requirements of national economic market development, but also creates conditions for the Chinese construction enterprises to participate in the international construction market successfully.
Investment Analysis of Network Reinforcements Mix for Distribution Systems with Distributed Generations
Authors: Su Chun Lien
Published: January 2012

New trends of environmental, regulation, and economical aspects cause an increasingly distributed generation (DG) connected to distribution networks. Existing distribution networks, however, are not designed to accept extensive DG. Many novel network reinforcement approaches have been proposed for solving the network connection issues. For economic viewpoints, it is important for determining cost-effective network reinforcement solutions for facilitating the meeting of DG growth goals while maintaining the network supply quality and operation security. This paper aims to address network reinforcements investment analysis for accommodating DG capacity growth. A methodology is proposed in this approach to quantify the impact of future increases in DG through the undertaking of a case study based on a generic distribution network model and different projected DG scenarios. Some available network reinforcement options used for managing fault level, voltage level, and power flows are presented and their costs required for meeting supply quality requirements of different types of customers are analyzed. Test results of applications of the proposed method to a practical distribution system are presented. Analysis results can assist distribution network operators in determining proper reinforcement options for managing distributed energy resources.
Study on Sedimentary Facies of Carboniferous Kalashayi Formation in the South of Tahe Oilfield
Authors: Liu Kang Ning , Jiang Zai Xing , Zhong Da Kang , Kang Rong , Cao Yue
Published: January 2012

Tahe Oilfield is an significant petroleum exploitation and development area in Tarim Basin for SINOPIC. Carboniferous Kalashayi Formation has become an important oil-bearing series for increasing and maintaining production, and for finding backup resource in this Oilfield. Based on the theories and methods of sedimentology, by using the sesmic, log and core data, the sedimentary facies of Carboniferous Kalashayi Formation in the south of Tahe Oilfield are analyzed deeply. Through the study of characteristics of the rock type and texture,sedimentary structure, sedimentary sequence, stratic structure, paleontology, geochemistry and geophysics of Kalashayi Formation, the Sand-shale Section is attributed to tidal flat deposits which has a nature of estuary. The study area are mainly dominated by intertidal zone, including mud flat, sand-mud flat, sand flat, tidal channel and mouth bar microfacies. The Up-mudstone Section developed lagoonal facies. This study provides favorable support for the further petroleum exploration in study area.
Optimization of Economic Indexes in Cangshang Gold Mine
Authors: Lu Lin Lin , Lv Wen Sheng , Yang Peng , Yu Gen Bo
Published: January 2012

Based on system modeling, including ore reserves model, mineral processing model and comprehensive technical economic analysis model, the major economic indexes of Cangshang Gold Mine were multi-objective optimized by fuzzy comprehensive evaluation. After optimization, the total profits, gold output and NPV were improved.
Experimental Research of Oolitic Hematite in Hebei Province
Authors: Nie Yi Miao , Niu Fu Sheng , Xia Mao Hui
Published: January 2012

Oolitic hematite is a kind of difficult procession mineral because of the finely dissemination particle and complex mineral composition. In this paper, ore quality, technology mineralogy and mineral processing technology were studied. Three different technology was tested. Results shows (1)with the fineness of 0.076mm 95%,iron concentrate grade reach 62.74% with a recovery of 46.80% by high intensity magnetic separation-reverse floatation flow sheet. (2)61.09% iron concentrate grade and 45% recovery could be got by four times intensity magnetic separation with four times grinding and four times gravity separation.(3) according to roasting 75-90min with temperature 800°C and ore-coal ratio of 11,iron concentrate grade is 62.74% and recovery is 87% by roasting-magnetic separation flow sheet. This experimental study provide a good basis for using oolitite hematite in Hebei province.
Study of CO2 Hydrate Growth Process Based on Diffusion-Controlled Reaction
Authors: Liu Ni , Li Ju , Liu Dao Ping
Published: January 2012

A one-dimensional mathematical model of mass transfer during CO2 gas hydrate film formation at the boundary between the gas and water is established by analyzing the process of the static system. According to the model, we can get the concentration distribution of free CO2 in the hydrate film along with the time, and the conversion rate of hydrate with time can also be obtained. The results calculated at specific experiment condition in the system are analyzed. It indicates that the conversion rate can reach about 85% after 10 hours under static condition with 3.5MPa pressure and 0.5°C temperature by pure water when the initial reaction liquid depth is 20 mm
Power Networks Coordinated Planning Based on Improved Steiner Minimum Spanning Tree Theory
Authors: Liu Han Lin , Jiang Jin Liang , Zhang Yong Jun
Published: January 2012

110kV substation’s location and supply area is the crux of the coordination planning for main and distribution network. In this paper, an approach to the coordinated planning of the main grid and distribution network is proposed, which is based on improved weighted Steiner minimum spanning tree theory. This paper will analysis the basic properties of substation firstly, make the definition of Load Weight Coefficient, then use a bound circle to delineate the optimization area. At last, make Load Weight Coefficient as weight, use improved weighted Steiner minimum spanning tree theory to determine the final location of substation. Actual examples show that, in favor of coordinated planning, this method result is obviously better than traditional model’s.
Minimum Air Gap between Drinking Water Outlet and Surface of Sewage
Authors: Zhang Yun Xia , Sun San Xiang , Zeng Li Yun
Published: January 2012

To prevent the contaminated water from flowing back into the potable water supply, Particle Image Velocimetry (PIV) was employed to measure the variation of flow field and study the relation between the minimum air gap h and the water outlet diameter d concretely. The theoretical analysis and the experimental results show that the h/d is not vary linearly as required in ‘Code for Design of Building Water Supply and Sewerage’ but exponentially.
Wind Power Generation Prediction by Particle Swarm Optimization Algorithm and RBF Neural Network
Authors: Liu Rui Fang
Published: January 2012

Wind power generation trend prediction is the important to make the plan on the development of wind power generation. Wind power generation prediction by particle swarm optimization algorithm and RBF neural network in the paper. As the connection weights between the hidden layer and output layer, the centers of radial basis function in hidden layer and the widths of radial basis function in hidden layer have a great influence on the prediction results of RBF neural network,particle swarm optimization which has a great global optimization ability is used to optimize the three parameters including the connection weights between the hidden layer and output layer, the centers of radial basis function in hidden layer and the widths of radial basis function in hidden layer. It is indicated that the hybrid model of particle swarm optimization algorithm and RBF neural network has better prediction ability than BP neural network.
Indoor TMD Secure System for early Detection of Alzheimer’s Disease
Authors: Elango Hemalatha , Nagarajan Karthiyayini
Published: January 2012

With more number of aged people being diagnosed for Alzheimer’s disease and prevention being the only remedy, the proposed idea helps in continuous monitoring through wireless technology. The Tracking, Monitoring and tele-Diagnosing (TMD) secure system utilises Bluetooth wireless technology. Here the movement pattern of the patient is tracked with the help of Bluetooth enabled handheld device carried by the patient and Bluetooth APs located in each room. This pattern is stored in the data base. To protect the privacy of the patient the collected information is secured through geo-encryption technique before sending via open wireless channel (internet). The remote medical practitioner is able to diagnose whether the target patient is developing Alzheimer’s disease from the received information. Thus, our proposed system provides secured remote diagnosis of the disease in senior people.
Approach to Diagnose Gear Tooth-Broken Fault Based on Web
Authors: Kang Wei , Chang Guang Jian , Qiao Xin Yong
Published: January 2012

Gear box is one of the most important parts of vehicle transmission. Its fault influences the mobility of vehicle. In all the gear faults tooth-broken have the most serious harm. In this paper fault simulation test was taken on armored vehicle, and the vibration signals of gear box were measured. A signal analysis and fault diagnosis system was developed based on wireless web to analyze the signals in time domain and frequency domain. In this way a type of remote diagnosis is realized to diagnosing gear fault.
Enhanced Distributed Coordination Function of MAC for VoIP Services Using IEEE802.11 Networks
Authors: Vignan B. Suvarna , Naick B. Lalu
Published: January 2012

Voice over Internet Protocol (VoIP) is an important service with strict Quality-of-Service (QoS) requirements with in wireless local area networks. The popular Distributed Coordination Function (DCF) of IEEE802.11 Medium Access Control (MAC) protocol adopts Multiplicative Increase and linear Decrease procedure to reduce the packet collision probability in WLANs. In DCF, the size of contention window is doubled upon a collision regardless of the network loads. This paper presents an enhanced DCF scheme to improve the QoS of VoIP in WLANs. This scheme applies a threshold of the collision rate to switch between two different functions for increasing the size of contention window based on the status of network loads. The performance of this scheme investigated and compared to the original DCF using the network simulator NS-2. Under the high traffic loads the packet loss probability decreases with the enhanced DCF compared to the original DCF. Some other parameters like throughput and access delay is decreased with the enhanced DCF.
Research on Approximate Calculation Method of Average Radar Detection Range of Searching Radar over Sea
Authors: Rao Shi Jun , Tian Shu Sen
Published: January 2012

Aiming at the fact that the distribution of evaporation duct height is easier to obtain than the original history atmospheric and hydrology data in some sensible areas, an approximate calculation method of average radar detection range of searching radar over sea from the distribution of evaporation duct height is advanced, then this method is tested. The testing result shows that the difference between this method and direct calculation is less than 20km, so this method can meet the requirement of average radar detection range and be well applied in the evaluation of radar detection ability of searching radar in sensitive areas.
Mathematical Modelling Analysis of Credit Risk in Home Loan
Authors: Ko Po Sheng , Wu Cheng Chung , Chang Chung Feng
Published: January 2012

Our country generally has voluntarily buys custom of the room, but house price actually non- each individual people all can bear its amount, therefore all relies on the mortgage loan which the financial organ provides. However the financial organ after the loaning out fund, will be able to face the loan person in also the funds behavior irregularity, will break a contract the situation influence to be biggest, further inquired into its influence factor has its necessity. Breaks a contract influence factor the situation to be possible to differentiate for the interest rate with the non- interest rate two aspects, tended to by the recent years market rate undulation relaxes the tendency to look, analysis the non- interest rate influence factor appeared is important. This research directly embarks from the loan characteristic, the analysis contains the loan amount, the loan interest rate, period of payments and so on three variables to break a contract influence the situation, and returns (Logistic Regression , LR) the model makes the real diagnosis analysis, the real diagnosis result also demonstrated the non- interest rate influence factor reveals the influence to the loan person irregular also funds behavior existence.
Improving on Human’s Movement Time Model for Pointing Task - Introducing the Target Position Factor into Fitts’ Law
Authors: Du Jun Min , Shi Hai Wen
Published: January 2012

The experiments were aimed at determining the effect of target position on movement time when performing a target pointing movement task. 21 subjects performed pointing movements with 72 conditions of various target position. The movement time data were collected. It was shown that the starting point position and target position greatly affect the movement time. As a result, the movement times were not explained satisfactorily by the conventional Fitts’ model. The conventional model was improved by introducing the target position factor into. Compared with the conventional Fitts’ model, the new model could describe the data better, both in term of contribution value (r2) and the standard error of the residual between the predicted value by model fit and the measured movement time.
A Virtual Model for Civil Building Electric Control Based on Matlab Controller
Authors: Liu Hong Wei
Published: January 2012

The purpose of this study is correct and effective model predictive control (MPC), in reduce energy demand and cost of buildings in power network and use pricing -- a demand and charges. A virtual model, for a single floor, the article commercial buildings equipped with variable air volume (VAV) based on Energyplus cooling system. Real-time data between the realization of the switch Energyplus and Matlab into building control virtual test bed (BCVTB) as a middleware. System identification technology is to realize get zone temperature and the power function model, which is used in the MPC framework. With economic target, target function is formulated as a linear programming problem and solves the problem. In the rush hour pre-cooling effect and independent cooling unloaded from building thermal mass in supply and demand can be observed during a consecutive weekly simulation. The MPC brings the cost comparison, the control strategy and other are preprogrammed baseline.
Studies on Divided-Period Reactive Power Optimization Based on Multi-Fractal Characteristic Parameter
Authors: Li Mei , Cheng Xin Gong , Zong Xi Ju
Published: January 2012

Divided-period method based on multi-fractal characteristic parameter was proposed to confine the switching times of control devices in the regional power system. Using the fractal theory, we can predict fluctuations of the load and calculate the multi-fractal characteristic parameter of different times. Considering the maximum allowable daily switching times of control devices, the demanded times are classified adaptively using hierarchical clustering method by clustering different times which had the similar multi-fractal characteristic parameter. This method not only reduces the switching times of control devices, but also improves the efficiency of compensation.
Researches on Reactive Compensation for Long-Distance and Highcapacity Hybrid Submarine Cable Lines
Authors: Sun Dong Mei , Wen Jun
Published: January 2012

In order to balance reactive power, reduce line losses, prevent excessive power frequency and switching over-voltage and adjust and control the line voltage etc. The long-distance and high voltage transmission lines are needed reactive power compensation. High voltage overhead transmission lines and high voltage submarine cable (including mixed-submarine) transmission lines are different, for example, the capacitance in the submarine cable lines is larger than in the conventional overhead lines. Therefore, the reactive power compensation on the EHV transmission lines which contains submarine cable lines is focus on the compensation of submarine cable lines. The reactive power compensation in 500 kV AC submarine cable interconnection project for Hainan power grid and Guangdong power grid[1], which is the first 500 kV long-distance and high-capacity sea trails interconnection project in China and which is just completed soon, is researched by Electro-Magnetic Transient Program——PSCAD/EMTDC (Power System Computer Aided Design/ Electro Magnetic Transient in DC System in this paper). The simulation results verifies that the role of shunt reactor which could absorb charging power and suppress the power frequency overvoltage for the long-distance and high-capacity hybrid submarine cable lines. The conclusions can offer references to suppress power frequency overvoltage and the reactive power compensation in extra high voltage transmission lines which is the mixed mode of overhead transmission lines and submarine cables.
Model and Algorithm of Online Risk Assessment on Urban Power System
Authors: Fang Zhu , Liu Hai Tao
Published: January 2012

This paper describes a practical method of Online Risk Assessment (ORA) on urban power system. It includes a set of models for online risk analysis of urban power system, the Online Probabilistic Risk Indices (OPRI) & their arithmetic, and the models for computing parameters varying with operating conditions which are used for Probabilistic Risk Indices calculation. The ability of the method can provide operators in control center the near term identification on security level, weak point, and riskiest event of urban power system. Further more, the system architecture of Online Risk Assessment (ORA) is presented, which is the preparation of software implementation of Online Risk Assessment System (ORAS) on Urban Power System
Spatially-Variant Morphology Operators in Boolean Lattice
Authors: Li Yan , Duan Shan
Published: January 2012

Base on the representation of the spatially-variant (SV) binary mathematical morphology operators, we develop a representation of the mathematical morphology on Boolean lattice through the automorphisms group and sup-generating family. Moreover, the spatially-variant (SV) Euclide mathematical morphology operators in the Boolean lattice case are unified.
Modeling the Distribution Grid by Petri Nets for Reconfiguration the Power System
Authors: Thi Huyen Chau Phan , Zamai Eric , Thi Ngoc Yen Pham
Published: January 2012

The focus of the present paper is on modeling the distribution grid using Petri Net for reconfiguration. Such system can be described as node and connection. So modeling this system is to model the node and connection in order to describe all the actions in the system then collect the data . Each connection in the power network will be transfer to Petri Net according to the designing of the fiche. Then the whole system can be modeled by Process Algebra Petri Net (PPN). It makes the grid more compact and easier to monitor
System Designation and Optimization in Real-Time Identification of Lane Boundary Based on DM642
Authors: Zhao Yu Qin , Zhang Run Shen , Li Yong Kun , Zang Jun Jie
Published: January 2012

The hardware and programming of lane boundary identification system, which based on the hardware platform of DM642, designed. The system complete the functions of acquiring image data, optimizing acquired data by ant algorithm, comparing value by the objective function, exporting image of lane boundary and so on. For the sake of improving the real time capability further, optimize code by way of methods, which include the optimization of compiler, intrinsic function, packaging data, using pipeline technique, and assembly code, giving specific optimization methods and real time capability of algorithm affected by each process. As a result the identification time of system reduced from 101.75 ms to 20.55ms, improved the system of real time capability effectively, laying a good foundation for industry.
The Variable-Frequency Speed Governing and Constant Pressure Water Supply System Based on PID Fuzzy Control Algorithm
Authors: Wang Rui Lan
Published: January 2012

The paper revolves around the design of large and medium-size water supply system in which the adjustable modifying factor PID fuzzy control algorithm is adopted. The design offers a solution which is targeted at the closed-loop control by analysis mathematical model is not efficiently achievable, because of the complicated water pipelines and numerous curves, as well as the fact that the objects to be controlled are characterized by their high order, big lagging, close coupling, non-linear and time-varying parameters. The design can enhance the stability and reliability of the frequency control water supply system.
Numerical Heat Transfer Analysis of Flake Ice Storage System with Nanofluids
Authors: Zhao Jing De , Liu Ni , Wang Yi
Published: January 2012

Ice Storage air-condition can be used to shift electrical load from on-peak hours to off-peak hours, which can bring mutual benefits to power supplier and consumers. An unsteady heat transfer numerical model is developed to predict the increment of thickness of ice layer of flake ice storage system with Cu-H2O nanofluids solidification. In this study, the speed of increment of ice layer of water and Cu-H2O nanofluids are compared.
On True Face of Magnetic Field
Authors: Jadhav G.H.
Published: January 2012

In the present work we reanalyzed the fields of magnetic materials on the instance of absence of magnetic monopoles. First we reanalyzed the field of a current carrying conductor which determines its true face as an electric field which is parallel to the wire having zero divergence and non-zero curl. The force exerted on a charged particle by this field has unique direction and does not depend on the direction of the motion of the particle. The non-zero curl of the field causes the force to be asymmetric in nature because of which a charged particle, placed in it, never moves along a straight path and follows a curved path. The study explores a basic difference between the real force and the supposed magnetic force in the fields of magnetic materials suggesting that there is no magnetic field which we have been considering. The real force in fields of all magnetic materials is electric and exerts in terms of field-field interaction. Experimental evidences for the same are reported. The interaction between poles of bar magnets, the induction of emf and Lenz’s law are explained on the basis of curled electric fields.