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Forecasting and evaluating the safety of mine main ventilator are helpful to prevent mine ventilation safety accidents from happening. First, on the basis of collecting and analyzing a large quantity of fault information of main ventilator in the nationwide coal mine, the index system was established for safety evaluation of coal mine ventilator. Second, the remark set was set up. Then, weights of safety estimation index of mine main ventilator was determined by using Analytic Hierarchy Process(AHP). With the experts grading method, single-factor matrix of fuzzy evaluation was established. Last, mathematical model of fuzzy comprehensive evaluation was settled for mine main ventilator based on fuzzy theory and used to evaluate the safety of the coal mine main ventilator. The current safety assessment level of coal mine ventilator is “basically safe” and the result can be used to make decisions.

The shielding against the UV radiation is one of the practical requirements for the textile industry. The in-situ synthesis process of ZnO nanorod arrays on silk fabric by the application of a hydrothermal method was described in this paper. Experimental parameters (concentration, temperature, time) were adjusted systematically to obtain the optimum. The results indicated that ZnO nanorod arrays grew well on silk fabric surface and enhanced UV-blocking property of the silk fabric.

Tip clearance of compressor rotor blade is introduced for avoiding friction collision between the moving blade and the casing. Because of the existence of the pressure difference between pressure surfaces and the suction surfaces of the blade, the blending of the leakage flow with the mainstream causes losses, which affects internal flow field and overall performance of the compressor. In this article, numerical analysis software is used to study the multi-condition performance of a six and a half axial flow compressor, for analyzing the impact of leakage flow patterns on compressor.

Deformation of engineering structures is often measured in order to ensure that the structure is exhibiting a safe behavior. The relationship between deformation and environmental factors is often studied through regression to pick out ambient factors which have major impact on the deformation of the engineering structure. One of the regression assumptions is independence of observations. However, when observations are closer to each other, there is spatial autocorrelation in the observations and the assumption does not hold. Thus it is necessary to test for spatial dependencies before regression. Through the study of a deformation data of a viaduct in Shanghai, China, we find that there exists significant spatial autocorrelation in horizontal and vertical directions, and the vertical deformations exhibit especially strong spatial association.

With the increasing development of railway transportation, the wheel-rail wearing problem is becoming more and more serious while the increasing of both the operating speed and loading weight of railway vehicles. Active radial bogie is one of the hotspots for research in the area of decreasing the wheel-rail wearing issues. Meanwhile, the energy dissipation problem has been restricting its development. This paper puts forward a novel energy-harvesting active radial bogie for rail vehicles. Making use of the hydraulic electromagnetic energy-regenerative shock absorber, the vertical vibration energy could be harvested while train is traveling. Detailed study and evaluation for this active radial bogie will be presented. The tests and simulation results prove the effectiveness of the proposed bogie mechanism and control.

With the advent of the era of economic globalization and Internet information and the emergence of this emerging industry, e-commerce for modern business provides a completely new business platform, which has played a tremendous economic significance in promoting the potential engine of global growth for small and medium-sized enterprise's survival and development. The paper analyzed the current developing model and innovation of electronic commerce in our country’s small and medium-sized enterprises.

Balancing energy load is a key problem in wireless sensor network (WSN) research. For balancing node energy consumption and prolong the network lifetime, this paper proposes an improved routing algorithm EBRA (Energy Balancing Routing Algorithm) based on energy heterogeneous WSN. To maximize the energy efficiency of network nodes, the EBRA weights the probability of cluster head election. According to the estimate value of the network average remaining energy and the residual energy of network nodes, we can calculate the new cluster head election threshold. The simulation results show that the utilization of energy balance of EBRA algorithm is improved 74%, 30% and 23%, compare with LEACH, SEP and DCHS, respectively.

In this paper, a kind of abundant and environment-friendly material—epoxidized soybean oil (ESO) was chosen to be esterified with acrylic acid to produce acrylated epoxidized soybean oil (AESO). By studying the influence of various factors including feed rate, reaction temperature, feed ratio, catalyst and inhibitor on the reaction, we got the optimal synthesis conditions: feed ratio is 1.25:1; reaction temperature is 120 °C; feeding time is about 2.5h;the dosage of the inhibitor (TBC) is 0.15 % and the catalyst (Triphenylphosphine oxide) is 1.5 %. The AESO we prepared has low viscosity, low skin irritation, excellent pigment wetting characteristics and so on. It can also be widely used in the manufacture of coating, printing ink, paint, etc.

The perfection of an ontology knowledge base is essential to the research of ontology-based information extraction (IE). Information extraction in short documents with sparse vocabularies in the ontology will cause the problem of semantic deviation. That will affect the indexes of information extraction in short documents. In this paper, we propose a method of using lexical chain to perfect the ontology knowledge base automatically in order to cover the shortage of manual constructed ontology. We can solve the problem of semantic information deficiency caused by the sparse vocabulary in the ontology effectively through the use of this method. We proved the validity of our method through the series of experiments we conducted.

In this study, a fuzzy credibility constrained programming (FCCP) model is developed for agricultural irrigation systems management under uncertainty. It is then applied to a real case study in a depression at southern Urumqi, China. The optimization model can be adjusted according to various considerations from decision makers, and thus much optimal and applicable management strategies can be expected through identifying the most appropriate credibility level for the system.

In recent years, the 3D display technology is not only a kind of show of technology, but also is integrated use implementation of relevant various technologies. 3D display technology itself has a lot of kinds of implementation way, which including 3D volumetric scanning, holographic imaging and integrated imaging; these 3D display technologies have their own characteristics. Combining with 3D display the related key technologies and development trend, this article analyzed the integration development prospects and the content of specific development of 3D display and the related technology.

This paper designs the virtual online platform of high precision machinery processing. And we use it to forecast the safety coefficient k and lift coefficient of auto machining process, and based on the safety coefficient and the lift coefficient we improve the automobile working procedure real-time, and obtain a reasonable body safety structure and external driving performance of the structure, which achieves good comprehensive design effect. At the end of this paper, we apply the system in the online virtual platform of computer higher occupation education. According to the cycle mechanism of the lift coefficient, we design the teaching task of cultivating innovative talents, and arrange the teaching tasks of applied science. It provides the theory reference for research on the higher occupation school personnel training.

In order to reduce production cost and simplify programming, the miniature programmable logic controller is designed, which realized restructure of the master control module based on STM32, and completed the control for external actuators through digital input and output module. Upper PC machine is used to monitor the running status of the controller with exchanging data through serial communication module.

To establish a simple method to separate and purify the magnesium lignosulfonate from the red liquor, the properties of the alkali precipitation of magnesium lignosulfonate in the red liquor were investigated. The results show that the magnesium lignosulfonate could be precipitated by alkali from red liquor. The maximum amount of precipitation occurs when pH value was 13. The precipitation of the red liquor of acid magnesium sulfite is caused by magnesium. It was different from sodium lignosulfonate of the red liquor of acid sodium sulfite. The repeated alkaline precipitation after acid soluble method could be isolated and purified lignosulfonate magnesium effectively at some extent.

In algorithms of obstacle avoidance for autonomous mobile robot, APF algorithm is simple, real-time and smooth, but has some limitations for solving problems. For example, the local minimum point may trap mobile robots before reaching its goal. Even though many improved APF algorithms have been put forward, few articles describe the process in detail to show how these algorithms are applied. Considering above factors, this paper focuses on embodiment of abstract improved theory for APF algorithm by showing some changes with formulas and parameters. The whole work has been done in simulation environment. According to the results this paper draws a conclusion.

For the lack of computing, storage, information integration and other aspects in traditional electric power computing platform, it is necessary to introduce cloud computing to it and to build a cloud computing platform based on open source Hadoop to meet the requirements of smart grid. As the single point of failure of Hadoop cannot guarantee the high availability that electric power system requires, this paper gives a solution that based on hot standby mechanism and automatically failover controlled by Zookeeper, analyses availability and disaster recovery times to ensure the electric power system provides fast and accurate service.

Age classification based on facial images is attracting wide attention with its broad application to human-computer interaction (HCI). Since human senescence is a tremendously complex process, age classification is still a highly challenging issue. In our study, Local Directional Pattern (LDP) and Gabor wavelet transform were used to extract global and local facial features, respectively, that were fused based on information fusion theory. The Principal Component Analysis (PCA) method was used for dimensionality reduction of the fused features, to obtain a lower-dimensional age characteristic vector. A Support Vector Machine (SVM) multi-class classifier with Error Correcting Output Codes (ECOC) was proposed in the paper. This was aimed at multi-class classification problems, such as age classification. Experiments on a public FG-NET age database proved the efficiency of our method.

Twelve vinegars from different production areas in China were evaluated by the Portable Electronic Nose 3 (PEN3), and the data detected by PEN3 were analyzed by principal component analysis (PCA), linear discriminant analysis (LDA) and loadings analysis (LA). The results of PCA and LDA all showed that the electronic nose could clearly discriminate the vinegars of difference production areas, but had very little discrimination on same production area vinegars. The results of LD showed that these sensors, including W1S, W2S, W5S, W2W, W1W, W5C, were appropriate to evaluate and compare the aroma of vinegars, especially W1S, W2S, W5S. Loadings analysis also indicated that these compounds in twelve vinegars had great differences, such as acids, esters, alcohols, alkanes, while aromatics compounds, sulfur-containing compounds and alkenes had some distinctions.

In digital printing process, the color reproduction quality is no longer determined by printing sequence, trapping, solid density and etc., since the technique is different from traditional printing technology. In order to analyze the effects of paper on color reproduction quality in digital ink-jet printing, three kinds of commercial paper were selected and a set of experiments were carried out by using color management technique to simulate the digital proofing. The density and chromaticity of both primary color and composite color in each printed were measured. The effects of paper’s characters on shadow, mid-tone and highlight were analyzed and discussed. Finally the influence on color reproduction quality principle, including chromaticity and absorbing characteristics of paper, was revealed. The conclusion has certain significance in directive function in ink-jet printing.

The paper focuses on the resistance characteristic of a novel M-beam separator. Adopting the combination of experiment study and numerical simulation, we achieve that 2D simulation has the similar results as 3D in predicting resistance characteristic which provides the theoretical basis for next research. An M-beam separator model ten times larger than original one based on similitude principle was made for sake of flow field visualization research. The paper analyses flow field distribution of the amplifying M-beam separator by silk thread display technology and the experiment results are well consistent with 2D numerical simulation. The flow field distribution described here could serve as a reference for developing M-beam separator.

This paper introduced a new mechanical construction for the vibration platform and its working principle. Based on virtual instrument, this paper used sensor, charge amplifier, DAQ(data acquisition card), computer, driver program and LabVIEW software to design signal measuring and analysis system of mechanical vibration platform. This paper used ADAMS simulate vibration platform motion and used LabVIEW calculate distortion degree of acceleration, velocity and position of the vibration platform.

A non-equilibrium atmospheric pressure plasma was applied for the polymerization of the methacrylic monomers such as (2-hydroxyethyl methacrylate (HEMA), methacrylic acid (MAA) and butyl methacrylate (BMA)). These monomers were successfully polymerized with retaining the functional groups of ester or acid. The polymerization mechanism was discussed on the basis of the optical emission spectroscopy (OES) of the plasma. It was strongly suggested that the functional groups could be retained in the polymerization proceeds when the HOMO-LUMO gap of the monomer is close to the energy of Ar metastable atom, which initiates the polymerization.

The cased hole resistivity logging technology is one of high-tech logging technologies being studied in China. The signal source requires high voltage, high current, ultra-low frequency, high stability, high resolution, etc. Based on the characteristics, proposed were the ideas that the direct digital synthesis technique should be applied to produce the required sine logging exciting signals, and high-power FET were used to produce the signals with high power and high voltage. The results show that the output frequency of signal source is 0~ 10 Hz, frequency resolution 0. 002 Hz, output voltage range -300 V~+300V, output current less than 6 A. The design has been successfully applied in the research project of extremely weak nV-level electric signal acquisition theory and experimental study on formation resistivity measurement through metal casing.

In order to solve the problem in reactive power compensation of oilfield distribution systems at present, a Taboo search algorithm is proposed in this paper, by which the optimal location and size of shunt capacitors on distribution systems are determined. Then the voltage profile is improved and the active power loss is reduced. In this paper, Voltage qualified is used as objective function to search an initial solution that meets the voltage constraints so that it is feasible in practicable voltage range; then the global optimum solution can be got when taking the reduced maximum of active power loss as objective unction. The examples show that the improved algorithm is feasible and effective.

Baiyangdian wetland is the end of defence line to middlestream and downstream of Daqing river, and its geographic position has decided its critical function to flood control of Daqing river watershed. Therefore, according to the flood regulating ability of Baiyangdian, when the basin occur 50 year frequency flood, joint operation programs have been determined firstly, then the joint operation of Baiyangdian and multi-reservoir in parallel upstream have been presented through the pre-discharge regulation and real-time control discharge regulation, through comparison we determined the optimal combination scheme: joint scheduling with Wangkuai, Xidayang and Longmen upstream reservoirs,the storing water of reservoir can appropriately increased by reservoirs flood control capacity, thus we can not diversion flood to Wenanwa by Xiaoguan floodway, it can reduce the flood diversion of 1.62×109 m3; and compared with conventional scheduling, we can reduce 8.57×108 m3 flood diversion to the East wetland through Zaolinzhuang discharge gate. Therefore the flood flow into the flood diversion area reduced significantly, which have great practical significance to the safety of Baiyangdian wetlands surrounding areas and the important cities and towns downstream.

Aim at introducing the hardware equipment of the steam dewaxing casting, automation control principle and wax model shell recycling. Realized the automation steam dewaxing based on S7-200PLC, upper PC machine monitors the whole process of dewaxing with exchanging data through HMI, and put forward the best time and pressure to aerate.

Based on the understanding of the connotation of water security, firstly the connotation of rural water security is analyzed, and then the relationship between rural water security and new rural construction is discussed. Taking Hebei Province as an example, the main existing problems of rural water security in Hebei province is analyzed from the aspects of rural drinking water security, rural areas irrigation water security, rural drainage water security, finally puts forward some countermeasures for solving the problem of rural water security.

Flood control dispatching of reservoir belongs to the ex-ante decision. This paper established the flood pre-discharge dispatching multi-objective risk index system and fuzzy optimization model method, taking Long Men reservoir as an example, to study the design flood pre-discharge scheme for different frequency, different frequency analysis of design flood pre-discharge flow and pre-discharge time, provide the reservoir flood pre-discharge scheme of different frequency flood and provide reliable basis for reservoir flood control pre-discharge dispatching.

To acquire a fast method for better volume estimation, a novel soft sensor technique is proposed in this paper. Based on the principle of energy conservation as well as the ideal gas law, mathematical models of charging and discharging process are set up. Afterwards, simulations are carried out to explore the relationship between the estimated volume and the pressure stable time. Finally, experiments with different pneumatic cylinders are conducted to select the suitable estimation mode and also optimize the parameters. Results show that in discharging mode, the average estimation error for volume estimation can be less than 4% with both low pressure and high pressure, making this method quite suitable for industrial application.

The paper give the method of microwave catalytic oxidation process to treat UDMH waste water. The effects of microwave power, irradiation time, H2O2 dosage and activated carbon dosage on the degradation rate of UDMH were examined. Under the conditions of microwave power 490W, irradiation time 9min, H2O2 dosage 1mL and activated carbon dosage 1g per 100ml UDMH sewage, the degradation rate of UDMH is over 97%. The method is effective by experiments, which will be the new way to treat the UDMH waste water.

Based on the study of ergonomics, this paper summarizes morphological characteristics of computer numerical control machine tool modeling, and according to the work functions and operation characteristics, it gives an analysis of the principles and requirements of computer numerical control machine tool modeling design and ergonomics, which will help broaden our thoughts in designing more vivid, lively and rapid new computer numerical control machine tool modeling.

The multi condition driving cycle mode of light truck is established. A comprehensive evaluation system for the vehicle powertrain(VP) optimal matching with integration of dynamic performance, fuel economy and exhaust emission behavior by means of the weighting factors is established. The methods to determine the parameters and weighting factors are established. A simulation model is set for the VP using the software Advisor, and a VP optimization program is compiled by the Matlab optimization toolbox. The model is validated by experiment and used to optimize the power train of a certain type of light truck. The results show that the consideration of the dynamic performance, the fuel economy in the VP matching reduces the exhaust emissions effectively.

In accordance with the characteristic of radial running an algorithm for distribution network reconfiguration based on Hopfield neural network is put forward. The in-degree of each node is determined by Hopfield neural network, it is determined whether the lines run according to the in-degree of the nodes, and the state of each loop switch is determined according to whether the lines run, and thus the distribution network reconfiguration scheme is determined finally. The energy function of the neural network and its solution method are presented. In the energy function are considered the radial running of distribution network, the lowest distribution network loss and no loop switch in some lines. The IEEE distribution network structure with three power sources obtained by the algorithm is basically consistent to that obtained by genetic algorithm, but the time spent using the former is shorter than that the latter.

Line quality micro-measurement is of important content of objective measurement, contributing to reproduction quality assessment of digital printed character and line metrics. Transforming physical presswork to digital image is not only the first but also a key procedure in micro quality measurement. In this study, effect of input resolution was verified in order to determine the precision requirement in micro quality survey. A series of experiments were carried out to measure same inkjet samples, which were scanned with a normal flatbed in three resolution sets. The effect on assessment accuracy of resolution condition was analyzed by pair-wise comparison method. Results show that normal flatbed is precise enough for micro line quality measurement. But 600DPI identified in ISO13660 standard is too low to serve in this survey. 1200DPI can work well enough and extra-high resolution version will not respond to improve the measurement precision obviously in inkjet line attribute evaluation.

The paper states the components of transfer roll coater for lithium-ion electrodes and the working principles of it.The high-precision coater with a unwinding unit, a coating unit, a drying unit, a leading unit and a rewinding unit has been developed. The methods which are focused on the manufacture precision, installation precision and control precision of the coating head to achieve higher coating accuracy were explored.

In this study we present a new framework to assess line micro quality of multicolor prints adapted to a low-cost image quality analysis system based on common flatbed scanner. The contribution elements including quality metrics, measurement principle, applying methods and detection instrument, which were complemented and sorted in terms of ISO 13660 standard, were described and a case experiment was conducted to survey the output performance of both inkjet printer and xerographic printer, two most popular digital printing technologies. Their qualities were compared in details rendering angle such as width and straightness of line, raggedness and blurriness in line edges, as well as darkness and contrast in color. The results verify the efficiency and shortcomings of the framework. Meanwhile, the metric values let us take an investigation in the character of each digital printing technology in micron size.

An optimizing design idea is produced for the structure of top beam of electrostatic precipitator casing. The thermos cabinet and the original box shaped top beam of casing compose a truss beam system whose overall section height is increased greatly, resultantly, the bend bearing capacity of truss beam increases significantly than that of the original top beam of casing. Consequently, the wall thickness of box section of the original top beam can be reduced so that the steel consumption can be saved. Based on a practical project, the load effects on truss beam were investigated, respectively, including the air pressure difference and the temperature difference among external layer, thermos cabinet and interior of casing. Besides, the evaluation method of internal force in truss beam was investigated and the selective preference of truss beam configuration was conducted. The unfavorable load cases of air pressure difference and temperature difference are proposed for truss beam design. Besides, the accurate evaluation method of internal force and the design method for economical configuration of truss are proposed. In consideration of load bearing effect of thermos cabinet layer, the optimized design of truss beam originating from box sectioned top beam can ensure the truss works safely and reduce the steel consumption significantly.

Gray balance is the basic and critical control parameters of color reproduction, which plays important rule as lever in color reproduction which balance the correlation of material characters and process control parameters. This paper focused on investigation about gray balance data variation caused by slight chromaticity deviation of printing material. In the experiment the creation procedure of gray balance curve was simulated by EPSON Stylus Pro7880c ink-jet printer, and delivered curves were compared with each other. Accordingly the tone value variation of primary color was analyzed in terms of chromaticity deviation of paper. Meanwhile the variation tendency of gray balance impacted by ink and paper property was qualitatively discussed according to data comparison with G7 method. Results show that tone value of Y is so sensitive to paper chromaticity deviation that even the dominant relation between Y and M tone will be altered. At the same time, the more the ink and paper property coincide with ISO standard, the more curve of gray balance curve coincide with theoretically ideal value.

In this study the effect on quality measurement introduced by input precision of instrument in image digitizing process was verified through a series experiment. Two categories of samples, which were outputted by EPSON Stylus Pro7880c digital inkjet printer and Xerox DocuColor5000 digital xerographic printer individually, were transformed into digital image with a normal flatbed scanner in 600 DPI, 1200 DPI and 1600DPI resolution. The area quality attributes such as graininess, mottle, NPS and banding were surveyed and analyzed with the aid of PIAS™-II personal image analysis software to investigate the stability of normal instrument used in digital prints measurement system. Results show that precision demands are different for various quality parameters and different application backgrounds, namely it is precise enough for common industry detection which has lager tolerance, but higher resolution does good to more effective and more precise measurement especially in R&D.

Digital elevation model, the core data for 3-dimensinal visualization and spatial analysis, plays a key role in geosciences and GIS, and wavelet transform is an important tool for data compression. According to the characteristics of DEM data and wavelet transform, we proposed an approach to diminish boundary distortion in compressing grid DEM data with discrete wavelet transform, so that the compression performances are evidently improved. The experimental results indicate that not only higher compression ratios but also reconstructed DEM data with high accuracy are achieved by using the proposed approach.

In the coal mine of Huaibei Mining Area, based on the character of thick dirt band in the coal seams and the influences to top coal caving, the physical and mechanical properties of dirt band were analyzed. In order to improve the recovery rate of top coal, the failure mechanism of dirt band was analyzed through the cantilever beam model, and the sensitivity analysis to the length of dirt band overhang was done in the conditions of different mining height and dirt band thickness. The results show that, the average water absorption of dirt band samples is 3.5%, and the soften coefficient is 0.71, which presents that the dirt band have large softening property and poor engineering geological property. When the thickness of dirt band was more than 3.5 m, the top coal could not be caved smoothly. However, the bigger underground pressure would be helpful to the broken of dirt band and top coal seams, and the recovery rate of top coal was improved.

Two evaluation models AHP / Fuzzy AHP were discussed and used for integrated assessment of highway landscape evaluation scheme, by initial AHP calculation of the weight of highway landscape evaluation factors, followed by the judgment matrix fuzzy calculation and evaluation. The results indicated that the more objective and scientific evaluation can provide a new method to evaluate highway landscape.

Two kinds of chitosan derivatives are made by adopting Schiff alkaline method and amino protonation method to modify the amino in chitosan. Deprotection to amino is conducted under the condition of both acidity and alkalinity. It turns out that these two kinds of methods can both be protective to amino in chitosan. And deprotection contributes to more convenience. Impurities brought by chitosan modified products made out of Schiff alkalinity method are lot. By means of deprotection, output of products is higher. Compared with Schiff Alkalinity method, the impurities brought by modified products made out of amino protonation method are lesser with a comparatively low productivity.

E-Yuan multimedia system is developed for the rich audio and video resource on the Internet and on its server side, it can automatically search and integration of network video and audio resources, and send to the client side for the user in real-time broadcast TV viewing, full use of remote control operation, Simply it’s a very easy to use multimedia system. This article introduces its infrastructure, main technical ideas and you can also see some details about server side and client side.

Well-aligned TiO2 nanotube arrays were fabricated from anodization by a subsequent heat treatment. Rate performance and electrochemical properties of TiO2 nanotube arrays were studied intensively. The electrode exhibits excellent rate capabilities at various rates with an average coulombic efficiency reaching 95.6%. It is obvious that TiO2 nanotube array possesses high rate capability and excellent cycling stability.

With the development and application of all kinds of newest technologies, current weapon equipments are generally complicated integrative systems with mechanical, electrical and liquid su-systems. This makes maintenance training manner and methods be serious problem. So, half-practicality maintenance training system based on bus-mastering will be developed. Complete scheme and overall arrangement were designed based on research about functions of the maintenance training system. It deeply analyzed the need of hardware sub-system and software sub-system of the maintenance training system, on the basis of which one actual equipment system was reconstructed and hardware and software were designed. Reconstruction is mainly used to set faults. It provides guidance to developing half-practicality maintenance training system based on bus-mastering.

Living load nonlinearity of self-anchored cable-stayed suspension bridges is studied in this paper. A self-anchored cable-stayed suspension bridge with a main span of 800m is analyzed with linear theory, second-order theory and nonlinear theory respectively. The moments and displacements of both the girder and the pylon under live load are acquired. Based on the results it is derived that the second-order theory can be adopted to analyze a self-anchored cable-stayed suspension bridge with a main span of 800m and the error is less than 6%.

There are three modes of reactive compensation. Analysis on the present situation of oilfield distribution, the on-spot mode is adopted in this paper. An approach for 10kV lines reactive power compensators of oil field distribution networks is put forward. At the same time, combined with the concentrated compensation and grouping compensation, the total number of capacitors and the investment are calculated. The feasibility of the proposed method is showed by the results of an example. the power factor is improved, the quality and reliability are also mended.