bluuebunny/crossref_metadata_2025 huggingface dataset:
Clustering analysis on inbound tourism market in Shandong province
Authors: Yu Tong
Published: July 2019

According to the relevant data of inbound tourism in Shandong province from 2008 to 2017, the development situation and source composition of inbound tourism in Shandong province were analyzed with the help of Excel software, and the source market and destination market of inbound tourism in Shandong province were analyzed by using SPSS23.0 software. The results show that the inbound tourism in Shandong province has a good momentum of development and plays a positive role in promoting the development of tourism in Shandong province. According to cluster analysis, the source market of inbound tourism in Shandong province is divided into three categories: Korea is the first category, Japan is the second category, and other countries are the third category. Inbound tourism destination market of Shandong province can be divided into four types, Qingdao is the first major categories, Yantai and Weihai as the second major categories, Zibo, Linyi, Jinan, Weifang, Jining, Taian and seven cities such as sunlight as the third category, Dongying, Liaocheng, Binzhou, Zaozhuang, Dezhou, Laiwu and Heze seven cities as the fourth categories, should increase the strength of the tourism resource development and promotion.
Study on Performance Evaluation Index System of Rural Water Environment Management
Authors: Huihua Xu , Li Wan , Song Xue
Published: July 2019

Rural water pollution control has become an important part of China’s water environment management. By analyzing the influencing factors of rural water environment management performance, establishing the evaluation index system, applying the structural equation model, this paper makes a comprehensive evaluation of rural water environment management through second-order confirmatory factor analysis, model path diagram drawing and data calculation. According to the effect of the strength of the factors to make effective control, the rural water environment management system will be improved.
Effects of Justice Perceptions on Private Sector’s Cooperative Behavior in PPP Project
Authors: Alu Shabu , Xiao Han
Published: July 2019

By integrating justice theory and relational governance, this study aims to extend the existing research on PPP projects by finding the effects of distributive, procedural and interactional justice on cooperative behavior from the private sectors’ perspective. Through a thorough literature review, a concept model including justice perceptions and cooperative behavior is developed. With the help of 163 valid data samples from an online structured questionnaire survey, SEM is used to examine the model proposed. The study finds: (1) when interactional justice is higher, the private sector will perceive higher distributive justice and procedural justice and these two dimensions of justice perceptions act a mediating role in interactional justice and cooperative behavior; (2) distributive, procedural and interactional justice are actively related to the cooperative behavior, and the total impact of procedural justice is the greatest, and the smallest is interactional justice. This study enriches the theory of relationship governance and makes new contributions to the governance of PPP projects. And PPP project management practices can be given.
Thermodynamic Analysis of a Novel Compressed Supercritical Carbon Dioxide Energy Storage System
Authors: Huang Jun , Liu Hui
Published: July 2019

To improve the thermodynamic efficiency of compressed air energy storage system, a novel compressed gas energy storage system using supercritical carbon dioxide was proposed. Energy and exergy analyses were used to study the thermodynamic performance of the novel energy storage system. The thermodynamic analysis results show that the energy storage system based on supercritical CO2 has a better performance and simpler system configurations compared with CAES (Compressed Air Energy Storage, CAES). The exergy efficiency and round trip efficiency of compressed supercritical CO2 energy storage system are 57.02% and 73.02%, respectively. And the highest exergy destruction occurs in the recuperator, accounting 36.51% of the total system exergy destruction, followed by the heater (32.33%) and then turbine, low-pressure reservoir etc.
Remote Sensing Study on Improving Rice Yield by Cotton-Rice Rotation
Authors: Sun Ling , Zhu Zesheng
Published: July 2019

From 2001 to 2002, an observation experiment based on satellite remote sensing was conducted in Xinghua City to study the difference between continuous rice monoculture and cotton-rice rotation rice in the rice ratio vegetation indexes or rice yields. This paper introduces the analysis method of rice yield difference developed for this experiment, and demonstrates it with the rice vegetation index. The results show that the average rice vegetation index or yield of cotton-rice and rice-rice modes is different. We have found enough experiment data to come to conclusion that rice yield under cotton-rice mode is higher than that under continuous rice monoculture.
Changes of Cd sources in Jiaozhou Bay 1984-1988
Authors: Yang Dongfang , Wang Fengyou , Zhu Sixi , Wang Ming , Yang Xiuqin
Published: July 2019

By investigating the dataset Cadmium (Cd) in Jiaozhou Bay from 1984 to 1988, In the paper showed horizontal distributions of Cd, the major sources, and the changes of the major sources. Results unveiled that the major Cd sources during this time period were marine current, river discharge and atmosphere deposition, whose source strengths were 0.12-6.48 μg L−1, 0.12-1.07 μg L−1 and 0.04 μg L−1, respectively. During this time period, the source input from marine was sometimes weak and sometimes strong. The source input from river discharge was changing from little input to relative weak, and then to relative strong. The source input from atmosphere deposition was changing from little input to occurring finally. The human activities resulted in the increasing of the source input of Cd to the bay, and influenced the water quality continuously.
Migration paths and laws of Pb from source to ocean
Authors: Yang Dongfang , Yang Xue , Wang Xiaodan , Huang Chengling , Zhu Sixi
Published: July 2019

The investigation dataset on Plumbum (Pb) in surface waters in Jiaozhou Bay in May and August 1990 studied the migration paths of Pb from source to ocean. The results unveiled that the major sources were port wharf, river flow, atmosphere deposition and marine current, whose source strengths were 13.39 μg L−1, 12.97 μg L−1, 11.01 μg L−1 and 10.82 μg L−1, respectively. This paper revealed that there were three different migration paths which were described by a block diagram model. Finally, the migration laws of Pb from sources to ocean were defined that the loss of Pb contents were increasing along with the increasing of migration path. Ocean was the sink of Pb. During the migration path from source to sink, a part of Pb was storing in water body, while another part was settling and fixing in sea bottom.
The Significance of Emission Trading System from the Perspective of Environmental Regulation— Based on the Analysis of China’s Environmental Pollution Control Data
Authors: Wang Yingdong , Zheng Yueming
Published: July 2019

Since the reform and opening up 40 years ago, China’s economy has been growing rapidly, but the continuous GDP growth occurs at the expense of natural environment. Based on the analysis of China’s environmental pollution situation and investment in pollution control since the 21st century, it can be found that there are some problems, such as serious air pollution and water pollution, deepening environmental damage, increasing economic losses caused by environmental pollution and insufficient investment in industrial pollution control. Emissions trading system, as an efficient system of pollution control, compared with the traditional pollution charge system, can effectively solve the problem of China’s air pollution and water pollution. Air pollution and water pollution to realize control of total pollution so that it is likely to achieve industrial upgrading,optimize allocation of environmental resources and reduce the cost of pollution control. It is more conducive to achieving the coordination between environmental protection and economic development.
Biodegradation of diethyl phthalate by Pseudomonas sp. BZD-33 isolated from active sludge
Authors: Ke Zhang , Xiangling Wu , Jian Chen , Jia Chen
Published: July 2019

Diethyl phthalate (DEP) is a common pollutant, which is widely used in industry. A strain of DEHP-degrading bacteria was isolated from activated sludge.According to the phylogeny of 16S rDNA sequence, BDZ-33 strain was identified as pseudomonas sp. Biodegradation of DEP by Pseudomonas sp. BZD-33 was investigated. The results show that the BZD - 33 degradation DEP optimal pH and temperature of 8.0 and 15 °C respectively. The degradation concentration ranged from 100-400 mg·L−1. The degradation efficiency and growth rate of the strain were higher under alkaline conditions than under acidic conditions. The best temperature below 20 °C. The degradation rate decreases with the increase of temperature. After 60 h of culture, the degradation rate of DEP wastewater with a concentration of 400 mg/L reached 90%. The results showed that BDZ-33 could efficiently degrade DEP, which might be a promising DEP repair pathway.
Study on the Combined Transport of Container Ports in Shandong Province
Authors: Meng Xiangru
Published: July 2019

In the new type of multimodal transport, especially in Shandong province, which has developed railways, there must be railways to participate in container port group transport and improve multimodal transport.Considering the economic and industrial layout of the hinterland of shandong province, the transportation structure is adjusted scientifically and the distribution of transportation resources is optimized.Firstly, container demand between hinterland and port is analyzed. Then the capacity of the combined transportation of iron and iron is analyzed. Finally, the improvement measures of container ports in Shandong province are put forward.
Surface plasmon resonance sensor based on Bi-monomer System (BMS) molecularly imprinted polymer for detection of 17β-estradiol in aqueous media
Authors: Jiao S Q , Chen X L , Yu J Y , Nawaz T , Wei T X
Published: July 2019

In this work, a hydrophilic and high sensitivity sensor was fabricated based on BMS (MAA : HEMA = 3 : 1, molar ratio) molecularly imprinted polymers (MIPs) film for 17β-estradiol (E2) detection in aqueous media combined with surface plasmon resonance (SPR) technique. In-situ UV polymerization method was used to synthesize the MIPs film on the gold surface which was modified with dodecyl mercaptan. Afterwards, the MIPs film was characterized by infrared spectroscopy (IR), scanning electron microscope (SEM) and contact angle measurements. The results showed that the MIPs film was successfully prepared on the surface of the sensor chip with good hydrophilicity and permeability. The analysis of SPR spectroscopy indicated that the MIPs film displayed greater selectivity to E2 than other competitors and non-imprinted polymers (NIPs) film and showed better adsorption performance than one kind of monomer for the same E2 concentration. The response of E2 sensor ranged from 2.5×10−16 to 2.5×10−8 mol/L with an ultra-low detection limit of 9.14×10−18mol/L in PBS buffer (pH 7.4). In addition, this sensor performed good reusability and stability. Finally, the sensor was successfully applied to detect E2 in tap water and human urine and had wide detection ranges and low detection limits in backgrounds.
Model Test of Soil Squeezing effect of Jacked Pile Sinking in Sand Slope
Authors: Hongli Ding
Published: July 2019

Jacked pile sinking has many advantages in terms of construction, which is one of the commonly used piling methods. However, the jacked pile sinking has significant squeezing effect against the side slope, resulting in the stability of the slope being affected to a certain extent. This paper attempts to determine by model test the squeezing effect of jacked pile sinking in slope.
A Marine Reverse Osmosis Desalination System with Energy Recycling Devices
Authors: Li Xiaoxia , Ji Yunguang , Zhao Yucheng , Liu Lu , Xue Shuqi
Published: July 2019

A new type of marine reverse osmosis seawater desalination technology is developed in order to solve problems of high energy consumption, large volume and high noise, etc. in traditional one. The new process uses a medium pressure feed pump and a three-in-one circulating pump in series. The three-in-one pump serves as the high-pressure circulating pump, energy recycling device and booster pump. The pump can effectively recover the pressure energy in the process of reverse osmosis, so that the system energy consumption greatly reduced; the small configuration and integrated design of the device can adapt to the narrow space of the ship; the reciprocating frequency of the simplified system is low which means lower noise of the new system than the traditional one. The system can fully meet the requirements of miniaturization and energy saving of marine seawater desalination equipment.
Application of Optical Measurement Technology in Welding Simulation of Box Complex Structure
Authors: Zhang Guizhi , Fang Yuanbin , Dong Shuanlao
Published: July 2019

To verify the correctness of the sample quality and the finite element model, optical measurement technology is applied in this study. Unable to consider the quality of tack welding during the established modeling, a three-dimensional scanner is used to detect box complex structures after welding. The finite element model of box structure is established for the study of welding deformation of box structure with short, multi space and multi staggered distributed weld seam. The accuracy of the model is verified by global detection of the structural parts. The results show that the deformation trend warps at the boundary of the left and right plate and concaves in the center of the plate. The maximum deformation of the vertical plate center is 1.714mm. The bottom pad produces the extruding tendency, and the deformation near two sides of the plate is about 0.51mm, which is greater than that of 0.34mm away from the two sides of the plate. The deformation is not consistent in the front and back sides of the Z plate. The maximum error of the sample parts takes place in the front Z shape plate with an error of - 0.03mm~0.12mm. There is a certain size difference under the influence of the welding gap, but it still meets the requirements of the engineering application to eliminate the influence of the welding quality on the deformation measurement. By comparing the results of the simulation and the global measurement of the structural parts, the difference between the vibration seat and the front Z plate has a large difference that is 0.12mm∼0.24mm, and the deviation satisfies the requirements of the engineering application, and it can effectively guide the production.
A novel UV pumped white-emitting phosphor La3SbO7:Dy3+ for white light-emitting diodes
Authors: Liu Simei , Deng Bin , Chen Jun , Liu Hui , Zhou Chong-song , Yu Ruijin
Published: July 2019

The dysprosium activating La3SbO7 white-emitting phosphors were prepared via solid-state route at 1350°C in air atmosphere and its photoluminescence properties were examined by X-ray diffraction (XRD) and photoluminescence spectra in details. La3SbO7:Dy3+ phosphor with excitation at 353 nm emitted blue light (490 nm) and yellow (580 nm) which were assigned to 4F9/2–6Hj/2 transitions (J=15, 13), respectively. Moreover, the transition 4F9/2–6H13/2 was the strongest emission intensity between two typical emission bands. The CIE of prepared phosphors entered into white region. The optimal emission intensity of the La3SbO7:Dy3+ luminescent materials was realized when x = 0.15 and the concentration quenching mechanism of Dy3+ has also been tested. And the La3SbO7:Dy3+ can be as a white-emitting phosphor applied in n-UV LEDs on results.
Research Progress and Application Status of Thermal Insulation Coatings
Authors: Pan Yue
Published: July 2019

In this paper, the thermal insulation mechanism of thermal insulation coatings was outlined. The research progress of barrier, reflective, radiant and composite thermal insulation coatings was introduced at home and abroad. And the future research direction of thermal insulation coatings was prospected.
Elution Technology of Tubular Vortex Enhanced Diesel-Contaminated Maifan Stone Particles
Authors: Geng Kunyu , Meng Min , Ding Yanliang , Yang Qiang
Published: July 2019

In view of the difficulty in repairing petroleum-contaminated soil, a tubular vortex elution device is designed based on previous research findings in this paper. Using the experimental method, the diesel-contaminated maifan stone was taken as the research object, the process of tubular vortex technology to repair the soil was simulated, and the particle motion visualization research was studied. The optimal structure of tubular vortex elution device was determined by adjusting the form and combination of spiral blades. It is found that the optimal structure of the tubular vortex elution device is that the number of spiral blade channels is three, the lead of spiral blade is 12.5 mm, the spiral blades are arranged alternately in different directions, and the number of spiral blades is four. Under the regulation of the vortex in the tube, the particles not only do the spiral revolution, but also do the rotation movement, thereby strengthening the desorption of the pollutants in the particles.
Research on China’s Manufacturing Industry Upgrading from the Global Perspective
Authors: Ma Yungao , Xia Liyu , Meng Weixuan
Published: July 2019

The global industrial competition is undergoing major readjustment. Accompanied by the re-industrialization strategy of the developed countries, as well as the integration of the new generation information technology and the advanced manufacturing technology, China’s manufacturing industry is facing opportunities and challenges at the same time. This paper analyzed the global manufacturing industry development trend and pointed out China’s manufacturing industry existing problems. In the end, this paper put forward relevant suggestion to promote the transformation and upgrading of China’s manufacturing industry.
Research on the Spatial Pattern of Traditional Villages Based on Spatial Syntax: A Case Study of Baishe Village
Authors: Yang Xiaojun , Kong Ziqi , Li Xiuyuan
Published: July 2019

Along with the rapid development of today’s society, new urbanization has promoted the progress and development of the rural economy, and it has inevitably brought devastating blows to traditional villages, leading to its decline and even disappear. This paper takes the traditional Chinese village Baishe Village as the research object, uses GIS space syntax, constructs the relationship diagram and mathematical model of Baishe village spatial syntax, analyzes the parameter value data, and discusses the village spatial shape and spatial deep structure characteristics based on the analysis results. To provide reference for the protection and development of traditional villages.
Design of Electromagnetic Compatibility Performance of Multi-Node CAN-Bus System
Authors: Zhang Lei
Published: July 2019

In order to improve the electromagnetic compatibility of multi-node CAN-Bus, this paper designs a filter circuit based on the elimination of system conduction noise, and analyzes the noise separation part and filter in the filter circuit in detail, and verifies the validity of the design in the multi - node bus system.
Research on Route Optimization Based on Drop and Pull Transport
Authors: Xu Tongwen , Li Yiru , Yu Xiaohan , Meng Bo , Wang Jing , Qiao Youfeng , Xu Tongwen
Published: July 2019

Many logistics enterprises in China have some problems, such as low transportation efficiency, long waiting time for loading and unloading, low mileage rate. These problems not only increase the operation cost of enterprises, but also hinder the development of logistics and transportation industry to a certain extent. As a new mode of transportation organization, drop and pull transport is widely used because of its advantages of reducing transportation costs, improving transportation efficiency, increasing mileage, reducing environmental pollution, and reducing waiting time for loading and unloading. By studying the advantages and organizational mode of drop and pull transport, this paper analyses the efficiency of full-trailers and semi-trailers. On this basis, combined with the actual transportation of R company, LINGO software is used to establish the transportation model, and the best route scheme based on the trailing transport is obtained.
Effects of Grafting on Sugar Metabolism of Melon (Cucumis melo L.) Seedling under Copper Stress
Authors: Luxi Yang , Yongdong Xie , Wenyi Yan , Zhong-qun He
Published: July 2019

The experiment was carried out with pumpkin ‘JingXinZhen NO.3’ as the rootstock, thin-skin melon ‘IVF09’ as the scion, and self-rooted seedling as the control. The effect of grafting on the sugar metabolism of melon seedlings under copper stress was studied. The results showed that under the condition of copper stress, the growth of melon seedlings was inhibited, the sugar content of leaves decreased, and the sucrose content decreased significantly, and the total activity of sugar metabolism related enzymes changed. However, under the same conditions, the biomass of the grafted seedlings is greater than that of the self-rooted seedlings, and the greater the stress concentration, the greater the grafting promoting effect; Glucose and fructose in grafted leaves were significantly higher than those in self-rooted seedlings, raffinose and stachyose were significantly lower than self-rooted seedlings, the highest ratio of glucose to fructose increased by 5.26% and 32%; and the total activity of sucrose synthase (SS) in the leaves of grafted seedlings was lower than that of self-rooted seedlings. The total activity of sucrose phosphate synthase (SPS), neutral invertase (NI) and acid invertase (AI) was greater than that of self-rooted seedlings. The results showed that grafting could change the sugar activity of seedling leaves by changing the total activity of sugar metabolism related enzymes in melon seedling leaves, and then change the sugar metabolism of melon seedlings to reduce the toxicity of copper stress on melon seedlings.
Study on Nondestructive Testing Methods for Crimping Quality of Steel Cored Aluminum Strand
Authors: Xie Yi , Yang Lei , Wang Sida , Li Dengke , Qiao Yaxia , Zhang Hao , Luo Hongjian
Published: July 2019

The crimping quality of steel cored aluminum strand for overhead transmission lines has a direct influence on the safe and stable operation of lines. The common crimping quality problem of splicing sleeve is analyzed in this paper. It is indicated that the core issues of crimping of steel cored aluminum strand is the inaccurate crimping positioning of the aluminum tube of splicing sleeve. At present, there is no effective and convenient nondestructive method to implement quality supervision during crimping process. Aiming at the above problem, magnetic detection can be used to indicate the relative position between the non-crimped area of steel and aluminum tubes since they have different magnetic properties. We propose to strengthen the crimping quality supervision of steel cored aluminum strand in order to ensure the safe operation of transmission lines.
Variable step-size incremental conductance method used in PV power system
Authors: Chai Ying-bo , Pu XIE
Published: July 2019

The paper presents a new control strategy on MPPT as a result of the disadvantages of the present variable step-size incremental conductance method on MPPT, which is simulated in MATLAB/Simulink. The simulation results show that the new control strategy is obviously better than the previous in terms of the tracing velocity, which is the expected result.
Design of high voltage grid-connected switch energy storage circuit control system
Authors: Zhang Liu , Ma Shaohua , Wang Gang , Wang Lijun
Published: July 2019

The paper proposes and designs the control system of the high voltage grid-connected switch energy storage circuit based on ARM, in order to ensure the normal operation of the power system. In view of the problem that the high voltage grid-connected switch controlled by Lab-VIEW software currently takes a long time for spring energy storage and the system response speed is slow, which is not conducive to timely cutting off the fault source. The hollow current transformer and voltage transformer are used to collect the current signal and voltage signal on the main line of the power system respectively. Then the processed signal is input into the internal analog to digital conversion unit of the system microcontroller for analog to digital conversion, and the processed signal is calculated and judged logically by using the system microcontroller and the principle of three-point method measurement. If there is a defect in the energy storage circuit of the grid-connected switch, the corresponding defect treatment method shall be adopted according to the judgment result, and the electrical isolation switch circuit breaker control instruction signal shall be issued at the same time, and then the system drive circuit shall execute the protection action. At the same time, on this basis, the software structure of the system and the specific process of calculating and processing tasks are given. The results of system performance test show that the designed system can not only ensure the high voltage grid-connected switch to meet the mechanical properties and low voltage action characteristics, but also reduce the energy storage time of the spring, shorten the system reaction time, which is conducive to cutting off the fault source in time and avoiding the expansion of the accident range.
Study on power oscillations suppression strategy of experimental microgrid based on power optimal control
Authors: Dongh H N , Li C , Yao R Y , Zhai X H , Ding X Y
Published: July 2019

The experimental microgrid could provide a platform for operation and testing of the tested microgrid, so that the performance of the tested microgrid could be obtained before it was put into use. The microgrid had different structures, configurations, distributed generations and three-phase unbalanced load, so the voltage, current and power of the experimental microgrid would inevitably oscillate. First, the power oscillations mechanism of multi-source microgrid was deeply analysed, that was, the analytical relationship between active power pulsation and reactive power pulsation was derived and the influence of positive and negative sequence electrical quantities on power pulsation was revealed. Then, a power oscillations suppression strategy based on power optimal control was proposed. Finally, we built a multi-source microgrid simulation model and a power oscillations control system simulation model on MATLAB. The results showed that the control strategy proposed in this paper could significantly reduce the amplitude of power oscillations caused by unbalanced voltage and current. It could be verified that the control strategy was correct and effective.
Prediction of water quality based on artificial neural network with grey theory
Authors: Zhai W , Zhou X , Man J , Xu Q , Jiang Q , Yang Z , Jiang L , Gao Z , Yuan Y , Gao W
Published: July 2019

In this paper, the grey theory, three type of artificial neural network (back-propagation neural network, radial basis function neural network, and generalized regression neural network) and their combination were used to predict the pH values in the evaluation of water quality. Based on the measured data from the Xielugang in Jiaxin with the post-hoc analysis for the c and p values of the prediction, the results showed that the prediction by using the generalized regression neural network has the averaged relative error 0.61%, and c <0.65, p>0.7.
Application of magnus effect and lift blade in high altitude wind power
Authors: Zhang Honglin , Yang Hongwei , Ma Xiaoli , Liu Jing
Published: July 2019

A high-altitude wind power generation system scheme is proposed. The cylindrical airship is surrounded by the lifting blade of H-type vertical axis wind turbine.The blades are used to drive the airship to rotate. The airship rotating under the wind has a magnus effect, and the generated lift maintains the floating state of the airship. The paper establishes its 2D numerical simulation model. The turbulence scheme adopts SST K-ω and the y+ value is controlled between 5∼10. The slip grid method is used to calculate the parameters when the model has a Compactnessl degree of 0.4, and the airship’s lift-to-drag ratio is 7 and power coefficient is 13%, the corresponding tip speed ratio is 2.33. Then in this tip speed ratio, the working condition of the wind turbine at 3∼24m/s wind speed is analyzed. It is found that the power coefficient increases slowly to 16% and the lift-to-drag ratio is between 4∼7. Comparing the torque coefficient difference between the scheme and the H-type wind turbine, it is found that it performs negative work at most moments on the leeward side. The streamline diagram and pressure cloud diagram of the airship blades at different azimuth angles are analyzed, which explains the reason why the airship reduces the thrust and generates lift. It is concluded that the scheme has certain rationality.
Simulation of Grid Paralleling Devices based on back to back VSC-HVDC Converted into UPFC
Authors: Tan Yalan , Liu Jiajun , Wang Kun , Yang Song
Published: July 2019

The back-to-back VSC-HVDC paralleling device structure is similar to the unified power flow controller (UPFC) circuit structure. After completing paralleling operation, the back-to-back VSC-HVDC paralleling device can be converted into the UPFC device through relevant electrical operations. Aiming at the problem of power and frequency fluctuation in the process of conversion, a method of using circuit breaker and switch state as characteristic signals to block or open the signal of parallel side and series side converter is proposed.By this method, a smooth transition from back-to-back VSC-HVDC paralleling device to UPFC device is realized. The method is verified by PSCAD/EMTDC simulation.
The Operating State Assessment of Wind Turbine Based on SCADA System
Authors: Gang Xu
Published: July 2019

Based on SCADA system, this paper evaluates the performance and operation status of wind turbines using improved fuzzy neutralization evaluation theory. In this study, the second rolling average method is used to analyze the characteristics of wind power fluctuation from the differential time scale and fan capacity. It provides a theoretical basis for the normal operation of wind turbines.
Potential analysis of class II reservoirs after water flooding based on core
Authors: jing Xie xiao
Published: July 2019

With the deepening of oilfield development, residual oil distribution has become an important reference for evaluation of oilfield development effect and selection of measures to improve oil recovery. Based on core data of coring wells, through core analysis and comparison between coring wells of different layers in single well and different coring wells in adjacent blocks at the same layer and different coring wells, combined with sedimentary facies zones and dynamic production and development data, this paper analyses and studies the exploitation situation of class II reservoir a II 1-9 in western S oilfield, in order to provide basis for searching for potential remaining oil and formulate more suitable potential tapping measures.
A Method to Improve the Concrete Shrinkage Prediction Based on Short-Time Tests
Authors: Hu Shi-Xiang , Luo Min , Cong Ling , Lin Min
Published: July 2019

The computational accuracy of concrete prediction models is the key to investigate shrinkage influence on performance of concrete structure. Commonly used concrete prediction models are evaluated for their accuracy by comparing their predicted results against the six groups of test data that are collected from published papers. The results show that prediction models were not coincided very well with the experimental data. The phenomenon of concrete shrinkage is a result of several interacting physical mechanisms and is influenced by many variable factors. The shrinkage deformations invariably exhibit large statistical scatter. The calculated results of prediction models could not agree very well with the test results. In order to improve the calculation accuracy of concrete shrinkage prediction models, updating the prediction models based on short-time tests is an effective method. And the general method is not proper because of ill-posed problem. So a new improvement method was proposed and suggested in this study. Seven groups of concrete shrinkage test data are used to evaluate the suggested method. It could be found that the suggested method could match better with the test data.
Study on Influence of Suspension Interval Length on Construction and Closure of Main Girder of Continuous Rigid Frame Bridge
Authors: Zou Lanlin , Cheng Junfei
Published: July 2019

Cantilever pouring construction is a commonly used construction method for continuous rigid frame bridges, but during the construction process, the occurrence of overcasting intervals sometimes occurs. Based on the construction monitoring project of the Bahe Bridge, the finite element software was used to simulate the actual construction process. The measured values of the deflection of the overcast interval were compared with the theoretical values, and the concrete shrinkage and prestressed steel bundles were analyzed. Under the influence of influences on the deflection and stress of different sections of continuous rigid frame bridges with different durations of overcasting. The results show that the variation of the stress of the main beam is small and can be neglected under different conditions of different casting intervals. Different overcasting intervals and different section stoppages have a greater impact on the deflection of the main beam section. In the actual construction, preventive measures should be taken in advance, and the design elevation of the suspended girder section should be adjusted in time to facilitate the construction of the closed section.
Analysis of the impact of accessing the distributed energy storage system on power distribution network
Authors: Zhang Tao , Gong Taorong , Li Dezhi
Published: July 2019

When distributed energy storage on user side is connected to the distribution network, it will have a significant impact on the distribution network. So the reasonable access for energy storage system has become a key problem. Therefore, this paper analyzes the impact on power distribution network loss and voltage stability by accessing distributed energy storage on user side. Firstly, the relationship between voltage stability of distribution network and distributed energy storage access is studied. It is concluded that the distributed energy storage is beneficial to the voltage stability of distribution network. Then the calculation method of distribution network loss before and after distributed energy storage access is analyzed. Finally, the access location of distributed energy storage is simulated and analyzed. Considering the network loss and voltage stability, it is concluded that small capacity distributed energy storage should be connected at the end of the line, and a certain large capacity distributed energy storage should be connected at the beginning of the line.
The most preferred location planning for electric vehicle charging stations considering harmonic pollution based on vehicle behavior simulation
Authors: Mao Yingying , Gong Taorong , Dong Mingyu
Published: July 2019

With the continuous implementation of China’s energy conservation and emission reduction policies, the number of electric vehicles in cities is also increasing. In order to ensure the stable and rapid development of the electric vehicle industry, it is necessary to reasonably build electric vehicle charging stations to meet the vehicle charging requirements. Reasonable location and volume can improve the charging convenience of electric vehicle owners and improve the service life of electric vehicle batteries. In this paper, the charging requirements of electric vehicles are divided into three levels. And Markov chain is used to describe the behavioral information such as driving state, parking position, driving mileage and remaining electricity to obtain different charging requirements. The mathematical model is established with the goal of maximum coverage and consideration of factors such as harmonic pollution. In this paper, genetic algorithm is used to find the optimal charging station location.
Analysis of Economic Activities of Power Grid Enterprises Based on Reform of Transmission and Distribution Price
Authors: Ma Guozhen , Wang Yongli , Gao Shan , Wu Xiangming , Zhao Yang , Wang Shuo
Published: July 2019

After the reform of transmission and distribution price, the profit model of power grid enterprises changed, and the composition of profits and costs were affected. The business activities of enterprises changed greatly. Conducting economic activity analysis can strengthen business management, find the crux of corporate problems, and improve operational efficiency. The paper analyzes the impact of the reform of transmission and distribution price on the economic activities of enterprises, and builds an analysis model of economic activities of enterprises based on total profit, main business cost and main business income. The model can provide theoretical support for the analysis of economic activities of power grid enterprises under the situation of electric power reform, and help enterprises to improve management and tap the potential of enterprises, which has certain practical significance.
Interfacial fracture morphologies of stainless steel clad plates after uniaxial tension
Authors: Li Hao , Zhang Liyuan , Zhang Boyang , Zhang Qingdong
Published: July 2019

The interfacial fracture morphologies of stainless steel clad plates, dividing into stainless steel layer, diffusion layer and carbon steel layer, after uniaxial tension loading are investigated. It is found that the fractures occur randomly along the interface line between the stainless steel and diffusion layers, which could be induced by the stress concentration effect. The relatively high ductility of the carbon steel reduces the stress concentration to avoid the possible generation of the interfacial fracture in its layer. Furthermore, the bonding forces between the stainless steel and diffusion layers determine the distribution of the fractures. High bonding force could retain the interface without fracture, while the fractures would occur in the domains with low bonding force. This work deepens the failure mechanism of the stainless steel clad plates and is useful in the safety evaluation in their applications.
A New Method to Determine the Productivity Equation Coefficient of Low Permeability Gas Reservoir
Authors: Yu Beibei , Li Donglin , Li Hui , Li Qiuyuan , Yang Yan
Published: July 2019

Stress sensitivity exists in the development of low permeability gas reservoir, which leads to the large difference between the productivity of gas well in the middle-late stage and the initial stage. Gas field production usually uses empirical formula to calculate productivity equation coefficient by known well test data or static pressure. However, in actual production, due to economic reasons, well testing cannot be carried out frequently, or interrupted production to obtain the static pressure, so the actual productivity of gas Wells cannot be obtained quickly. This paper combined the material balance equation with binomial productivity equation, and the coefficient of productivity equation is obtained by using the fitting analysis of single well production history data. This method overcomes the dependence of traditional method on formation pressure, and the productivity equation which calculated by this method can reflect the influence of stress sensitivity on gas well productivity, it provides a new method for productivity analysis of low-permeability gas reservoirs.
Research on the digestibility of glutinous rice starch based on high hydrostatic pressure technology
Authors: Wei Jiang , Meng Zhu , Yang Li , Jinlong Wei
Published: July 2019

Glutinous rice was a traditional Chinese crop, made from glutinous rice dumplings, rice cakes and so on by the national favorite. However, glutinous rice itself contains up to 98% amylopectin, so it is difficult to be digested and absorbed in the human stomach. Moreover, traditional food processing technology cannot improve the digestibility of glutinous rice starch. As a new type of food processing technology, high hydrostatic pressure technology had prominent advantages in food sterilization, modification, extension of shelf life, etc. Therefore, it was undoubtedly a new innovation to use high hydrostatic pressure technology to improve the digestion and absorption rate of glutinous rice.
Research and Demonstration on Automatic Generating Algorithm of Distribution Network Investment Statistics
Authors: An Peng , Zhang Jian , Liu Jiaguo , Liu Guoming , Rong Peng , Shan Laizhi , Wang Qing , Yue Caiyang , Yu Baijian , Zhang Wei
Published: July 2019

The statistics and guarantees of the investment completion data of the current distribution network infrastructure projects still use the traditional offline manual calculation method which lacks objective and unified calculation standards. Meanwhile, the number of distribution network infrastructure projects is large, the single investment amount is small, the completion of investment is a large workload, and the accuracy, objectivity and timeliness are poor. It is difficult to adapt to the external investment supervision, the authenticity of statistical data and the objective needs of the development of big data technology. Taian Power Supply Company actively explores the application of information technology to automatically calculate the algorithm of distribution network investment statistics, unifies the calculation standard of investment completion of distribution network projects, improves the quality of distribution statistics of distribution network investment, and improves the lean management level of distribution network investment.
The Assessment of Distributed Photovoltaic Capacity Credit in Courts Considering High Penetration
Authors: Han Ninghui , Tian Shiming , Li Yang , Mao Yingying
Published: July 2019

Due to the intermittent and volatility of photovoltaic power generation, it is generally considered that there is only electricity value and no capacity value. With the high penetration of large-scale distributed photovoltaic access to low-voltage distribution network, distributed photovoltaic will gradually become an important alternative energy source. Based on the theory and experience of domestic and international photovoltaic power generation capacity credit assessment, this paper studies the correlation between distributed photovoltaic season, diurnal power generation characteristics and load. This paper also studies the characteristics of power generation system and characteristics of the power distribution system under high penetration distributed photovoltaic access. A calculation method for the capacity credit of high penetration in multi-scenario courts is proposed to provide support for precision investment.
Air conditioning dispatching and economic analysis of ice storage in urban power grid
Authors: Meng Liming , Chen Lei , Jiang Tuo , Xu Fei , Yao Xingchen , Hao Ling , Yang Shuai
Published: July 2019

Considering the characteristics of hydropower in Chongqing and the on-grid electricity price of power generation, water and wind power, and the time-of-use electricity price of users purchasing electricity, the model of Chongqing large-scale ice storage air-conditioning is established and is optimized based on the minimum power purchase cost of the power grid and the minimum operating cost of ice storage air-conditioning. The goal is to dispatch generators and ice storage air conditioners to maximize the benefits of the grid and users, while reducing the abandonment of water and wind power. The feasibility and effectiveness of the proposed control strategy are verified by simulating the control of ice storage air conditioning under different cooling load requirements.
Analysis on Energy Saving Potential for Pumped-storage and Two-shift Peaking of Coal-fired Units
Authors: Zhang Hong-wei , Liu Junqing
Published: July 2019

North China power grid is mainly a thermal power system, so it is hard to meet increasing need of difference between peak and valley loads and the demand of peak-load regulation. Units peaking mode is directly related to the peaking economy, this paper set up a mode and appropriate economic assessment model for pumped storage and coal-fired power units two-shift peaking. Comprehensive consideration of pumped storage capacity and the factors influencing the load time, the evaluation method was proposed. The application indicates that the method is effective in a peaking cycle. The evaluation method can reasonably reflect the situation of the turbine peaking economy in the coal-fired power plants, and brings the benefits for pumped storage and 300MW coal-fired power units. It provides a reference for energy-saving dispatching. Pumped-storage and coal-fired power units can be used as basis for decision making of peaking shaving mode.
Review of simulation research on pulverized coal combustion in industrial boilers
Authors: Liu Xuemin , Ge Yajun , Qi Guoli , Zhang Songsong
Published: July 2019

The development of pulverized coal industrial boilers was briefly introduced in this work. The numerical research on PC industrial boiler in recent years was summarized. Due to the limited space in the furnace of PC industrial boiler, calculation of flow and temperature distribution in the burner is the focus of numerical simulation. With the increasingly strict environmental protection regulations, NO
x
emission characteristics under different design and operating conditions have attracted more and more attention. The calculation models adopted by different scholars were analyzed, based on which the common models suitable for simulation of PC industrial boiler were concluded.
Computational analysis of multi-energy flow in integrated energy systems
Authors: Tao Jing , Xu Wu , WenHuo Yi , LinLi Yi
Published: July 2019

Integrated energy system (IES) has become the trend of energy development in the future, but the degree of coupling between energy systems in traditional systems is not high, and the power flow calculation method based on power system will be difficult to meet the need for coupled energy flow analysis. This paper firstly uses the coupling matrix of the energy hub to construct a coupled model of the integrated energy system that fully considers the coupling of the power network and the natural gas network; then we use the Newton-Raphson method to calculate the power flow; finally, an example is used to verify that the comprehensive coupled model will have practical significance in the construction and operation of the integrated energy system.
Design of full solar electric push boat for scenic spots
Authors: zhou Qipei
Published: July 2019

In view of the current situation that the scenic cruise ship is still dominated by diesel power, the solar photovoltaic technology is applied to small and medium-sized cruise ships, and solar power generation and ship electric propulsion technology are combined to carry out ship design and optimization, component design and matching, and reasonable. The solar panels on the ship and the dock are arranged to design an all-solar power cruise ship, which realizes zero discharge of the operation process without affecting the sightseeing conditions, and achieves the effect of energy saving and emission reduction.