bluuebunny/crossref_metadata_2025 huggingface dataset:
Removal of Vapor-phase Elemental Mercury over a CuO/PG Catalyst
Authors: Cai Simin , Mao Deqi , Sun Jingmei , Xu Can , Xie Xiaojiao , Dong Yanjie , Wang Junwei
Published: June 2019

The removal of gaseous elemental mercury (Hg0) on the palygorskite (PG) supported CuO catalyst (CuO/PG) was studied under N2+O2 atmosphere. This paper describes the effect of CuO loading, reaction temperature, Hg0 concentration and space velocity on Hg0 removal over CuO/PG. The experimental results showed that CuO/PG had a higher Hg0 removal ability than PG, which could be attributed to the oxidation activity of CuO. As CuO loading increased (0-5 wt.%), the ability of CuO/PG to remove Hg0 increased. In the temperature range of 120-210 °C, the highest Hg0 removal ability was at about 180 °C, which might be due to the combined effect of adsorption and oxidation. As the Hg0 concentration and space velocity decreased, the Hg0 removal efficiency increased.
Design and application of eccentric balance flexible pumping unit
Authors: Jinchao XU , Siyuan MENG
Published: June 2019

In the light of the problems of multi-transmission segments, poor movement performance, big volume and weight, large fluctuating range of payload, negative power and torque of beam pumping units, the principle of eccentric balance was suggested, eccentric rotating mechanism is adopted to change the interval of upstroke and down stroke, positive torque with alternating uniformly, energy saving and high efficiency were realized. Basing on the setting up motion and dynamic models of eccentric flexible pumping unit, the motion and dynamic characteristic was analyzed. Field test demonstrated that positive torque can be realized completely, the installed power is decreased 80% and the weight of whole prototype is decreased 25%, system efficiency is improved from 14% to 24.3%, electricity saving reached to more than 50%.
Mold optimization design of metal powder injection product USB interface based on Mold Flow analysis
Authors: Xu Shuqiang , Cao Shukun , Hui Jiheng
Published: June 2019

Metal powder injection molding technology (metal injection molding, the MIM) can achieve a mass in the small and medium-sized complex shape product preparation, low cost, which is of great significance in promoting the production of products and applications.In this paper, taking the USB interface parts made of 17-4ph stainless steel as an example, through scheme verification, the optimized and reasonable die structure is obtained, the 3d modeling of the parts is carried out with UG, and MoldFlow software is used for MoldFlow analysis.The design cycle is shortened and the design quality is improved.
Design and Implementation of Gyro Off-line Test Platform
Authors: Ji Hui , Chen Xiaogang , Ji Haiyu , Chen Ke
Published: June 2019

The off-line test platform of gyroscope is designed, and the functions of the platform are realized by designing the modules such as biaxial electric rotating platform, rotation controller, turntable control software, data acquisition and recording system. It is of great significance for the off-line test and preventive maintenance of gyroscope.
Research on Structural Damage Identification of Truss Structure Based on EMD and Neural Network
Authors: Wang Menghong , Lu Huan , Deng Peiru
Published: June 2019

In this paper, a method was proposed for damage detection of truss structures under natural excitation based on the combination of radial-basis function neural network and empirical mode decomposition (EMD). Firstly, EMD method was applied to decomposing the vibration response data of the rod end node into a series of IMFs (Intrinsic Mode Functions). For the structure’s original response data, after using the EMD to decompose it, the damage information and other useful contents will be distributed into various IMFs. Using neural network’s excellent feature of linear mapping, IMFs are put as an input into the neural network, and the output was compared with the ideal output, which reveals the damage status of the structure. In this paper, experimental analysis and numerical simulation were used to detect the damage conditions of single-damage condition and two different rods in the same truss structure. Good recognition results were obtained.
Study on Improvement of Aging Performance for Gussasphalt Modified by Reclaiming Agent
Authors: Zhong Ke , Sun Mingzhi , Sun Shengkai
Published: June 2019

Gussasphalt has been widely used in steel bridge deck and pavement in China, but it will lead to the pyrolysis aging of gussasphalt binder in the mixing process due to the high temperature and long time mixing. In this paper, the effect of ARA asphalt reclaiming agent on the main performance indexes of gussasphalt at five aging temperatures was studied. It was found that the indexes of penetration and ductility were greatly improved after the addition of the reclaiming agent, and the softening point was regularly reinforced. All the three indexes were improved to varying degrees, which indicates that ARA reclaiming agent had a significant effect on the performance recovery of the gussasphalt after superheat aging.
Design and Analysis of Bionic Rib Subsoiling Shovel Based on Hawaiian Shell
Authors: Tiantao Feng , Lingfeng Xu , Yuepeng Song , Fade Li , Zhanhua Song
Published: June 2019

In order to reduce the tillage resistance in the subsoiling process of soil, this paper uses a three-dimensional laser scanner to obtain the data point cloud on the outer surface of Hawaiian shellfish, and performs curve fitting, and designs 14 bionic ribbed subsoilers with different shapes according to the fitting function. In order to analyze the drag reduction effect of various subsoiling shovels, the average tillage resistance of 14 bionic subsoiling shovels and non-bionic subsoiling shovels with smooth surfaces was calculated. The results show that the tillage resistance of bionic subsoiling shovels is less than that of non-bionic subsoiling shovels, the drag reduction effect of 45 degrees rib angle is better than 30 degrees and 60 degrees, the drag reduction effect is better when the rib width is 30mm, and the number of ribs has no obvious difference.
Analysis of environmental carrying capacity of Beijing-Hangzhou grand canal basin in Zhejiang Province
Authors: Peng Zhenhua , Xu Kaiping , Jin Qiannan , Fu Lei
Published: June 2019

The harnessing and protection of water environment is critical in the comprehensive treatment of the Beijing-Hangzhou grand canal. Zhejiang section of the canal is located in the Hangjiahu plain, and some parts of the canal are still difficult to reach the water quality requirement. Therefore, it is necessary to investigate and analysis the pollutant discharge and water environment capacity. This paper evaluates the current situation of water environment carrying capacity of grand canal in Zhejiang Province, and puts forward pollution control Strategies. Suggestions are also made based on existing problems.
Response Factors and Quantitative Characterization for Moisture Equilibria of Subgrade
Authors: Zhou Zhihai , Chen Fang , Li Cong
Published: June 2019

Water of subgrade soils root in atmospheric precipitation, underground water and wet migration. It is clear that the moisture of subgrade have been inclined to reach equilibrium conditions with surrounding environment after many years for highway operation through investigation for variation law of moisture with seasons alternation. The environmental factors of subgrade moisture can be divided into climate condition and groundwater table based on summary for influence factors of moisture equilibria comprehensively. Prediction method of subgrade moisture consist of conventional estimation, regional classification estimation and enhanced integrated climatic model chiefly. Regional classification estimation has been recommend to forecast moisture equilibria due to quantification for impact of environmental factors on subgrade moisture.
Shear test of the rectangular beam on the new to old concrete interface based on Digital Image Correlation
Authors: Liang Yu , Lei Zhang , Dong Lei , bo Chen
Published: June 2019

The bond property of new to old concrete is the key to strengthen and reinforce the hydraulic concrete structure, and shear strength is an important index of its bond property. With the help of advanced Digital Image Correlation (DIC), the direct shear state, fracture surface displacement, deformation and crack location of the new to old concrete bonding interface are studied through the shear test of rectangular beam, the strain distribution pattern of the bonding interface is well obtained. The results show that the interfacial roughness of specimen has great influence on the shear strength of the repaired specimen. The greater the roughness is, the better the bond property is. Due to friction, the specimen itself will be subject to the combined action of bending and shearing, which leads to bending shear failure of specimen rather than pure shear failure.
Research on the design and application of a monitoring device for bidirectional deformation cracks
Authors: Li Kai-ren , Han Shangyu , Li Yueming
Published: June 2019

The cracks development of geotechnical structures can be generally summarized as transverse deformation and vertical deformation. In order to reduce the difficulty of cracks monitoring and analysis, this paper designs a monitoring device for bidirectional deformation cracks, and analyzes the monitoring principle and scheme of the monitoring device. According to the practical need of bidirectional deformation measurement of geotechnical structures, a set of simple and practical monitoring device is prepared. From the test results, it can be seen that the monitoring device of a monitoring device for bidirectional deformation cracks is convenient to prepare and has high test accuracy, which can meet the monitoring needs of geotechnical structure bidirectional deformation.
Several Problems in Current Implementation of New Concept of Highway Design in China
Authors: Zhu Weiwei
Published: June 2019

Since the new concept of highway survey and design was put forward at the National Working Conference on Highway Survey and Design in September 2004, there are still such problems as lack of wide recognition of new highway design concept, one-sided understanding of the new concept, monotonous road design, and lack of guidance for creative design. Only by enhancing the publicity of new design concept, carrying out multidisciplinary research and exploring new concept design methodology can we sole the above problems and promote the sound and rapid development of China’s highway industry.
Experiment Study on Flexural Behavior of Fire Damaged Prefabricated Hollow Slab Strengthened by CFRP and TRM
Authors: Dong Kun , Sui Zheng-ang , Kexu HU , Jiang Jitong , Derun DU
Published: June 2019

Six prefabricated concrete hollow slabs strengthened with different methods were tested under static loads to investigate the flexural performance and reinforcement effects. First, four slabs were exposed to IS0-834 standard fire for 1 hour, and then respectively strengthened with carbon fiber reinforced polymer (CFRP) sheets or textile reinforced mortar (TRM). Through static loading tests, the cracking load, ultimate load, failure mode of these slabs were recorded and compared. The experimental results indicated that the ultimate bearing capacity and stiffness of strengthened hollow slabs have improved greatly. The slabs strengthened by CFRP have better performance in improving the bearing capacity, while TRM reinforcement method is more effective to improve the stiffness and deformation capacity of the prefabricated hollow slabs.
Influence of cold wave on temperature and stress fields of cylindrical concrete hollow pier
Authors: Zhao Liang
Published: June 2019

Piers attacked by a cold wave, often exhibit uneven temperature distributions, which are direct causes of temperature effects in concrete structures. In order to investigate the influence of cold waves, a three-dimensional transient thermal-structural coupled field method was implemented in a finite element software ANSYS to analyze the temperature filed of concrete hollow pier under a cold wave first. The validity of the finite element (FE) model was verified by the experimental results. After that, the FE model was extended and used to simulate the temperature field and thermal stress of a cylindrical hollow pier under the cold wave. The results show that the circumferential stress under the cold wave is large, and therefore it needs to be considered in the cylindrical concrete hollow pier design.
Study on the Influence of Reinforcement on Creep and Shrinkage Effects of Composite Beams
Authors: Zhang Shengping , Chen Xu , Li Guoliang
Published: June 2019

To obtain time-dependent behaviours of composite beams, the system of differential equations is established by Rüsch constitutive equation of creep. Rigorous solutions of the system are obtained by computer programs of the authors. Creep and shrinkage effects involve internal force redistribution and deflection increase, and these are significantly large for composite beam. Parameter analyse of the reinforcement of concrete slab on these effects is conducted. Among them the reinforcement aggravates significantly the reduction of axial force between individual sections and alliviates slightly the increase of deflection of the beam.
Whole Life Cycle Risk Assessment of Prefabricated Construction: A Structural Equation Modeling
Authors: Huang Zhu , Huang Ting , Peng Ying , Jiang Wen
Published: June 2019

With the rapid development of urbanization in China, prefabricated construction (PC) has attracted the attention of the public but PC is still in their infancy. Therefore, it is necessary to identify the risk factors of whole life cycle of PC. This paper adopts the structural equation modeling to analyze the data of the questionnaire and calculates the weight of each risk index. The research results provide decision makers with reference to the PC cycle risk, and also lay the foundation for the PC risk index system.
Forecast of Water Quality along the Luanhe River Line Based on BP Neural Network
Authors: Lin Hong , Kang Yuanbo , Wang Danyang , Lu Zeyu , Tian Wei , Wang Shuqian
Published: June 2019

In order to understand the changes of water quality in the water, the paper uses the improved BP network of LM algorithm to learn and train the data, and implements the neural network model on the MATLAB platform, and uses the processed samples for the established BP neural network. Learning training, in order to prevent some neurons from reaching the state of supersaturation.By normalizing the data, the trained network is used to predict the water quality indicators of the Luanhe River Line. The results show that it is feasible to evaluate the water quality along the sputum by BP neural network model. The model has strong learning, association and fault tolerance functions. The analysis results and process are close to the thinking process and analysis method of the human brain, which makes the water quality evaluation. The accuracy of the results is greatly improved.
Design Optimization of V-sector Ball Valve Core
Authors: Zhang Hao-nan , Wang Guo-feng , Zhao Qiao-nan
Published: June 2019

In order to solve the problem that the percentage characteristic of V-sector ball valve is poor at the relatively small opening degree, a design optimization flow of valve core is proposed for the first time. The process uses numerical simulation, sample mean evaluation and area average equivalence to calculate the equal percentage characteristics coefficient RQ
of DN65 V-sector ball valve core, and uses experiments to verify the rationality of the process, and further extends it to other models of ball valves. The results show that the original DN65 V-sector Ball valve core does not meet the equal percentage characteristics in the opening area of 28.6 % to 7.1 %. After the optimized design, the equal percentage characteristics coefficient RQ
of the ball valve core has been effectively improved, and the level of increase has more than doubled. And the equal percentage characteristics coefficient obtained by test exceeds the optimized design results. Further extended in the DN100 V-sector ball valve core, it is known that this optimization design method has universal applicability; V-sector ball valve core design optimization method is an efficient and reliable valve core design method, can improve the level of Valve core flow control, improve the valve core design ability.
Numerical Investigation of Flow Field Near the Exhaust Opening Indoor
Authors: Meng Chanjun , Yuan Bo , He Chuan , Xi Chunfu , Pan Liangming
Published: June 2019

Airflow field and effective region for pollution discharge were predicted around a circular flanged exhaust opening, three different turbulent models were employed to simulate airflow field near the exhaust opening indoor. Numerical results show that air velocity decreases gradually in radial direction and axis direction away from origin, and changes most dramatically at corner of the opening. The projection of velocity contour is similar to a semi-ellipse, but when the air velocity decreases, it gradually changes the hemisphere with larger outer radius. When the velocity is 2 m/s, the long axis of the semi-ellipse is 0.70 times the diameter of the exhaust port and the short axis is 0.45 times the diameter of the exhaust port. When the velocity is 0.3m/s, the diameter of the outlet is 1.60 times of that of the long axis and 1.55 times of that of the short axis. The effective area of pollutant emission is similar to the equivalent surface with velocity of 0.3m/s, and its shape is semi-elliptic.
Study on Fire Simulation and Safety Distance of Reactor Thermal Runaway
Authors: Chen Xin , Tao Gang , Zhang Lijing
Published: June 2019

With the development of chemical industry, fire and explosion accidents become more and more frequent. In this paper, a simple analysis is carried out based on the thermal runaway of the reactor, and the explosion simulation is carried out by using the fluent numerical simulation software, according to the standard turbulence model (k- Σ) and the component transport selected EDC- (vortex-dissipative) model. Simulation result intuitively show the pressure, temperature, speed and the relationship between the distance from the center of bums. The results show that the pressure, temperature and velocity decrease exponentially after a certain distance away from the explosion center, the relative safe distance is between 50 and 100 meters in the dangerous area within 50 meters, and in the 100 - meter outside pressure temperature back to normal for a safe distance.
Pretreatment of aluminium alloy milling wastewater by micro-electrolysis process
Authors: Li Ru , Huang Xin , Gu Junli
Published: June 2019

The aluminium alloy milling wastewater belongs to high concentration organic alkaline wastewater, the pH value is up to 13-14, and the COD concentration is 3000mg/L-3300mg/L, if direct discharge into water bodies without harmless treatment can seriously endanger the ecological environment and human health. In this study, the micro-electrolysis process was used to pre-treat the aluminium alloy milling wastewater, and the COD removal rate was the indicator. Under the condition that the mass ratio of iron to carbon is 1:2, the dosage of iron is 67g/L, the pH is 3, and the reaction time is 60min, the average removal rate of COD in aluminium alloy milling wastewater can reach 71.34%. The kinetic analysis of the process of pre-treatment of aluminium alloy milling wastewater by micro-electrolysis process is in accordance with the first-order kinetic model. The dynamic equation is:

C
t

=

C
0

exp

(
−
3.5762

C
0

−
0.6351

t
)

.
Analysis of soil structure effects based on geothermal deveplopment
Authors: Ge Yan. , Wu Ye.
Published: June 2019

With the deepening of people’s understanding of new energy, geothermal has become more and more "hot." The abundant geothermal resources of Henan Province will be an important resource pillar for the future economic growth of the Central Plains[1]. However, the vigorous development and utilization of geothermal resources will largely affect the soil structure. Through the data analysis of Luoyang A area, the influence of temperature change on soil structure was studied by using control variables and single factor experiment. The results showed that: with the continuous development of geothermal resources in Luoyang A area, the total amount of microbes, organic carbon and total nitrogen in the soil would chang with the increase of temperature.Among them, the number of microorganisms growed faster with the increase of temperature and reached the highest value up to 40 °C. As the temperature continuing to rise, the number of microbes growed slowly or on a downward trend.In order to avoid the influence of temperature changes on the soil structure, it is recommended to put insulation materials around the wellhead and the reservoir to prevent the lowest loss temperature from exceeding 30 °C or 3 wells alternating every other quarter[2].
Study on geomembrane seepage property of earth-rock dams
Authors: Peng Yunfeng , Si Dongdong , Wu Hailin
Published: June 2019

As an anti-seepage material, geomembrane is widely used in earth-rock dams engineering. However, the seepage calculation of geomembrane earth-rock dams has not been studied theoretically. According to the permeation mechanism of geomembrane, it can be divided into two categories: one is the permeability of itself; the other is the defect leakage flow. Based on the feedback analysis of the observation data of geomembrane of earth-rock dam, the average permeability coefficient of geomembrane is obtained. Finally, the error sources of clay emulation in seepage calculation of geomembrane earth-rock dams are discussed. The counting error is analyzed and the mathematical model is modified.
Research on the Adsorption Behaviour of Crystal Violet Simulated Wastewater on Fallen Willow Leaves
Authors: Li Wei , Tang Jiayu , Ma Hongfei , Li Zheng , Li Judi , Han Qiuju , Chen Chong
Published: June 2019

The adsorption of crystal violet (CV) simulated wastewater on the fallen willow leaves has been investigated. The effects of adsorption oscillating time, fallen willow leaves dosage, pH value, temperature and so on were examined of CV adsorption on fallen willow leaves, respectively. The result shows that the fallen willow leaves adsorbed the CV simulated wastewater well. The experimental data conformed to the Langmuir and Freundlich isotherm equations. The maximum biosorption capacity is 312.5 mg/g at 298K, which is superior to most reported biosorbents.
Research on New Artificial-Guided Bird Prevention Device Based on Bird Damage Characteristics
Authors: Sun Guang , Wang Dongsheng , Gao Shuyong , Cui Wenliang , Yan Jing , Wang Yu , Wang Jian
Published: June 2019

Aiming at the operation safety for transmission lines in east Inner Mongolia seriously threatened by bird-caused damage in transmission and transformation equipment, according to the analysis of the law of bird activities in east Inner Mongolia, it is found that 463 species of birds are exist in east Inner Mongolia, and the bird damages are mainly caused by larger birds. Through the application effect of existing anti-bird measures, it is found that the current bird-repelling anti-bird measures can reduce the number of bird damages. However, the actual application effect of the anti-bird measures is still limited based on the operational data. Therefore, the guided improvement measures based on the artificial bird guide are proposed, and the corresponding models are made. The comparison with several existing bird-prevention measures is carried out and the test show that the combination of bird thorn of anti-bird measures prevention and the bird guides have a better effect. It is expected that the research can provide reference for the bird disease prevention and control work for east Inner Mongolia Power Grid.
Performance of Autonomous Temperature Controlled Photovoltaic Modules with Water Film
Authors: Li Jinbao , Xi Zeyi , Wu Sen
Published: June 2019

In order to reduce the surface temperature of solar cells and reduce the surface dust and improve the power generation efficiency of PV modules, this paper introduces a cooling device for PV modules based on temperature self-regulation, including PV power generation, circulating water and temperature control system. The theoretical heat transfer model of the experimental device during operation is established. Set the temperature control interval of the temperature control system, and compare the test with the same type of panel with the no-surface film flowing at the same inclination angle. The research showed that when the average ambient temperature is 21.61 °C, the average temperature of the panel without water film cooling is about 35.37 °C, and the average temperature of the panel with the water film cooling is about 25.53 °C, which achieves the purpose of cooling and temperature control. At the same time, the output power of the water film cooling panel is relatively increased by about 13.57%. In summary, the water film cooling device in this paper can effectively reduce and stabilize the temperature of the PV module, reduce surface dust and increase its output power.
Laser infrared thermography detection for aviation carbon fibre composites
Authors: Wang Qiang , Qiuping Hu , Ming Liu , Liu Yang , Xinyi Li , Hongbin Zhou
Published: June 2019

Aviation safety is the focus of aviation field. In this paper, two different heating ways of modulated lasers were used to heat the aviation carbon fibre composites with internal defects. The results show that, after expanding, the unevenness of laser energy distribution has a great influence on the detection effect. In order to solve this problem, we obtained the reference temperature information by using the defect-free surface inside the specimen. After the difference between the obtained temperature information of the internal defect surface and the internal defect-free surface, the internal defect information of the specimen was successfully presented. At the same time, it is found that compared with the square wave heating, the effect of sine wave heating on detecting the internal defects of the specimen is more obvious. There are two main advantages of using laser infrared thermography to detect aviation carbon fibre composites: (1) the detection time is short, which only need a few seconds to complete the detection process; (2) the heating area can be adjusted by the distance between the specimen and the laser, which will make the detection more flexible.
Fault Characteristics of CFRC Unidirectional Laminated Plate Based on Acoustic Emission
Authors: Lu W X , Tang J J , Chu F L
Published: June 2019

Carbon fiber reinforced composites (CFRC) are increasingly being used as raw materials of important components in the industrial production owing to its characteristics of lightweight, high-strength and corrosion resistant performance, And acoustic emission technology, as a new nondestructive testing technology, is widely applied in the fault diagnosis of CFRC laminated plates. In this paper, the tensile failure test of unidirectional laminates is carried out. The acoustic emission technology is applied to analyze the typical faults, matrix cracking and fiber-matrix debonding. Based on principal component analysis and fuzzy c-means clustering, the two faults are identified, and the acoustic emission characteristics of CFRC laminated plates in the whole failure process are obtained, which may be helpful for actual fault diagnosis.
Finite element analysis on mechanical behavior of flange reinforced connections between wide-flange specially shaped composite columns and steel beams
Authors: Hongxue J , Jie G , Jie B
Published: June 2019

A parametric model for steel beam to wide-flange specially shaped composite column flange reinforced connection is analyzed by ABAQUS with varying parameters. The results are in good agreement with the experimental ones and the reliability of the calculation method is verified. Then the influence of the geometric parameters of the reinforcing plate on the stiffness, bearing capacity, plastic zone and ductility of the joints is analyzed. The results show that the triangle reinforcing plate can achieve the same effect as the trapezoidal reinforcing plate. The length of the reinforcing plate is 1 to 1.2 times that of the steel beam, the width may be 1/4 to 1/3 height of steel beam, and the thickness may be 1.2 times the steel beam flange thickness.
Influence of shield tunnel construction on neighboring building
Authors: Dai Jun , Liu Lei
Published: June 2019

The construction of underground project or the underground tunnel will influence the subsiding of neighboring building on the earth surface. In view of soil disturbance, 2D finite element method is adopted in this paper to study and shield tunnel construction of adjacent structures. Our research indicates that surface settlement together with force and deformation of the lining increase by the existence of buildings, simultaneously, additional stress and deformation of adjacent structure are induced during tunnel excavation construction. When L/D = 0.5 to 2, great surface settlement is produced with more settlement difference between building head and tail, and the building is in danger in the region. At the same time, the value of inner force also increases obviously. Out of the region, the influence on the buildings is ignored.
Numerical and experimental study the effects of river width changes on flow characteristics in a flume
Authors: Zhou S F , Wang X K , Yang Q Y , Huang Z W
Published: June 2019

The gradual characteristics of variations in transverse width often occur in mountain river because of the effect of geological conditions and river evolutions. This will influence flow and sediment transport due to the variations of flow structures resulted from the river width changes. A flume experiment that was conducted to explore how flow characteristics perform with the varied channel width, showing the connection of the flow parameters, flow rate and channel width. For example, the longitudinal water depth and velocity change along with the transition width of flume. On the other hand, a depth-averaged two-dimension model was proposed according to series of methods such as body-fitted coordinate, finite volume method, SIMPLER algorithm. The numerical results agreed well with the experimental observation in a flume, which showed that the model could reasonably simulate gradual channel transition flow. In addition, the validated numerical model was applied to simulate flow with different flow rates with the same imposed boundary condition in order to further analyse the effects of channel width variation on flow characteristics.
Experimental Study on the Strength of the Side Bored Pile After Post Grouting
Authors: Qinglan Qi , Yanqiang Gong , Liting Zhang
Published: June 2019

Due to different soil strengths, drilled bored piles and slurry-supported bored piles affect the side friction. Through the application of post grouting technology, the friction resistance and bearing capacity of piles can be improved. In this paper, an analysis was conducted on the strength increasing rule of the side drilled bored hole and the side slurry-supported bored pile after post grouting at different ages, by means of chemical reinforcement. The results show that: the post grouting technology has better effect on the slurry-supported bored piles, especially in poor ground conditions, and that the strength on the 120th day can be used as the design strength. Our research achievements can provide a theoretical basis for the post-grouting technology in engineering work.
BIM-based Fine Cost Management of the Whole Process
Authors: Zhang JiaYuan
Published: June 2019

This paper applies the fine management to analyze the specific work and existing obstacles in each stage of project cost management, then proposes that BIM could be technical support for fine management and solve the existing obstacles. On this basis, this paper expounds the concept and characteristics of BIM and demonstrates that the implementation of fine management in the whole process of cost management must be supported by BIM. Finally, based on the characteristics of BIM technology, the application framework of BIM in the whole process cost management process is proposed and the specific application of BIM technology in the whole process cost management is analyzed, which provides ideas and methods for fine management using in construction engineering cost management.
Numerical investigation of the backfilling material thermal conductivity impact on the heat transfer performance of the buried pipe heat exchanger
Authors: Song Xiao-qing , Jiang Ming , Qin Peng
Published: June 2019

Based on the in-site thermal response experiment of a shallow geothermal energy plant in Guiyang, a model characterizing the heat transfer process between well-backfill material-ground material of a buried double vertical U-tube underground heat transfer system is established. Moreover, the influence of the thermal conductivity of the backfill material on the heat exchange efficiency for the summer condition is investigated. Results show that the maximum error between the outlet water temperatures calculated from model and obtained from field testing is less than 1.7%, which verifies the correctness of the model. When the thermal conductivity of the backfill is low, the heat in the buried heat exchanger is basically limited in the domain of the borehole. Furthermore, it is observed that the heat transfer efficiency increases, as the thermal conductivity increases. When the thermal conductivity of the backfill is close to that of the surrounding rock, the heat transfer efficiency increases in a faster rate. However, when the thermal conductivity of the backfill further increases, the heat transfer efficiency insignificantly increases. It is found that higher thermal conductivity of the backfill material has limited improvement on the heat exchange capacity of the buried pipe.
The Three Memos—Analysis of “Vers Une Architecture” From the Perspective of Modern Architectural Development Practice
Authors: Jiang Yu
Published: June 2019

In “Vers Une Architecture”, Le Corbusier presents a complete theory of modern architectural design method and modern architectural aesthetics. Combined with the development of modern architecture, this paper reviews and analyzes the application of this theory in practice. Through these reviews and analysis, this paper attempts to prove that this theory still has a strong vitality in the current architectural practice. From the perspective of the development of modern architecture, some parts of this theory are flawed. This article also attempts to analyze and supplement these defects.
Brief discussion on the design of route selection in mountain areas of suspended monorail
Authors: Han Bing , Cheng-zhang OU
Published: June 2019

The design of route selection in mountain areas is the foundation and soul of survey and design of suspended monorail transport, which directly determines the project cost, operation cost and so on. As the corresponding technical standards or design specifications of the suspended monorail have not been formally promulgated in China, this paper expounds the structure form and technical characteristics of the suspension monorail, and analyzes the key points of the route selection technology of the suspended monorail in mountain areas in order to provide a reference for the similar project in mountain areas.
Research on Application of Reptilian Technology in Tax Management Achievements
Authors: Han Junhua , Zhou Quan , Han Heyang
Published: June 2019

In the era of big data and internet, huge network data increases the information asymmetry of tax collection and management, such as the aggravation of information asymmetry caused by new tax sources, single access to information, imperfect tax information sharing platform, and tax risk deficiencies, which brings about the problem of tax collection and management. But web crawler technology can automatically crawl on the Internet and search tax-related data, which greatly improves the ability of tax inspectors, the efficiency of tax management and the quality of tax service. There are some shortcomings in reptilian technology to improve.
Analysis on the Effect of the Uncertainty of Outside Power on the Equilibrium of Joint Energy and Reserve Market
Authors: Zhu Bingquan , Lin Kaiying , Zhao Nan , Li Jihong , Xiao Yanwei , Wang Beibei
Published: June 2019

As a major way to consume new energy, energy transmission across provinces and regions has increased rapidly in recent years. It is of great importance for the construction of the spot market to study the impact of different uncertainty of the outside power on the joint energy and reserve market. Firstly, this paper establishes a joint energy and reserve market equilibrium model that takes into account the uncertainty of the outside power which leads to additional reserve demand. Secondly, a game equilibrium algorithm is proposed to solve the market final equilibrium. The simulation results show that the uncertainty of the outside power will not only reduce market efficiency but also damage the interests of the outside new energy generator itself.
Research On Neural Network Quality Prediction Model Based On Genetic Algorithm
Authors: Li Xia , Dai Yiru , Cheng Jin
Published: June 2019

In industrial production process, it is difficult to predict product quality in advance. Traditional prediction methods are mostly based on complex mechanism models, and the prediction accuracy is not high. This paper uses the historical data of industrial production to forecast, constructs the quality prediction model of neural network, and uses genetic algorithm to optimize the network parameters, so as to avoid the neural network falling into local optimum. This paper takes the data of hot rolling production line as an example and adopts the method to predict the quality index of steel plate. The simulation result shows that the quality prediction model of neural network based on genetic algorithm has better prediction ability. This method has important theoretical value and practical significance for production workers to improve product quality.
Study on Heat Transfer characteristics of Fluid-solid Two-phase Flow in a spiral slice inserted Tube
Authors: Shu Mengmei , Qing Defan , Chen Zhuo
Published: June 2019

The heat transfer performance of the liquid-solid two-phase flow in the heat transfer tube with spiral slices insert was analyzed. The influence of the pitch of the spiral piece, the height of the spiral piece and the volume concentration of the solid particles on the heat transfer and the resistance of the tube was simulated by Fluent software. The results show that the heat transfer performance of the tube in which the spiral piece is inserted and passed into the solid particles is superior to that of the smooth tube. And the heat transfer enhancement is up to 55.48% compared with the smooth tube. The heat transfer tube enhances heat transfer accompanied by an increase in resistance. The values of the comprehensive evaluation indicators are all greater than 1. The comprehensive heat transfer performance of the tube is significantly enhanced.
The Grid Voltage’s Asymmetrical Fault Detection Method based on Variable-Step LMS Adaptive Notch Filter Algorithm
Authors: Wang Yifan , Wang Shuhong , Zhang Ailing , Wang Jingxuan
Published: June 2019

For wind turbine systems (WTS), the grid voltage fault detection algorithm determines the response speed of WTS to grid voltage fault. This paper proposed a sort of voltage asymmetrical fault detection method, to detect negative-sequence component in grid voltage, variable-step (VS) least mean square (LMS) adaptive notch filter (ANF) is applied to eliminate the 2nd-harmonic frequency component. The application of ANF can separate negative-sequence component from grid voltage, therefore the voltage asymmetrical fault can be detected; the self-tuning of controllable parameters of ANF can be realized by the LMS adaptive algorithm, which is convenient and efficient in practical application; furthermore, because the variable step size adjustment is adopted, the contradiction between convergence rate and steady-state error of ANF can be solved. The MATLAB/Simulink simulation and FFT analysis results are in conformity with the theorical analysis, which proves the feasibility of the method.
DC magnetic bias suppression strategy for series transformers in dynamic voltage restorers
Authors: Wang Ziang , Meng Runquan , Sun Zhi
Published: June 2019

In actual engineering, the dynamic voltage restorer is mainly used to protect the load from the voltage drop of the grid, and is inserted between the grid and the load through the series transformer. The dynamic voltage restorer (DVR) can easily cause DC bias and generate magnetizing inrush current at the beginning of compensation voltage drop. This is also a common problem in DVR engineering applications. The usual way to solve this problem is to design the transformer core to twice the rating, but this will greatly increase the size and cost of the transformer. In order to ensure the safe, reliable and stable operation of the DVR and reduce the cost and volume of the transformer, it is necessary to suppress DC bias of the transformer. Based on the principle analysis of the DC bias generation in series transformers, a DC bias suppression strategy was proposed to control the amplitude of the first half of the output voltage of the DVR. The DVR system model was built in Simplorer, Matlab and Maxwell for co-simulation, and the effects before and after the DC bias suppression strategy were compared.
The demand and proliferation for electric vehicle charging stations
Authors: Liu Fangyu , Zhao Zhengpeng , Xu Jiacheng
Published: June 2019

Because of the renewable nature of electric energy, many countries have begun to develop the electric vehicle industry and achieved remarkable results. After conducting an investigation into the field of EVs (Electric Vehicles), we analyzed the basic situation, quantity, development status and government policies of the EVs nowadays. Based on the analysis of the charging stations and EVs, a model was set up for the corresponding charging station construction programs and promotion methods, for the purpose of predicting future trends. Based on the knowledge of complex networks, we discovered that the overall development of EVs resembles the global spread of viruses. We use the model to give a time forecast of the complete conversion from gasoline vehicles and diesel vehicles into EVs in each country.
Study on the Optimal Configuration Strategy of Photovoltaic and Energy Storage in Distribution Network
Authors: Zhu Jiawei , Jia Yanbing , Xie Dong , Luo Gang
Published: June 2019

Aiming at the scenario of joint optimization of distributed optical storage in distribution network, this paper takes the maximum net profit of optical storage system as the goal. At the same time, this paper considers the high cost of energy storage battery, and combines the load characteristics, the energy storage operation characteristics and China’s electricity price policy to construct the optical storage system investment income model. On the basis of satisfying the power balance and the performance constraints of the energy storage battery, an optimization model considering the net profit of the optical storage system is established, and the YALMIP toolbox and CPLEX program are used to solve the problem in MATLAB. Finally, the results of the energy storage configuration are tested in the IEEE-33 node system. The test results prove the effectiveness of the optical storage joint optimization configuration strategy based on the net profit of the optical storage system as a technical indicator.
New Presentation Method of Human-Machine-Interfaces for EMS
Authors: Huang Xiaoyun , Huang Andi
Published: June 2019

Power demand is constant increasing, so power networks are push to the operation limits. Traditional presentation of SCADA/EMS HMI(Human-Machine-Interface) is not more suitable to this situation. Various technology such as AI base alarming, dynamic coloring, contour, map based diagrams, new presentation methods are purposed. New method for indication and measurement alarm processing, measurement presentation, topology presentation, risk assessment presentation, KPI presentation, map based presentation are implemented. Through these presentation techniques, the operators can comprehend the system information easily and more accurate, then more proper action can be promptly taken to ensure the power networks operate more safely and more economically.
Technical and economic analysis of the coupling of optical axis heat supply and thermal storage peaking of 200 MW unit
Authors: HE Xiao-hong , Gao Xin-yong , Wang Hong-shi
Published: June 2019

Based on two 200MW three-cylinder and three-exhaust steam condensing units, the economic analysis of the unit connected pipe extraction, optical shaft heating and heat storage technology is carried out. Through these analyses, the coupling of the Optical shaft heating and the heat storage technology can not only give full play to the heating capacity of the unit, but also realize the “thermoelectric decoupling” and improve the flexibility of thermal power. Under certain external heat load demand, the power generation load can be reduced to 88MW when optical axis heating (only 44% of rated load). Besides, there is an optimal combination scheme. The annual policy subsidy is up to 424 million Yuan and the investment recovery period of the project is 5.6 years. The economic benefit of this project is obvious. It is recommended that the technology be applied to areas with a peak grid subsidy policy.
Coordinated Speed Planning Strategy of Scraper Conveyor and Shearer Based on Scraper Conveyor Loads Analysis
Authors: Wang Yanping , Wang Shaoying
Published: June 2019

In order to improve the loads stability of scraper conveyor, an integrated coordinated speed planning strategy of scraper conveyor and shearer based on scraper conveyor loads analysis is proposed to avoid impact of large load fluctuation to continuous and efficient production. The scraper conveyor loads analysis is provided as foundation of the research. Multi-objective optimization model and particle swarm optimization (PSO) algorithm are introduced and processing method based on multi-objective PSO for speed planning is established. Furthermore, a simulation example is presented and the results indicate the proposed method is outperforming traditional speed set mode. Finally, an application experiment in ground simulated fully-mechanized face is demonstrated the practical effect.
Research on Evaluation Index System for Power Market in China
Authors: Su Yang , Li Ma , Menghua Fan , Yanyuan Qu , Zechen Wu , Xiaoxuan Zhang
Published: June 2019

Since the 9th document issued by the Government, China’s power market construction process speeds up. It is necessary to build a quantitative electricity market analysis and evaluation tool for power market design, operation, supervision and decision-making of market participants. This paper studies the tools and methods of electric power market evaluation under the situation of electricity system reform in China, and takes the influence on power industry development and various related groups into account. The main evaluation indexes include promoting the optimal allocation of resources, promoting the sustainable development of power industry, market efficiency, and orderly operation of the market, impact on related groups.
Conducting Polymers Based Composite Electrode Materials in Supercapacitor Application
Authors: Ma J , Su D Y , Liu Z G , Jiang L , Hao J , Zhang Z J , Meng X K
Published: June 2019

Recently, as a new type of energy storage material, conducting polymer has attracted much attention due to its excellent electrochemical properties. We summarize research on polymer based composite electrode materials and supercapacitors. The conducting mechanism, advantages and disadvantages in supercapacitor electrodes were reasoned through extensive based on the extensive analysis of the literatures., and new trends based on conducting polymers material and capacitor development are reviewed.