bluuebunny/crossref_metadata_2025 huggingface dataset:
The approach on joint operation of modified waste oil well and lithium bromide absorption equipment
Authors: Zheng Dayu , Feng Shengnan , Li Menglu , xiong Xue
Published: June 2019

The oilfield left a large number of abandoned oil wells in the exploration process, selected suitable abandoned oil wells to be transformed into geothermal wells with development value, and combined the modified geothermal wells with lithium bromide absorption equipment to produce the required steam or Cold water was used to meet the process and heating or the user’s cold demand. This is a new method of geothermal energy utilization. The method is technically feasible, economically reasonable, and has a very broad application prospect.
Research on the Cooperation-Competition Mechanism of Microgrid and Active Power Distribution Network Based on Game Theory
Authors: GU Ke
Published: June 2019

With the increasing of microgrid(MG) construction and grid integration, the importance of cooperation between microgrid and active distribution network is increasingly prominent. Based on the literature review of the power grid cooperation, the article analyzes the reasons and factors of cooperation between them. A general model of interactive game between MG and active distribution network is constructed to study their revenue problem, discuss the conditions for bilateral cooperation-competition between them, and explores the specific mechanism on both sides. The results show that the conditions of cooperation between the two parties need to meet the benefits of the distribution network greater than the MG; The external cost of cooperation between the two parties is positively related to the level of effort for cooperation between the two sides, and is also positively related to the degree of their cooperation; While the assets of the two parties remain in a fixed proportion, and there is a substitution effect between the externality and their own assets.
Finite element analysis of nozzle selection based on high pressure water jet technology
Authors: Song Gaofeng , Zheng Hongxiang , Wang Yining , Zheng Yangyan , Zhou Yun , Yao Bin
Published: June 2019

High-pressure water jet technology is an emerging type of welding joint strengthening process in recent years, which has unique advantages such as non-polluting, high efficiency, and can strengthen some complicated welds that in dead end position such as fillet welds. However, there is no supporting water jet strengthening nozzle domestically, so this paper uses the computational fluid dynamics method to simulate the internal and external flow fields of the nozzle, which is the most commonly used four conical convergence nozzles with different structure of the current water jet technology, making the flow field velocity distribution of the four nozzles and the impact pressure on the target surface compared and analysed. The results show that the impact pressure and axial speed of the conical short-line nozzle are slightly smaller than that of the conical (13°) nozzle, but conical short-line nozzle’s jet collection property and stability are superior to the other types of nozzles. Therefore, the conical short-line nozzle should be selected when the high-pressure water jet technology is utilized for welding joint reinforcement.
Modal Analysis of Rail Transit Gearbox
Authors: Hu Yunbo , Xie Yanpei , Peng Ruitao , Zhang Shan
Published: June 2019

Modal analysis is an important method to study the dynamic properties of structures. In order to explore the effect of prestress on the dynamic characteristics of rail transit gearboxes, in this paper, a three-dimensional solid model of the rail transit gearbox was established, and the bearing reaction force of the transmission system was obtained by multi-body dynamics method. Considering the force transmitted by transmission system through the bearing seat to the case, the prestressed modal analysis of the rail transit gearbox casing was conducted by utilizing a finite element method, and the prestressed modal of the case was obtained. The modal parameters of the model were compared with the model of the case without prestress. The results manifested that the prestress has a significant on the modal characteristics of the gearbox casing, and the prestress of gearbox casing should be taken into account when conduct modal analysis.
Simulation Research on Defect Detection of Plate Weld Based on Sensitivity Analysis
Authors: Lin Lizong , Chang Haoyuan , Zhang Xin
Published: June 2019

In order to improve the efficiency of traditional local non-destructive testing method in detecting the defects of large plate welds and obtain the equivalent mechanical parameters of weld defects, a method for detecting plate weld defects based on local vibration area sensitivity analysis is proposed. This method does not need to pay attention to the specific form of the weld defect, and it regards the defect as a reduction in the local Young’s modulus. A plate welding model was established in ABAQUS finite element software to simulate the detection process of different defect positions and different defect levels. The results show that the sensitivity matrix constructed with the elastic modulus of 5% change can be applied to the detection of defects with a degree of 3% to 20%. It shows that the proposed method can be used to locate and quantify weld defects with sufficient accuracy.
Research on Cooperative Lane-changing Behavior Based on System Dynamics
Authors: Zhou Xing-nan , Wang Jing-sheng , Zhu Yin
Published: June 2019

This research analyzed the contributing factor relating to the cooperative lane-changing behavior in the framework of system dynamics. From the perspective of traffic management, investigating data includes the current states of response toward lane-changing behavior and a series of factors related to it, in Shenzhen Traffic Police Bureau, China, in both qualified and quantified manner. In addition to that, data related to cars, drivers, environment, and weather in the same period of time were also collected. AMOS was used to analyze data, before simulating the cooperative lane-changing behavior system by VENSIM in order to explore the dynamic influence sequence of various factors on the cooperative lane-changing behavior with the change of time. The outcomes illustrate that different types and levels of traffic management tactics bring to different levels of cooperative lane-changing behavior. By using effective law enforcement and increasing the rate of personnel of learning enforcement properly and enforcement on time, etc. the cooperative lane-changing behavior can be enhanced to a different level noticeably. The evolution changing process appears periodically.
User abnormal behaviour sequence detection method based on Markov chain and SVDD
Authors: Zou Shengyuan , Chang Chaowen , Han Peisheng
Published: June 2019

In order to solve the problem of insufficient use of sequence information and low detection efficiency of traditional anomaly detection methods, this paper introduces Markov chain into user behaviour sequence detection, and proposes a description based on Markov chain and support vector data field ( SVDD) User Behaviour Sequence Detection Method (ASDMS), which first uses the Markov chain to accurately quantify the user behaviour sequence, then constructs the user’s normal behaviour sequence model based on the support vector data field description model, and identifies the user anomaly behaviour. The experimental results show that the ASDMS method has better performance and timeliness than the traditional abnormal behaviour detection method.
Harmonic design of piezoelectric energy harvesting device coupled with electric circuit using topology optimization method
Authors: Lin Zheqi , Wang Xuansheng
Published: June 2019

In this paper, a novel method based on topology optimization is proposed to design the piezoelectric energy harvester connected to the closed electric circuit. The objective function is defined as to maximize the energy conversion efficiency under harmonic dynamic loads. A finite element model which is coupled with piezoelectric-circuit is applied to analyze the piezoelectric energy harvesting systems. Combining the solid isotropic material with penalization (SIMP) method for piezoelectric, an design optimization method that optimizes the piezoelectric material layout was developed. Complex sensitivity analysis was derived and the density function of the SIMP method is updated using the sequence linear programming method. The validity of the proposed approach was demonstrated by numerical example of energy harvester design.
Research on Operational Performance Evaluation System of Urban Waste Treatment PPP Project Based on AHP
Authors: Sun Chunling , Liu Yanan , Zhang Tian
Published: June 2019

Based on the research status of the operational performance indicators of waste treatment projects, according to the relevant standard specifications and accounting the actual operability, this paper established an operational performance evaluation system for waste treatment projects. The constructed evaluation system covers indicators such as economic benefit, social benefit, satisfaction, ecological benefit and project sustainability. The initial data are obtained through questionnaire survey. The weight of each index is determined by AHP, combining the individual indicator status values to obtain the operational performance evaluation criteria. The established indicator system can help managers to provide project management direction, promote the optimization of funding allocation, and improve the operational efficiency of waste treatment projects.
Night curve recognition algorithm based on K-means clustering and improved Hough transform
Authors: Lin Zhiqian , Yongze Zhang
Published: June 2019

In order to solve the problem of poor robustness and real-time performance of existing lane line recognition algorithms in night curve recognition, a fast night curve recognition algorithm based on K-means clustering and improved Hough transform is proposed and implemented. The algorithm firstly intercepts the lower two thirds of the image as the region of interest ( ROI ), then binarizes the ROI image by using the block local optimal threshold method, and then obtains the starting point of the lane line by using the improved Hough transform. Finally, based on the starting point, the lane line in the image is calibrated by using the K-means clustering algorithm. The experimental results show that the method can detect the lane lines of roads turning at night, and is suitable for other roads at day and night, with good real-time performance and robustness.
Study on Deicing Mechanism of High-elastic/salt-storage Functional Pavement
Authors: Zhong Ke , Sun Mingzhi , Wang Xue
Published: June 2019

Snow and ice on pavement surface will reduce anti-skid performance between tire and pavement which will cause traffic safety problem. High-elastic/salt-storage asphalt mixture is a recently widely used functional pavement for snow removal and ice melting. In this paper, a three-dimensional finite element model of pavement structure under five different working conditions is established. Then, the pavement structure under the most unfavorable conditions can be determined through calculating and analysing for the maximum compressive strain index in the ice layer. And the sensitivity of the ice melting effect parameters including ice thickness, temperature, thickness and modulus of high elastic pavement with salt storage were respectively discussed under the most unfavorable conditions.
Analysis and Research on Rubber Joint of the Axle Box Rotary Arm of CRH3 EMU
Authors: Chong LU , Dong Bo , Cao Yu
Published: June 2019

In order to study the stiffness performance of rubber joint of axle box rotary arm for EMU, the rubber joint of axle box rotary arm for CRH3 EMU was studied by combining finite element analysis with experiment. The structural composition of rubber joint of axle box rotating arm and several strain energy functions of rubber hyperelastic materials are described. The material constants of Mooney-Rivlin and Ogden models are obtained by curve fitting of rubber material test data. The radial stiffness and the axial stiffness of the rubber joint of the axle box rotating arm are calculated by using the finite element simulation software, and the experimental verification is carried out at the same time. It is found that the results of Mooney-Rivlin and Ogden models are similar in the case of small deformation, and Ogden model is more accurate in the case of large deformation.
Study on Microstructure and Property of Hot-dip 55% Al-Zn Alloy Coating on 35CrMo Sucker Rod Surface
Authors: Jing Wu , Dong Liu , Linlin Zhang , Xiaopeng Yang , Xu Chi
Published: June 2019

The formation process and corrosion resistance of 55%Al-Zn alloy coating for 35CrMo sucker rod are studied in this paper. The study shows that reduction of Si content in coating bath can reduce Fe dissolving and also keep size of sucker rod stable at the same time. The coating is divided into intermediate layer and Al-Zn coating from inside to the outside. The main components of the intermediate compound layer are made up of Fe2Al5, FeAl3 and Al0.5Fe3Si0.5 by XRD analysis. Corrosion results indicate that the ratio of the weight loss between coated and uncoated sucker rod is 5.9:1 and the corrosion current density is 3:1.
An Improved PSO-FCM Algorithm for Image Segmentation
Authors: Peng Xia , Lin Yao , Zhang Li-Hua
Published: June 2019

FCM algorithm is a kind of soft clustering method widely used in image segmentation, but the algorithm is prone to fall into local minimum and sensitive to initial value. In this paper, considering the local and global optimization capabilities, an improved PSO algorithm is proposed. Image segmentation experimental results show that the improved algorithm not only can effectively avoid the local optimal value due to the manual setting of FCM initial value, but also has better accuracy and anti-noise performance than traditional FCM.
Optimization of Generator Stator End Winding Structure Based on Improved PSO and SVM
Authors: Zhou Yucai , Wang Ting , Bai Hua , Wang Shuyuan , Deng Bo
Published: June 2019

The selection of parameters in the support vector machine (SVM) approximation model plays an important role in the performance of the model. Therefore, the support vector machine parameters need to be optimized. Because the particle swarm algorithm is easy to be premature and easy to fall into the local optimal solution, the improved particle swarm optimization algorithm is used to optimize the parameters, and the support vector machine approximation model with optimal parameters is established. Finally, the support vector machine approximation model of optimal parameters and particle swarm optimization algorithm are combined and used in the optimization of stator end winding structure of large steam turbine generator. The validity of the method is verified by the analysis of the results, and good optimization results are obtained.
Electrochemical Chloride Removal Treatment of Reinforced Concrete at Different Ages
Authors: Guo Yaqin , Liang Duoqiang , Deng Yong
Published: June 2019

Electrochemical chloride removal (ECR) treatment of reinforced concrete at different ages was conducted to investigate to its availability. The experimental method is almost same to others. The experimental results obtained showed that ECE is efficient for the concrete of high porosity or old age.
Investigation on mechanical properties of artificially structured soils under different stress paths
Authors: Zhang Chong , Liu Enlong , Tang Yong
Published: June 2019

Natural soils are structured in deposit process. This is the biggest difference between the remolded soils and natural soils. As one of the stress-dependent materials, different kinds of stress-path have great influences on the mechanical properties of structured soils. Based on the triaxial tests on different kinds of stress path, the mechanical properties of structured soils and remolded soils are discussed in the paper. The main conclusions are as follows: under conventional triaxial compression tests, the sample of structured soils shows strain softening and volume dilation when the confining pressure is lower (25kPa); when the confining pressure becomes large (100 kPa and 200 kPa), the sample shows strain hardening and volume contraction; while, the remolded soils behave stress hardening and volume strain contraction under all kinds of confining pressures. Under triaxial extension tests, the sample of structured soils shows strain softening and volume dilation in the loading process; the remolded soils have strain hardening and volume contraction. Under constant mean stress loading path, the sample of structured soils shows plastic flow and volume strain contraction, while the remolded soils perform strain hardening and volume contraction.
Mechanical Property Study on the Planting Bar Strengthening Structure based on Midas/civil Solid Element
Authors: Li Zilong , Yang Jianming , Kang Fulong , Wu Qiongfang
Published: June 2019

When using Midas/civil solid element modeling to analyses a simple strengthening model by enlarging section method, it is found that the temperature stress of the model without implant reinforcing bars is very large under the overall temperature load, which is inconsistent with the actual engineering situation. When the model is implanted the reinforcing bars, the temperature stress generated by the overall temperature load becomes normal. It can be concluded that the defects of temperature stress anomalies caused by different linear expansion coefficients of different materials can be effectively corrected by implanting reinforcing bars in solid element models. When the defect of solid element model is corrected, its application prospects will become extremely broad, and it may eventually replace the calculation methods of internal force, stress and displacement provided by current engineering specifications.
Key Points of Construction Technology Management in Building Electrical Installation Engineering
Authors: Liu Chenguang
Published: June 2019

Studying the key points of construction technology management in building electrical installation engineering is the key to ensuring that the development of such projects can achieve the expected results. In order to achieve such an effect, this paper will first analyze the common technical problems in building electrical installation engineering, and then propose corresponding construction technology management methods on this basis, in order to provide theoretical reference for relevant construction units and management personnel.
Analysis of Mechanical Characteristics and Anchoring Effect of Bolt in shallow-buried Loess Tunnels
Authors: Jian LI , Chen Kun
Published: June 2019

Based on the current situation of design and construction in loess tunnels, the methods of mechanical monitoring and mechanical characteristics is used for the anchoring effects of bolts in shallow loess tunnels studied in depth. The on-site monitoring results show that for large-section shallow buried loess tunnels, after the bolts are removed from the arch, the construction time of each process can be shortened, which is better for controlling the surrounding rock deformation than the setting of the bolts; the result of theoretical analysis shows that the pattern of displacement distribution in the tunnel arch and the side wall is significantly different. The gradient of displacement from the tunnel vault to the surface is small, the surrounding rock of the arch is mainly sinking, the displacement of the side wall is relatively small, and the attenuation of displacement within the range of the bolt is faster than the arch. The research results will provide a theoretical basis for future advanced support design of loess tunnels.
Comparison Among Several Subsea Ground Settlement And Pore Water Pressure Monitoring Instruments In Offshore Deep-Water Channel Project
Authors: Liu Wenbin , Yan Zhao
Published: June 2019

The monitoring of subsea ground settlement and pore water pressure is key indexes for evaluating the safety of offshore channel engineering cases. The monitoring of settlement and pore water pressure for onshore cases is easy to proposed, and lots of instruments can meet the need. While for offshore engineering cases, the monitoring instruments should survive under extreme bad environment. This paper analyzed several monitoring instruments based on a 12.5 deep offshore channel engineering located at Nanjing city. A suit of instrument was final chosen after comparison.
Coupling Vibration Research on Vehicle-Bridge System
Authors: Zhou Ji-guo , Wang Gui-hua
Published: June 2019

Take vehicle running through a long-span cable-stayed bridge as an example to study the vibration rule of vehicle and bridge in the process of vehicles running on the large span bridge. Vehicle-bridge coupling numerical analysis model is established to study the changing rule of vertical displacement of the vehicle, vehicle wheel vertical contact force, the vertical displacement of the bridge and the impact coefficients of bridge while different quality of vehicles running on the bridge. The results show that, the heavier the vehicle, the greater and the more obvious wave of the vertical displacement change of bridge main-span across. The heavier the vehicles, the more obvious the change of the vertical displacement and torsion angle of cable-stayed bridge main-span across.
Risk Assessment of Water Penetration for Shield Tunnel Construction in Coastal Area
Authors: Wu Bo , Deng Zheng , Huang Wei
Published: June 2019

In the process of assessing the risk of flooding during the construction of shield tunnel in coastal area, the basic probability of accidents is often difficult to be expressed by an exact numerical value due to the fact that the actual statistical data of accidents are too few or missing. In order to solve this problem, this paper, with the factors by combining the fuzzy Bayesian network inference advantages and the advantages of the fuzzy set theory to deal with fuzzy information, using a risk assessment method based on fuzzy Bayesian network method, established the waterfront subway shield tunnel construction risk decision model and predicted the subway shield tunnel flooded the area of probability; at the same time, the sensitivity of each basic event was calculated according to the fuzzy significance to identify the key risk factors, and the applicability and accuracy of this method were verified by combining with the regional engineering of Hujing station ∼ Wanshou station of Fuzhou Metro Line 6.
Seismic performances of highfill airports during the recent strong earthquakes in China
Authors: Meng Di
Published: June 2019

High-fill slope with gap-graded fillback material and impervious clay sublayer is the typical structure of airfield in mountainous area. The seismic response of such slopes under intense earthquake loadings is one of the major concerns in engineering practice. This paper presented seismic performances of three typical high-filled airports during the recent strong earthquakes in China, and the damage/failure mechanisms are discussed. The main finding of this study is that, although no direct airport fill failures were found during earthquakes, cracks formed in airfield by strong shaking could provide passages for rainfall, where preference flows develop gradually and will significantly soften fillback material and impervious clay sublayer, inducing slope failure. Numerical and physical modelling and mitigation techniques are of high priority. After earthquake, timely site investigation, monitoring and slope repairment are greatly needed to prevent destructive deformation during the rainy period.
Effect of bias voltage on microstructure and properties of magnetron sputtering TaN coating
Authors: Yubao Zhang , Zhigang Li , Jinfeng Li , Nan Zhang , Hongtao Zhao
Published: June 2019

A series of TaN films were coated on Al2O3 at various bias voltages by magnetron sputtering technique. Effect of bias voltage on the microstructure, roughness, deposition rate, binding force of coating-substrate, electrical properties of the TaN coating were investigated by X-ray diffraction (XRD), atomic force microscope (AFM), profile meter, scratch tester and four points probe respectively. The results suggest that the TaN coating were formed by face-center δ-TaN crystals and the preferential orientation of the coatings varied with the bias voltage; the deposition rate and the binding force of coating-substrate reached maximum value of 5.71nm/min and 4.5N when the bias voltage was 80 V, the roughness and the square resistance reached the minimum value of 0.509nm and 15.58Ω/□
Single-phase Ground Fault Line Selection for Distribution Network Based on Frequency Domain Parameter Identification Method
Authors: Cheng Siwen , Fu Zhouxing
Published: June 2019

All articles must contain an abstract. The abstract text should be formatted using 10 point Times or Times New Roman and indented 25 mm from the left margin. Leave 10 mm space after the abstract before you begin the main text of your article, starting on the same page as the abstract. The abstract should give readers concise information about the content of the article and indicate the main results obtained and conclusions drawn. The abstract is not part of the text and should be complete in itself; no table numbers, figure numbers, references or displayed mathematical expressions should be included. It should be suitable for direct inclusion in abstracting services and should not normally exceed 200 words in a single paragraph. Since contemporary information-retrieval systems rely heavily on the content of titles and abstracts to identify relevant articles in literature searches, great care should be taken in constructing both.
The Attractive Distribution of the Renormalized Permeability in 3D Case
Authors: Mehedi M F U , Li Zhanke , Liu Zhifeng , Wang Xiaohong
Published: June 2019

In this article, the renormalization process for the permeability and the attractive distribution of the renormalized permeability are investigated. It is known that the attractive distribution is log-normal for 2D case but it isn’t for 3D case. It is discovered that the renormalized permeability from infinite system is independent of the attractive distribution variance. Making use of this important property, numerical simulation is then performed to find the specific form of the attractive distribution. Based on the numerical results, it is shown that the attractive distribution is 1/3-normal in the 3D case.
Application of two-dimensional mathematical model in backwater calculation for flood control evaluation of mountainous rivers
Authors: Jiang Xiu-juan , Han Yan , Du Jun , Jiang Ru-cheng
Published: June 2019

Flood control impact assessment of construction projects within the scope of river course management shall be conducted in accordance with relevant laws and regulations. The calculation of backwater is an important content of flood control evaluation of Bridges across rivers. Two-dimensional mathematical model is a main method for flood control evaluation of backwater calculation. This paper introduces the basic principle of the two-dimensional mathematical model and applies the two-dimensional mathematical model in the actual application of flood control evaluation of the great Darui Railway Bridge of Ruili River, analyzes the changes of water level, flow rate and flow direction before and after the construction of the bridge, and uses the standard formula method to check. The results show that the two-dimension mathematical model has a high accuracy in the calculation of backwater of flood control evaluation of Bridges over mountainous rivers, which can provide scientific basis for flood control evaluation of projects.
Substation Area Backup Protection Algorithm for Phase Comparison of Segregated Current Fault Component
Authors: Zhao Jianwen , Zhang Junming , Zhang Yanqing
Published: June 2019

Substation area backup protection currently only relies on the traditional relay protection principle, and does not fully exploit the inherent fault characteristics in the multi-source data of the station domain. In response to these problems, this paper proposes a substation area backup protection algorithm for phase comparison of segregated current fault component. The algorithm takes all electrical elements in the substation station as the protection object. In light of the phase relationship between external faults and internal faults of the protected electrical elements, the phase relationship is quantified and the fault elements are identified according to the quantified results. A typical 220 kV intelligent substation model was built by using electromagnetic transient software PSCAD. The different fault types, fault locations and transition resistance operating states were simulated. The results show that the fault recognition method based on substation area backup protection for phase comparison of segregated current fault component is accurate and effective.
Study on the Treatment of Aluminum Milling Wastewater by Electrode-Fenton Method
Authors: Li Ru , Wang Peng , Gu JunLi
Published: June 2019

Aluminum alloy chemical milling wastewater is the wastewater produced in the washing process after aviation aluminum chemical milling. According to its characteristics of high alkalinity, high concentration of organic compounds and difficult biochemical treatment, the electro-Fenton method was used in this study. Electro-Fenton method mainly is the Fenton reaction between Fe2+ and hydrogen peroxide produced by electrolytic dissolved oxygen to produce HO⋅, which reacts with organic pollutants and mineralizes. In the experiments, activated carbon fiber and Ti/RuO2 – IrO2 were used as the cathode and the anode, respectively. The experiments showed that the optimal initial pH value of degradation was 3, voltage was 40V, and the concentration of Fe2+ was 0.5mmol/L, plate spacing was 5cm, the concentration of Na2SO4 was 10g/L, the aeration intensity was 125L/h, and the reaction time was 120min, the average removal rate of COD was over 50%. Under optimum conditions, the study established a dynamic model and educed that it could be described with first order dynamic model. The fitting equation is: Cr
=C0
exp(-1.2879C
0
−0.8253
t).
Analysis of converter insulation characteristics and selection of restraint resistors
Authors: Xu Yufu , Chen Kerui , Geng Ning , Zhao Dongsen , Cai Zhiyong
Published: June 2019

The commutation structure is a composite insulation structure composed of oil, paper and cardboard. The converter transformer usually adopts positive and negative adjustment, and the polarity selector generates a recovery voltage and a breaking circuit between the opened contacts during the switching process. It is usually necessary to use a tie resistor to make a potential connection to the voltage regulating winding to limit the recovery voltage. At the same time, in order to shorten the time of the potential resistance access and reduce the no-load loss of the transformer, a potential switch is required to be used in conjunction with the tie resistor. In this paper, the characteristics of the floating potential and the capacitor current during the switching of the positive and negative voltage-regulating windings are analysed. The relationship between the arrangement of the commutating windings and the recovery voltage is given. The positive and negative floating suspension breaking capabilities of the contacts are analysed by examples. The calculation basis for the selection of the binding resistor is given, and relevant conclusions are given.
Growth characteristic of microbubble in a T-junction microchannel in microfluidic chip
Authors: Sun Lixia , Fan Mingxu , Xu Bo , Yu Huadong , Wang Yue , Zhang Yufeng , Li Peng
Published: June 2019

Microbubble formation in a T-junction microchannel in polydimethylsiloxane (PDMS) microfluidic chip were developed. The experiment based on high-speed microscopic camera system was set up to investigate the effects of liquid flow rate, gas pressure and gas channel width on microbubble growth. Three stages of microbubble growth process were obtained through the experiment firstly. The control variable method was used for investigating the growth characteristics of microbubble, including volume change rate and the ratio of length to width. The present study provided an empirical reference for the growth of microbubble in microchannel, which helped to achieve precise control of microbubble volume.
Cr(VI) Adsorption on Acid Modified Diatomite
Authors: Ma Hongfei , Yu Fengmei , Li Wei , Li Zheng , Guo Wenmiao , Yao Xiuqing , Tian Yiming
Published: June 2019

Cr(VI) adsorption onto diatomite has been investigated. Cr(VI) adsorption effects on original diatomite and acid modified diatomite were compared. The adsorption kinetics of Cr(VI) on acid modified diatomite were described by pseudo-first-order and pseudo-second-order models. The experimental data fit to pseudo-second-order kinetics better. Langmuir and Freundlich isotherms were used as the model adsorption equilibrium data. The thermodynamic parameters were evaluated including ΔG (Gibb’s Free energy change), ΔH (enthalpy change), and ΔS (entropy change).
Analysis on the Development Path and Potential of Electrification Level in the Field of Transportation in China
Authors: Wang Chengjie , Liu Xiaocong
Published: June 2019

In view of the current low level of electrification in global and Chinese transportation, this paper selects five key areas to improve the level of electrification, such as electric vehicle, urban rail transit, electrified railway, ship shore power and airport bridge equipment, carries out technical and economic analysis, and studies and evaluates the future development trend of the five technologies. Finally, according to the situation in 2020 and 2030 respectively, this paper carried out the calculation of electrification improvement potential. The research results provide a key path for improving the electrification level in the field of transportation, and analyze the feasibility and future potential of the path, providing a reference for the global and Chinese governments to improve the electrification level in the field of transportation.
Simulation of implementing the function of SSSC converted from grid paralleling device based on power transmission
Authors: Liu Jiajun , Yang Song , Wang Kun
Published: June 2019

Grid paralleling device based on power transmission can be converted into a static synchronous series compensator after grid connecting successfully. At present, the power grid becomes more and more complicated, and short-circuit faults occur frequently. In order to regulate the system power flow and limit the short-circuit current of the system, it is worthwhile to develop the function taking advantage of the characteristics of the existing equipment. In this paper, the control strategy of adjusting power is obtained by establishing SSSC model. Meanwhile, according to the nature of SSSC which can be equivalent to series impedance, the current limiting function of SSSC in the event of short circuit fault is further analyzed. Finally, building the equivalent model of SSSC in PSCAD / EMTDC, the simulation results show that changing the equivalent impedance of SSSC can regulate the flow of line transmission effectively, and prove that SSSC has a certain current limiting function in case of short-circuit.
Casing Failure Characteristics, Prevention and Control Strate gies for Mature Oilfields
Authors: Liu Ying , Feng Mingxi , Sun Guoxin , Liu Zheng , Ma Cui , Zhong Xiandong , Wang Lisha , Liao Ying
Published: June 2019

As the oil and gas fields enjoy a longer and longer production life, casing damaged wells in oil and gas fields increase year by year in number. Assets are at expense, costs are incr eased, and production is threatened. In this paper, the status and mechanism of casing failures in China, USA and Russia are investigated; factors and prevention and intervention measures ar e analyzed; casing failure types, intervals, times and causing factors are studied; failure charact eristics and causes types of mature oilfields are compared and evaluated; and for each different-factor that causes casing failure a corresponding prevention or intervention method is suggested. The studies on casing failure mechanism, detection technology and modeling by overseas countries are worth of reference, and correlative technologies are significant guidance for casing failure prevention and control in our mature oilfields.
A Solution for Indoor Distribution of Overhead Low-voltage Lines in Distribution Network
Authors: Yong Qian , Bin-Bin Zhang , A-Mei Shen , Xiao-Bing Wang , Zhong-Wen Ma
Published: June 2019

The terminal of transformer station in power system is generally related to the household installation of residents. Because of the lack of the security requirements for the original installation mode, this paper presents a new design, and makes a detailed analysis of the new household device. After testing, the new device fully meets the requirements of safety and maintenance for the household distribution of overhead low voltage lines of distribution network. It can be completely applied in the household distribution of low-voltage overhead line terminal.
Ergonomics Rope Self-locking Device Used in Electric Power Construction Field
Authors: Yong Qian , Bo Liu , Guan-Yu Zhai , Bin-Bin Zhang , Xiao-Bing Wang
Published: June 2019

The installation of equipment in power system is generally related to high-place operation where the operator needs to use the self-locking device of safety rope. The traditional self-locking device does not take fully into account the principle of human mechanics, and is not easy to grasp in use. The safety factor is affected. In this paper, the principle of self-locking device is analyzed. The new self-locking device characterized by full function and good use effect is designed, which can better meet the safety requirements of the on-site and high-place operation.
Research Development of Fenton Oxidation and Its Combined Technology in Substation Wastewater Treatment
Authors: Xue Kai , Hou Yaqi , Hou Jiancheng
Published: June 2019

The research progress of Fenton oxidation and its composite technology in substation wastewater treatment is introduced. Study the appropriate conditions for the Fenton oxidation process. The application prospect of Fenton oxidation method in substation wastewater treatment is discussed. The development trend of Fenton oxidation combination technology in substation sewage treatment.
An Efficient Local Search algorithm for Over-Constrained CSPs
Authors: Li Jufang , Chi Yan
Published: June 2019

In industrial experiences of solving constraint satisfaction problems (CSPs), we may often meet an over-constraint situation, which means that we cannot find a solution that satisfies all the constraints. In such situations, the classical CSP is usually extended to take into account costs, preferences, etc. The new objective is usually to minimize the total constraint violation cost or other criterions. The new problems can be described as valued constraint satisfaction problems (VCSP). VCSP can hardly be resolved by the classical constraint satisfying techniques, and this paper provides an application of the Guided Local Search in solving VCSPs.
Complex Network Community Extraction Based on Gaussian Mixture Model Algorithm
Authors: Ting-ting Dai , Yan-shou Dong , Chang-ji Shan
Published: June 2019

Based on the problem of community partitioning in complex networks,this paper proposes a Gaussian mixture model community extraction algorithm based on principal component analysis.The idea of the algorithm is as follows:Firstly,the principal component analysis is used to reduce the dimension of the adjacency matrix of the network;secondly,it is assumed that the communities in a network are generated by different Gaussian models,that is,the generation mechanism of different models is different;The parameters of the model are solved by the expectation maximization algorithm. Simulation experiments show that if the contribution rate of the principal component reaches more than 90%, the network division is very consistent with the actual network,and the time used is also short. Compared with other methods,it has obvious advantages.
Water-Assisted Co-Injection Molding of Non-Circular Tubes
Authors: Kuang T Q , Xu P , Feng Q , Turng L S
Published: June 2019

Water-assisted co-injection molding (WACIM) is a complex and creative injection molding process. A three-dimensional model for WACIM was setup and a k – ω turbulence model was adopted to deal with the turbulent flow of the water. The volume of fluid (VOF) method was used to track the moving interfaces of the skin–inner melt and the inner melt–water. Numerical simulations for the filling stage of WACIM parts with four types of cross-sections were carried out with the computational fluid dynamics (CFD) method. Experiments were conducted to verify the simulation results. The results of the experiments were in agreement with those of the simulations. The cross-section shape of the cavity had a significant effect on the penetrating area of the inner melt, while the shape of the water permeation eventually becomes round. The penetration area of the water increased in the flow direction, and the residual wall thicknesses of the inner melt downstream was thinner than the melt upstream.
Design of a decoupled calibration device for six-axis heavy force sensor based on the orthogonal parallel mechanism
Authors: Lin Sheng , Sun Liguang
Published: June 2019

Six-axis heavy force sensors are widely used in heavy manipulator, but the development of the six-axis heavy force sensor is seriously restricted by the technology of calibration. In order to reduce the positioning error for movement of the sensor or the force source, we employ an orthogonal parallel mechanism as the loading part of the calibration device for six-axis heavy force sensor. The decoupling character is deduced by the force mapping matrix. The calibration device is designed including force source, frame and fixture. The loading mode of the six-axis heavy force is described. The pose error of the calibration device is analyzed. The calibration device can apply the six-axis heavy force simultaneously without moving the sensor or force source.
3D printed pump based on vibrating blades to actively manipulate fluid
Authors: Tang Zhiyong , Shao Xiufeng , Huang Jianze , Ding Guifu , Yao Jinyuan
Published: June 2019

This paper represents a novel working mechanism using vibrating blades to manipulate fluid based on 3D printing technology. A Finite Element Analysis (FEA) simulation has been established to research on working mechanism and driving ability of the vibrating blades-driven pump. The rising popular 3D printing technology is introduced to manufacture the pump, which decreases research time and cost drastically. Herein, a flat oscillating micromotor with extremely low working voltage and power is adopted to act as a random vibration source. The dyeing experiment shows the pump ability of directionally actuating fluid utilizing Fused Deposition Modelling (FDM) 3D printer. A testing system in weighing method is used to test flow rate of different pumps with various structures, receiving a maximum flux of 107.8 ml/min. The pump is characterized by applying structures into pump to actively control fluid. Furthermore, a micropump is printed by a high-resolution 3D printer, which shows potential applications of the 3D-printed vibrating blades-driven pump in manipulating microfluid.
A way to autonomous regulate the scanning speed
Authors: Lei Wu
Published: June 2019

Analysing the basic feature of scanning process, this paper puts forward a new architecture to regulate autonomous scanning speed. In addition, this paper explains and demonstrates how the tracer scanning for successive and self-adjusting scanning speed and autonomy contact level between stylus of tracer and model according to the curved surface. The technical activities shown that the method of copy following error with a proper role and has potential application prospects.
The research of BP Neural Network based on One-Hot Encoding and Principle Component Analysis in determining the therapeutic effect of diabetes mellitus
Authors: Qiao Yuchen , Yang Xu , Wu Enhong
Published: June 2019

The BP neural network is a hybrid algorithm based on One-Hot Encoding and Principle Component Analysis (PCA). In order to make the distance calculation between variables more reasonable, the hybrid algorithm first reduces the dimension of input variables by means of PCA, and then processes the principal component variables with One-Hot Encoding. Thereafter, the BP neural network is established with all the specially processed data. The evaluation system of the diabetes therapeutic effect is established on this hybrid algorithm and the system can reduce the burden of doctors and enhance the treatment efficiency. Compared with the evaluation system established by directly using BP neural network, the BP neural network evaluation system based on One-Hot Encoding and PCA is faster and more accurate in the evaluation of the therapeutic programs of diabetes. It also provides a technological base for the evaluation of therapeutic programs of other diseases.
Research on Automatic Drainage System Technology of Vehicle Gas Storage Cylinder
Authors: Yang Xiaohu , Zhang Ting , Zhang Shimiao
Published: June 2019

In view of the technical problems in the existing technology of the air storage cylinder drainage device in the vehicle braking system, this invention provides an automatic water drainage system for the whole vehicle. An ECU controller is used in this system to control the electromagnetic water drainage valve and sensors to realize intelligent water drainage.
Observation Scheme for Temperature and Deformation of Permafrost Subgrade in Yichun-Bei’an Highway
Authors: Gao Wei , Wang Xu , Zeng Mingming , Han Chunpeng
Published: June 2019

The permafrost in the region of Yichun-Bei’an highway is characterized by thin thickness, high ground temperature and high local ice content, and is in the process of degradation, resulting in highway thaw subsidence and longitudinal cracking, which has a very serious impact on traffic. In order to design the observation scheme reasonably and master the variation law of temperature and deformation of permafrost subgrade, based on determining the observation scheme for temperature and deformation of permafrost subgrade, we established a monitoring system of temperature, humidity change and subsidence deformation of permafrost subgrade after construction by selecting typical permafrost observation sections along the highway, which can provide basic data for the design, construction and maintenance of highway subgrade in permafrost regions.
Study on Expansion Mechanism of Mudstone Under Structural Strength
Authors: Liu Jingyu , Zhang Qianli , Chen Feng , Li Taifeng
Published: June 2019

As the structural swelling soft rock, mudstone’s expansion mechanism is similar to expansive soil, but it has its own particularity. In this paper, based on the analysis of the difference between the undisturbed and remolded samples of mudstone in terms of expansion and deformation, the expansion mechanism considering the strength of mudstone structure was proposed, and the verification test was designed. The following research results were obtained: In judging the potential of mudstone expansion, it is defective to rely solely on the free expansion rate, and its structural strength should be fully considered; The expansive force of mudstone is divided into the external expansive force resisting the external action and the internal expansive force resisting the interaction between internal particles. The external expansive force is the main reason of the increase of the volume of mudstone, and the internal expansive force is related to the cementation strength inside mudstone; The expansion theory based on free expansion rate, expansion force and uniaxial compressive strength is proposed.