bluuebunny/crossref_metadata_2025_split huggingface dataset:
Valley deformation and Stability assement of Plunge Pool slope
Authors: ZHANG Xu , ZHOU Shaowu , DUAN Haibo , LI Wendu , ZHANG Cheng 
Published: June 2019

Abstract
In order to study the valley deformation and rock mass stability of plunge pool slope at the Wudongde hydropower station. We analyzed the deformation law of valley base of site displacement monitoring. Based on the finite element method, the slope stability of different typical profiles on both banks and valley deformation is investigated. The numerical and monitoring results of deformation have a good consistency, and demonstrate that excavating and other perturbations can quicken the creep deformation of rockmass. Through deformation monitoring combined with simulation, rock mass stability analysis and evaluation are reasonable. The nonlinear large deformation of rock mass is considered, and the slope safety factor is obtained quickly. Meanwhile, it is convenient to simulate the instability state and failure process of sliding surface with any landscape and arbitrary shape as well as intuition and applicability.
Site test study of pile-soil stress ratio of composite foundation in karst area
Authors: Han Jianqiang , Li Weike , Huang Junguang , Cui Jie 
Published: June 2019

Abstract
Aiming at the special geological conditions in Karst areas, the pile-soil stress ratio of composite foundation is analyzed. According to carry out the field test of composite foundation in Karst area, soil pressure boxes are arranged to measure the stress of piles and soil at the same time. As the load increased, the variation trend of the pile-soil stress ratio of composite foundation is analyzed. On the basic, the pile-soil stress ratio is compared with non-karst area. The test result showed that both the pile-soil stress ratio of PHC piles and high pressure jet grouting piles increase. The increase of the PHC piles is more obvious. The pile-soil stress ratio of PHC piles is larger than high pressure jet grouting piles. The main reason is that the strength of cement-soil mixed piles is lower. The high pressure jet grouting piles plays an important role in improving soil bearing capacity between piles and supporting the side abutment pressure of PHC piles in composite foundation. It is shown that the stress concentration is more obvious in karst area.
Investigation on microstructure of weld metal of HR3C heat resistantsteel afterservice for 50000 hours
Authors: Xinmei LI , Zhongwen ZhANG , Xiulian LI , Baoshuai DU , Wen LI , Shuai SUO , Yuzhong WEI 
Published: June 2019

Abstract
This paper studied the microstructure of the HR3C steel-welded metal having serviced for 500 hours via metalloscopy, scanning electron microscopy and Energy Disperse Spectroscopy (EDS). As the result shows, the HR3C steel-welded metal remains the cellular-dendrite structure after 500 hours of service, with the number of its precipitated phases increased and its size enlarged. The M23C6 carbide is distributed in the strip or lump pattern along the boundaries of afterbirth-like crystals and dendritic crystals, while it is distributed in the form of small particles close to the crystal boundaries. Cu-rich phase, NbCrN- and Nb (C, N) - precipitated phases are highly stable and small, which accounts for the main reason why the HR3C steel welding joint presents high intensity.
Numerical study on dynamic buckling of composite cylindrical shell with one edge simply supported and opposite edge clamped
Authors: Jia-li BIAN , Zhi-jun HAN 
Published: June 2019

Abstract
Considering stress wave effect, axial inertia and rotational inertia are calculated, and dynamic buckling control equation of cylinder shell is obtained by Hamilton principle based on the Donnell thin shell theory. The dimensionless of the equation is solved by differential method, which discuss about effects of different initial imperfection, different impact mass, different impact speed and different lay-up angle on the buckling of cylindrical composite shell. The result shows significant effects of stress wave and axial inertia on dynamic buckling.
Empirical Method and Finite Element Analysis of Deep Foundation Pit Excavation in Ningbo Soft Soil
Authors: Wu Bo , Peng Yiyong , Meng Guowang , Huang Wei 
Published: June 2019

Abstract
How to analyze and judge the excavation deformation of deep foundation pits in cities has become an urgent problem to be solved. Through the analysis of the excavation monitoring data of a deep foundation pit of a station on Ningbo Metro Line 3, the characteristics of horizontal displacement and surface settlement of the ground-connected wall during the foundation pit excavation in Ningbo soft soil area are obtained. And to compare and analyze the monitoring data by the empirical statistics method and the finite element method. Analysis shows that both can predict the deformation trend of foundation pit. However, due to the regional nature of the deep foundation pit engineering, the prediction accuracy of the empirical curve is poor. Compared with the empirical statistical method, the finite element method has better prediction accuracy, but the finite element method is more complicated. The advantages of the two methods can be applied in the project. In the study of deformation prediction of deep foundation pits, a more in-depth study of the combination of the two methods can be carried out.
Model Experimental Study on Support Structure of Double-row Piles in Deep Foundation Pit
Authors: Wang Yibo , Xia Xiong , Wu Yan 
Published: June 2019

Abstract
The model experiment was designed to analyse the bending moment of pile body and earth pressure of double-row piles. The study finds that the influence of different loading conditions on pile bending moment and earth pressure is uniform. With the increase of pile spacing, the positive peak value of pile bending moment increases gradually. The average increment is about 27%.The trend of change coincides with power function. The positive peak value of earth pressure increases first and then stabilizes. The average increment is 11%. The trend of change accords with the quadratic function of one variable. With the increase of row spacing, the positive peak values of soil pressure and pile bending moment first decrease and then increase. The change relation is in accordance with the quadratic function of one variable. The minimum appears between 5.0d and 5.25d. It can be seen that when the row spacing is small, it can be regarded as a single row of piles. With the increase of row spacing, the two rows of piles share the load together. The structure tends to be reasonable. When the minimum earth pressure occurs, the retaining effect of the structure is the best.
Experimental study of preparing CaS from phosphogypsum with lignite
Authors: zhu Liping , Zheng Shaocong 
Published: June 2019

Abstract
The reaction of phosphogypsum (PG) and lignite is complex, which depends on the reaction conditions and atmosphere. In the paper, it was carried out for reduction decomposition of PG to calcium sulfide under N2 atmosphere. Scanning electron microscopy and XRD were used to analyze the raw–material and decomposition solid production. The reaction mechanism of preparing CaS from PG with lignite were analyzed by Factsage 6.1 and thermodynamic analysis. The results indicated that the decomposition reaction temperature were between 800 °C and 1100 °C. These experimental conditions were also studied on Ca/C molar ratio, reaction temperature and reaction time in the N2 atmosphere. The results showed that the optimal result for production of CaS are found to be a lignite to CaSO4 molar ratio of 2.4 to 1, a temperature of 900-1000°C in reductive atmosphere. Under these conditions the conversion rate of CaS from phosphogypsum amount to no less than 97.3%.
Preparation of Sulfonylcalix[4]arene-loaded XAD-7 Resin for Strontium(II) Adsorption
Authors: Liu Cong , Su Guofeng , Chen Tao , Liang Manchun , Zhao Liting , Zhang Dongxiang 
Published: June 2019

Abstract
Sulfonylcalix[4]arene-loaded XAD-7 Resin was prepared and used as an adsorbent for removal of Strontium(II) from aqueous solutions. The adsorption of the metal ions onto SCA-XAD-7 as a function of pH, contact time, metal ions concentration, temperature, and reuses was investigated. The adsorption capacity of SCA-XAD-7 composite towards tested ions reached a maximum at pH values of ∼6. The adsorption has reached equilibrium within 7 h. The adsorption isotherms were well fitted by the Langmuir model, and the maximum values of adsorption capacity of the adsorbent were 28.87 mg⋅g−1. Thermodynamic studies imply the adsorption was a spontaneous and exothermic process in nature.
Drop impact on a superhydrophobic surface with single groove
Authors: Zhan Haiyang , Shan Chengwei , Lu Chenguang , Liu Cong , Wang Ge , Liu Yahua 
Published: June 2019

Abstract
In this paper, we systematically studied droplets with different velocities impact on grooves with different depths. In the experiment, there are four morphological changes of droplets due to the influence of the impact velocity and the groove depth. Different morphological changes show different spreading characteristics. When the groove depth remains unchanged, the increase of impacting velocity promotes the spreading of droplets in the X (perpendicular to the groove) and Y (parallel to the groove) directions. However, when the impact velocity keeps uniform, the increase of groove depth only promotes the spreading of droplets in the Y direction and has little effect on the maximum spread diameter of the droplet in the X direction. The experimental results also show that the contact time is related to the change of droplet morphology, and their relationship is explained at last.
Evaluating the efficiency of sub regional environmental regulations in China
Authors: Fanyong Zhang , Yueping Du 
Published: June 2019

Abstract
Based on the three-stage DEA-Windows method, we evaluated the environmental regulation efficiency of 30 provinces in China from 2000-2015. Environmental regulations were efficient, with a fluctuation of about 0.66, following the order eastern regions > central regions > western regions, with significant differences between provinces. In addition, regulation efficiency was affected by the level of the local economic development, the industry structure, the FDI index, the population density, and the marketization level. Efforts should be made to strengthen environmental regulations, formulate adequate policies, and coordinate the relationship between economic development, industrial structure, FDI, and environmental regulation.
Analysis of attenuation characteristics of carbon nanofibers to 94GHz millimeter wave
Authors: Wang Hongxia , Li Aijun , Hou Weijun 
Published: June 2019

Abstract
In order to investigate the interference characteristics of carbon nanofibers to 94GHz millimeter wave, we established the corresponding electromagnetic field integral operator equation according to the conductivity and dielectric properties of carbon nanofibers, and solved the equation by the method of moments. The mass extinction coefficient of carbon nanofibers to 94GHz millimeter wave was calculated and analyzed. Lamber-Beer law was used to analyze the attenuation characteristics of carbon nanofibers smoke to 94GHz millimeter wave. The relationships between transmittance and size, conductivity, smoke concentration and smoke thickness of carbon nanofibers were obtained. The results show that the optimum conductivity of carbon nanofibers is related to their size. The longer the length of carbon nanofibers is, the smaller the diameter is, and the more significant the attenuation effect to 94GHz millimeter wave is.
Parameter determination for the Mini-Oscillator Model of the Viscoelastic Material
Authors: Huang Zhi-cheng , Wu Nan-xing , Wang Xing-guo , zelun Li 
Published: June 2019

Abstract
The viscoelastic composite structure is widely used in the vibration and noise suppression of thin-walled components. The vibration analysis of viscoelastic composite structures must involve the constitutive equation of viscoelastic materials. The form of the constitutive equation of viscoelastic material has a decisive influence on the dynamic analysis process of viscoelastic composite structures. Since the constitutive relation of the viscoelastic material changes with time, frequency and temperature, the analysis of the dynamic characteristics of the viscoelastic composite structure is greatly complicated. The mini-oscillator model considers the frequency-dependent properties of viscoelastic materials. Therefore, it is widely used in the dynamic analysis of composite structures. Aims at the need of viscoelastic material passive vibration control for viscoelastic composite structures, a method for determining the parameters of mini-oscillator model is proposed. The method obtains the viscoelastic material mini-oscillator model parameters by parameter fitting by the measured viscoelastic material complex modulus data in the frequency domain or other viscoelastic material damping model expressions obtained from experimental data. The results are compared with fractional derivative model. The results show that the mini-oscillator model can correctly describe stress-strain relationship of viscoelastic material and the parameter fitting method proposed in this paper is accurate and effective.
Application of two-dimensional hydrodynamics numerical modelling in mangrove planting of coastal areas
Authors: Wang Lele 
Published: June 2019

Abstract
A two-dimensional numerical model is presented for application in mangrove planting of coastal areas. The model is discretized with finite volume method based on an unstructured mesh and employs the Roe-MUSCL scheme and the predictor-corrector procedure for time stepping. The model is validated primarily by the observed river runoff data at the upstream of the Jiaojiang River and tidal level along the open boundary obtained with the TPXO7.2 global tidal model. It is then applied to study tidal hydrodynamics in the Dachuan River of the Baisha Bay within the Jiaojiang River estuary during the spring, middle and neap tidal cycles in July and August 2016. The model results show well agreements between the predicted and observed tidal level and tidal current process. Finally, referred to existing research on critical tidal level and duration of Kandelia candel planting in coastal areas of the southeast China, a proper planting condition of K. candel seedlings are determined, after adopting the mean tidal level and duration calculated from the model results.
Numerical Simulation and Analysis of Advance Pre-support for Underground Cross-street Tunnel
Authors: Lijuan Sun , Ziqi Jiang , Bingwei Liu 
Published: June 2019

Abstract
In this paper, the excavation process of a cross-street tunnel construction is studied. In order to ensure the normal construction, three kinds of advanced support combination schemes are preliminarily worked out. Scheme one: leading anchor pipe + sleeve driving small pipe Grouting; Scheme two: horizontal rotary jet grouting piles+ sleeve driving small pipe grouting; scheme three: horizontal rotary jet grouting piles+ large pipe shed+ sleeve driving small pipe grouting; Combined with the existing practical engineering cases, using the finite element software ANSYS to simulate the tunnel excavation process and verify the results, the settlement and displacement curves of the surface and vault and the convergence time history curves of the side walls are compared, and the effect of structural stress control is analysed. Among them, the third scheme has great advantages. Therefore, considering all factors, the third scheme is adopted as the pre-support scheme of the tunnel.
Static load test and evaluation of a separated interchange bridge
Authors: Xijian Liang , Qiuyan Sun , Xingxing Huang 
Published: June 2019

Abstract
The separated interchange bridge described in this paper has a large bevel angel and its superstructure is combined steel and concrete girder. The bridge shakes significantly when heavy-loaded vehicles travel on it. Moreover, the box girder has warped upwardly and the bearing has disengaged with the girder body. Therefore, a static load test on the bridge has been performed. By the test, corresponding results have obtained, damage conditions and bearing capacity have been analyzed and evaluated, and measures to prevent bridge defects have been proposed. Finally, a maintenance and reinforcement scheme has been formulated, which has a reference significance for overall inspection and evaluation of the similar old bridge.
An ALE Approach to the Simulation of Perforating Process
Authors: Pang Mingyu , Sun Feng , Liu Bo , Xue Shifeng 
Published: June 2019

Abstract
Perforation is of great importance to improve the oil and gas wells productivity. This research is to simulate the process of perforating based on the structural characteristics of shaped charge jet and the penetration mechanism. The perforating process is analysed with the Arbitrary Lagrange Euler (ALE) method, including the shaped charge initiation, jet formation, and the nonlinear large deformation. In this paper, the jet shape, pressure and velocity are given, the mechanical behaviour of jet penetrating the casing, cement and rock are described in detail. The simulation model and method used in this research are proved to be reasonable and feasible. The result provides a guidance for the real-time research of perforating process.
Primary design and protection of 110kV substation
Authors: Feng X J , Chen Y Q 
Published: June 2019

Abstract
This paper designs a 110KV substation. Through the analysis of transformer load, the capacity and number of main transformers are selected, and the main connection modes of 110kV, 35kV and 10kV are determined. By calculating the short-circuit current, it can be used to select the main electrical equipment to complete the design of transformer protection and the selection of distribution devices, and draw the main wiring diagram and the plane layout. Finally, we design a simple relay protection, and complete the design of the primary electrical part of 110kV substation.
Effect of magnetite on concrete mechanics and microwave deicing performance
Authors: Huang He , XU Jin-yu 
Published: June 2019

Abstract
Magnetite aggregate is used as a absorbing material. In order to study the mechanical properties, absorbing heat and deicing efficiency and frost resistance of magnetite concrete, I prepared the magnetite aggregate concrete with 0, 20%, 40%, 60%, 80% and 100% magnetite content, which be used to measure the compressive strength, flexural strength and surface temperature rise curve of magnetite aggregate concrete under microwave irradiation. The results show that the addition of magnetite aggregate can effectively improve the mechanical properties and deicing efficiency of concrete. With the increase of magnetite aggregate, the compressive strength and flexural strength increase gradually, and is approximately linear with the content of magnetite aggregate. With the increase of magnetite aggregate, the absorption and heating efficiency of magnetite aggregate concrete increases gradually. When the content of magnetite aggregate reached 100%, the efficiency of absorbing heat and deicing increased by 71.3% and 69.7% respectively.
Improving Peak-load Pricing Method for Provincial Transmission and Distribution Network Considering Power Backflow
Authors: Junjie Qian , Dahai You , Bo Ruan , Qi Zou , Hengwei Liu 
Published: June 2019

Abstract
In view of the power backflow phenomenon in provincial transmission and distribution network caused by the fact that more and more new energy power is connected to the power grid, a provincial network voltage level pricing method considering power backflow is proposed. For exactly describing the complex power transmission relationships among various voltage levels in consideration of power backflow, a new power transmission model is proposed. And the balance parameters of the whole transmission and distribution network are gained based on the transmission data. The problems in cost sharing caused by power backflow are analysed and an improving peak-load pricing method solving the problems is proposed. Conceptions of source point transmission and distribution cost (SPTDC) and load point transmission and distribution cost (LPTDC) are defined. Through calculating the LPTDC in each voltage level, the cost apportionment is accomplished. The case study of a certain provincial power network is carried out and the effectiveness of this pricing method is proved. The results show that this method can recover all the transmission and distribution cost of the network and can authentically reflect the influence of power backflow on the transmission and distribution price.
A Stable Energy Acquisition System Based on Magnetic Circuit Coupled Current Transformer for Transmission Line
Authors: Zhang Pengyu , Meng Runquan , Ren Chunguang , Zhang Ying 
Published: June 2019

Abstract
With the development of smart grids, high-voltage transmission line monitoring devices has become a new research hotspot, but the supply of stable energy for monitoring devices is a difficult point. By utilizing of current transformer (CT) to obtain stable energy from high-voltage transmission lines is one of promising approaches, but the current variation range of the high-voltage transmission line is often too large to be transformed linearly by the traditional electromagnetic CT. According to impedance matching principle, a method to regulate the load impedance of a CT is proposed in order to acquire energy effectively from a transmission line and provide stable output power. The method to regulate the load impedance of a CT can be implemented by controlling a single-phase PWM rectifier. It is proved by experiment that the PWM rectifier can be adjusted to supply a stable 20V output voltage and 9W output power for the DC load.
Short-term wind speeds prediction of SVM based on simulated annealing algorithm with Gauss perturbation
Authors: Chen Yan , Chen Rui , Ma Chunyan , Tan Peiran 
Published: June 2019

Abstract
Wind speed prediction is an efficient means to reduce the downside effects of large-scale wind power generation on the grid, but the behaviour of wind speeds is nonlinear and non-stationary, which yields adverse challenge for its prediction. This work proposes a method of prediction for short-term wind speed, which makes Simulated Annealing Fruit fly Optimization Algorithm based on Gaussian Disturbance (GDSAFOA) to optimize the Support Vector Machine (SVM). In the method, Grey Relational Analysis (GRA) is used to select the factors which influence wind speeds prediction. A time series of wind speeds is decomposed by the Ensemble Empirical Mode Decomposition (EEMD). The wind speeds predication is the linear combination of the SVM and the dynamic neural network model based on the nonlinear autoregressive models with exogenous inputs (NARX). This method is applied for the model with wind speeds data measured from a wind farm in China’s Shanxi Province, where results exhibit that the proposed method is feasible and competitive.