bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the properties of composite mineral admixture material for rapid repair
Authors: Du Tianling , liu Ying 
Published: June 2019

Abstract
In this paper, the active mineral admixture was used to prepare the quick repair material that meets the requirements of 24h service. The development of the late strength, the shrinkage performance and wear resistance of the 60days were studied. The experimental results show that the composite mineral admixture is used to prepare the material for rapid repair, not only the early strength is high, but also the later strength is steadily increasing, and the dry age of 60 days is reduced, and the wear resistance is good. The use of industrial waste has certain economic and social benefits.
Evaluation of intergranular corrosion susceptibility of Super304H steel after being aged at 600°C
Authors: Zhong-wen ZHANG , Xiulian LI , Xin-mei LI , Yong ZOU , Bao-shuai DU , Shuai SUO , Wen LI 
Published: June 2019

Abstract
The susceptibility to intergranular corrosion of as-received and 600°C aging-treated new austenite heat-resistance Super304H steel was investigated by double loop electrochemical potentiodynamic (EPR) test. Experimental results indicated that the as-received Super304H steel possesses lower tendency of intergranaular corrosion. With the increase of aging time, intergranular corrosion susceptibility of Super304H steel increases. Intergranular corrosion of Super304H steel occurs due to the precipitation of Cr23C6 along grain boundaries. At the initial stage of aging, the rapid precipitating behavior of Cr23C6 leads to the rapid increase of intergranlar corrosion susceptibility. The amount of Cr23C6 precipitates increases with the extension of aging time, and the intergranular corrosion susceptibility of Super304H steel increases accordingly. The extent of intergranular corrosion change is related to the precipitating rate of Cr23C6. ()
Brief Introduction of Engineering Property for Coarse Grained Soil
Authors: Liu Mengshi , Shi Xiaowang 
Published: June 2019

Abstract
Coarse grained soil has been widely used in engineering construction for their excellent physical and mechanical properties. This paper presents the influence factors of shear strength, static and dynamic deformation characteristic of coarse grained soil, and finds that the dynamic property of coarse grained soil under cyclic load would be an important research direction.
Determination of Mountain Flood Warning Index Based on Distributed Hydrological Model
Authors: Hu Yu-bin 
Published: June 2019

Abstract
Mountain flood in small watershed comes unexpectedly, and the determination ofwater index is hard. Combined with the actual situation of Miaoxia Watershed, this paper proposes a design of flood calculation method based on HEC-HMS distributed model, and determines mountain flood warning index by using the method of water level backstepping discharge. The result calculated by this paper’s method has little difference compared with those using rational formula or instantaneous unit hydrograph, and the determination of the warning index is basically reasonable. The applied results shows that the determination of mountain flood warning index based on distributed hydrological model is simple and feasible, which is consultative for mountain flood warning index selection.
Effect of Active Admixture and Air Entraining Agent on Frost Resistance of Volcanic Scoria Thermal Insulation Plastering Mortar
Authors: Liguang Xiao , Genzhuang Li 
Published: June 2019

Abstract
The effects of fly ash, slag powder, diatomite and air entraining agent on the mechanical properties and freeze-thaw resistance of volcanic scoria thermal insulation plastering mortar were studied by orthogonal test. The test results showed that the thermal insulation plastering mortar achieves the best performance when the replacement rate of fly ash was 20%, the substitution rate of slag micropowder and diatomite is 10%, and the amount of air entraining agent is 0.1%. Compared with the ordinary thermal insulation plastering mortar, the 28d compressive strength is increased by 17.8%, the strength loss rate was reduced by 34.5% and the quality loss rate was reduced by 43.3%. Observing the microstructure of the thermal insulation plastering mortar by SEM, active admixture is beneficial to improving the structure of the hydration product and improving the compactness of the thermal insulation mortar.
The Normal Dynamic Stiffness Model of Joint Interfaces Based on Fractal Theory
Authors: Liu Wenwei , Wang Yuanhang , Li Xiaobing , Yang Jianfeng , Dong Chengju 
Published: June 2019

Abstract
To solve the problem of the poor dynamic performance of the machine due to low stiffness of joint interfaces, a theoretical normal dynamic stiffness model of joint interfaces based on fractal theory was proposed. An improved three-dimensional WM fractal function was used to characterize the contact surface, the vibration differential equation of the sphere-plane dynamic contact was established, the linearized stiffness of asperities in elastic deformation and elastoplastic deformation regime are derived respectively, and the normal dynamic stiffness model of the joint interfaces was established. At the same time, the relationship between the dynamic stiffness and the static stiffness of the joint interfaces was established. The analysis results show that, the dynamic stiffness of the joint was approximately equal to the static stiffness when the excitation frequency was much smaller than the natural frequency, and the dynamic stiffness was much larger than the static stiffness when the excitation frequency is much larger than the natural frequency, there also existed a resonant frequency that minimizes the dynamic stiffness.
Behavior of combined fly ash/GBFS-based geopolymer concrete after exposed to elevated temperature
Authors: Junru Ren , Huiguo Chen , Ruixi Dai , Tao Sun 
Published: June 2019

Abstract
Geopolymer is an emerging cementitious material characterized by better mechanical performance and more environmentally sustainable properties than ordinary Portland cement (OPC). Previous work mainly highlighted thermal behavior of metakaolin or fly ash-based geopolymers. This paper provides experimental data of geopolymer concrete manufactured with granulated blast furnace slag (GBFS) and fly ash after high temperature exposures of 400°C, 600°C, 800°C and 1 000°C in terms of ISO834. Residual compressive strength and splitting strength, as well as the effects of standing time were examined and compared with equivalent OPC concrete findings. The results revealed that both kinds of strength improved about 14% and 9% after being exposed to 400°C, and the reduction was less than OPC concrete. Additionally, the residual compressive strength after different exposures evolved variously with prolonging of standing time. On the basis of the results, the empirical equations of residual compressive strength and splitting strength of GC are established.
Finite Element Study on Mechanical Performances of Multi-Span Metal Faced Sandwich Panels under Temperature Actions
Authors: Tang Zhirong , Zha Xiaoxiong , Wang Baolin 
Published: June 2019

Abstract
Metal faced sandwich panel is composed of two relatively high strength metal faces and a relatively thick and lightweight insulated core. Under the continuous action of temperature such as strong sunlight, the multi-span metal faced sandwich panels can be destroyed. In this paper, the finite element (FE) software ABAQUS was used to study the stress and deformation of these sandwich panels under temperature action. The FE results show that the compressive stress in the mid-span region of the metal panel is larger and it gradually decreased from the middle to the two sides. The deformation at the centre of side span of sandwich panels is larger. The support constraints at the bottom of the sandwich panel have a great influence on the temperature stress. The fixed sandwich panel is more likely to occur wrinkle failure than the hinged one. To reduce the effects of temperature, two effective methods are proposed. The method increasing the density of the core material can increase the buckling stress and improve the bearing capacity against temperature action. The other method reducing the length of each segment of the sandwich panel can effectively release the temperature stress and reduce the negative effects of temperature.
Study on the Influence of the Height of Steel Beam on Creep Effects of Composite Beams
Authors: Zhang Shengping , Chen Xu , Lai Yingliang 
Published: June 2019

Abstract
The height of steel beam is an important parameter in the disign of structure. The effects of increasing the steel height of composite beam are quiet different from that of the pure steel beam because of composite and creep effects. To reveal the influences of this critical prarameter Rüsch constitutive equation of creep is used to obtain the exact results. With the increase of the steel height and after a limiting value is reached, the rate of the increase of the whole section stiffness becomes smaller, the rate of the increase of the compression zone of steel web becomes larger, yet the axial force and redistributed moment of concrete slab become almost constant. The deflection increases almost linearly and keeps a large slope with the increase of the steel height. Local buckling risk of the web must be considered.
Research on Information Integration of Construction Project Management Based on BIM
Authors: Gao Xiong , Wu Yansheng , Li Yan 
Published: June 2019

Abstract
The application of BIM play a crucial role to improve the current situation, and it has attracted increasingly attention from ACE (Architecture, Engineering, and Construction) industry participants, which improves the quality of project management and the ability of processing, integration and sharing information. The paper puts forward the framework of information integrated management mode based on BIM technology generally and based on the conceptual model of integrated information management system.The work still needed to complete is to develop BIM platform of integrated information management system based on Cloud technology and Internet of things at the later stage.
Experimental Study on Flexural Behavior of RC Beams Strengthened by External Prestressing
Authors: Cheng Yinglei , Xu Xinsheng 
Published: June 2019

Abstract
The efficient external prestressing reinforcement technology has the characteristics of simple construction, clear force transmission and convenient changing of cables, and has become a hot spot in the research of concrete structure reinforcement. In this paper, the external prestressed steel members are taken as the research object, and the two test beams are subjected to two-point loading test. The load-deflection curve is drawn. The ultimate bearing capacity, crack morphology and deflection of bending reinforced RC beams adopted external prestressing technology were compared and evaluated based on the experimental and theory analyzation. The experimental results show that the efficient external prestressing reinforcement technology can significantly improve the performance of concrete members and can be applied to structural reinforcement.
Second-order Effect Finite Element Analysis of Stainless Steel Frame Structure
Authors: Liao Rensheng , Zhang Zheng 
Published: June 2019

Abstract
Stainless steel has strong corrosion resistance and durability, which ensures the structural safety and durability, and has a good application prospect. Experiments on stainless steel have shown that the stress-strain nonlinearity of stainless steel is remarkable, which is different from that of ordinary steel. At present, the technical specifications for stainless steel structures do not specify the analysis of the internal force of stainless steel frames. By comparing the design specifications of steel structures and using finite element analysis method to analyze the internal forces of stainless steel frames, it is concluded that the approximate second-order analysis method in the design specifications of stainless steel frames can not be used, and the second-order analysis of internal forces of stainless steel frames should be carried out in consideration of material nonlinearity.
Identification of flowers of Musa nana Lour., flowers of Musa basjoo Sieb. et Zucc and flowers of Musa balbisiana Colla by HPLC fingerprinting
Authors: Zhang Lingling , Liang Yuqing , Zhang Peng , Yang Liubo , Li Xiaofen , Wang Xiangpei , Wu Hongmei 
Published: June 2019

Abstract
Objective: HPLC fingerprint identification method of flowers of Musa nana Lour., flowers of Musa basjoo Sieb. et Zucc and flowers of Musa balbisiana Colla were established, and the chromatogram similarities difference of three kinds of flowers were compared, in order to provide reference for variety identification, resource development and utilization of flowers of Musaceae medicinal materials. Methods: The separation was performed on a Diamonsil C18 column (4.6mm×250mm, 5μm) at 30°C. A binary gradient elution system was composed of acetonitrile and water containing 0.05% phosphoric acid and the flow rate was 0.8mL/min. The detection wavelength was 280nm. The HPLC fingerprint of 17 batches of flowers of Musaceae medicinal materials were determined and the similarities were evaluated. Results: The experimental results showed that the samples from flowers of same varieties showed high similarities, and had more common peaks. Flowers of Musa nana Lour., are compared with flowers of Musa basjoo Sieb. et Zuccr and flowers of Musa balbisiana Colla, whose similarities were less than 0.430 with few common peaks. However, the comparison between flowers of Musa basjoo Sieb. et Zuccr and flowers of Musa balbisiana Colla showed high similarities with more common peaks. The similarities of 17 batches of flowers of Musaceae medicinal materials were between 0.187 and 0.984 with few common peaks, indicating the significant difference of three kinds of flowers. Conclusion: The proposed method is simple, highly reproducible and suitable for the identification of flowers of Musaceae medicinal materials.
Research on the Theory and System for Testing Thermal Conductivity of Materials
Authors: Wang Chunyu , Yang Shifeng , Liu Chunqia 
Published: June 2019

Abstract
Thermal conductivity is one of important indexes of material’s quality evaluation. This material’s thermal conductivity detection system was designed and made based on the least square support vector machine algorithm. The system hardware was made mainly by microcontroller ATmega64, the temperature detection circuit and heating and refrigeration circuit. The system software was based on virtual instrument development platform of Labwindows/CVI and the least square support vector machine algorithm, which has data collection and processing, and the results display and control functions. Application shows that this system has advantages of reliable operation, precise temperature control and high thermal conductivity detection accuracy.
Establishment of a New Analysis Method for Trace Nitrogen Trifluoride in Helium detection by Gas Chromatography
Authors: Yin Qiang , Chen Ling , Ye Lifang , Jia Xiangrui , Mao Yuanwen , Zhou Yang , Zhou Jinyan , Huang Yanjie 
Published: June 2019

Abstract
In this experiment, a method for the determination of trace nitrogen trifluoride in helium (NF3/He) by gas chromatography (GC) was established. First, a series of NF3/He gas standard substance with accurate concentration was prepared by gravimetric method. And then, we had analyzed for the trace nitrogen and oxygen impurities in NF3, and the specific property experiment was used to verify that the impurity did not affect the measured value of the component. However, the analytical calibration curve of NF3 was nonlinear in the concentration range from 1 to 1000 μmol⋅mol−1. Nonlinear curves were transformed into linear curves by a linear power method, and the formula for the uncertainty of the fitting curve was calculated. Moreover, the consistency and uncertainty of the blind test results were evaluated. The results show that the method has high precision; the nitrogen or oxygen impurity has no effect on the specificity of the method; consistentcy of blind sample test result is well. Furthermore, it may be an ideal method for the research on the trace NF3 in helium.
Numerical simulation of elimination of white smoke in coal-fired power plants with WFGD system
Authors: Zhang Yixue , Liu Junyu , Luan Tao 
Published: June 2019

Abstract
White smoke discharged from chimney in coal-fired power plants always includes residual sulfide which can cause corrosive damage to buildings and environment around. In most coal-fired power plants, there are three major measures to eliminate white smoke: direct heating, condensing and heating, mixing with dry flue gas at high temperature. Main studies on white smoke elimination treat diffusion process as simple mixing of smoke and atmosphere, which has large deviation from reality. By 3D-modeling and numerical simulation, accurate data of white smoke elimination process is obtained. Simulation results indicate that humidity and temperature of atmosphere as well as smoke gas temperature are influential factors to the formation of white smoke. A fitting formula of atmosphere temperature, smoke gas discharge temperature and humidity has analyzed from simulation results, which provides exact data reference for practical white smoke elimination in coal-fired power plants.
Research on Operation Optimization of Integrated Energy System
Authors: Niu Honghai , Yu Fan , Li Bing , Chen Jun 
Published: June 2019

Abstract
The increasingly severe energy-saving situation and the need for sustainable development have brought the construction of integrated energy systems to a new level. The integrated energy system integrates multiple energy systems such as power supply, heating supply, and cooling supply. It is an inevitable trend in the development of modern energy systems to fully utilize the energy-saving potential of integrated energy systems through multi-energy complementary coordination and optimization. In this paper, an integrated energy system optimization scheduling model including a combined cooling, heating and power unit(CCHP) is proposed, and the optimal operation strategy of the integrated energy system under multi-season load demand is studied. The research results show that the integrated energy system can meet the requirements of energy security, stability and efficient supply under different seasonal conditions, and can significantly reduce energy operation costs.
Luminescent properties of a novel green phosphor CePO4-6LaPO4:Tb3+
Authors: Liu Ru , Wang Xigui 
Published: June 2019

Abstract
6LaPO4-CePO4:Tb3+ phosphors were synthesized by coprecipitation-high temperature solid phase methods. The structure and luminescence properties of phosphors were tested and analyzed by XRD, IR and fluorescence spectroscopy. The XRD pattern showed that the phosphors were LaPO4 and CePO4 of monoclinic; the FT-IR spectrum showed the same results as the XRD results; the fluorescence spectrum showed that the phosphors emitted green light at 544 nm, which corresponded to the transitions 5D4-7F5 of Tb3+.
A Geometry Elements Based Speed Prediction Model for Interchange Ramps of Mountainous Motorways
Authors: Jun Xie Hua Chai 
Published: June 2019

Abstract
The geometric design of motorways in the mountainous area is the top priority of the interchange planning and design. Reasonable ramp geometric design can not only reduce the cost and difficulties of construction of the interchange, but also improve the driving conditions, ensure traffic safety and improve the comfort of driving. Based on the development of foreign geometric alignment design practice, this paper analyze the continuous travel performance of vehicles on mountainous interchange ramps, and then proposes a highway geometric elements design method based on operating speed for practitioners to predict operating speed on ramps. The method will allow the auditors and the designers to proceed operating speed prediction for varied vehicle types for mountainous interchange ramps, which is also expected to give the auditors a good way to evaluate the consistency between driver’s expectation and the geometric design of the ramps.
Research on Performance Evaluation in PPPs in Sewage Treatment
Authors: Jiaoyue Long , Chuan Chen , Yan Tengteng , Yan Ziju , Zhang Muqian 
Published: June 2019

Abstract
Reasonable performance evaluation is one of the critical successful factors of PPP practices. For the sewage treatment PPP projects, the performance evaluation of "Emphasis on construction, neglect operation" has not been effectively improved. The value-for-money effect was lower than expected. Based on this background, this paper intends to take the XX Sewage Treatment PPP project as the research object, which will focuses on the analysis on the system of performance evaluation and summarize present problems of the system, then redesigns the performance evaluation system. At last, this paper measures the redesigned system, and provides some suggestions that contribute to the design performance evaluation system in PPP projects in sewage treatment.
Electrochemical impedance spectroscopy characteristics of steel corrosion in seawater sea-sand concrete
Authors: Wang Wei , Qian Liang , Zhang Yu , Zhang Yong-sheng 
Published: June 2019

Abstract
In this paper, the electrochemical mechanism and regularity of corrosion of steel bars in seawater sea-sand concrete under different chloride ion erosion styles are studied. Electrochemical impedance spectroscopy (EIS) was used to electrochemically test of steel bars in seawater sea-sand concrete (SSC). By means of analyzing the AC impedance spectra of the steel bars in specimens under two conditions, the conclusions can be gotten that in the EIS diagram of the steel bar in the rust state, the added capacitance arc in medium frequency range is related to pitting corrosion of the steel surface; The chloride ion carried by the aggregate and water decreased the concrete resistivity and transfer resistance of rebar and the anodic oxidation was easier to be carried out. In the equivalent circuit model, the constant phase element (CPE) is taken to replace the capacitor simulation in the equivalent circuit in order to simulate charge and discharge behavior of the electric double layer.
Simultaneous determination of multiple elements of tea garden soil using inductively coupled plasma mass spectrometry
Authors: Gan Z T , Yao T , She X S , Zhang P Q , Wang S Q , Wang Y , Tan Y Y , Qi N 
Published: June 2019

Abstract
Established a method of simultaneous determination of multiple elements of tea garden soil, the inductively coupled plasma mass spectrometry (ICP-MS) was used to test. The soil samples were decomposed by the fully automatic microwave with hydrogen nitrate (HNO3) and hydrofluoric acid (HF). The kinetic energy discrimination (KED) mode, the correction equation and the internal standard method were adopted to eliminate matrix effect interference within the testing process by ICP-MS. Moreover, contents of twenty-six soil elements were calculated with the corresponding standard curve at different content levels of standard solution. The results indicated that the curves of twenty-six elements which the contents were in the range of 0∼200μg/L were all approximately linear with correlation coefficients (R
2)> 0.990. The ranges of the limits of detection (LOD), the limits of quantification (LOQ) and the average recoveries (AR) of twenty-six soil elements were 0.0038∼3.6198μg/L, 0.0127∼12.0660μg/L and 84.04 %∼121 %, respectively, and the relative standard deviations (RSDs) were less than 7 %. The RSDs of standard substances of soil composition analysis were all < 5 % with ICP-MS in our experiments.