bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear Conductivity of ZnO Materails Induced by X Ray
Authors: Yang Xiaoning , Liu Yuming , Wang Zhihao , Li Yu , Wang Jinghu , Zhang Yongtai 
Published: January 2020

Abstract
Due to high energy electron radiation in space, Spacecraft internal charging will occur, which will cause deep dielectric electrostatic discharge and cause the most serious anomalies, that is, those that have resulted in the loss of mission. Because spacecraft internal charging is accompanied with X-ray bremsstrahlung, it is possible to mitigate inner dielectric electrostatic discharge by using nonlinear conductivity material induced by X-ray radiation. It shows that the conductivity of ZnO materials increases with the increase of X-ray radiation dose rate. At low X-ray radiation dose rate, the conductivity of ZnO increases linearly with the increase of X-ray dose rate. At high X-ray radiation dose rate, the conductivity of ZnO is saturated gradually. The conductivity of ZnO with high original resistivity varies more widely with the dose rate of X-ray, which is more suitable for spacecraft internal charging protection.
Bearing mechanism and bearing capacity analysis of bidirectional crimping uplift pile
Authors: Wang Haichao , Zhang Qiuyue , Fang Zhou , Zhang Zhuang 
Published: January 2020

Abstract
Through the analysis of the design, mechanism of action and mechanics principle of bidirectional crimping uplift pile, the scientificalness and feasibility of method are further expounded. The basic concept, basic principle and method of the secondary structure function design are given, Emphasis is placed on the research and application of structural functions in the later stages of deformation to optimize structural design and the potential for structural play. The research shows that the compressive and pull-up bearing capacity of the bidirectional crimping uplift pile is not lower than that of the muti-plate-pile. Compared with the same volume of concrete square pile, the uplift capacity is increased by 170%; the construction process is more reasonable and extensive. Applicability, in the context of industrial building products, has significant economic benefits.
Creep rupture strength of F12 steel welded joint after long-term service
Authors: Zhang Zhongwen , Li Xinmei , Zhang Duqing , Du Baoshuai 
Published: January 2020

Abstract
Creep rupture strength of F12 steel welded joint which was used as the main steam pipe and serviced 165000 hours was investigated by using high temperature creep rupture testing. Microstructure analysis results show that the microstructure of F12 steel welded joint became embrittlement significantly after long-term service. The precipitates mainly consist of M23C6 carbide and Laves phase, and the amount of M23C6 phase is more, which precipitated along the grain boundaries in bulk or chainlike with larger size. At the same time, there are larger inclusions with directional distribution, in which these inclusions have poor bonding with substrate and easily become crack source during the process of high temperature creep. The high temperature enduring strength of welded joint of F12 steel decreased significantly, it is necessary to enhance the examination of the microstructure and life assessment of pipeline in the next overhaul period.
Analysis of Vehicle Dynamic Performance under MCAT Excitation
Authors: Huo Wenbiao , Yang Sheng , Wu Pingbo 
Published: January 2020

Abstract
In order to validate the running safety on track of railway vehicle, a numerical analysis is performed with a multi-body vehicle dynamics model built. Follow the vehicle-track interaction (VTI) evaluation declared in north America standard declared by Federal Railway Association (FRA), a Minimally Compliant Analytical Track (MCAT) worthiness analysis is employed. In this investigation, the analytical track geometry irregularities which consist of surface, vertical and short warp are defined. Then the running performances concerning the derailment safety of the vehicle is discussed by evaluating the wheel unloading and derailment coefficients. Vibration acceleration of the carbody is also monitored to evaluate the ride comfort. By changing the track irregularities MCAT, the impact of track wavelength, gauge and cant deficiency on the dynamic performance of the vehicle can be assed.
Performance Study on Acrylic Pressure-Sensitive Adhesive Modified with Metakaolin
Authors: Zhang Junhao , Zheng Xuntian , Ma Quanzhi 
Published: January 2020

Abstract
This paper takes butyl acrylate(BA) and 2-ethylhexyl acrylate(2-EHA) as the soft monomers, vinyl acetate(VAC) as the hard monomer of pressure-sensitive adhesive and acrylamide(AM) and acrylic acid(AA) as the raw materials of modified monomer to synthesize pressure-sensitive adhesive to carry out Fourier Transform Infrared Spectroscopy(FTIR)characterization. In order to satisfy some special requirements and improve its adhesive property, this paper uses metakaolin and metakaolin modified with silane couling agent KH570 to carry out mechanical blending with pressure-sensitive adhesive respectively and prepare composite acrylic pressure-sensitive adhesive. This paper tests the viscosity of composite pressure-sensitive adhesive with metakaolin and modified metakaolin. It is found that with the increase of doping content, the viscosity will be increased accordingly and the viscosity of composite pressure-sensitive adhesive with modified metakaolin has a larger growth. The adhesive property indicates that composite pressure-sensitive adhesive with KH570 modified metakaolin has an obviously better adhesive property than that with unmodified metakaolin, and when 0.8wt% of modified metakaolin is added, inorganic/organic composite acrylic pressuresensitive adhesive has the best comprehensive adhesive property.
Study on the Outburst Scheme of a Shallow Buried Bias Tunnel in Yunnan
Authors: Wang Jiaxian , Li Ke , Guo Hongyan , Cui Xiangyang 
Published: January 2020

Abstract
Improper construction of the tunnel entrance is likely to cause collapse and affect construction safety and damage the ecological environment. Aiming at the poor stability of surrounding rock at the exit position of Xiaoguanzhuang tunnel, on the basis of investigating the geology and driving scheme near the tunnel, the asymmetric distribution of axial force of cross-section structure under shallow eccentric pressure is obtained through numerical simulation, and the maximum axial force is applied at the left arch waist and right arch foot. According to the analysis results, the surrounding rock should be reinforced in time, and the import section should be dealt with in the design stage to ensure construction safety and efficiency, and provide reference for future construction.
Study on Key Construction Procedures of CRD Method for Re Shuitang No.3 Tunnel
Authors: Wang Zhongwei , Yang Ruihuai , Guo Hongyan , Li Ke 
Published: January 2020

Abstract
Controlling the critical construction steps of the CRD method plays an important role in ensuring construction and ensuring construction safety. When using the CRD method for the construction of the Re Shuitang No. 3 tunnel, through the numerical simulation of the initial support structure and the temporary support structure during the tunnel construction process, it is concluded that the left upper step, the upper right step and the temporary support structure are obviously stressed. Construction steps. According to the analysis results, the surrounding rock of the vault should be strengthened in advance, and the second lining structure should be applied after the surrounding rock is stabilized.
Influence of annealing temperature on photoelectronic properties and wettability of TiO2nanotube arrays
Authors: Yang Lei , Bao Yu , Li Chaoqian , Zhang Yajuan , Zhao luyao , Wang Zixiu , Sun Yiwen , Lin Minghuang 
Published: January 2020

AbstractTiO2nanotube arrays (TNs) were prepared by anodization of titanium foil and then annealed at different temperatures (300°C, 400°C, 500°C, 600°C, and 800°C). The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible spectroscopy (UV-Vis). Effect of annealing temperature on crystalline structures, morphology, photoelectronic properties, and wettability has been investigated. The results indicate that low temperature (below 500°C) has no obvious influence on surface morphology, while amorphous phase changes into anatase phase and rutile phase. The ultraviolet absorbance decreases while the visible light absorbance slightly increases with the increase of annealing temperature. At 500°C, the TNs show the highest photocurrent and maximum light-induced contact angle change, which are ascribed to their good crystallization, mixed crystal structure, and nanotubular structure.
New Method for Eliminating Background Noise in Characteristic Spectral Imaging
Authors: Xie Xiaoli , Wang Zheng , Wu Wuming , Zhao Chujun , Chang Shengli 
Published: January 2020

Abstract
We proposed a method to eliminate the background noise, which is based on subtraction of two different central wavelength filters according to the characteristic spectral imaging. In the experiment, the sodium yellow light with 589 nm wavelength is selected as the characteristic wavelength of spectral imaging experiment, and the visible light industrial camera was used to collect diffuse reflective wall images. Firstly, two narrow-band filters with a center wavelength of 589 nm and 579 nm are placed in front of the camera separately, and two images of the signal light containing the narrowband characteristic wavelength are acquired. Then, the surf algorithm is used to find the feature points of the two images, and the two images are matched, geometrically transformed and cropped to obtain images of the same size and the same angle. After the histogram matching, the background gray values in the two images are close, and the two images are subtracted, which can obtain an image with removed background noise. The experimental results show that this method can provide a simple, high-speed method to effectively eliminate the background noise of the characteristic spectrum.
Simultaneous Analysis on Phenolic Substance in Cloudy Apple Juice by HPLC
Authors: Zhu Danshi , Fu Hao , Shen Yusi , Cao Xuehui , Liu He 
Published: January 2020

Abstract
Phenolic substances are important bioactive substances in apple juice. The phenolic substance extraction methods in ‘Ralls’ cloudy apple juice and the simultaneously detected conditions using high-performance liquid chromatography (HPLC) were investigated. The results showed that the extraction method for mixed phenolic substance by ethyl acetate was better than that extraction for neutral phenols and acidic phenols respectively. Most phenolic substances in apple cloudy juice could be detected at 280 nm, and which was the primary detection wavelength for simultaneous analysis on phenolic substance by HPLC. Chlorogenic acid, epicatechin and gallic acid were the main phenolic substance in ‘Ralls’ apple juice. Quantitative analysis showed that the content of chlorogenic acid was the highest, and it was the characteristic phenolic substance in ‘Ralls’ apple juice.
Detection Performance of Single Pulse Photon Accumulation with Typical Emission Waveform
Authors: Hou A-Hui , Hu Yi-Hua , Zhao Nan-Xiang 
Published: January 2020

Abstract
Based on the theory of photon statistics, the cumulative detection probability model of mono-pulse echo is established. The influences of rectangular, Gaussian and triangular pulses on the photon detection performance are simulated, and it is analyzed the detection performances of three waveforms with different pulse widths. The results showed that the detection performance of rectangular pulse was slightly better than that of triangular pulse, and the detection performance of the Gaussian pulse was the worst. The variation of the pulse width of the three waveforms within a certain range had no effect on the detection performance.
Numerical Simulation of Flows Field Characteristics of High Altitude Liquid Rocket Exhaust Plume
Authors: Ye Qing , Liu Zunyang , Li Jie , Su Rongyuan 
Published: January 2020

Abstract
The simulation of flow field structures of high altitude liquid rocket exhaust plume is of great significance for infrared radiation caclution. Considering the flow field’s symmetry construction, half of the 2-D zone was chosen as the calculation zone. In order to reduce the amount of calculation, we had made an equivalent reduction of the calculation zone. By using the direct simulation Monte Carlo (DSMC) method, a solver was constructed to simulate the flow field structure of the 120km altitude liquid rocket exhaust plume. The simulation results show that the flow field of the high altitude liquid rocket exhaust plume has the following three characteristics: a. the whole flow field indeed contains continuous flow and rarefied flow; b. rarefied gas effect plays a significant role to form a recirculation zones that surpass the nozzle; c. Non-equilibrium effect is remarkable in shock wave region and the boundary layers.
Hot-wire Anemometer Based on Frosted Fiber Bragg Grating Coated with Silver Film
Authors: Yang Jing , Chen Xuke , Dong Xinyong 
Published: January 2020

Abstract
Hot-wire anemometer is proposed based on a frosted fiber Bragg grating (FBG) coated with silver film assisted by a coupler of lumbar-enlarged optical fiber taper. The silver film adhered to the surface of frosted FBG absorbs pumping light, which is coupled into the fiber cladding by the lumbar-enlarged taper to generate heat. A strong diffuse reflection occurs on the surface of frosted FBG, which increases absorption of light by silver film. Center wavelength of frosted FBG changes with velocity of airflow according to a relationship. Experimental results reveal that sensitivity is 5.3 pm/mW and the measurement range from 0 to 20.36 m/s.
The NOx of Grate-Fired Furnaces Reduction strategy
Authors: Yang Baibing , zhang Songsong 
Published: January 2020

Abstract
According to the operating characteristics of Coal Grate-Fired Furnaces, the causes of nitrogen oxides formation in Coal Grate-Fired Furnaces were analyzed, the measures to reduce nitrogen oxides emissions were introduced in principle, and according to the actual situation, the engineering measures for reducing nitrogen oxides in Coal Grate-Fired Furnaces were proposed.
Study on dynamic measurement of fouling thermal resistance in a boiler
Authors: Zou Kairan , Qiao Ning , Wang jiaoling , Si Rong 
Published: January 2020

Abstract
A fouling thermal resistance method is introduced, for evaluating water quality in real time through measuring fouling thermal resistance on heat transfer surface. A simple device as a boiler heat transfer model was designed for measuring the deposition of dirt by the fouling thermal resistance method. The change in the thermal resistance of the fouling was measured with regard to samples with different water quality. The temperature-time curves were plotted with respect to the measured data of various temperatures over the whole process of temperature rise and fall to examine the feasibility of the method in evaluating the thermal resistance of the fouling contributed by the hardness of the water, finding that the fitted curve can characterize the fouling deposition of high hardness water. It has been shown that this experimental device can be improved further in the hope of being applied in practical use.
Selection of typical wet desulfurization system and economic analysis of variable load operation for industrial coal-fired boilers
Authors: Li Ximei , Gao Jianmin , Liu Yinuo , Du Qian , Liu Xuemin , Qi Guoli 
Published: January 2020

Abstract
In this paper, the operation costs of wet flue gas desulfurization based on MgO, CaO and CaCO3 under basic, special and ultra-low emission limits are analyzed from the unit price of desulfurizer and electricity price. Guidance about desulfurizer selection in Liaoning Province under different electricity prices and different loads is given. The results show that the desulfurization cost of MgO is greatly affected by the desulfurizer price, while the CaCO3 is more sensitive to the fluctuation of electricity price, and the CaO is between the two. In Liaoning Province, the overall economy of CaCO3 is relatively poor in the whole range of electricity price, while CaO and MgO perform better. The former has obvious advantages at low electricity price, while the latter is preferred at high. With the emission standard becoming stricter, the dominant range of CaO is expanded. When the boiler load changes, the power consumption cost and desulfurizer cost also change accordingly under different emission requirements. When the electricity price of Liaoning Province is 0.8 RMB/kWh, no matter under which emission limit, the operation cost of MgO is always the lowest under the considered loads, followed by CaO, and the economy of CaCO3 is the worst.
Operation Performance and Economic Efficiency Analysis of Power Plant Boilers Ultra-low Emission Facilities
Authors: Wang Hai 
Published: January 2020

Abstract
In this paper, four units of a power plant are taken as the research object, and the air pollutant emission performance standards, equipment installed economic efficiency, operational economic efficiency and energy saving potential of four units using different technical methods for ultra-low emission transformation are analyzed. Take unit 4 as an example, the ultra-low emission operation cost is discussed. The results show that the operation performance, stability and reliability of some units of low-temperature economizer need to be improved; the K values of different ultra-low emission technology methods were between 7.6∼12kW/MW. The installation of a low temperature economizer allows the wet desulfurization facility to have a greater water saving capacity.
Numerical Study of Enhanced Heat Transfer of MicroChannel Heat Sink with Nanofluids
Authors: Hou Yan , Yang Jialin , Zhang Wenqi 
Published: January 2020

Abstract
The electronic devices on the circuit board of the navigation device have the defects of high power and difficulty in heat dissipation, thereby restricting their performance. In view of the above defects, this paper proposes a miniature water-cooled radiator with a trapezoidal cross-section spoiler arranged at equal intervals. The numerical simulation of the three-dimensional laminar flow and heat transfer is carried out to study the performance of the micro water-cooled heat sink. The effects of Reynolds numbers and the types of nanofluids on the heat transfer performance of microchannel heat sink are also investigated. The results show that when the Reynolds number ranges from 100 to 500, the existence of the spoiler column makes the heat dissipation effect of the microchannel heat sink significantly improved, and the friction coefficient decreases with the increment of the Reynolds number. With the increasing of the volume fraction in the nano-particles, the heat transfer performance of microchannel heat sink is also improved. The heat transfer performance of SiC nanofluids is better than that of TiO2 nanofluids under the same flow rate.
Study on combustion and nitrogen oxide emissions of gas boiler
Authors: Ji Yanyan , Zhang Songsong , Wang Kejian , Qi Guoli 
Published: January 2020

Abstract
In order to reduce the emission of nitrogen oxides in gas-fired boilers, the effects of excess air ratio and flue gas recirculation on nitrogen oxide emissions during natural gas combustion are studied by numerical calculation. By adding flue gas recirculation, the generation of nitrogen oxides is significantly reduced. When the flue gas recycling rate is 20%, the emission of nitrogen oxides is minimized to about 40 mg/m3.
Analysis of influence of peak regulation on life of once-through boiler
Authors: Liu En Ren , Zhao Yu Lan , Yan Qing , Li Yuan Yuan , Han Ying Kun , Meng Xiang Rong 
Published: January 2020

Abstract
In this paper, a 670 MW once-through boiler of a power plant is taken as the analysis object. The method of ANSYS numerical analysis is used to calculate the stress of the once-through boiler in different starting modes and different peaking depths. We calculate the life loss of different operating conditions according to the stress value, which provides reasonable suggestions for the life management of the once-through boiler during peak shaving, which can reduce the impact of peak shaving on boiler life.
Transient Evaporation Simulation of the Forced Circulation Hot Water Boiler
Authors: Bao Junjie , Wang Di , Liu Feng , Qu Zhiguo , Xu Hongtao 
Published: January 2020

Abstract
This paper presents a comprehensive analysis of the water vaporization in a hot water boiler system. The Computational Fluid Dynamics (CFD) technology was adopted to simulate the transient water evaporation in the boiler termed as DZL14-1.25/115/70-AⅡ under the assumption of extreme conditions such as the water pump failure. The results indicated that the average pressure in the pipeline increased from 0.57Mpa to 0.66Mpa (the setting pressure of the safety valve) within 1050s. The pressure increased rapidly with the time increase. The average temperature of hot water changed linearly with time, and the internal thermal deviation of the hot water pipeline in the boiler decreased with time. The internal vaporization phenomenon of the hot water boiler became significant under the extreme condition. The steam flowed upward and accumulated in the upper part of the boiler shell. At 1050s, the vapor volume fraction in the hot boiler was 1.05%, which indicated that the safety valve above the stream shell need to be opened in time after 1050s to ensure the safety of the boiler.
Numerical Study of High Performance Ablative Thermal Protect System by Adding Phase Change Material
Authors: Qiao Lei , Ji Ri-tian , Bai Jun-qiang , Wang Hui 
Published: January 2020

AbstractUnder extreme thermal environment, ablation process of thermal protection system is a key issue in atmospheric re-entry and hypersonic flight vehicles; it displays a strong coupling between ablation mass, velocity and heat transfer. This article presents a method for combining the ablating and melting process, building a right triangle carbon-carbon model for ablation mixed with octadecane phase change material to absorb the heat of combustion delaying the movement of burning interface. For the moving of boundary, it is treated by the modified Stefan model coupled with chemical reaction and thermal radiation at the front leading boundary. The governing equation of heat transfer considering the melting process of phase change material is given by referring the enthalpy method. The effect of volume ratio and aerodynamic heating on the ablation interface and net heat flux on the interface are investigated. Result shows that high volume ratio of the phase change material delays the movement of the interface, and decreases the net heat flux of the interface; on the other hand, high aerodynamic heat accelerates the movement of the interface and increases the interface net heat flux at a given time point. This study can give a rule on how the volume ratio of phase change material influence the ablative process quantitatively.
Numerical modelling of a counter-flow regenerative evaporative cooler based on modified effectiveness-NTU method
Authors: Duan Zhiyin , Wen Sikai , Wang Minghui , Li Junjun 
Published: January 2020

Abstract
This study develops a numerical model for a counter-flow regenerative evaporative cooler in Engineering Equation Solver environment by using modified effectiveness-NTU method. The overall performance of the counter-flow heat exchanger was predicted by varying inlet air temperature and humidity.