bluuebunny/crossref_metadata_2025_split huggingface dataset:
Three Forms of Minimum Flow Pore Throat Radius of Reservoir and Its Determination Method
Authors: Dai Jinyou , Lin Lixin 
Published: November 2020

Abstract
The minimum flow pore throat radius of the reservoir is an important indicator to characterize the seepage capacity of the reservoir pore throat. At present, the type of minimum flow pore radius is single, and there are few quantitative methods to determine it. To this end, through the analysis of the seepage capacity at different scale pores and the experimental method of mercury intrusion, the minimum flow pore throat radius and the determination method of the reservoir under the three seepage states of theoretical seepage, production seepage and filling seepage were studied and an example is applied. The analysis shows that the theoretical minimum flow pore throat radius corresponds to the lower limit of the capillary pore radius, and its size is related to the reservoir pore structure, which can be directly determined according to the mercury intrusion curve. The production minimum flow pore throat radius is the lower limit of the flowing pore radius of the reservoir. Its size is related to the reservoir pore structure and the production pressure difference. It can be determined by combining the mercury intrusion curve and the production pressure difference. The filling minimum flow pore throat radius is the lower limit of the filling pore radius. Its size is related to both the pore structure and the filling dynamics. It can be determined by combining the mercury intrusion curve and the original oil saturation. The above method was used to determine the minimum flow pore throat radius of Chang 63 reservoir in X Oilfield, Ordos Basin: the theoretical minimum flow pore throat radius is 0.015 μm, the production minimum flow pore throat radius is 0.017 μm, and the filling minimum flow pore throat radius is 0.085 μm. This study deepened the understanding of the minimum flow pore throat radius of the reservoir, and clarified the determination method of the minimum flow pore throat radius under different seepage states, which has reference significance for the calibration of the lower limit of the reservoir physical properties and the study of the reservoir utilization status.
Research on Civil Aircraft Structural Strength Material Performance Database Based on SpringBoot
Authors: He Minmin , Lv Shengli 
Published: November 2020

Abstract
According to various materials used in civil aircraft structural strength analysis, and applying software engineering ideas and object-oriented programming methods, a set of civil aircraft structural strength material performance database system based on SpringBoot was developed. The scope of the material library management and the input data standards are initially defined, through the analysis of civil aircraft material data, the metal, composite materials and layup data are classified and managed respectively. The material library used for finite element calculation and strength inspection also provides the export function of Nastran material card, it has a certain reference value for highly-managed civil aircraft depots, and can achieve work collaboration and improve work efficiency.
Effects of Hydrogen Diffusion on the Mechanical Properties of 2.25Cr1Mo0.25V Steel
Authors: Ge Jiahao , Yin Changdong , Wu Yiwen , Chen Jianjun 
Published: November 2020

Abstract
With the rapid development of hydrogen related equipment, how to ensure the reliable operation of these equipment has been an important research topic. 2.25Cr1Mo0.25V steel has high strength, good resistance to hydrogen corrosion and low cost. So it becomes one of most used material for high temperature and high pressure hydrogen systems. In this paper, the glycerine gas gathering experiment, micro hardness test and dynamic tensile experiment were conducted to study the changes of the mechanical properties of 2.25Cr1Mo0.25V steel under varying hydrogen charging time. The relationship between the hydrogen content and material properties were also discussed in detail.
3D Finite Element Analysis on Mechanical Behavior of Completion Tubing String for Extra-Deep High Temperature Gas Well
Authors: Liu Shuang , Shen Xinpu , Liu Junyan , Shen Guoxiao , Xu Qiang , You Dongdong 
Published: November 2020

Abstract
3D Finite Element model was built for analysis of mechanical behavior of tubular system. Factors of wellbore trajectory deviation and frictional contact behavior between tube and casing are considered in the model. Loads of packer setting, hydraulic fracturing, and gas production are included. Numerical solutions of stress and displacement distribution along the tubing are presented. Principal results are: 1) Displacement distribution along the whole length of tubing. 2) Distribution of axial stress and von Mises stress along the whole length of tubing. 3) Distribution of displacement and stress along the tubing section below expansion pipe, as well as frictional contact stress and frictional force in this section.
Effect of Fly Ash Content on Mechanical Properties of C80 High-Strength Concrete
Authors: Wu Yanli , Yin Suhua , Yang Wu , Dong Zhongqi 
Published: November 2020

Abstract
The changes of compressive strength and elastic modulus of concrete specimens with water-to-water ratio of 0.25, different content of fly ash (0%,20%,40%) and different ages (7d, 14d, 28d, 56d, 90d, and 120d) were studied. The results show that the amount of fly ash has a great influence on the compressive strength and the elastic modulus of the high-strength concrete.The compressive strength and elastic modulus of concrete with 0%, 20%and 40%content increase with age, but the compressive strength and elastic modulus decrease with the same age.
Effect of Cr on the Characteristic of Rust Layer Formed on Low Alloy Steels Immersed in Flowing 3.5%NaCl Solution
Authors: Yang Jianwei , Jiang Shan , Xu Feifan 
Published: November 2020

Abstract
The role of Cr concentrated inrust layer formed on Cr-containing steels was investigated. Corrosion products formed on these steels were analyzed by usingXPS, XRD,TEM, and Raman spectroscopy. The result indicates that amorphous Cr(OH)3 and (FeCr)3O4 formed on the Cr-containing steelsresulted in the formation of ultrafine corrosion-product particles and, consequently, a compact rust layer with low electronic conductivity. The Cr-containing rust layer servedmainly to inhibit the cathodic reaction of O2reduction, therebyimproving the flow-accelerated corrosionresistance of the low alloy steel.
Influence of Mixed Admixtures on Properties of Aeolian-sand Mortar
Authors: Guo Junhua , Yin Jiangtao , Yang Yi , Gao Chunyong 
Published: November 2020

Abstract
Using Aeolian sand as fine aggregate, adopt fixed lime sand ratio(1:2, Under the same consistency of mortar, the effect of single and compound doping of VAE and Water retaining agent(BS-W) on the working and physical properties of mortar was studied. Through the coMparison of its properties with blank mortar, to get the best content of admixture and the best proportion of compound admixture, to provide ideas for the development and research of high proportion or total replacement of aeolian sand mortar. The results show that: VAE and water retaining agent can obviously improve the workability, construction and water retaining performance of the slurry, but the physical and mechanical properties of mortar are reduced. When VAE content is 0.7%, BS-W content is 0.15%, the overall performance of mortar mixed with them is better, the flexural strength and compressive strength of mortar reached 4.78Mpa and 15.3Mpa respectively in 28d.
Synthesis of a New Flame Retardant Curing Agent with Phosphorus and Their Application to Epoxy Resins
Authors: Zhang Hongkun , Li Zan , Gong Xianyun , Wang Yang 
Published: November 2020

Abstract
The synthesis has been made on a new kind of phosphorus-containing compound 2-(phenylphosphoryl)-1,4-benzenediol, which is defined as PPBDO. Besides, it is utilized as a flame retardant and meanwhile a curing agent of epoxy resins (EP). The description of the chemical structure was made in virtue of Fourier transform infrared (FTIR) spectroscopy, 1H, together with 13C nuclear magnetic resonance. Investigation on the flame retardant properties, cured epoxy resins’ combusting performances, and thermal degradation behaviors in virtue of restricting oxygen index (LOI) and vertical burning tests (UL-94) as well as cone calorimeter and thermogravimetric analysis (TGA) experiments. According to the results from the cone tests, the PPBDO integration could efficiently decreased the combustion parameters featured by epoxy resins thermosets, including Heat release rate (HRR), Total heat release (THR), etc.. The TGA results displayed the PPBDO introduction managed to enhance epoxy resins matrix under the decomposition in advance, in comparison to the one pure EP, thus giving rise to a more concentration of char yield as well as thermal stability on the condition of high temperature.
Noise Reduction of Pipes under Sound Excitation via Various Attached Composite Structures
Authors: Song Yubao , Tang Daofeng , Zhang Hao , Guan Haoyi , Yang Benchuan 
Published: November 2020

Abstract
Pipe systems are broadly used in modern buildings and large transportation vehicles. The reduction of noise from pipes is one of the main concerns in their engineering applications. In this paper, the reduction of the radiated noise from pipes is studied experimentally using various attached structures. An experimental system is constructed in an anechoic room. Three types of attached structures are considered, including foam coatings, distributed absorbers and periodic absorbers. Via the comparison of basic pipe and pipes with different noise control designs, the reduction effects from the attached structures are compared and analysed. The results show that the radiated noise is effectively reduced by the foam coatings and distributed absorbers, especially, at most of the peaks of the noise. The distributed absorbers reduce the noise more on the whole. The low frequency peaks (below 200Hz) of the noise are reduced most by the periodic absorbers. Via the proper design of the structure types and corresponding parameters, the low frequency property, the broadband property and the reduction amplitude will be obviously enhanced.
The Effect of 4,4′-Methylene-bis-(2,6-di-tert-butylphenol) on Properties of Polyvinyl Alcohol/Chlorinated Polyethylene Composites
Authors: Jiang Sheng 
Published: November 2020

Abstract
A series of damping composites were prepared by adding 4,4′-Methylene-bis-(2,6-di-tert-butylphenol) (AO 4426) to a mixture of chlorinated polyethylene (CPE) and polyvinyl alcohol (PVA) with a mass ratio of 80:20. The damping properties and molecular structure of the composites were measured, characterized and analyzed by means of DMTA, DSC and FT-IR. The results show that there is only one damping peak in the PVA/CPE composite. However, a new damping peak appeared above the glass transition temperature of CPE with the addition of AO 4426 because of phase separation which caused by the aggregation of AO 4426 microcrystal under the action of hydroxyl hydrogen bonds. The corresponding temperature of this new damping peak is determined by glass transition temperature of AO 4426. Fourier infrared spectrum show aromatic ether and aromatic ester formed by dehydration between PVA and AO 4426.
Experimental Study on High Speed Two-dimensional Airfoil Based on Conventional High Speed Wind Tunnel Test
Authors: Wang Yi , Zhou Tao 
Published: November 2020

Abstract
The wind tunnel test of two-dimensional airfoil is usually carried out in the special wind tunnel for the airfoil test, but this kind of wind tunnel is usually small in size and low in Reynolds number. On the contrary, the conventional wind tunnel test is generally large in size, in which higher test Reynolds number can be obtained, but there is wall interference and other problems to overcome at the same time. In this study, the RAE2822 airfoil was used to carry out the wind tunnel test of high-speed two-dimensional airfoil in FL-3, which is a large-scale conventional high-speed wind tunnel and the section pressure coefficient was measured. Experimental data after calculation and correction comparing with the standard model data shows that it is practically possible to carry out airfoil wind tunnel test in conventional high-speed wind tunnel.
Augmented Reality in Maintenance Training for Military Equipment
Authors: Wang Wei , Lei Songgui , Liu Haiping , Li Taojin , Qu Jue , Qiu Ang 
Published: November 2020

Abstract
After more than 20 years of development, augmented reality technology has shown a strong development momentum, successfully applied in civil and military fields. And augmented reality maintenance system is one of the most typical application. This paper introduces the present situation of augmented reality maintenance system, illustrates the structure of a typical system, discuss key technologies of augmented reality maintenance, and investigates the insufficiencies of it in military equipment maintenance according to the contemporary condition. Eventually, this paper indicates the potential development tendency of the augmented reality military equipment maintenance system in the future.
Analysis of Spray Uniformity of Sprayers Based on Deep Belief Network
Authors: Li Shujiang , Guo Aijing , Li Maoyuan 
Published: November 2020

Abstract
Improving spray quality has a important practical significance for controlling the drift of harmful substances, increasing the effective utilization rate of pesticides and reducing environmental pollution. The influence of factors on spray quality is analyzed, and the nozzle wear is regarded as one of the influencing factors for the first time in this paper. It also constructs the relationship between spray distribution uniformity and influencing factors Model by proposes a soft measurement method based on deep belief network. Besides, when the distribution coefficient of variation and another influencing factors is given, the pressure value corresponding to them can get by neural network inverse modeling method, And the pressure can be used as the controlled variable in the spraying process. Compared to BP, the DBN model has stronger nonlinear mapping capabilities, higher prediction accuracy, and high practical value.
Research on High-rise Building Energy Saving Based on Data Fusion Model
Authors: Zhenwei Chen , Zijing Yang 
Published: November 2020

Abstract
With the economic development, high-rise building projects are popularized in more real estate development. The different electricity types of high-rise buildings are separately predicted in the paper to better discover the laws of each electricity type, which is more accurate than using only the total power consumption to make predictions, so that the algorithm will have stronger nonlinear fitting ability. Moreover, by using optimized particle swarm optimization algorithm to solve the fusion model parameters among multiple types of data, the parameters of the WLSSVM model are optimized to find the optimal combination of parameters, which effectively improves the prediction accuracy of the model and contributes to the energy saving and emission reduction of high-rise buildings.
Landscape evaluation of urban parks based on SBE and AHP: a case study of Kunming City
Authors: Shi Ying , Lv Dongpeng , He Jiang 
Published: November 2020

Abstract
The evaluation criteria of traditional urban park landscape evaluation methods are mostly flood control effect and commercial demand, and the index evaluation is not comprehensive. Therefore, taking Kunming as an example, this paper introduces SBE method and AHP method to evaluate urban park landscape. This paper analyzes the evaluation methods of urban landscape and urban park landscape at home and abroad, and selects infrastructure, landscape aesthetic degree, natural ecology and social culture as evaluation indexes of urban park landscape. The park landscape evaluation system of Kunming city was established, the plant landscape evaluation index was set up, and the landscape characteristics of urban park were classified. The comprehensive judgment matrix of urban park landscape evaluation is constructed to complete the comprehensive evaluation of urban park landscape. The results show that this method can evaluate the park landscape of Kunming in all aspects, and the accuracy and rationality of the evaluation are significantly improved in the actual application process.
Analysis of internal force and displacement of foundation pit pile anchor supporting structure based on soil frost heaving
Authors: Shi Dongmei , Li Yuanxun , Gao Xinya , Li Shuanghao , Xiang Tian 
Published: November 2020

Abstract
In order to study the influence of soil frost heaving on the internal force and displacement of foundation pit supporting structure in seasonal frozen soil area in Northwest China, the field test of pile anchor supporting structure for deep foundation pit is carried out to monitor the change of internal force and displacement of supporting pile in winter. The interaction relationship between soil frost heaving and internal force and displacement of supporting pile is analyzed combined with temperature change conditions. The results show that: Under the condition of natural frost heaving in winter, the frost heaving effect is the most significant at 0.5 m of the upper part of the supporting pile, and the reinforcement stress value on both sides of the pile body is the largest. The change rate of bending moment of supporting pile above 3.25m is higher than that of the embedded section and the maximum bending moment is at 0.5m, while the blot has a certain constraint on the bending moment deformation. The displacement of supporting pile increases in proportion to the freezing time, and the final increase is 157.7% of the initial value. It can be seen that soil frost heaving has great influence on the internal force and deformation of the upper structure of the retaining pile. The research results can provide reference for the construction of foundation pit support engineering in similar areas in winter.
Design Method and Finite Element Analysis of Prefabricated Steel-concrete Composite Lattice Column
Authors: Fu Xiaofan , Peng Xiaotong , Zhang Xu , Lin Chen 
Published: November 2020

Abstract
In order to solve the problem of exposed column, a new prefabricated steel-concrete composite lattice column (SCLC) in residential building was proposed. The SCLC consists of concrete filled steel tubes, which are connected by channel steel and lace plates. The finite element simulations of six infilled SCLC with different cross-section (L-shaped, T-shaped and X-shaped) were performed under monotonic loading by using ABAQUS, in which the carrying capacity, ductility, stiffness and energy dissipation were analysed. The results indicate that the infilled concrete can improve the strength and stiffness of SCLC, while the ductility decreases slightly. X-shaped SCLC has the best carrying capacity and poor ductility. The SCLC with T-shaped has the best comprehensive performance.
Study of experiment in field for long-span cable-stayed bridge
Authors: Guo Kun , Liang Junwei , Pu Guangning , Han Xin 
Published: November 2020

Abstract
In order to provide the reasonable optimization measures for the construction of long-span steel bridge deck pavement in the alpine area, the actual pavement effect under the real load is studied by simulation simulation with the finite element analysis software relying on the construction of the bridge deck of No.1 Bridge of Haidong Avenue, Ledu District, Haidong city. Through different load positions and loading methods, the control load loading points are determined, and the parameterized analysis is carried out for the elastic modulus, thickness and temperature difference of the pavement, and finally the structural parameters of the pavement suitable for the bridge are obtained; the experimental analysis results show that the theoretical calculation idea adopted is feasible, and the measured value is within the expected range. It can be seen that the construction optimization measures and suggestions are of great significance to the construction of steel bridge deck pavement in the high cold area.
Indoor model test of red clay slope under evaporation-rainfall
Authors: Chen Kaisheng , Wang Qinqin , Luo Dipu , Zhou Bo , Zhang Kun 
Published: November 2020

Abstract
Evaporation-rainfall is one of the main causes of red clay slope failure. In order to explore the evolution law and mechanism of red clay slope failure under evaporation-rainfall, this paper takes Guizhou red clay as the research object, establishes slope model in laboratory, and analyzes the failure characteristics, failure mode and failure mechanism of red clay slope under evaporation-rainfall. The test results show that the failure mode of red clay slope under evaporation-rainfall is: splash erosion and surface erosion stage → crack development stage → gully formation stage → gully development stage → local collapse stage → slope foot collapse stage. During the test, there is no obvious sliding surface on the slope. In the process of rainfall, the free water inside the slope converges to the foot of the slope under the action of gravity, which results in the maximum moisture content at the foot of the slope, and the strength of the soil decreases sharply. The local collapse occurs at the foot of the slope first. When several collapses are connected and the structure of the slope foot cannot support the weight of the upper shallow soil, the collapse occurs to the middle and upper part of the slope exhibition.
Study of the New Neighborhood Units in the Chinese Context
Authors: Ye Xincheng , Zhang Qi 
Published: November 2020

Abstract
New Urbanism proposed a TND (traditional neighborhood development) model and a series of laws of form, to deal with this issue from the urban typology levels to face the suburbanization of America. Current Chinese urban environment is becoming more sophisticated, to deal with all kinds of urban problems by blindly applying New Urbanism law is impossible. This paper proposes a new unit of neighborhood paradigm based on the way of life under the Chinese context, trying to experience the type of development approach, from the topological level to deal with urban Chinese context.
Investigation on applied automatic monitoring of deep foundation-pit projects
Authors: Hu Xiaolong , Huang Zhixing , Geng Pei 
Published: November 2020

Abstract
A deep foundation-pit project in Shenzhen is studied for the application of automatic monitoring in the construction of deep foundation pit. Based on the analysis results of a three-dimensional finite element model implements with the MADIS GTS software, nine monitoring items and 59 automatic monitoring points are arranged in the key areas of the foundation pit, to monitor in real time the pit-top horizontal displacement, pit-top settlement, column pile settlement, groundwater level, horizontal displacement of deep layer, axial force in the supporting structure, anchor-cable stress, and settlement and cracks of the surrounding buildings. Based on the results of automatic monitoring, the patterns of variation are discussed of the data of the monitored items, and the accuracy and data stability are analyzed of the monitoring sensors such as measuring robot, hydrostatic level and crack gauge. The results show that: the key areas of automatic monitoring determined by the three-dimensional finite element model are in good agreement with the actual situation on site; Under the given conditions, the sensors such as measuring robot, hydrostatic level and crack gauge can meet the required monitoring accuracy, and the measured data has high stability; in addition, the sensor value is closely related to the ambient temperature. These results can provide reference for similar projects.