bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research progress of anti-penetration yaw technology for concrete protective structures
Authors: Zhang Wei , Di Baojun , Song Dianyi 
Published: March 2020

Abstract
Concrete protective structure is an important part of national defense engineering. It is of great significance to study its development status and penetration mechanism. This article summarizes the recent research status of concrete protection yaw technology, and summarizes the existing yaw technology by distinguishing materials and structural asymmetry. The anti-penetration and yaw mechanism of the protective structure is summarized: The first is to analyze the effects of warhead shape and material, the incident state of the projectile, the configuration of the reinforcement and the aggregate parameters on the resistance to the penetration and yaw. The second is angle of attack effect and contact theory; the third is to analyze the role of numerical simulation in the research of yaw technology; and put forward suggestions for future research work.
Comparison of soil classification from CPTU method and lab method in railway engineering
Authors: Wang Junpeng , Wang Bingkang 
Published: March 2020

Abstract
This article gives a engineering case of CPTU method and laboratory method in soil classification in railway subgrade engineering. In China, soil classification in railway subgrade engineering is often obtained through the traditional laboratory test. With in-situ tests developed in China, CPTU test is used widely in stratigraphy for soft deposit in railway subgrade survey and the National Railway Administration code based on CPTU test is also established. A study is made with a engineering case of subgrade. Two methods are applied in identifying soil strata respectively and differences of them are also discussed.
Yushulin Oilfield CO2- Comparison of minimum miscibility pressure test results for crude oil system
Authors: Liu Li , Pi Yanfu , Liu Yingjie , Ma Yingxue , Qiang Xiaojun , Liu Jinxin , Zhang Zhenxing 
Published: March 2020

Abstract
Miscible displacement of carbon dioxide in low permeability sandstone reservoirs can greatly improve oil recovery. The minimum miscible pressure is the starting point of miscible flooding. Its determination is very important for oilfield development. In this paper, the error analysis of the results measured by empirical formulas is carried out by the internationally accepted slim tube experiment method. Research results show that the minimum miscibility pressure obtained by slender tube displacement experiment is 22.12 MPa. The maximum, minimum and average miscibility pressures predicted by empirical formula method are 32.33 MPa, 7.85 MPa and 19.76 MPa, respectively. The relative error of the average minimum miscibility pressure predicted by all empirical formulas is 10.67%. The least relative error is the Yelling and Metcalfe correlation method, the relative error is 8.82%.
Energy-Saving Transformation Design of Existing Residential Buildings in Qinba Mountainous Areas
Authors: Zhou Shihang , Wang Qing , Zhu Yiyun 
Published: March 2020

Abstract
Through investigation, it is found that some existing buildings in Qinba Mountain have high energy consumption and poor indoor thermal comfort. The cost of demolishing and rebuilding is relatively high. Therefore, it is an important issue for the current urban residential development to study suitable local reconstruction strategies. Taking an old community in Hanzhong City of Qinba Mountain as an example, the field test of indoor and outdoor thermal environment in winter and summer was carried out for one house. The current situation of indoor thermal environment in Qinba mountain city buildings in winter and summer was analyzed. The environmental conditions are not ideal. This article uses DesignBuilder software to carry on the comprehensive transformation design to the wall of this existing building, the roof, the outer window and so on, and carries on the simulation analysis to its indoor thermal environment, the result shows that the enclosing structure has a greater influence on the thermal environment of the local building; the transformation model was obtained: 30mm EPS insulation layer was added to the wall, 50mm EPS insulation layer was installed on the roof, and plastic window (6+13A+6) was used as the outer window. After the renovation, the indoor temperature was increased by 11%-21%. This result can provide a certain theoretical reference for the energy-saving reconstruction of the existing residential houses in the Qinba Mountains.
Investigation on axial compressive stress-strain relationship of expanded fiber reinforced concrete
Authors: Wang Limin , Gao Peiwei , Tian Minghao , Tian Yilang , Zhong Jianjun 
Published: March 2020

Abstract
In order to improve the crack resistance and durability of concrete, basalt fiber and calcium-magnesium expansion agent was used to test the stress-strain relationship and full curve of axial expansion of fiber-expanded concrete with different factors through three-factor three-level orthogonal test. The study of the influence of structural parameters on the constitutive equation of fiber-expanded concrete with different contents and the relationship between the amount of fibers and expansion agents and the parameters of the constitutive equation of the axial compression stress-strain curve were determined. The results have shown that basalt fibers can significantly improve the toughness and ductility of concrete after failure, and the expansion agents can increase the ductility of concrete. When the fiber content is 1%, the expansion agent content is 7%, and the water-binder ratio is 0.42, the mechanical properties are the best. The constitutive parameter β of the rising section of the axial compressive stress-strain curve is 3.1 and the constitutive parameter β of the falling section is 0.6.
Research Progress on Internal Shear Connection of Double Steel Plate-concrete Composite Shear Wall
Authors: Zhang Zhuangnan , Shi Rui , Cheng Daye 
Published: March 2020

Abstract
A comprehensive analysis of three types internal shear connection of double steel plate-concrete composite shear walls is carried out. There are internally welded shear connectors, tension restraints shear connectors, and cavity-type. The analysis shows that these three types of shear connection forms have significant effects on the improvement of the seismic performance of shear walls, and can give full use of the properties of steel and concrete. Compared with the traditional shear wall, the steel plate concrete shear wall has been greatly improved and has a high level of industrialization. Aiming at these three types of shear connection forms, their deficiencies and future development directions were clarified.
Study on bending properties of recombinant bamboo and glued bamboo
Authors: Yang Zhipeng , Hu Yifan , Qiu Xiaoqing 
Published: March 2020

Abstract
Reorganized bamboo is a kind of bamboo composite material that reorganizes and reinforces bamboo. The glued bamboo is a composite material of bamboo fiber and phenolic glue with specific fiber arrangement and special processing. In this paper, the three-point bending test of reconstituted bamboo and glued bamboo was carried out, and the load-span deflection curve was obtained. The ultimate bearing capacity, flexural strength and elastic modulus were studied. The results show that the flexural strength of the recombinant bamboo is greater than that of the glued bamboo. However, the ductility of glued bamboo is better than that of recombinant bamboo.
Optimization design of basalt fiber reinforced stabilizer using response surface methodology
Authors: Liu Jinming , Ou Zhongwen , Mei Yong , Xing Yan , Xie Wei 
Published: March 2020

Abstract
This paper addresses the strength development of a basalt fiber reinforcedcement-based soil stabilizer.In order to develop eco-friendly high performance stabilizer, cementitious capillary crystalline waterproof material is used as alternative to partially replacesulphate aluminum cement.Driven by the purpose of achieving a high strengthperformancewithout impairing other desirable properties, calcium sulfate, basalt fiber and hydrophilicalumina suspension are selected as additives. By adopting the Response Surface Method,the combinedeffects of the three additives on the unconfined compressive strength of the stabilized soil are analyzed. The basalt fiber can constrain the growth of micro cracks and pores, and thus control their coalescence. Incorporating basalt fiber in combination with calcium sulfate and alumina suspension can not only increasethe strength and hardening of stabilized soil, but also improve other properties, especially for enhancingthe ability of cementing, andfor raising the fracture roughness, and therefore improve the durability.The microstructure changes as a consequence of stabilization process arecharacterized by the scanning electron microscope to analyze the origination of the high strength and durability of stabilized soil.The difference of mineral components between the untreated and stabilized soil samples is identified by the X-ray diffraction analysis.
Study on fluidity and strength of dredged sludge under water curing condition
Authors: Cao Yupeng , Zhang Jing , Zhang Shuai , Xu Guizhong , Xu Jianwen 
Published: March 2020

Abstract
Dredged sludge can be used in engineering by treating with flowing solidification method underwater, but the flow solidification characteristics of dredged sludge in underwater curing condition are not clear. The influence of initial water content, cement content and curing age on the fluidity and strength of solidified sludge was discussed through laboratory tests. The results show that the strength of solidified sludge under water curing situation increase linearly with cement content, decreases linearly with the initial water content, and increases logarithmically with the curing age. The relationship of unconfined compressive strength with liquid limit and initial water content for dredged sludge at 28 days curing age was proposed and verified, which provides an important basis for field application and strength prediction of flow solidification treatment.
Experimental behaviour of prefabricated pile-cap foundation under seismic loading
Authors: Gao Xian , Liao Feiyu , Zhou Jian , Zhang Kai , Huang Yuqi , Zhang Na 
Published: March 2020

Abstract
Precast building has attracted more and more interest of both researchers and engineers due to fast constructional speed and lower labour cost. In the past, the precast structure was generally used in the superstructure, such as load bearing frame, however, it is seldom applied in the substructure such as foundation. The paper thus proposed a type of pile-cap connection to fabricate the foundation of a substation. A series of tests on the prefabricated pile-cap connection using these connections were carried out under seismic loading. The failure mode and lateral load versus lateral displacement response of the tested specimens were experimentally investigated. The seismic behaviour of the precast foundation was compared with the behaviour of the corresponding cast-in-place foundation.
The Reservoir Characteristics Study on Yingshan Formation of the Ancient City-Lowuplift in Tarim Basin
Authors: Zhang Xiangjuan 
Published: March 2020

Abstract
The oil and gas exploration has been broken through in ordovician-Yingshan formation of the lower Paleozoic in ancient city-low uplift, in Tarim Basin. The preliminary study found that the rich oil and gas resources are mainly in karst cave of the dolomite reservoir. It is revealed that the exploration potential of the carbonate reservoir in Yingshan formation of the ordovician. So, the systematic evaluation and study on the carbonate reservoir for Yingshan formation of the Ordovician in ancient city-low uplift have been done. Based on the analysis of drilling, logging, well logging and testing data, it is found that: The reservoir spaces of carbonate reservoir of ancient city area are mainly intergranular pore, intergranular dissolved pore, karst cave, structural fracture and diagenetic fracture. The reservoir of Yingshan formation in the ancient city area is mainly crack pore-cave reservoir, secondly fracture type reservoir, and, the porosity for the third section of Yingshan formation is relative development with large thickness which should be the key exploration target. The dolomite reservoir of Yingshan formation has the characters of multi layers, thin layers vertically and the different comparison in horizon. The lower part of high-quality dolomite reservoir in Yingshan formation is an important exploration area of carbonate reservoir in ancient city-low uplift. The studies, on the micro and macro development characteristics of the carbonate reservoir of ordovician-Yingshan formation in ancient city-low uplift, provide ideas and guidance for the exploration and deployment of the carbonate reservoir.
A review of the research on the lateral force resistance of cold-formed shear wall
Authors: Zhang Zhuangnan , Wang Yiyue , Yang Juncai 
Published: March 2020

Abstract
In this paper, the research on the lateral force resistance of the existing cold-formed thin-walled steel shear wall was briefly summarized. The innovation of the new cold-formed thin-walled steel composite wall proposed in recent years and the improvement of the existing structure system were described. According to the research situation of home and abroad, the future prospect and development direction of this system were put forward.
Analysis of Wide Box Gird’s Shear-lag Effect Based on Energy Method in Single-Cable-plane Cable Stayed Bridge
Authors: Tan Donglian , Li Xing 
Published: March 2020

Abstract
Box beam shear lag effect Of single cable plane cable-stayed bridge under moment and axial force is analyzed. The Yellow River bridge in Jinan as an example, the formula of shear lag under dead load has been set up using the Energy variation method. It is convenient and practical. The theoretical calculation results are in good agreement with those obtained in the solid finite element model calculation. The results show that the shear lag effect of cable-stayed bridge of single cable plane with wide box girder is bigger. It should be highly valued in the design.
Study on the Influence of the Thickness of Column on Axial Compression Behavior of Cold-Formed Steel Composite Wall
Authors: Wang Chungang , Qu Jiaxin , Liu Hong 
Published: March 2020

Abstract
By changing the thickness of the column, the axial compression behavior of the one-side sheathed wall and the both-sides sheathed wall can be altered at different levels. Simulation and inspection of cold-formed thin-walled steel frame wall had been finished by using a finite element simulation software called ABAQUS, which was applied by test data from relevant literature. The axial carrying capacity of the sheathed wall was superior than the unsheathed wall, therefore, all models had been built and studied based on the one-side sheathed wall and both-sides similar sheathed wall. The analysis results proved that the axial compression behavior of the one-side sheathed wall and the both-sides sheathed wall could be increased substantially by adding the thickness of studs, and this change was more sensitive to the influence of the wall with one-side sheathed wall especially.
Study on seepage characteristics of tight sandstone reservoir
Authors: Zhao Yongfu , Liu Chen , Li Jing , Xie Yetong , Kong Xiangchao , Liu Xuliang 
Published: March 2020

Abstract
Seepage characteristics of reservoir rocks are important factors affecting the effect of tight oil and gas production. Therefore the pore structure of tight sandstone from Dong 6 well in 4 block of the central Dzungaria Basin were studied by mercury injection experiment, and the seepage characteristics of tight sandstone were comprehensively studied by stress sensitivity experiment. The results show that: the pore throat distribution of the tight sandstone in the study area is not uniform, but the sorting property is good. The pore throat which promotes the permeability is mainly distributed near the threshold pressure of mercury injection experiment. The stress sensitivity of tight sandstone is affected by stress state and pore structure. Stress sensitivity is negatively correlated with confining pressure, and permeability loss is negatively correlated with pore throat radius.
Research on Deterioration Model of Concrete Road in Cold Area
Authors: Jin Cheng , Zhang Yiduo 
Published: March 2020

Abstract
Based on the concrete damage data under the interaction of fatigue loads and freeze-thaw cycles, a concrete freeze-thaw cycle deterioration model and a fatigue damage deterioration model are established respectively. Based on the concrete fatigue damage deterioration model, a freeze-thaw influence factor is introduced, and a freeze-thaw The model of concrete degradation under fatigue and fatigue, and the relationship between freeze-thaw damage, fatigue damage and time are discussed separately, so as to study the remaining life of concrete roads.
Seismic Stability Analysis of Loess Landslide Based on Orthogonal Test
Authors: Zhao Juan , Mu Peng 
Published: March 2020

Abstract
A numerical model of a loess landslide is established by using numerical simulation method to simulate the stability of the loess landslide under earthquake load. The results show that the loess landslide is stable before the earthquake and instable under the earthquake. The horizontal displacement and shear strain increment of the front part of the sliding slope increase obviously under the earthquake. At the same time, the sensitivity analysis of the seismic stability of the loess landslide is carried out by using the orthogonal test design method. The results show that the seismic action is the second factor to the internal friction angle of the sliding zone soil. With the increase of the seismic intensity, the decrease trend of the stability coefficient increases.
Literature Review: How in-channel aquatic vegetation (IAV) affects hyporheic exchange (HE)
Authors: Ding Mengda , Wan Jingfang , Li Qiang , Tang Bing 
Published: March 2020

Abstract
Worldwide increasing demand of water both in both quantity and quality requires more understand of correlation of in-channel aquatic vegetation (IAV) with water purification, since IAV removal from waterways is commonly used for flowrate regulation. Hyporheic zone (HZ) is where is the connection area of surface runoff and subsurface flow, plays an important role of water self-purification. Based on current literatures, the mechanism of IAV impaction on HE is illustrated with a conceptual model that demonstrates 3 pathways, including biological approach, surface runoff approach and subsurface flow approach. Further experimental research is required due to the uncertainty and counteracts of the influence factors make its correlation ambiguous.
Analysis of influence factors and stability of concrete-filled steel tube arch bridge
Authors: Wang Jinzhi , Guo Junfeng 
Published: March 2020

Abstract
A structural calculation model of a fly-bird-type concrete-filled steel tube arch bridge was established by using large general finite element software. The stability of the bridge during construction and in each working condition was numerically simulated and analysed. Linear elasticity, geometric nonlinearity and material nonlinearity stability safety factors were calculated and their influences on the stability were compared. At the same time, the main influence factors of the fly-bird-type concrete-filled steel tube arch bridge stability are discussed, the influences of the wind bracing number, form and stiffness on the bridge stability are calculated and analysed, and the reasonable values or forms range and the structural stability influencing factors under different value conditions are studied.
The effect of rise-span ratio on the rigid-framed arch bridges
Authors: Guo Junfeng , Liu Yong 
Published: March 2020

Abstract
The rigid-framed arch structure is a popular bridge structure on medium and small span bridge such as flyover. Rise-span ratio affects the rigid-framed arch structure performance, in order to analyse the influence on the rigid-framed arch structure of different rise-span ratio, a calculation model of the rigid-framed arch structure on the basis of the project established using the large general finite element software, by adjusting the rise value to change the rise-span ratio, analysing and comparing the structural internal force and deformation condition of the rigid-framed arch in different rise-span ratio under the action of constant live load, temperature change, and foundation settlement. The influence of different rise-span ratio on the rigid-framed arch stress summarized.
Take-Off Trajectory Optimization of Tilt-rotor Aircraft Based on Direct Allocation Method
Authors: Gao Jiaxin , Zhang Qian , Chen Jiyang , Wang Xueyun 
Published: March 2020

Abstract
During the take-off stage, the tilt-rotor aircraft’s actuator is redundant and difficult to control. In order to take off more quickly and safety reach horizontal flight state with less power consumption, the take-off trajectory is necessary to be optimized. this paper introduces the direct allocation method to optimize the take-off trajectory of tilt-rotor aircraft. Firstly, the dynamic model of the take-off stage of the tilt-rotor aircraft is established. According to the actual flight conditions, the constraints and the optimization objective function of the take-off process are established. Then, the entire take-off process is divided into several segments according to time, and the continuous optimal control problem is discretized into a nonlinear programming problem by using the direct allocation method. The state and control variables at each segment point and midpoint are taken for optimization. and then the optimized variables are fitted by the third-order Simpson method. Finally, GPOPS toolbox in MATLAB was used to solve the nonlinear programming problem. The simulation results show that the optimized take-off trajectory can well meet the boundary constraints, and its solutions are stable.
Design of a Single Motor Special Hybrid Transmission
Authors: Han Ying 
Published: March 2020

Abstract
The development of electric vehicle power system has become an important technical route of energy conservation and emission reduction. Hybrid system based on engine optimization is becoming a feasible technology at present. The motor and transmission system was integrated for the dedicated hybrid gearbox at the beginning of the design, with obvious advantages in performance and cost. Therefore, this design method has been favored by many automobile companies. In this paper, a single-motor multi-gear hybrid scheme is introduced, which can realize the pure electric mode with two gears and hybrid mode with four gears. At the same time, this scheme also has the advantages of compact mechanism and low product cost.
Study on Shafting Calibration Technology of INS/CNS Integrated Navigation System
Authors: Zhao Wangyang , Song Gaoling , Zhou Lingfeng , Wang Kai , Liu Juzhong 
Published: March 2020

Abstract
As a high precision attitude measurement device, the INS/CNS integrated navigation system has error order of second and installation and calibration precision of minute. The calibration residue of installation error directly affects attitude determination and positioning precision. The paper discusses calibration method of sub-system installation error, and expounds calibration principles of INS/CNS integrated navigation system. According to overall technical solutions, this paper studies shafting calibration error transfer characteristics of INS/CNS integrated navigation system, and puts forward calibration solution for the system. It mainly analyzes impact of multiple error factors during system calibration such as installation error and measurement instrument error on the integrated system, models and analyzes countershaft inclination effect, coaxial error and zero position calibration, optimizes calibration method for the system and improves installation error calibration precision.