bluuebunny/crossref_metadata_2025_split huggingface dataset:
Clamp bending machine and annealed wire cutter for reinforced concrete columns
Authors: Marron J , Quispe G , Raymundo-Ibañez C , Perez Moises 
Published: February 2020

Abstract
This study developed a reinforced steel rod bending machine for rods with diameters of up to 8 mm and annealed wire cutter for up to 5 kg for replacing manual intervention required to bend rods in reinforced concrete columns. This study aims to reduce the physical effort that could lead to occupational diseases, such as tenosynovitis, bursitis, muscle disorders. Clamp manufacturing possesses great risk for workers, who are exposed to injuries while using different cutting devices, such as grinders and electric saws. They also face potential problems such as muscular fatigue due to the nonergonomic and repetitive work positions. The proposed machine features a mechanical dragging and bending systems and manual shears. Additionally, the proposed machine has been designed theoretically and its effectiveness has been assessed through simulations conducted using the SolidWorks CAD software. A bending machine prototype for producing clamps is developed and its machine productivity is measured. Using this machine, approximately 300 clamps can be bent per hour without possessing any risk to the worker.
Dynamics of phase transformation of Cu-Cr-Zr-Ag Alloy
Authors: Liang Dong , Mi Xujun , Peng Lijun , Xie Haofeng , Huang Guojie , Yang Zhen 
Published: February 2020

Abstract
Dynamic kinetic of phase transformation of Cu-Cr-Zr-Ag alloy has been studied according to the relationship between electrical conductivity and the volume fraction of phases during the aging. Based on above experiments, the Avrami empirical equation and electrical conductivity equation can be respectively identified at different aging treatment. S-curve of the dynamic kinetic during the aging process and C-curve of isothermal transformation for the Cu-Cr-Zr-Ag alloy are obtained.
Axial compression capacity calculation of slenderness CFST filled with DCLs
Authors: Zhang Huifeng , Bai Xue 
Published: February 2020

Abstract
The demolished concrete lumps (DCLs) has been demonstrated to replacement partial coarse aggregates when casting concrete. The experimental studied involved 12 Concrete-Filled Steel Tube (CFST) columns. Each columns diameter was 159mm, the length of specimens was 2000, 2200 and 2400 mm. The Diameter-to-thickness (D/t) ratio was 79, 53 and 40. The replacement ratio of FC by DCLs was 0, 20, 40 and 60%. The DCLs had slightly affect on the mechanical performances of slender CFST columns. the code CECS 28:2012 was used to calculate the bearing capacity of slender CFST columns filled with DCLs under axial compression
Mechanical behaviour of slenderness CFST filled with DCLs under axial compression
Authors: Zhang Huifeng , Bai Xue 
Published: February 2020

Abstract
The demolished concrete lumps (DCLs) has been demonstrated to replacement partial coarse aggregates when casting concrete. The experimental studied involved 12 CFST columns. Each columns diameter was 159mm, the length of specimens was 2000, 2200 and 2400 mm. The Diameter-to-thickness (D/t) ratio was 79, 53 and 40. The replacement ratio of FC by DCLs was 0, 20, 40 and 60%. Test results indicated that the slenderness ratio was the most sensitive factor on the bearing capacity of slender columns under axial compression, followed by D/t ratio, and the DCLs replacement ratio was smallest factor. The ultimate bearing capacity decreased slightly with increasing DCL replacement ratio.
Sensitive behaviour of slenderness CFST filled with DCLs under axial compression
Authors: Zhang Huifeng , Cong Junping 
Published: February 2020

Abstract
The demolished concrete lumps (DCLs) has been demonstrated to replacement partial coarse aggregates when casting concrete. The experimental studied involved 12 Concrete-Filled Steel Tube (CFST) columns. Each columns diameter was 159mm, the length of specimens was 2000, 2200 and 2400 mm. The Diameter-to-thickness (D/t) ratio was 79, 53 and 40. The replacement ratio of FC by DCLs was 0, 20, 40 and 60%. Test results indicated that the slenderness ratio was the most sensitive factor on the bearing capacity of slender columns under axial compression, followed by D/t ratio, and the DCLs replacement ratio was smallest factor. The ultimate bearing capacity decreased slightly with increasing DCL replacement ratio..
A Mobile Robot Path Planning Scheme for Dynamic Environments
Authors: Li Kene , Mo Qiaoliang , Zhang Zeng , Liu Bei 
Published: February 2020

Abstract
This paper proposes a four-direction search method for obstacle avoidance of mobile robots, and the collision energy of obstacles is modeled based on the neural network. For comparison and discussion purposes, the different invariant step lengths are tested in the static environment. To take the advantages of the large and small step lengths effectively, a variable step length method is adopted to improve the performance, such as less iteration number and lower total energy. The variable step length method is also applied to the dynamic environment to explore the real-time performance for path planning. Simulation results demonstrate the effectiveness and practicability of the presented scheme.
Improvement in microstructure and properties of MgO-C refractory by addition of Fe
Authors: Liang Wanting , Deng Shijie , Zhou Zhihong , Li Xiaoyong , Xu Lei 
Published: February 2020

Abstract
In order to achieve self-repairing of MgO-C refractory in oxidizing atmosphere at high temperatures, Fe powder, serving as both antioxidant and direct-bond former, was introduced into this refractory. The effect of Fe addition on the microstructure, properties and oxidation resistance was investigated. The coexistence of (Mg,Fe)Oss and Mg(Fe1.2Al0.8)O4 was identified for the Fe-containing MgO-C refractory after graphite was oxidized, by which a network was formed in the matrix. As a consequence, both densification and direct-bond in the oxidized layer were greatly enhanced compared with the conventional MgO-C refractory, solving the issue of strength degradation during high temperature oxidation. An excellent oxidation resistance was obtained owing to the above improvements.
Surface Roughness Prediction in Grinding Process of the SKD11 Steel by using Response Surface Method
Authors: Hong Son N , Duc Trung D , Nguyen Nhu-Tung 
Published: February 2020

Abstract
This study was performed to to develop a surface roughness model in the grinded process by using the response surface method (RSM). The experimental research was performed in the grinding the SKD11 steel by using CBN grinding wheel (symbol of HY-180x13x31.75-100#). The experimental matrix was developed basing on the Box - Behnken plan with 15 experiments. Experimental results were analyzed by Minitab 16 statistical software to develop a surface roughness model. The proposed model is a quadratic function of the grinding parameters such as workpiece velocity, feed rate, and depth of cut. The model of surface roughness was verified by experimental with very consistent results. The proposed model can be used to calculate the surface roughness values of the machined part in machining process the SKD11 steel by using CBN grinding wheel.
Surface Temperature Prediction of Asphalt Pavement Based on GBDT
Authors: Qiu X , Xu W Y , Zhang Z H , Li N N , Hong H J 
Published: February 2020

Abstract
Asphalt is a temperature sensitive material, distribution characteristics and vary rules of asphalt pavement temperature have an important impact on the bearing capacity and performance of pavement, which is a concern of domestic and foreign researchers. The objective of this study was to explore the correlation between pavement temperature of asphalt pavements and meteorological factors and implement an accurate trend prediction of the asphalt pavement temperature. First, errors and missing data in the meteorological dataset were cleaned. Then, the three kinds of temperature prediction models of asphalt pavements in winter were established by Gradient Boosting Decision Tree (GBDT), Random Forest (RF) and Linear Regression (LR). The results indicate that GBDT would perform an excellent ability on prediction. The mean-square-error of the GBDT predicting results has a lower value of 1.5 when compared with the Random Forest and Linear Regression owing to the high robustness and the good generalization ability, which reflects the GBDT model has a good applicability in the field of prediction. The research would serve as a technical support for the machine learning algorithms applied in the field of the application of prediction problems.
Kinematic synthesis of a reconfigurable robot manipulator with lattice morphing mechanisms based on enhanced QPSO
Authors: Yin Bo , Zhao Zhenyu , Xiao Haibing , Liu Mingjun , Hu Wen 
Published: February 2020

Abstract
A kinematic synthesis approach of a modular reconfigurable robot manipulator with lattice morphing mechanisms is proposed to find the optimal robot configuration with the minimum weight. First, the structure features and types of lattice mechanisms are introduced. Then, a synthesis approach using an enhanced QPSO (Quantum-behaved Particle Swarm Optimization) to get the optimal robot configuration with the minimum lattice is presented. Finally, a computation example is given to show the optimization process. The obtained results demonstrate the feasibility of this approach.
Study on dynamic behaviors of a breakwater triggered by earthquakes
Authors: Lai Jie , Liu Yun , Wang Wei , Gao Chen-qiang , Niu Zi-rong , Zhu Hai-bo 
Published: February 2020

Abstract
To ensure the safety requirement of an artificial island in the construction period, the modified Hardin-Drnevich dynamic constitutive model and strength reduction method was used to analyze the dynamic response of a breakwater under the action of earthquakes. Research indicates the following: (1) the modified Hardin-Drnevich can effectively simulate the soil stress-strain relationship under dynamic action, and obtain strain hysteresis, and get permanent deformation of material; (2) the deeper the buried depth of breakwater, the greater soil pressure; (3) dynamic pressure response is more obvious on both sides of the breakwater at peak time in earthquakes.
An improved pretreatment method for the fabrication of Cu-Ag core-shell nanoparticles
Authors: Zou Q Y , Yang G N , Wang P Y , Zhang Y , Cui C Q , Zhang K 
Published: February 2020

Abstract
A pretreatment method of nitric acid pickling is applied in the fabrication of Cu-Ag core-shell nanoparticles. By tuning the pH value and the concentration of Cu ions after acid pickling, the cleaning and separation process can be eliminated. This simplified pretreatment process can prevent the oxidation and particle loss. The as-prepared Cu@Ag nanoparticles show promising coating quality, oxidation resistance and quasi-spherical core-shell microstructure. Such a pretreatment method provided by this study could be promising in further rapid fabrication of Cu-Ag core-shell nanoparticles.
Research Status of Ultrasonic Vibration Assisted Plastic Forming Process
Authors: Chen Zhanbin , Yang Lianfa , Zhang Kunyan , Jiang Jingyu , Zong Pengju 
Published: February 2020

Abstract
Ultrasonic vibration assisted plastic forming is a process method for assisting the forming of metal materials by means of ultrasonic vibration devices. It is proved that the ultrasonic vibration could reduce the forming force, improve the friction environment, and enhance the formability of the metal material. However, there are some differences in forming characteristics for different materials under different vibrational plastic forming processes. In this paper, the forming principles, the vibration application modes and the forming characteristics of the ultrasonic vibration assisted the wire drawing, equal channel angular pressing (ECAP), upsetting, drawing of the sheets and hydroforming of the tube are reviewed. It emphasizes on the various processes’ improvement of the forming efficiency and the quality of the formed parts under the aid of ultrasonic vibration. Finally, the future development trend of ultrasonic vibration assisted plastic forming was prospected.
Experimental Study on Continuous Laser Polishing Die Steel S136D
Authors: Zhao Zhen Yu , Zhang Zhen Jiu , Yin Bo , Xu Xiao Mei 
Published: February 2020

Abstract
With the traditional polishing method the mold material will cause problems such as difficulty in processing the micro-area surface and damage to the surface of the workpiece. Laser polishing technology is an advanced and new surface processing technology that has emerged in recent years. Because laser polishing has the characteristics of good polishing quality and low thermal effect, it is very suitable for high-precision polishing of mold steel, titanium alloy and other materials. By properly controlling the process parameters such as laser energy density, scanning speed, scanning pitch and defocusing amount during laser polishing, the workpiece can be polished with high precision and the surface roughness can be quickly reduced. The processing examples in the paper further illustrate the superiority of laser polishing.
Improvement of physical, mechanical and strength behavior of cohesive soils with natural pozzolana and brick dust
Authors: Chang E , Villalta J , Fernandez C , Duran G 
Published: February 2020

Abstract
This research project seeks to improve soil properties through experimentation with geotechnical purposes. For this, will be used natural volcanic pozzolana in 5%, 10%, 15% and brick dust in 10% giving it a second reuse. The soil improvement will be analyzed with the proposed additions and its influence on the results. It is concluded that the addition improves the behavior of the soil by decreasing its plasticity index, increases the compaction index and improves the geotechnical parameters.
Use of recycled broken bricks as Partial Replacement Coarse Aggregate for the Manufacturing of Sustainable Concrete
Authors: Pinchi S , Ramírez J , Rodríguez J , Eyzaguirre C 
Published: February 2020

Abstract
The bricks are one of the primary materials required for construction of homes that no used completely when executes all the walls due, the excess purchase, the cutting to be settle, the breaking for their transfer and its fixed dimensions; this situation requires monitoring on work site the order, cleanliness and accidents. A common practice is these bricks and/or waste are included in the clearing construction before being deposited or eliminated in dumps or sanitary landfills, with their early clogging and shortening them to ther design lifespan. An important alternative to reduce this waste, is to recycle them and reuse them as a concrete component material, due to their high absorption percentage that allows them to keep the water inside of them and then use it in the cement hydration process as internal curing of the concrete. In the present investigation, the effect of crushed clay brick as a replacement for coarse aggregate in concrete processing is studied. The results indicate that with 21 % replacement brick, the plastic contraction decreases, and the compressive strength and flexural strength increase.
Productivity improvement of tower crane in tall buildings
Authors: Manrique A , Saman J , Rodriguez S , Melendez K 
Published: February 2020

Abstract
The tower crane is an electromechanical equipment that is used for the vertical transport of materials in a construction project and together with the two riggers form the work team to carry out this task. One of the main problems in the construction of multifamily buildings corresponds to the use of the tower crane because vertical transport causes non-contributory times, which is, dead times and waits above expectations. This research analyzes the current vertical transport process and proposes its optimization through some management tools with the aim of improving the productivity of the use of the tower crane by reducing non-contributory times. To this end, the productivity of the work team is recorded in several projects with similar characteristics, then the main problems are selected to analyze them and finally the process is optimized. The results determined that non-contributory times can be reduced by 10% if there is an orderly and continuous process.
Numerical simulation of the plunge stage of friction surfacing of AA5083 aluminum alloy
Authors: Li Hongjun , Xu Zhuang , Zhou Zhewei 
Published: February 2020

Abstract
Plunge stage is crucial to the success of whole friction surfacing process. To investigate the effect of parameters, the CEL modelling method in the finite element software model was used to simulate the plunge stage of friction surfacing. The results showed that the higher rotation speed would result a smaller axial force but higher the center point temperature and frictional dissipation; Besides, a higher feed rate, who can cause higher peek value of axial force and the center point temperature rises faster, is inversely proportional to the frictional dissipation, and the final axial force and the center point temperature tended to be in the same range.
Eco-Concrete for Hydraulic Structures with Addition of Colloidal Nano-Silica
Authors: Salguero C , Castañeda L , Rodríguez J , Carrera E 
Published: February 2020

Abstract
In the construction of buildings and infrastructures, high resistance materials are used due to current design requirements, concrete being one of the main materials used in the execution of these projects whose cement content is limited to obtaining an economic concrete and of minimum retraction. This limitation requires the use of new additions such as Nano Silica (NS), which due to its nanometric structure is used as a partial replacement for cement, producing an increase in strength in concrete. The present investigation studies the partial replacement of the NS in the cement to determine its behavior in compressive strength, diametric compressive strength, water permeability coefficient. The results indicate that with an addition of 0.225% of NS the compressive strength and splitting tensile strength are increased and the water permeability coefficient decreases, all of them compared to a conventional concrete.
Short Review of Polymer Composites for 3D Printing
Authors: Zhu Z H , Zhang N , Wang T , Hao M Y 
Published: February 2020

Abstract
3D printing technology is a rapid prototyping technology, which can use different materials to prepare real objects through layer by layer printing based on three-dimensional digital model. At present, the material with the largest amount of application and the most extensive molding method is polymer material. The research of ABS, PLA, PCL, TPU, photosensitive, resin polymer hydrogel and their composites are reviewed in this paper.
Methodology for determining optimized traffic light cycles based on simulation
Authors: Rivera G , Velasquez L , Bravo A , Miñano P 
Published: February 2020

Abstract
In large urbanized cities, a major problem that affects the economy and health of all citizens is vehicular congestion. This is because the traffic light cycles are not adequate. In the present study, we seek to optimize traffic light cycles based on simulation, in order to improve vehicle flow. For this, the PTV Vissim 9.0 software was used as a simulator and the Synchro 10.0 software to determine the initial optimal traffic light cycle. Through several runs and having as variables the length of queues, delay times and the average speed, the optimal traffic light cycle could be found for the study area. The results obtained reflect a 14% reduction in delay times and 10% in queue lengths. On the other hand, the average vehicle speed increased by 10.56%. All this represents an improvement in the service level of the study intersections.
A 3-D Analysis on the Loading Behaviours of an Under-reamed Anchor in Cohesion-less Soils
Authors: Hsu Shih-Tsung , Chen Xiang-Yang , Wang Yi-Fan 
Published: February 2020

Abstract
This study adopts a constitutive model for sand and a 3-D numerical software, named “FLAC3D” to examine the anchorage behaviours of an under-reamed anchor in sandy soil. A series of pull-out test on model anchors is performed to confirm the results obtained numerical analyses. Test results reveal that the load-movement curves computed numerically are get close to those estimated experimentally. For under-reamed anchors with dimensions of D=0.075m, L/D=4.5, and installed in sandy soil of Dr=70% (Dr: relative density, D: diameter of anchor, L/D: fixed end/diameter ratio), the shape of load-movement relationship on a deep anchor differs from that of a shallow anchor, especially the shape of end resistance-movement curve. However, the friction force, end resistance and total load do not attain peak values at same anchor movement. The end resistance of a shallow anchor displays obviously peak value. However, the peak value the end resistant cannot treasured from a deep anchor. The friction load presents peak and residual values. The mainly pull-out load of a shallow anchor is donated by the friction load, meanwhile the end bearing governs the pull-out load of a deep anchor; overburden depth of 12D is the shallow/deep anchor demarcation. According to the definition of end bearing coefficient, it is categorised to a deep anchor as the overburden surpasses 12D, it is a shallow anchor if the overburden is smaller than 7.5D, and as the overburden equal to 7.5D∼12D, the anchor can be classified as a transit anchor.
Re-liquefaction of Sand in Shaking Table
Authors: Nepal Dikshit Babu , Deng Jianliang , Chen Jinjian , Maakoe Tshegofatso 
Published: February 2020

Abstract
Subsequent aftershocks can induce reliquefaction of sand. In the shaking table experiment, the settlement, the excess pore water pressure and the acceleration response of the sand in the process of reliquefaction were measured. It was found that: (1) the liquefaction resistance of sand was the lowest in the second liquefaction, not in the first liquefaction; (2) Liquefaction resistance is depth-dependent, and the soil layer near the surface of soil is most likely to be liquefied; (3) In the model test, the attenuation of seismic shear wave acceleration is not only related to distance but also to the vibration frequency and to the liquefied layer; (4) The amplitude of the acceleration response increases with the number of the shaking. This result indicates that: (1) the phenomenon of re-liquefaction of sand induced by earthquake is not same as that of the first liquefaction. Therefore, the conventional strategy for liquefaction resistance needs to be improved before it can be implemented for analysis of reliquefaction. (2) The attenuation of seismic shear waves in liquefied soil layer has some properties different from the normal soil layer; thus the traditional attenuation calculation method needs improvement in the evaluation in the analysis of site liquefaction.