bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of End-to-End Connectors in Elastic GFRP Gridshell
Authors: Baral Kedar , Cheng Bin , Xiang Sheng , Sharma Suraksha 
Published: February 2020

Abstract
The presence of end-to-end connectors for lengthening the glass fiber reinforced polymer (GFRP) pipes in elastic gridshell causes imperfections in the structure. Such geometrical imperfections alter the structural properties of members and affect the overall performance of the structure. Hence, for a comprehensive analysis of such structures, the aforementioned imperfections need to be acknowledged. In this study, an equivalent rigid part (ERP) for the connector was proposed for taking into account the effect of connectors in the structural analysis. The applicability of ERP for predicting the deformation of structural members was first verified by bending beam models. A typical GFRP elastic gridshell was further utilized for investigating the effects of connectors (with two different arrangement) in the shape and stress of the structure. Results show that proposed ERP is practicable for simplifying the end-to-end connectors in the structural analysis model. Significant differences in results were found between the analysis with and without the consideration of end-to-end connectors, and therefore the effect of connectors should be considered during structural analysis of elastic gridshell.
Investigation of process for producing carbide-containing welding fused fluxes using plasma granulation
Authors: Artemov A O , Naumov S V , Ignatov M N , Belinin D S 
Published: February 2020

Abstract
This article proposes a technology for producing fused welding fluxes using plasma granulation. The developed technology enables producing welding flux granules with carbide-containing additives. This is possible due to high dynamic and temperature effects of plasma arc on mineral raw materials that stops refractory additives from melting and thus remaining in welding materials composition. Using petrographic analysis, it was found that silicon carbide particles remain unchanged in granules of fused welding fluxes composition. Plasma granulation technology makes it possible to obtain both finished products such as welding fluxes and a charge ready for manufacturing cored wire and coated electrodes.
Obtaining welding materials of various structures, fractional and chemical composition using plasma granulation
Authors: Naumov S V , Artemov A O , Kartashev M F , Sheksheev M A 
Published: February 2020

Abstract
The article proposes the technology for producing fused welding fluxes grains of various structures, fractional and chemical composition using a highly concentrated heat source. Interaction processes between the highly concentrated heat sources and mineral raw materials are presented in the article. The necessary components for obtaining welding flux with various granule structures are determined. The proposed technology allows to obtain welding flux granules with a range from 0.1 to 3.0 mm that meets regulatory documentation requirements. It was found that during the process of plasma granulation there is a decrease in the concentration of alkali metals to the required content for welding fluxes. At the same time, there is an increase in the concentration of basic elements such as silicon, calcium, aluminum and other metals
Mechanical properties and self-cleaning mortar capacity C/A 1: 5 of Portland cement modified with titanium dioxide (TiO2)
Authors: Flores H , Bernuy G , Huerta C 
Published: February 2020

Abstract
The deterioration of the surfaces of the constructions made with mortar C/A 1: 5 of Portland cement, are produced by being exposed to the emission of toxic gases emanating from the growing automobile fleet, this problem causes alternatives to be sought in order to counteract its effect on buildings and the environment. A new method to deal this problem is the incorporation of the titanium dioxide photocatalyst (TiO2) into the Portland cement mortar, which can develop self-cleaning and air purification properties to be in contact with sunlight. This work seeks to introduce this organic component to the Portland cement mortar, used for the facade charging and structural elements, for this purpose, different percentages (5%, 7.5% and 10%) of titanium dioxide (TiO2) are added and the properties of the modified mortars making use of [1] compression tests, [2] fluidity tests, [3] absorption tests and [4] photocatalytic activity tests with which the self-cleaning capacity was verified. This study concludes that the best percentage of titanium dioxide addition is 5%, with which the Portland cement mortar is granted self-cleaning property without substantially damaging its mechanical properties.
Finite element analysis and experimental study on laser welding temperature field of dissimilar metal materials
Authors: Xiao Haibing , Zhang SongLing , Zhou Yongquan , Xu Xiaomei , Luo Bowei 
Published: February 2020

Abstract
Aiming at saving defects and cracks of dissimilar metal materials laser welding, the finite element analysis of temperature field and new welding process of stainless steel/Al, stainless steel/Cuwere developed in this work.Taking stainless steel/Al, stainless steel/Cu dissimilar materials laser welding for example, the physical model was established, and the finite element simulation of three-dimensional temperature field of laser welding was carried out based on Abaqus CAE. The results show that the simulation of temperature field provides reference for experimental process parameters, fiber laser welding is applicable to stainless steel/Cu, stainless steel/Al with lower laser welding defect.The process parameters were optimizedto achieve better welding quality and solve welding defects.The accurate prediction of temperature field distribution in dissimilar materials laser welding is great significance for practical process guidance.
Cooling performance improvement of circulating internal cooling turning tool by built-in additional spray cooling nozzle
Authors: Shu Shengrong , Zhang Yu , Xiao Caiwei , Qi Xiaoning , Liu Leping 
Published: February 2020

Abstract
Aiming at the demand of high efficiency green cooling cutting of difficult-to-machine materials, a novel composite cooling turning tool design concept based on circulating internal cooling combined with spray cooling is proposed in this paper. Thermal-fluid-solid coupling simulation models were developed based on FLUENT software, which are applied to investigate the cooling performance of two type of composite cooling tool which are single-nozzle type and double-nozzle type, and the circulating internal cooling tool. Simulations results shown that the tool-chip interface temperatures of the three tools are from low to high under the same conditions, followed by the composite cooling turning tool with double-nozzle, the composite cooling tool with single-nozzle and the circulating internal cooling tool. The double-nozzle type of the composite cooling tool exhibits a better cooling and lubrication performance.
Effect of Quartz Sand on Compressive Strength of High Performance Basalt Fiber Concrete
Authors: Dongdong Yao , Hongru Ji , Zhe Lu , Xinjun Li , Jie Li , Zhengang Feng 
Published: February 2020

Abstract
The QS with different sizes was used to prepare the HPBFC according to the closing packing theory. The universal mechanical tester was applied to test the compressive strength of HPBFC specimens after different curing periods. Effects of the QS with different sizes and mixing ratios on compressive strength of the HPBFC were compared and the development of compressive strength of the HPBFC during different curing time was analysed. Results show that the QS with small particle size can significantly increase the compressive strength of HPBFC. The HPBFC with small size of QS not only possesses the highest compressive strength at different curing stages, but also has the fastest increasing rate during the standard curing conditions.
A regenerative chatter observer analysis for micro-milling
Authors: Liu Di , Liu Xiaoli , Pei Xuming , Wang Caidong , Chen Lumin 
Published: February 2020

Abstract
The regenerative chatter in micro-milling that is employed to produce small products with complex 3D geometries and high precision is gradually getting attention from researchers in the field of manufacturing, mechatronics and control for its severe damage to the cutting tool and micro-milling stability. To facilitate developing observer-based control strategy for suppressing the regenerative chatter, the integrating an adopted observer proposed for nonlinear systems with time delay and a practical regenerative chatter model for micro-milling is presented in this paper. And the observer analysis is shown. Simulation results are given to validate the integration scheme.
Experimental and numerical investigation of cold roll forming process
Authors: Murugesana Mohanraj , Sajjadb Muhammad , Jung Dong Won 
Published: February 2020

Abstract
This research work is focused on the cold roll forming process to produce U-channel from the flat sheet. The mechanical properties of aluminum alloy was obtained from the tensile test and subsequently, the properties were incorporated into LS-DYNA to define the material plastic region. The forming process involves the progressive sheet deformation by passing it through a roll pass at constant roll speed. Each sets are designed at different bending angle to increase the deformation until the final geometry is achieved and here, the forming machine with four roll stands were used to manufacture the parts. As a sheet is going into different passes at the same time, the sheet plastic deformation is so complex and highly non-linear because of various stress and strain developments. From experimental results, at low roll speed (RS) the longitudinal bow was observed in the formed parts and to investigate, numerical simulation was modeled at various roll speed and found that as roll speed increasing the longitudinal bow noticed to be decreasing. To confirm the finite element results, one more experiment at high speed was performed and the obtained results showed better agreement with the simulation results. Before confirming the accuracy, many issues were encountered and modified such as mesh size at roller and blank, contact mechanism, choosing element formulation and friction coefficient. Furthermore, the adaptive meshing procedure was adopted to efficiently remesh the sheet at contact locations. The research procedures presented can be utilized to perform the forming process for any existed or new material to form a desired shape for a specific applications in the automobile and aerospace industries.
FM analysis of aging properties of UV531/SBS modified bitumen
Authors: Zhengang FENG , Fengjie CAI , Dongdong YAO , Xinjun LI 
Published: February 2020

Abstract
Ultraviolet absorber UV531 and linear SBS modified bitumen were selected to prepare SBS modified bitumen via melt blending. Thermal-oxidative and ultraviolet (UV) aging of SBS modified bitumen were simulated by the film oven test (TFOT) and accelerated UV aging. The influence of UV531 on the micromorphology of SBS modified bitumen before and after aging was analyzed by fluorescent microscopy (FM). Combined with the three indicators and aging properties of modified bitumen, the relationship between microstructure and properties of SBS modified bitumen and UV531/SBS modified bitumen was discussed. The FM images show that the UV531 improves the thermal-oxidative aging property of SBS modified bitumen, but it has little effect on UV aging.
Investigation of bow defect in roll forming
Authors: Sajjada Muhammad , Murugesanb Mohanraj , Jung Dong Won 
Published: February 2020

Abstract
Even though New materials are coming into the market Aluminum Alloy is still widely used in Aerospace, Automobile and defense industries. The main reason is these alloys are light weight, high strength and easy to recycle. Many traditional methods like punching, shearing and blanking has been widely used previously to deform these sheets in different industries. Meanwhile, roll forming which is die less processing method, has been used for manufacturing of parts for automobiles and aircrafts structure parts. In this paper, combination of numerical simulation and experimentation of Aluminum alloy 5052 for bow reduction has been studied for U-shape sections. From results it was concluded that the bow defect is significantly reduced by increasing the forming speed of forming rollers.
Effect of early strength agents on specified density concrete
Authors: Yan Shuaishuai , Zhang Ming 
Published: February 2020

Abstract
Early strength agents are beneficial to improving early strength of concrete, thereby shorting curing time as well as production efficiency of concrete products, and consequently saving production costs. This study investigated the influence of triethanolamine, potassium carbonate, Calcium formate and Potassium aluminum sulfate on properties of specified density concrete, based on orthogonal experiment, composite early strength agent is determined.
Influence of Cr3+ Doping on Photocatalytic Hydrogen Production Performance of TiO2 Film Growing in Situ on the Surface of Ti Plate
Authors: Bai Xuefeng , Wu Wei 
Published: February 2020

Abstract
The Cr3+ doped TiO2 films (Cr@TiO2) were prepared by in-situ growing on the pure Ti plate substrate in the electrolyte solution of Na3PO4 containing a certain amount of K2Cr2O7 using micro-arc oxidation (MAO) technique. The Cr@TiO2 were characterized by SEM, XPS, XRD and DRS. The influence of Cr3+ doping amount on the morphology, structure and photocatalytic hydrogen production performance of Cr@TiO2 was studied. The characterization results showed that Cr3+ doping into TiO2 film not only affects the crystallinity of TiO2, but also affects the composition of crystal phase, and the maximum absorption edge of Cr@TiO2 reflects an obvious redshift, reaching around 650 nm of visible light with the increase of Cr3+ content. The Cr3+ doping was good for the improvement of photocatalytic performance. The Cr@TiO2 prepared under the condition of K2Cr2O7 adding amount of 0.29 g/L exhibited the highest rate of 0.378 mol/cm2•h
Improved mechanical properties of a high plasticity clay soil by adding recycled PET
Authors: Alvarez A , Sosa J , Duran G , Pacheco L 
Published: February 2020

Abstract
To the problems posed by clay soils of high plasticity, such as vulnerability to variations in volume, producing differential settlements causing damage to structures, it is due to factors such as this it was decided to seek an alternative enhancement to parameters such as increased resistance, friction angle and cohesion of a high plasticity clay soil (CH). In the execution of civil works, these parameters generally do not conform to the requirements of the project, for that reason should seek a solution for the stability of the soil involved in any construction. The constant search for improving environmental conditions has led to the use of waste plastic to reinforce the soil and improve its mechanical and physical properties. That is why according to our proposal we try to increase data for the use of this alternative material as a soil improvement proposal, obtaining interesting and different results to that found in other investigations that used similar materials. We chose crushing polyethylene terephthalate (PET) obtaining a recycled PET 3-5 mm length as a reinforcing material to stabilize and improve the mechanical properties of the soil. According to standard proctor assays and direct shear, it was determined that the optimum percentage to be added is from 1% to study the soil because of better behaviors were observed study material with respect to the other mixtures.
Research of elevator real time monitoring method based on spark
Authors: Jianpeng Huang , Xiyang Jiang , Yifei Tong , Feng Gu 
Published: February 2020

Abstract
With the development of economy, elevator has become one of the essential means of transportation in people’s life. However, due to the complexity of the elevator internal system, the sensors collect a large number of elevator operation data so that the reliability and real-time of data processing is very important for the safety monitoring of elevator operation. To solve this problem, this paper proposes an elevator real-time monitoring method based on spark. By using the stream data processing method provided in spark streaming, a large number of real-time data are divided into time windows, the data is divided into small batches of data below the second level and submitted to spark engine for analysis and processing, which greatly improves the speed and throughput of data processing.
The research status of key problems of experimental equipment for tube hydroforming
Authors: Zhang Kunyan , Yang Lianfa , Chen Zhanbin , Huang Jinjie , Ma Jianping , Zong Pengju , Jiang Jingyu , Liu Jun , Li Xianzhang 
Published: February 2020

Abstract
Tube hydroforming technology is an advanced manufacturing technology adapted to lightweight structure. The technology has the advantages of low production cost, high material utilization rate and light part quality. Forming equipment is the basis for implementing the technology, the performance of the equipment greatly affects the product quality. However, the key problems affecting the performance of the equipment include: loading path, axial feeding and sealing method, etc. The article is for the purpose of key question carrying on the system combing with the discussion. Among them, several hydraulic pressure control methods are summarized, the influence of different loading path on tube hydroforming is shown, A loading method that axial stress - circumferential stress is always proportional in the forming process is proposed. Meanwhile, the control method of axial feed is summarized, it is expressed that axial feeding can improve tube forming ability. Besides, five kinds of common pipe sealing methods were compared, the reliable and effective sealing structure is summarized.
Synthesis of SAPO-41 Molecular Sieves with Different SiO2/Al2O3 Ratios and their Catalytic Performance of n-Decane Hydroisomerization
Authors: Wang Han , Guo Chunmu , Meng Jinying , Li Ting , Luo Le , Wang Quan , Wu Wei 
Published: February 2020

Abstract
Using di-n-propylamine (DPA) as a template, SAPO-41 molecular sieves with SiO2/Al2O3 ratios (n) of 0.3, 0.5, and 0.7 were synthesized. Their structure, morphology and acidity were characterized by XRD, N2 physical adsorption, SEM, and Py-IR. All the synthesized samples have characteristic diffraction peaks corresponding to the AFO topological structure, which means that samples are pure phase SAPO-41 molecular sieve. The samples exhibited a highly ordered prismatic morphology with regular arrangement of individual grains, wrapped in flakes, and possessed complete channel structure. With the increase of n, the specific surface area and the amount of B acid showed a downward trend after increasing. Hydroisomerization reaction results of n-decane over SAPO-41 loaded with 0.5wt% Pd (Pd/SAPO-41(n)) showed that the higher the amount of B acid, the higher the conversion of n-decane,and high specific surface area and moderate B acid are favorable for yield of isomerization products. When the conversion of n-decane catalyzed by Pd/S41(0.3)-P was 88.9%, the yield of hydroisomerization products reached 83.3%.
Roughened bed stilling basin and its hydraulic jump characteristics
Authors: Liu Yakun , Zhang Di , Wu Jian , Zhang Dong , Yang Miaomiao 
Published: February 2020

Abstract
The roughened-bed stilling basin, serving as one new type of energy dissipator, has been analyzed both theoretically and experimentally in the literature. This study deduces the calculation formula of the length of the curve C0
between the flow-depth contraction section (i.e. hc) and the section just before the hydraulic jump (i.e. h1) when the same elevation is employed for both the bottom of roughened-bed stilling basin and the river-bed surface in the downstream. Further, by approximately assuming the equation of the resistance force exerted on the flow and caused by the bed roughness, this study obtains the expression of the ratio between the flow depth before the hydraulic jump and that behind the hydraulic jump, namely h1/h2. With the aid of the experimental results in the existing literature, it can be concluded that, when compared with the traditional smooth-bed hydraulic jump, the sequent depth and the length of the rolling hydraulic jump can be reduced by about 20∼30% and 20∼50%, respectively, in the condition of the chopping roughness riverbed. Additionally, by combining with the hydraulic model tests, this study indicates that adding the bed-roughness can eliminate the secondary hydraulic jump, improve the flow regime and (under the circumstance of the sill-roughness stilling basin) decrease the length of the stilling basin up to about 40%∼50%. Keywords: Stilling Basin; Hydraulic Jump; Hydraulic Characteristics; Roughened Bed; Sequent Depth; Energy Dissipation
Evaluation of the geotechnical behaviour of a volcanic soil wall with additions of lime and cement against landslides
Authors: Davila C , Vera R , Pacheco L , Duran G 
Published: February 2020

Abstract
The construction of earth walls can be a significant response to prevent the next landslides from reaching the road and avoid accidents. Therefore, a material of the same slope was used and reinforced with mixtures of lime and cement, with this same reinforced material a mechanically stabilized hypothetical earth wall (MSE) was developed. An analysis of the original slope was developed to check if there was a possible failure through its safety factor. Then, a hypothetical wall was developed with a floor reinforced with mixtures, in order to assess its overall safety factor and its maximum landslides. According to the results, in principle it was determined that the dosage M-3 / C-4-4 improves in a range of 30% to 37% the friction angle. In addition, it was found that a reinforced wall, that is to say with Lime and cement additions, presents a better behaviour. In its effect, its displacements are about 8 mm and have a global factor of 1.23.
Study and assessment of (FeCrAl) and (SiC) as candidate materials for accident tolerant fuel cladding in LWRs
Authors: Sagiroun Mamoun I A , Xinrong Cao , Ayoub Anuor A T 
Published: February 2020

Abstract
Iron-chromium-aluminum (FeCrAl) alloys and Silicon-carbide (SiC) are considered the best choice proposed as alternative cladding materials to replace Zirconium (Zr) alloys to improve the accidents tolerance in light water reactor (LWR) cladding which have much highly oxidation resistance in high-temperature steam than Zr alloys, which lead to maintaining high performance under normal operations and enhancing safety margins during severe accidents. In this work great results were showed in the thermo-physical properties for the candidate materials compared with zirconium.
Testing research on friction and wear performance of microstructure surface of unfolding wheel for bearing steel ball detection
Authors: Chengyi Pan , Yuanqi Tong , Guanqun Cao 
Published: February 2020

Abstract
The unfolding wheel of AVIKO series steel ball surface quality automatic detector is expensive and easy to wear, which seriously restricts its application and development. In this paper, the wear reason and motion form of the unfolding wheel are analyzed, the unfolding contact model is simplified reasonably, and the corresponding experimental equipment and scheme are designed. The microstructures with different shape parameters are machined on the test pieces surface by laser machining technology, and the theoretical calculation formula for the weight of wear is obtained through friction and wear tests and data fitting. The test results show that compared with the smooth test piece, the test pieces with microstructure surface can increase the friction coefficient and reduce the degree of wear, and the diamond microstructure has the best effect on reducing the wear weight. The fitted formula provides theoretical and experimental basis for the follow-up research and the design of microstructure parameters of unfolding wheel.