bluuebunny/crossref_metadata_2025_split huggingface dataset:
Topology Optimization of Welding Spots for Stainless Steel Subway Vehicles
Authors: Yana LI , Dejian SONG , Man ZHANG 
Published: November 2020

Abstract
Taking the head car body of the stainless steel subway as an example, the static strength of the vehicle body and the shear strength of the welding spot is checked according to different thicknesses and weld nugget diameters under dangerous conditions. For the unqualified position of the welding spot strength, the welding spot layout schemes are improved. At the same time, the topology optimization is performed for the main welding spot layout areas in the scheme improvement. The optimization results show that the number of welding spots is reduced by 49.33% and 52.04% compared with the original scheme and the improvement scheme respectively under the premise of ensuring the structural strength. The obvious optimization effect provides a useful reference for the future design of stainless steel spot welding subway vehicles.
Dynamic Recrystallization Behavior and Model Study of Equiaxed Fine Grain Structure TC4
Authors: Yi Zong-xin , Li xiao-qiang , Pan Cunliang 
Published: November 2020

Abstract
Thermal compression test of equiaxed fine grain structure TC4 was conducted by using Glebble-3800 testing machine. The deformation temperature ranged between 800-950 °C, the strain rate ranged between 0.01-10 s−1, and the deformation was 60%. The dynamic recrystallization behavior under this condition was analyzed. The results show that the dynamic recrystallization behavior of equiaxed fine grain structure TC4 is sensitive to temperature and strain rate. The grain size and volume ratio of dynamic recrystallization increases with increasing temperature and decreases with increasing strain rate. In this paper, with the β-phase transition temperature as the boundary, a dynamic recrystallization critical strain model, a dynamic model and a critical size model of the equiaxed fine grain TC4 are established. The predicted value of the established constitutive model is in good agreement with the experimental value, which provides a theoretical basis for the microstructure control of the alloy during plastic processing.
Preparation of Fluoramphibole Glass Ceramics by The Mechanochemistry Method
Authors: Si Wei , Li Shuangyu 
Published: November 2020

Abstract
The fluoramphibole glass ceramics were successfully prepared by mechano-chemistry method using waste glass and fluormica powder. The effects of ball milling parameters on synthesis of fluoramphibole glass ceramics were studied by means of XRD and SEM. The mechanical properties of the samples were discussed. The results show that the optimum preparation conditions were as follows: the processing of 10 to 1 ball to powder weight ratio, rotation speed of 800 rpm and milling of 45 minutes. Under these conditions, the highest value of modulus of rupture for fluoramphibole glass ceramics is 41.73 MPa.
Numerical simulation of laser-arc hybrid welding of high strength steel
Authors: Fulong ZHANG , Hong ZHANG , Shuangyu LIU , Fengde LIU 
Published: November 2020

AbstractThe numerical simulation of high-strength low-alloy steel in the welding temperature field is carried out. The SYSWELD special welding analysis software is used to establish the geometry model of the butt joint of the flat Y-shaped groove. The temperature field of single-layer and multi-layers welding of 12 mm high-strength low-alloy steel provides a theoretical basis for the welding process and has engineering practical value.
Research on the influence of end effect on forming result of saddle curved part in flexible rolling process
Authors: Li Yi , Yan Xin-yue , Li Ming-zhe 
Published: November 2020

Abstract
Flexible rolling is suitable to manufacture small batch of 3D curvature parts with various shapes. In this paper, the influence of end effect on saddle curved part was studied firstly. The finite element model was designed based on the flexible rolling forming apparatus. The areas characteristics of forming saddle curved part were analysed, and the influence of end effect on the saddle curved part with different forming size was studied. The results demonstrate that: the forming saddle curved part consists of three forming areas by characteristics, and the forming mechanism of each forming area is analyzed deeply; under the end effect action, with the sheet length increases, the plastic strain and minimum forming thickness of forming curved part are stable; when the sheet length is 200mm, 300mm, 400mm and 500mm, the percent of the stable forming area of forming curved part is 52%, 72%, 79% and 83% respectively, and the percent of stable forming area increases by 20%, 27%, 31% respectively, therefore the utilization rate is obviously improved. With the increasing sheet width, the plastic strain is increasing and the minimum forming thickness is decreased; when the sheet width is 85mm, 90mm, 95mm and 100mm, the percent of stable forming area of forming curved part is 67%, 61%, 59%, 58% respectively, and the percent of stable forming area decreases by 6%, 8%, 9% respectively, therefore the utilization rate is decreasing.
Failure analysis of Desuperheater
Authors: Zhang Xuechao , Zhang Yanfei , Yun Feng , Cheng Lu 
Published: November 2020

Abstract
Temperature regulation by desuperheater spray is an important part to ensure the stable operation of utility boiler. However, due to the bad working conditions, the spray pipe of Desuperheater will produce strong vibration, and the connected equipment will have alternating stress. At the same time, due to design or manufacturing reasons, abrasion or cracking occurs at the welding part or the contact part between the water spray pipe and other parts. Taking measures to ensure stable operation, reasonable design and qualified manufacturing can effectively guarantee the safe operation of power plant equipment.
Design and analysis of automatic transmission for Ravigneaux transmission with four speed
Authors: Song Xiaoyan 
Published: November 2020

Abstract
The automatic transmission can automatically choose the gear according to the engine condition and the running speed of the car. In this paper, according to the structure characteristics of planetary gear mechanism, the different combination of shift actuators, get the movement rule and working principle of each gear position, calculated the specific parameters of each row of planetary gear mechanism. Next the article take Ravigneaux type of four gear automatic transmission for example, complete the design of automatic gearbox transmission mechanism, include various gear transmission route and the transmission scheme design, finally through the concrete parameters, finish the structure design of the whole planetary gear transmission part.
A Cooperative Path Planning Algorithm for Handling Robot
Authors: Cai Li , Zhu XiaoLing , Li Jingchuan 
Published: November 2020

Abstract
Path planning is one of the core research fields of the handling robot, which has the characteristics of complexity and constraint. Ant colony algorithm is a search algorithm developed in recent years, which has good performance and development potential in solving many complex problems. In this paper, ant colony algorithm and workspace modeling are used to determine the optimal path for the global path search algorithm of the handling robot. The results of spatial modeling and software simulation show that the ant colony algorithm has advantages in the path planning of the handling robot. This path planning algorithm can provide the corresponding solutions for the search path problem of the complex robot.
Research on simulation training method based on computer simulation technology
Authors: Huang Shaoluo , Li Siyu , Meng Shuo , Wu Weiyi , Wang Handong , Su Kai , Peng Rui 
Published: November 2020

Abstract
Simulation training is based on virtual reality and computer simulation technology as the main technical support, so as to realize the combat method of training personnel in the virtual battlefield environment, weapon system operation, joint operations under the battlefield environment, including operational method of simulated training, simulation training as a military exercise method has important practical significance.
Influence of annealing conditions on tripe-layer TiO2/Si3N4/SiO2 antireflection coatings for GaAs solar cells
Authors: Wu Liyu , Li Xiaoqiang 
Published: November 2020

Abstract
In this work, TiO2/SiO2/Si3N4 triple-layer antireflection coatings (TLARC) were prepared on GaAs substrate by RF sputtering and Plasma Enhanced Chemical Vapor Deposition (PECVD). Influence of annealing conditions on the structure and optical properties of TLARC were also investigated. The structure and optical proprieties were analyzed by Grazing Incidence Angle X-ray Diffraction (GIXRD) Fourier Transform Infrared Spectroscopy (FT-IR), Atomic Force Microscopy and UV-VIS spectroscopy. The experimental results were summarized as follows: diffraction peaks of SiO2, Si3N4 and TiO2 respectively appeared in the as-deposited status, and after annealing, new diffraction peak at 25.2° corresponds to TiO2 was confirmed by checking out PDF cards; Stretching vibration of Ti=O, Si-O-Si and N-Si-N was confirmed by FT-IR spectrum; The average reflectance of the TLARC after annealing at 750 °C and holding for 5 min reached the lowest value, which was approximately 7.84 %.
Research on improving VAC of auto-stereoscopic 3D display via monocular multi-view
Authors: Huo Yingdong , Zhang Jing , Wang Ronggang 
Published: November 2020

Abstract
The auto-stereoscopic 3D display technology is the most widely used 3D display technology nowadays, but its problem of vergence-accommodation conflict (VAC) remains to be solved. This paper proposes a novel method to solve this problem via monocular multi-view, aiming to alleviate the discomfort caused by VAC. By utilizing the light splitting of the parallax barrier and a specific rendering algorithm, we generate multiple images from different angles in a viewing zone. In this way, each eye can receive more than two images, thereby easing VAC through the automatic blurring adjustment of human eyes.
Research on the service topic of intelligent electricity meters’ full life cycle quality cloud service platform
Authors: Wang Yong , Zheng Angang , Shang Huaiying , Liu Yan 
Published: November 2020

Abstract
The whole life cycle management of intelligent electricity meters is dependent on the construction of "Internet +". This paper introduces the design concept and method of the intelligent electricity meter quality in whole life cycle cloud service platform, the application of scenario planning principles is proposed based on the cloud service platform. This paper analyzes the regulatory agencies, power companies, production enterprises and the public’s present situation and the pain points in whole life cycle of the intelligent electricity meter management, and researches the present situation and the spot application scenarios according to the principle of planning design, including the design idea and implementation framework of the application scenarios, laying the foundation for the construction of cloud service platform. It provides a new direction and method for the whole life cycle management of intelligent electricity meters.
Study on the shape change of crack growth rate curve under different forms of additional stress field
Authors: Jing Wang , Chenxi Song , Xiaolin Shao 
Published: November 2020

Abstract
In this paper, FRANC3D is used to simulate the fatigue crack growth process under different additional stress fields to explore the key mechanical parameters influencing the fatigue crack growth curve. For finite large plate model with penetrating crack, the crack growth rate is calculated under different forms and different values of applied load and additional stress coupling, the fatigue life curves, as well as crack growth rate curves and Pairs formulas under different applied loads are obtained. Through the analysis, the relationship between the additional stress field and the parameters in Pairs formula of crack growth rate is obtained. Because of the existence of the additional stress field, the stress intensity factor amplitude of crack tip changes, which is the root cause of the change of crack growth rate curve shape.
A First Principles Study of Electric Structures of Heterostructures Built with Blue Phosphorene
Authors: Bao Jinna , Li Hui , Hou Jianhua , Tian Jian 
Published: November 2020

Abstract
we have built the heterostructure with 2D materials C3N and BN capping on blue phosphorene. The geometric structure and electric structure of the heterostructures have been investigated by using first-principles computations. Calculated results indicate that the strong interaction exists between the two 2D materials due to the equilibrium interlayer distances in the range of 3.31 Å and 3.30 Å. Moreover, the 2D capping layers not only protect blue phosphorene from being oxidized, but also can improve the band structure of blue phosphorene.
Study on mechanical properties and wear resistance of aluminum alloy composites reinforced by basalt fiber
Authors: Wang M , Zhang X , Zhou L F , Cheng L L 
Published: November 2020

Abstract
Basalt fiber is a new type of environmentally friendly materials with excellent performance in the 21st century. Basalt fiber (BF) reinforced aluminum alloy composites with different length-diameter ratios (200:1, 400:1), different volume fraction (1%, 4%, 8%) was fabricated by room-temperature pressing and vacuum sintering method. It was found that the BF treated with electroless copper plating on the surface enhanced the mechanical properties and wear resistance of the composites, while the BF without copper plating on the surface weakened the hardness. With increasing the volume fraction of BF with copper plating, the hardness and the wear resistance of the composites increased. The length-diameter ratio ∼400:1 is superior enhancement aspect ratio of 200:1 of the reinforcing effect.
Effective Thermal Conductivity for Low Density Silicon Nitride Porous Ceramics
Authors: Bi Cheng , Lu Yuan , Yang Xu 
Published: November 2020

Abstract
Thermal conduction in porous materials generally includes four heat transfer forms, i.e. heat transfer via the gas phase, heat conduction along the solid matrix/skeleton, thermal radiation and gas-solid coupled heat transfer. The size effects on the gas and solid thermal conductivities are introduced to predict the effective thermal conductivity of the silicon nitride porous ceramic at room temperature, and the predictions from the random model present good agreements with the experimental data. The effect of the porosity on the effective thermal conductivity of the low density silicon nitride porous ceramic are studied as well, and the low density porous ceramics can achieve a low thermal conductivity in the range of 0.08-1.2 W/m K for a good performance of thermal insulation.
Preparation of zirconia fiber based on akund template
Authors: Yu QinKun , Liu Xinyu , Zhang Jingwen , Yin Fuyan , Lai Junjie , Wang Tianchi 
Published: November 2020

Abstract
Zirconia fiber is widely used in the field of fire resistance and heat insulation because of its excellent thermal insulation performance. In this study, the hollow plant fiber, akund, was used as template to prepare zirconia fibers with hollow structure. SEM, XRD, mercury porosimetry, and TG-DSC were used to characterize the microstructure, phase and crystal structure, pore size distribution, and formation process of the zirconia fiber. The analysis shows that the hollow structure restricted the air flow and was conducive to the improvement of thermal insulation performance. Yttria doping mae the phase of zirconia fiber stable. Lower heat treatment temperature made the grain size smaller. The concentration of impregnating solution can influence on the fiber morphology.
Selection of Abrasive for Chemical Mechanical Polishing of the 304 Stainless Steel
Authors: Jianxiu Su , Haixu Liu , Wanting Qi , Xiaojun Cao , Zhankui Wang 
Published: November 2020

Abstract
Chemical mechanical polishing (CMP) technology is widely used in ultra-precision machining of various materials, and the abrasive are an important component of CMP slurry. In this paper, the effects of the abrasive type, the abrasive size and its concentration on material removal rate (MRR) and surface quality in CMP 304 stainless steel were studied through a series of experiments. The results show that the MRR in CMP 304 stainless steel using slurry with the white corundum abrasive is the highest, and the MRR in CMP 304 stainless steel using slurry with the silica abrasive is the lowest, but the surface quality in CMP 304 stainless steel using slurry with the silica abrasive is the best. The MRR and surface roughness increase with the increase of abrasive size, but the surface roughness increases slowly with the increase of abrasive size. With the increase of abrasive concentration, the MRR first increases and then decreases, while the surface roughness value changes slightly, indicating that the abrasive concentration in polishing slurry has little effect on the surface quality. These research results can provide a reference for the design of CMP slurry.
Study on Friction and Wear Behaviors of Micro Texture Shape and Its Modified Surface
Authors: Rui Xu , Yipu Wang , Haixu Liu , Wanting Qi , Zhankui Wang , Jianxiu Su 
Published: November 2020

Abstract
The 304 stainless steel has good mechanical properties and is widely used in industrial manufacturing. In this paper, take 304 stainless steel as the substrate material, the five micro texture shapes, such as groove array, square column array, circular pit array, regular hexagon column array and trapezoid column array, on the surface of 304 stainless steel were carved by nanosecond laser engraving machine under the same parameters, and then were immersed in 0.5mol/l perfluorodecyl trimethoxysilane ethanol solution at 45 °C for 5 hours. Five type super-hydrophobic surfaces were obtained. A series of friction and wear experiments were conducted out and the influence of different micro texture on the friction and wear to the 304 stainless steel surface was analyzed. The results show that the square column array has the best friction and wear resistance, and its friction coefficient is 0.16, which is the lowest in all other micro texture shapes. It can be used as a reference for improving the friction and wear resistance of metal surface.
The effect of use E85 ethanol fuel on a five-stroke engine
Authors: Noga M 
Published: November 2020

Abstract
The article presents the analysis of the impact of the use of E85 ethanol fuel on operating parameters and toxicity of exhaust gases of a spark ignition engine with an additional expansion in a separate cylinder. Such an engine in literature most often referred to as five-stroke was developed at the Cracow University of Technology (CUT). The use of additional exhaust expansion was aimed at achieving high thermal efficiency when working with an average high load. The engine developed in CUT is equipped with a turbocharger and direct fuel injection, hence the use of fuel with high ethanol content was aimed at the effective use of these attributes. The obtained results indicated an improvement in the brake thermal efficiency of the engine when fuelling with E85 in relation to the gasoline of 98 octane rating normally used for this engine. On the other hand, the efficiency of the conversion of the catalytic converter has deteriorated somewhat. Directions for further activities and research in the subject were also determined.
Chemical content analysis of coral limestone as prospecting of extractive development in Gorontalo City
Authors: Annisa W , Manyoe I N , Mubarak A K , Napu S S S , Pratama I G S , Fatimah S 
Published: November 2020

AbstractThe potential of limestone in Gorontalo City is very large and distributed over a wide area. This enormous potential has not yet been exploited. This study aims to determine the chemical content of limestone and the use solution of limestone to improve regional development. Field data collection was carried out in two places, namely Tanjung Keramat and Buli’ide. Sampling was conducted at the coordinates N 0°29′38.93″ and E 123°2′49.62″ for station 1, N 0°32′53.7″ and E 123°1′56.19″ for station 2. The method used in this research is chemical composition analysis using X-Ray Fluorescence (XRF). The results of the analysis of the chemical constituents of Coral Limestone are CaO 83.35%, Fe2O3 6.92%, SrO 9.35% and ZrO2 3.25%. The prospect of Coral Limestone can be used in various industrial fields. Coral Limestone can be used in the mining industry, the cement industry, the sugar industry, ceramic raw materials, building materials, agricultural and road stabilizers. This indicates that the City of Gorontalo has the prospect of development and utilization of limestone resources available, in order to encourage self-reliance and open employment for community.
Geodiversity of the Togean Islands National Park, Central Sulawesi Province for Geopark Assessment
Authors: Sendjaja Purnama , Suparka Emmy , Botjing M U 
Published: November 2020

Abstract
The Togean Islands National Park is located at the Gulf of Tomini, Central Sulawesi Province, Indonesia. The islands officially become National Park in 2007, initiated by the government of the Tojo Una-Una district in 2004. There is a variety of geodiversity within the Togean Islands National Park, such as active volcano, ophiolitic pillow lava, beautiful beaches and islands formed by lithology of volcanic deposits, igneous intrusions and quaternary limestone formation. Four geodiversity areas are provided within the national park, according to lithological and geomorphological aspects. Those are the Una-Una Island active volcano, karst topography of limestone around the Batudaka Island, the lava dome at the Togean Island and the ophiolite complex of Walea Islands. The Una-Una volcano island is unique based on the location and anomaly in magma affinities. The Soliter volcano separated from the volcanic belt along the North Sulawesi Arm and has the adakite signature compared to tholeiitic - calk-alkaline as dominant affinities from the North Sulawesi island arc province. The Batudaka Island - karst topography offers sailing and cruiser to the beautiful shape and scenery of karst topography of limestone formation, cave, sandy beaches and blue ocean. The lava dome of the Togean Island: provides a geomorphological landscape that represents the dome of trachytic igneous rock above sea level. The Walea ophiolite: of a geoheritage showing rock formation, consists of ophiolitic pillow lava and the tectonic fossil of subduction between tectonic plates around Sulawesi Islands. Overall, the Togean Islands National Park proposes many adventure sites for diving, snorkelling, surfing, fishing, sea birds and dolphin watching and also conservation of reef, fish and geoheritage sites. Several facilities are already available inside of the National Park, such as resorts and cottages for accommodation, sailing and diving rental for leisure activities.