bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Simulation of Thermal Performance in Hollow-structure Aluminum of Bullet Train
Authors: Shi Weibing , Li Li , Li Mengmeng , Zeng Xiao 
Published: March 2020

Abstract
In order to know the characteristic of heat transfer performance in hollow-structure aluminium, the flow and heat transfer in it of bullet train “Fuxing” was numerical simulated. Changes for the equivalent thermal conductivity under the influence of four factors—the temperature difference, wall thickness, rid thickness and number of cavities, were studied and analysed separately adopting control variate numerical method. Numerical simulation results showed that the influence of temperature difference and wall thickness on the equivalent thermal conductivity of profiles were limited; the number of cavities and rib thickness were the main factors affecting the equivalent thermal conductivity of profiles, with the number of cavities and rib thickness increasing, the equivalent thermal conductivity of hollow aluminum increased, and viced versa. In the practical application, proper parameters of hollow-structure were selected to reduce heat transfer and energy consumption of train.
Effect of Scratches on Passive Anti-corrosion in Cr-Mn Ferroalloy
Authors: Li Junlong , Feng Jianrui , Li Dingbo , Wu Xiuwen , Ling Yunhang 
Published: March 2020

Abstract
To study the scratch effect on the metal corrosion, some special scratches on the Cr-Mn ferroalloy were formed by rubbing a sandpaper on the sample surface. Two environmental cases are considered, that is, a humidity air, and a humidity air bottomed with alkaline–organic solution successively. The micro-surfaces of the samples are observed by Energy dispersive spectrometer, and the elementary contents are analyzed on an area and a line. Special scratches on the surface of Cr-Mn ferroalloy do not accelerate the metal corrosion in a humid organic alkaline environment. On the contrary, it would play a positive role in the sample passive anti-corrosion process. Chromium oxide and manganese oxide particles are produced by the oxidation of metals in a humidity air would gather in the grooves caused by the scratches. The relative study is less reported till now.
Accelerating Materials Discovery Based on Generalized Low-dimensional Conformation Performance Relationships
Authors: Qu Yuanyuan , Meng Xiangying , Jia Zixi , Liu Xiaofeng , Liu Dongyan , Li Shanshan , Bian Fang 
Published: March 2020

Abstract
The construction of conformation-performance relationships (CPRs) is the core issue of efficient material design. Different from traditional CPRs originating from experience summarizations or rational model cognitions, a strategy of generalized low-dimensional conformation-performance relationships (GLD-CPRs) for rapid material discovery has been established in this work by the aid of material information technology, providing us with a new perspective to material gene (MG) and its function on performance. From a pure computing perspective, the strategy has been concreted by a case study of semiconductor bandgap engineering. Based on more than 20,000 items of self-produced semiconductor bandgap and attributes data, a set of CPRs for bandgap regulation towards arbitrary semiconductor of the same kind has be generated using GLD-CPRs strategy. By comparing with the reported studies, the reliability of the strategy is confirmed. Finally, future improvements needed by GLD-CPRs are addressed.
Preparation of Latent Curing Agent for Epoxy Resin by Encapsulation Technology
Authors: Yang Xiaojun , Zhao Liyang , Li Qingyang , Ma Limin 
Published: March 2020

Abstract
The microcapsule-type curing agents DDM-PMMA and IZ-PU were prepared by solvent evaporation method and interfacial polymerization method, respectively. The surface morphology of the two microcapsules was characterized by SEM. The coating efficiency and latency were analyzed by DSC analysis of the one-component adhesive composed of the microcapsule-type curing agent and epoxy resin. Two encapsulation methods were compared in terms of hydrophilicity or lipophilicity of the core material, formation time of the microcapsules, coating efficiency and latency of the microcapsules.
Study on Fatigue Limit Test of TCS Stainless Steel
Authors: Ren Junlin , Li Qiang , Wang Binjie , Yin Yi 
Published: March 2020

Abstract
Material fatigue limit plays a vital role in the fatigue life of railway vehicle parts. According to the fatigue test method, the fatigue performance of TCS stainless steel used in railway rolling stock was studied in this paper. The corresponding fatigue limit calculation methods of lifting method and group method were given, and the P-S-N curve of TCS stainless steel under test conditions and fatigue limit under different survival rates were obtained. The results showed that the fatigue limit of TCS stainless steel was 176.43 MPa under 50% survival rate, 163.21 MPa under 90% survival rate, and 152.44 MPa under 99% survival rate. The results of this paper provide basic data for the application of TCS stainless steel in railway rolling stock.
Study on the Performance of Vertical Axis Wind Turbine with Two Sets of Blades
Authors: Peng Yixiang , Guo Yonghui , Wan Kui , Gao Ye 
Published: March 2020

Abstract
This paper investigated the impact of added auxiliary blades on the performance of vertical axis wind turbine through adjusting blade spacing and blade pitch angle by means of experimentation. The results show that a critical value of blade spacing affects the performance of turbine, and with the decrease of blade spacing, the output power coefficient of the turbine decreases but the automatic startup performance increases when under low tip speed ratio. In addition, the output power of pitch angle β was the largest when it was 3°, which increased by 3.9% compared with that of 0°. The power of pitch angle β was relatively close in the range of -3°∼5°.
Relation between Dynamic Characteristics and Parameters of a Two-degree-of-freedom Vibro-impact System with Multi-elastic Constraints
Authors: Yin Fengwei , Luo Guanwei 
Published: March 2020

Abstract
A mechanical model of mechanical vibration system with multi-elastic constraints was founded. Based on the multiple parameter and multiple objective cooperative simulation calculation, the three-dimensional parameter space was constructed by the key parameters such as constrained stiffness, excitating frequency and clearance threshold. The large data onto two-dimensional parameter bifurcation diagrams reflecting the correlation between dynamic properties and parameters of the model are obtained. The mode types, existing regions and bifurcation characteristics of periodic impact vibration of the system on the parameter plane of frequency and clearance are described with the change of constrained stiffness. Similarly, the three-dimensional parameter spaced consisting of mass ratio, or damping ratio and excitating frequency and clearance threshold are analyzed. The results show that the high mass ratio excites rich and wonderful periodic vibration, and different damping ratio determines, the bifurcation characteristics and the number of chattering impacts groups in the small frequency domain. The mode types and transition rules of the fundamental periodic impact vibration in small frequency domain and subharmonic impact vibration in high frequency domain induced by different parameters of the system are revealed.
Numerical Simulation on Cooling Process of Phase Change Cool Storage Device for Rail Vehicle Air Conditioning System
Authors: Wang Hongyu , Han Bing , Li Mengmeng , Zeng Xiao , Wang Suna 
Published: March 2020

Abstract
In order to face emergency situation of the rail vehicle air conditioning system, a cool storage device was designed. The device was made up of phase change paraffin and heat exchanger. For the purpose of optimum system design, the mathematic model of phase change and heat transfer in process of cool discharging was established, numerical simulation was finished. Discharging rate of cool and cooling capacity of the device was analyzed. According to the calculation results, the wind speed and air temperature had the greatest influence on the cooling effect, while the thermal conductivity had little effect on it.
Based on the Shipping Prosperity and Ship Renewal Decision
Authors: Xiang Jiale , Gan Xuezeng , Zhang Honggang 
Published: March 2020

Abstract
As the carrier of the shipping industry, the carrying capacity of the ship is determined by the state of the ship in a large extent, and affects the amount of related costs incurred in the operation of the ship. The timely renewal of the ship can not only keep the ship in good operating condition, but also guarantee the minimum transportation capacity of the shipping enterprise. This paper will study and analyze the relationship between shipping prosperity and ship renewal, to find the best ship renewal opportunity, provide the best ship renewal scheme for ship operation enterprises, to ensure that ships operate in the optimal state, and at the same time, ensure the continuous renewal of shipping capacity and create the greatest economic benefits for shipping enterprises.
Thermal-structural Coupling Researches on Transmission Shafting of the Intermediate Gearbox of a Certain Helicopter
Authors: Wang Ao , Hu Xiaozhou , Wu Minggui , Luo Cheng 
Published: March 2020

Abstract
To study the lubrication performance and structural strength of transmission shafting of the intermediate gearbox of a certain helicopter, applying theories of tribology and heat transfer, thermal-structural coupling simulations of the entire transmission shafting, which mainly consists of a spiral bevel gear pair, two bearings, are performed based on the software platform of ANSYS Workbench. Both steady-state temperature field and stress field are obtained, and influences of rotational speed, torque on the thermal-structural coupling effect are discussed.
Research on Automatic Spray Equipment of Thin Spray Support Technology for New Material in Coal Mine Roadway
Authors: Dong Huihui , Lou Andong , Zhu Jianguo , Min Fusong 
Published: March 2020

Abstract
Based on a new type of non-reactive polymer powder material for thin spray-on support technology in coal mine roadway, an automatic spray equipment for coal mine roadway thin spray-on support is designed and developed. It has Kinds of movements and motion trajectories. This paper introduce The technological basis and working principle of the equipment, design basis, and overall system composition of the equipment, which including: mechanical system, hydraulic system, and control system. Compared with the concrete spraying technology, the thin spray-on technology can reduce the material transportation volume by more than 90%, significantly reduce the labor intensity of workers, improve the construction efficiency and the construction environment. It is an ideal choice for closure and supporting for the future underground roadways.
Three Dimensional Carbon Supported Ultrasmall Fe2O3 Nanoparticles as Anode Material for Lithium Ion Batteries
Authors: Jieru Wang , Xu Junming , Zhang Linjuan 
Published: March 2020

Abstract
In this article, carbon nanotubes were grown on free standing multi-layer graphene sheet to form three dimensional carbon (3D-carbon) materials, and then used as support of Fe2O3 nanoparticles. Ultrasmall Fe2O3 nanoparticles were uniformly deposited on the surface of the 3D-carbon. Due to the synergistic effect of Fe2O3 nanoparticles and 3D-carbon, the electrochemical properties are higher than that of bare Fe2O3 material and multi-layer graphene sheet supported Fe2O3. Reversible capacity 528 mAh g-1 is maintained at a high current density of 500 mA g−1 after 50 cycles. This composite shows a stable cycling and high rate performance.
Study on the Preparation of Lifepo4 by Hydrothermal Method
Authors: Liu Y , Luo G Y , Gu Y J , Wu F Z , Mai Y , Dai X Y 
Published: March 2020

Abstract
A simple hydrothermal process combined with carbon coating is attempted to prepare nano particle LiFePO4 cathode materials for Li-ion batteries. A carbon coating process with glucose is used to make LiFePO4/C composites. The structure, morphology and electrochemical properties of the materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and constant current charge/discharge. The X-ray diffraction pattern indicates that the pure phase LiFePO4 material could be prepared at different reaction temperatures, and the pure phase LiFePO4 material could not be prepared with the reaction time of 6 h. SEM test shows that the dispersion of LiFePO4 particles become better with the increase of reaction temperatures and the morphology is more regular with the increase of reaction temperature. But when the reaction temperature increases to 200 °C, LiFePO4 particles reaggregate severely. As the reaction time increases, the particles of the sample gradually grow. The electrochemical performance indicates that the sample synthesized at 180 °C for 10 h has the highest specific capacity of 139.5 mAh·g−1 at 0.1 C. This study shows that proposed process can be a potential promising way to prepare high performance LiFePO4 cathode materials.
Assessment of Antifungal Activity of Aloe Vera Toothpaste against Candida Albicans
Authors: Thaweboon S , Thaweboon B 
Published: March 2020

AbstractHerbal products have been the basis for medical therapy and are noted as a form of alternative medicine. Modern medicine also employs the use of many herbal products for therapeutic purposes. Aloe vera is a medicinal herb whose mucilaginous gel is traditionally used to treat different diseases. It consists of the active compounds which include methylchromones, flavonoids, aloesin, aloe-emodin, sterols, amino acids, aloemannan, aloin, acemannan, aloeride, naftoquinones, saponin and vitamins. Aloe vera toothpaste, consequently, has been developed by the Thailand Institute of Scientific and Technological Research (TISTR) to fulfill a strategy of good oral hygiene. The aim of this study was to investigate the antifungal activity of aloe vera toothpaste againstCandida albicansin vitro. Toothpaste containing 10% aqueous extract of the aloe vera leaf was prepared by TISTR. The toothpaste solution was prepared by mixing 0.66 g of toothpaste in 1 mL of sterile deionizing water. The suspensions of 107cfu/mL (equivalent to 0.5 McFarland Standard) ofCandida albicansATCC 10231 and 2 clinical isolates were prepared and added to toothpaste solution. After 50 sec, the final solution was transferred to D/E neutralizing broth and cultured at 37 °C for 24-48 h on Sabouraud dextrose agar. Sterile distilled water was used as a control. Colony forming unit (CFU) was counted after incubation. The result showed that aloe vera toothpaste had a significant inhibitory effect against tested candida species compared with a control. In conclusion, result from the present study is scientific information to prove that aloe vera toothpaste could be assigned as natural toothpaste against candida infection. With proper tooth brushing, it is a simple manner, leading to good oral care.
Preparation of Nano-Graphite Oxide
Authors: Luo Xue-ping , Lai Qi 
Published: March 2020

Abstract
In order to get high yield of nano-Graphite oxide through raw materials of nature graphite, the preparation process of oxidation, expansion, and ultrasound smash were studied. It is found that the more intense of oxidation reaction is, the more crack the expanded graphite is, and more completely the expansion of the nano-Graphite oxide will be. The Large expansion volume of the nano-Graphite oxide can be more easily crushed into nano-Graphite oxide at the same ultrasonic time. And the longer the ultrasonic time is, the more the yield of nano particle size of expanded nano-Graphite oxide is. And the less ultrasonic time can get the smaller nano particle size. The result shows that the best process conditions of nano-Graphite oxide are as follows: Vsulfate acid: VNitrate acid = 5:1, m (fine graphite): m (Potassium permanganate) = 1:0.18. The expansion temperature is 950-1000°C, and ultrasonic time is 10h.
Surface plasmon resonance sensor based on core-shell metal nanorods
Authors: C Chau Y-F 
Published: March 2020

Abstract
A surface plasmon resonance (SPR) sensor based on core-shell metal nanorod arrays for ultra-sensitive refractive index sensing applications is proposed using three-dimensional finite element method. Simulation results show that the absorptance (A) of the proposed structure can be reached A=90.0% which is about 3.5 times enhancement compared to its solid counterpart (A=25.57%). Result shows that the sensitivity can be obtained as high as 700.00 nm/RIU (RIU is the refractive index unit). The proposed SPR sensor could be a desirable candidate for applications in nanophotonic devices.
Growth of graphene on stainless steel by chemical vapor deposition using soybean oil as a carbon source
Authors: Ruammaitree A 
Published: March 2020

Abstract
Graphene is a 2-dimension material which consists of carbon atoms arranged in a flat honeycomb lattice. Graphene has many outstanding properties such as high electron mobility, superb strength, and great flexibility. Although graphene film can be fabricated by economical method such as chemical vapor deposition, the utilization of flammable gas (such as methane, acetylene) in the graphene growth process is still dangerous therefore the safe flammable gas storage and gas line installation are needed. Soybean oil is available vegetable oil which contains carbon, hydrogen and oxygen. Utilization of soybean oil as a carbon source instead of hydrocarbon gas for graphene growth by chemical vapor deposition can avoid an explosion of flammable gas and save the installation cost of gas system. However, the presence of oxygen in soybean oil may obstruct the growth of graphene by chemical vapor deposition. Fortunately, annealing stainless steel with carbon at high temperature can eliminate oxygen from the surface. In this study, the growth of graphene on stainless steel by chemical vapor deposition using soybean oil as a carbon source has been study. The presence and quality of graphene are investigated by Raman spectroscopy. The morphology and element analysis are measured using scanning electron microscope and energy-dispersive X-ray spectroscopy, respectively.
Rubberwood sawdust filled natural rubber composites: effects of filler loading and zinc oxide content
Authors: Homkhiew C , Pianhanuruk E , Rawangwong S , Boonchouytan W , Numrat R 
Published: March 2020

Abstract
The aim of this work is to investigate the effects of rubberwood sawdust (RWS) and zinc oxide contents on mechanical properties of natural rubber (NR)/RWS composites. The curing characteristics of the composites were determined and the composites were vulcanized at 150°C for 10 min and a pressure of 1000 psi using a hot press machine. The properties of the composites such as tension, hardness and morphology were characterized. The increasing additions of RWS in range of 20-100 phr increased the minimum torque (ML), maximum torque (MH) and hardness of NR/RWS composites, but tensile strength and elongation at break of the composites decreased. Further, an increment of zinc oxide contents in range of 3-5 phr into the composites slightly affected the ML, MH, hardness and tensile properties. Therefore, the addition of zinc oxide 3 phr is recommended to achieve the properties of NR/RWS composites as well as saving cost.
Removal of fluoride ions from groundwater using surface-modified ultrafiltration membrane
Authors: Yanwachiragul W , Lohwacharin J , Sajomsang W , Singto S 
Published: March 2020

Abstract
Zeolitic imidazolate framework no.8 (ZIF8), a kind of metal organic frameworks (MOFs), has potential use in water treatment due to water stability. However, there are few studies of ZIF8/polyamide as a thin-film nanocomposite (TFN) membrane. Herein, a film on the surface of ultrafiltration membrane was generated with ZIF8 nanoparticles to fabricate the TFN membrane. Thus, the objective was to investigate feasibility of the ZIF8 membrane for fluoride removal from water. A scanning electron microscopy analysis demonstrates that the ZIF8 layer was successfully made on the UF surface. The ZIF8 layer rendered an increase in the fluoride rejection, probably through size sieving by small windows of the MOFs, compared to the virgin UF membrane, while sacrificed the water permeability. It is anticipated that reducing large voids between ZIF8 particles and thickness of the ZIF8 layer improve the fluoride rejection and water permeability.
Facile preparation of monolithic magnetic porous carbon acid catalysts via surface self-assembly method and their applications in conversion of xylose into furfural
Authors: Toumsri P , Auppahad W , Panpranot J , Chuenchom L 
Published: March 2020

Abstract
Furfural is a versatile chemical derived from pentosane-rich agricultural and forestry residues. Considered as an important platform chemical, furfural can be converted into valuable chemicals and biofuels. The furfural production from xylose was produced through the hydrolysis and subsequent cyclodehydration reaction of xylose sugar catalyzed generally by various catalysts containing SO3H. Nevertheless, their tedious multi-step preparation and the final catalysts usually in the form of fine powder make them difficult to be separated from the liquid systems after use, leading to time consumption for the industrial scale production. In the this work, novel magnetic porous carbonaceous acid catalyst (SO3H-MPBG) in the form of monoliths have successfully been prepared using sugarcane bagasse as scaffold via a self-assembly surface coating method from phloroglucinol/glyoxylic acid precursors with soft-template F127 and Fe3+ as a source for magnetic iron particles. Then facile subsequent hydrothermal sulfonation with concentrated H2SO4 at 180°C resulted in magnetic mesoporous carbon bearing SO3H group (SO3H-MPBG). The SO3H-MPBG was characterized by various techniques including XRD, FT-IR, N2 sorption analysis, elemental analysis, and VSM. A SO3HMPBG showed strong magnetism due to the presence of iron magnetic particles and possessed a BET specific surface area of 252.96 m2/g. The sample showed acceptable xylose conversion (86.13%) and furfural selectivity (55.70%) when performed at 170°C for 3 h using γ-valerolactone (GVL) as a solvent. Besides, the catalyst was easily separated after the catalytic tests using a magnet, confirming its magnetic stability.
Determination of radioactivities in gamma vulcanized natural rubber latex (GVNRL) for the assessment of radiological safety
Authors: Toyen D , Saenboonruang K 
Published: March 2020

Abstract
Due to great potentials of utilizing products made from gamma vulcanized natural rubber latex (GVNRL) in applications that require less use or less release of hazardous chemicals during rubber vulcanization, the radiological health risks in rubber producers/users caused by radioactivities from natural radioisotopes containing in GVNRL must be thoroughly determined and evaluated. As a result, this work determined the activity concentrations of 226Ra, 232Th, and 40K in GVNRL samples that were pre-vulcanized with 12-kGy and 24-kGy gamma irradiation using gamma spectroscopy. The results showed that the average radioactivity concentrations (± standard deviation) of 226Ra, 232Th, and 40K in 12-kGy (24-kGy) GVNRL were 30.8±1.5 (31.2±2.7) Bq kg-1, 89.1±0.6 (89.7±0.4) Bq kg-1, and 95.4±1.6 (93.2±2.2) Bq kg-1, respectively. These results implied that GVNRL vulcanized with 12-kGy and 24-kGy gamma irradiation had statistically similar radioactivity concentrations and higher gamma doses did not result in increasing radioactivies. Furthermore, when compared these results with the values from nonvulcanized natural rubber latex (NRL), of which the activity concentrations of 226Ra, 232Th, and 40K were 29.9±1.2 Bq kg-1, 95.2±1.1 Bq kg-1, and 96.2±1.0 Bq kg-1, respectively, it could be concluded that the use of gamma irradiation for rubber vulcanization did not statistically increase or change activity concentrations of the mentioned radioisotopes, thus, it is radiologically safe for related personnel to work or use GVNRL products.