bluuebunny/crossref_metadata_2025_split huggingface dataset:
Printing temperature effects on the structural and mechanical performances of 3D printed Poly-(phenylene sulfide) material
Authors: Magri A El , Vaudreuil S , Mabrouk K El , Touhami M Ebn 
Published: April 2020

Abstract
Fused Deposition Modeling (FDM) is the most popular and widely used additive manufacturing techniques for plastic materials. In FDM, the Z-height of the object is achieved by depositing extruded polymer layer upon layer. To reduce the time and cost of printed parts requiring specific properties, many processing parameters can be adjusted to optimize the FDM process. Among those is the nozzle temperature. In this study, Poly-(phenylene sulfide) (PPS) was chosen because of its mechanical performance, making it attractive for high-performance applications. In this work, the impact of printing temperature on the mechanical and structural properties of printed parts was carefully tested. Results show that a 340°C printing temperature yield the parts with the highest tensile properties, with a degree of crystallinity superior to as-received PPS.
Dosimetric investigation for the new BEBIG cobalt 60 source used in brachytherapy using Monte Carlo N-Particles eXtended code (MCNPX)
Authors: Elboukhari S , Yamni K , Ouabi H , Bouassa T , Mlouk L A 
Published: April 2020

Abstract
The purpose of this work is to calculate the parameters of the 60Co-source model: Co0.A86 newly introduced to the HDR brachytherapy, and to validate the MCNPX code in Monte Carlo investigation, the radial dose function, and function of anisotropy are calculated in water as recommended in the report of HEBD working group (AAPM&ESTRO). The results obtained in this study agree will with the data published in previous studies.
Design of high-performance perovskite solar cells adapted to the tandem configuration
Authors: Laalioui Saida , Alaoui Kawtar Belrhiti , Assali Kassem El , Ikken Badr , Outzourhit Abdelkader 
Published: April 2020

Abstract
Thin film based solar cells offer the added advantage of presenting a low temperature coefficient of power and are usually suggested for hot climates. Perovskite solar cells have reached today a record efficiency of 25.2%. In addition, they demonstrated a great compatibility to be used as the top cell in tandem cells, either with CIGS, CZTS, perovskite or silicon heterojunction (HIT) as the bottom cell. The purpose of this work is to design and analyse the selected planar perovskite solar cells (PSCs) reaching high power conversion efficiency and stability with layers configuration of glass substrate/FTO/TiO2/MAPbI(3-x)Clx/CuSCN/Au, using the SCAPS-1D software. The thickness of MAPbI(3-x)Clx and FTO was varied from 0.4 μm to 1.4 μm and from 0.02 μm to 0.5 μm respectively and the best results are observed at 1.1 μm of perovskite absorber and 0.05 FTO μm. The best performances of this device architecture, calculated with SCAPS software are cell efficiency of 27.79% with an open circuit of 1.2 V, a short circuit current of 26.04 mA/cm2 and a fill factor of 88.85%.
Noncovalent functionalization of carbon nanotubes by polyaniline molecules: Raman analysis
Authors: Chenouf Jamal , Boutahir Mourad , Fakrach Brahim , Rahmani Abdelhai , Chadli Hassane , Rahmani Abdelali 
Published: April 2020

Abstract
Polyaniline/single-walled carbon nanotube composite (PANI4@SWCNT) has been studied theoretically by means of Raman spectroscopy calculations. We evidence that the structural organization of the nanohybrid systems depends on the diameter of carbon nanotubes. To study the stability of PANI4 molecules encapsulated in the cavity of the SWCNTs, the optimum configurations of PANI4 inside carbon nanotubes are derived from minimum energy calculations using a convenient Lennard-Jones expression. We discussed also two important Raman features of SWCNTs before and after encapsulation of PANI4 including the G-band and the radial breathing mode (RBM) taking into account its metallic or semiconducting character. The G-band shift suggests a significant charge transfer between the PANI4 and the nanotubes.
Enhancement of localized surface plasmon resonances of silver nanoparticles array upon the presence of graphene coatings: LSPR biosensor
Authors: Barghouti Mohamed El , Akjouj Abdellatif , Mir Abdellah 
Published: April 2020

Abstract
We study, in this article, the resonance of localized surface plasmon (LSPR) on silver nanoparticles (AgNPs) deposited on a glass substrate and coated with a graphene. The resonance peaks in the absorption spectra of the nanostructure SiOx/AgNPs/Graphene, show significantly different profiles such as the thickness of the graphene, and the refractive index of the surrounding environment which is, gradually, varied. Numerical simulation reveals that movements in plasmon resonance peaks result from coupling between the AgNPs networks and the covering graphene layer. In addition, the LSPR modes shift to red from 412 nm to 548 nm when the thickness of the graphene layer deposited on silver nanoparticles changes from 0.34 nm to 9 nm. Light coupled with LSPR modes propagating along a AgNPs-graphene interface is calculated and compared to a conventional AgNPs-based LSPR biosensor. The result of the comparison depicts an improvement in the sensitivity of the biosensor from 26 to 106 nm/RIU.
Effects of refractory nitride reinforcements on the microstructure, densification and microhardness of Ti6Al4V-based binary composites produced by spark plasma sintering
Authors: Abe J O , Popoola A P I , Popoola O M , Ajenifuja E 
Published: April 2020

Abstract
The effects of different refractory nitrides: aluminium nitride (AlN), titanium nitride (TiN) and hexagonal boron nitride (h-BN) reinforcements on the microstructure, densification and microhardness characteristics of spark plasma sintered Ti6Al4V-based binary composites were studied. The microstructure was examined by optical microscopy, densification was evaluated according to the method of Archimedes and the microhardness of the sintered composites was measured by Vickers microhardness tester. The SPS technique was successfully used to consolidate Ti6Al4V powder and 3 wt.% nanoparticles of AlN, TiN and h-BN respectively. The binary composites produced attained nearly full theoretical densification (98.22 to 99.54%) due to enough diffusional mass transport ensuing in solidly bonded compact of the matrix and the refractory nitride reinforcements. Ti6Al4V-3h-BN composite gave the optimal combination of relative densification and microhardness values of 99.54% and 7.03 GPa which exceeds 200% that of the monolithic alloy and about 48% superior to both composites with TiN and AlN reinforcements.
Study on application of adhesives for Carbon Fiber Composites connection in High-speed Rail
Authors: Yan Jiangyi , Deng Qian 
Published: April 2020

Abstract
At present, the high-speed train mainly made up of carbon fiber composites adopts a new flame-retardant multi-material system. It is necessary to select adhesives for the Adhesive bonding structures of different materials in order to meet the overall technical and performance requirements of high-speed trains. Through this research, mechanical performance data of several structural adhesives and sealant adhesives are obtained when they are bonded to the high-speed trains with carbon fiber composite material as the main body. Finally, the optimum adhesives for bonding different material systems in the high-speed trains are determined under different operational aging environments, which also provides data support for the formulation of connection specifications for carbon fiber reinforced composites in the field of high-speed railway. In addition, a multi-dimensional data reduction method is proposed for the analysis of sealant performance data, which is very helpful for the future analysis of big data of adhesives.
Life prediction of multi-pit-crack interaction in pressure vessel
Authors: Zijie Zou , Zhongbao Qin , Qi Liu 
Published: April 2020

Abstract
During the service of pressure vessel, there are many kinds of structural damage. The main defect is pitting caused by corrosion of loaded materials, cracks are formed because of stress concentration in the pit position, and crack propagation leads to crack leakage. As an important parameter to characterize cracks, fatigue life is widely used in engineering to judge the safety and reliability of mechanical structures. In this paper, based on the two-parameter pit-crack model, the fatigue life of pressure vessel with multiple pits-cracks is discussed by using ANSYS finite element analysis software. The results show that the fatigue life of pressure vessels decreases with the existence of multiple pits and cracks, but with the increase of pit-crack spacing, the effect decreases gradually until it returns to a stable state. The effect of pit parameters and the ratio of crack length to depth on fatigue life has obvious interval effect. This paper can be used as a reference for failure assessment of multi-pit-crack pressure vessels.
Development of Decision Support System for Solving the Machine Selection Problem in an Intermittent Manufacturing System Design
Authors: Buathong P , Vilasdaechanont A 
Published: April 2020

Abstract
Capacity planning, which is integral to resource selection and allocation, is an important task in manufacturing system design. As budget is limited, investment in resources must be done carefully and appropriately in order to achieve desired capacity and system efficiency. One of the most expensive and valuable resources in the manufacturing system is machinery. Therefore, selecting an appropriate machine is of high significance. Among many types of manufacturing systems, intermittent manufacturing system is complex, yet flexible. The intermittent manufacturing system enables manufacturers to produce multiple products using multiple processes and multiple machines. The system comprises a network of multiple types of multi-process machines. A machine selection problem in the context of the intermittent manufacturing system is a delicate process, as it must correspond appropriately with production complexities. To alleviate this problem, we develop a decision support system for solving the machine selection problem in an intermittent manufacturing system design. We study several manufacturing systems producing multiple types of products with various multi-process machines to lay out the framework. This decision support system consists of four main parts, namely; data entry, data conversion, optimization model and report. To solve the machine selection problem, an optimization technique is used to identify the optimal number of machines and the allocation of production process of each machine. The objective of this optimization problem is to minimize total production costs (machine cost and operating cost) while maintaining production capacity and other production constraints. The decision support system is developed for and validated with the manufacturing company.
Adaptive sliding mode control of electro-hydraulic servo system based on RBF network
Authors: Zhou S H , Wang H , Li J , Lan L Y 
Published: April 2020

Abstract
In order to solve the steady-state error in position tracking control for electro-hydraulic servo universal testing machine, caused by uncertain parameters in the system model, an adaptive sliding mode control strategy based on RBF neural network is proposed for this situation. This paper utilizes the adaptive ability of RBF neural network to improve the control quality of the electro-hydraulic position servo system. The strategy has three parts: the equivalent control, the reaching law control and the compensation control based on RBF network. Simulations verify that the control system can track the reference curve well with unknown parameters.
Researches on suppliers selection based on improved AHP-TOPSIS method
Authors: Wang Xinchen , Ma Yanhua , Gao Pengfei , Zhai Lu , Gu Bing 
Published: April 2020

Abstract
Selection of supplier can be considered as the significant strategic decision for company’s competitive advantage. Generally, the scales of criteria for selection were used to evaluate the performance of suppliers. But the traditional criteria are limited to reflect the comprehensive ability of the suppliers. Meanwhile, the quantitative scale, which is used to evaluate the suppliers, is too subjective to describe the real station of suppliers. Therefore, the improved analytic hierarchy process (AHP) is conducted to reanalyze the criteria and distribute the weight for each criterion. Technical for order preference by similarity to ideal solution (TOPSIS) used to calculate the relative proximity for each supplier and rank them based on the corresponding information. Finally, the calculate process is programmed by Excel VBA and MATLAB respectively. The two results show the same ranking order, which verify the improved AHP-TOPSIS method can effectively guide company to select supplier.
User requirement and usability testing framework for information system development: case study of financial institution
Authors: Thatawong P O , Jiamsanguanwong A 
Published: April 2020

Abstract
Due to the fact that financial institution has its limited competency in developing the information system, outsourcing is often used to support the information system development which same as the case study of the issuing documents system in financial institute. The financial institution has received customer’s complaints regarding the mistake of issuing documents caused by the system functionality and human error in operations. Thus, the purpose of this study is to design framework of user requirement and usability testing for information system development to prevent the error in system functionality and set some quality checking process of documents before delivery to customer to prevent mistakes from human error in work operation. System Usability Scale showed that after proposed the framework of user requirement and usability testing to employees who related with the system development, their level of satisfaction toward the framework and non-framework of user requirement and usability testing raise up to 30.93% and 20%, respectively. After six months of implemented quality checking process of documents revealed zero complaints from customers regarding to the mistake of issuing documents.
Research on welding deformation of side beam of freight train bogie
Authors: Liyana  , Suliang  , Wangwen  
Published: April 2020

Abstract
The welding deformation directly affects the production quality and service life of the bogie, so controlling welding deformation is an important engineering problem in the production process of the bogie. In this paper, the side beam of freight train bogie is taken as the research object, the heat source of the local joint mode is checked based on the thermal elastic-plastic theory and the plastic strains are extracted to establish the inherent strain database with the welding simulation software.Then, the welding deformation of the whole side beam is carried out by using the inherent strain method based on thermal elastic-plastic theory. By quantitative analysis of the displacement deformation, the results show that simulation numerical results are similar to factory experimental data. At the same time the rationality and reliability of the established inherent strain database are verified. It is also proved that the inherent strain method based on thermal elastic-plastic theory is a fast and effective way to predict the welding deformation, which provides technical support for the prediction and control of the welding deformation of the whole frame of the fast freight train.
Research on Vehicle Exterior Fire Suppression Techniques
Authors: Deng Gaoshou , Lin Runing , Shi Xiaoxiang , Zhang Wen , Chen Hui 
Published: April 2020

Abstract
This paper studies automatic vehicle exterior fire detection and suppression techniques. The main difficulties include: 1) complex and changeable environment outside the vehicle; 2) low sensitivity of the fire detector; 3) quick dissipation of fire extinguishing agent in the open space outside the vehicle; 4) extinguishing agent nozzle blocking due to dust and sand. This paper selects a special ultra-fine dry powder fire extinguishing agent for automobiles to design the protective nozzle and to study the automatic detection controller with the functions of condition monitoring and fault diagnosis, with an aim to improve fire suppression reliability. Based on the virtual and real vehicle tests, it is verified that the fire extinguishing effect of the designed system meets the design requirements.
Design path of hybrid bean planting machine based on human-machine symbiosis aesthetics theory
Authors: Zhao Aili , Guo Zhanbin , Wang Liming , Qu Qingfeng , Qin Haibin 
Published: April 2020

Abstract
Based on the theoretical study on the creative design theory of hybrid bean planting machinery, and combined with the aesthetic characteristics of hybrid bean planting machinery modeling of perceptual engineering-promoted symbiosis mechanism, an innovative design path based on man-machine symbiosis aesthetics of hybrid bean planting machinery was constructed to realize the innovative design style of hybrid bean planting machinery under the background of intelligent age, and thus improving the design level of agricultural machinery finishing.
Structural analysis of performance optimization of high g accelerometer chip
Authors: Chen Jiajun , Li Haojie 
Published: April 2020

Abstract
Accelerometers based on micro-electromechanical systems (MEMS) technology are widely used due to their high cost performance and easy integration. However, there are still weaknesses in the mutual limitation of sensitivity and natural frequency in ordinary MEMS acceleration-sensitive structures. In this paper, a new type of piezoresistive acceleration-sensitive structure is optimized. The specific parameters are optimized by finite element simulation. Finally, the natural frequency of the sensitive unit reaches 2.039MHz and the sensitivity reaches 0.546μV / g.
Design and terrainability analysis of a novel mobile robot with variable-diameter wheels
Authors: Gao Feng , Zeng Wen , Jiang Hui , Xu Guoyan 
Published: April 2020

Abstract
Mobile robots are usually demanded to enter into unstructured terrain. Thus, terrainability of a robot is specially important in cluttered environments. A novel mobile robot with variable-diameter wheels is designed here. This robot can adjust its attitude by variable wheel diameters to improve its terrainability. For terrainability, stability and obstacle-surmounting capability of the robot are studied. Furthermore, variable wheel diameters’ effects on these performances were researched. For lateral and longitudinal stabilities, parametric relationships between the maximum slope that the robot can climb and stability requirements were obtained. To avoid stability failures, appropriate failure criterions were proposed. Stability of the robot can be enhanced by changing wheel diameters. The obstacle-surmounting performances of front and rear wheels were analyzed by building two quasi-static models. The results showed that increased wheel diameters enhanced the obstacle-surmounting height. The analytical calculations and the simulations were compared. The simulations verified the reliability of the theoretical calculations. Based on tip-over failure criterions, appropriate strategies can be used to enhance the stability. These analysis presented also can provide theoretical basis for performance optimization design of the robot.
Electrical control design of CNC equipment fault based on part quality
Authors: He Yi , Chen Xuezhen , Zhao Guobo , Li Ying 
Published: April 2020

Abstract
Aeronautical structure component has high value and complex shape, normally manufacturing by advanced five-axis CNC machine tools, but sometimes random failures also occur. Therefore, this research focuses on how to predict the failure, imply redundancy design technique and minimize part quality risk as much as possible. This article first analyses quality risk caused by device failure in manufacturing and introduces several axis movements during alarm occurring, then studies the influence of accuracy in movements and optimizes by the electrical and external power grid redundancy design. At last this article carries out engineering verification though practice application and reduces the quality risk from device failure in order to prepare quality insurance system in intelligent manufacturing.
Backstepping DTC control of PMSM with robust adaptive law
Authors: Zheng Xiaoming , Xue Lei , Wang Peng , Li Jia , Shen Zeyuan 
Published: April 2020

Abstract
The traditional direct torque control (DTC) of permanent magnet synchronous motor (PMSM) is characterized by the feature of inconstant switching frequency and large ripples of flux and torque which is due to the hysteresis controllers adopted in the system. Besides, the modification of motor parameters, especially the rise of stator temperature, and load torque disturbance further leads to the speed steady-state error and fluctuation. A novel DTC method of interior PMSM based on the adaptive backstepping control with load torque and stator resistance identification is proposed in this paper. In order to reduce the ripples of the traditional DTC, a speed backstepping controller is designed to replace PI speed controller, and torque and flux backstepping controllers are designed to replace torque and flux hysteresis controllers in this algorithm. Owing to the real-time and accurate estimation of the stator resistance and load torque, the control variables can be instantly and simultaneously modify to ensure the accurate and fast response of the speed. The effectiveness and correctness of the presented method are verified through multiple simulation experiments, and the results indicate that the dynamic and static performance of the PMSM can be significantly improved by using the method.
The Numerical Analysis to Gas-Liquid Separator used in On-orbit Refuelling Mission
Authors: Li Wen , Guo Lei , Liu Jintao , Li Yong , Chen Lei 
Published: April 2020

Abstract
In the process of on-orbit refuel, the gas-liquid separator needs to separate the pressurized gas from the propellant, and discharges the gas out of the tank in the process of the tank refilling by propellant. In this paper, the gas-liquid separator has been developed, which could effectively separate the gas-liquid under microgravity conditions. The numerical analysis result shown that the stability of gas-liquid separation was the key characteristics, which was closely related to the geometric parameters of the fluid domain.