bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of low temperature transportation of 0#diesel oil in North China
Authors: Shujie Zhi , Hongjun Dong , Jianxin Yang , Hui Xiong , Xiuguo Cui , Yakun Niu , Shiyao Peng , Yang Du , Yubin Wang 
Published: July 2020

Abstract
Wax deposition in diesel transportation pipe at low temperatures is one of the harassing problems faced by the diesel transportation companies. In winter, the temperature is very low and the demand of diesel is increasing greatly in northern region of China. This work is focused on proposing a new method to transport diesel at low temperature, by analyzing the operating process of diesel transportation, studying the characteristics of the diesel wax deposition process in pipe by experimental measurements and ensuring the safety of diesel transportation at low temperature. The new diesel transportation method at low temperature built up some key parameters about the process of diesel entering to pipeline and achieved normal operation of the 0# diesel transportation system in winter. This achievement has been added into the operating regulations to promote the application of refined oil pipelines in the northern region.
Application of Pure Water Process in Chemical Industry
Authors: Jian Wu , Lei Wang , Yuan Zhuang 
Published: July 2020

Abstract
Abstract The effluent quality of fine chemical pure water equipment is related to people’s production and life. Fine chemical has very high requirements. Water for chemical industry refers to chemical reagents, fertilizers and fine chemicals, cosmetics, electric locks, battery manufacturing processes, pure water, textile printing and dyeing processes. These all need softened water and desalinated pure water. This paper reviews the use of pure water technology in the chemical industry, and analyzes the advantages of these processes.
Simulation of Coal Water Slurry Gasification based on Aspen Plus
Authors: Xie Ya’nan , Fu LI 
Published: July 2020

Abstract
Based on the description of the gasification process, the suitable thermodynamic model and the components involved in the simulation are selected, and the Aspen Plus is used to analyze the water-coal slurry gasifier. The simulation results are compared with the design data, and the influence of different parameters on the gasification of coal water slurry is studied, and the causes of different effects is analyzed.
An innovative model for coal seam gas release and flow and its application in simulation of water-jet slotting enhanced gas drainage
Authors: Qin Xuqian , Li Honglian , Tang Jiren , Qin Johnny 
Published: July 2020

Abstract
In order to better understand the mechanism of water jet slotting in enhancing gas drainage, based on the Langmuir equation, we constructed an innovative model to simulate the gas release and flow law. The simulation results show that the pressure in the coal seam of the slotting case reduces faster than that without slotting. At 21 day, the gas flowrate from the slotting case is 52% larger than that of without slotting. The gas desorbed from the coal seam not only flows to the borehole but also flows to the rock strata. The decompression and venting area starts near the borehole and gradually extends to the whole area.
Application of Self-made Rapid Membrane Testing Machine in Detection of Pure Water Permeability of Ultrafiltration Membrane
Authors: Guo Linyuan , Rong Yan , Feng Shichun , Peng Yunyan , Jin Dong 
Published: July 2020

Abstract
Ultrafiltration membrane detection plays an important role in many industries due to its superior performance. But Chinese testing film industry development is more chaotic, testing indicators are not uniform. We designed a rapid membrane detection machine to detect the key properties of nanofiltration membrane or ultrafiltration membrane, such as water flux, desalination rate. This paper proposed a rapid detection of the water transmittance of ultrafiltration membrane under different pressure. It is found that the rapid membrane detection integrated machine can quickly detect the membrane related indexes, especially the key performance indexes such as desalination rate and water transmittance, and the detection efficiency can be more than doubled.
Economic Analysis of the Combined Heating System of Solar Collector and Gas Boiler
Authors: Zhou Hengchao , Li Guangpeng 
Published: July 2020

Abstract
The combined heating system of solar energy and gas-fired boiler is designed, the mathematical model of comprehensive heating cost is established, the suitable solar collector area is determined, three typical operating conditions of complex heating system are analyzed, and the consumption of various heating fuels is discussed. The results show that the efficiency of condensing boiler is more than 15% higher than that of non-condensing boiler.The combination of solar heating and gas-fired boiler has the most energy-saving heating effect, which can save more than 50% fuel compared with the boiler running alone.
Theoretical study on Reaction Mechanism of methylene amidogen H2CN with OH radical
Authors: Pang Jing-Lin , Wang Yue-Mei , Zhang Xian-Ming , Hua Yu-Peng , Wu Zhen , Ding Yi-Hong 
Published: July 2020

Abstract
We performed the theoretical potential energy surface investigation on the mechanism of H2CN + OH at the CCSD(T)/6-311++G(2df, p), G3B3, CCSD(T)/aug-cc-pVTZ and CCSD(T)/aug-cc-pVQZ single-point levels using the B3LYP/6-31++G(d, p), BH&HLYP/6-31++G(d, p), and QCISD/6-311++G(d, p) optimized geometrie. We found that two reaction channels were feasible: 1) the quasi hydrogen abstraction of H2CN by OH to form product HCN + H2O via NC(H)H…OH, and 2) the addition elimination to form HCN + H2O.
Research on water footprint of main crops production in Baoding, China
Authors: Deng Shen , Mou Siyu , Liu Huifang 
Published: July 2020

Abstract
Based on the monthly meteorological data and basic agricultural data of Baoding Meteorological Station, this paper uses the Penman formula combined with CROPWAT software, and the gray water footprint calculation manual to calculate and analyze the production water consumption coefficient and production water of the main crops in Baoding in 2018. The results show that the water consumption coefficients of the main crops in Baoding city are cotton, peanut, rice, wheat, soybean, corn and vegetables. The water requirement of wheat in the whole growth period is mainly blue water, and the corn water requirement is mainly green water; the gray water footprint of all crops is greater than the blue water footprint. In 2018, the total production water footprint of major crops in Baoding was 65.31×108m³, of which the blue water footprint was 18.93×108m³, the green water footprint was 13.06×108m³, and the gray water footprint was 33.31×108m³. The sum of the blue water and gray water footprints is much larger than Baoding’s average available water resources, and the regional water shortage is serious. Therefore, Baoding should further optimize the agricultural planting structure in order to protect the water resources and environment, and at the same time promote the reduction of pesticides and fertilizers to increase efficiency.
Review of route choice based on prospect theory
Authors: Lang Guoling 
Published: July 2020

Abstract
In the face of the traffic system with uncertainty, people often take on the characteristics of the bounded rationality, there is a certain degree of uncertainty, the application of prospect theory has some applicability to the modeling of route choice decision behavior. This paper reviews the development course of prospect theory, then expounds the formula principle of prospect theory and the improved cumulative prospect theory, introduces the research status at home and abroad and makes a certain comb and summary.
Effect of Equivalent Ratio Variation on a Two-Stage Distributed Combustion
Authors: Komonhirun Seekharin , Yongyingsakthavon Pisit , Tanchatchawan Songrit , Nonthakeaw Udomkiat 
Published: July 2020

Abstract
Distributed combustion is a recent technology that has a feasibility to apply on the industrial scale. It provides relatively low combustion temperature with rather uniform distribution and very low emission (NOx). The two-stage distributed combustion system is established to reduce the complexity of operating in the industrial application. The operation range of this combustion system is governed by the equivalent ratio of the first and second-stages of combustion. This research is attempted to study the effects of equivalent ratio and to identify the operation range of the combustion system. There are two stages in this experiment: 1. To set up using a diesel combustor (first-stage) 2. To use an LPG distributed combustor (second-stage). Part of the aim of this project is to improve the efficiency of the single-stage diesel combustor. The air to fuel ratio of the first-stage combustor is controlled to provide the 5% excess oxygen for the second-stage combustor. The equivalent ratio of the second-stage is varied as 1, 0.9, 0.8, 0.7 and 0.6. The results have shown that stoichiometric distributed combustion yields the highest outlet temperature and first and second law efficiency. The temperature is decreased when reducing the equivalent ratio. Finally, this research also provides the formula that can be used to determine the appropriate operating range in the term of A/F for the two-stage distributed combustion system conveniently applied to the single-stage available in the industrial.
The Potential Study of Coffee, Acacia Wood and Corn Cob Residues to produce Biomass Pellets Fuel
Authors: Kasantiukl Benya 
Published: July 2020

Abstract
The objective of this research is to study the technical and economic feasibility of biomass pellet production from coffee, corncob and acacia wood residues for using as alternative energy. The biomass pellet in this research was produced by mixing three residues with the amount of tapioca starch not more than 20% by mass. The fuel properties of pellet were analyzed according to PFI and ASTM standards. The test results showed that the heating value of the pellet from coffee, acacia wood and corncob residues are 23.56, 20.43 and 19.46 MJ/kg, respectively. The moisture, ash, and durability index are 0.15-0.43, 0.954-0.957, and 95.37-98.52 %, respectively which are according to the standard. The bulk density is 221.04-277.93 kg/m3. The economic feasibility of pellet production was analyzed using Net Present Value (NPV), Reduction Rate (RR) and payback period (PB). The analysis results show that the production of biomass pellets from the residues of coffee, acacia wood and corncobs are economically feasible with RR = 27.56, 17.88, 14.61%, NPV=186,837 ฿, 91,684 ฿, 62,119 ฿, and payback period = 4 years and 7 months, 5 years and 4 months, 6 years and 8 months, respectively. Moreover, the sensitivity analysis results show that the most influential risk factors of the pellet production are fuel price and the quantity of fuel produced daily, followed by labor wages, production days a year, and price of machines.
Influence of Soot Contamination in API CI-4 Engine Oil on Four-Ball Metallic Wear Using Electron Microscopy Image Analysis
Authors: Oungpakornkaew Pitchaporn , Rungsritanapaisan Panyakorn , Karin Preechar , Tongsri Ruangdaj , Tanprayoon Dhritti , Hanamura Katsunori 
Published: July 2020

Abstract
Engine lubricant has an important role in decreasing friction and the wearing of moving parts in the engine. However, soot contaminated in engine oil could change chemical and physical properties that affect the lubricant oil operation. Soot particles were simulated using carbon black in order to eliminate the effect of metallic ash and unburned hydrocarbon, which contained in particulate matter. The carbon black was blended in CI-4 lubricating oil. The investigation of metallic wear was associated with the use of a four-ball wear test. The amount of wear was compared by measuring the wear scar diameter of the worn surface on the steel balls. Scanning electron microscope (SEM) and confocal laser scanning microscopy were used for characterizing wear scar and surface roughness, respectively. In addition, the evidence of lubricant additive elements was detected on the wear surface by Energy Dispersive X-ray analysis (EDX). This research found that engine oil with soot contamination could lead to increasing amounts of abrasive wear by 83% and has approximately 1.1% larger wear scar diameter.
Biodiesel Fuel (BDF) Synthesis by using Ion Exchange Resin Based on Ultrasonic Irradiation and Its Application
Authors: Zhu Ning , Kuo Mingchi , Hsin Han Chung 
Published: July 2020

Abstract
Ultrasound irradiation with NaOH proved an important method in catalyst to synthesize BDF. However, the synthesis of BDF remains a major challenge since a large quantity of water is needed to wash the BDF after it is produced. It is now well established from a variety of studies, that solid catalysis does not need a large quantity of water to wash the BDF after its production. The concept of zeolites is used as solid catalysts to synthesize BDF and BDF and its ratio yields up to 62%. This study uses ion exchange resin (henceforth, IER) as the catalysts for BDF production. Firstly, this research examines the emerging role of IER in the increase of its basic characteristics. Secondly, the prepared IER is characterized using SEM and X-ray diffractometer. Thirdly, the BDF synthesis experiment is carried out using the prepared IER based on ultrasonic irradiation. Finally, diesel engine performance test is carried out to investigate the thermal efficiency and exhaust gas concentration. The current study found that BDF yield ratio reached 44.4% when IER was prepared under the condition of 6mol NaOH preparation.
Acoustic Power Prediction of High BPR Turbofan Engine with Chevron Nozzle during Take-off and Landing
Authors: Ujjin Rapee , Ngaongam Choosak , Phoomee Chatmongkol , Kanabkaew Jirantanin 
Published: July 2020

Abstract
Aircraft noise is a major cause of noise pollution around the vicinity of an airport. Jet noise from engines is a common condition, which has considerable impact on overall sound levels. Adding chevron pattern at the fan nozzle is one of the noise reduction enhancements found in current turbofan engine design features. This paper aims to study the power level of sound created in jet shear from the combination of ambient stream, fan and exhaust gas. Computational fluid dynamic modelling of a high bypass turbofan engine with a round shape and chevron nozzle were carried out during takeoff and landing conditions. It was found that during take-off, the acoustic power level of the engine without a chevron nozzle was 105.95 dB, while the chevron nozzle was capable of reducing the sound level to 43.57 dB. During landing, the sound level of the round shape and chevron nozzle model were 145.77 dB and 47.51 dB, respectively. The turbulent intensity area at the fan cowling nozzle, where the ambient air stream and bypassed air from the fan mixed together, produced the highest sound power level. Therefore, slower aircraft speed during final approach produced a higher noise level than during take-off due to higher turbulent intensity and larger jet shear area around the high bypass fan cowling nozzle. The chevron pattern nozzle was capable of reducing turbulent intensity, which in turn reduced the acoustic power level.
Determination of Dynamic Loads from the Road Surface Acting on the Chassis by Experimental Methods
Authors: Van Luong Van , Quang Nguyen Thanh , Quan Le Hong , Anh Le Van , Hoa Tran Phuc , Nguyen Xa Hoi , Tran Van Tuong 
Published: July 2020

Abstract
Chassis is the main structural component of an automobile, which is subjected to the full weight load being suspended. In the process of moving, the vehicle can both move and cut the tree while moving and sweeping the garbage as well as moving water. During the operation,the chassis is subject to dynamic loads depending on the driver and road conditions. The variation of dynamic loads causes fatigue failure to reduce the life of the chassis. Therefore,the determination of dynamic loads as input for chassis durability problem is necessary. This paper presents the research results on the determination of dynamic loads from the road surface acting on the chassis of multipurpose forest fire fighting vehicles by experimental methods. Experiments are performed when vehicles are moving on forest roads, under the actual working conditions of the vehicle.
The Effect of Road Surface Roughness to Recommended Speed of Vehicles
Authors: Nguyen XaHoi , Nguyen ThanhQuang , Hoa Tran Phuc 
Published: July 2020

AbstractRoad safety is one of the major concerns of the transportation system planners and managers in any nation. The principle goal of road safety is to reduce the frequency and severity of traffic accidents. The design and manufacturing of high-quality road directly play an important role in achieving better road safety. This research presents the model describing the relationship between road surface roughness with the vehicle’s recommended safe velocity. The result shows that the road surface roughness measured by the International Roughness Index (henceforth IRI) is indirectly proportional to the vehicle’s recommended safe velocity. In particular, if the recommended safe velocity is 100 km/h, the surface roughness IRI should not exceed 1.9 m/km. An implication of this is the possibility that using the simulation on MATLAB Simulink software should have the appropriate IRI concerning the designed speed.
Aerodynamics, Stability and Control Analysis of Tactical Solar Power UAV
Authors: Kampoon J , Jiajan W , Klongtrujrok J 
Published: July 2020

Abstract
This paper addresses the fundamental aerodynamics, stability, and control analysis of a solar power Unmanned Aerial Vehicle (UAV) as a part of the preliminary design stage. The tactical solar-powered UAV addressed in this paper is primarily developed for intelligence, surveillance, and reconnaissance (ISR) missions at low altitude. Moreover, such design also has a dual-use capability, which could be utilized in both military and civilian domains. The aerodynamic characteristics of the UAV are obtained from both computational fluid dynamics analysis technique and the wind-tunnel testing at the design operating Reynolds number ranging from 1x105 – 4.5x105. The fundamental aerodynamics coefficient consists of lift, drag, and pitching moment variations versus the angle of attack. The stability and control analysis was carried out based on the small disturbance theory in correlation with the XFLR5 software. The results show that the tactical solar power UAV design could achieve high aerodynamic efficiency at a 4-degree angle of attack which is corresponding to the lift-to-drag ratio of 20.05. Also, the analysis results confirm that the design possesses positive static and dynamic stability at the design cruise flight condition.
Influence of the trailing edge shape on the aerodynamic characteristics of an airfoil at low Re number using RANS
Authors: Perrin R. , Rattanasiri P. , Lamballais E. , Yooyen S. 
Published: July 2020

Abstract
Recent studies have demonstrated that periodic spanwise modifications of the Trailing Edge of an airfoil can significantly reduce the noise produced and can also increase its aerodynamic performances. This study aims to analyse the effects of such modifications on the aerodynamic performances of a profile by numerical simulation, with a particular emphasis on low Reynolds numbers typical of Unmanned Aerial Vehicles, Micro Aerial Vehicle, and/or small wind turbines. In the range of Re numbers considered here, the flow presents laminar separation eventually followed by transition and reattachment (depending on Reynolds number, Angle of Attack and Free Stream Turbulence).
As the standard for industrial applications is still the RANS approach, thanks to its moderate computational cost, this approach is considered here and a first step consists in evaluating the ability of recently proposed transition models (Menter, 2015; Ge, 2014; Kubacki, 2016) to predict the characteristics of the flow for such geometries. A baseline NACA0012 profile is considered, together with modified Trailing Edges (blunt and serrated). Simulations are performed using Code_Saturne (2nd order finite volume), and the influence of the Free Stream Turbulence, Angle of Attack, and Reynolds number on the aerodynamics performances is examined. The results are compared with data from the literature.
Flow Simulations of Modified Diffuser Augmented Wind Turbine
Authors: Kannan Thangavelu Saravana , Goh Leong Wan Timothy , Piraiarasi C 
Published: July 2020

Abstract
In order for wind technology to compete with conventional sources of energy, in terms of energy production costs, researchers are working on different ways to increase the energy density in wind. Development of wind power augmentation system is one of the most promising concepts in this field. The main objective of this research is to propose a new diffuser design for Diffuser Augmented Wind Turbine (DAWT) by introducing air vents and vortex generators. This study also investigates the effect of wind velocity and air pressure on the proposed modified diffuser to develop a suitable diffuser for DAWT. The purpose of this modified diffuser is to create a low-pressure region in the centre of the diffuser to increase the inlet mass flow rate. Three modified designs were developed and were simulated using CFD techniques. Results showed an outstanding increment in wind speed, which is 8.56 m/s (2.14 times increment), over the 4 m/s initial wind speed in a modified diffuser (Model 3 Air vents with splitter). This modified diffuser is based on the parameters: rotor diameter (D) = 500 mm, diffuser length (L) = 1000 mm, diffuser open-angle (θ) = 12º, flange size = 221.73 mm and inner splitter with 14º open-angle (α).
Modelling Method Investigation of Drive and Motor for an Industrial Overhead Crane
Authors: Suksabai Nattapong , Waikoonvet Jatuporn , Chuckpaiwong Ittichote 
Published: July 2020

Abstract
Overhead cranes are commonly used to carry heavy objects from one place to another in a workspace. In common, 3-phase electric drive and induction motor are selected to drive a crane in three dimensions. Many mathematical models of a three- dimensional overhead crane were previously derived by energy equation to describe a relationship of applied force and crane movement. The problem was that the applied force could not be used for controlling most overhead crane systems whose motors were commonly controlled by velocity commands. Although, this problem was solved by creating an empirical model which contains the three functions: switch, rate limiter and linear second order, the further investigation and validation was still required. In this paper, the model of drives and motors of an overhead crane was investigated and validated by experiments using an industrial-grade 1-ton overhead crane. A unit step input of velocity command and actual velocity were used as data to create an empirical model. The model performance was experimentally evaluated by comparing with actual velocity and position of each time step. The discussion was also provided at the end.