bluuebunny/crossref_metadata_2025_split huggingface dataset:
Observation of line emissions from Ni-like W46 + ions in wavelength range of 7–8 Å in the Large Helical Device
Authors: Oishi Tetsutarou , Morita Shigeru , Kato Daiji , Murakami Izumi , Sakaue Hiroyuki A , Kawamoto Yasuko , Goto Motoshi 
Published: December 2020

Abstract
Tungsten W46+ lines were successfully observed in the extreme ultraviolet (EUV) wavelength range of 7 ∼ 8 Å in the Large Helical Device (LHD). Tungsten ions are distributed in the neutral beam injection (NBI) heated LHD plasma by injecting a pellet consisting of a small piece of tungsten metal wire enclosed by a carbon tube. While the electron temperature has a sudden drop due to the pellet injection, it can be recovered by applying electron cyclotron heating (ECH) together with continuous NBI heating. It is found that a W46+ line at 7.93 Å is emitted when the central electron temperature ranges around 3.4 keV with relatively high intensity and is isolated from other intrinsic impurity lines. The 7.93 Å line consists of two lines of forbidden transitions which are blended with each other; an electric quadrupole (E2) transition at 7.928 Å and a magnetic octupole (M3) transition at 7.938 Å. Observation of W46+ lines in the stellarator experiments is reported for the first time in the present study while the lines have been already observed in several tokamak experiments. The electron temperature dependence of the emission intensity of the 7.93 Å line agreed well with that of the fractional abundance of W46+ ions calculated using the ionization and recombination rate coefficients available in the ADAS database under the assumption of the collisional ionization equilibrium. The 7.93 Å line observed in this study will be used as tools for further spectroscopic researches, such as the measurements of spatial profile of W46+ ions using a space-resolved EUV spectrometer developed in LHD.
Numerical investigation of the Adomian-based methods with w-shaped optical solitons of Chen-Lee-Liu equation
Authors: Mohammed A S H F , Bakodah H O 
Published: December 2020

Abstract
The present paper computationally examines the w-shaped solitary wave solutions for an important type of nonlinear Schrödinger equation that appeared in 1979 called the Chen-Lee-Liu (CLL) equation by proposing two recursive schemes. The schemes are based on the famous Adomian’s efficient decomposition technique. We successfully simulated the two proposed schemes with the aid of mathematical software and established a comparative analysis. It is noted from the present study that the improved method performs better than the classical method at different time levels. This is in fact in conformity with most of the results in the related literature. We finally present tables and a series of figures to support the presented results.
Entanglement created in scattering processes
Authors: Karlsson Erik B 
Published: December 2020

Abstract
Quantum entanglement is a basic ingredient in the formalism of quantum mechanics and was held by Heisenberg as its most emblematic feature. But although all its consequences could be foreseen from the start, it took half a century before experiments were carried out to test its more intriguing predictions. One reason was that sufficiently sensitive tools, like lasers, were not yet available, but there was also a lack of interest and imagination among theoreticians, who did not realize its full potential. When experiments were finally realized and opened a ‘weird and ghostlike quantum world’, they were first met with surprise and doubt. In the first experiments on entanglement it was purposely created (using chain-decays or down-conversion), but entanglement is actually a ubiquitous phenomenon appearing in most physical processes, although surviving over so short time-scales that it is usually not observed. The present work deals with ‘measurement-induced entanglement’ in scattering, and starts with a process where its effects can actually be studied in the sub-femtosecond range in a time-resolved manner, the Compton scattering of neutrons. Based on results from this method, the conditions for observing similar effects in other scattering processes are discussed. First, the mechanisms for entanglement creation by a scattering particle are mentioned, then the conditions for observing measurable consequences of it on scattering cross-sections: a very limited number of scattering centers, large zero-point motions of the scatterers and no strong interaction with environment which leads to decoherence.
Scrutinizing the heterogeneous spreading of COVID-19 outbreak in large territorial countries
Authors: da Silva Rafael M , Mendes Carlos F O , Manchein Cesar 
Published: December 2020

Abstract
After the spread of COVID-19 out of China, the evolution of the pandemic has shown remarkable similarities and differences between countries around the world. Eventually, such characteristics are also observed between different regions of the same country. Herewith, we introduce a general method that allows us to compare the evolution of the pandemic in different localities inside a large territorial country: in the case of the present study, Brazil. To evaluate our method, we study the heterogeneous spreading of the COVID-19 outbreak until May 30th, 2020, in Brazil and its 27 federative units, which has been seen as the current epicenter of the pandemic in South America. Each one of the federative units may be considered a cluster of interacting people with similar habits and distributed to a highly heterogeneous demographic density over the entire country. Our first set of results regarding the time-series analysis shows that: (i) a power-law growth of the cumulative number of infected people is observed for federative units of the five regions of Brazil; and (ii) the distance correlation calculated between the time series of the most affected federative units and the curve that describes the evolution of the pandemic in Brazil remains about 1 over most of the time, while such quantity calculated for the federative units with a low incidence of newly infected people remains about 0.95. In the second set of results, we focus on the heterogeneous distribution of the confirmed cases and deaths. By applying the epidemiological susceptible-infected-recovered-dead model we estimated the effective reproduction number (ERN)

R

e

during the pandemic evolution and found that: (i) the mean value of

R

e

for the eight most affected federative units in Brazil is about 2; (ii) the current value of

R

e

for Brazil is greater than 1, which indicates that the epidemic peak is far off; and (iii) Ceará was the only federative unit for which the current

R

e

<
1

. Based on these findings, we projected the effects of increase or decrease of the ERN and concluded that if the value of

R

e

increases 20%, not only the peak might grow at least 40% but also its occurrence might be anticipated, which hastens the collapse of the public health-care system. In all cases, keeping the ERN 20% below the current value can save thousands of people in the long term.
Research on Customer Relationship of Power Marketing Based on Clustering Model of Internet
Authors: Tian Hao Jie 
Published: December 2020

Abstract
After entering the new century, information technology and Internet technology have developed rapidly, and the application of network technology has become more and more widely used. In the power marketing relationship, the adoption of new technologies has become increasingly important for the management of customer relationship. This paper combines the concept of difference degree in data mining clustering analysis algorithm to design an evaluation tool suitable for this model. The degree of difference in cluster analysis of data mining is used to describe the similarity between two objects. When the attribute values of the description object are different, the calculation method of the difference degree is also different. In the field of clustering analysis problems, a method for calculating the degree of difference has been proposed for the problem of two-dimensional variable high-dimensional sparse clustering.
Design of wearable squat booster for automobile assembler based on ergonomics
Authors: Chen Zhewen , Qiao Zhifeng , Bao Tianxu , Dou Fuchao , Chen Xinpu 
Published: December 2020

Abstract
Aiming at the problem that automobile assembler need to squat for a long time, a wearable squatting assistance system with low cost, simple control and easy to squat and walk is designed. Based on ergonomics and finite element theory, UG was used to draw a three-dimensional solid model of the wearable squatting power system for automobile assemblers. With the help of ANSYS software, the statics analysis of key components is carried out to check their strength and stiffness. It is concluded that the wearable squatting power assist device for automotive fitters based on ergonomics has reached the design requirements in terms of function use and strength and stiffness.
Research on Regeneration Technology of Internal Combustion Engine Lubricating Oil
Authors: Yuan Zhong-Da , Li Hang , Cheng Xiu-Quan , Zhang Yong 
Published: December 2020

Abstract
This paper studies the high efficiency regeneration technology of waste lubricating oil and the development of related equipment, to provide the necessary technical support for the high efficiency regeneration of waste lubricating oil, and make the technology obtain the commercial promotion. After the completion of the project, the waste lubricating oil can be purified and recycled to meet the requirements of national standards and actual use needs. The treated recycled lubricating oil can function normally and can be used directly again.
Research on CNC Machining Technology of the Upper Shell of Electro-hydraulic Servo Valve
Authors: Guo Jingjie , Ma Shaojie , Zhang Xiangjin , Han Xianghui 
Published: December 2020

Abstract
The CNC machining technology of the upper shell of electro-hydraulic servo valve is complex, and the machining accuracy is required to be high. According to the existing cutting tools and machine tools, the CNC machining process with CNC lathe and 4-axis machining center is designed. First of all, the aluminum alloy blank is roughened and finished on the CNC lathe. After the processing is completed, the two ends of the blank are processed on the CNC lathe, and rough milling, fine milling, drilling and boring processing are carried out with the 4-axis machining center. After the 3D CAD model of the upper shell is constructed, the tool path of rough machining and finish machining is generated by MasterCAM software, and then the G code is generated by the post processor and input to the machining center for machining. The NC machining technology of the upper shell can effectively improve the machining efficiency and accuracy.
Modified gravitational search algorithm and its application to structural damage detection
Authors: Guo Huiyong , Wei Jiaheng 
Published: December 2020

Abstract
Gravitational search algorithm (GSA) is a novel intelligent optimization algorithm, which can be used in damage detection field. Considering it is difficult for the traditional GSA to avoid the problems of early precocity and low computational efficiency, a modified GSA is proposed to improve the detection efficiency and accuracy. First, Newton’s gravity law is described. Then, a gravitational search algorithm is introduced for damage detection and a modified gravitational search algorithm is proposed to enhance the search efficiency and accuracy. Finally, the objective function based on modal flexibility is proposed, and the modified gravitational search algorithm combined with the model updating technique is presented to detect the damage location and severity. A numerical example is given to verity the effectiveness of this algorithm. The calculated results show that the modified gravitational search algorithm can effectively detect the damage location and severity.
Effects of Cu element and heat treatment process on microstructures and properties of 6016 aluminum alloy
Authors: Kong Deming , Li Anmin , Yu Rao , Lu Bo , Wang Linzhong , Zuo Tianchen , Wei Shanjun 
Published: December 2020

Abstract
The 6016 aluminum alloy was artificially aged at different aging temperatures and time. The effects of Cu on microstructures, hardness, tensile properties and corrosion resistance of 6016 aluminum alloy were studied. The results show that the grains of the alloy added Cu are refined and new phase Q (AlCuMgSi) appears, and the mechanical properties of the alloy in T4p state are improved and the time to reach the strength peak is shortened. The intergranular corrosion resistance of the alloy decreases with the aging time, and turns to pitting corrosion in the later stage, and it suggests that the intergranular corrosion resistance of 6016 aluminum alloy added Cu is reduced.
Design of Fractional-Order PID for Stabilized Sight System via Internal Model Control Approach
Authors: Zhang Yaqiong , Guo Jiandu , Zhou Jing , Liu Yi 
Published: December 2020

Abstract
This paper aims at the problem of accuracy reduction of stabilized sight system caused by uncertain factors and disturbances under complex working conditions. Here, a fractional-order PID (FOPID) controller design method based on internal model control (IMC) approach is proposed for stabilized sight system. First, the IMC-PID is constructed by IMC approach, and then the fractional order is added to its differential and integral terms to obtain the FOPID. The traditional FOPID requires five parameters for tuned, while the proposed FOPID has only three tuning parameters, which can be obtained through the CRONE control technology. The optimal rational approximation algorithm (ORAA) with a high degree of fit is used to approximate the fractional-order calculus operator. Matlab simulation experiments show that the proposed controller outperforms other controllers and can obtain good robustness, disturbance rejection and tracking performance.
A New Design Of Navigation Light Using Wave Energy
Authors: Li Yuze 
Published: December 2020

Abstract
Numerous floating beacon lights are distributed along the coast and inland waterways. Beacon light is a kind of traffic light that is installed on some beacon to provide safety for ships traveling at night. Beacon lights mostly use batteries as power sources, and some use wind and mechanical energy to convert into electrical energy. Large lighthouses mostly use diesel engines. As a renewable and clean energy, wave energy provides a new solution to the continuous power supply needs of floating beacon lights. We have designed a new beacon light device using wave energy. The device uses low-frequency irregular wave energy to convert to high-frequency stable mechanical vibration required for power generation, and then uses piezoelectric power generation technology to convert mechanical energy into electrical energy and store it to power the floating navigation light.
Design of Robot System for Cleaning Glass Curtain Wall
Authors: Wang Guoqing , Meng Fanzhao , Yang Yonghai 
Published: December 2020

Abstract
The glass curtain wall has good heat preservation and moisture-proof performance and beautiful appearance. It is used as exterior wall decoration in high-rise buildings, its cleaning work is difficult and dangerous. In this paper, the design research of the glass curtain wall cleaning robot is carried out, and a rail-type glass curtain wall cleaning robot is designed, which is mainly composed of a detachable rail and a robot, and is controlled by a 51 microcomputer. The three-dimensional design of the cleaning robot was performed using NX software, and a model prototype was produced. This robot is light in weight and flexible in control. It is suitable for cleaning operations of large glass curtain walls and can reduce the risk factor and labor intensity of cleaning operations.
Research Into The Failure By A Brake Accumulator of A Civil Aircraft to Release Pressure
Authors: Jia Zhou 
Published: December 2020

Abstract
This document, based on a specific type of aircraft, analyzes the incomplete pressure release by the brake accumulator when the brake pedal performs the brake during the flight test, identifies the root cause, as well as finding the final solution. It can be viewed as a significant guide in flight testing or airline operations.
A review on the effect of microstructure on hydrogen induced cracking behaviour in pipeline and pressure vessel steels
Authors: Fan Yanqiu , Ma Changwen , Li Shaopo , Ding Wenhua , Zhang Hai 
Published: December 2020

Abstract
Recently, the demand for energy is increasingly higher, and to meet the demand, more pipeline and pressure vessels are used to transport and store energy. Steels served in such environment need to have basic mechanical property, as well as excellent hydrogen induced cracking performance. Because hydrogen induced cracking failure will not only cause huge economic losses, but also have a harmful impact on the environment, it is necessary to study the impact of hydrogen induced cracking on steel and how hydrogen induced cracking occurs and expands. In this paper, the most important factor affecting hydrogen induced cracking, microstructure, was introduced.
Vehicle Exhaust Gas Treatment And Energy Recovery And Utilization Device Based On Turbine Dynamic And Static Cascade
Authors: Wu Yihao 
Published: December 2020

Abstract
At present, the energy utilization efficiency of automobile engines is generally low. Only about 1/3 of the chemical energy released by engine fuel is effectively used. Most of the energy is lost or discharged into the atmosphere in the form of waste heat, which causes a great waste of energy. Based on the above problems, this work proposes a device for the purification of automobile exhaust gas and the efficient use of automobile residual energy. This design effectively increases the contact area of the harmful gas and the catalyst and improves the catalytic efficiency. At the same time, a thermoelectric power generation system is arranged in the electrostatic precipitator room, which converts the heat energy of automobile engine exhaust into electrical energy, and realizes energy recovery and utilization. The device of the invention realizes the recycling of the exhaust energy of the engine exhaust, effectively solves the defects existing in the traditional three-way catalyst, and reduces the pollution and harm caused by the exhaust gas.
Prediction Model and Simulation Analysis of the Speed of the Curve Based on the Cooperation of People and Vehicle
Authors: Yu Qiqi , Wang Jianfeng , Wang Yanxia 
Published: December 2020

Abstract
Curve is the accident road section, reducing the speed of vehicles in curve is an effective measure to reduce traffic accidents. How to predict the speed of vehicles in the safe curve is the basis of vehicle active control. In this paper, the vehicle dynamics model and the curve speed prediction model based on the cooperation of people and vehicles are established. Based on this model, the simulation analysis of the curve speed prediction is carried out, and the safe speed of the vehicle under different loading mass and road adhesion coefficient is obtained. (Abstract)
Corrosion Behavior of AlN-MgO Composite in High Temperature Lithium Vapor
Authors: Wen Bo , Chen Haozhi , Li Baorang 
Published: December 2020

Abstract
The corrosion behavior of lithium vapor on AlN composites with three different compositions prepared via plasma assisted sintering in lithium vapor was studied at 550°C. Depending upon the SEM&XRD observations, it is inferred that both MgO and Y2O3 have influences on the corrosion resistance of the composites. The presence of Y2O3 in the composites can adjust the distribution of precipitation phase on the sample surface while the increased content of MgO contributes to a relatively weak corrosion resistance. Among the three composites, the sample with AlN-25%wt MgO-3%wt Y2O3 has the worst corrosion ability.
Effect of the arc profile roll gap on forming results in flexible rolling process
Authors: Yang Yi-xue , Wang Tian-peng , Li Yi 
Published: December 2020

Abstract
Flexible rolling is a new-style process, it is suitable to produce the small batch and various size forming parts. In this paper, a new design scheme of roll gap was applied to form spherical surface. Two arc with different curvature radius are used as the upper and lower profile of the roll gap. Theoretically, the smooth and continuous arc can’t cause instability and wrinkling in the local area of sheet metal. Based on the process of flexible rolling, the finite element model was established, and the boundary conditions were determined. The forming process of spherical surface formed by arc profile roll gap was simulated. The results show that: By simulating forming process, the forming part is smooth without forming defects, the forming quality is better, it verifies the feasibility of the application.
Study on abnormal noise of leather of car shift mask based on FAT
Authors: Zhang Weizhong , Zhang Jun , Li Hongling 
Published: December 2020

Abstract
Shift cover problem is one of the hot issues of car interior trim. Based on the theory of fault tree analysis, a fault tree model of a family car was established, and various influencing factors were analyzed in detail. By optimizing the leather production process, the NVH performance of the whole vehicle is improved, which provides a reference basis for solving similar problems in engineering.
Study on the correlation of key indicators of P.O42.5 cement
Authors: Su Zhonghua , Fan Lichang , Liang Bo , Deng Xiaodong , Deng Xipeng 
Published: December 2020

Abstract
The development history and social contribution of cement were briefly described. The physical and chemical indexes of P.O42.5 cement were tested according to GB 175-2007 standard. The correlation of coagulation time, strength and chemical index was analyzed. The results showed that the final coagulation time was closely and positively correlated with the initial coagulation time, and the correlation coefficient was 0.9572. The 28-day compressive strength doesn’t have obvious correlation with final setting time, loss on ignition, MgO content and SO3 content.
Study on Mechanical Properties of PVA Modified Cement-based Composites Mixed with Silane Emulsion after Temperature Effect
Authors: Li Li 
Published: December 2020

Abstract
This article analyzes the basic performance of PVA modified cement-based composite materials, including mechanical properties, durability, and interface bonding issues. The purpose of this article is to clarify the mechanical properties of the modified material and lay the foundation for further optimization of the material ratio. Therefore, the main points of preparation of PVA modified cement-based composite material mixed with silane emulsion in this paper include testing raw materials, design of material mixing ratio, processing of specimen forming process, determination of slump of materials, pouring and maintenance of specimens, etc. the study. And through the study of the material’s flexural strength, load-displacement curve, material’s compressive strength, material’s toughness index, splitting tensile strength, specimen failure form and other mechanical properties analysis.