bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electronic and structural properties in nanocluster Al
n

−

x
Ni
x
Authors: Blanco J , Guevara U , Lozada R , Castro O 
Published: June 2021

Abstract
In this paper, we study electronic isosurfaces and structural properties in nanoclusters Al
n

−

x
Ni
x
using Density Functional Theory, with the Local Density Approximation; the density of state, the highest occupied molecular orbital and lowest unoccupied molecular orbital were determined for different structures, obtaining different values of the energies. We have obtained evidence of a contribution of d orbitals for pure Ni nanoclusters and Al-Ni nanoclusters. In addition, an overlapping of the sp orbitals is evident. We also determined that the structure with the greatest binding energy corresponded to Al 10, with a D 2

h
symmetry, and the structure with the minimum binding energy corresponded to Ni 20, with a C 2

v
symmetry.
Thermodynamic stability of gilded copper and pigments at high relative humidity and at environmental conditions of Lima, Perú
Authors: Alviz-Meza A , Rodríguez-Reyes J C F , Chacaliaza J A 
Published: June 2021

AbstractCultural heritage materials are affected by diverse environmental agents such as humidity, temperature, and pollution. This work focuses on studying the thermodynamic stability of Peruvian heritage materials such as gilded coppers and pigments within two scenarios: one under ambient conditions and the other under accelerated conditions established by the ASTM D 2247 standard. In both cases, the HSC Chemistry 6 software was implemented. The general results obtained for gilded coppers showed that by varying the relative humidity from 75% and 14 °C to 80% and 26 °C, the corrosion products move from CuO to Cu(OH)2. In addition, to Cu2Cl(OH)3 -atacamite- in the presence of chlorin. On the other hand, for hematite (Fe3O2), vermilion (HgS), and Minium (Pb3O4) pigments, we found that at ambient conditions, with NO2and SO2, they give rise to goethite (FeO(OH)), mercury sulfate (HgSO4) and lead nitrate (Pb(NO)3), respectively. These changes also modify the natural colour of pigments, where goethite gives rise to a brownish red, mercury sulfate is colorless and lead nitrate is white. This paper is a quick theoretical way to understand how cultural heritage materials can physically degrade. Future experiment trials will contribute to set strategies towards the correct management of these heritage collections.
Analysis of the titanium ions concentration implanted in low alloy steel
Authors: Calero C A , Chacón J L , Niño E D V 
Published: June 2021

Abstract
In the surface modification processes obtained by high voltage electric discharges and cathodic arc at low pressures its of great interest to estimate the concentration of ions that are implanted on the surfaces of metallic substrates. The employment of computational tools to estimate the concentrations of implanted ions on the surface of materials as a function of the depth allows to optimize the experimental processes reducing costs and time. In the present research, a software that simulates the mobility, stopping and range of ions in matter by means of the Monte Carlo method is used, in order to obtain the ratio between the concentration and the dose of ions regarding to depth in a titanium ion implantation process on the surface of chromium molybdenum low alloy carbon steel; then, using experimental parameters, the implantation dose is calculated and an estimated profile of ion concentration is obtained as a function of the depth. The results showed that titanium ions implanted at 10 KV for 5 minutes and 10 minutes had projected ion ranges until depths of 250 Å and the highest concentration is located around 50 Å; the concentration of the implanted ions increases with the exposure time of the surface because the implantation dose is proportional to the discharge time. Furthermore, it is observed that the location of the highest concentration region and the range of the implanted ions is invariant.
Simulation of a full-scale activated sludge reactor: an approach to airflow rate optimization
Authors: Cueto D C , Alviz-Meza A , Colina J 
Published: June 2021

Abstract
Wastewater systems are high-energy consuming processes that discharge considerable amounts of pollutants into aquatic ecosystems, thus requiring appropriate optimization. Therefore, a full-scale activated sludge process was studied in this work through mathematical modeling of heterotrophic and nitrifying microorganisms. The airflow rate was introduced as the controlling parameter to accomplish the degradation of pollutants. Moreover, a sensitivity analysis was performed to determine the most sensible parameters that should be evaluated through further experiments, aiming to improve the model. The obtained results indicated that readily biological oxygen demand degradation and the oxidation of ammonia to nitrite could be achieved with an airflow rate of 35 m 3 air d -1. The sensitivity analysis showed that heterotrophic kinetic parameters and oxygen mass transfer coefficient through diffusers are the most sensitive to the system. These results also proved that the air-diffusing systems can work at 0.3% of their maximum capacity to accomplish degradation. Future studies should consider other oxygen-consuming variables.
Physical – mathematical model to determine the structural efficiency of sections shaped as ellipses and parallelograms when used in reinforced concrete columns
Authors: Márquez Peñaranda J F , Vergel Ortega M , Gallardo Pérez H J 
Published: June 2021

Abstract
Current practice of structural design of reinforced concrete columns uses mainly rectangular and circular sections. Among other reasons, this preference is linked to its ease of construction and spatial efficiency, and the historical inertia of civil works processes. Nowadays, modern design and construction techniques make possible to study the structural beahviour of sections distinctively shaped. If typical sections are extended from circular to elliptical and from rectangular to parallelogram shaped, it is possible to compute mathematical and physical parameters needed for the structural analysis. This work presents a physical–mathematical model to determine the structural efficiency in terms of relative strength and stiffness of sections shaped as ellipses and parallelograms when used in reinforced concrete columns. To solve the model, a Matlab® code for drawing the column interaction diagram of each studied section was written. Each diagram describes, in terms of mechanical physics, the relation between the uniaxial bending and the compression load that defines safety conditions as a mathematical limiting curve. The governing equation has the form P(m, g)=f(M(m, g) in which P describes the axial load strength function, M the bending moment strength function, m the material properties, and g the geometrical characteristics function. Structural efficiency has been expressed as the relative behaviour of each section with respect to comparable rectangular sections. To obtain the results of the model, a Matlab® code was written.
Estimation of greenhouse gas emissions in civil construction for a modular construction on the campus of the Federal University of Rio de Janeiro, Brazil
Authors: Ribeiro A A , Guimarães C S 
Published: June 2021

Abstract
The civil construction industry is recognized as one of the activities with the greatest environmental impact on the planet, in addition to being responsible for about 10% to 20% of emissions in the extraction of raw materials and manufacture of products for this segment. The main objective of this work was to estimate greenhouse gas emissions for the construction of an administrative building at the Federal University of Rio de Janeiro, Brazil, using the modular constructive method. The methodology used to inventory emissions was structured in the Brazilian greenhouse gas protocol program, the method most used worldwide by companies and governments for conducting greenhouse gas inventories. The research was also developed by simulating its construction by the “Conventional” method using construction materials, a source of great relevance in the literature. Based on the results of the inventory, the total greenhouse gas emission was estimated at 462.90 tCO 2e for the construction of the project, with a built area of 620.03 m 2, which resulted in the emission of 0.75 tCO 2e/m 2 of built area. Comparatively, this constructive method presented 22.12% less emissions when compared to the conventional method. This result allows, as a mitigation action, the possibility of proposing the implementation of new technologies and constructive methods that propitiate the reduction of greenhouse gas emissions.
Processing-based interactive installation art design—An example of a potentially hazardous odour identification device for the vision-impaired
Authors: Xue Dongchao 
Published: June 2021

Abstract
Nowadays, as cutting-edge technologies such as information technology and artificial intelligence continue to develop at a rapid pace, the integration of technology and art is being promoted, which has led to an unprecedented development of interactive installation art. Processing, as one of the open-source programming languages, plays an important role in the applications of the creation of dynamic visual art and interactive media art. This paper examines the application of Processing in interactive installation art, using the example of a potentially hazardous odour identification device for the vision-impaired, and explores the significance of programming techniques in interactive installation art, offering new ideas for the future direction of interactive installation art creation.
Research on Cycle Aging Characteristics of Lithium Iron Phosphate Batteries
Authors: Bai Dingsong , An Ziliang , Wang Ning , Liu Shaofeng , Yu Xintong 
Published: June 2021

Abstract
As for the BAK 18650 lithium iron phosphate battery, combining the standard GB/T31484-2015(China) and SAE J2288-1997(America), the lithium iron phosphate battery was subjected to 567 charge-discharge cycle experiments at room temperature of 25°C. The results show that the SOH of the battery is reduced to 80% after 240 cycle experiments, which meets the requirements of aging and decommissioning. Calendar aging has a side effect on the experiment. As for the aging process of the battery, it provides experimental support for improving the service life of the battery.
A numerical study of dendrite growth and microstructure transition in a non-equilibrium solidification
Authors: Ao Xiaohuia , Xia Huanxiong , Liu Jianhua , He QiYang , Lin Shengxiang 
Published: June 2021

Abstract
Controlling the thermal condition of a solidification process to obtain a desirable microstructure morphology and then prepare specific materials with excellent mechanical properties or special functions has been attracting many concerns, where the behavior of microstructure morphology transition, especially the columnar-to-equiaxed transition, is one of the most important fundamental issues. This paper introduced a kinetic model for dendrite growth with a large undercooling during a non-equilibrium solidification process using cellular automaton, in which the local thermodynamic equilibrium condition, non-equilibrium partitioned solute, curvature and interface energy anisotropy were considered. The growth rate of dendrite tip was numerically investigated by using the cellular automaton model, and the effects of temperature gradient and cooling rate on the growth rate and morphology features were found. By integrating the simulation results and analytical models, a new microstructure morphology transition criterion for the non-equilibrium solidification depending on the temperature gradient and cooling rate was proposed, in which both the planar-to-columnar and the columnar-to-equiaxed transition were presented.
A study of transducers with different monitoring surfaces for assessing the condition of cavitation activity
Authors: Yin Xiaoyu 
Published: June 2021

Abstract
Cavitation has received increasing attention worldwide due to its wide application in both medical and industry fields. The condition of cavitation activities takes a key role in its practical application, and it is passive cavitation detector (PCD) that is always used to detect real-time cavitation conditions. This paper reports the performance of a novel curved PCD that improved based on traditional PCD with a plane surface. It was found that the curved PCD had better sensitivity than the plane one and its optical operating area as well as critical performance points were also given. Based on this study, monitoring the performance of PCD can be improved for cavitation detection, especially in industrial fields that use stable cavitation technology.
Analysis of Low-Speed Diesel Engine Connecting Rod Made of AL360
Authors: Helal Wasim M. K. , Wenping Zhang , Xiaobo Li , Guixin Wang , Yanpan Su , guangku Chen 
Published: June 2021

Abstract
Connecting rod is one of the most important and critical components in an engine. The scientists should work on it in order to improve its performance. In the current study, in order to analyse the stress and deformation surrounding the connecting rod, the 3 D model is built. A connecting rod made of AL360 is investigated in this study. Stress distribution and deformation of a con-rod made of AL360 are carried out.
Calibration of Dual Industrial Robot System Based on Hand-Eye Calibration Algorithm
Authors: Jin Jingsen , Hao Weidong , Yang Daoguo , Tan Zhaoquan , Zheng Chuan 
Published: June 2021

Abstract
In order to improve the cladding efficiency and quality, the dual industrial robots are used to work together to achieve the task of repairing the industrial drill. However, the calibration accuracy of the base coordinates of the dual robot system is low, which directly affects the cladding quality. In order to solve this problem, a hand-eye calibration algorithm based on fixed calibration cone is proposed to calibrate the camera installed on the flange plate at the end of the machine arm, which improves the determination of the coordinate of the feature points of the calibration object. Based on the coordinate system of the calibration object as a link, the base coordinate relationship between the two robots with high accuracy is obtained.
Lightweight Optimization Design of a Light Electric Commercial Vehicle Frame
Authors: Zhang Jian , Ran Wei 
Published: June 2021

Abstract
Aiming at the weight problem of a light electric commercial vehicle, a lightweight optimization idea is proposed, which is based on the design of the frame structure made of TC4 titanium alloy. Taken the strength, stiffness and stability of the longitudinal beam as the boundary constraints, and the minimum mass of the frame longitudinal beam as the objective function, the mathematical model was established, and the longitudinal beam size was optimized by ant colony algorithm. The influence of different materials on the strength and stiffness of the frame was analyzed from the bending and torsion conditions. The finite element model of the frame before and after optimization was established in ANSYS, and the static conditions before and after optimization were compared and analyzed. The results show that: under the constraint conditions, the frame weight of TC4 material is reduced from 122kg before optimization to 103kg after optimization, which is 15.5% less than that before optimization, and the stress and deformation of the optimized frame meet the service conditions, which has great advantages for reducing the vehicle weight and realizing the lightweight purpose.
Lithography alignment method based on image rotation matching
Authors: Zhang Shaoyu , Zhao Lixin , He Yu 
Published: June 2021

Abstract
In this paper, we propose a lithography alignment method based on digital image processing technology for the proximity-contact lithography system. We perform image processing such as edge detection and image segmentation on the input image to obtain the edge image of the alignment mark; then we use straight line detection to obtain the angle of the image and rotate the image; finally, we use the template of the alignment mark to perform image matching to obtain the position of the alignment mark. The algorithm is tested on a proximity-contact lithography machine. The results have proved that the algorithm can use any shape of pattern for lithography alignment and therefore is highly adaptable and has a wide range of applications.
Numerical Study on Impact Resistance of Periodic Porous Structure
Authors: Mengting Bai 
Published: June 2021

Abstract
Based on the face centered cubic (FCC) and body centered cubic (BCC) structures, the effects of impact velocity on the deformation modes and stress-strain curves of periodic porous structures are studied by using the dynamic display nonlinear finite element method. The numerical simulation results show that under quasi-static loading, the overall deformation mode of face centered cubic structure presents a transverse “X” shape, while the overall uniform deformation of body centered cubic structure occurs. Under high speed loading, the two structures present layer by layer deformation. With the increase of loading speed, the stress plateau of the two structures increases, and the stress-strain curves fluctuate.
Simulation analysis of asynchronous induction type coil gun armature structure parameters
Authors: Zhang Pengxiang , Shu Tao , Shi Jianming 
Published: June 2021

Abstract
In this paper, the asynchronous induction coil gun is selected as the object of study, and its working principle is firstly briefly introduced, then the mathematical model is established by using the knowledge of electromagnetism, and then the MAXWELL component of ANSYS analysis software is used to simulate the velocity change curve of the projectile in the time domain under different conditions by combining static analysis and transient analysis, which reveals the relationship between the armature The relationship between structural parameters such as armature material, armature axial length, armature position, armature inner diameter and armature outer diameter and projectile end velocity is revealed, and the influence of several structural parameters on the acceleration performance of coil gun launcher is summarized and analyzed, and the optimized design principles of armature are summarized according to the obtained conclusions to provide theoretical references for practical applications.
Stability Improvement Methods and Application Progress of Metal-Organic Frameworks
Authors: Luo FuKang 
Published: June 2021

Abstract
Metal–organic frameworks (MOFs) are a kind of product produced with a combination of an inorganic metal center and a bridged organic ligand. Because of its porosity and high specific surface area, it has attracted much attention. However, due to the metal center and coordination bond is affected readily by other environmental factors, MOFs materials have relatively poor stability, which severely hampers its application in various fields. In this research, two ways of improving stability are summarized, one is via de novo synthesis, and the other is through post-synthetic modification to improve the stability of MOFs. Moreover, MOFs and its application fields, including gas separation and storage, catalysis, medicine, sensing, rechargeable batteries and capacitors production, are prospected.
Research on Stable Motion Control Method of Underwater Robot Based on Collaborative Filtering Technology
Authors: Peng Cheng 
Published: June 2021

Abstract
As countries in the world continue to deepen marine research and development and the need for national defense construction, unmanned underwater robots are playing an increasingly important role in scientific experiments, seabed oil and gas exploration and testing, and military affairs. The motion stability of underwater robots is the key to ensure the safe and reliable operation of underwater robots, and it is the main content of stability control research to make underwater robots return to the initial state of motion after being disturbed. Therefore, it becomes very important to study stability control methods. It’s necessary. This thesis first analyzes the motion characteristics of collaborative filtering technology in water, and establishes a dynamic model of an underwater robot system composed of main thrusters, double vertical thrusters and double-sided thrusters, and performs basic fluid flow for underwater robots.
Determination of Instability Critical Speed of Articulated Vehicle on Ramp Section Based on Response Surface Method
Authors: Xingju Cao 
Published: June 2021

Abstract
In order to improve the driving safety of vehicles on the ramp section, aiming at the lateral instability problems such as sideslip and rollover in the corner driving of semi-trailer trains, the six-axis articulated vehicle, which is the representative model of current highway freight transportation in China, is selected as the research object. The TruckSim simulation software is used to establish the vehicle dynamic model of nonlinear articulated vehicle, and the orthogonal simulation test of different loading quality and different road adhesion coefficient is designed. The vertical reaction force and lateral displacement of the wheel are taken as the evaluation indexes of vehicle sideslip and rollover, and the critical speed of instability under various road conditions is obtained. On the basis of surface function fitting, combined with the simulation experimental data, the response surface mathematical model of instability critical speed, road adhesion coefficient and loading quality is established. The comparison calculation shows that only 2.23% of the calculation error of the mathematical model reduces the error of the traditional model and improves the calculation accuracy of the model. The results show that the critical speed threshold of instability decreases with the increase of loading mass. With the increase of road adhesion coefficient, the threshold of instability critical speed increases. When the road adhesion coefficient reaches 0.6, the change of instability critical speed threshold tends to be steady. The research results can provide a reference for the evaluation of rollover and sideslip during the turning of articulated vehicle and the determination of anti-instability warning speed of articulated vehicle crossing the ramp section safely.
A novel approach to ensure the quality of 7075 aluminum alloy for green manufacturing
Authors: Yang Chun-Ming , Wei Wei , Chen Chuanying , Deng Wenting 
Published: June 2021

Abstract
With the rapid development of industrial technology, the most of the traditional industrial materials have been unable to meet the needs of current industry. Aluminum alloys is one of the most popular nonferrous metal materials used in industry. Among them, 7075 aluminum alloy is common applied in aerospace and marine plates because of its corrosion resistance and high strength. To ensure the production quality of 7075 aluminum alloy, reduce the waste of resources, and realize green manufacturing, this paper proposes a product quality inspection method by combining fuzzy Six Sigma process capability index and fuzzy axiom design for the supplier selection in aluminum alloy industry. A case study in Guangdong Province is used to demonstrate the effectiveness and feasibility of the proposed method.