bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Welding Unit Partition Method of Complex Weld Parts
Authors: Hu Yunfeng , Wu Bo , Lu Jie , Xu Jinli , Liu Xiaogang 
Published: May 2020

Abstract
Welding modularization can make the process planning and manufacturing of complex welding products easier, convenient and synergy. The appropriate units partition is critical for welding modularization. This paper proposes a method of welding units partition for complex welding parts. Firstly, the basic parts and sub parts of welding units are defined. Then, the basic parts are evaluated by using the fuzzy analytical hierarchy process (FAHP) method and the number of basic parts is determined by the improved units partition formula. Furthermore, the welding units are classified by the minimum spanning tree (MST) algorithm and the interference matrix is used to evaluate partition results. Finally, a rear sub frame of automobile is taken as an example to validate this method.
Study on Influence of Micro-tool Tip Arc Waviness on Cutting Micro Aspheric Surface
Authors: Liu Yi , Zhang Chunyu , li Guo , zhang Junjie , Zhang Haijun , song Chengwei 
Published: May 2020

Abstract
In this paper, the influence of the waviness of tip arc profile on the surface quality of micro transition arc workpiece is studied. Firstly, the contour curve of the surface of the micro tool was measured by using the radius amplitude measuring instrument, and the characteristic parameters of the waviness in the contour curve were found. A simulation study of the effect of feed rate on the quality of the machined surface of a sine wave model with different characteristics was performed by Matlab. It can be known from the simulation results that when a sine wave of 0.05sin(10t) exists in the contour of the tool tip arc, when the feed rate is small, the impact on the surface accuracy of the workpiece is greater, and a sin wave of 0.02sin(30t) locally affects the regional surface roughness is greater. With the increase of feed rate, a sin wave of 0.02sin(30t) has no effect on the surface roughness of the partial area, while a sin wave of 0.05sin(10t) still has a greater effect on the surface roughness of the partial area.
Investigation on Drill Wear and Micro Hole Quality in High Speed Drilling of High Frequency Printed Circuit Board
Authors: Liu Xianwen , Shi Hongyan , Huang Guang , Tao Sha , Gao Zhisen 
Published: May 2020

Abstract
Due to the severe wear of micro drill and the difficulty in controlling of hole quality, high speed drilling process of high frequency printed circuit board (PCB) was attracted comprehensive attention. In this investigation, the wear width of drills’ primary face was measured, and the wear morphologies of micro drills were studied at once. Furthermore, regularity of micro hole quality concerning drilling burr and nail heading while drilling with different types of drills were analyzed. The research results indicated that the wear width of diamond coating drill reduced slightly. Abrasive wear and adhesive wear were mainly occurred on uncoated drill and diamond like carbon coating drill, but some micro breaches and pits appeared on uncoated drill. Meanwhile, drilling with diamond like carbon coating drill could obtain better hole quality than drilling with uncoated ones. However, diamond coating drill performed well in terms of ability of wear resistance, as well as micro hole quality.
The effect of drying method on the surface structure of mesoporous sol-gel derived bioactive glass-ceramic
Authors: Panah Neda Ghaebi , Atkin Rob , Sercombe Tim 
Published: May 2020

Abstract
Mesoporous bioactive glass ceramic in the system of 60SiO2-36CaO-4P2O5 (mol.%) named 58S was synthesized using the sol-gel process. The effect of different drying methods (oven-drying, freeze drying, and vacuum drying) on the structure of 58S bioactive glass ceramic was investigated. Samples were characterized by scanning electron microscopy (SEM) and nitrogen sorption porosimetry (BET). SEM images of the samples after drying and then calcination indicated crystals formed in the 58S glass. The nitrogen isotherm of all samples calcinated at 600 °C revealed a mesoporous structure for 58S glass-ceramics. BET surface area of freeze-dried sample after calcination was greater than that of the oven and vacuum dried specimens. Drying methods had significant effect on morphology, surface area, and shape of pores.
Theoretical investigation on electron transfer-based antioxidant activity of melinjo resveratrol
Authors: Khoirunisa V , Fadilla R N , Boli L S P , Rusydi F , Rachmawati H , Dipojono H K 
Published: May 2020

Abstract
We employ density functional calculations to study the electron transfer-based antioxidant activity of resveratrol derivatives from melinjo. The derivatives are monomer resveratrol which is trans-resveratrol, and dimer resveratrol which are gnetin C, gnetin L, and gnemonoside C. The results show that gnetin C has the lowest adiabatic ionization potential both in gas phase and water environment. Furthermore, our results demonstrate that dimer resveratrol is consistent to have better electron transfer ability than its monomer. This may due to the destabilization of the high occupied molecular orbital energy of resveratrol. However, the presence of glucoside in gnemonoside C does not affect the electron transfer-based antioxidant activity of dimer resveratrol.
Discharge Energy Efficiency Improvement of P(VDF-HFP) Copolymers Thin Films by Stretching and Electron Beam Irradiation
Authors: Permana A A , Putson C 
Published: May 2020

Abstract
Toward improving the applications for energy-based technology, dielectric polymers is getting attention due to its relatively high dielectric constant, dielectric breakdown and flexibility, with easily preparation, lightweight and low cost. Dielectric contribution and polarization responses lead to different shape and size of hysteresis loop. This work presents the techniques on reducing domain size for slimmer loop, indicating lower energy loss. As-casted P(VDF-HFP), stretched P(VDF-HFP) and electron irradiated-stretched P(VDF-HFP) thin films were prepared by solution casting method. The irradiation was prepared by emitting electron beam. The dielectric and AC conductivity properties were investigated by LCR meter, while polarization-electric field loops were observed by P-E loop instrument. The results show that stretching and electron beam irradiation significantly increase the dielectric constant of P(VDF-HFP). Their ability on modifying the domain size leads to reduce P-E loop of P(VDF-HFP), followed by reducing energy loss but improving storage energy density and discharge energy efficiency.
Multi-electrode Designed Shape for Small Scale Plasma Incinerator
Authors: Kongphet Grich , Wongwuttanasatian Tanakorn , Suksri Amnart 
Published: May 2020

Abstract
Currently electronic waste has increased due to the growth of an industrial economy. Conventional method of waste destruction was to use burner that heats up and finally forming hydrocarbon to an atmosphere. Recently, plasma technology is an alternative method that has an efficiency and safe to use as a mean for waste destruction due to its higher temperature. This research is an improvement design of electrodes tip used for plasma head assembly using small scaled power supply. The designed shape and materials such as graphite, steel and tungsten were simulated and used to evaluate the generated plasma. In addition, electrode designed group were compared for a current density and current distribution from a simulation which will also determine for a plasma length, temperature and durability of material on actual experimental. Electrode shape was designed with sharp cornered that has cross sectional area indicated that it has highest current distribution at the tip of electrode surface. Based on the simulation results, the proposed designed electrode was capable of highest current density when compared with others. The simulated and experimental results have been shown to agreed well for plasma length and temperature.
Effect of Wedge Tip Thickness of Nail Clipper on Cutting Characteristics of Polystyrene Ribbon
Authors: Ruchirabha Thepwachara , Nagasawa Shigeru 
Published: May 2020

Abstract
This research was aiming to investigate cutting characteristics of Polystyrene ribbon that were cut by nail clippers. A pair of rotational-linked fixture of recent designed JIG was developed for measuring the cutting load and displacement of nail clipper arm. Nail clippers had the upper apex angle of αU
= 13°, αU
' = 45° and lower apex angle of αL
=20° and the lower biting edge thickness w
L was chosen 0.06 and 0.25 mm. A 2-mm-width and 1-mm-thickness polystyrene ribbon was cut using the nail-clipper and the load response and the cut trace of sheared zone were investigated under the indentation velocity at V = 0.01 mm⋅s−1. A large force dropped and unstable crack was detected when using w
L = 0.06 mm, while the force drop was disappeared without any large crack when w
L = 0.25 mm due to the frictional restriction for fastening the work piece. While the peak line force was direct variation with tip thickness. When considered to vibration during cutting process by using AE sensor, nail clipper that have lower anvil thickness at 0.25 mm have lowest amplitude. Moreover, the cut traces were detected by microscope CCD camera.
The Potential of Oil Palm Ash and Eggshell Powder as Hybrid Biofillers in Natural Rubber Biocomposites
Authors: Ming Philip Tan Shien , Bao Chai Ai , Kamaruddin Shamsul , Ying Ch’ng Shiau 
Published: May 2020

Abstract
Astronomical amounts of solid biomass wastes are generated globally each day. It is imperative that the potential of conversion and utilisation of these wastes be identified and implemented, thus reducing landfill load and recovering value from this immense source of material. Natural rubber biocomposites were produced by compounding natural rubber matrix with oil palm ash and eggshell powder as hybrid fillers. The mechanical properties of the biocomposites were determined. It is observed that the biocomposites exhibit higher stiffness than the unfilled natural rubber compound. Acid treatment is found to further increase the stiffness of the biocomposites.
Application of Natural Dolomite for Soil Upgrading
Authors: Pimolrat Jakapan , Maneeintr Kreangkrai , Meechumna Pinyo 
Published: May 2020

Abstract
Soil degradation is the conditions with low-soil quality. It can result in low fertility, in soil. To overcome this problem, soil-quality upgrading should be applied. For this study, the acidic soil from Nan, Thailand is used to upgrade the soil conditions to fit well with the agricultural activities by using natural dolomite as a waste from the industries. It is blended with the acidic soil in various ratios from 5-30 % by weight. The optimal conditions for various soil properties such as pH, electrical conductivity (EC), bulk density and soil texture are investigated. From the results, the higher amount of dolomite can improve the soil properties. Acidity is lowered from 4.832 to 6.047. Bulk density is decreased at 1.1114 g/cm3. Particle size distribution is sharply increased with the amount of dolomite. EC values are raised up to 4.25 dS/m. The natural dolomite can increase the soil quality from Nan province.
Developing a Trajectory Planning for Curved-Contoured Surfaces for Use by 8-DoF Workcell in Robotic Fibre Placement
Authors: Ammar Mohamed M.A. , Shirinzadeh Bijan , Zhao Pan , Shi Yaoyao 
Published: May 2020

Abstract
The replacement rate of conventional material by composites is increasing. Possessing high specific strength and stiffness makes composites attractive to many applications. Different techniques are being utilized for composite placement processes. Robotic Fibre Placement (RFP) is introduced as a competing approach for composite fabrication. This approach can provide many advantages; e.g. low labor cost, high performance, quick and effective process. The current work proposes an 8-DoF system established for laying the composite material. This system composed of three main units includes a 6-DoF industrial robot and two mandrel tools with different configurations. A sensory-based feedback control system is developed to manage the placement process. The placement process can be performed on two different surfaces. The end-cap surface has been fabricated then the cylindrical surface. Different geometries of pressure vessels have been generated; e.g. Oxidizer tanks that can be used in many applications such as (Hybrid rockets).
Perpendicular magnetocrystalline anisotropy energy (MAE) of 111-surface slab of Fe2CoAl
Authors: Lalrinkima  , Fomin L A , Malikov I V , Zadeng Lalthakimi , Rai D P 
Published: May 2020

Abstract
We have analyzed the surface stability of different orientations(111, 001, 011) of Fe2CoAl (FCA) slabs. Among all the slabs, the orientation with 111-surface is found to be most stable with minimum energy. The surface electronic and magnetic properties along with the atomic orbital resolved magnetocrystalline anisotropy energy (MAE) has been performed by using first principles density functional theory (DFT). We have reported the surface metallicity with dispersed electronic bands around the fermi energy (E
F
) in all the three terminals Fe/Co/Al. This may be the result of translational broken symmetry in which metallic bonds are broken with the release of free conducting electrons on the surface. We have observed the presence of both the in-plane MAE and the out-plane MAE characterized by the distribution of total MAE over an atomic sites for each Al-, Co- and Fe-terminal. The total MAE favors in-plane magnetization in case of antiferromagnetic configured Al-terminal (MAE = 0.034 meV) and Fe-terminal (0.68 meV) whereas out-plane total MAE is observed in ferromagnetic configured Co-terminal.
Physical properties of 2D MXenes: from a theoretical perspective
Authors: Champagne Aurélie , Charlier Jean-Christophe 
Published: May 2020

Abstract
The family of 2D materials has expanded quite rapidly, especially with the addition of transition metal carbides and nitrides called MXenes, in the last decade. Since their discovery in 2011, about 30 different MXenes have been synthesized, and the structure and properties of several dozens have been predicted by first-principles approaches. Given the outstanding advances in the MXene field, it is thus appropriate to review the most relevant properties of these MXenes and point out their potential applications. In this article, the structural, transport, magnetic, vibrational, mechanical, and electrochemical properties of MXenes are overviewed. The goal is to illustrate how the chemical versatility in the intrinsic composition and surface terminations combined with the potential addition of a fourth element enable to tune MXenes properties to meet the targeted applications.
Preserved layout features embedded in road network development
Authors: Cirunay M T , Soriano M N , Batac R C 
Published: May 2020

Abstract
Road networks are some of the oldest and most permanent man-made structures in space, serving as valuable records of the conditions of the society through long periods of time. Quantitatively analyzing these networks will therefore reveal rich insights into the socio-political conditions of the society through history, and can provide awareness for effectively managing the growth and evolution in the future. Here, we extracted the state of the road network of Manila, Philippines at various points in history through georeferencing and digitization of hand-drawn historical maps. Visual and metrical analyses revealed key well-planned periods punctuating the otherwise self-organized growth, particularly the more recent densification at reclamation areas coincident with the rapid economic growth. The road network of Manila shows statistical regularities that are also observed for other global road network data sets, although the recent reclamation significantly increase the statistics of the very short and peripheral nodes. Finally, the clusters of nodes with the highest closeness centralities mimic the historical shape of the network, allowing for an automatic identification of the core historical sections of the city. Studies such as this one extract useful information from these permanent spatial records, which may then be useful for developing sound policy measures for handling further urbanization.
Simplicial complexes: higher-order spectral dimension and dynamics
Authors: Torres Joaquín J , Bianconi Ginestra 
Published: May 2020

Abstract
Simplicial complexes constitute the underlying topology of interacting complex systems including among the others brain and social interaction networks. They are generalized network structures that allow to go beyond the framework of pairwise interactions and to capture the many-body interactions between two or more nodes strongly affecting dynamical processes. In fact, the simplicial complexes topology allows to assign a dynamical variable not only to the nodes of the interacting complex systems but also to links, triangles, and so on. Here we show evidence that the dynamics defined on simplices of different dimensions can be significantly different even if we compare dynamics of simplices belonging to the same simplicial complex. By investigating the spectral properties of the simplicial complex model called ‘network geometry with flavor’ (NGF) we provide evidence that the up and down higher-order Laplacians can have a finite spectral dimension whose value depends on the order of the Laplacian. Finally we discuss the implications of this result for higher-order diffusion defined on simplicial complexes showing that the n-order diffusion dynamics have a return type distribution that can depends on n as it is observed in NGFs.
Digraphs are different: why directionality matters in complex systems
Authors: Johnson Samuel 
Published: May 2020

Abstract
Many networks describing complex systems are directed: the interactions between elements are not symmetric. Recent work has shown that these networks can display properties such as trophic coherence or non-normality, which in turn affect stability, percolation and other dynamical features. I show here that these topological properties have a common origin, in that the edges of directed networks can be aligned—or not—with a global direction. And I illustrate how this can lead to rich and unexpected dynamical behaviour even in the simplest of models.
Investigation on heat transfer characteristics of nano titania added transformer oil with hotspot temperature
Authors: Swati Kumari , M Vishnu , Arul Prakash K , Sarathi R 
Published: May 2020

Abstract
The heat transfer characteristics of nanofluid produced by mixing nano titania with transformer oil, facilitated by addition of surfactants are analyzed. A 2D model is used to analyze the heat transfer and fluid flow characteristics of nano fluid for understanding the formation of hot spots in the chamber filled with nanofluid. Governing equations for conservation of mass, momentum and energy for capturing the above characteristics are described. The temperature along the vertical mid line from the hot spot are measured experimentally and compared with simulation results. Temperature distribution obtained for nanofluid and transformer oil under both steady and transient state has revealed high rate of heat dissipation in nanofluid. Streamlines have shown the presence of press board affects flow in the bulk of the cavity. Nusselt number estimated across the edges of the hot spot has shown higher convective heat transfer in nanofluid.
Derivation of field equation of f(R) gravity from Euler-Poisson equation
Authors: Abdelmohssin Faisal A Y , EL Mekki Osman M H 
Published: May 2020

Abstract
We derived the field equations of

f

(
R
)

gravity using Euler-Poisson equation, which allows the boundary term to vanish in a natural way from the principle of Calculus of variation in contrary to the original theory of H. A. Buchdahl in 1970, in which the boundary term neither treated nor elaborated.
Lightning Damage Facilitates Beetle Colonization of Tropical Trees
Authors: Parlato Brady P , Gora Evan M , Yanoviak Stephen P 
Published: May 2020

Abstract
Lightning is a common agent of disturbance in many forest ecosystems. Lightning-damaged trees are a potentially important resource for beetles, but most evidence for this association is limited to temperate pine forests. Here, we evaluated the relationship between lightning damage and beetle colonization of tropical trees. We recorded the number of beetle holes on the trunks of trees from 10 strike sites (n = 173 lightning-damaged trees) and 10 matching control sites (n = 137 control trees) in Panama. The trunks of lightning-struck trees had 370% more beetle holes than control trees. The abundance of beetle holes increased with increasing total crown dieback among both control and lightning-damaged trees, and with larger tree diameter among lightning-struck trees. Beetle holes also were more abundant in trunk sections of lightning-damaged trees located directly below a damaged section of the crown. The results of this study suggest that lightning damage facilitates beetle colonization in tropical forest trees and provide a basis for investigations of the effects of lightning-caused disturbance on beetle population dynamics and assemblage structure.
Does Experiencing an Injury Claim Impact Small Construction Company Leaders’ Participation in a Fall Protection Survey?
Authors: Hurtado David , Greenspan Leah , Vogt Michael , Mansfield Layla , Olson Ryan 
Published: May 2020

Abstract

Objectives
Workers in small and medium residential construction companies (≤50 employees) have a high risk of fall-related fatality or disability. However, little is known about effective ways to engage with this subsector for research and training. We tested whether insurance-documented fall-related claims during the past 12 months and lower familiarity with equipment motivated companies’ representatives to engage with a fall protection survey.

Methods
Oregon’s largest workers compensation insurer drew a random anonymous sample of small and medium residential construction that did (n = 197) and did not (n = 195) have a recent fall-related claim. Samples were stratified by size, trade, and region. Company representatives were emailed a 34-item questionnaire about equipment familiarity to enter a raffle to win fall-prevention equipment. We coded survey engagement binarily, indicating whether a participant completed at least half of the survey. Familiarity with 10 pieces of equipment was measured with a scale from 0 (never seen it) to 3 (use it frequently) points.

Results
The survey was initiated by 88 out of 392 representatives (22.4% response rate). Of those, 63 representatives provided the company identifier which was needed to establish claim status. Survey engagement was higher among representatives from companies with claims compared with those without (57.6 versus 42.4%, P = 0.16). Equipment familiarity was lower among company representatives with lower survey engagement (1.15 versus 1.56, P &lt; 0.05).

Conclusions
The survey had a relatively encouraging response rate for a hard-to-reach sector. The large but not statistically significant difference in survey engagement rates suggests that adverse events motivate companies to engage with fall protection research. Low equipment familiarity in the sample substantiates the need to identify effective engagement methods for fall protection practices.