bluuebunny/crossref_metadata_2025_split huggingface dataset:
Considerations from the Epicenter of the Coronavirus Emergency
Authors: Sozzi Fabiola B. , Gupta Rakesh , Canetta Ciro , Blasi Francesco 
Published: April 2020

AbstractSince February 21, 2020, Lombardy region in northern Italy has experienced an outbreak of coronavirus disease 2019 (Covid-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This region, mainly a flat land with the highest density of population and industry of the country, has become the single deadliest hotspot for the coronavirus on the planet so far. More than 10,000 people have died here, with the national total across the country poised to top 18,000. The World Health Organization (WHO) first declared the Covid-19 respiratory illness unknown before the outbreak reported in Wuhan, China, last December. On January 30, 2020, the WHO denounced the Covid-19 outbreak a global health emergency. Some scientists declared the virus began circulating in Italy at least a month prior to the first case of infection recorded in February.
Study of the puzzling abundance pattern of the neutron-capture elements in LMC star J053253.51-695915.1
Authors: Han Wan-Qiang , Zhang Lu , Yang Guo-Chao , Cui Wen-Yuan , Wen Fang , Zhang Bo 
Published: April 2020

Abstract
Object J053253.51–695915.1 (J053253) in the Large Magellanic Cloud (LMC) is reported as a young stellar object (YSO). Its chemical abundances reflect the initial composition of the gas cloud in which the star formed. However, the discovery that this star shows the enhancement of the neutron(n)-capture elements and the higher ratio of the heavier n-capture elements relative to the lighter n-capture elements is puzzling. Using an abundance decomposed method, we explore the astrophysical origins of the n-capture elements in this star. We find that the abundance characteristic of the higher ratio of the heavier n-capture elements to the lighter n-capture elements can be explained by the pollution of the r-process event and the contamination of the s-process material.
Analysis of Aluminium Basalt Particulate Composite Using Stirring Casting Method Through Taguchi Method Approach
Authors: Hendronursito Yusup , Rajagukguk Tumpal Ojahan , Safii Rizal Nur , Sofii Achmad , Isnugroho Kusno , Birawidha David Candra , Amin Muhammad , Muttaqii Muhammad Al 
Published: April 2020

Abstract
Aluminium matrix composites (AMCs) becomes a choice for automotive and aerospace industries due to its tenable mechanical properties such as high hardness and good strength to weight ratio. Reinforcement like particulate alumina, silicon carbide, graphite, fly ash, etc can easily be incorporated in the melt using cheap and widely available stirring casting method. This research investigates the optimum hardness of AMCs containing basalt powder as reinforcement by setting varying parameter. The design of experiments (DOE) approach using Taguchi method orthogonal arrays L9 (33) factors 3 runs 9, was employed to predict the hardness of material casting with variable parameters such as matrix composition, stirring time, and particle size (mesh) of basalt. ANOVA and S/N ratio for determining optimum hardness (HRb) material and P-value confirms most significant parameter that affects the hardness at optimum level parameters to improve the mechanical properties of AMCs. Analysed Taguchi design observed that particle size (mesh) of basalt has a significant contribution on hardness (72.71%) followed by concentration of basalt (18.62%) and stirring time (8.45%) with an error about 0.22%. Based from previous study and field experiment, this result is match especially from different particle size will affect most of mechanical properties of composite materials.
Modification Compression Strength of Test Machine by Using Control System on Compaction Energy
Authors: Afriani Lusmeilia , Adha Idharmahadi , Juansyah Yan , Febrina Rina 
Published: April 2020

Abstract
Soil compaction for specific construction is determined soil density tests. Several methods have been developed by previous researches and the prominent method is soil density. Several types of soil compaction method in the field, namely compaction method using vibration machine, impact, and pressure. In laboratories, soil compaction test was performed by using a hammer which uses human strength to solidify soil. An experimental investigation was conducted to explore a new modification related to compression strength test machine with energy compaction control system control system the energy of compaction. Researchers tried to design and make a soil compactor with a different mould measures from the standard Proctor method to modified method. The special of this new tool is that it can measure the compaction energy from each layer and dry density values. This research used different pressures as much as 1.67 N/mm2 - 20 N/mm2, every load conducted for sandy clay and silt samples. The values of dry density obtained from this research were between 1.59 kN/m3 - 1.68 kN/m3 and the value is higher compared with the value obtained from experiments using the Standard Proctor system. Meanwhile, the soil compaction results in the laboratory by using a new modification compression strength test machine with energy compaction control system can be an option of heavy equipment which can be used in the field.
Application of SKATER and Ward’s methods in grouping Indonesian provinces based on monthly expenditure per capita of food commodity groups
Authors: Setyawan Yudi , Bekti Rokhana Dwi , Isarlin Firman 
Published: April 2020

AbstractClustering is a fundamental data mining instrument that intends to find inherent cluster structure in data. Spatial clustering methods are usually used to assess the demographic data characterization. This study aims to classify provinces in Indonesia based on monthly expenditure per capita according to food commodity groups by using Ward’s and Spatial ‘K’luster analysis by tree edge removal (SKATER) methods and to identify a better classification between the two methods. The variables of this research constitute percentages of expenditure per capita for 14 groups of food commodities of 34 provinces in Indonesia during March 2018. The results of the first analysis (excluding outliers) revealed that SKATER method produced standard deviation rasio of 0.236, better than Ward’s method that produced standard deviation rasio of 0.370. However, from the second analysis (including outliers), the outcomes showed that the Ward’s method generated standard deviation rasio of 0.170, better than SKATER method that delivered standard deviation rasio of 0.199. Moreover, it can be concluded that the second analysis is better than the first analysis because it produced smaller standard deviation ratios based on the Ward’s and SKATER methods contrasted with the first one.
Analysis Level of Motorcycle Discipline by Using the Use of Left Flow at Jl. Sudirman Metro City, Lampung
Authors: Wisman Mira , Trimoyo  
Published: April 2020

Abstract
The high number of accidents on Jl. Sudirman Metro city in Lampung is caused by presence of mix traffic, as well as the absence of special treatment for vulnerable motorcycle users, resulting in conflict between motorbikes and other vehicles that have the potential to cause accident. This analysis was carried out to reduce the frequency of high accidents and fatalities due to accident on Jl. Sudirman, an analysis of motorbike lane requirements on Jl. Sudirman and speed management was conducted, one of which was speed limit determination. The analysis samples taken by 7 days survey from 6.00 am – 06.00 pm on Jl Sudirman Metro city Lampung. The result of the surveys showed the criteria for motorcycle lane determination criteria not suitable to implement on Jl. Sudirman segment if it is in accordance with specified indicator because the motorcycle traffic volume is less than 674 smp/hour and 2696 vehicle/hour. This paper indicates that survey analysis on motorcycle driver discipline by using of left flow at Jl. Sudirman Metro city Lampung was not significant. In order to reduce the frequency of high accident we need speed limiting guards with maximum speed 40 km/hours and the signs for motorcycle instruction using the left lane.
Anti-adjacency and Laplacian spectra of inverse graph of group of integers modulo n
Authors: Murni  , Hadi Agung Efriyo , Febry Ifkra , Abdussakir  
Published: April 2020

AbstractResearch on the spectra of a graph still attracts the attention of many researchers over the last decades. In addition, research related to graphs obtained from an algebraic structure such as groups and rings is also growing. This paper determines the spectrum of the anti-adjacency and Laplacian matrices of inverse graph of a finite commutative group, namely the addition group of integers modulon. It can be concluded that all eigenvalues of anti-adjacency and Laplacian matrices of the inverse graph of addition group of integers modulonare integer
The Application of Non-deterministic Model Updating method of a Complex Jointed Structure using Central Composite Design based meta-model
Authors: Aziz Shah M.A.S. , Yunus M.A. , Abdul Rani M.N. , Sani M.S.M. 
Published: April 2020

Abstract
Finite element (FE) model of a structure is highly depended on idealising and simplification of model, however, the model may not truly represent the physical structure. The application of FE model updating is advocated to modify FE model of structure in order to acquired better correlation between the predicted and measured structure response. Nevertheless, for complex jointed structure, a FE model is containing a very large degree of freedoms that may contribute to high computational time. Therefore, this paper presents the application of response surface method in non-deterministic model updating using central composite design (CCD) sampling for improving the efficiency of a finite element model of a laser stitch welded structure. In this study, FE model of the structure is developed using CQUAD4 shell elements and ACM2 element connectors been used to representing the laser stitch weld joints. For the measured data, experimental modal analysis was performed using LMS SCADAS and conducted under free-free boundary conditions. In the model updating, the minimisation of uncertainties parameters in the FE model is based on the objective function that is formed from the residuals between the FE and experimental natural frequencies. The results show that the response surface method using CCD sampling is efficient to be used in FE model updating because it is capable of improving the accuracy of the initial FE model.
Ergonomic Design for Tempe Production Tool Based on User Voice
Authors: Asih E W , Mawadati A , Lestari N 
Published: April 2020

Abstract
The process of tempe production in small industry are considering not optimal yet. The process does not consider the ergonomic aspects and is not environment friendly. It causing complaint at some body parts and pollution. For the solution, this research aims to design a multifunctional tool that considering ergonomic and eco-friendly aspect. The design will be based on Ergonomic and the Quality Function Deployment (QFD) methods. Based on evaluation using the Nordic Body Map, it shows that body parts with the most complaints are the waist, back, neck, right and left shoulder, wrist and leg. Complaints on these body parts are caused by wrong postural when doing work which is not ergonomic. And by using Quality Function Deployment (QFD) the tool designed by considering user expectation and desire. it was found that the user expect for the tool to be made based on worker anthropometry, moved with a semi-manual machine and the tool model is suitable for work. Overall the design shows that the Ergonomic Tempe Maker Tool is a multifunctional tool that easy, flexible, safe and comfortable to be operated which focused on anthropometric size, uses a semi-manual machine and can be arranged up or down.
Design of Ergonomic Dust Collector Room for Coating Process Using Quality Function Deployment
Authors: Emaputra Andrean , Hidayat Taufik , Mawadati Argaditia 
Published: April 2020

Abstract
A coating process is an act of giving layers on a surface, for example, painting process, water-proofing process. The coating process needs more attention from enterprises because the processes could release dangerous particles that can be inhaled by workers. The dangerous particles could make the workers suffer from coughs, sneezing, allergic rhinitis, bronchitis, asthma, silicosis, and other decreased-lung functions. Therefore, the coating process should be done in ergonomic circumstances to avoid them from the bad effects of the un-ergonomic coating process. This research aims to find the dust collector room design meeting the ergonomic requirements for the processes. This research used Quality Function Deployment (QFD) to discover the employee needs and the requirements dust collector room should have. The employee and enterprises needs were obtained using group discussion among them working in sanitary product manufacturing made from sands, marble particles, and cement in Bantul, Yogyakarta, Indonesia. The three most important needs of the room are that the dust collector room should collect dust rapidly, localize dust spreading, and give better air circulation. The needs form the three important functional requirements the room should have, i.e., split-plastic wall, concrete wall, high and wide room. Therefore, the dust collector room should be designed based on the voice of the stakeholders to get healthy-working environment.
Active demonstration of the thermal treatment of surrogate sludge and surrogate drums using the GeoMelt™ In Container Vitrification (ICV) melter installed in NNL Central Laboratory
Authors: Clarke S , Scales C , Patel N , Roe J , Banford A W 
Published: April 2020

Abstract
Under the auspices of the THERAMIN project, the GeoMelt™ in-container vitrification (ICV) melter system installed in the National Nuclear Laboratory (NNL) Central Laboratory at Sellafield, UK, has been used to demonstrate the immobilisation of two surrogate feeds. The streams selected for demonstration were a cementitious stream representative of legacy drums or failing cemented wastes packages and a wet waste stream made up of a surrogate for Magnox storage pond sludge and clinoptilolite, an ion exchange material, as a way of demonstrating co-immobilisation. The distribution of waste species throughout the vitrified block were assessed to determine the efficacy of the mixing during the thermal treatment process. Analysis of samples from the off-gas system was carried out to establish an activity balance across the process. This paper will outline the process set up, provide operational data from the melt concluding with an assessment of the applicability of the trials results to thermal treatment of these and similar waste streams.
Incineration-vitrifícation of a mixture of zeolites, diatoms and ion exchange resins using the SHIVA process
Authors: Fournier M , Rousset F 
Published: April 2020

Abstract
The Advanced Incineration-Vitrification Hybrid System (SHIVA) process is well suited to treat organic and mineral waste, with high alpha contamination management capabilities. It allows, in a single reactor, waste incineration by a plasma burner and ash vitrification in a cold wall direct glass induction melting system. The SHIVA trial demonstrates the successful processing of an inactive waste stream analogue that contains a mixture of mineral and organic ion exchange media. The waste loading attains a promising value of 38 wt.% and a glass wasteform is obtained. Further, the microstructure, chemical composition, and chemical durability of the wasteform are characterised.
Laboratory Based X-ray Absorption Spectroscopy of Iron Phosphate Glasses for Radioactive Waste Immobilisation: A Preliminary Investigation.
Authors: Mottram L M , Stennett M C , Sun S K , Hyatt N C 
Published: April 2020

Abstract
We report the application of laboratory based X-ray absorption spectroscopy to the speciation of Fe in iron phosphate glasses prepared by conventional and microwave melting. Analysis of the weak pre-edge features in Fe K-edge XANES data demonstrated glasses produced by microwave melting to have a higher fraction of reduced Fe2+ species, since microwave melts do not have sufficient time to equilibrate with the prevailing oxygen partial pressure, compared to counterparts produced by conventional melting. Furthermore, our laboratory XANES data are consistent with the formation of octahedral Fe2+ at the expense of tetrahedral Fe3+ species, with increasing Fe2+ content. These findings are consistent with the previous findings of our 57Fe Mossbauer study, synchrotron XANES data, and current understanding of the structure of iron phosphate glasses, and demonstrate the utility of laboratory based XANES for routine speciation of Fe in these and other materials.
Neutral and charged excitons interplay in non-uniformly strain-engineered WS2
Authors: Kovalchuk Sviatoslav , Harats Moshe G , López-Polín Guillermo , Kirchhof Jan N , Höflich Katja , Bolotin Kirill I 
Published: April 2020

Abstract
We investigate the response of excitons in two-dimensional semiconductors to nonuniformity of mechanical strain. In our approach to non-uniform strain-engineering, a WS2 monolayer is suspended over a triangular hole. Large (>2%), strongly non-uniform (>0.28% µm–1), and in-situ tunable strain is induced in WS2 by pressurizing it with inert gas. We observe a pronounced shift of the spectral weight from neutral to charged excitons at the center of the membrane, in addition to well-known strain-dependent bandgap modification. We show that the former phenomenon is a signature of a new effect unique for non-uniform strain: funneling of free carriers towards the region of high strain followed by neutral to charged exciton conversion. Our result establishes non-uniform strain engineering as a novel and useful experimental ‘knob’ for tuning optoelectronic properties of 2D semiconductors.
Nickel nanoparticles coated on the exfoliated graphene layer as an efficient and stable catalyst for oxygen reduction and hydrogen evolution in alkaline media
Authors: Kakaei Karim , Ostadi Zahra 
Published: April 2020

Abstract
In this work, we report simultaneous electrochemical exfoliation of graphite powder using SDS, anionic surfactant salts, and cyclic potential to prepare graphene on carbon paper. Then, Nickel is electro-reduced into graphene nanosheets on carbon paper and also on the bare carbon paper to use in alkaline media for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). Afterward, graphene and Ni-graphene are characterized using scanning electron microscopy, atomic force microscopy (AFM) and electrochemical technique. SEM images show the Cauliflower structure of Ni in the absence of graphene and nanoparticle shapeless in the presence of smooth graphene. The electrochemical results show an excellent catalytic activity of Ni-graphene/ carbon paper with an over potential of 90 mV (Versus Ag/AgCl), which is lower than the literature value for Ni in alkaline electrolyte for HER (120 mV dec−1). The effect of graphene support on the electrochemical impedance spectroscopy response, activation energy and HER activity of the samples are investigated carefully. Finally, we prepare a novel gas diffusion electrode by using Ni pasted on carbon paper for the ORR in fuel cells and compared it with standard Pt/C catalysts using linear sweep voltammetry.
Development of efficient semipolar InGaN long wavelength light-emitting diodes and blue laser diodes grown on a high quality semipolar GaN/sapphire template
Authors: Li Hongjian , Zhang Haojun , Li Panpan , Wong Matthew S , Chow Yi Chao , Pinna Sergio , Klamkin Jonathan , DeMierry Philippe , Speck James S , Nakamura Shuji , DenBaars Steven P 
Published: April 2020

Abstract
Semipolar/nonpolar GaN-based optoelectronic devices become attractive due to several advantages such as alleviation of quantum-confinement Stark effect, high polarization ratio and optical gain. High performance semipolar/nonpolar InGaN light-emitting diodes (LEDs) and laser diodes (LDs) grown on semipolar/nonpolar bulk GaN substrate have been demonstrated. Owing to the limited size of such costly substrate, hetero-epitaxial growth of semipolar/nonpolar LEDs and LDs on foreign substrate causes lots of attentions. However, it is very challenging to realize efficient semipolar/nonpolar optoelectronic devices on foreign substrate due to the high dislocation density and possibly high basal plane stacking fault density. In this article, we review two growth methods to obtain high crystal quality semipolar (11-22) and (20-21) GaN layers on specially patterned sapphire substrate. The use of these substrates leads to the realization of efficient long wavelength InGaN semipolar LEDs and the first demonstration of semipolar blue LDs grown on foreign substrate shown in our previous reports. These results demonstrate significant progress in exploring the semipolar GaN materials quality and the devices efficiency grown on foreign substrate.
Prospective Study on Clinical Efficacy and Safety of a Single Session of Microfocused Ultrasound With Visualization for Collagen Regeneration
Authors: Araco Antonino 
Published: April 2020

Abstract

Background
Recent studies have shown that transcutaneous microfocused ultrasound with visualization is beneficial for noninvasive skin tightening, collagen regeneration, and lower face contour improvement.

Objectives
The primary study endpoint was the improvement of the laxity and ptosis face skin; the secondary endpoint was the improvement of wrinkles, texture, and hemoglobin content; and the third endpoint was the patient’s responses to a patient satisfaction questionnaire.

Methods
Patients with soft to moderate skin laxity and ptosis of the face and neck were enrolled and their sex, ethnicity, age, Fitzpatrick skin type, and smoking habit recorded. Patient assessment was made by digital macro-photographs, Vectra H2, and Antera 3D, and strict exclusion criteria were set up.

Results
From November 2017 to November 2018, 47 women and 3 men with a mean age of 52.8 ± 7.43 years and Araco’s Ptosis Scale System 2.7 ± 0.46, which fit the inclusion criteria, were enrolled in the study. All patients signed a consent form and received 1200 spot-lines (400 lines from each transducer) of microfocused ultrasound with visualization. No major side effects were reported during the study and all patients completed the follow-up after 6 months. Wrinkles, texture, Surgeon Assessment Scoring System scores, and patient satisfaction questionnaire scores improved significantly. Patients found the treatment tolerable according to the patient pain scale rate. No statistically significative differences were found among homogenous groups of smokers and nonsmokers.

Conclusions
The study proves that microfocused ultrasound with visualization in a single session of treatment in monotherapy is safe and effective for the treatment of face laxity and ptosis when a proper number of energy spot-lines is delivered in the correct tissue layer.

Level of Evidence: 4