bluuebunny/crossref_metadata_2025 huggingface dataset:
Le modèle de motivation – opportunité – capacité : application à la mobilité étudiante régionale en Asie centrale
Authors: Syed Zwick Hélène
Published: July 2020

Cette étude distingue analytiquement les facteurs motivationnels, opportunistes et de capacité (MOA) afin d’étudier le processus de décision de la mobilité étudiante internationale dans sa configuration moderne. Pour cela, nous utilisons des données primaires issues d’un questionnaire en ligne soumis à d’anciens étudiants d’Asie centrale de cinq différents pays (Afghanistan, Kazakhstan, Tadjikistan, Turkménistan et Ouzbékistan) ayant tous étudié à l’académie de l’OSCE de Bichkek, au Kirghizistan. Nous y avons également associé une dizaine d’interviews semi-structurées. L’objectif de cette étude est de tester la présence d’une variation significative par nationalité du rôle de chaque facteur dans la prise de décision d’étudier à l’étranger. Nos résultats révèlent des différences par pays d’origine modeste et dont les principales sont au nombre de trois : tout d’abord, les participants tadjiks priorisent les opportunités physiques et le capital de mobilité au sein du facteur de capacité ; les participants turkmènes soulignent le rôle primordial d’une offre universitaire limitée dans le pays d’origine et de l’expérience imaginative, alors que les participants ouzbeks sont les plus intrinsèquement motivés parmi nos cinq nationalités lorsqu’il s’agit de décider d’étudier à l’étranger.
L’importance des métaux rares pour le secteur des technologies de l’information et de la communication, le cas d’Orange
Authors: Vaija Samuli , Philipot Éric
Published: July 2020

Depuis 2016, avec l’intégration de l’économie circulaire dans ses processus, Orange a lancé plusieurs projets pour améliorer ses connaissances dans le domaine des matériaux. Ainsi, la réalisation par le Groupe d’analyses de cycle de vie à visée d’identification des matériaux ayant le plus fort impact environnemental a été étendue aux équipements réseaux afin de renforcer en interne les connaissances sur ce sujet. Une mise à jour de la cartographie d’exposition du Groupe aux matériaux critiques a été lancée en 2018 pour couvrir les nouvelles technologies qui nécessitent potentiellement des matériaux spécifiques. Enfin, Orange s’est engagé dans les travaux de standardisation, dans le domaine de l’efficacité matière, qui se déroulent, par exemple, à l’ADEME ou à l’ITU-T, afin de pouvoir travailler sur la rédaction de l’état de l’art des exigences d’efficacité matière et ainsi les intégrer dans ses processus d’achat.
Le recyclage des cartes électroniques en France
Authors: Thomas Christian
Published: July 2020

Les cartes électroniques en fin de vie des équipements les contenant constituent, après récupération, une matière riche en métaux précieux et critiques. Leur recyclage est donc non seulement pertinent, mais également rentable. La mise en place de dispositifs réglementaires relatifs au traitement des DEEE et des VHU a permis d’améliorer leur collecte et leur traitement de premier niveau. La France a entrepris un important effort de R&D pour extraire et purifier les métaux contenus dans ces déchets particulièrement difficiles à traiter. Cependant, elle ne dispose pas encore d’une industrie métallurgique suffisamment forte ; de fait, l’essentiel des métaux contenus dans nos déchets partent à l’étranger, notamment en direction de l’Asie du Sud-Est. Nous dressons dans cet article un tableau de la situation actuelle, des acteurs du marché français et des projets émergents.
Common learning and cooperation in repeated games
Authors: Sugaya Takuo , Yamamoto Yuichi
Published: July 2020

We study repeated games in which players learn the unknown state of the world by observing a sequence of noisy
private signals. We find that for generic signal distributions, the folk theorem obtains using ex post equilibria. In our equilibria, players
commonly learn the state, that is, the state becomes asymptotic common knowledge.
Insourcen, outsourcen of backsourcen? Het geval van de Brusselse gewestelijke administratie
Authors: d’Estmael Jonathan de Wilde , Dermine Elise , Deschacht Nick , Dotti Nicola Francesco , Huegaerts Kelly , Janssens Barbara , Trionfetti Maria Cecilia , Vanroelen Christophe
Published: July 2020

Sinds de jaren 1980 zijn bedrijven en openbare besturen geneigd zich op hun kernactiviteiten te focussen en taken als IT, beveiliging, catering en schoonmaak uit te besteden. De jongste jaren zien we echter een omkering van deze tendens in vele organisaties, die sommige van deze activiteiten opnieuw intern gaan uitvoeren. Een proces dat we “backsourcing” noemen. Het doel van dit artikel is om te onderzoeken in welke mate activiteiten werden uitbesteed in de Brusselse gewestelijke besturen, wat de impact daarvan is op de betrokken medewerkers en organisaties en hoe de belanghebbenden staan tegenover een eventuele backsourcing van laaggekwalificeerde banen. In het kader van een multidisciplinair project van BSI voor Talent.Brussels hebben onze bevindingen aangetoond dat beslissingen over in- en outsourcing complex en multidimensionaal zijn en dat ze niet enkel gebaseerd mogen zijn op kostenoverwegingen.
Local level institutional complementarities in contemporary China
Authors: Gomes Alexandre De Podestá
Published: July 2020

This paper has the objective of bringing to light and comparing two different types of institutional arrangements existing in two different prefecture-level cities in China: Nanjing and Suzhou. Although both are considered affluent cities, and located in the same broad economic area, the Yangtze River Delta (YRD), and the same sub-provincial region, Southern Jiangsu, the cities present markedly distinct local institutional arrangements and accumulation regimes. The paper argues that the historical legacies of Nanjing and Suzhou have moulded the distinct institutional arrangements found in both cities, and that institutional path-dependences shaped the policies and strategies the cities decided to implement, eventually leading to distinct accumulation regimes. This study privileges a political economy definition of institutions (Amable, 2003; Boyer, 1988), and employs the concept of institutional complementarities (Amable, 2016; Aoki, 1994) in order to tackle the institutional arrangements of Nanjing and Suzhou. Initially, the paper introduces the debate on the nature of China’s state, arguing that the country is better characterized by its internal institutional heterogeneities, and that these heterogeneities often reveal themselves at subnational levels. Then the paper proceeds by presenting the analytical framework employed in this research and, after introducing the definitions of institutions and institutional complementarities, a comparison between Nanjing and Suzhou is presented. The final sections summarize the institutional characteristics and accumulation regimes found in both cities and conclude with the analysis.
Invention, centralité et fin du travail
Authors: † Michel Freyssenet
Published: July 2020

Alors qu’il nous semble inhérent à la condition humaine, le travail apparaît non seulement comme un mot et une notion historiquement datés, mais aussi comme une réalité inventée, construite par le xviiie siècle européen. Il correspondrait à l’émergence du rapport capital-travail et du travailleur libre vendant sa capacité de travail. La diffusion et l’hégémonie progressive de ce rapport social, qui se traduisent par le fait qu’il est devenu la référence pour percevoir, penser, organiser toute autre activité, auraient eu pour conséquence une extension de l’appellation “travail” à des activités qui ne relèvent pas du rapport salarié, comme “travail domestique”, “travail des indépendants”… Il en serait résulté une naturalisation du travail, dès lors perçu comme une réalité universelle et existant depuis toujours. Comme pour “l’économie”, on aurait projeté sur le passé et sur d’autres sociétés cette réalité contemporaine et à l’origine géographiquement circonscrite qu’est le travail, au lieu d’en rendre compte par les conditions historiques et non nécessaires qui l’ont fait émerger il y a trois siècles. Il n’aurait pas non plus été d’emblée central socialement, comme il l’est devenu aujourd’hui en étant la condition d’accès aux ressources nécessaires à la vie dans nos sociétés. Si son historicité implique logiquement sa disparition un jour, celle-ci ne peut raisonnablement être pronostiquée dans un avenir immédiat, car elle suppose la marginalisation du rapport social qui l’a fait naître par un autre rapport social devenu à son tour hégémonique.NdE : Le résumé en français a été rédigé par Michel Freyssenet pour sa présentation sur son site personnel (http://freyssenet.com/?q=node/357). Il ne correspond pas tout à fait au résumé en anglais qui, seul, figure dans l’article publié dans Current Sociology.
Collision-space-time: Unified quantum gravity
Authors: Haug Espen Gaarder
Published: July 2020

For about hundred years, modern physics has not been able to build a bridge between quantum mechanics (QM) and gravity. However, a solution may be found here. We present our quantum gravity theory, which is rooted in indivisible particles where matter and gravity are related to collisions
and can be described by collision-space-time. In this paper, we also show that we can formulate a quantum wave equation rooted in collision-space-time, which is equivalent to mass and energy. The beauty of our theory is that most of the main equations that currently exist in physics are, in
general, not changed in terms of predictions and what we could call structural form, except at the Planck scale. The Planck scale is directly linked to gravity, which has obviously already been detected, and gravity is actually a Lorentz symmetry as well as a form of Heisenberg uncertainty
break down at the Planck scale. Our theory gives a dramatic simplification of many physics formulas without altering the output predictions, except at the Planck scale, and this new formulation gives us a unified theory. The relativistic wave equation, the relativistic energy momentum relation,
and Minkowski space can all be represented by simpler equations when we understand mass at a deeper level. This is not attained at a cost, but rather a reflection of the benefit in having gravity and QM unified under the same theory.
Reference systems and their origins
Authors: Oldani Richard
Published: July 2020

It is demonstrated how the choice of a reference system origin influences our interpretation of the natural laws. Instead of placing it arbitrarily as is customary in mechanics, we locate it at an energy minimum, or zero point of material systems. In an example from celestial mechanics,
the sun defines the point of minimum gravitational potential and preferred origin for the planetary system. As a comparison, Heisenberg's derivation of quantum kinematics is shown to be deficient, because microscopes do not define the point of minimum energy of an atomic system. To improve
upon it, new interpretations of quantum kinematics and mechanics are proposed by locating the reference system origin at the zero point of an atomic system, where the Hamiltonian, H = T + V, equals zero. Experiments with atomic clocks are cited
in support of the new physical model. The Schwarzschild solution relative to a mass point is proposed as the preferred interpretation of a general relativity theory due to the location of the origin at a zero point. These interpretations of long-standing theories provide new points of view
to familiar problems.
Punch Tool Speed and Material Effect on Keychain Cranioplasty Plate Dimensions Using Finite Element Method
Authors: Lubis Didin Zakariya , Aminnudin Aminnudin , Perwira Andi Hajisah
Published: July 2020

This article explained the tolerance analysis method in the micro-manufacture area on the keychain cranioplasty plate product dimensions. This research aimed to compare the simulations of keychain cranioplasty plate product dimensions using the ISO 286 tolerance standard. The manufacturing process to produce the keychain cranioplasty plate used the blanking process. The dimensions analysis aimed to observe the effect of punching speed and tool punch material on the product’s quality. The ISO 286 tolerance on blanking product used IT Grade of 10 for the punching process. The keychain cranioplasty plate dimensions from the blanking process simulation had an excellent quality if the sizes were close to the actual product’s dimensions. The keychain cranioplasty plate product had to have a high precision level between 10–100 μm so that the medical field could use it.
Correlation of Extract Composition on Antioxidant Activity of Electrospun PolyvinylPyrrolidone/Bassela rubra linn Leaf Extract Composite
Authors: Septiani Eka Lutfi , Gabriel Azmi Alvian , Prastuti Okky Putri , Indahsari Defi Nur , Ariyanti Ervina Diah , Machmudah Siti , Winardi Sugeng , wahyudiono wahyudiono , Kanda Hideki , Goto Motonobu
Published: July 2020

Nanofiber through electrospinning process has been developed as a promising material for wound dressing due to its large porosity and high surface area. This characteristic of nanofiber provides an adequate gas permeability surrounding the wound which prevents the healing failure. The best wound dressing not only maintain a wound to have a good gas permeability but also to have an active agent giving an antibacterial and antiinflammation property. This research aims to combine a synthetic polymer and active agent, polyvinylpyrrolidone (PVP) and Bassela rubra linn leaf extract (BRLE), become nanofibrous material. The electrospinning process was conducted in two steps. The first step is to obtain the best voltage of PVP electrospinning by using the voltage of 10, 12, 15, 17 kV. The other step is combining PVP to 2%, 5%, 8% of BRLE. The first step shows the best operation condition is using 12 kV. Hence, it is used to obtain nanofiber with different BRLE percentage. Based on 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, the result indicates that increase the BRLE composition will rise the antioxidant activity because of the smaller diameter size.
Pyrolytic Characteristics and Kinetic Parameters Evaluation of Cassava Stalks Using Thermogravimetric Analyzer
Authors: Sukarni Sukarni , Ramadhan M. Rifqi
Published: July 2020

Pyrolytic characteristics and kinetics of cassava stalks as a renewable energy source were delved via a thermogravimetric (TG) analyzer. About 10 mg powder of the sample was heated up in the TG cavity under inert conditions with 50 ml.min-1 nitrogen flow rate and operated at 20 °C min-1 of heating program. The pyrolysis process of cassava stalks was taken place into three main stages, in which the peak reaction occurred at the second stage with 70% of the mass was degraded. The differential method of Arrhenius kinetic evaluation resulted in the values of reaction order (n) that was 0.99, activation energy that was 89.46 kJ/mol and logarithmic frequency factor (log A) was 7.7 min-1.
Synthesis and Characterization of Complex from K4[Co(SCN)6], Zinc(II) Chloride and Quinoline as Electrode Material of K-Ion Battery
Authors: Rifaldi Ade , Fariati Fariati , Wijaya Husni Wahyu , Jayanti Wiwin Dwi , Golhen Stephane , Dasna I Wayan
Published: July 2020

Prussian Blue Like (PBL) compounds that are potentially used as K-Ion Battery (KIB) electrodes have been synthesized from zinc(II) chloride and quinoline (Qn) precursors combining melting and direct reaction method. The formed K2[Zn(Qn)2][Co(SCN)6] compounds melt in range 179-181°C with conductivity value reaches 468 μS/cm. Thiocyanate and quinoline ligands were characterized using FT-IR and UV-Vis spectrometry. The cyclic voltammetry of the formed compounds showed the reduction potential up to -0.34 V (versus AgCl/Ag).
Phase Identification and Mechanical Properties on Post Weld Heat Treatment of Steel St.70
Authors: Angkasa Sendy , Prastya Whina Septi Berlianzana , Puspitasari Poppy , Aminnudin Aminnudin
Published: July 2020

In this era, technological advances in the field of construction and industry cannot be separated from welding, while the welding of medium carbon steel is a material that is widely applied using electric arc shielded electrodes and to obtain good results a post weld heat treatment (PWHT) process can be carried out. One of the heat treatments that can be applied to the post weld heat treatment is stress relief annealing. So in this paper a test was conducted to determine the value of ST70 hardness and steel phase from welding with stress relief temperature variations of annealing 600°C, 650°C, and 700°C in the weld metal area and heat affected zone. To find out the results of testing of the post weld heat treatment process with annealing stress relief method at temperatures of 600°C, 650°C, and 700°C in the weld metal area and heat affected zone, the tests used were microstructure, micro vickers hardness and X-Ray Diffraction. The results of the hardness test show that without the post weld heat treatment process the hardness in the heat affected zone is 311.8 HV and in the weld metal area is 329 HV. Whereas from the results of the diffraction phase analysis in the heat affected zone the development of grain size rises regularly along with the increase in temperature in the stress relief annealing process.
Corrosion Resistance Analysis of ST37 Carbon Steel Material Using Phosphate Conversion Coating in Various Immersion Durations
Authors: Puspitasari Poppy , Alifian Chrisye , Aripriharta Aripriharta , Razak Jeefferie Abd. , Pratama M.Mirza Abdillah
Published: July 2020

Conversion coating in metal material was a method to control the corrosion. It applied in parts of car, aircraft, factory installation, and other appliances. There were three types of conversion coating: phosphate conversion coating, chromate conversion coating, and oxalate conversion coating. There were several aspects to consider in controlling the corrosion fully. This research used phosphate because phosphate conversion coating had a low corrosion rate, affordable production cost, and environmentally friendly. This research aimed to find out the corrosion resistance of ST37 carbon steel using phosphate conversion coating in various immersion durations. Therefore, the result was a breakthrough in using phosphate conversion coating for the industries. This research used the weight loss method to calculate the corrosion rate and macro photos to obtain the corrosion form during the test. This research used ST37 carbon steel with 100 mm x 30 mm x 10 mm as the specimen and phosphate with various coating durations (10, 20, and 30 minutes). Each variation had three specimens, so this research had nine specimens in total. This research calculated the daily corrosion rate for seven days using 5% NaCl as the corrosion solution. The average corrosion rate in specimens with 10 minutes duration was 1.9599 mpy, specimens with 20 minutes immersion was 1.7647 mpy, whereas specimens with 30 minutes duration were 1.3287 mpy. Thus, the longer immersion duration created a smaller corrosion rate. Also, the corrosion formed during the test was pitting and uniform corrosion.
Measuring the Influence of Process Parameter on CuCr Electrode Tool Wear Rate for Biocompatible Zr-Based BMG Cutting Using Sinking-EDM
Authors: Pradana Yanuar Rohmat Aji , Fanani Firhan Ahmad , Aminnudin Aminnudin , Wahono Wahono , Jang Jason Shian-Ching
Published: July 2020

Subsequent processing through machining for biocompatible Zr-based BMG previously developed is needed in order to enlarge the material application, especially for medical devices. In this study the performance of CuCr tool on EDM process was investigated to cut biocompatible Zr-based BMG having low machinability nature. The experiment utilized volume loss technique to measure the TWR and consecutive SEM observation to reveal the tool wear mechanism of selected tool samples. The tool wear behavior was strongly characterized by the combination of discharge current and pulse-on time, where the larger TWR obtained by higher current and shorter pulse-on time. By SEM analysis, the irregular-shaped surface morphology with the presence of debris was observed on the tool wear region resulted by high discharge energy process. Additionally, the larger crater size, microvoids and numerous debris particles were also appeared on BMG workpiece surface machined using higher discharge energy.
Effect of Polyaniline on Structural and Optical Characteristics of Fe3O4 and TiO2 Nanoparticles
Authors: Taufiq Ahmad , Nuroni M.Sofiyudin , Hidayat Nurul , Subadra ST.Ulfawanti Intan , Sunaryono Sunaryono , Hidayat Arif , Yudyanto Yudyanto
Published: July 2020

In this work, Fe3O4 nanoparticles (NPs) were synthesized using coprecipitation method and TiO2 NPs were synthesized using sonication method. Fe3O4/polyaniline and TiO2/polyaniline nanocomposites (NCs) were synthesized using polymerization methods. The samples were characterized by X-ray diffractometer, Fourier-transform infrared spectroscopy, and ultraviolet-visible spectroscopy. The results of X-ray diffraction data analysis presented that polyaniline decreased the crystallinity of Fe3O4 and TiO2 NPs. However, the crystal structure of Fe3O4 and TiO2 NPs did not change, which successively formed the cubic spinel and the tetragonal anatase phases. Furthermore, the functional groups of Ti-O-Ti and Fe-O were detected in the wavenumber ranges of 620-580 cm-1 and 410-520 cm-1, respectively. The presence of polyaniline was also detected by the emergence of a functional group of polyaniline which also showed that there was an interaction of Fe3O4 and TiO2 NPs with polyaniline. Meanwhile, the results of UV-Vis data analysis showed that the addition of polyaniline decreased the bandgap energy of Fe3O4 and TiO2 NPs significantly from 2.186 to 2.174 eV and from 3.374 to 3.320 eV, respectively.
Effect of Nano-Al2O3 on Characteristics of Aluminium A356 Matrix Composite Produced by Stir Casting Route
Authors: Islam Nabila Akmalita Khairul , Wicaksana Nayona Ega , Zulfia Syahrial Anne
Published: July 2020

Aluminium Matrix Composites (AMCs) made by A356 as matrix and nanoAl2O3 as reinforced are widely used for high performance application because of light weight and alumina has good performance at high temperature. In this study, the nanoAl2O3 used varied from 0.1 vf-% to 1.2 vf-%, which subsequently determined the optimum point. In addition, the magnesium with 10% are added as a wetting agent between aluminium and nanoAl2O3 as reinforced. Stir casting process is carried out for 2 minutes and 4 minutes for the degassing process using argon gasses then pouring molten metal in to the mold at 800°C. The effect of nanoAl2O3 on the mechanical properties and microstructure of the composites was investigated. The result showed that the tensile strength decreased with the addition of nanoAl2O3 but the hardness increased. Increasing of hardness mainly caused by grain refinement, and particle strengthening which act as obstacles to the motion of dislocations. Addition of nanoAl2O3 as reinforced also tend to form microporosity and agglomeration which would decrease the tensile strength of composites. The optimum strength was reached by 0.5 %Vf nanoAl2O3 with the value of 140 MPa and hardness of 46 BHN which was supported by low porosity level. Keyword : Al A356, Al2O3, nanoComposite, Stir Casting
Effect of Cobalt Content on the Structural Properties of Zirconia Prepared by Sol-Gel Method
Authors: Ciptasari Nurhayati Indah , Nora Adri , Nuraini Lutviasari , Lusiana Lusiana , Darsono Nono , Amal Muhamad I.
Published: July 2020

Zirconia (ZrO2) powders doped with cobalt were prepared by sol-gel method using inorganic salt of zirconium (IV) chloride (ZrCl4) as precursor. The amount of cobalt was varied in the range of 4–16% weight percent to study the effect to structural properties. X-ray diffraction (XRD) analysis suggested the resulting phases were zirconium oxide (Baddeleyite) with monoclinic crystal system along with cobalt oxide as secondary phase. The increasing cobalt content caused the XRD peaks to shift into lower angle due to substitution of Zr atom to smaller Co atom in crystal lattice. Scanning electron microscope (SEM) images showed the samples with higher Co content had smoother surface. Generally, the microstructures of Co doped zirconia powders consisted of large agglomerates with small particles on the surface.
Preliminary Study on Gallium-Based Particle Synthesis by Ultrasonication for Microfluid Application
Authors: Ulum Reza Miftahul , Putra Wahyuaji Narottama , Hidayat M. Arif
Published: July 2020

Gallium-based liquid metals have been used widely in many industries because of their unique properties such as high electrical conductivity, the superconductive character at low temperature, and high thermal conductivity. For heat management application, Gallium based metal can be used directly in the liquid form, or in solid particle form. The solid form, however, has extensive application because it can be used as a microparticle additive to create a microfluid. In this research, the ultrasonic oscillator was used to synthesize sub-micron Gallium based particles. Ethanol and Polyethylene Glycol was used and compared as a medium during ultrasonication. Up to 15 %wt of the solid particle was successfully synthesized from one gram of liquid metal source using this simple method.
Activated Natural Zeolite Membrane for Separating Dissolved Impurities in Coconut Sap
Authors: Aripin H. , Busaeri Nundang , Gufroni Acep Irham , Sabchevski Sliven
Published: July 2020

A ceramic membrane has been produced from a natural zeolite. A series of samples has been sintered at range temperature from room temperaure to 900°C. The influence of the sintering temperature on the specific surface area, pore diameter, and surface roughness has been investigated. It has been found that a decrease for value of the specific surface area and average pore diameter from 300°C to 900°C was attributed to a change of the crystalline structure of tridimite from partially to fully crystallized samples. The fabricated membrane has been used successfully to evaluate the separation performance during the treatment of coconut sap. The membranes have a steady state flux from 0.12 to 0.22 mL/min.cm2 at an applied pressure of 1 bar.
Numerical Simulation of Carbon Dioxide Absorption by Monoethanolamine Solution with Super Mini Ring Contactor
Authors: Yuswan Muharam , Hamzah Hamzah , Audry Ramadhany Muhammad
Published: July 2020

Carbon capture storage provides an alternative to reducing global warming. In order to reduce the cost of carbon capture storage, high mass transfer packings for CO2 absorption from flue gas is an alternative. The study modeled and numerically simulated CO2 absorption by monoethanolamine solution with super mini ring contactor. The model considered the effect of the mass and momentum transfers, as well the chemical reaction. The simulation results show that the driving force of the reactive absorption is higher than the ordinary absorption in term of the low concentration of CO2 in the liquid phase. The CO2 concentration in the bulk gas is approximately 7.56 mol/m3. It decreases to around 5.75 mol/m3 after crossing the concentration boundary layer.
Mechanical Properties and Microstructure of Pulsatile Current Gas Tungsten Arc Welding (PC-GTAW) of AISI 304L Butt Joint Weld
Authors: Widyianto Agus , Baskoro Ario Sunar , Kiswanto Gandjar
Published: July 2020

In this research, investigation of mechanical properties and microstructure on Pulsatile Current Gas Tungsten Arc Welding (PC-GTAW) was carried out. AISI 304L was chosen as a base material with autogenous welding and butt joint configuration. The dimension of the base material was 120 x 50 mm and the thickness of 3 mm. The welding with pulsatile current and constant current were used in the welding process in this study. In the pulsatile current, the mean current was made all the same with a constant current of 100 amperes. The peak current, base current and time of peak and base current were varied to make it the same. The welding speed used is constant at 2.0 mm/s. The result shows that the HAZ area will get shrinkage if welded using pulsatile current welding. The welding with a pulsatile current can produce more fine cellular dendritic structure than the welding with a constant current. The UTS in the welding with a pulsatile current was lower than the welding with constant current, while the impact toughness in the welding with a pulsatile current was higher than the welding with a constant current. The highest of the UTS and the impact toughness of 577.62 MPa on parameter 65-A and 27 J on parameter 65-C, respectively.
Optimization of Gas Metal Arc Welding (GMAW) Parameters for Minimum Distortion of T Welded Joints of A36 Mild Steel by Taguchi Method
Authors: Baskoro Ario Sunar , Hidayat Rafdi , Widyianto Agus , Amat Muhammad Azwar , Putra Danurengga Ubaszti
Published: July 2020

In this study, the GMAW parameters for welding of A36 mild steel have been investigated to get the minimum of distortion. The type of welded joint used was square groove T-joint fillet weld with filler wire ER70S-6. The welding current and the welding speed were selected as input parameters while the response used was distortion (longitudinal bending distortion and angular distortion). Taguchi method was used to determine optimal welding parameters which the minimum distortion. Design of experiment was set two factors with three level in each factor and three replication, so the L9 Taguchi’s orthogonal array was applied. The minimum conditions were determined using S/N ratio with a quality character of smaller is better (SB). In addition, to determine the significance of the welding parameters used ANOVA. The results show that the welding current of 170 A and the welding speed of 4.0 mm/s were obtained as the minimum of longitudinal bending distortion and angular distortion. Based on analysis of variance, the welding current was a parameter that greatly affects the longitudinal bending distortion with the percentage contribution of 64.36% while angular distortion was strongly influenced by welding speed parameter with the percentage contribution of 53.38%.
Effect of Coal Blended on the Physical Properties of Iron Ore Briquette for Direct Reduction Iron
Authors: Khairil Khairil , Bahri Samsul , Ali Nurdin , Sofyan Sarwo Edhy , Jalaluddin Jalaluddin
Published: July 2020

Iron production by using the direct method has been promoted in order to produce iron effectively, low cost, and environmentally safe. The method was optimal requirements with respect to the feed materials especially iron ore, coal as well as a binder. In this study, the experiments were conducted on physical properties of iron ore briquette from Aceh (Indonesia) to analyze its suitability to meet the feed requirements for iron production. The term iron ore briquette refers to the materials compressed under high pressure formed by variable mixtures of iron ore, coal and binders. In the experiments, the physical properties such as the tumbler index (TI), abrasion index (AI) and shatter indices of the iron ore briquette were carried out. The experimental results show that the iron ore briquette blended with coal and using asphalt as a binder has a high tumbler index (TI) or not easily breakable compared to the iron ore briquette using dammar powder as a binder. On the other hand, the blended coal in iron ore briquette with dammar powder as the binder significantly increases the shelter index or easily breakage.
Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review
Authors: Baek Eung Ryul , Suprobo Ghozali
Published: July 2020

Microstructural design is generally applied to improve the mechanical property of titanium alloy by introducing different phase transformations and thermomechanical treatments. Aside from the martensitic and diffusion transformation, the occurrence of massive transformation occurs in Ti alloy. Massive transformation is categorized as civilian phase transformation, which resulted in the change of crystal structure of an alloy with a given composition without changing the chemical composition of its initial phase. It happened when the body centered-cubic β phase changed into hexagonal closed-pack α phase without decomposing into α+β. Massive transformation involves a diffusion and growth mechanism in a short-range and generally occurs during the introduction of high cooling rates to restrict the full diffusion mechanism. Owing to the nature of a rapid cooling rate as a requirement for massive transformation, the massive phase is normally found together with the product of martensitic transformation. On the other hand, the product of massive transformation is observed as a blocky grain with a featureless characteristic using optical microscopy and. Phase identification using electron backscattered diffraction shows that the region of αm shows only the presence of the α phase. It was reported for containing a high dislocation density similar to martensitic transformation. Specifically, in Ti alloy, the higher magnification using scanning electron microscopy shows fine sub-lamellar morphology, which observed as a combination product morphology between martensitic and diffusion transformation. It resulted in the mechanical property of the massive phase is between those two morphologies. Hence, it brings a new perspective on designing the microstructure of Ti alloy, which can be used to improve the mechanical property of Ti alloy.
The Effect of KOH Activator Concentration upon the Characteristics of Biomass-Derived Water Hyacinth Process on Lithium-Ion Capacitor
Authors: Luthfi Muhammad , Paduraksa Jagad , Verdianto Ariono , Pambudi Yoyok Dwi Setyo , Priyono Bambang , Zulfia Syahrial Anne , Lee Joong Kee , Hudaya Chairul
Published: July 2020

Lithium-ion capacitors (LIC) is believed to be an ideal option in certain application as energy storage device due to its properties either possessing high energy density (four times higher than electrical double-layer capacitor) or having as much power density as a supercapacitor. In this study, a biomass-based activated carbon (WHAC) was prepared by using the water hyacinth plant through the activation process utilizing a chemical activating agent, KOH. The water hyacinth was carbonized at 500 °C for a 1 h holding time with a ramping temperature of 10 °C/min. Then, the LICs electrode is constructed by two different types of electrode, WHAC as the main active material of cathode and lithium titanate oxide (LTO) for the anode. The biomass-derived activated carbon exhibits a high specific surface area of 791.8 m2/g and a high pore volume of 1.13 m3/g. The assembled LiCs shows a reasonable electrochemical performance with a maximum specific capacitance of 1.12 F/g with the highest specific energy of 4.48 Wh/kg and specific power of 34.14 W/kg. This LIC cell is one of the promising candidates for future applications due to its low-cost materials and owns more advantages than typical Lithium-ion Batteries (LIBs).
Electrophoretic Deposition Performance of Hydroxyapatite Coating on Titanium Alloys for Orthopedic Implant Application
Authors: Nuswantoro Nuzul Ficky , Juliadmi Dian , Fajri Hidayatul , Manjas Menkher , Suharti Netti , Tjong Djong Hon , Affi Jon , Gunawarman Gunawarman
Published: July 2020

Hydroxyapatite (HA) is potentially used as a coating material for titanium alloys to improve their bioactivity and then enhancing the osseointegration characteristic of metal implants for orthopedic application. Electrophoretic Deposition (EPD), one of the coating methods that is widely applied for coating metal because of its simplicity and relatively low cost, is chosen for coating metal implants. HA coating layer quality can be controlled by adjusting applied voltages and coating time of the EPD process. However, the optimum voltage and exposing time has not yet been known for new type titanium implant such as Ti-12Cr and TNTZ. This work is, therefore, focusing on the effect of applied voltage and coating time on the mass growth, HA coating thickness, and surface coverage that can be produced on the surfaces of both alloys, and also on the conventional titanium alloy, Ti6Al4V, for comparison. The result of this work showed that there is a significant influence of the titanium alloy type on the HA layer performances. However, it is necessary to choose a suitable voltage and to expose time for producing a sufficient coating layer that meets the standard of orthopedic implants.
Psychometric Properties of Sleep Hygiene Index in Indonesian Adolescents
Authors: Setyowati Anggi , Chung Min-Huey , Yusuf Ah. , Haksama Setya
Published: July 2020

Background

Sleep is associated with some behavioral factors such as maladaptive, which tend to disrupt its normal mechanism, therefore, a tool is needed to measure maladaptive sleep hygiene. This study aims to assess the psychometric properties of sleep hygiene index (SHI), translation, factor structure, validity, and reliability.

Design and methods

Data were collected from 101 Indonesia adolescents in junior high school, with SHI-Indonesia translated based on WHO guideline. The obtained data were analyzed using varimax rotation, while the convergent validity was evaluated by calculating the correlation between the item and total score. In addition, the Cronbach's alpha was computed to investigate internal consistency, and two-week interval test-retest was conducted to assess reliability.

Results

SHI is a unidimensional factor structure with an excellent test-retest reliability of P<0.001 at 0.618, and a positive convergent validity correlation between each item and the total score.

Conclusions

The SHI Bahasa translation is a reliable and valid tool to assess maladaptive sleep hygiene among Indonesia Adolescents.
Factors Influencing Patient Attention toward Audiovisual-Health Education Media in the Waiting Room of a Public Health Center
Authors: Tamsuri Anas , Widati Sri
Published: July 2020

Background

The Public Health Center (Puskesmas) is a primary care center in Indonesia that focuses on promotive and preventive efforts, as opposed to exclusively curative approaches. However, a major challenge has been identified in relation to the limited number of health personnel available to provide education to patients. The objective of this study, therefore, was to determine the impact of personal factors, severity of health problems, environmental situation, and patient activities on the level of attention payed to the audiovisual media.

Design and methods

The study involved the screening of 12 kinds of health education video, which ran in the LCD panel in the waiting room. The population consisted of visitors/patients that were 15 years old or older, and a sample size of 124 was selected randomly during the study period.

Results

Based on the statistical analysis, it was established that age, severity of health problems, environment situation, and visitor activity influence patient awareness to audiovisual media in the waiting room of the Public health center.

Conclusions

It is recommended that public health centers improve their environment to encourage the patients to pay attention to health media.
The Impact of Social Capital, Demographic Factors, and Coping Strategies on Community Adaptation in Supporting People with Severe Mental Illness
Authors: Lestari Retno , Yusuf Ah , Hargono Rachmat , Ahsan Ahsan , Budi Setyawan Febri Endra , Damayanti Nyoman Anita
Published: July 2020

Background

People with severe mental illness have the ability to live a satisfactory and independent life with the help of the community. Their adaptation to life's challenges is a dynamic process, and the community plays an important role. This research, therefore, aims to address the question of how social capital, demographic factors, and coping strategies affect the community's ability to adapt to people with severe mental illness.

Design and methods

The multi-stage random sampling was used to obtain data from 137 respondents from rural society using an analytic observational design and cross-sectional approach. In addition, the Somers’ D test was used to measure the effect of social capital, demographic factors, and coping strategies on community adaptation.

Results

The results showed a significant effect of social capital, demographic factors, and the coping strategy of community adaptation (P<0.05). Based on empirical research, access to social capital is critical in fostering community adaptation through its social participation, network, trust, coping strategies, and cooperation.

Conclusions

In conclusion, social capital, demographic factors, and coping strategies are significant factors in developing community adaptation of people with severe mental illness.
Instrumental Music Therapy Reduced Depression Levels in Stroke Patients
Authors: Sumakul Vione Deisi Oktavina , Notobroto Hari Basuki , Widani Ni Luh , Aima M. Havidz
Published: July 2020

Background

Stroke is the fifth cause of death and disability, leading also to depression. However, depression in stroke patients is hardly handled optimally. The purpose of this study therefore is to determine the effectiveness of instrumental music therapy in reducing depressive symptoms in stroke patients.

Design and methods

It used a quasi-experiment pre-post design with a simple random sampling with 59 respondents. The respondents were divided into 3 groups as follows; group A (standard treatment), group B (instrumental music therapy), and group C (combined treatment).

Results

The results show that the combined treatment provided the most significant influence on reducing the level of depression (P=0.001) with a contribution of 68.6% compared to the group A which was given standard treatment (P=0.001) with a contribution of 61.7%. Instrumental music therapy had no effect (P=0.986), though it contributed most among the three interventions, specifically 82.6%.

Conclusions

The study recommended further improvement to include music as treatment options for reducing depression among stroke patients.
Los principales aspectos del problema de sexo y elementos de género de la estructura.
Authors: Gizkhanim Nizamaddin Gahramanova.
Published: July 2020

El artículo trata sobre el problema de la organización de la situación de conducta en el contexto de las ideas normativas sobre las acciones y actitudes correspondientes a la categoría de pertenencia a un género en particular. La teoría de la construcción social de la realidad y los sistemas de género consideran al género como un factor de socialización de la sociedad, permitiendo preservar y desarrollar valores culturales. El problema de género se define como una actividad comunitaria sobre la atribución de género, que reproduce las relaciones de discriminación y desigualdad, y es un proceso que nunca se detiene.
Desarrollo de soporte informativo para el sistema nacional de emprendimiento innovador.
Authors: I.A. Khasanshin  , A.B. Shtrikov.
Published: July 2020

El documento aborda los problemas del apoyo a la inversión en infraestructura regional e indica que es necesario crear sistemas de innovación nacionales y regionales para acelerar la actividad de inversión. Se propone un modelo de sistema de innovación regional que incluye un centro de coordinación basado en el gobierno electrónico y se indican los resultados esperados de la implementación. Se consideran las principales funciones y procesos del infraestructura del sistema de innovación y se analiza la eficacia de la creación de empresas innovadoras, la comercialización de los resultados de las actividades científicas y la prestación de servicios a las empresas. Se considera la interrelación de subsistemas de apoyo de empresas innovadoras con organismos gubernamentales, empresas, instituciones científicas y educativas.
La mentalización y el funcionamiento reflexivo: aparición y desarrollo en la Psicología Clínica.
Authors: Fatemeh Abbasi  , Mohammad Ali Goodarzi  , Mehdi Reza Sarafraz.
Published: July 2020

Este estudio tiene como objetivo definir y explorar el surgimiento y desarrollo de lo mentalización y el funcionamiento reflexivo. El funcionamiento reflexivo se refiere a los procesos psicológicos que son sustanciales para la mentalización. Este es un estudio de revision y tiene como resultados que la mentalización y el funcionamiento reflexivo son diferentes de otros términos relacionados con la comprensión de los estados mentales tales como los pensamientos, los sentimientos, etc. El déficit en la mentalización y el funcionamiento reflexivo da como resultado problemas interpersonales fundamentales. Dado a que la mentalización y el funcionamiento reflexivo son capacidades que se está formando y desarrollando desde el nacimiento y con la relación con los demás; es crucial que se tengan en cuenta en la investigación y la práctica clínica.
El caso del asesinato de Benazir: encuesta literaria de las noticias e informe de investigación (de los años 2007 al 2008).
Authors: Sharjeel Naveed  , Huma Nisar  , Noreen Aleem  , Syeda Maliha Begum.
Published: July 2020

Se cree que los informes de investigación son la columna vertebral del Periodismo, trae la verdad en foco, detrás de la historia, y por lo tanto, los informes de investigación tienen gran importancia entre las masas. Este trabajo es realizado por un reporte de investigación. Los periodistas del Washington Post, Bob Woodward y Carl Bernstein escribieron la verdadera historia sobre "El escándalo de Watergate" y la renuncia forzada del presidente Richard Nixon. Se pueden introducir cambios positivos en la sociedad a través de dichos informes; por lo tanto, la cadena de tragedias inquisitivas como el asesinato de Liaquat Ali Khan, el ataque militar a Egipto desde Israel, el apoyo Pakistaní a Israel y el Reino Unido, el acuerdo de defensa con los EUA, la guerra con India, la guerra de 1971 y la separación de Pakistán Oriental y muchos otros, tuvieron lugar en la historia pero la gente de Pakistán nunca llegó a conocer la verdad, excepto los rumores y las noticias falsas.
Presentación del discurso directo e indirecto en H.M. El niño de casa de Naqvi: un estudio basado en corpus.
Authors: Uzma Sadiq  , Masroor Sibtain.
Published: July 2020

El artículo trata de averiguar la presentación del discurso en H.M. La novela de Naqvi, Home Boy. El estudio se basa en el corpus y se limita a la investigación de formas directas e indirectas del habla solamente. Las frecuencias de ambas categorías se analizaron mediante medidas cuantitativas y su función en el corpus seleccionado se discutió cualitativamente. Los hallazgos revelaron que la forma directa del habla es más frecuente en comparación con el discurso indirecto que resulta en la inmediatez y la dramatización de la novela.
Investigación de los factores motivacionales y de barrera del participante en los programas de educación continua de la comunidad médica de Mazandaran y sus agentes relacionados.
Authors: Mostafa Ataei  , Maryam Javadian  , Mohammad Khodemloo  , Hasan Siamian  , Saeid Saffarian Hamedani  , Farshideh Zameni.
Published: July 2020

La educación continua es esencial para aumentar el nivel de conocimiento científico, técnico y práctico de nuevas técnicas y nuevas direcciones de los estudiantes. Este fue un estudio transversal. La población fue de 784 personas y con el uso de la fórmula de tamaño de muestra, se seleccionaron 338 personas. El instrumento de investigación incluyó una lista de verificación válida. Para el análisis de datos se utilizó el software SPSS. Los resultados mostraron que la motivación de aprendizaje tuvo el mayor nivel de significación en un 86.5%. De los cinco factores inhibidores, la única causa de retención de tiempo inapropiada de los programas obtuvo la mayor importancia de p=0.01; por lo que es esencial aumentar la motivación organizativa de los participantes de diferentes maneras.