bluuebunny/crossref_metadata_2025_split huggingface dataset:
3D-Modelling and Casting Simulation for The Fabrication of Megaprostheses Implant by Vacuum Centrifugal Casting
Authors: Suharno B. , Supriadi S. , Sutiyoko  , Setyawan D. , Rahmatulloh W. M. F. , Ramahdita G. 
Published: November 2019

Abstract
Recently, a high number of bone fracture incidents per year urges researchers in developing megaprostheses as artificial body parts. However, the complicated design and requirements for this custom-made prostheses are the key challenge. In accordance, this study focused on the preparation steps of 3D-modelling and casting simulation for the fabrication of megaprostheses implant by vacuum centrifugal casting. The reconstruction steps of 3D-modelling were started by observing the medical image data (i.e. CT-scan images). As the 3D-modelwas ready, the gating system was designed by placing two mandible bone models as the casting part with sprue and ingates where the design was respected to the gating system design for centrifugal casting. Moreover, the variation of casting part position,numbers, shapes and dimensions of the ingate, as well as the total surface area of ingates (Si) was applied while creating the gating system designsfor casting simulation. Chemically Pure Titanium (CP-Ti) with the pouring temperature and time of 1700°C and 4s, respectively, were used as the parameters for casting simulation. The solidification test results showed that the shrinkage cavities tended to decrease in volumetric scale with increasing the total surface area of the ingates, while the casting part position, number, shape, and dimension of ingate showed the difference in effectivity of the solidification of molten metal on the shrinkage cavities formation.
Reduced Remanence to Coercivity Increase Ratio of Pr11,76xDyxFe82B6 (x = 0; 1; 2; 3) Permanent Magnets
Authors: Sudrajat Nanang , Wisnu A , Manaf Azwar 
Published: November 2019

Abstract
Dysprosium substituted Pr-Fe-B permanent magnet samples with Pr11, 76-xDyxFe82B6 (x = 0, 1, 2 and 3) composition were made up by compacting the crystalline fine powders prepared through mechanical milling and successive high power ultrasonic irradiation. The (Pr,Dy)-Fe-B alloys with designated compositions were obtained from arc melted the charges that consisted of respectively Dy-Fe, Fe3B alloys and pure Fe and Pr metals. Results of the xrd analysis are permanent magnetic samples confirmed that the mass of the compound fraction formed is 90.07%. A change in lattice parameter of Pr2Fe14B phase occurred when Pr was partially substituted by Dy. Furthermore, the effect of dy partial substitution on magnetic properties can increase the coercivity value, but with a decrease in saturation magnetic. Dy = 3 substitution produces coercivity and remanence values of 160 kA/m and 0.275 T respectively in the permanent magnet category.
Synthesis and Deposition of High Crystallinity Cu2ZnSnS4 (CZTS) Using Dip Coating Method
Authors: Mizan Adlan , Rahman Fathur , Munir Badrul , Subhan Achmad 
Published: November 2019

Abstract
Kesterite Cu2ZnSnS4 (CZTS) thin film was successfully obtained using simple dip coating Synthesis of CZTS consist of mixing copper chloride, zinc chloride, tin chloride, and thiourea into a mixture of ethanol and ethanolamine to make CZTS suspension. Soda lime glass was used as a different substrate for dip coating method. Dip coating method uses 3 cycles of dip and drying at 170°C to remove ethanol and ethanolamine and then the sample was annealed at 550°C in argon atmosphere. X-ray diffraction was used to check the formation of kesterite before and after annealing. After annealing the diffraction pattern shown high crystallinity of kesterite with little secondary phase. Using Scherrer equation we can predict the crystallite size of CZTS before and after annealing. The scanning electron microscope was used to show the morphology of the CZTS before and after annealing. It is shown that although the grain was distributed homogenously a void can be seen throughout the surface. Optical properties of samples were checked before and after annealing using UV-vis Spectrometer. The result shows that dip coating method could create a good properties CZTS.
Separation of Cerium from Neodymium Hydroxide Concentrate Through Decomposition and Leaching Using HNO3
Authors: Purwani MV , Triyono  , Setyadji M , Amiliana RA 
Published: November 2019

Abstract
The thermal decomposition or calcination of neodymium hydroxide concentrate product by pilot plant of REOH into CeO2, La2O3 and Nd hydroxide concentrate in Center for Accelerator Science and Technology has been performed. From the result of start-up and validation was obtained neodymium hydroxide concentrate which still containing of impurities especially Ce. The purpose of this research to separate Ce from Nd(OH)3 concentrate by thermal decomposition to form Nd oxide (Nd2O3). Calcination temperature was 1000°C, and variation of time. The result of calcination were dissolved using aqueous HNO3 with molarity variation and the level of leaching was five times. From the results, it can be stated that calcination could convert Nd(OH)3 concentrate to Nd2O3 concentrate. Cerium hydroxide was easy dissolve in aqueous HNO3 while CeO2 couldn’t. The longer of calcination time, the formed of Nd2O3 is more perfect. The results of 3 hours calcination for the %weight of La increase until 12,50%, Ce increase to 10,42% and Nd increase to 52,08%. The composition of La in solid of leaching products use 1 M HNO3 with five leaching times is 3,57%, while Ce is 50.26% and Nd is 0.36%. The kinetic calcination and leaching followed reaction control.
The Role of Heat Treatment on Characteristics of Mg-Al-Sr Reinforced Nano-SiC Composite
Authors: Sartika Vioni Dwi , Trinanda Achmad Fauzi , Syarif Rama Aditya , Limouswan Ivan Orlando , Zulfia Syahrial Anne 
Published: November 2019

Abstract
The effect of heat treatment on microstructure and mechanical properties of SiC/Mg-Al-Sr alloy matrix composite was investigated. The heat treatment involved annealing at 425, 375, and 325°C for 4 hours, water quenching then ageing at room temperature for 48 hours. The heat treatment process caused dissolution ofs Mg2Si precipitated and decomposition of nano-SiC particles. The composites with 0.15 Vf-% nano-SiC which was treated at 425°C has reached the optimum hardness due to precipitate of the intermetallic phase. Besides, the hardness of the treated composites still has good ductility. The fracture surface of the composite consisted of numerous dimples as a result of micro voids nucleated at the interface between the matrix and SiC particles and second-phase particles as well. The fracture of heat treated composite was similar to microvoids which were nucleated mainly on nano-SiC particles as obtained during fractography analysis.
The Influence of Spray Distance of Thermal Sprayed Aluminum (TSA) on its Corrosion Resistance and Bond Strength
Authors: Riastuti Rini , Bancin Bravola A H , Rahmat Zamri , Siallagani Sonia T 
Published: November 2019

Abstract
This study investigates the ideal spray distance to result in a high quality aluminum coating on 316L stainless steel substrates. Thermal spray process is used using Aluminum as the coating material, well-known as TSA (Thermal Sprayed Aluminum. To get high coating quality must do the coating using proper parameters, one of them is the spraying distance. In this investigation is want to observe the influence of the spray distance on corrosion resistancea and its bond strength. the spray distance variants 10, 20, and 30cm. To evaluate the corrosion resistance and the bond strength of thermal sprayed aluminum, the researchers apply a salt spray and mechanical pull-off test. The result shows that the spray distance of 20cm produce the strongest corrosion resistance and the highest bond strength, 12.5 MPa.
Synthesis and Characterization of Biochar from Crab Shell by Pyrolysis
Authors: Nasir Muhamad , Rahmawati Triannisa , Dara Fitri 
Published: November 2019

Abstract
Carapace, which is part of the crab shell exoskeletons were analysed through structural and chemical methods. This material was compared between grinded and ungrinded process. This two processes resulted product called biochar. SEM-EDS, FT-Ir, XRD, TG-DSC, AAS, and PSA were conducted to characterized biochar. The SEM images showed different in biochar particles size. The composition of biochar differ for each pyrolyzed temperature, where Ca was the dominant element and C was the poor element. FT-Ir spectra provided different spectra for biochar prepared at 500-600 °C and biochar prepared at 700-900 °C. XRD data showed that calcite and lime-based biochar depend on pyrolyzed temperature. Thermal analysis generated that biochar decomposed into three main stages. Otherwise, biochar through grinded step give resemble result as like biochar without grinded step, but has smaller particle size, which means grinded process did not give significant effect both structural and chemical composition, but give any effect on particle size. Furthermore, these study indicate that biochar potentially can be used as adsorbent.
Mechanical Properties and Microstructure at Stainless Steel HAZ from Dissimilar Metal Welding After Heat Treatment Processes
Authors: Ramdan Raden Dadan , Kariem M Agus , Neswan Oki , Wiriawan Fadhil , Suratman Rochim , Widyanto Bambang , Wirawan Riza 
Published: November 2019

Abstract
Metallurgy of HAZ at both metals after dissimilar metal welding is important to be evaluated, because differences in metallurgical characteristics due to heating effect on bothHAZ might take place after the process. For the case of austenitic stainless steel, metallurgical aspects that should be considered after welding are the formation of chromium carbide (sensitization) and delta ferrite phase. In the present research, focus is given on the HAZ microstructure and hardness both after welding and post-heat treatment process. Microstructure observation was carried out by optical microscope and Scanning Electron Microscope (SEM), whereas hardness testing was carried out by micro-Vickers method. From this study, it can be concluded that the increase in heat treatment temperature can reduce the volume fraction of delta ferrite and chrome carbide precipitation, whereas hardness at the HAZ region decreases after the heat treatment.
Effect of the Processing Parameters on the Shrinkage Defect Using A High-Pressure Die-Casting Process
Authors: Rahmalina Dwi , Sukma Hendri , Andry  
Published: November 2019

Abstract
Effects of the processing parameters of a high-pressure die-casting (HPDC) process on the shrinkage defect of housing block compressor (HBC) were examined in this research. Because of the reduction of defect can increase the productivity of HBC that representing a good quality product, the processing parameters determining the quality of product must be optimized. In this study, the processing parameter of high speed in the range of 3.97 to 4.97 m/s and that of fast start point in the range of 293 to 333 mm were calculated and then the HBC samples of using the Al alloy of ADC12 were produced through the HPDC process. The shrinkage defects on HBC were characterized by visual inspection, radiography testing and microstructure examination. The result showed that the best parameters for reducing shrinkage defect of HBC by the HPDC process are 4.97 m/s of high speed and 313 mm of fast start point. The optimum parameters of high speed and fast start point were verified to contribute to producing a high quality of the HBC for the applications in automotive engine.
Relaxation Behavior of Natural Rubber Composites Through Recovery Measurement after Tension and Compression Set
Authors: Indrajati I N , Setyorini I 
Published: November 2019

Abstract
Relaxation behavior of natural rubber (NR) composites in term of the recovery after tension and compression set had been successfully studied. The effect of crosslink density, either physical or chemical, on the recovery percentage was evaluated. Filler carbon black N-330 and sulfur crosslinking agent were varied for this purpose. N-330 loading ranging from 30, 35, 40 and 45 phr with baseline of 2 phr sulfur. Meanwhile, sulfur loading ranging from 1, 2, 3 and 4 phr with the baseline of 30 phr N-330. Tension set was performed on constant elongation with 25, 50 and 100% strain. The measurements were performed at 100°C for 72 h. While compression set was carried out in constant deflection 25% of initial thickness, carried out both at room temperature and 100°C for 72 h. The results findings showed that the tension set was independent to crosslink densities, but greatly depended on the strain level. Low strain level provided higher recovery percentage. The filler increment markedly increased the compression set, but sulfur tended to improve it. Compression set was higher at elevated temperature since the deterioration not only generated by physical process but also by chemical oxidative thermal process.
Shape Memory Behavior Of Shape Memory Natural Rubber
Authors: Setyadewi N M , Indrajati I N 
Published: November 2019

Abstract
Natural rubber compound with different blend ratios of sulfur was prepared. Fabrication of shape memory polymer by swelling natural rubber compound with palmitic acid at 75 °C (100 wt% palmitic acid loading). Shape recovery experiments run by stretching to 100% (1 hour) at permanent set after heating treatment in a water bath (75°C for 30 s) and then freezing in 10°C water for 30 s. The samples were subsequently reheated in a water bath to recover the permanent shape (three stretching cycles). Shape memory compound swollen palmitic acid exhibited shape recovery of 96-100% and shape fixity 57-98%. Repeated shape recovery cycles had little effect on its shape memory property and mechanical property.
Fabrication and Characterization Of Poly Lactic Acid (PLA)-Starch Based Bioplastic Composites
Authors: Abdullah Akbar Hanif Dawam , Fikriyyah Anti Khoerul , Putri Oceu Dwi , Puspa Asri Putri Putih 
Published: November 2019

Abstract
In this study, to make a good bioplastic composite, starch-based bioplastic is produced by adding polylactic acid (PLA) to improve its properties. PLA was added into starch-based bioplastic with various concentrations of 0, 3, and 10 wt.%. The extrusion was performed at 90-150 °C and compression moulding process was conducted at 150 °C and pressured at 50 kgf/cm2. Bioplastic composites have been characterized to know its properties. FTIR analysis indicated shifting and increasing spectra of interaction between PLA and starch-based bioplastic. Contact angle and solubility analysis revealed that adding PLA can increase the stability of hydrophobic characteristic and insoluble properties. The combination of PLA and starch-based bioplastic can improve the mechanical properties. In addition, thermal properties of bioplastic composites have a better thermal stability and produce a lower melting point thus the energy needed to melt for bioplastic composites becomes milt as raising PLA composition. The density of bioplastics was in the range of 1.2 - 1.3 g/cm3 that would be good for light bioplastic. The results of this study showed that the combination of starch-based bioplastics and PLA at low concentration (10wt.%) potentially could enhance the properties of bioplastic composites for food packaging.
Growth of ZnO Nanorods Synthesized via Chemical Bath Deposition at Different Reaction Times and Precursor Concentrations
Authors: Sofyan Nofrijon , Panjaitan Sadra Partogi , Herman Yuwono Akhmad 
Published: November 2019

Abstract
The characteristics of ZnO grown via chemical bath deposition on an FTO glass substrate at different reaction time and precursors concentration have been examined. The ZnO seed was firstly spin coated at 500 rpm for 5 seconds onto an FTO glass substrate and then at 3000 rpm for another 30 seconds. The coated substrate was heated at 130 °C to remove the solvent. The growth of ZnO nanorods was performed via chemical bath deposition (CBD) at various precursor concentrations and reaction times. The morphology of the obtained ZnO nanorods were characterized using a field-emission electron microscope (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDX) to reveal the morphology and elemental composition of the nanorods, whereas X-ray diffraction (XRD) was used to examine the crystal structure. The results showed that the ZnO products have nanorod structure and sizes for each concentration. The results of this morphology were supported by the results from XRD. XRD patterns revealed that the formation of nanostructure of ZnO has been obtained at the reaction time of 2 hours, however, the optimum formation time was proven to be at 3 hours. The results also revealed that ZnO nanorods with a precursor concentration of 0.0375 M has the optimum formation of ZnO nanorod in terms of size and distribution of the nanorods.
Study of Al-Zn-Cu-Sm Efficiency for Low-Voltage Sacrificial Anode Candidate
Authors: Ferdian D , Sibuea J A , Dharmawan Y R , Pratesa Y 
Published: November 2019

Abstract
Sacrificial anode is one of the most effective methods for preventing corrosion in seawater environment. Aluminum (Al) anode works very well in seawater environment with high electrochemical capacity and high driving voltage. Commonly used aluminum alloy sacrificial anodes have the possibilities to trigger the occurrence of Stress Corrosion Cracking and Hydrogen Embrittlement due to overprotection on high-strength steel. The low voltage sacrificial anode was developed to overcome this problem. Electrochemical behavior of Al-5Zn-0.5Cu alloy with varied samarium (Sm) addition of 0.02 wt% and 0.1 wt% was investigated in this study. The commonly used Al-5Zn-0.02In alloy is also tested as a comparison. Anode efficiency test with weight loss method according to DNVGL-RP-B401 standard was conducted to determine the performance of Al-5Zn-0.5Cu-xSm alloy. The addition of 0.1 wt% Samarium shows the best anode performance with electrochemical capacity 2809.80 Ah/kg and 98% efficiency. Al-5Zn-0.5Cu-0.1Sm alloy is the most potential alloy to be developed as a low potential sacrificial anode to replace commonly used aluminum sacrificial anode with indium addition.
Effect of addition of OPC on Performance characteristics of Self-compacting Alkali activated slag concrete mixes
Authors: Manjunath R , Narasimhan Mattur C. 
Published: November 2019

Abstract
An attempt has been made in the present research to develop construction friendly, self-compacting, alkali-activated slag concrete mixes with ground granulated blast furnace slag (GGBFS) as the major source of binder material. In an effort to make the concrete mixes more eco-friendly and sustainable, by-products from Iron and Steel Industry such as steel slag sand and Electric Arc Furnace (EAF) slag aggregates, were used as the fine and coarse aggregates respectively. While the total binder content has been varied in the range of 700 – 800 kg/m3 (in increments of 50 kg/m3), all the trial mixes had a constant w/b ratio of 0.40. Different amounts of sodium silicate solutions, with specified amounts of sodium hydroxide flakes dissolved in them, are used as alkaline solutions, with the combined Na2O percentage in them varying between 6% - 8%. Test specimens were cast with mixes which showed enhanced flow-properties as per relevant EFNARC guidelines and were tested for their mechanical strength and durability characteristics. Effect of admixing of ordinary Portland cement (OPC) in smaller percentages (2.5% - 10 %, in increments of 2.5%), on the performance characteristics of this novel class of AAC mixes is evaluated. Increased cement contents are found to lead to better flow ability properties and higher strengths values with lower sorptivity values in all the Cement-Admixed, Self-compacting, Alkali-Activated Slag Concrete mixes (CASAASC mixes) tested herein. Studies with a scanning electron microscope have shown more densified morphologies developed, accounting for better performances of these mixes.
Influence of cold temperature on performance of concrete in J&K – Comparison studies
Authors: Dar A R 
Published: November 2019

Abstract
Cold weather concrete construction under sub-zero temperatures presents challenging problems for the professionals involved in construction industry and are the main reason for poor development of such regions. Freezing of concrete before it gains required minimum strength at early age together with considerable retardation in setting time due to freezing temperatures are the two major problems with cold weather concreting. The professionals in Srinagar, J&K also face the above problems during winter months and needs to be addressed with cost effective measures. Although there are many accelerators present in the market the performance depends on humidity and temperature changes in the region. Accordingly, a specific study related to performance of various accelerators under the average temperature range of -7°C to 7°C (prevailing during winter) was carried out for choosing the accelerator suitable for the region. The freezing and thawing effect on hydration of cement paste, initial and final setting time and strength gain were evaluated. The 3 day, 7 day and 28 day performance was compared to a standard concrete mixture without additives which served as baseline for comparison.
Phonon limited mobility in 3D Dirac semimetal Cd3As2
Authors: Amarnath R , Bhargavi K S , Kubakaddi S S 
Published: November 2019

Abstract
We report the numerical calculations of phonon limited electron mobility, μ in Cd3As2 three dimensional Dirac semimetal using Boltzmann transport theory over a temperature range 20<T<300K. By employing the Ritz iteration technique, we have directly solved the 3D linearized Boltzmann transport equation to obtain the first order perturbation distribution function Φ
−1(E

k
) as a function of electron energy E

k
and hence the mobility, μ. we have considered electrons scattering by acoustic phonons via deformation potential scattering and polar optical phonons. The μ due to the latter is dominating the former for T>80K, for electron concentration n
e = 1x1018cm−3. Thiscrossover shifts to lower T, with decreasing n
e. The calculations are qualitatively agreeing with the experimental results.
Improved performance of coal bottom ash co-mixtured concrete
Authors: Simran Satgurdev , Dar A R , Kumar Ravi , Adil Dar M , Raju J 
Published: November 2019

Abstract
The present research aims to prepare concrete by adopting coal bottom ash (CBA) as a replacement of fine aggregate. Various strength and durability tests were performed by replacing fine aggregate with CBA in percentages varying from 0-80%. To achieve workability requirement in specimens with higher CBA content, higher water to cement ratio was adopted, which lead to variation in the water absorption behaviour. The results indicated that addition of higher CBA content lead to drop in workability and plastic density. Furthermore, replacement of CBA above 40% leads to a drastic drop in strength characteristics. In addition, increasing CBA content improved drying shrinkage, standard consistency and water permeability of the concrete. Finally, the results confirmed that concrete can be effectively manufactured by judicious utilization of CBA as partial replacement of fine aggregate.