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Siti Utari Rahayu
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Journal of Technomaterial Physics
Published by TALENTA PUBLISHER
ISSN : 26560747     EISSN : 26560755     DOI : https://doi.org/10.32734/jotp
Core Subject : Science, Engineering,
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Journal of Technomaterial Physics (JoTP) is a peer-review national journal that is published twice a year, in February and August. JoTP provides an open access policy for the writer and free publication charge. Due to its open access policy, JoTP serves online publication and a fast review process. The scope of this journal are: 1. Theoretical Physics 2. Applied Physics 3. Material Physics 4. Computational Physics and Machine Learning 5. Experimental Physics 6. Nuclear Physics and Particle Physics 7. Biophysics and Medical Physics 8. Geophysics 9. Energy and Energy Conversion 10. Advanced Materials (photonics, nanomaterial and nanotechnology) 11. Electronics and Electrical Engineering 12. Metrology JoTP receives an original article with the maximal length of 10 pages and provides an open access policy for the writers and free publication charge.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "Vol. 2 No. 1 (2020): Journal of Technomaterial Physics" : 10 Documents clear
Manufacture and Characterization of Pandan Wangi (Pandanus amaryllifolius Roxb) Fiber-Based Composite Board with Epoxy Resin Sinuhaji, Perdinan
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5200

Abstract

The manufacture and characterization of pandan wangi fiber-based compositeboards with epoxy resin using random fiber orientation method, fiber length 4 cm, withfiber composition in grams (0, 0.1, 0.2, 0.3, 0.4, 0.5), mechanical and physical testing hasbeen carried out. The results obtained a tensile strength value of 52.26 MPa, flexuralstrength 49.74 MPa, impact strength 30.6 kJ.mm-2, density 1.07 g.cm-3, and moisturecontent 2.05%. The results showed that the mechanical and physical properties that meetthe JIS A5905: 2003 standard are tensile strength > 0.4 MPa, bending strength > 32 MPa,density 0.3-1.3 g.cm-3, and moisture content 5-13 %. Therefore, pandan wangi fibercomposite with epoxy resin can be applied to car bumpers.
Theoretical Study of Negative Material Bias Index Symptoms Simbolon, Tuaraja
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5204

Abstract

Theoretical research on the phenomenon of negative refractive index materialwas cunducted. The material is a known metamaterial that can manipulate electromagneticwaves through it. By changing the permeability and permittivity of a medium that is worthimaginary, then the value is included in the equation will produce a refractive index that isnegative. This value can be achieved through material forms are designed so that themagnetic field and electric field manipulation. The equation used on electromagnetic wavesthat Maxwell's equations, is revealed to be some similarities propagation magnetic field andelectric field. The Methods Finite Difference Time Domain (FDT D) as a modifier equationwas then equations analysis, simulated using MatlabR2014 program. Based on simulationresults, visible when the electromagnetic waves through a material metamaterial, the wavesare deflected, do not pass part of the material covered.
Management of Electric Field under the Sag of High Voltage Overhead Transmission Lines Sitepu, Mester; Rianna, Martha
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5261

Abstract

There have been many methods used to determine the electric field strength under the 150 KV overhead transmission lines (OHTL). Since it is simple and can be used for a homogeneous and multilayer medium, the method chosen for modeling the electric field under the OHTL is the complex image method (CIM). The results obtained show that the electric field strength obtained by the CIM is in agreement with that obtained by Complex Determine Method (CDM). Furthermore, the results obtained from the CIM model fit well with the field data. The OHTL height that must be raised so that the electric field strength under the OHTL will meet the WHO quality standards is 3 m at location A and 2 m at location B. These results show that modelling the electric field under the OHTL using CIM is exellent.
Study on the Production of Bonded Magnet NdFeB and Polyvinyl Butyral Mendrofa, Mareanus; Sinuhaji, Perdinan; Muljadi, Muljadi
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5263

Abstract

bonded magnet is composite magnet material made by mixing magnetic powder with non-magnetic binder. The process in manufacturing bonded magnet NdFeB made by mixing powder of neodymium iron boron (NdFeB) commercial type MQP-B with a polyvinyl butyral powder using a glass beaker. The comparisons of variation in composing NdFeB magnets powders with a binder of PVB (% weight) are 98:2, 96:4, 94:6 and 93:7 of 8 grams from total mass of the sample. After mixing the powder, it is molded by using a compression molding method with 8 tons pressure for 20 minutes at curing temperature 1600C. The molded samples are conducted by characterizing the physical properties which include measurement of density, microstructure analysis using SEM-EDX and magnetic properties which include measurement of the magnetic field strength using a Gaussmeter and hysteresis curve using VSM. The result of the study shows that the addition of and binder PVB in bonded magnet NdFeB causes a decrease in the density and magnetic field strength. The best result of density and magnetic field in the manufacture of bonded magnets is obtained by the addition of 2 % binder of 5.66 g/cm3 and strong magnetic field of 1862.4 G. the score of Mr = 72.86 emu/g, Ms = 103 emu/gram, Hc = 8.490 KOe and BHmax = 5.1 MGOe was obtained on the addition of PVB 2 %.
Synthesis of Lithium Mangan Oxide (LiMn2O4) Using Solution Method for Lithium Ion Battery Catodes Materials Priyono, Slamet
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5264

Abstract

Synthesis of Lithium Manganese Oxide (LiMn2O4) for Lithium Ion Battery Cathodes with Solution Method has been conducted. This experiment was carried out using the solution method. In this study, the synthesis was carried out by varying the calcination temperature. The raw materials used were Lithium Acetate (C2H3O2Li), Manganese Acetate (C4H6MnO4.4H2O), Hydrochloric Acid (HCl), and Ethanol (C2H5OH) as solvents which were dissolved to become LiMn2O4 precursors. Synthesis was carried out at calcination temperatures of 600oC, 700oC and 800oC, for 4 hours then pounded with a mortar until smooth. The characterization includes: The results of the STA test at 280oC-380oC showed a mass decrease of 11.9973% due to the release of mass of water vapor and decomposition of C4H6MnO4.4H2O raw material. XRD analysis shows that the increase in peak temperature of the LiMn2O4 phase intensity is getting sharper, the peak showing the impurity Li2O phase decreases. SEM analysis results show that the higher the calcination temperature, the larger the particle size is formed, because in the calcination process the densification process occurs.
The Effect of Holding Time Variations in MgB2 Superconductor with Addition Nickel Prepared by Powder in Sealed Tube Method Hendrik
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5265

Abstract

In this research, the effect holding time on the synthesis of MgB2 superconducting material with the addition of nickel has been carried out using the powder in sealed tube method. MgB2 is a superconductor which has a critical temperature of ~ 39 K. The addition of 0%, 4%, and 8% Ni was added to study its effect on the superconductivity characteristics of MgB2. The sample preparation process begins by weighing the raw materials in the form of Mg, B and Ni powders according to stoichiometric calculations. The material is then crushed for 1 hour using mortar agate then put into a stainless steel tube SS 316L and the PIST pressing process is carried out with a pressure of 5 MPa, then the sintering process is carried out using a muffle furnace with a temperature of 800ºC and holding time for sintering temperature for 1 hour, 3 hours and 5 hours. Samples were characterized by means of XRD, SEM-EDS and Cryogenic Magnet. The results of phase identification through XRD showed that the phases formed were MgB2, MgNi2.5B2, MgO, Mg and Ni. Morphological structure and elemental composition were seen through SEM-EDS. From the Cryogenic Magnet test, pure MgB2 samples with a holding time of 1 hour had a critical temperature Tc of 36.29 K and did not have Tc. Meanwhile, pure MgB2 at a holding time of 5 hours has a Tc of 42.18 K and a Tc of 25.55K.
The Effect of Al2O3 Doped and Carbon Coated Li4Ti5O12 on Structures, Morphology and Electrochemical Performance Priyono, Slamet
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5266

Abstract

In this research, Li4Ti5O12 anode with doping Al2O3 and carbon coating was made to determine the effect of doping Al2O3 and carbon coating on crystal structure, morphology and electrochemical performance. Li4Ti5O12 anode material consisting of LiOH.H2O and TiO2 was made with various samples of LTO without doping, LTO doped carbon, LTO doping Al2O3 and carbon using the solid state reaction method. All raw materials are mixed and milled using a Planetary Ball Miller for 2 hours then crushed to become a precursor to Li4Ti5O12. The Li4Ti5O12 precursor was sintered at 850°C for 4 hours. The final product was characterized using X-Ray Diffraction (XRD) to determine the formation of Li4Ti5O12 phases, Scanning Electron Microscopy (SEM) to analyze the morphology formed, and Cyclic Voltammetry to determine electrochemical performance. The results of XRD characterization were formed in the Lithium Titanium Oxide (Li4Ti5O12), Dilithium Titanate (Li2TiO3), and Rutile (TiO2) phases. The SEM characterization results on LTO doping carbon, LTO doping Al2O3 and carbon showed a coarser texture compared to the LTO without doping which had a fine texture. The electrochemical performance produced in LTO coating carbon has a slender redox peak in the first cycle, this shows that LTO coating carbon has good electrochemical performance compared to the Al2O3 and carbon doping LTO samples.
Efficiency of Ketapang (Terminalia catappa L.) Leaves Tannin Extract as Organic Inhibitor Against Corrosion Rate of Iron Metal in Seawater Marlianto, Eddy
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5268

Abstract

The research is about effect of immersion time and mechanical properties on the rate of corrosion of ferrous metals by the addition of Ketapang (Terminalia catappa L.) leaf extract as an organic inhibitor in the seawater environment. In this study, ketapang leaf extract was used as a natural inhibitor to inhibit the rate of corrosion of ferrous metals. This inhibitor is used on iron metal plates which are immersed in corrosive media, namely sea water with variations in the composition of the inhibitors used at 0; 10% V; 20% V, and 40% V, with immersion time of 3 and 6 days. The characterizations tested included measurement of density, corrosion rate, inhibitor efficiency, and hardness testing using the Vickers method. From the measurement results, the density value decreases with the addition of the concentration of the inhibitor both on immersion 3 days and 6 days. The value of hardness increases with increasing composition of the inhibitor. The optimum hardness value is 165.03 N/m2 with immersion time of 6 days at an inhibitor concentration of 40% and a minimum hardness value of 145.603 N/m2 on immersion 6 days with no inhibitor. The smallest corrosion rate was obtained by samples with a composition of 40% inhibitor of 2.77 mpy with immersion time of 3 days and 1.33 mpy with immersion time of 6 days. And the efficiency value of Ketapang leaf extract inhibitors reached 47.01 % in the composition of 40% in the seawater environment with immersion time of 6 daysketapang leaves
Design and Construction of the Oil Palm Fruit Sorting Device Based on Color with PC Display Tamba, Takdir
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5269

Abstract

This research discusses the design and construction of an oil palm fruit sorting tool and a counter for the number of oil palm fruits that work automatically using the working principle of a color sensor. This tool can work automatically because it is controlled by an ATmega328 microcontroller. Overall this system consists of designing a color sensor, motor controller, conveyor, and power supply. Item detection consists of 328 microcontroller technology, color sensor, proximity sensor, LCD, IOT, and PC display. The testing stages of this tool include testing the sensor circuit, testing the servo motor circuit, and testing the automatic oil palm fruit sorting and counting tool. When the oil palm fruit is detected, the color sensor will take data. The captured data will be sent to the microcontroller and displayed to the LCD, IOT and PC. There are additional devices in the form of undercooked, ripe and past ripe separation bars by utilizing a DC servo motor.ATmega328
Preparation and Characterization of Conductive Plastics Using Cassava Peel Waste and Addition of CuSO4 Humaidi, Syahrul; Simbolon, Tua Raja; Muliyati, Muliyati
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5272

Abstract

This study investigated the characteristics of a conductive plastic based on root starch and CuSO4 filler. The mixture variation was (95:5)%; (90:10)%; (85:15)%; (80:20)% and (75:25)%. Glycerol is used to change the material as desired (plasticizer) which is called a plasticizer. The method used in the manufacture of this material is melt intercalation. Mechanical testing includes tensile strength (tensile strength) and elongation at break. Thermal testing was done using DTA (Differential Thermal Analysis) and material conductivity testing. The characterization results showed that the optimum starch composition: CuSO4 (75:25)% had a conductivity value of 7.3 x 10-2S.m-1, a thermal test value of 410ºC. The optimum tensile strength value occurs in the composition (80:20)% with a value of 4.606 MPa

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