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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. 1 No. 2 (2019): Journal of Technomaterial Physics" : 10 Documents clear
The Scheme of Stress Detecting Tools by Using HIR333, GSR and DS18B20 Censors Based On Microcontroller Atmega 8 Tamba, Takdir
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1279

Abstract

A human stress detector has been designed with the physiological parameters of stress. Stress is a common respond to the demands of the body. There is a necessity for self adjustment, thus it causes disturbance in body’s equilibrium. Nowadays, stress is not only experienced by the elders, but also young people. Stress also affects the condition of the body. When someone is stressed, the body will hold integrated reactions against the stressors. These reactions include the increasing heart rate, fast breathing, and cold sweating. The detector works on the condition of the body by using a GSR sensor to determine the conductivity of the skin, HIR333 to detect changes in heart and body temperature DS18B20, which then compared with the specified parameters.
Effect of Thiourea as a Doping for Nanotitania Rafidiyah, Nabilah
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1280

Abstract

Sulphur-doped TiO2 samples were prepared by sol gel method using thiourea as sulphur source. The amount of thiourea solutions are 0; 0.5; 1.0; 1.5 and 2 ml, respectively. Sulphur-doped TiO2 was calcinated at 450°C. Sulphur-doped TiO2 and pure TiO2 were characterized by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM). Photo catalyst tests were carried out under sunlight and UV lamp. Based on XRD characterization, the samples are anatase phase. Furthermore, particle size was calculated using Scherrer equation and results of 8.94 and 12.98 nm, respectively for TBT-1.5 and TBT-0.5. TEM characterization showed that particle size of sulphur-doped TiO2 and pure TiO2 are 8.6 and 12.5 nm. Compared to TiO2 without doping, sulphur-doped TiO2 has a better photo catalyst activity for degradation of remazol golden yellow under visible light.
The Analysis of Hydrophobic Interaction on Aspergillus Niger Xylanase Enzyme Thermal Stability Malau, Nia Daniaty
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1281

Abstract

Xylanase is a type of enzyme that has an important role in the industrial field. One measure that can be done to improve the thermostability of an enzyme is by protein engineering. The mutation of the protein can be done by studying protein structures through molecular dynamics simulation approach. In this research, thermal stability analysis on Aspergilus niger Wild Type Xylase (AnX) was performed which aims to study the thermal stability characteristics of xynalase enzyme from Aspergillus niger through molecular dynamics simulation approach. AnX molecular dynamics simulation was performed by NAMD (Not Just Another Molecular Dynamic) software at 300 – 500 K. The research was focused on the study of enzyme thermal stability characteristics in order to get the information of residues accountable for such characteristics. The selection of residues to be mutated was based on hydrophocic interaction analysis. Then from that, the design of xylanase enzyme mutant with better thermostability than wild type xynalase enzyme was made in order to provide design reference for more stable xylanase mutation design which can be implemented in wet experiments for of Aspergillus niger Xylanase enzyme genetic engineering. The enzyme was unfolded at 500 K at 9.5 ns. The residues responsible of the thermal stability were based on hydrophobic interaction analysis in Alanin at residue 60. This residue is located in segmen/chain 3. The best mutant is Alanin 60 residue mutant which is replaced by Methionin and ∆∆Gsolv of -21.10345 was obtained. Thus, Ala60Met is the most stable mutant which might increase the thermal stability of Aspergillus niger Xylanase Enzyme.
The Fabrication of Roof Tiles Utilizing Palm Oil Boiler Ash and Used Rubber Thread Fibers Waste Achiruddin
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1283

Abstract

Polymer composite roof tiles are produced from palm oil boiler ash and used rubber thread fibers waste. The material was strengthened by asphalt through a molding and pressurized conventional technique of sand, palm oil boiler ash waste, rubber thread fibers waste, asphalt and epoxy resin mixture. The composition of boiler ash and rubber thread fibers varied of 20% : 0%, 18% : 2%, 16% : 4%, 14% : 6%, 12% : 8%, 10% : 10%. The results were tested for physical (density and water absorption), mechanical (compressive, impact and tensile strength) and thermal (Differential Thermal Analysis) properties. The characterization shows that the optimum mixture of sand, ash, thread, asphalt and resin compositions are 55% : 12% : 8% : 10% : 15% respectively, with the highest density of 1.64 gram/cm3, waster absorption value of 1.72%, 77.68 kJ/m2 impact value, 19.373 MPa tensile strength and 360°C for differential thermal analysis temperature. Those results meet the SNI standard for existing roof tiles. This shows that the materials used in the research can be a cheap and environmentally friendly alternative to roof tile raw materials.
Difference in the Amount of Voltage between Solid and Liquid Form of Bilimbi Fruit as an Alternative Energy Source Elisa
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1284

Abstract

The present study aimed to discover whether there was a difference in the amount of voltage between liquid bilimbi and fresh bilimbi fruit as an alternative energy source. The research samples were 100 grams of fresh bilimbi and 100 grams of liquid bilimbi. The samples were connected to a multimeter through zinc plate and copper plate using a crocodile clip cable. After connected, the voltage measurement of the bilimbi was carried out five times in order to obtain accurate data. The collected data were averaged, and the difference between the two samples was calculated. The results showed that the average amount of voltage from liquid bilimbi was 0.72 V while the average amount of voltage from fresh bilimbi was 1.42 V. Thus, the difference between the two forms of bilimbi was 0.7 V. In conclusion, there was a difference in the amount of voltage produced by liquid bilimbi and fresh bilimbi fruit as an alternative energy source in which fresh bilimbi fruit had a higher amount of voltage than the liquid bilimbi.
The Correlation of Blood Glucose Levels Measurement by Using Laser Speckle Imaging (LSI) Method Zulkarnain
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1285

Abstract

Laser Speckle Imaging (LSI) method is the imaging of light interference events when it interacts on a rough surface. A laser beam which entered the surface of skin will experience reflection, refraction and scattering. Interaction between a laser beam with the surface of the skin when entering to membranes blood, provides contrast information that were resulted from the rays scattered in a certain position, recorded by a CMOS camera and translated by imageJ program. A picture will provide an information of the intensity from certain skin areas with dark light pattern which keeps blind due to the presence of blood flow that does not dwell. The result of contrast imaging was validated with direct measurement by blood glucose device. The objects were people with the age range of 17 until 63 years old. This study aims to find the correlation between contrast Speckle to blood sugar levels in the human body. The result revealed that correlation between contrast intensity of red, green and blue to glucose level are 0.3275; 0.3165; 0.3050 respectively, and then correlation between contrast intensity to age are 0.6410; 0.6554; 0.6526. The data indicated high correlation on contrast to age and average correlation on contrast to glucose blood level.
The Production of Rencong Souvenir Based on Reused Brass Metal Waste Farhan, Ahmad
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1286

Abstract

The Traditional metal forming in fabricating rencong as souvenir requires high demands of energy, time, and accuracy skills from the blacksmith, but the quality that has been obtained is quite low, which includes colors diversity, and non-uniformity of brightness. The raw materials of brass metal are importantly needed for manufacturers, so that the cost of productions is relatively expensive. This study aims to improve the technology for fabricating rencong souvenir, which is expected to increase the production efficiency as well as conserving and improving the cultural and economic sectors. The simple casting techniques were conducted to be taught to the craftsmen from designing, mold and field training. This technology was able to be adopted very well by the craftsmen, while the rencong blades were produced in large scale by utilizing the brass metal waste. The diversity of sizes and shapes were obtained in small size and shapes blades, and the uniformity of color brightness was produced, so that the quality of souvenirs increases. Thus, the application of this technology can increase the income of craftsmen and the quality of souvenirs.
The Fabrication and Characterizations of Coal Briquettes Composed by Charcoal – Clay – Rice Husk Ashes and Adhesive Sembiring, Manis
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1287

Abstract

Coal briquettes are solid materials that can be used as fuels. The composition of this solid fuels are mixed by clay as the ashes binder, rice husks powder as flame additives, and starch flour as adhesive materials. These materials were prepared in different ratio to be mixed homogeneously which are determined accordingly. The fabrication was conducted by mixing methods, and pressed by hydraulic press within 3100 KPa. The results were placed inside an oven to be dried for 24 hours within 85oC of temperature, followed by 24 hours of allowing standing in room temperature. Afterward, the characterizations of the coal briquettes were done by performing density and compressive strength, while the others physical properties such as specific heat, combustion, and purity properties were also tested. The physical properties showed that coal briquettes are flammable and high ignition characteristics. The stability and speed of combustion to fire have continuous and fixed combustion indicated by the presence of solid ashes. The samples suggested that the M1 samples provided fragile ashes with mass loss accounted for 56.33%, and it has the highest specific heat values accounted for 246.66 Kcal/Kg. Meanwhile, the lowest specific heat value was 162.26 Kcal/Kg which was M4 samples with mass loss for 34.53%.
Diffraction Pattern Simulation of Crystal Structure towards the Ionic Radius Changes Via Vesta Program Rini, Ari Sulistyo
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1288

Abstract

The Simulations of X-ray diffraction patterns of MgO, BaO and ZnS ceramics were successfully performed by VESTA program, based on the crystal structures visualization. The aim of this research was to obtain the relationship between ionic radius to the diffraction pattern. The X-ray diffraction pattern was generated from visualization of the crystal structure. The crystal structure information was obtained from JCPDS data which contained lattice parameter, atomic coordinate and the space group. The X-ray diffraction pattern parameters which are taken into account in this research are diffraction angle of 2 Theta and Intensity. The results indicated that the peak position and intensity of the diffraction pattern are influenced by ionic radius of the cations. Structural transformation was also detected from this simulation.
A Study of Strength Activity Index of Pozzolan and Silica Sand with Ordinary Portland Cement Using ASTM C595 / C595M-12 Method Susanti, Nova
Journal of Technomaterial Physics Vol. 1 No. 2 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i2.1289

Abstract

Strength Activity Index (SAI) is a method that aims to see the quality of additional materials mixed into the cement. The additional materials examined in this study were pozzolan from Lubuk Alung, pozzolan from Sicincin, and silica sand from Payakumbuh. This study refers to the ASTM C595/C595M-12 standard. The process started with placing specimens and mold (on a base plate) in a humid room or closet and protecting the surface from water droplets. After the mold was removed from the humid room or closet, the cubes were removed from the mold. The cubes were placed in suitable metal or glass containers, and the containers were sealed and stored at a temperature of 38.0±2.00C for 27 days. The specimens were cooled to 23.0±2.00C before the tests were carried out. The compressive strength results of pozzolan from Lubuk Alung, pozzolan from Sicincin, and silica sand from Payakumbuh were 327 kg⁄cm2, 296 kg⁄cm2 and 199 kg⁄cm2 respectively. Thus, the specimens which fulfilled the SAI requirement according to ASTM C-618 were pozzolan from Lubuk Alung and pozzolan from Sicincin with 91.34% and 82.68%, respectively. In contrast, silica sand from Payakumbuh did not fulfill the requirement of ASTM C-618 at a minimum of 75% because the result obtained was only 55.58%.

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