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W. Garinas,A. Fauzi,H. Hidayaturrahman,Q.N. Madra,Subari,D.M. Nurjaman,W. Hidayat,Y. Sudiyanto,N.V. Permatasari,Zulfahmi,Yurohman 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
The modern electrical industry in Indonesia faces escalating energy demands, projected to reach 1,413 Terawatt Hours by2060. Meeting these demands necessitates enhancing the quality of electrical transmission systems, particularly insulators, witha focus on local materials to reduce dependency on imports. Porcelain Alumina Ceramic Insulators (PACI) offer promisingalternatives due to their high resistivity and mechanical strength. This study investigates PACI synthesis using locally sourcedmaterials: kaolin, ball clay, alumina, and feldspar. Chemical analysis confirms alumina as the primary component (99.7%Al2O3), while other materials contribute to silica content. Fabrication involves crushing, drying, grinding, sieving, and sinteringat 1280 °C, yielding specimens (K1S, K2S, K3S). Material characterization employs XRD, XRF, SEM and electrical testsreveals phase compositions, morphological changes, and electrical properties. K3S, rich in feldspar, exhibits superior materialstrength (74.62 N/mm²) and hardness (190 N/mm²) with limited conductivity. Utilizing local resources for PACI productionpromises economic benefits and reduces import dependence. This study illuminates the interplay between material compositionand resulting properties, offering insights into ceramic synthesis for improved electrical infrastructure.
A. Taufiq,A. F. Muyasaroh,S. Sunaryono,H. Susanto,N. Hidayat,N. Mufti,E. Suarsini,A. Hidayat,A. Okazawa,T. Ishida,D. Darminto 한국자기학회 2018 Journal of Magnetics Vol.23 No.3
In this work, the soft-template technique was employed in preparing the superparamagnetic Fe₃O₄ nanoparticles from natural iron sand. A series of the Fe3O4 nanoparticles formed spinel crystal structure with the particle size in the range of 1.9 to 6.6 nm which was varied by diethylamine concentration as the template. All samples had the functional groups of Fe<SUP>3+</SUP>-O<SUP>2−</SUP>, Fe<SUP>2+</SUP>-O<SUP>2−</SUP> and OH and exhibited the superparamagnetic character. The antibacterial activity of the Fe₃O₄ nanoparticles showed a significant outcome to pathogen growth rate. Pre-administration of bacterial stock solution (E. coli and B. substilis) with magnetite significantly reduced the colony formation compared to control group. In particular, for Gram-negative bacteria growth rate, pretreatment with magnetite declined the colony formation considerably compared to placebo and positive control group. Also, in line with Gram-negative bacteria, the similar pattern of the bacterial killing property was observed in Gram-positive bacteria.
DERMAWAN, B.,HUDA, I.N.,WIBOWO, R.W.,HIDAYAT, T.,UTAMA, J.A.,MANDEY, D.,TAMPUBOLON, I. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
This work considers the elliptic restricted three-body problem under effects of radiation of the bigger primary, and an oblate spheroid for the smaller primary to mimic an exoplanetary system with a gas giant planet. Under the influences of both effects we look for the existence of the triangular equilibrium points and the influences of the radiation and oblateness on the locations and motion of the points. We set the system in a normalized rotating coordinate system and derive equations of motion for the third infinitesimal object. Our study shows that the effects modify the equilateral/isosceles triangle shape with respect to the primaries. The triangular points also have non-planar motion with period depending on the value of the planet oblateness.
Non-local orthotropic elastic shell model for vibration analysis of protein microtubules
Muhammad Taj,Afnan Majeed,Muzamal Hussain,Muhammad N. Naeem,Muhammad Safeer,Manzoor Ahmad,Hidayat Ullah Khan,Abdelouahed Tounsi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.3
Vibrational analysis in microtubules is examined based on the nonlocal theory of elasticity. The complete analytical formulas for wave velocity are obtained and the results reveal that the small scale effects can reduce the frequency, especially for large longitudinal wave-vector and large circumferential wave number. It is seen that the small scale effects are more significant for smaller wave length. The methods and results may also support the design and application of nano devices such as micro sound generator etc. The effects of small scale parameters can increase vibrational frequencies of the protein microtubules and cannot be overlooked in the analysis of vibrating phenomena. The results for different modes with nonlocal effect are checked.