Budhy Kurniawan - Academia.edu (original) (raw)

Budhy Kurniawan

Senior Lecturer and Researcher at Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia

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Papers by Budhy Kurniawan

Research Square (Research Square), Apr 5, 2023

Pengaruh Substitusi Cu Terhadap Sifat Kemagnetan dan Sifat Kelistrikan Material La0,7(Ba0,97Ca0,03)0,3Mn1-xCuxO3 (x = 0; 0,03; 0,05; 0,07 dan 0,10) = Effect of Cu Substitution on the Magnetic and Electricity Properties of Material La0.7(Ba0.97Ca0.03)0.3Mn1-xCuxO3 (x = 0, 0.03, 0.05, 0.07 and 0.10)

Journal of Physics: Conference Series, 2019

Aerosol and Air Quality Research

IOP Conference Series: Materials Science and Engineering

Physica B: Condensed Matter

Spektra: Jurnal Fisika dan Aplikasinya, 2016

Physica B: Condensed Matter, 2017

International Journal of Technology, 2016

MAKARA of Science Series, 2010

ABSTRACT Influence of output window reflections on oscillatory processes in gyrotrons has been st... more ABSTRACT Influence of output window reflections on oscillatory processes in gyrotrons has been studied. The processes in a gyrotron have been modeled numerically, and enhancement of the spectrum signal in the presence of reflections has been studied. Dependencies of output power versus time and frequency spectrum for different value of reflection coefficient are given. Possibilities of significant increasing of output spectrum are demonstrated experimentally. The results demonstrate significant influence of reflections on operation stability and composition of the output radiation of the gyrotron.Keywords: gyrotron, tunability, reflections, oscillation regime, radiation spectrum

Journal of Alloys and Compounds, 2013

ABSTRACT Magneto-transport and magnetic studies on the (1 - x)(La0.6Sr0.4MnO3)/xSb(2)O(3) (x = 0.... more ABSTRACT Magneto-transport and magnetic studies on the (1 - x)(La0.6Sr0.4MnO3)/xSb(2)O(3) (x = 0.00, 0.03, 0.07, 0.12 and 0.18) composite system are reported. X-ray and microanalysis results reveal that there is no evidence of reaction between the La0.6Sr0.4MnO3 and Sb2O3 grains. The Curie temperature T-C of the composite system remains unchanged; however, magnetization decreases with Sb2O3 addition. Metal-insulator transition temperatures (T-rho) are found to lie in the range of 298-324 K for the derived samples at zero applied magnetic field. The increase of resistivity (rho) is related to the influence of the grain boundaries on the electrical conduction process. The percolation theory is introduced to understand and improve the properties of these mixed systems. An enhanced magnetoresistance (MR) at the whole temperature range and under a low magnetic field is observed in the composites with x = 0.03. We argue that the MR improvement is ascribed to the enhanced magnetic disorder at interfaces and grain boundaries as well as to the suppression of enhanced spin-dependent scattering of the conduction electrons by the applied magnetic field.

日本物理学会講演概要集, Mar 15, 1999

CaSO4 phosphor doped Dy is used as dosimeter for application in low radiation dose. The CaSO4 : D... more CaSO4 phosphor doped Dy is used as dosimeter for application in low radiation dose. The CaSO4 : Dy was prepared from mixture of 10 g CaSO4.2H2O and 54.46 mg Dy2O3 to find 0.3 wt% of Dy and 99.7 wt % of CaSO4. The pellets are produced by pressing at 0.39 Pa, and sintering at temperatures between 800oC – 1000oC. The aim of this research is to investigate the influence of sintered temperature from 800oC to 1000oC on the contents and crystal structure of the samples. A good linear is shown at 900oC. The XRF analysis was done for powder and pellets with results are 63.94 wt% Ca, 35.55 wt% S, 0.50 wt% Dy and 59 – 61 wt% Ca, 35-40 wt% S, 0.3-0.5 wt% Dy respectively. The XRD spectrum reveals that crystal structure is orthorhombic with lattice parameters for CaSO4 phase are 6.988 A, 6.979 A and 6.229 A.

Advanced Materials Research, May 15, 2014