Comparison of nickel Ni0.6Co0.4Fe2O4 and NiFe2O4 were studied. The co-precipitation method was performed for the whole sample. After annealing of 600°C for 4 hours, the nanoparticles samples evaluated their structural properties by... more
Comparison of nickel Ni0.6Co0.4Fe2O4 and NiFe2O4 were studied. The co-precipitation method was performed for the whole sample. After annealing of 600°C for 4 hours, the nanoparticles samples evaluated their structural properties by using Fourier Transform Infra-Red (FTIR) and X-Ray Diffraction (XRD). The XRD pattern confirms that the whole samples have the crystalline structure of the face-centered cubic (fcc) inverse spinel. Furthermore, the lattice and crystallite size of NiFe2O4 increased when added Co2+. The FTIR spectrum showed two prominent absorption bands, i.e., at around k of 358 cm-1 and 588 cm-1, where metals at tetrahedral and octahedral sites reflect intrinsic vibrations, respectively. Finally, the decrease of saturated magnetization MS from 22.2 emu/g and 9.92 emu/g replacement of Co2+ cation with Ni2+.
Abstract: This study was to determine the effect of variations in the type and thickness of the filter on the ESE and HVL values. The use of filters aims to eliminate low energy X-rays, increase effective energy, and reduce dose... more
Abstract: This study was to determine the effect of variations in the type and thickness of the filter on the ESE and HVL values. The use of filters aims to eliminate low energy X-rays, increase effective energy, and reduce dose acceptance to patients. This variation of Al with Cu and Al with Zn filters uses a voltage (70, 80, and 90) kV, 20 mAs, 100 cm SSD, and an irradiation field area of 10 cm x 10 cm. The result of measuring the consistency of the X-ray tube voltage has the largest error value of 4.93%. At a voltage of 90 kV, the measurement results of the variation of Al filter with Cu thickness of 0.2 mm and 0.3 mm and Al filter with Zn thickness of 0.25 mm and 0.50 mm are within the tolerance limits of the thorax examination organ. While the measurement results of the Al filter variants with a Cu thickness of 0.4 mm and an Al filter with a Zn thickness of 0.75 mm are within the tolerance limit of the cranium examination organ. The ESE half value can use 3.03 mm Al, equivalent...
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Research has been carried out to determine the kVp of X-ray aircraft using an imaging plate (IP) as a measuring tool. The imaging plate functions to record images after irradiation and as a detector to capture and store X-ray energy when... more
Research has been carried out to determine the kVp of X-ray aircraft using an imaging plate (IP) as a measuring tool. The imaging plate functions to record images after irradiation and as a detector to capture and store X-ray energy when it penetrates an object. The purpose of this study is to use IP as a kVp measurement tool. The method used is to create a characteristic curve of the relationship between the ratio of Region of Interest (ROI) of two aluminum filters to rated voltage (kVp). From the research obtained the equation y = 2816.61 x2 – 4532.19 x + 1878.65 with R2 = 0.988. The kVp test was carried out using a fluoroscopic X-ray model SM-20HFH. The test results obtained that the measured kVp value at a voltage of 70 kV was 66.21 kV and an error value of 5.41%. While the measured kVp value at 55 kV is 58.95 kV with an error value of -7.18%. These results indicate that IP can be used to measure kVp with an error below the allowable tolerance, namely the max error ≤ of 10%.
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The magneto-impedance of the NiFe thin films is experimentally dependent on their structure. The multilayer structures of [NiFe/Cu] 4 and [NiFe/Cu] 2 /Cu/[NiFe/Cu] 2 on the meander structure PCB Cu substrate in this study were deposited... more
The magneto-impedance of the NiFe thin films is experimentally dependent on their structure. The multilayer structures of [NiFe/Cu] 4 and [NiFe/Cu] 2 /Cu/[NiFe/Cu] 2 on the meander structure PCB Cu substrate in this study were deposited using the electrodeposition method. The frequency was varied in order to determine its effect on the magneto-impedance ratio. The results of the magneto-impedance characterization measurement showed that the maximum MI ratio in the multilayer [NiFe/Cu] 4 structure was 6.82% while in [NiFe/Cu] 2 /Cu/[NiFe/Cu] 2 was 3.08% with a frequency of 100 kHz. The increase in the MI ratio in the low frequency range indicates that the MI ratio depends on the structure of the layer which is affected by the permeability of the magnetic material.
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The crystalline structure and magnetic properties of Mn 1-x Co x Fe 2 O 4 (x = 0 & 0.25) was studied in this report. The ferrite materials were synthesized by the chemical co-precipitation method and calcinated at 1000 o C for 5 hours.... more
The crystalline structure and magnetic properties of Mn 1-x Co x Fe 2 O 4 (x = 0 & 0.25) was studied in this report. The ferrite materials were synthesized by the chemical co-precipitation method and calcinated at 1000 o C for 5 hours. The obtained materials were characterized by FTIR, XRD and VSM, and for photocatalytic activity was measured by UV-Vis spectrometer. Vibration bands at tetrahedral and octahedral site were corresponded by = 581.56 cm -1 and = 465.83 cm -1 and 474.51 cm -1 . The obtained ferrite were confirmed by XRD as spinel structure and shown that the addition of number of Mn decreased crystallite size (D) and x-ray density ( ρ x ), but lattice constants (a) increased. The crystallite size of samples with x = 0.50 was 34.85 nm, and x = 0.75 was 32.17 nm. The magnetic properties of nanoparticles shown that magnetization saturation ( Ms) from 42.05 emu/g to 54.16 emu/g increased with the addition of number of Mn. The coercive field ( H c )decreased from 408.27 Oe to...
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The phenomenon of magnetoimpedance in the multilayer configuration of [Ni80Fe20/Cu]x/Cu/[Ni80Fe20/Cu]6-x with x = 1, 2, and 3 has been successfully investigated. The electrodeposition method used for the multilayer film preparation on the... more
The phenomenon of magnetoimpedance in the multilayer configuration of [Ni80Fe20/Cu]x/Cu/[Ni80Fe20/Cu]6-x with x = 1, 2, and 3 has been successfully investigated. The electrodeposition method used for the multilayer film preparation on the meander pattered of Cu PCB. The obtained multilayer samples were evaluated the MI effect at room temperature with a frequency of 100 kHz. Here, the MI effects were evaluated for a variation of the AC driving current i.e. IAC = 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA. The MI measurement results show that the multilayer x = 3 has the largest MI ratio and the multilayer with x = 1 was the smallest one. It is indicated that interlayer coupling contributes to the MI effect. Whereas the skin depth also confirms to contribute the MI ratio that showed the MI ratio increase with the increase of the IAC.
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INITIATING ENTREPRENEURIAL SKILLS THROUGH THE INTRODUCTION OF E-COMMERCE FOR ORPHANS OF THE MUHAMMADIYAH ORPHANAGE IN BLIMBING SUKOHARJO. Efforts to improve skills and the cultivation of entrepreneurial spirit have been carried out at the... more
INITIATING ENTREPRENEURIAL SKILLS THROUGH THE INTRODUCTION OF E-COMMERCE FOR ORPHANS OF THE MUHAMMADIYAH ORPHANAGE IN BLIMBING SUKOHARJO. Efforts to improve skills and the cultivation of entrepreneurial spirit have been carried out at the Orphanage PKU Muhammadiyah Cabang Blimbing. This institution is home to 20 orphans located in Wonorejo, Polokarto, Sukoharjo. Wonorejo village is a convection village where most of the population work as convection producers, which in the sale of their clothes still use conventional methods, which are sold in stores and in markets. The pattern of mutually beneficial cooperation between convection entrepreneurs and orphans is initiated by technopreneurship activities namely by selling convection through online stores.
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Evaluasi limit stochastik untuk thermally assisted magnetization reversal (TAMR) dibahas pada paper ini. Simulasi ini dilakukan dengan menyelesaikan persamaan Landau-Liftshitz-Gilbert (LLG) dengan asumsi nanopartikel CoPtCr magnetik... more
Evaluasi limit stochastik untuk thermally assisted magnetization reversal (TAMR) dibahas pada paper ini. Simulasi ini dilakukan dengan menyelesaikan persamaan Landau-Liftshitz-Gilbert (LLG) dengan asumsi nanopartikel CoPtCr magnetik dengan anisotropi tegaklurus sebagai storage cell memory. Magnetisasi mulai searah dengan medan eksternal sebesar H = 2,0 kOe, saat temperatur penulisan sebesar TW = 95,2%TC dan meningkat terus hingga hingga 85% saat TW = 97,86%TC. Sehingga keadaan ini (TW = 97.86%TC) dianggap sebagai batas limit stochastik untuk TAMR pada penelitian ini. Akhirnya, peningkatan temperatur penulisan 99,97%TC hanya menaikkan prosentase MX searah medan eksternal H sebesar 10%. Abstract Evaluation of stochastic limit for thermally assisted magnetization reversal (TAMR) discussed in this paper. This simulation is done by solving the equation Landau-Liftshitz-Gilbert (LLG) assuming nanoparticles CoPtCr perpendicular magnetic anisotropy as a memory cell storage. The magnetization direction aligning along to the external field direction of H = 2.0 kOe started when the writing temperature TW is 95.2%TC and increased steadily up to 85% when TW = 97.86% of TC. So that this condition (TW = 97.86% of TC) is regarded as the limit of stochastic for TAMR in this study. Finally, the writing temperature increase of 99.97%TC only raise thepercentage of MX in the direction of the external field H by 10%.
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Surface morphology of Fe(III)–porphyrin thin layers was studied using atomic force microscopy. The thin layer samples used in these experiments were deposited by spin coating methods on indium–tin-oxide substrates at room temperature... more
Surface morphology of Fe(III)–porphyrin thin layers was studied using atomic force microscopy. The thin layer samples used in these experiments were deposited by spin coating methods on indium–tin-oxide substrates at room temperature under atmospheric conditions. Variations of thin layer of Fe(III)-porphyrin were done by modifying the rotational speed and the concentration of the solution. The experimental results demonstrated that the Fe(III)–porphyrin layers were observed as discrete nanomolecular islands. Both the number of nano-islands and thickness of the layer increased significantly with increasing concentration. A layer thickness of 15 nm was obtained for low concentrations of 0.00153 M and become 25 nm for dense concentrations of 0.153 M. Conversely, the higher number of islands were deposited on the surface of the substrate at a lower rotational speed.