Suharta, I Wayan Gede
Departement Of Physics, Faculty Of Mathematics And Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

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PEMANFAATAN KOTORAN SAPI SEBAGAI BAHAN BIOGAS SKALA RUMAH TANGGA ANGGOTA SUBAK BANYUMATI DESA UMA ANYAR SERIRIT BULELENG P. Suardana; M. Sumadiyasa; W. G. Suharta; A. A. Ngr. Gunawan; K. N. Suarbawa
Buletin Udayana Mengabdi Vol 16 No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

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Abstract

Telah dilakukan sosialisasi kepada anggota masyarakat Subak Banyumati Desa Uma Anyar mengenai dampak yang diakibatkan oleh polusi gas metana yang dihasilkan dari kotoran sapi dan telah melakukan usaha pemberdayaan anggota masyarakat Subak Banyumati untuk mengembangkan sistim pertanian terintegrasi antara pertanian, peternakan, dan pemanfaatan teknologi untuk meningkatkan nilai tambah kotoran sapi melalui pelatihan “Pemanfaatan Kotoran Sapi Sebagai Bahan Biogas Skala Rumah Tangga”. Dengan terlaksananya program pengabdian masyarakat ini anggota masyarakat Subak Banyumati mampu membuat instalasi biogas skala rumah tangga hingga menghasilkan gas metana dan mengoprasikannya untuk memasak. Dengan demikian masyarakat Desa Ume Anyar pada umumnya dan anggota masyrakat Subak Banyumati pada khususnya mampu memanfaatkan kotoran sapi sebagai bahan biogas dan mampu membuat pupuk kompos dalam waktu yang lebih cepat dari sebelumnya, serta yang tidak kalah pentingnya adalah masyarakat berkontribusi mengurangi polusi udara oleh gas metana.
Pengaruh Subtitusi Unsur Nd dan Eu Pada Struktur Kristal Superkonduktor Y-124 (Y1-x-yNdxEuyBa2Cu4O8??) Laura Laudensia Senly Jalut; Wayan Gede Suharta; Windaryoto Windaryoto
BULETIN FISIKA Vol 23 No 2 (2022): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i02.p06

Abstract

In this study, the substitution of elements Nd and Eu on the superconductor Y1-x-yNdxEuyBa2Cu4O8?? (Y-124) has been carried out using compounds Y2O3, BaCO3, CuO, Nd2O3 and Eu2O3 with molar variations of Nd (x) and Eu (y), respectively. 0, 0,05, 0,1, 0,15 and 0,2 respectively to determine the effect of Nd and Eu substitution on the volume fraction and crystal structure of the superconducting Y-124. Samples were synthesized using wet mixing method with HNO3 as solvent, followed by calcination process at 600 oC for 3 hours and sintering process at 900 oC for 10 hours. Analysis of the structure of the superconducting Y-124 was carried out by characterizing X-ray Diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR). The results of XRD characterization showed a fine and sharp spectrum which indicated that crystallization had occurred completely. The resulting spectrum was dominated by the Y-124 phase and a small percentage of the impurities were detected. Substitution of Nd and Eu elements resulted in volume fractions of 82,7 %, 83,6 %, 84,4 %, 87,0 % and 85,9 %, respectively. The volume fraction value increased with the addition of Nd and Eu from 0 to 0,15, then decreased at 0,2. This indicates that the optimization of the addition of Nd and Eu is at a value of 0,15 in the molar ratio of compounds. The substitution of Nd and Eu elements also causes changes in the lattice parameters towards the a-axis with values between 3,7549 and 3,8323 , towards the b-axis with values between 3,8094 and 3,8425 , and towards the c-axis with values between 26,7390 and 26,8970. The FTIR results show the presence of an absorption band in the YBCO region, but the sample still contains impurities which are indicated to come from BaCO3 and HNO3.
Effect of Silver (Ag) Addition on the Forming Of Y-247 Superconductors (Y2Ba4Cu7O15-?) using Wet Mixing Method A.A. Made Wisnu Wijaya Putra; W. G. Suharta; P. Suardana
BULETIN FISIKA Vol 20 No 1 (2019): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

Superconductor Y-247 (Y2Ba4Cu7O15-?) with adding silver (Ag) by using the wet-mixing method has been done. The synthesis process was carried out by calcination at 600o C for 3 hours and sintered at 925o C for 10 hours. Variations in the increase in the addition of Ag used were Ag0.05, Ag0.1, Ag0.15 and Ag0.2. Characterization of X-Ray Diffraction (XRD), showed an increase in the addition of Ag resulting in a decrease in the volume fraction, where the volume fractions obtained consecutive were 55.0%, 51.3%, 50.9% and 46.3%. Increasing the addition of Ag results in an increase in the lattice parameter values in the direction of the a axis which is 3.8247 Å, 3.8291 Å, 3.8292 Å, 3.8293 Å, decreasing the lattice parameter values in the b axis direction which is 3.8426 Å, 3.8415 Å, 3.8409 Å, 3.8383 Å and decreasing the lattice parameter values in the direction of the c axis are 49.2174 Å, 49.2022 Å, 49.1881 Å, 49.1761 Å. Analysis of the results of the characterization of Scanning Electron Microscopy (SEM), the particle size obtained was 225.47 nm, 202.88 nm, 190.68 nm and 172.22 nm.
Pemodelan Citra Akuifer Menggunakan Metode Geolistrik Jeris Habfrons Wiatri Djereng; I Nengah Simpen; I Wayan Gede Suharta
BULETIN FISIKA Vol 18 No 2 (2017): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

Has been done research on modeling the image of the aquifer using geoelectric method. This research was conducted on 7 conditions by taking one data at each condition there is condition without being given a model, model conditions flats have not given water and by water, aquifer conditions concave not given water and by water, and aquifer conditions veined not given water and by water this so can get to see the image data inversion results of resistivity using Res2dinv. Modeling the aquifer flat using geoelectric method obtained the image in the form of layers of images with different colors in which this is due to the material composition and water content are different. Modeling the concave aquifer using geoelectric obtained the aquifer at a depth of 15-30 cm with blue color because in this area the water content is more than other areas. Modeling a branched aquifer using geoelectric method obtained the image in the form of two points aquifer detached in blue, this is two water sources. In the image modeling of aquifers using geoelectric method the resistivity value lower aquifer region compared to other regions as indicated by the color of light blue until dark.
KARAKTERISASI SUHU PEMANASAN SERBUK ZEOLIT UNTUK MENGIMOBILISASI UNSUR PB DALAM LARUTAN DENGAN ANALISIS MENGGUNAKAN LASER INDUCED BREAKDOWN SPECTROSCOPY (LIBS) Aji Priyo Utomo; Hery Suyanto; Wayan Gede Suharta
BULETIN FISIKA Vol 17 No 1 (2016): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

A research on the characterization of the heating temperature of the zeolite powder to immobilize Pb element in the solution by using LIBS analysis. This research aims to determine the optimum condition to heated zeolite powder in tho KBr substrate. Zeolite powder have to be to activated with the NaOH 1 M. After been the activation, that powder has been solited in tho Pb solution 1000 ppm and heating until the solution was used up so left the zeolite powder with the Pb element. Then, the powder patched on the KBr and pressed in the pressure 400 kPa so became the pellet. The pellet heated in tho temperature 25oC, 40 oC, 60 oC and 80 oC. After analyzed using LIBS, obtained the optimum temperature to heating the sampel is 60 oC.
PENGARUH VARIASI TEMPERATUR SINTERING TERHADAP STRUKTUR KRISTAL SUPERKONDUKTOR Y0.5La0.5Ba2Cu3O7-? I G. Cahya Pradhana; Wayan Gede Suharta; I Gusti Agung Widagda
BULETIN FISIKA Vol 17 No 1 (2016): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

Variation of sintering temperature have been done in the synthesis superconductors using wet-mixing method by adding to obtain homogenous superconductors. Generally, XRD characterization and search match indicates the presence impurities of BaCO3, BaCuO2, dan CuO compounds. Variation of sintering temperature of 750oC, 850oC, dan 950oC showed an increase in the volume fraction of superconductors of 57.15%, 88.78%, and 95.04%, lattice parameter a showed a decreased of 3.891178 ?, 3.886266 ?, and 3.879036 ?, b of 3.912534 ?, 3.910184 ?and 3.897226 ?. Meanwhile, lattice parameter c showed an increased of 11.600093 ?, 11.769890 ?, and 11.826884 ?, crystal size of 73 nm, 149 nm, and 160 nm.
SINTESIS FASE Nd1Ba2Cu3O7-d DENGAN Ba(OH)2.8H2O SEBAGAI PENGGANTI Ba2CO3 DENGAN METODA REAKSI PADATAN DENGAN MEDIA PENCAMPUR ALKOHOL I Gede Astina; M. Sumadiyasa; I N. Artawan; W. G. Suharta
BULETIN FISIKA Vol 15 No 2 (2014): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

The phase of Nd1Ba2Cu3O7-? has been synthesized by replacing Ba2CO3 to Ba(OH)2.8H2O. Thesynthesis has been done by solid reaction method in air atmosphere without annealing. The sampleswere mixed with alcohol partially and otherwise. The characterization using x-ray radiation (XRD), thatthe samples have shown the diffraction pattern appropriated to the pattern of diffraction of theNd1Ba2Cu3O7 phase with the volume fraction greater than 93% are resulted. The refinement with thesoftware Rietica procedure shown the Nd1Ba2Cu3O7 phase in symmetry orthorombyc form and the valueof c2 is less than 1.8 only on the Ba(OH)2.8H2O sample through the calcination process are produced.The superconductivity at temperatures >77K through the Meissner effect characterization andmeasurements of resistivity as in the temperature function on the sample are not arose. Since therequired oxygen content not enough to the formation of Nd1Ba2Cu3O7 phase in high-Tc. This is shown bythe crystal structure of the Nd1Ba2Cu3O7 phase in the symmetry orthorombic-II and thetragonal areformed.