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All Journal Buletin Udayana Mengabdi Jurnal Ilmu Dasar Jurnal Sains Materi Indonesia Jurnal Neutrino Journal of Mathematical and Fundamental Sciences BULETIN FISIKA Kappa Journal Jurnal Fisika Indonesia
Made Sumadiyasa
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The effect of various disturbances on the seeds on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of cayenne pepper Seedlings Ni Nyoman Rupiasih; Ni Kadek Gita Hari Yanti; Made Sumadiyasa; I.B.S. Manuaba
BULETIN FISIKA Vol 19 No 1 (2018): 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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Study on the effect of various disturbances on the cayenne pepper seeds (Capsicum Frutescens L.) to the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants in the germination period have been done. The disturbances given include UV-C irradiation for 1 hour (S1), microgravity for 12 hours (S2), for 24 hours (S3), and for 48 hours (S4), as well as combined disturbances that are UV-C irradiation for 1 hour followed by microgravity for 12 hours (S5), for 24 hours (S6), and for 48 hours (S7). As comparison, it has been used seeds without treatment called control (S0). The microgravity environment was created using a 2-D clinostat with a rotational speed of 2.7 rpm (1.2 x 10-4 g). All samples were grown in normal gravity (1 g) environment. Observations were made during the vegetative phase until the plant was 40 days old. Measurements of chlorophyll a, chlorophyll b, carotenoids, and biomass were performed at the plants were 10, 20, and 40 days old. The results showed that disturbances which given on the seeds gave positive effects on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants. The impacts depend on the duration of the disturbances given.
STUDI MEMBRAN KITOSAN DARI KULIT LOBSTER BAMBU SEBAGAI MEMBRAN FILTRASI Ni Nyoman Putri Windari; Ni Nyoman Rupiasih; Made Sumadiyasa
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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The study of the extraction and characterization of chitosan from skin waste of Bamboo Lobster (Panulirus versicolor) has been done. Chitosan is extracted using conventional method, namely the initial process: cleaning and drying (pretreatment), demineralization, deproteination, and deacetylation. The chitosan obtained has been used to prepare chitosan membrane 2% with acetic acid 1% as solvent. The membrane prepared by phase inversion method withprecipitation through solvent evaporation. The prepared membranes were characterized by FTIR spectrophotometer, Nova 1200e by BJH method and filtration method. The results obtained that degree of deacetylation (DD) of chitosan is 70.016%. The thickness of the membrane is 0.361 mm. The FTIR spectra show that functional groups obtained are -NH, -CH, C=O, C-O and -CN. From BJH method obtained that the pore radius is 1.69 nm and pore density is 8.95 x 105pores/m3. From the filtration method obtained that at each pressure, 80-85 kPa and 90-100 kPa, the PWF values are 381.232 and 454.545 L/m2.h, respectively.
EFEK LAMA PAPARAN RADIASI UV-C TERHADAP KARAKTERISTIK I-V MEMBRAN KITOSAN Putu Erika Winasri; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 15 No 1 (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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An investigation of the effects of UV exposure particularly UV-C to the characteristics of the currentvoltage(I-V) of chitosan membrane 2% has been done. The electrolyte solution was NaCl withvarious concentration of 0.1 mM and 10 mM, time exposure 10, 20, 40 and 60 minutes, and theincreasing currents from 19 -24 ?A with increment of 0.5 ?A. Transport process is done by using amodel cell membrane consist of 2 chambers. The voltage difference of membrane is measured using acalomel electrode. In this study, chitosan membranes were exposure to UV radiation for 0-60 minutes.The I-V characterization is done by the current clamp method. The solution used is NaCl solution withthe concentration ratio of the both chambers (C1:C2) was 0.1 mM : 0.1 mM and the given currentswere from 19 -24 ?A with increment of 0.5 ?A. From the observations obtained, the I-V characteristicgraphs showed Ohmic's region, it has not showed limiting current density and overlimiting currentregion. The I-V characteristic graphs also shows that ion transport in NaCl solution (voltage can bemeasured) in the chitosan membrane system occurred at a certain current value. The increased oftime exposures resulted in a decrease of conductance of chitosan membrane to ions in NaCl solution.
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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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.
DTA-TG Analysis of Gd0.95La0.05Ba1.95Sr0.05Cu3Oy Compounds Made Sumadiyasa; I Putu Suardana; Nyoman Wendri
BULETIN FISIKA Vol 21 No 1 (2020): 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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The sintering temperature is played a vital role in the evolution of phase structure, microstructure, and the properties of the superconductor. In this study, the Gd0.9La0.1Ba1.95Sr0.05Cu3O7-d phase compound has been synthesized by the wet method using HNO3 as a solvent. The samples were divided into two groups. The first sample was calcined at 400 °C for 2 hours + 500 °C for 2 hours + 600 °C for 6 hours. The second sample treated by the same process and then continued by heating at 900 °C for 15 minutes. The effect of the calcination temperature for the synthesis of Gd0.9La0.1Ba1.95Sr0.05Cu3O7-d bulks was investigated using the DTA-TG method. The results showed that the optimum reaction temperature for the formation of Gd0.9La0.1Ba1.95Sr0.05Cu3O7-d phase was 938 °C. The additional heating temperature e.g. 900 °C for 15 minutes on the calcination process can reduce the optimum formation temperature of Gd0.9La0.1Ba1.95Sr0.05Cu3O7-d compounds by 20 °C. The peritectic melting reaction temperatures of the sample without the addition of heating and with the addition of heating at temperature 900 °C for 15 minutes are 1032°C and 1035°C, respectively. The melting temperatures of both samples are 1164 °C and 1200 °C.
STUDI SINTESIS NANOPARTIKEL PERAK DENGAN METODE BIOLOGI MENGGUNAKAN TANAMAN SAMBILOTO (Andrographis paniculata Ness) Septiana Ribka Purnomo; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 18 No 1 (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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This study is report about the synthesis of silver nanoparticles (AgNP) using biological method (biosynthesis) using sambiloto plant extracts (Andrographis paniculata Ness). Plant part used is the leaves and extract process is done with demineralized water (aqua-dm). The synthesis is done at a ratio of AgNO3 solution with sambiloto extract solution is 10 µl : 10 ml. Characterization techniques that have been made include UV-Vis spectrophotometer, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results showed that silver nanoparticles formed has absorbance of SPR (surface plasmon resonance) peak at a wavelength of about 423 nm. XRD characterization of the structure obtained FCC (face center cubic) with a lattice parameter is 4.031 Å, diffraction peaks at 2q = 38,18o, 45,81o and 64,87o each corresponding to the (h k l) of (1 1 1), (2 0 0) and (2 2 0) respectively. TEM characterization obtained that the particle size distribution is 10 – 30 nm.
PENGARUH PENAMBAHAN ND PADA PEMBENTUKAN FASE BI-2212 : (Bi1.63Pb0.37) Sr1.6Ca2.25Cu3.15Oy + Ndx P. Suardana; I G A. Putra Adnyana; M. Sumadiyasa
BULETIN FISIKA Vol 13 No 2 (2012): 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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Has conducted research related to the addition of Nd on formation 2212 phase of superconductor system BPSCCO : (Bi1.63Pb0.37) Sr1.6Ca2.25Cu3.15Oy + Ndx. The samples prepared by solid state reaction method with sintering temperature of 830 oC for 27 hours. XRD measurements revealed that the samples have shown the formation (Bi, Pb)-2212 phase with a good crystalinity (FWHM < 0.250). Provided that the volume fraction of (Bi, Pb)-2212 phase formed increases with increasing of addition of Nd. The highest volume fraction of 94.11% was obtained on the sample with the fraction of x = 0.050. The measurements of resistivity as a function of temperature with 4-point electrode method revealed that the samples have not shown the Tco, but it have shown Tcon-set ~ 81K. The addition of Nd does not have a significant influence on the Tcon-set.
The Conductance and Swelling of Composite Membrane ‘Chitosan-Silver Nanoparticles’ in Monovalent Salt Solution ‘KCl and NaCl’ Ni Wayan Eri Sandriani; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 20 No 2 (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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A research about to determine the conductance and water absorption capacity (swelling) of the composite membrane has been conducted. The membrane used was a membrane made of chitosan matrix, silver nanoparticle(AgNP) of 100 µg as a filler and acetic acid 1% as a solvent, which named chitosan composite membrane (Ch-AgNP). A 2% chitosan membrane (membrane Ch) used as a comparison. The membrane conductance value determined by measuring the membrane voltage (V) as a function of current (I) in monovalent salt solutions of NaCl and KCl with a concentration of 0.025 M. The swelling tests have been carried out using distilled water. The results showed that Ch membrane conductance was greater than the Ch-AgNP composite membrane. In KCl solution, the conductance is 0.0991 ?-1 and 0.0984 ?-1 and in NaCl solution are 0.1002 ?-1 and 0.0996 ?-1. The membrane conductance is greater in NaCl solution than in KCl solution. The swelling test showed that the swelling percentage of Ch-AgNP composite membrane was greater than Ch membrane
Effect of Sintering Temperature on Formation of Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d Compounds Asni Mulyati Jeni; Made Sumadiyasa; Ida Bagus Made Suryatika
BULETIN FISIKA Vol 24 No 1 (2023): BULETIN FISIKA February Edition
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.2023.v24.i01.p02

Abstract

Research has been conducted variations in sintering temperature between 900 ºC – 950 ºC for 12 hours on the synthesis phase of Gd1Ba2Cu3O7-d substituted La and Sr with stoichiometric composition Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d. This study is intended to find out at what temperature the compound Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d can be formed to the maximum. Samples with composition Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d made from the raw materials Gd2O3, La2O3, BaO, Sr2O3 and CuO. Samples are synthesized using solid-state reaction method by wet mixing with nitric acid (HNO3) as solvent. The sample is sintering in the form of pellets in the furnace without annealing of oxygen gas. The synthesis results were characterized by X-Ray Diffraction (XRD) and analyzed with the Match-3 Program. By using the Entry number 96-153-9606, the results of it analysis showed that sintering temperature had an impact on the formation of phase compounds Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Show that the volume fraction is increases with increasing of the sintering temperature, especially from temperatures of 930 ºC to 950 ºC. The highest volume fraction of 75.43% was obtained in samples that sintering at 950 ºC. Refinement results with Rietveld analysis method showed phase Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d formed is in orthorhombic symmetry. The volume of cell units is likely to increase as the temperature increases. Abstrak Telah dilakukan penelitian variasi suhu sintering antara 900 ºC - 950 ºC selama 12 jam pada sintesis fase Gd1Ba2Cu3O7-d tersubstitusi La dan Sr dengan komposisi stoikiometri Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Penelitian ini bertujuan untuk mengetahui pada suhu berapa senyawa Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d dapat terbentuk secara maksimal. Sampel dengan komposisi Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d dibuat dari bahan awal Gd2O3, La2O3, BaO, Sr2O3 dan CuO. Sampel disintesis dengan menggunakan metode reaksi padatan (solid-state reaction) dengan pencampuran basah (wet-mixing) dengan asam nitrat (HNO3) sebagai pelarut. Sampel disintering dalam bentuk pelet di dalam tungku tanpa pemberian annealing gas oksigen. Sampel hasil sintesis dikarakterisasi dengan X-Ray Difraction (XRD) dan dianalisis dengan Program Match-3. Dengan menggunakan referensi Entry number 96-153-9606, hasil analisisnya menunjukkan bahwa suhu sintering adalah berdampak terhadap pembentukan senyawa fase Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Memperlihatkan bahwa fraksi volume bertambah seiring dengan bertambahnya suhu sintering, terutama pada suhu 930 °C sampai dengan 950 °C. Fraksi volume tertinggi sebesar 75,43 % didapat pada sampel yang disintering pada suhu 950 °C. Hasil refinemen dengan metode analisis Rietveld menunjukkan fase Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d yang terbentuk adalah dalam simetri ortorombik. Volume unit sel adalah cenderung meningkat seiring bertambahnya suhu sintering.
The The Effect of UVC Irradiation on the Structure and Swelling Properties of Chitosan Membranes Exposed to Magnetic Fields Ida Wisnu Sari; Wolfharditia Oktaviana Nita; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 20 No 2 (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 – Research on the effect of UVC radiation exposure on the structure and swelling properties of chitosan membranes exposed to magnetic fields has been carried out. The membrane used is the 2% chitosan membrane that has been exposed to a magnetic field of 1.5 mT in a parallel direction for 2 hours at the time of its formation (formation reaction). Furthermore, the dry membrane obtained was cut to a certain size and irradiated by using UVC radiation for 5, 10, 15 and 30 minutes, each of which was given the names M1, M2, M3 and M4. A comparison is a 2% chitosan membrane with exposure to a magnetic field for 2 hours without exposure to UVC radiation, which is called the control membrane (M0). Characterizations conducted include thickness, swelling (water absorption) and FTIR spectrophotometer. FTIR analysis shows that the OH, NH, CH, C = O, CN, CO and COC functional groups observed on the M0 membrane as well as on the M1, M2, M3, and M4 membranes, with the peaks shifted to smaller or larger wavenumbers. The percentage of transmittance of these functional groups increases with increasing irradiation time from 5 to 15 minutes and decreases in 30 minutes irradiation.
Co-Authors A. A. Ngr. Gunawan A. A. Ngurah Gunawan Angelia Bella Kusumaningtyas Asni Mulyati Jeni Dewa Ayu Sukma Pranastia G. Agus Permana Putra Sujana Hanan Hanan Hery Suyanto I B Sujana Manuaba I G A. Putra Adnyana I Gede Astina I Gusti Agung Ayu Ratnawati I Ketut Putra I Komang Wahyu Surya Permana I Nengah Artawan I.B.S. Manuaba Ida Ayu Putu Inten Gayatri Ida Bagus Made Suryatika Ida Wisnu Sari IGA Putra Adnyana Isnaeni Isnaeni K. N. Suarbawa Maulida Nirwana Islami Ni Kadek Gita Hari Yanti Ni Kadek Gita Hari Yanti Ni Made Rasmini Ni Nyoman Putri Windari Ni Nyoman Rupiasih Ni Wayan Eri Sandriani Nyoman Wendri Nyoman Wndri P. B. Vidyasagar P. Suardana Putra Adnyana, IGA Putu Erika Winasri Putu Ika Paramitha Putri Septiana Ribka Purnomo Wayan Gede Suharta Windarjoto Windarjoto Wolfharditia Oktaviana Nita