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All Journal Buletin Udayana Mengabdi Bumi Lestari Jurnal Sains Materi Indonesia Jurnal Neutrino : jurnal fisika dan aplikasinya Journal of Mathematical and Fundamental Sciences BULETIN FISIKA Kappa Journal Jurnal Fisika Indonesia
Ni Nyoman Rupiasih
Department Of Physics, Faculty Of Mathematics And Natural Sciences, University Of Udayana
Agriculture, Biological Sciences & Forestry Humanities Astronomy Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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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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Abstract

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
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.
PENGARUH TEMPERATUR LARUTAN TERHADAP KARAKTERISTIK RAPAT ARUS-BEDA POTENSIAL MEMBRAN KITOSAN Angelia Bella Kusumaningtyas; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 17 No 2 (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 about the characteristics of the diffusion current density-potential (J-V) of chitosan membrane has been done. It aims to determine the effect of concentration (C) and temperature (T) solution to J-V characteristic curve of the membrane. The membrane made of chitosan, as the base material (matrix) and 1% acetic acid as the solvent, with the composition of matrix/solvent of 2%. In the ion transport experiments, KCl electrolyte solution with various concentration of 0.1 mM, 1 mM, 10 mM, 100 mM, and 1000 mM and with variation of temperature of 300.9 to 340.9 K. The results showed that the value of the diffusion current density of ion sincreases with increasing the ratio of the concentration of solution in room 1 (C1) and room 2 (C2). The J-V curve shows non-linear relationship and it’s shifted toward larger potential with increased in temperature. These results indicate that the concentration gradient and temperature greatly affect the J-V characteristics of chitosan membrane.
Monitoring the Absorption Dose of X-ray Radiation on the Thoracic Examination I Made Hendra Hadinata; Ni Nyoman Rupiasih
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 study of monitoring the absorption dose of X-ray radiation received by thoracic examination patients has been conducted. The absorbance dose received by the patient is calculated from the exposure factor data consisting of electric voltage (kV), current (mA), time (s), and examination distance (m). Data were obtained from 130 male patients and 60 female patients, who performed thoracic examinations in a Posterior Anterior (PA) position. The absorbed dose received by male and female patients is compared with the maximum absorbed dose determined by BAPETEN for thoracic examinations on adult patients, which is 0.4 mGy. Differences in the absorbed dose received by male and female patients were identified by the T-test of two free samples with a significance level of 0.05. The results showed that the dose of X-ray radiation received by male and female patients was still below the maximum absorbed dose determined by BAPETEN, and the results of the T-test showed no significant difference in the absorbed dose received by male and female patients.
PENGARUH WAKTU PAPARAN RADIASI UV-C TERHADAP KARAKTERISTIK RAPAT ARUS DIFUSI ION PADA MEMBRAN KITOSAN Putu Ika Paramitha Putri; Made Sumadiyasa; Ni Nyoman Rupiasih
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

It has conducted research about the effects of UV-C irradiation to the current density of ion diffusion characteristics of chitosan membranes. A series of chitosan membranes with various ratios of components was used such as 1%, 2%, 3% and4%, the electrolyte solution was NaCl with various concentration of 0.1 mM , 1 mM, 10 mM, 100 mM, and 1000 mM, and time exposure of 5, 15, 30, and 60 minutes. Ion transport processes were carried out in a cell membrane model which composed of two compartments, and the potential difference was measured using a pair of Activon AEP calomel electrodes. All the measurements were conducted at room temperature of about 28.1oC. The result showed that the current density increased with increasing some parameters e.g. the ratio of concentration of solution in both compartments (C1/C2), the amount of chitosan (1%, 2%, 3% and4%), and exposure time.
The Design of a Homogeneous Magnetic Field Generator for Applications in Membrane Making Ida Ayu Putu Inten Gayatri; Ni Nyoman Rupiasih; Made Sumadiyasa
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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It has been designed a homogeneous magnetic field (B) generation system in a particular room. This is important to conduct research related to the effects of magnetic field exposure on chemical reactions, especially in the process of making membranes. The development was carried out using four Helmholtz coils which radius (R) of 15 cm and number of turn (N) of 130 turns, that connected in parallel and coaxial. The both coils were fixed at the same distance as the radius of the coil that intended to get a homogeneous magnetic field between the both coils. The design has been tested by measuring a magnetic field generated as function of a current (I) given. The results show that, for x is the distance from the midpoint of the both coils to a certain distance, the homogeneous magnetic field obtained in the region of -7 cm < x <+7 cm, the area between the both coils. The magnitude of the homogeneous magnetic field produced depends on the electric current given.
The Study of Current-Voltage (I-V) Characteristic Curve of Chitosan-Silver Nanoparticle Composite Membrane Maulida Nirwana Islami; Ni Nyoman Rupiasih; Made Sumadiyasa; I B Sujana Manuaba
BULETIN FISIKA Vol 19 No 2 (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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A study of the current-voltage (I-V) curve of the chitosan-silver nanoparticle composite membrane (Ch-AgNP) has been conducted. Membranes were prepared by casting method using chitosan as matrix, acetic acid 1% as solvent and silver nanoparticle (AgNP) as filler. AgNP used was 100 ?g. As a comparison is a pure chitosan membrane (membrane Ch). The I-V measurement was performed using a cell model consisting of 2 chambers, chambers 1 and 2. The voltage (V) was measured using Ag/AgCl calomel electrode in electrolyte solution of KCl and CaCl2 with concentration of 0.025 M. All measurements were done at room temperature ± 28 0C. The result shows that in the current range 0.66-0.98 mA, the I-V curve of the Ch-AgNP membrane is ohmic. The conduction value of the composite membrane is smaller than that of the chitosan membrane and the value is greater in the KCl solution than in CaCl2 solution.
RANCANG BANGUN KLINOSTAT 2-D DENGAN PEROTASI MOTOR DC D06D401E I Made Oka Guna Antara; I Wayan Supardi; Ni Nyoman Rupiasih
BULETIN FISIKA Vol 17 No 2 (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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It has successfully developed a 2-D clinostat using a DC motor rotation D06D401E. The tool has angular velocity (?') of 1.67 to 93.53 rpm with changes intervals of 1.67 rpm. The reading of angular velocity is performed by DI-REV#1 module, the reading of data by the ATmega16 microcontroller on timer/counter T1 PortB.1 and 2x16 LCD as a data display. The accuracy of the angular velocity which compared by a digital tachometer DT-2234C + (?'ref) is 99.91%. The input voltage to a DC motor supplied by a variable power supply with range of 0-5 VDC, with the linearity between power and angular velocity of 99.13%. At the smallest value of the angular speed of 1.67 rpm obtained a Relative Centrifugal Force (RCF) of 4.68´10-5 g.
Study on Transport Properties of Chitosan Membrane in Different Types of Electrolytes Ni Nyoman Rupiasih; Made Sumadiyasa; I Ketut Putra; Ni Made Rasmini
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 2 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2018.50.2.6

Abstract

In this study, the electrical properties of chitosan membrane in different types of electrolytes were investigated by analyzing the current-voltage (I"‘V) curve. The membrane used was chitosan membrane 2%. The different electrolyte solutions used were KCl, HCl, MgCl2, CaCl2 and AlCl3 at concentrations of 0.025 M. The I-V experiments were done using a two-compartment cell, which contained two working electrodes made of platinum connected to a DC current source and two Ag/AgCl reference electrodes connected to a voltmeter. All experiments were conducted at an ambient temperature of 28.7 °C. Water uptake (hydrophilicity) and Fourier transform infrared (FTIR) measurements were also studied in this research. The I-V curves show the ohmic behavior of the membrane. The resistance of the membrane was higher in the electrolyte solutions with larger Stokes radii and lower in the electrolyte solutions with larger diffusion coefficients, except in the HCl solution. These results indicate that the I-V curve shapes are affected by the type of electrolyte solution used for the chitosan membrane transport. The hydrophilicity of the membrane was improved after exposure to the electrolyte solutions. The FTIR analysis revealed a new peak at about 677 cm-1, which indicates the formation of C-Cl groups in the used membranes.
Pengaruh Mikrogravitasi Pada Biji Cabai Rawit yang Telah Terpapar Radiasi UVC Terhadap Laju Pertumbuhan Tanaman Cabai Rawit (Capsicum Frutescent L.) Ni Nyoman Rupiasih; Made Sumadiyasa; Ni Kadek Gita Hari Yanti
Jurnal Fisika Indonesia Vol 21, No 2 (2017)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.849 KB) | DOI: 10.22146/jfi.42199

Abstract

Telah dilakukan penelitian tentang pengaruh mikrogravitasi pada biji cabai rawit (Capsicum frutescent L.) yang telah terpapar radiasi UVC selama 1 jam terhadap laju pertumbuhan dan persentase hidup tanaman cabai. Lingkungan mikrogravitasi disimulasikan menggunakan klinostat 2-D dengan kecepatan rotasi 2,7 rpm. Biji terpapar radiasi UVC tersebut diberikan perlakuan mikrogravitasi selama 12 jam, 24 jam, dan 48 jam, yang secara berurutan disebut sampel S5, S6, dan S7. Sebagai pembanding adalah biji tanpa perlakuan (kontrol), biji dengan radiasi UVC selama 1 jam, biji dengan perlakuan mikrogravitasi selama 12 jam, 24 jam, dan 48 jam, yang secara berurutan disebut sampel S0, S1, S2, S3, dan S4. Semua kelompok sampel tersebut ditanam pada lingkungan gravitasi normal, 1 g. Penelitian ini dilakukan selama fase vegetatif (sampai umur tanaman 40 hari). Pengukuran tinggi tanaman dan jumlah tanaman hidup dilakukan setiap hari. Hasil penelitian menunjukkan bahwa perlakuan mikrogravitasi pada biji cabai yang terpapar radiasi UVC selama 1 jam memberikan pengaruh negatif atau positif terhadap laju pertumbuhan tanaman cabai rawit. Besar pengaruh bergantung pada lama perlakuan yang diberikan dan fase pertumbuhan tanaman. Pada persentase tanaman hidup, tidak terdapat perbedaan antara sampel kontrol dan sampel dengan perlakuan mikrogravitasi.
Co-Authors A. A. N. Surya Mahendra Putra A.A. Ngurah Gunawan Adnyana, I Gusti Agung Putra Anastasia Victor, Agnes Maria Salvi Angelia Bella Kusumaningtyas Decky Danuarta Fernanda Dewa Ayu Sukma Pranastia Dewa Ayu Sukma Pranastia Dewi Handayani Fahim Mamduh Gunawan, A. A. Ngurah Gusti Ngurah Sutapa Helena Idah Hery Suyanto I B Sujana Manuaba I G. A. Widagda I Gde Antha Kasmawan I Gusti Agung Ayu Ratnawati I Ketut Putra I Made Hendra Hadinata I Made Oka Guna Antara I Nengah Sandi I Nengah Sandi I Nengah Simpen I Wayan Supardi I Wayan Supardi I. W. Sumarjaya I.B.S. Manuaba I.W. Sumarjaya Ida Ayu Putu Inten Gayatri Ida Bagus Alit Paramarta Ida Bagus Made Suryatika Ida Wisnu Sari James Sibarani K N Suarbawa Komang Dharmawan Laura Laudensia Senly Jalut M. Joni Made Sumadiyasa Maria Yulni Imas Maulida Nirwana Islami Ni Kadek Gita Hari Yanti Ni Kadek Gita Hari Yanti Ni Luh Yuni Pramita Utami Ni Made Rasmini Ni Nyoman Putri Windari Ni Wayan Eri Sandriani Ni Wayan Eri Sandriani Nyoman Wendri Nyoman Wendri Nyoman Wndri P. B. Vidyasagar P. Suardana Pt Widyatmika Putu Erika Winasri Putu Ika Paramitha Putri R.A Restia Pranagari Ratih Wulandari Ria Yuliani Rosvita Hilbrida Sulastri S. S. Jagtap Septiana Ribka Purnomo Umi Hariyani Wolfharditia Oktaviana Nita Yan Ramona Yohanes Sardjono Yosefa Yakunda Tandu Zoucella Andre Afani