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All Journal Buletin Udayana Mengabdi Jurnal Biologi Udayana BULETIN FISIKA Jurnal Teknologi Informasi dan Komputer Indonesian Physical Review Kappa Journal
Ni Nyoman, Ratini
Program Studi Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Udayana
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Analisis Korosifitas Baja Ringan dengan Metoda Laser Induced Breakdown Spectroscopy (LIBS) Siti Raudatul Jannah; Ni Nyoman Ratini; Windarjoto Windarjoto; Hery Suyanto
Kappa Journal Vol 5, No 1 (2021): Juni
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v5i1.3446

Abstract

Method has been carried out. Research is done on mild steel zincalume type with immersion treatment (NaCl 3.5%) for 10 days, and 30 days and without immersion. Mild steel is laser irradiated (Nd-YAG 1064 nm, 7 ns) with energy of 120 mJ, and the data is taken with an accumulation of 3, delay time of 0.5 µs. Elements identification is done by taking data from up to 75 μm from the surface. The results of the analysis with LIBS showed immersion for 10 days, the corrosion rate and hardness of mild steel increased with 30 days immersion. The increase in the corrosion rate of mild steel is indicated by decreasing the value of dissolved oxygen intensity, the electrochemical reaction is fast. The decrease in the corrosion rate is indicated by the increase in the intensity value of Zn and Al elements associated with the formation of a passive film on the metal surface as a protective layer to protect further corrosion attacks.DOI : 10.29408/kpj.v5i1.3446
INTENSIFIKASI LAHAN PERTANIAN MENGGUNAKAN AIR BAWAH TANAH (RENCANA PROYEK PERCONTOHAN DI SUBAK SAYEHAN JASRI KARANGASEM I N. Simpen; N. N. Ratini; I M. S. Wibawa; I. B. M. Suryatika
Buletin Udayana Mengabdi Vol 16 No 2 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

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Abstract

Salah satu cara yang dapat dilakukan dalam usaha intensifikasi lahan pertanian adalah mengairi sawah dengan air bawah tanah pada musim kemarau atau pada saat air sungai sudah tidak ada. Di Subak Sayehan Jasri Karangasem hendak melakukan proyek percontohan intensifikasi lahan pertanian menggunakan air bawah tanah. Tujuan dari kegiatan pengabdian kepada masyarakat ini adalah menentukan titik pengeboran untuk mendapatkan air bawah tanah yang paling efektif. Titik pengeboran dicari dengan metode geolistrik. Hasilnya telah didapatkan titik pengeboran, pada jarak 115-126 m dari pinggir jalan, diperkirakan kedalaman 13 m sudah ditemukan air, pengeboran direkomendasikan sampai kedalaman 25 m.
PENGELOLAAN LABORATORIUM DAN PENGETAHUAN GURU IPA DALAM MEMBUAT MODUL PRAKTIKUM DI SMP TAMAN SASTRA JIMBARAN G. N. Sutapa; N. N. Ratini; I. M. Yuliara; I. G. A. Kasmawan
Buletin Udayana Mengabdi Vol 19 No 1 (2020): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.987 KB) | DOI: 10.24843/BUM.2020.v19.i01.p23

Abstract

Hasil identifikasi keberadaan tenaga laboratorium IPA di SMP Taman Sastra Jimbaran Kuta Selatan, Badung adalah sekolah swasta yang menunjukkan bahwa umumnya kualifikasi pendidikan tenaga yang ditugaskan di laboratorium IPA belum memenuhi persyaratan standar tenaga laboratorium sekolah. Data yang diperoleh dari interview dengan guru IPA di SMP Taman Sastra Jimbaran, menyatakan bahwa sebagian besar guru IPA masih mengalami masalah untuk melakukan praktikum tentang topik-topik tertentu, tidak semua konsep-konsep IPA eksperimental dapat diajarkan dengan praktikum karena keterbatasan alat-alat dan bahan yang tersedia. Salah satu kendala yang menghambat kelancaran pelaksanaan pembelajaran IPA di laboratorium adalah terbatasnya jumlah dan/atau jenis alat yang tersedia dan belum memiliki petunjuk praktikum yang tersusun secara permanen (dalam bentuk Modul). Hasil pengabdian ini telah mengasilkan beberapa alat praktikum sederhana dan dilengkapi dengan modul praktikum yang telah tersusun dengan baik. Diakhir kegiatan alat praktikum dan modul prkatikum diserahkan kepada SMP Taman Sastra Jimbaran. . Kata kunci : Laboratorium, alat praktikum, modul praktikum
ANALISIS WAKTU PEMUPUKAN TANAMAN SAWI HIJAU (Brassica rapa var. parachinensis) DENGAN TEKNIK PERUNUT RADIOAKTIF Gusti Ngurah Sutapa; Ni Nyoman Ratini; Gde Antha Kasmawan
Jurnal Biologi Udayana Vol 20 No 1 (2016): Jurnal Biologi
Publisher : Program Studi Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Udayana

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Abstract

Telah dilakukan penelitian analisis waktu pemupukan pada tanaman sawi hijau (Brassica rapa var. parachinensis)dengan teknik perunut radioaktif. Untuk menuju sistem pertanian berkelanjutan perlu adanya perbaikan pertanian(intensifikasi) selama beberapa tahun yang lalu masih signifikan, karena ketersediaan sumber daya alam danteknologi pertanian cukup memadai dan berimbang dengan ketersediaan lahan dan peningkatan jumlah penduduk.Keadaan ini sulit untuk dipertahankan dimasa yang akan datang, kecuali ada pendekatan baru yang menawarkan ide dan teknik untuk meningkatkan produktifitas pertanian. Efesiensi pemupukan tanaman dengan teknik perunut (tracer) radioisotop adalah salah satu potensi menujusistem pertanian berkelanjutan. Teknik perunut dapat digunakan antara lain untuk mempelajari hubungan antaratanah dan tanaman, menentukan kondisi optimal dalam penggunaan pupuk (waktu pemupukan, pola perakaranaktif tanaman, jenis dan takaran pupuk), mempelajari proses dekomposisi dan mineralisasi bahan organik, sertamempelajari proses fotosintesis tanaman,baik dengan metoda langsung maupun tidak langsung.Waktu pemupukanyang lebih tepat dapat ditentukan dengan teknik perunut tersebut, sehingga optimalisasi pemupukan dapat dicapai,tanpa pemborosan yang tidak berguna.Dari penelitian dengan menggunakan radioisotop P, ternyata waktupemupukan pada tanaman sawi hijau (Brassica rapa var. parachinensis) yang paling signifikan adalah padapukul 9.00 pagi. Waktu siang hari mulai pukul 11.00 sampai pukul 15.00 adalah waktu pemupukan yang sangatburuk. Sedangkan waktu sore hari yaitu pukul 15.00 sampai 17.00 menunjukkan waktu pemupukan yang semakinbaik namun tidak signifikan.32
Identifikasi Unsur Radioaktif Pada Batako Ringan Aerasi Citicon Dengan Metode Laser Induced Breakdown Spectroscopy (LIBS) Wahyulianti Wahyulianti; Ni Nyoman Ratini; I Wayan Balik Sudarsana
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

Research has been done to identify the radioactive elements in the Citicon aerated lightweight concrete block sample. In this research used a Citicon aerated lightweight concrete block as a sample with 1 cm x 3 cm in size and identification process used LIBS method. Radioactive elements identified in Citicon aerated lightweight concrete block the LIBS method were Th, Ra, and K. The number of photon emission intensity at the wavelength of each element is 396.710 nm, 620.033 nm, and 766.497 nm respectively by 62.33 a.u, 1.67 a.u, and 72.75 a.u.
Pengenalan Pola Reflektansi Spektral Mangrove Di Teluk Benoa Sebagai Indikator Perubahan Kerapatan Berbasis Citra Landsat 8 Wiwik Kurniawati; I Made Yuliara; Ni Nyoman Ratini; Windarjoto Windarjoto
BULETIN FISIKA Vol 23 No 1 (2022): 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.2022.v23.i01.p07

Abstract

Studies have been conducted on the introduction of spectral reflectance patterns as an indicator of changes in mangrove density distribution using landsat 8 imagery time series data, in benoa bay area, Bali. Methods and analyses use spectral reflectance and the Vegetation Normalized Difference Vegetation Index (NDVI). The results of determining the value of spectral reflectance show that, changes in mangrove spectral reflectance patterns in Benoa Bay from 2017-2020 have decreased and increased for each band. In the pattern of reflectance band 5 can be used as a reference there has been a reduction in mangrove area, where the smaller the value of reflectants in band 5 in 2017-2020 shows a reduction or change in mangrove density in the year is getting larger. Based on the data of NDVI vegetation index image distribution in 2017-2020 obtained wide cover per category that there is a reduction in mangrove area from 2017 to 2018 of 36.72 ha, but in 2019 mangrove area increased considerably from 2018 of 60.82 ha. In 2020 the mangrove area again experienced a fairly drastic reduction of 181.51 ha. The area recorded is still overgrown with mangroves in 2020 only amounting to 852.39 ha.
Pengaruh Kombinasi Arus Tabung Sinar-X dan Waktu Eksposi Terhadap Contrast to Noise Ratio (CNR) dengan menggunakan Computed Radiography Ni Wayan Mega Savira Utami; Ratini Ni Nyoman; Juliantara I Putu Eka
BULETIN FISIKA Vol 23 No 1 (2022): 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.2022.v23.i01.p04

Abstract

A research has been carried out to determine the effect of the combination of X-ray tube current and exposure time on the Contrast to Noise Ratio (CNR) using Computed Radiography (CR). This study aims to determine the combination of X-ray tube current and exposure time on the quality of X-ray images using CR and the optimal value of its CNR. The tool used is a step wedge with an additional 1.5 mm thickness at each step, a constant tube voltage of 56 kV, an X-ray tube current and an exposure time of 5 mAs. Variations in the value of 5 mAs into the X-ray tube current and exposure time are as follows, variation 1 of 100 mA and 0.050 s, variation 2 of 125 mA and 0.040 s, variation 3 of 160 mA and 0.032 s, variation 4 of 200 mA and 0.025 s, and variation 5 of 250 mA and 0.020 s. Reading the values ??of Is, Ib, and ?b using the RadiAnt DICOM VIEWER 2020.1 software program (64 bit) and analyzing the effect of the combination of X-ray tube current and exposure time on CNR values ??using IBM SPSS Statistic 26 with One Way-ANOVA Test. The results of the analysis showed that the combination of X-ray tube current and exposure time had no effect on the CNR value. The optimal value of CNR is 42.37, obtained in variation 3, namely the X-ray tube current is 160 mA and the exposure time is 0.032 s.
Effects of Photosynthetic Activity Radiation (PAR) on Green Mustard Plant Growth (Brassica rapa var. parachinensis L.) Ni Nyoman Ratini; I Wayan Supardi; Yuli Nurfadhillah
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

A research on the effect of photosynthetic active radiation (PAR) on the growth of green mustard plants has been conducted. The radiation source used is sunlight. Samples have been grouped as a sample which treated by red filter (P1), by orange filter (P2), by purple filter (P3), by green filter (P4), by blue filter (P5) and a sample without filter as a control (P0). Each sample consisted of four plants. The planting was carried out using polybags with compost media. Observations were made from the nursery phase to the slow vegetative phase (day 3rd, when all plants had grown shoots until day 63rd of the harvest). Parameters measured include light intensity, plant height and number of leaves. Measurement is done every three days. Also it measured plant biomass on the last day of observation (63rd day). The results showed that the intensity of each sample had an impact on the harvest. The best growth rate is obtained in P2, both in the nursery phase and fast vegetative phase i.e. 0.119 cm/day and 0.194 cm/day, respectively. While the highest growth rate was obtained in the P3 sample, namely the slow vegetative phase (0.035 cm/day). Overall the best planting results were obtained in P2 samples with plant height of 23.18 cm, number of leaves of 12 strands and plant biomass of 33.56 g.
PERSENTASE DOSIS KEDALAMAN (PERCENTAGE DEPTH DOSE) DENGAN PESAWAT TELETERAPI COBALT-60 FCC 8000 F DI RSUP SANGLAH DENPASAR Grace Christine Djara; Ni Nyoman Ratini; I Wayan Balik Sudarsana
BULETIN FISIKA Vol 16 No 1 (2015): 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

Successful implementation of treatment using Cobalt-60 8000 F FCC, strongly influenced the precision and accuracy of the implementation is largely determined by the data PDD. Based on the research the value of PDD at a depth of 0 cm with a broad range of the field is at 39.7% - 48.5%, while the maximum value reached 100%  PDD found at a depth of 0.5 cm. The amount of deviation between the results of a study of the data and BJR Sanglah reached 5% at a depth of 8 cm by 6 cm wide field x 6 cm and 8 cm x 8 cm, and the smallest deviation value of 0.1% found in a wide field 6 cm x 6 cm with depth 7 cm.keywords: cobalt-60, the percentage depth dose, dispersion values
PENENTUAN NILAI SUN PROTECTION FACTOR (SPF) SINAR MATAHARI DENGAN MENGGUNAKAN KAIN KATUN, POLIESTER DAN RAYON DI PANTAI KUTA Ni Putu Winiayu Veramika; I Gusti Ngurah Sutapa; Ni Nyoman Ratini
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

This research has been determined the value of a sun protection factor (SPF) of sunlight by using cotton, rayon, and polyester conducted at ten observation points along Kuta Beach, Bali. This research started by determination the intensity of the sunlight without fabric protector and the intensity of sunlight with a fabric protector such as cotton, rayon, and polyester with color blue, green, red, and yellow. Luxmeter is used to measure the intensity of sunlight in units of lux. The intensity was taken at the sunny weather in the range 10-11 o’clock to 16-17 o’clock. SPF value can be calculated by comparing the intensity of the sunlight without fabric protector (lux) with the intensity of sunlight with a fabric protector (lux). The intensity of sunlight in the range of 10-11 o’clock to 16-17 o’clock is approximately 59.760 lux to 138.660 lux. ANOVA analysis showed the intensity of sunlight at each point of observation did not differ significantly (. SPF value at each point varies and SPF values obtained for the maximum is the blue cotton fabric with SPF value is 30 and the minimum value is the yellow polyester fabric with SPF value is 3.
Co-Authors A. A. Ngurah Gunawan Anastasya Jessning Gamalita Mberato Mberato Dhea Vonisa Girsang Feriandanu Hakim Fitriyani Mus Mulyadi Grace Christine Djara Gusti Ngurah Sutapa Hery Suyanto I Gde Antha Kasmawan I Gede Erix Krisna Adi Pramartha I Gusti Agung Ayu Ratnawati I M. S. Wibawa I Made Yuliara I Made Yuliara I Putu Eka Juliantara I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Budiastra I Wayan Supardi I. M. Yuliara I. M. Yuliara Ida Bagus Made Suryatika Komang Sugiarta Made Aditya Jaya Mahardika Maghfirotul Iffah N. L. P. Trisnawati Ni Komang Tri Suandayani Ni Luh Putu Trisnawati Ni Putu Winiayu Veramika Ni Wayan Mega Savira Utami pandu lukito Pingki Setyowati Dewi Puja Satwika Luh Gede Putu Irma Wulandari Putu Wida Gunawan Rozi Irhas Siti Raudatul Jannah Suandayani, Ni Komang Tri Syarifuddin Syarifuddin Trisnawati, Ni Luh Putu Wahyulianti Wahyulianti Winardi Tjahyo Baskoro Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto, Windarjoto Windaryoto, Windaryoto Wiwik Kurniawati Yuli Nurfadhillah Yuliara, I Made