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INDONESIA
Jurnal Sains Dasar
Published by Universitas Negeri Yogyakarta
ISSN : 20859872     EISSN : 24431273     DOI : 10.21831
Core Subject : Education,
Education
Arjuna Subject : -
Articles 237 Documents
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Pengaruh Konfigurasi Geometri Buffer Resonator Tipe-H terhadap Intensitas Bunyi R. Yosi Aprian Sari; Agung Bambang Setio Utomo; Mitrayana Mitrayana; Danang Lelono
Jurnal Sains Dasar Vol 9, No 1 (2020): April 2020
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v9i1.38920

Abstract

Intensitas bunyi dari perambatan akustik pada resonator tipe-H dipengaruhi oleh konfigurasi saluran buffer. Bertambahnya panjang buffer tidak lebih berpengaruh terhadap intensitas bunyi dibandingkan dengan perubahan diameter saluran. Hal ini disebabkan adanya head loss, yaitu energi gelombang yang datang tidak semuanya ditransmisikan, tapi sebagian dipantulkan sehingga akan mengurangi intensitas bunyi yang ditransmisikan. Efek head loss ini terjadi di antaranya berupa gesekan pada sistem saluran dan tumbukan karena sambungan atau diskontinuitas saluran. Dalam penelitian ini dilakukan simulasi perambatan akustik dalam resonator tipe H menggunakan metode matriks transmisi dan persamaan Bernoulli. Dengan memvariasi panjang dan jari-jari buffer diperoleh nilai simulasi dari frekuensi resonansi resonator tipe H tersebut sebesar 1631 Hz.
Safety Analysis of Advanced CANDU Reactor-700 (ACR-700) during Transient and Emergency Condition using ACR Simulator Fathoni Shidik, Muhammad; Siti Nuraini Mahmudah, Rida
Jurnal Sains Dasar Vol 10, No 1 (2021): April 2021
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v10i1.39803

Abstract

The development of nuclear technology leads to improvement in nuclear power plant design. The latest generation of the nuclear reactor tries to rely more on passive system to minimize the human intervention and increase the safety of the nuclear power plant itself. ACR-700 is designed to be able to cope with some transients condition. This study try to simulate the condition of ACR-700 during the transient condition loss of one of reactor coolant pump using ACR Simulator developed by IAEA. The ACR-700 safety system successfully identify the malfunction and stop the malfunction to escalate. In addition to that, this paper also try to simulate the previous transient condition with another malfunction in reactor setback and setback system, one of the safety system of the ACR-700.
Model Development of NIÑO 3.4 and Indian Ocean Dipole (IOD) Anomalies Teleconnection Saputra, Antonni; Hermawan, Eddy; Darmawan, Denny
Jurnal Sains Dasar Vol 7, No 2 (2018): October 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i2.38551

Abstract

The purpose of this research is to develop the teleconnection model of Niño 3.4 and IOD anomalies which can be used as reference to explain precipitation anomalies. El-Niño and IOD cycles are shown as the warming process of sea surface temperatures where for El-Niño is in the Pacific Ocean and IOD is in the Indian Ocean and each of them forms a cycle over a certain period of time. The method used to determine the dominant oscillation of the teleconnection of Niño 3.4 and IOD anomalies is Power Spectral Density (PSD), and to model the teleconnection of Niño 3.4 and IOD anomalies is ARIMA (Autoregressive Integrated Moving Average). The data used are Niño 3.4 index which is one type of index for El-Niño and IOD index. The results are Power Spectral Density (PSD) graphs for the teleconnection of Niño 3.4 and IOD anomalies which oscillates around 5 years. By the ARIMA method, the approximate model for the data of teleconnection of Niño 3.4 and IOD is ARIMA (1,1,2) with equation of Zt = 1.516  Zt-1 - 0.516 Zt-2 - 0.256 at-1 + 0.021 at-2.
Karakterisasi Fenotipik dan Aktivitas Antimikrobia Bakteri Asam Laktat dari Limbah Produksi Tempe Erlin Amelia Santosa; Endah Retnaningrum
Jurnal Sains Dasar Vol 9, No 1 (2020): April 2020
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v9i1.34486

Abstract

Selama proses pembuatan tempe, dihasilkan limbah cair berupa air rendaman kedelai yang mengandung berbagai jenis Bakteri Asam Laktat (BAL). Penelitian ini bertujuan untuk mengetahui karakter fenotipik dan aktivitas antimikrobia BAL dari limbah produksi tempe. Isolat BAL yang terdapat pada limbah produksi tempe dikarakterisasi secara morfologis, biokimiawi dan fisiologis untuk selanjutnya dianalisis dengan metode profile matching yang mengacu pada Bergey’s Manual of Systematic Bacteriology. Pengujian aktivitas antimikrobia dilakukan dengan metode spot on the lawn dan dan dianalisis secara statistik dengan menggunakan metode One Way Anova (taraf kepercayaan 95%). Diperoleh empat isolat BAL, dimana strain ES1B dan ES1G teridentifikasi sebagai Lactobacillus fermentum, sedangkan strain ES1F dan ES2D teridentifikasi sebagai Lactobacillus plantarum. Seluruh isolat BAL menunjukkan aktivitas antimikrobia terhadap Staphylococcus aureus dan Escherichia coli dengan daya hambat rendah, kecuali strain ES2B dan ES1G yang menunjukkan daya hambat sedang terhadap Escherichia coli (zona hambat sebesar 16,33 ± 1,53 mm dan 17,0 ± 1,0 mm).  
Potential Makroalga on the Beach Karapyak to the Development of Power Stations Biogas Seaweed (Seawees Biogas Power Plant) Nuryadin, Egi
Jurnal Sains Dasar Vol 7, No 2 (2018): October 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i2.21755

Abstract

Energy resources in Indonesia need to use alternative energy. According to the world energy board, energy use tends to increase by 50 percent by 2020. Indonesia is an archipelagic country that has vast and tropical waters and this makes indonesia has a high potential for developing renewable energy from macroalgae. Karapyak beach area is a coastal area in southestern west java that has abundant water biodiversity and high potential for the development of marine biotechnology. Abundant macroalgae in the karapyak beach is Gracilaria Sp, which can be used as biogas. Then this study was conducted to determine the potential of Gracilaria Sp, as an alternative material for biogas which would later become an alternative energy power plant. Biogas quality determination can be seen from the content of CO2, CH4, C2H5OH, dan CH3OH found in Glacilaria Sp. So that the potential for developing seaweed biogas electricity can be seen from the results of this study.
Optical Properties and Relative Determination of Caffeine in Black Tea Liquor Monika Rahardjo; Ferry Fredy Karwur; Ferdy Semuel Rondonuwu
Jurnal Sains Dasar Vol 8, No 2 (2019): October 2019
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v8i2.20781

Abstract

Caffeine is one of main quality parameter for teas, known for its ability to increase alertness, and has a slightly bitter flavor. As quality parameter, caffeine content will later determine flavor and aroma profile for teas that affect the price in global market. There were many factors that affected chemical compounds in tea, one of it was growth altitude. This research aimed to characterize caffeine spectra from tea liquor using UV-Vis visible which later can be used to relate caffeine content with the altitude of tea sample plantation. The optical transition of caffeine from brewed tea leaves liquor was measured from a variety of black tea products produced according to quality standards for global market. A total of 63 tea samples from four different grades (FANN, PekoFANN, FANN2, and Dust) and from 12 different tea estates in Indonesia have been replicated in their optical transitions and classified on the basis of caffeine content. It was found that caffeine content in tea products may vary depending on the grade and origin of the tea plantation. FANN grade has higher caffeine content that other grades while products from highland tea plantation generally have more caffeine content for all tea grades.
Optimasi Waktu dan Suhu Hidrotermal pada Sintesis Nanotabung TiO2 Terdoping Nitrogen untuk Aplikasi Fotokatalis Khoiriyah Lukman, Laila; Kusumawardani, Cahyorini
Jurnal Sains Dasar Vol 9, No 2 (2020): October 2020
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v9i2.38969

Abstract

Nanotabung nitrogen-doped TiO2 (N-TiO2) disintesis dengan metode hidrotermal dari titanium tetra isopropoksida (TTIP) sebagai precursor Ti, etilendiamin sebagai sumber nitrogen dan etanol sebagai pelarut. Pengaruh parameter sintesis dipelajari dengan melakukan variasi suhu (110, 130, dan 150ºC) dan waktu hidrotermal (24, 48, dan 72 jam). Material hasil sintesis dikarakterisasi menggunakan XRD dan spektroskopi UV-Vis DRS. Aktivitas fotokatalitik material nanotabung N-TiO2 diuji dalam reaksi degradasi metilen biru dilakukan. Hasil penelitian menunjukkan bahwa kenaikan suhu hidrotermal dan lama waktu hidrotermal menyebabkan ukuran kristal semakin besar, dan Egmenurun. Uji fotokatalis material hasil sintesis menunjukkan hasil terbaik pada sampel hasil sintesis pada temperatur 130ºC selama 48 jam yang memiliki karakteristik strukur lebih kristalin, energi celah pita yang relatif rendah, dan mampu mendegradasi metilen biru sebesar 74,94% di bawah sinar UV.
Zonasi dan Formasi Vegetasi Hutan Mangrove: Studi Kasus di Pantai Baros, Yogyakarta Tasya Rahmadhani; Yunita Fera Rahmawati; Raihanatu Qalbi; Nada Fithriyyah H. P.; Selma Nafilatul Husna
Jurnal Sains Dasar Vol 10, No 2 (2021): October 2021
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v10i2.43912

Abstract

Hutan mangrove Pantai Baros merupakan salah satu cagar alam di Indonesia. Ekosistem mangrove merupakan suatu tipe ekosistem hutan yang tumbuh di daerah pasang surut, terutama di pantai yang terlindung, laguna, dan muara sungai yang tergenang pada saat pasang dan bebas dari genangan pada saat surut yang komunitas tumbuhannya mampu bertoleransi terhadap garam. Penelitian ini bertujuan untuk mengetahui zonasi dan formasi vegetasi hutan mangrove di Pantai Baros, Bantul, Yogyakarta. Metode yang digunakan adalah metode purposive sampling dengan pengambilan sampel pada 2 transek. Data jenis mangrove dan jumlah mangrove di analisis secara deskriptif dalam bentuk tabel dan gambar. Hasil penelitian menunjukkan formasi mangrove di ekosistem mangrove Pantai Baros paling depan ditumbuhi banyak mangrove yaitu Avicennia lanata dan beberapa Avicennia marina, sedangkan daerah yang semakin ke dalam ditumbuhi Rhizophora apiculata. Persentase jenis mangrove terbanyak yang tumbuh pada kawasan mangrove Pantai Baros, Bantul, Yogyakarta adalah Avicennia lanata.
Penyelesaian Masalah Transportasi Fuzzy dengan Metode Pendekatan Monalisha pada Distribusi Air Perusahaan Daerah Air Minum (PDAM) Tirtamarta Agung Budi Wirawan; Karyati Karyati
Jurnal Sains Dasar Vol 10, No 2 (2021): October 2021
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v10i2.41805

Abstract

Masalah transportasi fuzzy merupakan suatu pengembangan dari masalah transportasi biasa. Tujuan dari masalah transportasi fuzzy adalah menentukan jadwal pengiriman yang meminimalkan total biaya transportasi (pengeluaran), dengan tetap memenuhi ketidakpastian dari parameter keputusan. Terdapat beberapa metode penyelesaian awal yang dapat digunakan dalam menyelesaikan masalah transportasi fuzzy, seperti Metode Pendekatan Monalisha. Penerapan penyelesaian masalah transportasi fuzzy banyak dilakukan pada permasalahan kehidupan sehari-hari. Salah satunya adalah pada pendistribusian air dengan area berskala besar khususnya pada Perusahaan Daerah Air Minum di suatu daerah, karena terdapat banyak faktor yang mempengaruhi proses distribusi tersebut. Oleh karena itu, diperlukan studi kasus untuk menerapkan penyelesaian masalah transportasi fuzzy pada masalah distribusi air, dengan lokasi studi kasus di Perusahaan Daerah Air Minum (PDAM) Tirtamarta Yogyakarta. Tahapan awal adalah dengan mengkaji model masalah transportasi fuzzy dan metode pendekatan Monalisha sebagai metode penyelesaian awal, serta metode fuzzy stepping stone untuk menguji keoptimalan penyelesaian awal. Tahapan selanjutnya adalah penerapan masalah transportasi fuzzy untuk menyelesaikan masalah distribusi air di PDAM Tirtamarta, yaitu dengan mengidentifikasi masalah aktual, merumuskan masalah menjadi model masalah transportasi fuzzy, menentukan penyelesaian awal, menguji keoptimalan penyelesaian awal, melakukan analisis hasil, dan membuat kesimpulan.
Morphological Characteristics and Mineral Content Analysis of Magnetic Minerals Based on River and Coastal Sand using SEM-EDX Lalu A. Didik; Isniwana Damayanti; Jumliati Jumliati; Putri Dinda Alfadia Lestari
Jurnal Sains Dasar Vol 10, No 2 (2021): October 2021
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v10i2.42217

Abstract

This study aims to analyze the mineral content and morphological characteristics of magnetic minerals based on coastal and river sand. Analysis of minerals content uses Atomic Absorption Spectroscopy (AAS) to determine the content of Fe and Energy Dispersive X-Ray (EDX) to determine the elements of magnetic minerals based on coastal and river sand. While the morphological characteristics were analyzed using Scanning Electron Microscope (SEM). Based on the AAS analysis, magnetic mineral based on coastal sand has higher Fe content (9.03 mg/gram) compared to magnetic mineral based on river sand (8.03 mg/gram). This is also confirmed by EDX analysis where the Fe content of magnetic mineral based on coastal sand is 2.07 ± 0.21%. This value is greater than the Fe content of magnetic mineral based on river sand which cannot be measured by EDX. Morphological analysis using SEM shows that magnetic mineral based on coastal sand has a relatively uniform particle size compared to magnetic mineral based on river sand. The particle size of magnetic minerals based on coastal sand also smaller than magnetic minerals based on river sand. Coastal sand also has finer size compared to river sand. This is because coastal sand sediments are formed due to the energy of sea waves so that they have a smoother structure. While river sand sediments come from limestone deposits that have a fine and coarse structure.

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