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Jurnal Sains Dasar
ISSN : 20859872     EISSN : 24431273     DOI : 10.21831
Core Subject : Education,
Arjuna Subject : -
Articles 201 Documents
SPECIES INVENTORY OF AMPHIBIOUS FISH IN INTERTIDAL ZONE OF NGRENEHAN, NGOBARAN AND NGUYAHAN COASTELS, GUNUNG KIDUL, YOGYAKARTA Sukiya, Sukiya; Putri, Rizka Apriyani
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

Tropical region is high on faunal diversity including vertebrates and invertebrates. Research on diversity of amphibious fish in Intertidal zone of  Yogyakarta southern coast is still limited so there is no complete records regarding these unique fish. This research aimed to know the diversity of amphibious fish in three beaches of Yogyakarta southern coast, namely pantai Ngrenehan, Ngobaran dan Nguyahan. Fish sampling were conducted using random sampling method combined with observational method. Fish were collected using small nets then identified to species rank. The total length of each fish were measured and recorded. Few individuals of the same species were sacrificed as voucher specimens. The result showed that in pantai Ngrenehan, Ngobaran, and Nguyahan, five different species of amphibius fish were found, which are Cabillus lacertops, Bathygobius fuscus, Enneapterygus sp., Blenniella cyanostigma, and Blenniella caudolineata. Cabillus lacertops was found in all of sampling locations. Enneapterygus sp. was found in pantai Nguyahan while Bathigobius fuscus, and Blenniella caudolineata can only be found in pantai Ngrenehan. Further studies regarding the adaptation, ecological features, taxonomy and biological reproduction of Yogyakarta southern coast’s  amphibious fish are still needed. Keywords: Inventarization, amphbious fish, intertidal zone, Yogyakarta southern coast
DISTRIBUTION OF PARASTATISTICS FUNCTIONS: AN OVERVIEW OF THERMODYNAMICS PROPERTIES SYL, Isana; Yuanita, Dewi; Pratomo Al, Heru
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

Water is abundant on Earth, so its utilization as an energy source makes its own challenges. Water molecules can be reacted into hydrogen and oxygen gasses in various ways. Hydrogen gas is an environmentally friendly fuel, reliable substitution for fossil fuel which is depleting within time, so the efforts relating to the provision of renewable energy needs support from various parties. Electrolysis is a well known process, which is one of the ways to react the water molecule into hydrogen and oxygen gas, but it has low effectiveness generally. Therefore, it is necessary to have the efforts increasing the effectiveness of electrolysis process, both in terms of electrodes and the electrolyte used. This study had conducted on base condition with NaHCO3 addition, on dahlia tuber starch media, and using working electrode stainless steel and stainless steel/Fe-Co-Ni. The method of research  was using linear and cyclic voltammetry using eDAQEChem voltammeter apparatus, which is able to describe the flow of voltage and current used within electrolysis process. The existence of dahlia tuber starch leads to cover the surface of the electrode so that the process of water molecules reaction becomes obstructed. It is obtained that the optimum covering of electrode surface is achieved in the addition of 9 grams of dahlia tube starch in one liter of water.Keywords: water molecule dissociation reaction, voltammograms, dahlia tuber starch, stainless steel, covering
PARALLEL COORDINATE APPLICATION IN 4 DIMENSION ROOM AT PLANE TRAFFIC DISPLAY Hartono, Hartono; Krisnawan, Kus Prihantoso; Arifah, Husna
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

This research aims to describe ann-dimensional line on a parallel coordinate and uses the representation as a display of aircraft motion which flies at a straight line and constant velocity. A parallel coordinate of n-dimensional space depicted in the form of nparallel vertical lines which represent axis.Every two adjacent axes have the same distance. A horizontal line that cutsall axes indicates the initial pointsof each axis. In a parallel coordinate,an 15n"> -dimensional point is represented as a polygonal chainwhere the vertices located on its axis. Based on the representations of some of collinear points, a line is described on a parallel coordinate. On the other hand, one can consider a graph of an aircraft motion as a graph of a 4-dimensional space. At a constant speed with a straight line orbit, the graph of an aircraft movementis a graph of 4-dimensional line. The result shows that, on a parallel coordinate, an n-dimensional line represented as 15n-1">  dots. As a consequence, the graph of an aircraft that moveat a constant speed with a straight line orbitrepresented as3 dots. By this representation, the coordinate and altitude of the aircraft can be observes at anytime. It also shows whether the movement of an aircraft disturb (strike or too close to) another plane or not. Keywords: parallel coordinate, n-dimensional space, aircraft movement display
Age and Temperature of Globular-Open Star Clusters Case Study : M3 M35 and M67 Thassana, Chewa; Maithong, Wiraporn
Jurnal Sains Dasar Vol 6, No 2 (2017): October 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

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Abstract

In this work, the age and the temperature of the globular cluster M3 and the open clusters M37 and M67 were observed by CCD Photometer via a 0.5-meter Rithchey-Chertien Reflecting Telescope at Regional Observatory for the Public Nakhon Ratchasima, Thailand ; images were obtained of the cluster stars in B and V photometric filter. The magnitude of the cluster stars were analyzed by Iris and Aperture Photometry Tool (ATP) program. The age and temperature of M3, M35 and M67 clusters were calculated by the apparent magnitude and color index (B-V) of the Hertzsprung-Russell diagram . Our results shown that the both open cluster M35 and M67 were found to lie at a distance of 2,700 light years (832pc) from the Earth. In addition, the M35 is approximately 110 million years old and the temperature in range of 7,000 -13,000K. Meanwhile M67 is roughly 3.11 billion years old, the temperature is about 4,400K to 6,400K. However, we determined that the globular cluster M3 is approximately 11.1 billion years old and located 34,000 light years (10,420pc) away from the Earth, while temperature is around 3,600 -6,800K.
Uji Aktivitas Fraksi Metanol dan N-Heksan Kulit dan Kernel Biji Kebiul (Caesalpinia bonduc L.) sebagai Tabir Surya Dwi Fitri Yani; Rio Dirmansyah
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.v10i1.39065

Abstract

Penelitian ini bertujuan untuk menguji aktivitas tabir surya fraksi metanol dan n-heksan kulit dan kernel biji kebiul secara in vitro dengan menggunakan spektrofotometri UV-Vis. Uji aktivitas tabir surya ditentukan berdasarkan nilai sun protection factor (SPF) dari masing-masing fraksi kulit dan kernel biji kebiul. Hasil uji fitokimia ekstrak metanol kulit biji kebiul memiliki kandungan flavonoid, tanin, saponin dan steroid. Sedangkan kernel biji kebiul positif mengandung flavonoid, saponin dan steroid. Penentuan nilai SPF didasarkan pada persamaan Mansur menggunakan spektrofotometri UV-Vis dengan panjang gelombang 200-400 nm. Hasil pengujian menunjukan bahwa ekstrak metanol kulit biji kebiul memiliki aktivitas perlindungan ultra dengan nilai SPF secara berturut-turut pada konsentrasi 200, 400, 600, 800, dan 1000 ppm yaitu 5,4; 9,7; 14,0; 18,1 dan 19,8. Sedangkan ekstrak methanol kernel biji kebiul memiliki aktivitas perlindungan minimal dengan nilai SPF secara berturut-turut pada konsentrasi 200, 400, 600, 800, dan 1000 ppm yaitu 0,9; 1,4; 2,9; 2,4 dan 2,6. Dari hasil nilai SPF fraksi metanol memberikan aktivitas yang lebih baik dari pada fraksi n-heksan.Kata Kunci : Caesalpinia bonduc L.; Tabir Surya; SPF.
Pengaruh Konsentrasi HCl terhadap Mikrostruktur dan Sifat Kemagnetan Nanopartikel Fe3O4 yang Disintesis dari Pasir Besi Pantai Glagah Kulonprogo Pinaka Elda Swastika; Farida Hardheyanti; Rita Prasetyowati; Ariswan Ariswan; Warsono Warsono
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.v10i1.39141

Abstract

Nanopartikel Fe3O4 yang berasal dari pasir besi pantai Glagah Kulon Progo telah berhasil disintesis menggunakan metode kopresipitasi dengan berbagai variasi konsentrasi HCl (10%, 15%, 25% dan 37%). Pengaruh konsentrasi HCl terhadap mikrostruktur dan sifat kemagnetan dari Fe3O4 dilihat dengan menggunakan XRD, SEM EDX serta VSM. Hasil XRD menunjukkan bahwa Fe3O4 yang dihasilkan memiliki struktur kristal kubik invers spinel. Semakin besar konsentrasi HCl, semakin baik derajat kristalinitasnya. Hasil SEM EDX untuk sampel Fe3O4 dengan konsentrasi HCl 37% menunjukkan ukuran butir (grain) yang hampir sama serta tingkat kemurnian sampel Fe3O4 yang dihasilkan sebesar 100% (Fe 72,42% dan O 27,58%). Hasil VSM menunjukkan Fe3O4 hasil sintesis memiliki sifat superparamagnetik serta bersifat soft magnetic. Nanopartikel Fe3O4 dengan konsentrasi HCl 25% memiliki Hc, Mr dan Mmax masing-masing sebesar 0,0215 T, 11,60 emu/gr dan 36,51 emu/gr. Sedangkan Nanopartikel Fe3O4 dengan konsentrasi HCl 37% memiliki Hc dan Mr yang lebih kecil yaitu masing-masing sebesar 0,0017 T dan 10,83 emu/gr serta Mmax yang lebih besar yaitu 36,82 emu/gr.
Aplikasi Dekomposisi Nilai Singular dan Transformasi Kosinus Diskrit untuk Perbaikan Kualitas Citra Satelit Landsat Yori Kurniasari; Karyati Karyati
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.v10i1.39571

Abstract

Citra landsat (land satellite) merupakan data citra area daratan dan lautan di bumi. Data citra tersebut tersedia dalam Sistem Informasi Geografis (SIG). Banyaknya aplikasi SIG menyebabkan adanya perbedaan kualitas citra satelit landsat. Buruknya kualitas citra satelit yang diperoleh dapat menyusahkan beberapa pihak yang membutuhkan letak geografis dengan jelas. Oleh sebab itu, perlu dilakukan perbaikan kualitas suatu citra satelit. Pada penelitian ini menggunakan dua tahapan metode yaitu dengan transformasi kosinus diskrit dan dekomposisi nilai singular. Tahapan pertama dengan transformasi kosinus diskrit yang bertujuan untuk mengurangi gangguan dasar citra dengan membaginya menjadi beberapa komponen dasar. Tahapan kedua dengan dekomposisi nilai singular yang merupakan metode untuk mengekspos struktur citra sehingga dapat diketahui beberapa properti penting dari suatu matriks. Dengan kedua tahapan tersebut, dapat dilakukan proses perhitungan secara matematis dan aplikatif dalam proses perbaikan kualitas citra satelit. Hasil akhir dari penelitian ini berupa aplikasi perbaikan kualitas citra satelit landsat.Kata kunci: kualitas citra, citra landsat, transformasi kosinus diskrit, dekomposisi nilai singular
Penggunaan Shelter yang Berbeda terhadap Performa Udang Windu (Penaeus monodon) dengan Sistem Zero Water Discharge Nuralim Nuralim; Rahim Rahim; Asni Asni
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.v10i1.39740

Abstract

Penelitian ini  bertujuan untuk mengetahui pengaruh penggunaan shelter terhadap pertumbuhan dan kelangsungan hidup post Larva udang windu (Penaeus monodon) dengan sistem zero water discharge. Waktu pelaksanaan pada bulan Agustus-Oktober 2020. Rancangan percobaan yang dilakukan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 3 kali pengulangan. Adapun perlakuan tersebut yaitu A= shelter ranting bakau, B= shelter pelepah pepaya, C= shelter ijuk.  parameter yang diamati pada penelitian ini adalah kelangsungan hidup, pertumbuhan bobot mutlak, laju pertumbuhan spesifik, rasio konversi pakan dan kualitas air. Hasil penelitian menunjukkan bahwa penggunaan shelter tidak berpengaruh nyata terhadap pertumbuhan dan dan kelangsungan hidup post larva udang windu yang dipelihara dengan sistem zero water discharge
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.
Penyelesaian Masalah Perturbasi pada Persamaan Difusi Konveksi menggunakan Metode Formal Expansion Destia Nurfadhilah; Nikenasih Binatari
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.v10i1.39838

Abstract

Perambatan panas merupakan contoh kasus pemodelan persamaan diferensial parsial yang aplikasinya banyak ditemukan dalam kehidupan sehari-hari. Salah satunya persamaan difusi konveksi. Pada penelitian ini, akan dibahas mengenai penyelesaian masalah perturbasi pada persamaan difusi konveksi dengan menggunakan metode formal expansion. Pada pemodelan digunakan prinsip konservatif dengan asumsi batang logam homogen dan kecepatan  fluida yang bernilai sangat kecil. Syarat batas yang digunakan adalah syarat batas Dirichlet homogen. Metode formal expansion dilakukan derat melakukan pendekatan deret taylor pada solusi fungsi di sekitar nilai perturbasi sama dengan nol. Dengan menyamakan koefisien pada suku epsilon berpangkat, diperoleh 3 jenis masalah nilai awal syarat batas. Ketiga jenis masalah tersebut kemudian dicari solusi eksak menggunakan metode separasi varibel dan metode ekspansi fungsi eigen. Darisini, solusi eksak dari persamaan difusi konveksi diperoleh.

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