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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 14 Documents
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Search results for , issue "Vol 4, No 2 (2015): October 2015" : 14 Documents clear
SYNTHESIS AND CHARACTERIZATION OF BIODEGRDABLE PLASTIC FROM CASAVA STARCH AND ALOE VERA EXTRACT WITH GLYCEROL PLASTICIZER Apriyani, Mery; Sedyadi, Endaruji
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.403 KB) | DOI: 10.21831/jsd.v4i2.9090

Abstract

Synthesis and characterizations of Biodegradable Plastic made of Cassava Waste Starch, glycerol, acetic acid and Aloe vera extract has done. The aims of this research are to study the influence of addition of aloe vera extract in plastics mechanics properties, water vapor transmission rate and biodegradation. There are five main steps in this research, extraction of aloe vera, cassava starch preparation from cassava waste, preparations, characterization and biodegradability study of biodegradable plastic. The addition variations of aloe vera extract that used in this research are 0.01; 0.03; 0.05; 0.07 and 0.14 grams. Results showed that the addition of aloe Vera tends to increased biodegrable plastic thickness to 0.01 mm and elongation to 32.07%. However, biodegradable plastic tensile strength tends to decreased to 23.95 Mpa. Optimum tensile strength is 3.90 Mpa and elongation is 34.43%. Optimum water vapor transmission rate is 2.40 g/m2hours. Biodegradation study of biodegradable plastic showed that addition of aloe vera extract doesn’t significantly influence in plastic degradations.
APLIKASI KOORDINAT PARALEL DI DALAM RUANG DIMENSI 4 PADA DISPLAY LALU-LINTAS PESAWAT Hartono Hartono; Kus Prihantoso Krisnawan; Husna Arifah
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v4i2.9814

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
PEMECAHAN MOLEKUL AIR DENGAN MENGGUNAKAN MEDIA TEPUNG UMBI DAHLIA (DAHLIA PINNATA) Isana SYL; Dewi Yuanita; Heru Pratomo
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (693.884 KB) | DOI: 10.21831/jsd.v4i2.12121

Abstract

Air dan limbah cair melimpah di bumi, sehingga pemanfaatannya sebagai sumber energi menjadikan tantangan tersendiri. Molekul air dapat dipecah menjadi gas-gas hidrogen dan oksigen dengan berbagai cara. Gas hidrogen merupakan bahan bakar yang ramah lingkungan, yang layak menggantikan bahan bakar fosil, yang makin menipis persediaannya di alam, sehingga usaha-usaha yang berkaitan dengan penyediaan energi terbarukan perlu mendapat dukungan dari berbagai pihak. Proses elektrolisis telah lama dikenal, merupakan salah satu cara memecah molekul air menjadi gas-gas hidrogen dan oksigen, tetapi secara umum masih memiliki efektivitas rendah. Oleh karena itu diperlukan upaya-upaya peningkatan efektivitas elektrolisis, baik dari sisi elektroda maupun elektrolit yang digunakan. Pada penelitian ini telah dilakukan elektrolisis air dalam suasana basa dengan menggunakan NaHCO3, media tepung umbi dahlia dan elektroda kerja stainless steel. Metoda penelitian yang digunakan voltametri siklik dengan menggunakan alat voltameter eDAQ EChem, yang mampu menggambarkan alur tegangan dan arus yang digunakan selama elektrolisis. Adanya tepung umbi dahlia menyebabkan terjadinya covering di sekitar permukaan elektroda sehingga proses pemecahan molekul air menjadi terhambat. Covering optimum terjadi pada penambahan 9 gram tepung umbi dahlia per liter air.Kata kunci: pemecahan molekul air, voltamogram, umbi dahlia, stainless steel, covering
SPECIES INVENTORY OF AMPHIBIOUS FISH IN INTERTIDAL ZONE OF NGRENEHAN, NGOBARAN AND NGUYAHAN COASTELS, GUNUNG KIDUL, YOGYAKARTA Sukiya Sukiya; Rizka Apriyani Putri
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.295 KB) | DOI: 10.21831/jsd.v4i2.12122

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

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