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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 16 Documents
 1   2 
Search results for , issue "Vol 3, No 2 (2014): October 2014" : 16 Documents clear
Temperature control system for infant incubator using DS18B20 sensor Laila Katriani; Arif Setiawan; Denny Darmawan
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2307.043 KB) | DOI: 10.21831/jsd.v3i2.4098

Abstract

A temperature control system for infant incubator using DS18B20 had been built. The dimension of the incubator was 45 x 35 x 35 cm3 and it used 200 W incandescent lamp as an heater element. The system was automated using ATMEGA328P and Triac as an actuator. It succeeded in keeping the incubator temperature at (36.5 ± 0.1) °C. It took around 10 minutes to reach the working temperature of 36.5 °C from room temperature of 26 °C.   Key words: temperature control system, infant incubator, DS18B20
The effect of activated carbon towards the Nernst factor value in sulphate sensor based on zeolite Fardiyah, Qonitah; Atikah, Atikah; Sulistyarti, Hermin
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.135 KB) | DOI: 10.21831/jsd.v3i2.4107

Abstract

Dalam penelitian ini telah dipelajari pengaruh karbon aktif terhadap harga Faktor Nernst sensor potensiometri ion sulfat berbasis zeolit. Harga Faktor Nernst dilihat dari perbandingan komposisi membran dengan dan tanpa penambahan karbon aktif. Komposisi membran adalah campuran bahan aktif ( zeolit - karbon aktif), polyvinyl klorida (PVC) sebagai matriks polimer, dioctyl phtalat (DOP) sebagai pemlastis dalam pelarut tetrahidrofuran (THF). Larutan uji yang digunakan adalah larutan K2SO4 pada rentang konsentrasi 1x10-8 – 1x10-1 M . Hasil penelitian menunjukkan komposisi membran tanpa penambahan karbon aktif dengan zeolit :  PVC : DOP sebesar 3 : 1 : 2  (b/b) dalam pelarut THF memiliki harga Faktor Nernst sebesar 27,65 mV/dekade konsentrasi. Komposisi  membran  dengan penambahan karbon aktif  diperoleh  zeolit :  karbon aktif : PVC : DOP sebesar 3 : 0,2: 1 : 2  (b/b) dalam pelarut THF memiliki harga Faktor Nernst sebesar 29,18 mV/dekade konsentrasi. Sensor potensiometri ion sulfat berbasis zeolit dengan penambahan karbon aktif memiliki karakteristik Nernstian dengan harga faktor Nernst sebesar 29,18 ± 1,9 mV/dekade konsentrasi, kisaran konsentrasi 10-5 – 10-1 M sulfat dan batas deteksi 4,27 x 10-6 M atau setara dengan 0,410 ppm sulfat. Kata kunci: komposisi membran, batas deteksi, Nernstian, kisaran konsentrasi
Surface tension of corrosion inhibitor of carbon steel in hard water medium Tety Sudiarti
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (54.795 KB) | DOI: 10.21831/jsd.v3i2.4108

Abstract

Corrosion inhibition of carbon steel in hard water medium is very important because most of water for cooling and/or heating system needed in various industries is hard water and it is flown through pipes made of carbon steel. Before this, a research has been done concerning the effectiveness of inhibitors of thiourea and cimetidine as corrosion inhibitors in this medium. Here, a research has been done concerning the measurement of surface tension of thiourea and cimetidine to determine whether these inhibitors show properties similar to surfactants, hence indicate micellar phenomena. The Result of this research indicated that both thiourea and cimetidine are surfactants. The micellar critical concentration for both inhibitors is in accordance with the inhibitor concentration with optimal efficiency.   Key words: surface tension, thiourea, cimetidine, surfactant
Effect of zeolite particles towards corrosion rate on carbon steel in acid environment Bambang Hari P; Hendriyana Hendriyana
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (178.395 KB) | DOI: 10.21831/jsd.v3i2.4109

Abstract

The process of metal corrosion when it occurred can not be stopped, except with prevention. Corrosion is the deterioration or degradation of the metal due to a redox reaction between a metal with various substances in the environment that produce compounds that are not desired. In a simple term, also referred to as the corrosion of metal corrosion process dominated by steel or iron metal. The corrosion of the metal is a result of the oxidation reaction. Steel metal will produce rust generally in the form of oxides or carbonates. The chemical formula of iron rust is Fe2O3.nH2O in the form of a reddish brown solid. Zeolite is a mineral compound that can serve as an adsorber, cation exchange, and as a catalyst. In this study the ability of zeolite as anion or cation exchange adsorber will be measured. Its role is to be studied, especially in the environment in reducing hydrogen ions. The method used is by soaking and hanging the test object in a container that contains a solution of sulfuric acid and hydrochloric acid. The focus of this study is the reduction of the test object in the environment (some variations) such that the correlation can be calculated to determine the corrosion rate of mild steel specimen (mild steel). The environment is made as an acidic environment and acidic environment given zeolite particles. The results obtained on the test specimen immersion in acid medium with 1 N H2SO4 concentration and zeolite particles are used as much as 50g / 600 ml obtained in the immersion corrosion rate. Test specimens given stress are more quickly corroded. The rate of corrosion of steel which was given stress is 1.833 mpy and the corrosion rate of steel that was not given stress is 1.758 mpy. The addition of zeolite can reduce the corrosion rate by 15.20%. Key words: corrosion, zeolite, stress, mpy, adsorber
On the othogonal trajectories and conformal mapping of complex variable functions Kus Prihantoso Krisnawan; Atmini Dhoruri
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.404 KB) | DOI: 10.21831/jsd.v3i2.4110

Abstract

This research goal is to investigate the connection of orthogonal trajectories, analitic functions, and conformal mapping. Orthogonal trajectories are the intersection of two families of mutually perpendicular curves. The analytical property of a complex function f(z) = u + iv is investigated using Cauchy-Riemann conditions and then the geometric shapes of u and v are interpreted. The results showed that if two functions are mutually harmonic conjugate, then they are mutually orthogonal trajectories. If two families of curves of mutually orthogonal trajectories are mapped by conformal mapping then the result functions are also mutually orthogonal trajectories.Key words: orthogonal trajectories, analytic functions, conformal mapping
Test for diphenilphikril hydrazyl (DPPH) free antiradical from acetate etil extract of nangka leaf (Artocarpus heterophyllus Lamk) Nasution, Hasmalina; Nst, Musyirna Rahmah
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (152.128 KB) | DOI: 10.21831/jsd.v3i2.4111

Abstract

Senyawa antioksidan memiliki peran yang sangat penting dalam kesehatan. Berbagai bukti ilmiah menunjukkan bahwa senyawa antioksidan mengurangi resiko terhadap penyakit kronis seperti kanker dan penyakit jantung koroner. Karakter utama senyawa antioksidan adalah kemampuannya untuk menangkap radikal bebas. Senyawa antioksidan dari tumbuhan seperti vitamin C, vitamin E, karoten, asam-asam fenol, polifenol, dan flavonoid diketahui berpotensi mengurangi resiko penyakit degeneratif. Salah satu tanaman obat yang memiliki banyak khasiat adalah tanaman nangka (Artocarpus Heterophyllus lamk). Tanaman nangka telah diketahui secara empiris khasiatnya baik pada bagian daun, buah, biji buah, getah, dan kayu. Daun nangka dapat digunakan sebaga pelancar ASI, borok, dan luka. Selain itu, bioaktifnya berkhasiat sebagai antikanker, antivirus, dan antiinflamasi. Oleh karena faktor lingkungan seperti iklim, cuaca, dan lokasi tumbuh sangat berpengaruh terhadap komponen aktif suatu tumbuhan, maka pada penelitian ini telah dilakukan pengujian aktivitas antiradikal bebas DPPH terhadap daun nangka (Artocarpus Heterophyllus lamk) yang ada di Pekanbaru. Aktivitas Antioksidan ekstrak etil asetat daun nangka yang mengandung saponin dan steroid memiliki nilai IC50 (Inhibition Concentration) sebesar 778,76 ppm terhadap radikal DPPH. Kata kunci: daun nangka, ekstrak, etil asetat,  antioksidan, DPPH
Development of functional food product based on cassava (manihot esculenta) in supporting food resistence Herlina, Eka; Nuraeni, Farida
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.87 KB) | DOI: 10.21831/jsd.v3i2.4112

Abstract

Diversifikasi pangan merupakan salah satu cara memperkokoh ketahanan pangan. Ubi kayu dapat digunakan sebagai alternatif bahan baku sereal pengganti beras. Ubi kayu dapat digunakan sebagai bahan baku pangan fungsional, yaitu berupa flakes dengan kandungan antioksidan karena memiliki skopoletin, salah satu komponen bioaktif yang dapat mempunyai fungsi fisiologis bagi kesehatan. Penelitian ini dilakukan dengan mensubstitusi tepung ubi kayu pada pembuatan flakes ubi kayu menggunakan tepung kacang merah dengan berbagai perbandingan yaitu tepung ubi kayu: tepung kacang merah 5:0, 4:1, 3:2, 2:3, dan 1:4. Dalam penelitian ini juga dilakukan tahap perbaikan proses pembuatan tepung dengan melakukan heat shock sebelum penyawutan dan tahap selanjutnya analisis nilai gizi dari produk flakes yang dihasilkan antara lain protein, air, lemak, karbohidrat, serat kasar, vitamin A, vitamin E, dan vitamin C dan dilakukan uji DPPH untuk mengetahui aktivitas antioksidan serta dilakukan uji organoleptik yaitu uji hedonik untuk mengetahui kadar kesukaan konsumen terhadap produk yang dihasilkan. Dari analisis kimia produk flakes yang dihasilkan, ternyata substitusi tepung kacang merah dengan berbagai perbandingan seperti di atas meningkatkan kandungan vitamin C yaitu 0,337% (ubi kayu:kacang merah = 5:0); 0,421% (ubi kayu:kacang merah = 4:1); 0,511% (ubi kayu:kacang merah = 3:2); 0,594% (ubi kayu:tepung kacang merah = 2:3) dan 0,938% (tepung ubi kayu:tepung kacang merah = 1:4). Demikian juga kandungan protein meningkat dari 2,0560%; 3,0585%; 5,1568%; 6,9293%, dan 8,9874% sedangkan kenaikan kandungan lemak meningkat dari  7,7710%; 7,4141%; 9,9561%; 11,3675% dan 12,1673% untuk kandungan karbohidrat tertinggi pada perbandingan tepung ubi kayu:tepung kacang merah = 3:2 yaitu mencapai 51,1749%. Kandungan vitamin A mengalami penurunan dengan adanya substitusi kacang merah, kemudian naik lagi pada perbandingan tepung ubi kayu:tepung kacang merah = 3:2 yaitu mencapai 166 IU. Dari hasil uji hedonik didapat perbandingan tepung ubi kayu:tepung kacang merah = 3:2 menghasilkan produk flakes yang paling disukai baik dari segi aroma, warna, tekstur maupun rasanya.   Kata kunci: flakes
Identification of plankton species in ponds of Block O residence, Banguntapan, Bantul, Yogyakarta Sudarsono Sudarsono
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.82 KB) | DOI: 10.21831/jsd.v3i2.4140

Abstract

This research aims to identify the plankton species in the ponds of block O residence, Banguntapan, Bantul, Yogyakarta. The sample taken was accomplished by drawing 20 liters of water directly from the pond, then filtered it through the planktonnet. Field guide book of plankton identification was used to accomplish the next step, that is plankton species identification. The physicochemical condition, including temperature, turbidity, light intensity, and level of pH, were measured for every station given, and it was repeated 3 times. Shannon-Whiener equation was then used to calculate the index of diversity. This research concludes that the plankton species compositon of phytoplanton and zooplankton consist of 4 classes. They are Chlorophyceae (7 species), Cyanophyceae (7species), Bacillariophyceae (23 species), Euglenophyceae (4 species). From the total species of phytoplankton species found, around 54 species, at least 23 species are identified as the members of Bacillariophyceae, while the zooplanktons which were found in every stations consist of 4 classes, i.e. Copepod (1 species), Crustacean (2 species), Rotifer (5 species), and Protozoa (1 species). The total zooplankton species found is 10 species and 5 species of them belong to class Rotifer. The Diversity Indices on cathegoryzed in small to medium.   Key words: identification, plankton, Blok O.
The effect of voltage towards hydroxide magnesium yield through electrolysis system Fitria Fatichatul Hidayah
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.458 KB) | DOI: 10.21831/jsd.v3i2.4141

Abstract

Magnesium hidroksida mempunyai prospek dan manfaat sebagai bahan baku penyimpan gas hidrogen, bahan baku pembuatan magnesium oksida (MgO), dan obat maag. Magnesium dipisahkan berdasarkan metode elektrolisis. Hasilnya berupa magnesium hidroksida. Penelitian ini bertujuan untuk mengendapkan magnesium hidroksida melalui sistem elektrolisis dan menentukan pengaruh voltase terhadap rendemen hasil elektrolisis berupa Mg(OH)2. Sel elektrolisis terdiri dari 2-kompartemen, satu kompartemen berisi larutan Bittern di katoda dan kompartemen lain berisi larutan KOH pada anoda. Elektrolisis menggunakan tabung U yang disekat jembatan garam KCl, Elektroda berupa grafit dan potensial terpasang bervariasi mulai 3, 6, 9, dan 12 volt selama 120 menit. Magnesium hidroksida dikarakterisasi menggunakan spektrofotometer IR dan AAS. Penggunaan voltase terpasang 3 sampai 9 volt meningkatkan endapan Mg(OH)2 hasil elektrolisis tetapi pada voltase 12 volt terjadi penurunan endapan magnesium hidroksida.  Rendemen tertinggi yang dihasilkan pada penggunaan voltase sebesar 99,59%. Hasil analisis kadar Magnesium diperoleh 51,26%. Spektra IR Mg(OH)2 hasil elektrolisis dengan spektra IR Mg(OH)2 standar memiliki kemiripan bentuk spektra. Hal ini membuktikan bahwa endapan hasil elektrolisis merupakan Mg(OH)2. Kata kunci: voltase, bittern, elektrolisis, magnesium hidroksida
The potency of obtaining electrical energy from tofu industry liquid waste using salt bridge microbial fuel cell method Agustin Hermayanti; Irwan Nugraha
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.079 KB) | DOI: 10.21831/jsd.v3i2.4142

Abstract

Research on the acquisition of electric energy from waste water industry has been known using the so called salt bridge microbial fuel cell (SBMFC) method. MFC system (microbial fuel cell) is applied to tofu liquid waste management industry which generates two benefits that is reducing contamination of organic material and producing electricity. This study focused on the dual-chamber MFC system that comes as a salt bridge proton exchanger. Variation of the concentration of KMnO4 as an electrolyte solution is done to observe the effects on the acquisition of electrical energy. Changes in pH, COD, and BOD were also conducted to determine the effectiveness of the MFC in degrading wastewater of tofu. The results obtained in the form of electrical energy with a maximum power density of 11,941 mW/cm2 at concentration of 0.10 M. The pH value increase of KMnO4 occurred from 3.5 to 4.0 at concentration of 0.05 M KMnO4. Meanwhile the greatest decreases in COD values are 42.86% and 71.27%, respectively, at KMnO4 concentration of 0.10 M.   Key words: microbial fuel cell, dual-chamber, power density, electrical energy

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