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Jurnal Sains Dasar

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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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Struktur morfologi, komposisi kimia dan resistansi lapisan TiO2- Cu sebagai lapisan aktif pada sel surya fotoelektrokimia Rita Prasetyowati; Marfuatun Marfuatun; Hadriansyah Ahmad
Jurnal Sains Dasar Vol 2, No 2 (2013): October 2013
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v2i2.4165

Peningkatan efisiensi sel surya titania terus dikembangkan. Salah satunya adalahmemodifikasi titania yang berfungsi sebagai lapisan aktif. Lapisan titania dapat disisipi denganlogam Cu. Penyisipan logam Cu pada TiO2 dilakukan melalui pembuatan nanokomposit TiO2-Cudengan metode sol-gel. Lapisan TiO2-Cu yang terbentuk dikarakterisasi dengan SEM (ScanningElectron Microscopy) untuk mengetahui struktur morfologi permukaan, EDX (Energy dispersiveX-ray spectroscopy) untuk mengetahui komposisi bahan. Sedangkan resistansi lapisan diukurmenggunakan Jembatan Wheatstone. Berdasarkan hasil SEM dapat ditunjukkan bahwa strukturmorfologi permukaan lapisan TiO2-Cu tidak berbeda secara signifikan dengan lapisan TiO2, yaitucukup homogen dan memiliki ukuran butir (grain) yang hampir sama. Tetapi dari hasil EDXdiperoleh bahwa lapisan TiO2-Cu yaitu lapisan TiO2 yang disisipi logam tembaga mengandungunsur Ti sebanyak 59,8%, unsur O sebanyak 40,02% dan unsur Cu sebanyak 0,19%. Sedangkanlapisan TiO2 saja mengandung unsur Ti sebanyak 54,25% dan unsur O sebanyak 45,75%.Penyisipan logam tembaga pada lapisan titania dapat menurunkan resistansi listrik lapisan. Nilairesistansi lapisan TiO2 adalah 7,714 kilo ohm. Sedangkan nilai resistansi lapisan TiO2-Cu adalah6,624 kilo ohm.Kata kunci: titania, logam Cu, morfologi, komposisi, resistansi

Estimating dynamic cattle population on palm oil plantation area in South Kalimantan Province) Adinata, Yudi; Pamungkas, Dicky; Krishna, Noor Hudhia; Aryogi, Aryogi
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Integration between beef cattle and palm oil plantation (animal plantation integration) should be supportedand developed. This study was carried out to estimate the dynamic cattle population managed by PT KAL.Estimating dynamic cattle population was counted by simulation base on population data, animal physiologicalstatus, and forage carrying capacity under palm oil plantation. The carrying capacity of available space is 2.066 ±199 animal unit (AU) and naturally would be reached in 2029-2030. Optimal capacity would be reached faster byintroducing new cattle in the population.Key words: integration, beef cattle, palm oil, dynamic cattle population

Formation of neural network models for time series data with intervention and its application in CPI data R. Kusumawati; D. U. Wutsqa; R. Subekti
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The purpose of this study is to get an optimal forecasting model of CPI data in Yogyakarta using neuralnetwork models that is built with the involvement of the intervention effect. This case happens because of the policyof rising fuel prices. CPI education, recreation, and sport have a pattern like a step function, so that the exact RNNmodels are the models with the input as the truncated polynomial spline regression models. The results of modelpredictions both training and testing data showed high accuracy. Key words: neural network, intervention, CPI

The usage of market vegetable waste in the production of electricity through microbial fuel cells Muhamad Imaduddin; Hermawan Hermawan; Hadiyan Hadiyan
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Keberadaan sampah sayur pasar begitu melimpah. Pemanfaatan sampah sayur salah satunya diolahmenjadi kompos. Hasil kompos mengalami kesulitan dalam pemasarannya sehingga hanya digunakan dalam skalakecil dan juga berdampak ke lingkungan seperti asidifikasi dan eutrofikasi. Di sisi lain, ancaman krisis energi danbahan bakar menjadikan kegiatan terkait dengan energi baru terbarukan menjadi sesuatu yang mendesak untuksegera dilakukan. Salah satu energi alternatif terbarukan ini adalah Microbial Fuel Cells . MFCs merupakan jenisutama dari bioelectrochemical system yang mengonversi biomassa secara spontan menjadi listrik melalui aktivitasmetabolisme mikroorganisme. Tujuan penelitian adalah menerapkan teknologi MFCs sebagai aplikasi sel voltadalam memproduksi listrik dengan substrat fase slurry sampah sayur. Variasi dilakukan pada perbandingan faseslurry yaitu 1:2; 1:1, dan 2:1 serta penambahan EM4. Pengoperasian reaktor dilakukan selama 21 hari. Voltaseyang dihasilkan paling besar pada reaktor R1+ (1:2 dan penambahan EM4) yaitu mencapai 1180 mV, arus listriksebesar 5,1 μA, dan daya listrik sebesar 6,02 mWatt, serta kerapatan daya sebesar 462,92 mWatt/m2. Keberadaanair pada MFCs berperan dalam mekanisme degradasi sampah sayur. Kecenderungan naiknya energi listrik yangdihasilkan pada awal pengoperasian reaktor menunjukkan adanya peningkatan sintesis seluler mikroorganisme.Penurunan energi listrik dipengaruhi pH lingkungan hidup mikroorganisme serta proses terbentuknya media lekatpada elektroda.Kata kunci: sampah sayur pasar, listrik, microbial fuel cells

The effects of giving “kecek”grasshopper(Orthoptera)stimulatorfrequencies of3000 Hz on teak (Tectona grandis)seeding and peanut(Arachis hypogeae, L) planting Anissa Yusi A’mallina; Juli Astono
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The purpose of this research is to know the effects of giving “kecek”grasshopper(Orthoptera)frequencies of 3000Hz in teak (Tectona grandis) seedingand peanut (Arachis hypogeae, L) plantingtowards the growth, wide openingof stomata, and plant productivity. The sound that used in this research is sound of “kecek”grasshopper(Orthoptera) with peak frequencies of the original sound is (4.3 ± 0.6) 103Hz and peak frequencies ofthe manipulated sound is(3,010 ± 14) Hz. Objects of this research areteak (Tectona grandis) seeds and peanuts(Arachis hypogeae, L). The resultsof thisresearch include: plant height, stem diameter, leaf length, leaf width,number of leaf, and yield of mass analyze using Microsoft Excel and Microsoft Origin 6.1, while to determinetheopening width of stomataOptilab Image Raster program was used.The results showed that the growth,productivity, and stomata width aperture of treatment plants arebetter than the control plants.Keywords: sound of “kecek”grasshopper(Orthoptera), teak (Tectona grandis), peanut (Arachis hypogeae, L),stimulator frequencies

MATHEMATIC MODEL FOR SITY BUS SCHEDULING IN YOGYAKARTA Sahid Sahid; Fitriana Yuli S; Dwi Lestari
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Various methods can be used to construct a mathematical model of the transportation problems. One model that can be used is a linear model. Several studies have used a linear model to get the schedule and the optimal route of bus trips. This research will build a mathematical model of a city bus transportation problems in DIY using linear models. Linear model is built to get the condition density city bus passengers on shifts respectively that morning, noon, and evening. After finding a suitable model, applied to the bus passengers data in Yogyakarta. From these results it can be seen the optimum conditions in terms of density, because the condition of the city bus at this time that quiet enthusiasts. Besides, the optimum density at each shift in the morning is 11 passengers, 10 passengers during the day, and evening 9 passengers. Keywords: transportation problems, the linear model, the optimal route, density

PRELIMINARY STUDY ON APPLICATION OF MAX PLUS ALGEBRA IN DISTRIBUTED STORAGE SYSTEM THROUGH NETWORK CODING Agus Maman Abadi; Musthofa Musthofa; Emut Emut
Jurnal Sains Dasar Vol 4, No 1 (2015): April 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The increasing need in techniques of storing big data presents a new challenge. One way to address this challenge is the use of distributed storage systems. One strategy that implemented in distributed data storage systems is the use of Erasure Code which applied to network coding. The code used in this technique is based on the algebraic structure which is called as vector space. Some studies have also been carried out to create code that is based on other algebraic structures such as module. In this study, we are going to try to set up a code based on the algebraic structure which is a generalization of the module that is semimodule by utilizing the max operations and sum operations at max plus algebra. The results of this study indicate that the max operation and the addition operation on max plus algebra cannot be used to establish a semimodule code, but by modifying the operation "+" as "min", we get a code based on semimodule. Keywords: code, distributed storage systems, network coding, semimodule, max plus algebra

RECOVERY OF GOLD (Au) AND SILVER (Ag) METALS IN THE ELECTRONIC WASTE THROUGH MULTILEVEL PRECIPITATION PROCESS Siti Marwati; Regina Tutik Padmaningrum; Sunarto Sunarto
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as CD-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process. The first step was the optimization of the concentration of thiourea and time dissolution of gold and silver in the sample. The concentration of thiourea and the time dissolution optimum obtained from conentration of gold and silver maximum. By The percent recovery of gold and silver are determined by comparing the concentration of gold and silver between in the solution sample and in the sample without dissolution that be analyzed by XRF. The scond step was the multilevel precipitation process and calcination. Precipitation and calcination of the filtrat was dissolution results in the optimum condition. Reagent used was a solution of hydrochloric acid and potassium carbonate. The precipitation gold and silver produced from the precipitation of dissolution again and then be analyzed by atomic absorption spectrophotometry. The purity was determined by comparing the weight of gold and silver between in the precipitate and in the solution. The results of this research showed that the percent recovery of the silver in the CD-RW through the process dissolution with thiourea 10 g/L and 4 hours soaking time were 21.09 %. The purity silver preipitate were 0.15 %. The percent recovery and the purity of gold can not be determined because the gold contained in the sample were not detected or below the limit of detection equipment. Keywords: recovery, gold, silver, electronic waste

DEVELOPMENT OF UV-BOX CONTROL SYTEM PROTOTYPE FOR STERILIZATION MEDIA USING PHOTODIODE SENSOR Laila Katriani; Denny Darmawan; Ahmad Awaluddin Noer
Jurnal Sains Dasar Vol 4, No 1 (2015): April 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

This research aims to design a UV box control system as sterilization media using photodiode sensor. The study began in June until November 2014. The study was conducted at the Laboratory of Electronics and Instrumentation, Department of Physics Education, State University of Yogyakarta. The design of the UV box control system consists of two stages, namely, the design of the hardware and software design. Hardware design consists of a power supply design, sensor design, comparator design, and a buzzer. Based on the results of tests that have been done shows the power supply voltage of 4.86 volts, the reference voltage of 3.76 volts, the comparator output voltage when low of 0.12 volts, the comparator output voltage when high of 3.0 volts. Keywords: UV-Box, Sterilization Media, photodiode

ANALYSIS OF RELATION TERM BETWEEN CUMMULATIVE PERFORMANCE INDEX AND SNMPTN DATA BASE USING APPRIORITY ALGORITHM Kuswari Hernawati; Nur Insani; Bambang Sumarno; Nurhadi Waryanto
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

In the university management, in addition to resources infrastructure, facilities and people, information systems is one of the resources that can be utilized to enhance the competitive advantage and provide accurate data for the benefit of policy makers, for example, information about the test scores SNMPTN, region of origin students, GPA student, students study duration. Yogyakarta State University to accept new students with an average of approximately 6,000 people annually, through the National Selection of State Universities Student (SNMPTN), SBMPTN (Joint Student Selection State University) and the Independent Selection exam (SM). With the increasing number of prospective students through SBMPTN, then increasingly also the basic data in a database of prospective students annually. By utilizing basic data on SBMPTN students and grade point average (GPA), the study aims to apply data mining techniques using the association rule Apriori algorithm to look for patterns of association between baseline SBMPTN and UNY students GPA. Basic data to be processed SBMPTN mining student data origin include school, home school district data, earnings data parent, parental education level data, the average value data UAN, and data values academic potential test (TPA). The results obtained are no data in the data base SNMPTN that significantly affect the acquisition of GPA. This is evident from the association rules derived from the 50 best asosoasi rules not seen the emergence of itemset GPA accompanied by the emergence of other itemset. Keywords: Data Mining, Association Rule, Algoritma Apriori, SNMPTN

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