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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 286 Documents

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MOBILE INTERNETBERBASIS A MULTICONALLY MOBILE PHONE FOR SUPPORTING E-LEARNING Herman Dwi Surjono; Eko Marpanaji; Suprapto Suprapto; Kadarisman Tejo Yuwono
Jurnal Penelitian Saintek Vol 16, No 1: April 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Penelitian ini bertujuan untuk mengkaji teknologi alternatif dalam mengembangkan sistem layanan akses Internet bergerak (mobile internet). Sistem yang diteliti adalah Mobile Internet Berbasis Telepon Seluler Multikoneksi (MIBTSM). MIBTSM menggunakan modem GSM/CDMA, dengan mengimplementasikan penyeimbangan beban sehingga menghasilkan Quality of Service (QoS) khususnya laju bit yang tinggi. Hasil penelitian berupa prototipe MIBTSM menggunakan Zeroshell dengan eksperimen konfigurasi dan implementasi penyeimbangan beban roundrobin atau failover. Hasil pengujian menunjukkan bahwa sistem dapat bekerja dengan baik. Koneksi Internet menggunakan 2 modem telepon seluler GSM dengan layanan Tsel Flash Corporate dimana laju bit masing-masing saat melakukan unduhan adalah 500 Kbps s.d. 700 Kbps. Sistem multikoneksi dengan penyeimbangan beban 2 modem tersebut menghasilkan laju bit saat melakukan unduhan sebesar 1 Mbps s.d. 1,5 Mbps. Kata kunci: mobile internet, modem GSM/CDMA, e-learning, penyeimbangan beban (load balancing).

ANTIBACTERIAL ACTIVITY OF ALOE VERA LEAF INFUSE [Aloe barbadensis Miller] Sulistyani, Nunung; Kurniati, Eni; Yakup, -; Cempaka, Risa Ayu
Jurnal Penelitian Saintek Vol 21, No 2: Oktober 2016
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this studi is to examine the antibacterial activity of aloe vera leaf infuse (Aloe barbadensis Miller) against human pathogens such as Pseudomonas aeroginosa, Salmonella typhi, Staphylococcus aureus, dan Streptococcus pneumonia. Antibacterial activity test of 20, 40, and 60% aloe vera leaf infuse was using agar well diffusion method. The antibacterial activity is indicated by the formation of a clear zone around the wells. All the concentration of aloe vera leaf infuse (Aloe barbadensis Miller) showed signiï¬ cant antibacterial activity against Pseudomonas aeroginosa, Salmonella typhi, Staphylococcus aureus, but did not show antibacterial activity against Streptococcus pneumonia. Aloe vera leaves infuse at a concentration of 60% can inhibit the growth of Pseudomonas aeroginosa indicated by the formation of a clear zone (16.5 mm), the bacteria Salmonella typhi (34 mm), and Staphylococcus aureus (15 mm). The research recommended aloe vera leaf would be suitable for use as antibacterial agent of disease caused by Pseudomonas aeroginosa, Salmonella typhi, and Staphylococcus aureus.Â

INFLUENCE OF REMELTING ON ALUMINUM ALUMINUM RAIN Aris Budiyono; Jamasri Jamasri
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this research is to observe the effect of remelting on fatigue crack growth rates of the aluminum alloys. The material used in this research was selected aluminum scraps. The material was melt and cast at temperature of 745°C in the metal molding, then was made specimen according to ASTM E. 647. The remelting was done three times at the same condition. The fatigue crack growth rate testing was performed in a room temperature condition with a constant load amplitude and the load ratio was maintained to be 0,3.The experiment result show that remelting can increase fatigue crack growth rates whichwas shown by increasing ofn exponential values (I" remelting was 4,4285 MFa.mo,s, 2nd4,5562 MFa.mo,s, and 3rd 4,6078 MFa.mo,5)Key words: remelting, fatigue crack growth rates, aluminum alloys

THE ANTIBACTERIAL ACTIVITY OF CURCUMA XANTHORRHIZA EXTRACT AGAINST ESCHERICHIA COLI ATCC 11229 AND STAPHYLOCOCCUS AUREUS ATCC 25923 Nur’Aini Purnamaningsih; Hadibah Kalor; Sri Atun
Jurnal Penelitian Saintek Vol 22, No 2: Oktober 2017
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The objective of this study were determining the antibacterial activity of Curcuma xanthorrhiza extract with various concentrations of 0,5 ppm, 5 ppm, 50 ppm, 250 ppm, and 500 ppm, and determining the effective concentrations of Curcuma extract antibacterial activity against Escherichia coli ATCC 11229 dan Staphylococcus aureus ATCC 25923. The results showed that the antibacterial activity of Curcuma xanthorrhiza extract with various concentrations of 0,5 ppm, 5 ppm, 50 ppm, 250 ppm, and 500 ppm showed antibacterial activity against Escherichia coli ATCC 11229 and Staphylococcus aureus ATCC 25923. The concentrations of Curcuma xanthorrhiza extract of 500 ppm effective against Escherichia coli ATCC 11229 which the diameter of inhibition by 10,37 mm and Staphylococcus aureus ATCC 25923 by 8,44 mm.

USE OF PRESIPITATION METHODS TO REDUCE Cu IN THE LIQUID WASTE INDUSTRY LIQUID IN KOTAGEDE Chanel Tri Handoko; Tri Budi Yanti; Halimatus Syadiyah; siti marwati
Jurnal Penelitian Saintek Vol 18, No 2: Oktober 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research was to determine the optimal pH decreased level of Cu using precipitation method and effectivity of the reduction Cu metal level using lime solution as precipitatingagent. The research was conducted by collecting the silver industrial wastewater samples from 3 different places, analyzing the initial Cu level, precipitation treatment of the sample, and analyzing the Cu level after precipitation process. Precipitation process was done by reacting the waste water sample and a solution of Ca(OH)2 0.2 M at pH variation of 7, 8, 9, 10, and 11, then allowed to settle for 24 hours. Then the optimal pH of the experiment was used as a pH in the precipitation process using 5% lime solution. Analysis of the Cu metal level in this study was using AAS instrument. Sample C has pH value =10.3 (alkaline), so no further precipitation process is carried out on sample C. Optimal pH precipitation to decresase Cu level is 8. Cu level after treatment precipitation using 5% lime solution at pH 8 is 0.6583 ppm for sample A and 0.4697 ppm for sample B. When compared with the initial Cu level it is 28132.7430 ppm for sample A and 11233.467 ppm for sample B, the precipitation method using lime solution effective to reduce Cu level.

THE APPEARANCE OF PHENOTYPIC CHARACTER ON FIVE GENOTYPES OF CAYENNE PEPPER Eva Oktaviani; Neni Rostini; Agung Karuniawan
Jurnal Penelitian Saintek Vol 23, No 2: Oktober 2018
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the appearance of phenotypic characters in five cayenne genotypes in Sukamantri, Ciamis Regency. The research method used was the experimental method with Randomized Block Design (RBD) with five treatments repeated five times. Data were analyzed by variance and followed by Least Significant Difference (LSD) Test. The testing material consisted of five genotypes of cayenne pepper, namely one of the new superior varieties (Ratuni Unpad), and four varieties (CR8873, Dewata, Taruna, and Rabani). The tests were carried out in Sukamantri, Ciamis Regency in 983 m asl in August 2017 to February 2018. The observations were made on the character of the results and components of results which included the seed length, the seed diameter, the seed weight per unit, the seed weight per plant, the seed weight per plot, and the seed weight per hectare. The test results showed that there were differences in phenotypic characters between the five genotypes tested. The Dewata, Ratuni Unpad, and CR8873 genotypes show the highest potential yield (8.34 tons/ha, 7.71 tons/ha, and 7.24), with the character of fruit weights per fruit of 1.382 grams, 0.911 grams respectively. and 1,311 grams.PENAMPILAN KARAKTER FENOTIPIK HASIL PADA LIMA GENOTIP CABAI RAWITPenelitian ini bertujuan untuk mengetahui penampilan karakter fenotipik pada lima genotip cabai rawit di Sukamantri, Kabupaten Ciamis. Metode penelitian yang digunakan adalah metode eksperimen dengan Rancangan Acak Kelompok (RAK) dengan lima perlakuan diulang lima kali. Data dianalisis dengan sidik ragam dan dilanjutkan dengan Uji Least Significant Difference (LSD). Bahan pengujian terdiri atas lima genotip cabai rawit, yaitu salah satu varietas unggul baru (Ratuni Unpad), dan empat varietas (CR8873, Dewata, Taruna, dan Rabani). Pengujian dilakukan di Sukamantri, Kabupaten Ciamis dengan ketinggian tempat 983 m di atas permukaan laut (dpl.) pada Agustus 2017 sampai Februari 2018. Pengamatan dilakukan terhadap karakter hasil dan komponen hasil yang meliputi panjang buah, diameter buah, bobot buah per buah, bobot buah per tanaman, bobot buah per plot, dan bobot buah per hektar.Hasil pengujian menunjukkan bahwa terdapat perbedaan karakter fenotipik antarlima genotip yang diuji. Genotip Dewata, Ratuni Unpad, dan CR8873 menampilkan potensi hasil yang tertinggi (8,34 ton/ha; 7,71 ton/ha; dan 7,24); dengan karakter bobot buah per buah masing-masing sebesar 1,382 gram; 0,911 gram; dan 1,311 gram.

BIOPLASTIK NATA DE CASSAVA AS MATERIAL EDIBLE FILM ENVIRONMENTALLY FRIENDLY Heru Pratomo; Eli Rohaeti
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aimed to synthesize friendly plastic by using waste. Waste from cassava is made nata with using acetobacter xylinum. Characterizations of bioplastics were functional groups using IR, thermal properties using Differential Thermal Analysis, crystallinity using X-Ray Diffractometry, mechanical properties i.e. strength at break and strain at break, surface observing by using Scanning Electron Microscopy and biodegradation test using activated sludge. The primary component of nata de cassava was cellulose polymer. That is showed by functional groups i.e. –OH free, C-H allifatic, C-O, structure of piran ring, and ȕ-1,4-glikosidik link. That cellulose is supported by XRD diffractogram for film, film of nata de cassava had crystalline phase 1D and 1E at 15° dan 22,5°. The pellicle of cellulose is also supported SEM photo. Nata de cassava was stable film thermally, is showed by 20% of mass loss at 400°C. The biodegradation caused breaking of ȕ-1,4-glikosidik link until cellulose molecule dissociated to glucose molecules.

RESPONSE OF TURMERIC SHOOT EXPLANT AFTER CYTOKININ WITH IN VITRO Marhan Nurullia; Erni Suminar Suminar; Anne Nurani
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the response of turmeric shoot explants after the provision of various types and concentrations of cytokinins in vitro. This experiment was conducted at the Tissue Culture Laboratory, Faculty of Agriculture, Padjadjaran University from January to April 2018. The data were analyzed using T-Test. The experimental method used in this research was Completely Randomized Design (CRD). Explant planting was carried out in Laminar Air Flow. The experiment consisted of 7 treatments consisting of 4 replications and each test consisted of 4 units. Observation of this experiment was carried out for 12 MST. The main observations were made on the data that were tested statistically namely the percentage of explant growing shoots, percentage of explant growing roots, shoot height, number of tuns, number of roots and root length. The treatments consisted of Control, 2.5 mg L-1 BAP, 5 mg L-1 BAP, 0.5 mg L-1 TDZ, 1 mg L-1 TDZ, 0.01 mg L-1 Zeatin and 0.1 mg L Zeatin -1. The results show that the treatment of 1 mg L-1 TDZ shows the best response to the growth of turmeric explants by increasing the number of turmeric shoot explants than the others.RESPONS EKSPLAN TUNAS KUNYIT SETELAH SITOKININ SECARA IN VITROTujuan dari penelitian ini yaitu untuk melihat respons eksplan tunas kunyit terhadap pemberian berbagai jenis dan konsentrasi sitokinin secara in vitro. Percobaan ini dilakukan di Laboratorium Kultur Jaringan, Fakultas Pertanian, Universitas Padjadjaran dari bulan Januari sampai April 2018. Hasil percobaan dianalisis dengan Sample T-Test. Metode percobaan yang digunakan dalam penelitian ini yaitu Rancangan Acak Lengkap (RAL). Penanaman eksplan dilakukan di dalam Laminar Air Flow. Percobaan terdiri dari 7 perlakuan sebanyak 4 ulangan dan setiap ulangan terdiri dari 4 unit. Pengamatan percobaan ini dilakukan selama 12 MST. Pengamatan utama dilakukan terhadap data-data yang diuji secara statistik yakni persentase eksplan tumbuh tunas, persentse eksplan tumbuh akar, tinggi tunas, jumlah tunas, jumlah akar dan panjang akar. Perlakuan terdiri dari Kontrol; 2,5 mg L-1 BAP; 5 mg L-1 BAP; 0,5 mg L-1 TDZ; 1 mg L-1 TDZ; 0,01 mg L-1 Zeatin; dan 0,1 mg L-1 Zeatin. Hasil penelitian menunjukkan bahwa perlakuan 1 mg L-1 TDZ menunjukkan respons yang lebih baik terhadap pertumbuhan eksplan kunyit dengan meningkatkan jumlah tunas eksplan tanaman kunyit daripada yang lainnya.

PLANT GROWTH RESPONSE ONLY (LACTUCA SATIVA L.) ON MEDIA USING VERMIKOMPOS WASTE CULTIVATION OF MUSHROOM CUSHION Suhartini Suhartini
Jurnal Penelitian Saintek Vol 12, No 2: Oktober 2007
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

'l7Iis research is done to know the influences of the maturity vemUcompost level of mushroom cultivated waste on the growth of se/ada, to know the influences of the combination between soil and vermicompost of mushroom cultivated waste on the growth of selada, to know the influences of interaction between vermicompost maturity level and the combination between soil and vermicompost on the growth of selada and to know what the vermicompost of mushroom cultivated waste can be used as organicfertiliser of seiada cultivation. This research is done to know the response of selada crop planted on dijJerentmaturation vermicompost media. The preparation that must be done before areproduce vermicompost and breeding of selada crop and analise ofvermicompost.The dependent variabel of this research is maturation vermicompostlevel (composted during 1month), half maturity (composted duringtwo months) and mature (composted during 3 months). The combination between soil and compost is 2:1, 3:1 and 4:1. The independent variabel is the growth of Selada that include wet weight (gram), high of crop (em), number of leaf (piece), and dry weight of crop (gram). The data of the research result of crop growth analysed using completly random design factorial. When there is a significant different continued with Duncan Multiple Range Test}. The quality of product examined by test quality of crop vegetable.Based on the research result can be concluded that the maturity vermicompost level of mushroom cultivated waste influences the cropgrowth by using of wet weight, dry weight, number of leaf and high of crop. The maturity vermicompost level give the significant different on all of the independent variable. The maturity level give the best growth. The comparation between soil and vermicompost 2:1; 3: 1; and 4:1; the 3:1 comparation gives the highst value for wet weight and d weight. .Whilefor. the high of crop and the number of leaf tZ c~mpartwn of SOli and vermicompost dont give the significant difJere~t. Ba~ed on that result the best use ofvermicompost is 3:1. There.ls n~t interaction between vermicompost maturity level and the combination between soil and vermicompost on the growth of selada. Based on the result of analise the vermicompost and the response of the growth of selada, so that the vermicompost of mushroom cultivated waste can be used as organicfertiliser ofselada.

POST-HEALTH EVALUATION BUILDING LINES AND ADMINISTRATION DEPARTMENT OF EDUCATION TECHNIQUE BUILDING FACULTY OF ENGINEERING UNY Bambang Sugestiyadi
Jurnal Penelitian Saintek Vol 7, No 2: Oktober 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The study of the post occupancy evaluation of the lecturing and administrationbuildings of the Department of the Construction Engineering Teacher Training of the Faculty of Technique of Yogyakarta State University is limited at the indicative level of the lecturing and administration buildings. It aims at investigating the technical and functional aspects of the lecturing and administration rooms of the Department of the Construction Engineering Teacher Training of the Faculty of Technique ofYogyakarta State University. It is conducted in 5 months of the lecturing period 199912000, with the analysis unit of the Department of the Construction Engineering with all of its activity aspects. The observing focuses of the study are a) the technical aspect, including: 1) lighting, 2) ventilation, 3) security, 4)fire fighting, 5) maintenance; b) the functional aspect, including: 1) room organization, 2) room capacity, 3) circulation, 4) communication, 5) the possibility to change. The data is collected using interview, field observation and documentation. The content validity is tested on relational judgmental basis. The results of the study show that in almost 50% of the lecturing period of the odd semester of 1999/2000 the lecturing room capacity is "less ", It is also found that the ideal and comfortable lecturing rooms are those with the capacity of 30-35 individuals per classroom. Based on the results of the study, it is necessary to consider the addition of the lecturing rooms with the "big" capacity of 100 individuals. And, based on the results of the evaluation of the capacity of the administration and lecturer rooms show that 90% of the capacity of the rooms do not meet the working room standard. The condition of the comfort and the security of the rooms do not meet the requirements. Based on the results of the study it is necessary to develop the administration and the lecturer rooms into a "vertical" direction that they meet the comfortable working room standard.

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