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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 9 Documents

Search results for , issue "Vol 20, No 1: April 2015" : 9 Documents clear

ACTIVITY AND SELECTIVITY OF Mo-Co/USY CATALYST ON THE HYDRODEOXYGENATION (HDO) REACTION OF ANISOLE Khoirina Dwi Nugrahaningtyas; Yuniawan Hidayat; Prima Susan Prayekti
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research was conducted to study the effect of the catalyst Mo-Co/USY againts product distribution and product conversion, and the effect of addition Co metals towards selectivity-products benzene on the anisole HDO. The anisole HDO was prepared by fl ow reactor. The products were analyzed by GC-MS. The main products of the anisole HDO i.e benzene and toluene. The activity with Mo-Co/USY catalyst higher than USY and termal. Mo-Co/USY B catalyst has highest selectivity-products benzene (15%).

THE EFFECT OF pH ON THE ADSORPTION OF MICRONUTRIENT CATIONS OF Ca 2+ AND K + BY SILICA FROM LAPINDO MUD Jaslin Ikhsan; Siti Sulastri; Erfan Priyambodo
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research was to determine the effect of pH on the adsorption of micronu- trients of Ca 2+ and K . by silica from lapindo mud. Data were collected by the adsorption experiments, on which 3 grams of silica separated from Lapindo mudwere dissolved in 300 mL of 0.0001 or 0.001 M Ca + 2+ or K ., and stirred for 2 hours. The pH of suspension was varied and left for equilibrate for 2 hours, and a sample was taken and measured for free concentration of K + + .cation using Flame Atomic Emission Spectroscopy and of Ca using Atomic Absorption Spectroscopy (AAS). The pH ranges were from 3 to 10. Temperature o 30 C and contact time of 2 hours were maintained. The research showed that both cations were adsorbed in sigmoid curve, increased with increasing pH values. In entire ranges of observed pH, the percentage of cations adsorbed by silica was not different signiﬁ cantly. The adsorbent of silica formed silanol (SiOH) in water. The –OH groups of silica were protonated forming SiOH o at lower pH and deprotonated forming SiO¯ at higher pH. Wether Ca 2+ or K + 2 + . cations were bound to silica surfacesvia cation exchange reactions, on which Ca2+ or K + . exchanged H of SiOH using one charge of the cations, forming [SiO(CaO)] for Ca 2+ , and [SiO-K] for K

EXAMINE ANTIBACTERIA ACTIVITY OF COMMERCIAL FERMENTED DAIRY PRODUCTS AGAINST PATHOGENS BACTERIA Nur Khikmah
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research was to examine antibacteria activity of commercial fermented dairy products against pathogens bacteria. The antibacteria activity was determined using the well diffusion method. The presence of antibacteria activity were shown by clear zone which formed around well containing fermented dairy products. The results show that yakult and probiotics yoghurt able to inhibit the growth of pathogens bacteria. The most sensitive pathogen bacteria to fermented dairy products was Salmonella thypii. Inhibition yakult and probiotics yoghurt against gram negative bacteria were greater than gram positive bacteria. Yakult containing Lactobacillus casei strain shirota was able to inhibit all pathogens bacteria, such as Salmonella thypii, Escherichia coli, Bacillus cereus, and Staphylococcus aureus.

FUEL CHARACTERIZATION ON DIESEL ENGINE Wardan Suyanto; Budi Tri Siswanto; Muhkamad Wakid
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aims to know the characteristics of: (1) fuel consumption on four stroke diesel engine in terms of the fuel injection timing variation in application of biosolar and Pertamina Dex, (2) emission opacity on four stroke diesel engine in terms of the fuel injection timing variation in application of biosolar and Pertamina Dex. This study used experimental approaches on four strokes single cylinder direct injection diesel engine with 4200 watts on maximum power. The engine speed and load were controlled by electricity load of electric AC generator. Observation was used to collect the data. The data was analyzed with mean calculation and showed with tables and graphics.The result of this study showed that: (1) the most efﬁ cient of fuel consumption is reached when injection timing in 30 before TDC (advanced) with biosolar, while in retreated condition is more uneconomical, (2) the least emission opacity is reached when injection timing in 30 O before TDC (advanced) with Pertamina Dex and worse in retreated condition.

DETERMINATION OF PHENOL IN WATER USING PHENOL SENSOR Aulia Ayuning Tyas; Zuhrotul Aini; Wulan Sekilas Wari
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of the research was to study the effect of ionophore concentration, membrane thickness, and pH solution in sensor performance and its application to sample. Method of the research used phenol sensor that can be made by coating Screen Printed Carbon Electrode (SPCE) with ionophore CTAPh (Cethyltrimethylammonium phenoxide) in chitosan membrane.This research used various ionophore concentration (0.5%; 1.0%; 1.5%; 2.0%; and 2.5%), membrane thickness (60µm, 80µm, 100µm, 110µm) and pH solution (9, 10, 11, 12). The research showed that the best phenol sensor performance at 1.5%, 60µm membrane thickness and pH solution 11. The research also showed that the best phenol sensor has 60 seconds response time, the Nernstian factor is 54.437mV/dekade, concentration range between 10-8-10-5 M (0,001-1ppm). Phenol sensor can be used to determine phenol in water which lower than limit detection of standard method.

SYNTHESIS GLYCEROL STEARATE OF STEARIC ACID WITH GLYCEROL BY PRODUCT OF BIODISEL FROM USED COOKING OIL Ika Rosdiani; Sri Atun
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research is to synthesis glycerol stearate compound from stearic acid with glycerol by product of biodiesel from used cooking oil, and to determine of product using IR and GC-MS spectroscopy. Method of the research was esterifi cation of glycerol and stearic acid with concentrated HCl as catalyst, by refl uct at 120-160 0C for 8 hours. The result was recrystallized by n hexan. The compound characterized by using IR spectroscopy and GC-MS spectroscopy. The compound has solid form, white to yellowish colour and has 58- 59 0C melting point value with rendement 80.53%. IR spectrum showed the presence C=O carbonil, C-O ester, -OH and C-H aliphatic group. The result of GC-MS analysis showed the compound which have synthesized has similarities with glycerol 2-monostearate with similarity index (SI) of 88% with a purity of 98,94%.

ANALYSIS OFTHIOCYANATE ON URINE AS MONITORING METHOD OF POTENTIAL GAKI (IODINE DEFICIENCY DISORDERS) BASED ON TEST KIT Yulia Dwi Cahyani; Mike Nur Izzati; M Dzulfahmi Ramadhan
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of the researh is to analyse of thiocyanate on urine. In this research, thiocyanate is oxidized by hypochlorite to cyanide that can react with ninhydrin to form a red complex compound called hydrindantin. The color intensity of red hydrindantin is proprotional to thiocyanate concentration. The higher thiocyanate concentration then the higher color intensity is. The optimum condition to form hydrindantin, such as pH, concentration of hypochlorite, and time stability of hydrindantin formation was studied using spectrophotometry at maximum wavelength of 489.50nm. The optimum condition for hydrindantin complex were pH of 10, concentration of hypochlorite of 0.05M, and the time stability of hydrindatin is 15 minutes. The proposed test kit can be used to determine thiocyanate concentration at range of 1-10ppm. The test kit has been applied to synthetic sample and urine, also compared the result to those obtained from standard spectrophotometric method to based formation of complex Fe(SCN)2+.

A STUDY ON THE HAZARD OF ERUPTION AND LANDSLIDE IN INTERVOLCANIC BASIN OF MERAPI-MERBABU CENTRAL JAVA Nurhadi Nurhadi; Arif Ashari; Suparmini Suparmini
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aimed to: (1) assess the eruption and landslide hazard, and (2) create a map of the spatial distribution of hazard in intervolcanic basin of the Merapi-Merbabu, Central Java Province. The method employs in this research was exploratory surveys, with regional complex approach. The population in this study were all landscape phenomena between intervolcanic basin of Merapi-Merbabu, located in parts of sub-district Sawangan, Magelang District, and sub-district Selo, Boyolali District. Sample was determined by observation of purposive sampling technique that at each terrain unit. Data collecting was carried out with observation, interpretation of remote sensing imagery, literature review, and documentation. The analysis used GIS analysis, scoring analysis, supported by descriptive analysis. The results showed the hazard of volcanic eruption varies between moderate to high. Moderate hazard exist in the area of Merbabu Volcano, while high hazard exist in the area of Merapi Volcano. High hazard mainly affected by high level of distance from active crater of Merapi Volcano and slope. The landslide hazard varies between very low to moderate. Very low and low hazard exist in the area of Merapi Volcano, while moderate hazard exist in the area of Merbabu Volcano. Moderate hazard mainly affected by high level of slope, soil texture, soil depth, and vegetation density.

SUITABILITY EVALUATION OF TEUPIN LAYEU IBOIH BEACH AS THE LOCATION OF MARINE ECOTOURISM Dian Aswita; M. Ali Sarong; Sugianto Sugianto
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Teupin Layeu Iboih beach is one of the tourist locations in Sabang City and is one of the locations for marine tourism was developed from mass tourism to ecotourism. This research aimed to assess the suitability of Teupin Layeu Iboih beach as the location of marine ecotourism was carried out from March to June 2014. A descriptive approach was applied by using survey and fi eld observations. The parameters collected are the type of coral reefs, the coral fi sh species, the water depth, the water transparency, the type of beach, the coastal land cover, the bottom material, and the distance of freshwater availability from the beach. Research showed that Teupin Layeu Iboih beach is suitable for marine ecotourism as a recreational area with a value of 73% and very suitable for diving and snorkeling with a value of 86.7%.

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