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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 4 Documents

Search results for , issue "Vol 10, No 1: April 2005" : 4 Documents clear

MAKING MULTIPLE OF MULTI-POLY CULULOSE COMPOSITE POLYCULOSE FOR SEPARATION OF TEXTILE COLOR DYES Heru Pratomo
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this work is, to determine the role of supportcomposite polysuljone - cellulose acetate membrane in separating textile dyes. The subject is the textile dyes, and the object is dispersing textile dyes. The solution of the textile dyes (red, yellow and blue) made as wastewater from textile industry. It can be concluded that the support composite polysuljone - cellulose acetate membrane showed good permeability and high permsefectivity in separating textile dyes.

IMPROVED RATIO OF GERAM RESTRICTIONS AND REDUCTION OF PAHAT PAID WITH MODIFIED WEARS OF PAVING CUTS AT DVA MACHINE Didik Nurhadiyanto; Mujiyono Mujiyono
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research is aimed to determine the differences of chipcompression ratio and tool wear between a modified double cuttingtool and a standard cutting tool.The workpiece is made of VCN 150 with a dimension of e 1,75 inchand 200 mm long. Because the diameter of the blank is constant, the spindle rotation is set to 265 RPM Both cutters use the same coolant and have the same cutting angle. The properties to be varied are depth of cuts and feed Depth of cuts of standard cutting tool is formulated by the blank diameter substituted by the final diameter and than divided by two. The same formulation goes for depth of cuts of modified cutting tool. Tool wears and chip compression ratio values chosen is the biggest value on each cutting edge. Steps of this research one: Record the tool wear and chip compression ratio for each feed, which one 0,043; 0,066; 0,0875; and 0,/75 mmlrev while using depth of cuts of 0,5; I; 1,5 and 2 mm. Each treatment is done 5 times or each cutting stroke and the average is taken as a result. Comparing tool wear and chip compression ratio resulted from the utilization of modified cutting tool and standard tool.It can be concluded from the result of this research that (I) using modified cutting tool, there is an improvement of chip compression ratio equal to 6,74% compared to the standard cutter (2) using modified cutting tool there is a reduction tool wear equals to 14,53% compared the standard cutting /001.

SYNTHESIS DIBENZIL IS REGISTERED THROUGH THE POLYMERIZED POLYMERYLENE AS ALTERNATIVE RECYCLE PLASTIC RECYCLE Suwardi Suwardi; Crys Fajar Partana; Agus Salim
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Synthesis dibenzyl terephathalate were done through PET softdrinkbottles degradation by refluxing in benzyl alcohol at 14~C temperature for 20, 24. and 28 hours in the presence of zinc acetate catalyst. The result of degradation was purified by recristalization in methanol and then melting point (mp), FTIR, I H NMR spectra, and TLC spot were determined. The melting point of product degradation.for 28 hours was 98-99 "c. Based FTIR spectra known thatcompounds of product degradation have OH, C=O, C-O, CH,monosubstituted benzene, disubstituted benzene groups, while on IH NMR spectra showed chemical shift at 8.2 ppm (s, IO H of monosubtituted benzene), 7.5 ppm (s, 9 H consist of 4 H disubstituted benzene and 5 H of aromatic benzyl alcohol), 5.4 ppm (s, 1 H from OH benzyl alcohol), 4.8 ppm (s, 4 H of methylene), and 2.9 ppm (s. 7H of other traces). The single spot ofTLC plate indicated that productdegradation for 28 hours might be a single compound. Based these characterization concluded that compound of product degradation was dibenzyl terephthalate contains benzyl alcohol and other traces.

THIN COCONUT COMMOMOGRAPHY FOR DETERMINATION OF HEARTIDINE IN ORANGE OF ORANGE FROM ORANGE Sri Handayani; Sunarto Sunarto; Susila Kristianingrum
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research with the title Thin Layer Chromatography for Determination of Hesperidins Content in Orange Peel has been done in organic chemistry laboratory. The aim of this research is to select the solvent mix for the best hesperidins standard peak result and to determinate the content (in relative percentage) of some orange peel. Hesperidins isolation from orange peel conduct by soaks the orange peel piece in f 0% Calcium hydroxide solution for a night in room temperature. The mixture than jiltered and neutralized with hydrochloric acid to obtain hesperidins contain filtrate. Hesperidins analyzed by thin layer chromatography. Characterization of hesperidins did by compare the sample chromatogram with standard chromatogram. The yield (in relative percentage) determinate by compare the sample peak area with hesperidins standard peak area. The solvent mix selected before by attempt some solvent mix for eludate hesperidins standard solution. The result of this research shown that hesperidins can analyzed using thin layer chromatography method. with the best solvent was chloroform: methanol mixture (2 : 3). Hesperidins content in extract solution of some strain orange peel is; Baby Egypt 0, f 380%, Baby Pacitan 0,0615%, Mandarin Lokam 0,0018%, Santang 0,0049%, and Sunkist Nevel 0,0360%. The hesperidins content in orange peel of Mandarin Pakistan, Medan super, Nipis, Sunkist, Peras, and Purut was 0,0000. The hesperidins content in these orange peel was too low to be detected

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