Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Jurnal Penelitian Saintek

saintek
Website

Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 5 Documents

Search results for , issue "Vol 8, No 1: April 2003" : 5 Documents clear

DETERMINING ISOSBESTIC POINT AND DETERMINATION OF P-NITROFENOL COMPOUND by SPEKTROFOTOMETRI Heru Pratomo
Jurnal Penelitian Saintek Vol 8, No 1: April 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The determined of isosbestic point from weak acids or weak bases areusually important for indicator solutions. The indicators that used in acid-base titration have pH exactly, and this is usefulfor determine the end of titration. The aims of this research are (1) to determine ofwavelength on isosbestic point of p-nitro phenol, and (2) to determine of dissociation constant of p-nitro phenol. The determined of isosbestic has done with spectrophotometric method, to the p-nitro phenol solutions in several pH, at region of wavelength between 280 nm - 450 nm. In this research, indicate that the isosbestic point ofp-nitro phenol at the wavelength of 348 nm, and pH about 6.7. From this research also can be determined that the dissociation constant (KaYof p-nitro phenol is 6.48 x 10-8,not too different compared with K, literature, is7.08 x 10-8.

COEFFICIENT VALUE OF NUTRITIONAL FISH AND DIVERSITY PLANKTON LAKE RAWA PENING JAWA TENGAH Sukiya Sukiya
Jurnal Penelitian Saintek Vol 8, No 1: April 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The objective of the research is to investigate the nutrition vaLuecoefficient of fish and plankton diversity of Rawapening Lake due to pollutant from inlet water. Research was conducted in west, middle and south sides of the lake. The independent variable was the physicochemical quality of the water body, and the dependent one was the nutrition value coefficient of fish and plankton diversity. Samples were the mixture of 10 litres surface and 10 litres of two-meter deep' waterfor every station sampled. Temperature, clarity, total suspended solid and pH measured in situ. Microwinkler method was applied to measure alcalinity, DO and free CO2 in water body. Identification of plankton diversity used the book of Fresh Water Biology by Edmonson published in 1966 and Planktonology by Sachlan published in 1978, the nutrition value coefficient of fish was calculated using Fulton formula. Results show that 43 plankton and 16 necton species are investigated. Based on the coefficient of nutrition value it is concluded that Rawapening lake is consideredfeasiblefor nilafish (Oreochromys nilotica) to culture.

EFFECT OF ADDITION OF YEAST AND OLD TIME FERMENTATION TO VOLUME DONAT Endang Mulyatiningsih
Jurnal Penelitian Saintek Vol 8, No 1: April 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research is aimed at: 1) finding out the influence of increasing the amountof yeast and fermentation time to the volume oj doughnuts, 2) finding out the minimum amount of yeast effective in doughnut formula, and 3) finding out thelength of fermentation time ideal for each doughnut formula with different percentage of yeast. The research uses experimental approach took place in the laboratory of Food Science, Department of Family Welfare Education, Faculty of Technology, Yogyakarta State University. Variables involved in this research consist of independent variables, i.e. different amount of yeast 1.1 %, 1.63%, and2.2%; length of fermentation time 45', 60', 75', 90', 105', and 120'; and dependent variable of the volume of doughnuts, controlling variable of thevolume of doughnuts beforefermentation. The mixing of ingredients to make the dough uses the straight dough method The research is controlled by means of carefully scaling the ingredient using sartorial scale with the level of accuracy up to one milligram, standardizing the temperature while fermentation and measuring the volume using the landscape method and. the data are analyzed further by means of two-way Anava. When any difference is obtained, the advanced- test Anava is performed using Duncan's Multiple Range Test(DMRT). The result of the research shows that: 1) there is significant difference of the doughnut volume based on various amount of yeast and length of fermentation time; 2) 1.1% of yeast is still effective to enlarge the volume of doughnuts without any significant difference based on the analysis of DMRT on the three different formulations with 90-minutefermentation time, and thus the ideal fermentation time for the three formulation tested is 90 minutes because over 90 minutes the dough will have got over proofing.

[Tis012 (H20) 24] Cls.HCl.7H20 AS A SOURCE OF TITANIUM FOR PRE ARITH ZEOLITE TITANIUM SILlKA T (TS-l) Hari Sutrisno
Jurnal Penelitian Saintek Vol 8, No 1: April 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Titanium silicate of MFJ type (TS-J) has been synthesised by usingtetrapropyl ammonium hydroxide (TPAOH) as organic template, tetraethyl orthosilicate (TEOS) and [Ti80J] (H]O)uJCI8.HCI.7H]O as silicon and titanium source respectively by hydrothermal method, The' zeolites have been characterised by using various well-known techniques such as X-Ray Diffraction (XRD) with WinPlotr Program, Scanning Electron Microscopy (SEM) with Electron Diffraction (ED), IR and Raman spectroscopy. The zeolite of TS-J crystallises in the,orthorhombic system, space group Pnma, with a = 20.044 A;b = 19.929 A; c = J3.400 A; a = p = y = 90°. It has been changed bycalsination (TS-JC) in the monoklinik sytem, space group P2/n.J.J, with a = 20.068 A; b = J9.897 A; c = J 3.389 A, a = 90,024°; B r= 90°.

AN-AGRIC ANALYSIS ANALYSIS OF MAGNET MEDAN SENSOR MAKING MATERIAL WITH ION IMPLANTATION METHOD Edi Istiyono
Jurnal Penelitian Saintek Vol 8, No 1: April 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The national instrumental industries need support materials that have goodelectrical and magnetic properties. One is for sensor to measure magnetic field, i. e.: magnetic layer. The experiment is to find material for magneticlayer that has high GMR ratio requiredfor sensor. The sample is an Ag-Fe thin film produced by ion implantation: silver implanted with iron ions at various doses from 1.5 x 1017 ions/em' to 9.0 x 1017 ions/em' and energyfrom 40 ke V to 100 ke V GMR is determined by four-point probe method inmagneticfield Based on data analysis is conclused that: (1) Increasing of iron ions in Ag-Fe that produced by ion implantation causes decreasing of resistivity. Initially, increasing of annealing temperature causes decreasing of resistivity to minimum point, then the resistivity increases by increasing of annealing temperature; (2) Influence of ions dose, energy and annealing temperature to GMR:' (a) Initially, increasing of iron ions increases GMR ratio to the maximum point, then the GMR ratio decreases, (b) Increasing of the ion energy that is used the GMR ratio produced decreases and (c) Increasing of annealing temperature can rise GMR ratio; (3) Ag-Fe for ion. dose of 6. 0 x 1017 ions/em', energy of 100 ke)', and annealing temperatureat 300 'C has a minimum resistivity of (16.7 :f: 3) x 10.9 f2m and optimum of GMR ratio of 6.49%. Ag-Fe in the condition is a good material fot: magneticfield sensor; and (4) the curves of magnetoresistance are simetry and maximum resistance about magneticfield equal to zero.

Page 1 of 1 | Total Record : 5

Filter by Year

2003 2003

Filter By Issues

All Issue Vol 30, No 2 (2025) Vol 30, No 1 (2025) Vol 29, No 2 (2024) Vol 29, No 1 (2024) Vol 28, No 2 (2023) Vol 28, No 1 (2023) Vol 27, No 2 (2022) Vol 27, No 1 (2022) Vol 26, No 2 (2021) Vol 26, No 1 (2021) Vol 25, No 2 (2020) Vol 25, No 1 (2020) Vol 24, No 2: Oktober 2019 Vol 24, No 1: April 2019 Vol 23, No 1 (2018): April 2018 Vol 23, No 2: Oktober 2018 Vol 22, No 2: Oktober 2017 Vol 22, No 1: April 2017 Vol 21, No 2: Oktober 2016 Vol 21, No 1: April 2016 Vol 20, No 2: Oktober 2015 Vol 20, No 1: April 2015 Vol 19, No 2: Oktober 2014 Vol 19, No 1: April 2014 Vol 18, No 2: Oktober 2013 Vol 18, No 1: April 2013 Vol 17, No 1: April 2012 Vol 16, No 2: Oktober 2011 Vol 16, No 1: April 2011 Vol 15, No 2: Oktober 2010 Vol 15, No 1: April 2010 Vol 14, No 1: April 2009 Vol 13, No 1: April 2008 Vol 12, No 2: Oktober 2007 Vol 12, No 1: April 2007 Vol 11, No 1: April 2006 Vol 10, No 2: Oktober 2005 Vol 10, No 1: April 2005 Vol 9, No 1: April 2004 Vol 8, No 2: Oktober 2003 Vol 8, No 1: April 2003 Vol 7, No 2: Oktober 2002 Vol 7, No 1: April 2002 Vol 6, No 1: Saintek 2001 More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA