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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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[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.

AIR FLOW VISUALIZATION AROUND THE FLIGHT FLIGHT WINGS Yosaphat Sumardi
Jurnal Penelitian Saintek Vol 8, No 2: Oktober 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research is performed with objectives: (I) to show the patterns of velocity field contour of airflow around the wings of subsonic plane, (2) to show factors that influence these patterns, and (3) to explain their application in flight engineering. The patterns of velocity field contour of airflow are visualized by using numerical method in Femlab software. Varying the velocity of airflow, the angle of attack, and the cross section form of wings shows the visualization of these patterns. The results of research show that the patterns of velocity field contour of airflow around the wings of subsonic plane may be circulation form. Factors that influence these patterns of contour are the velocity of airflow, the attack angle of wings, and the cross section form of wings. These three factors determine lift coefficient and dragcoefficient. In commercial flight it is used airfoil wings that areequipped by rear flaps on the trail edge of wings. These rear flaps canbe lowered of raised to adjust the cross section of airfoil. The slotsetting in the leading edge of wings can reduce the drag coefficient.Accordingly.fuel efficiency andflight safety can be controlled.

POTENTIAL LEAF CORN AS A SOURCE OF NATURAL DYES AND STABILITIES DURING DRYING POWDER USING BINDER MALTODEKSTRIN Sri Hardjanti
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Leaves katuk (Sauropus Androgynus- (L) Merr) is a leaf that can be used as a dye in food, but its use is less practical, therefore it is done by processing leaf katuk extracted and then made into powder. The research variables of katuk leaf powder were made with the addition of maltodectin at variation concentration 4%, 6%, 8%, and drying temperature 80 and 900C. The leaf powder obtained obtained katuk analyzed chemical properties (water content, chlorophyll content), physical properties (color, rehydration) and sensory properties (favorite level). The results showed that the addition of maltodextrin on katuk leaf extract powder tended to have no effect on physical properties (color and rehydration), chemical properties (moisture content, chlorophyll content) but more maltodextrin addition, leaf katuk leaf extract produced less favorable. The drying temperature of katuk leaf extract powder significantly influences chlorophyll content and color intensity on katuk leaf extract powder. The leaf extract powder of katuk is most preferable at 900 C drying temperature with the addition of 4% maltodextrin. Powder of katuk leaf extract has characteristics: water content 5.64% wb, chlorophyll content (0.83% db), Redness color 0.65, Yellowness 8.90, Blueness 2.75; rehydration 1.19 minutes.

MECHANICAL BEHAVIOR ANALYSIS OF FRUIT PONDOH DRUGS DURING THE METHOD WITH LIQTENSTEIGER MODEL PUMP Putu Sud ira
Jurnal Penelitian Saintek Vol 7, No 1: April 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed to analyze mechanical properties of SalakPondoh fruit on maturity periods through non-linear viscoelastics model from Lichtensteiger. Using a pneumatics impactor provided bypiezoelectric force sensor BK 8200 and acceleration sensor BK 4374, the histories of the impact forces and impact acceleration were recorded on microcomputer system. Thirty-three Salak Pondoh fruit with seven maturity levels were evaluated through impact impulse on one side. The deformation velocity and deformation level of Salak Pondoh fruit, due to impact were analyzed and differentiated from impact acceleration data. Using non-linear visco-elastical Lichtensteiger model, the mechanical properties of Salak Pondohfruit were analyzed quantitatively. The result of this study shows impact force, deformation, and deformation velocity histories were able to describefirmness and softness mechanical properties of Salak Pondoh quantitatively.

DETERMINING THE RESULTS OF RADIOISOTOPE PRODUCTIN DECY-13 CYCLOTRON FACILITY - Silakhudin
Jurnal Penelitian Saintek Vol 21, No 1: April 2016
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the results of radioisotope product in particular radioisotope of ﬂ uorine-18 at 13 MeV proton cyclotron facility. The calculation used a formulae of thick target yield on the nuclear reaction of 18 O(p,n) 18 F. This calculation is intended to ensure that the formulae and parameters used quite feasible for commissioning DECY-13 cyclotron. The calculation result has been compared with the radioisotope results of the cyclotrons in Dharmais and MRCCC Jakarta hospitals as well as the standards of the IAEA. The difference of results of calculation with comparison data is not more than 5%, which means that the calculation formulae is quite feasible for cyclotron commissioning. The calculation of ﬂ uorine-18 product using the formulae is 1223 mCi at 30 uA proton beam current of cyclotron operation and 40 minutes of irradiation.

SOLID KARBURISING PROCESS WITH COCONUT SHELL CULTURE MEDIA USED REINSTALLED IN LOW CARBON STEEL PACKING (PACK CARBURIZING PROCESS USING RECYCLING COCONUT SHELL CHARCOAL ON LOW CARBON STEEL HARDENING) Heri Wibowo; Arianto Leman Soemowidagdo
Jurnal Penelitian Saintek Vol 16, No 1: April 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Penelitian ini bertujuan untuk memperbaiki efisiensi proses karburising pada baja karbon rendah melalui pemakaian arang tempurung kelapa secara berulang sebagai karburiser. Arang tempurung kelapa dengan ukuran 30 mesh digunakan untuk lima kali proses karburising secara berulang. Benda uji dari baja karbon rendah diletakkan dalam kotak karburising dari pipa baja diameter 50 mm tebal dinding 2 mm. Tiap proses karburising padat dilakukan dalam dapur pemanas selama 4 jam. Pengaruh pemakaian arang tempurung kelapa secara berulang pada proses karburising padat dianalisis berdasar hasil uji kekerasan permukaan, case depth dan pengamatan struktur mikro. Case depth optimal setebal 300 urn terbentuk pada proses karburising menggunakan serbuk arang tempurung kelapa yang telah dipakai 2 kali proses. Arang tempurung kelapa masih layak digunakan sampai 4 kali proses karburising dengan kekerasan permukaan masih mencapai 642 VHN. Kata kunci: arang tempurung kalapa, karburising padat, baja karbon rendah

THE EFFECT of 4-METHOXYBENZALDEHYDe AND CYCLOHEXANONE MOLE RATIO VARIATION ON THE SYNTHESIS of 2-(4’-METHOXYBENZYLIDENE)CYCLOHEXANONE USING MICROWAVE ASSISTED ORGANIC SYNTHESIS METHODS Elga Riesta Puteri; Sri Handayani
Jurnal Penelitian Saintek Vol 22, No 1: April 2017
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aims to determine the effect of mole ratio variation and mole ratio which produce maximum yield. Synthesis of 2-(4’-methoxybenzylidene)cyclohexanone was done through Claissen Schmidt condensation with NaOH as catalyst. Variation of 4-methoxybenzaldehyde:cyclohexanone mole ratio were 1:1, 1:2, 1:4, 1:6, and 1:8. 2-(4’-methoxybenzylidene)cyclohexanone could be synthezied using MAOS methods for 120 seconds. Synthesis product was identified by TLC, TLC scan, spectroscopy IR, and spectroscopy 1H NMR. The result of this research showed that the variation of 4-methoxybenzaldehyde:cyclohexanone mole ratio had an effect on the synthesis of 2-(4’-methoxybenzylidene)cyclohexanone. It was proven by the different of yields which have been produced. Variation of 4-methoxybenzaldehyde:cyclohexanone mole ratio 1:1, 1:2, 1:4, 1:6, and 1:8 produced 2-(4’-methoxybenzylidene)cyclohexanone 0%; 59.272%; 64.122%; 46.782%; and 45.555% in yields respectively. The mole ratio of 4-methoxy-benzaldehyde:cyclohexanone which gives the maximum yield is 1:4.

TESTER KIT TO TEST BORAKS IN FOOD Regina Tutik Padmaningrum; Siti Mawarti
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Boraks digunakan sebagai pengenyal dan pengawet makanan mempunyai efek negatif terhadap kesehatan, sehingga perlu dikembangkan alat yang dapat menguji boraks dalam makanan secara sederhana, cepat, dan praktis. Penelitian ini bertujuan mengembangkan 2 tester kit berdasarkan reaksi kimia yang spesifik antara boraks dengan pereaksi tertentu, yaitu pereaksi barium klorida dan HCI-NaOH-manitol. Penelitian ini dilakukan menggunakan metode penelitian pengembangan. Model pengembangan yang digunakan adalah model prosedural. Pengembangan tester kit melalui beberapa tahap, yaitu: a) tahap perencanaan: pemilihan pereaksi yang spesifik secara teoritis (kajian teoritis), b) tahap pengorganisasian: uji coba reaksi antara larutan boraks dengan pereaksi spesifik dan penentuan komposisi stoikiometris antara pereaksi dengan boraks, c) tahap pelaksanaan: penyusunan tester kit, prosedur uji, keterangan fungsi tester, petunjuk keamanan dan cara penyimpanan. Tester kit yang dikembangkan terdiri atas a) seperangkat alat sederhana seperti botol bertutup dan pipet tetes, b) pereaksi kimia, c) prosedur uji, d) petunjuk keamanan, e) cara penyimpanan, batas deteksi, akurasi, dan f) keterangan fungsi tester kit.

THE EFFECT OF METALAXYL, FENAMIDONE, AND DIMETOMORF FUNGICIDE TOWARDS CONIDIA Peronosclerospora spp. ISOLATED FROM KLATEN Fajri Maulana Anugrah; Fitri Widiantini
Jurnal Penelitian Saintek Vol 23, No 1 (2018): April 2018
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the effect of three types of fungicide namely methaxyl, dimethomorph, and fenamidone to control downy mildew against conidia Peronosclerospora spp. in Klaten (Central Java). The study was carried out by conidia germination method and damage observation caused by the addition of fungicide to conidia. The results show that the fungicide treatment of methomorphic at a concentration of 10,000 ppm was still effective in inhibiting the development of downy mildew. It was shown by its ability to suppress the total germination of conidia Peronosclerospora spp. and causes 37.9% conidial damage. The use of fenamidone at a concentration of 8,000 ppm is able to inhibit conidia germination (0.34%), the lowest level of conidian damage detected is 8.54%. Meanwhile, metallaxill still has a good suppressive effect as indicated by the low conidia germination of 0.70% and conidial damage reaches up to 19.91%PENGARUH FUNGISIDA BERBAHAN AKTIF METALAKSIL, FENAMIDONE, DAN DIMETOMORF TERHADAP KONIDIA Peronosclerospora spp. ISOLAT KLATENPenelitian ini bertujuan untuk mengetahui pengaruh tiga jenis bahan aktif fungisida yang umum digunakan yaitu metalaksil, dimetomorf, dan fenamidon untuk mengendalikan penyakit bulai terhadap konidia Peronosclerospora spp. di Klaten (Jawa Tengah). Penelitian dilakukan dengan metode perkecambahan konidia dan mengamati kerusakan yang diakibatkan oleh penambahan fungisida terhadap konidia. Hasil penelitian menunjukkan bahwa perlakuan fungisida dimetomorf pada konsentrasi 10.000 ppm masih efektif menghambat perkembangan penyakit bulai yang ditunjukkan dengan kemampuannya menekan secara total perkecambahan konidia Peronosclerospora spp. dan menyebabkan kerusakan konidia sebesar 37,9%. Pengguunaan fenamidon pada konsentrasi 8.000 ppm dapat menghambat perkecambahan konidia (0,34%), tingkat kerusakan konidianya terdeteksi paling rendah yaitu sebesar 8,54%. Metalaksil masih memberikan efek penekanan yang baik yang ditunjukkan dengan rendahnya perkecambahan konidia yaitu sebesar 0,70% dan kerusakan konidia yang mencapai 19,91%.

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