Eko Hidayanto
Laboratorium Físika Material, Jurusan Físika, FMIPA- Universitas Diponegoro,Semarang

Published : 79 Documents
Articles

Aplikasi Portable Brix Meter untuk Pengukuran Indeks Bias Hidayanto, Eko; Rofiq, Abdul; Sugito, Heri
BERKALA FISIKA Vol 13, No 4 (2010): Berkala Fisika
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Abstract

Measurement of concentration of sucrose (C12H22O11) solution using Portable Brix Meter was analized to determine its refractive index using Abbe refractometer. The materials used are sucrose solution with a concentration of 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40%, and samples fruits of pear, watermelon, orange, apple and melon and others. The concentration of sucrose solution is proportional to the refractive index. The increase of concentration of sucrose solution will increase the refractive index. Correlation between the concentration of sucrose solution with refractive index is expressed by the equation Refractive index of sucrose solution can be determined from its concentration. Keywords:  sucrose solution, concentration, refractive index, portable brix meter
Quantitative Elemental Analysis of Alkaline Metals in Environmental Samples using Liquid Electrode Plasma Optical Emission Spectrometer Hidayanto, Eko; Yamamoto, Takashi; Kawai, Jun
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
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Abstract

Element in bottle drinking water, 100% orange juice and coffee and unknown element and concentration in environmental sample were quantitatively analyzed using a portable elemental analyzer of liquid electrode plasma optical emission spectrometer. In order to carry out this purpose, calibration of known element sample was firstly prepared by measuring its emission intensity in various concentrations. Sodium and potassium were commonly detected by this spectrometer, however other elements such as calcium and magnesium were not detected due to the minimum detection limit. The detected element by this portable analyzer shows that its accuracy is enough for quantitative analysis of environmental samples.
Respon Berbagai Bentuk, Ukuran dan Bahan Elektroda Pada Pengayaan Elektrolisis Tritium dalam Sampel Air Hidayanto, Eko; Tjahaja, Poppy Intan; Arif, Idam
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Abstract

Experiments were carried out to investigate the effects of various forms, sizes and materials of electrodes in the electrolytic enrichment for the determination of tritium concentration in water sample. Electrodes were made in several forms: square plate, cylinder and spiral. The electrolytic enrichment was carried out by conducting electric current to the electrodes in electrolytic cell at 150C filled with water sample, until the water volume is reduced to 10% from the initial volume. The concentrated water were then mixed with scintillate solution, and then counted using Liquid Scintillation Counter (LSC). The results show that the appropriate electrodes is nickel square plate with the recovery fraction and the enrichment factor respectively are 73.73% and 7.373
MEASUREMENT OF VISCOSITY AND SUCROSE CONCENTRATION IN AQUEOUS SOLUTION USING PORTABLE BRIX METER Hidayanto, Eko; Tanabe, Teruo; Kawai, Jun
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

The viscosity of aqueous sucrose solution in various concentrations and the sugar content were measured by using an Ostwald viscometer and a commercial available of portable Brix meter respectively. The increasing of the concentration of sucrose would also followed by increasing viscosity of the solution. Depending on their concentration, the measured value of viscosity of solution would be automatically confirmed into the desired concentration unit. The suitability of Brix meter for other application will be checked.
Analysis of Sodium, Potassium and Calcium using a Portable Liquid Electrode Plasma Optical Emission Spectrometer Hidayanto, Eko; Yamamoto, Takashi; Kawai, Jun
BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
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Abstract

Elements of sodium (Na), potassium (K) and calcium (Ca) in beverage samples and river water were analyzed with portable liquid electrode plasma - optical emission spectrometer (LEP-OES). The degree of reproducibility for emission intensities and individual variety of a disposal sample chip were investigated, and measuring conditions for quantitative analysis and the precision was discussed. The sensitivity for Na was higher than those for K and Ca by one or two orders of magnitude. Several ppm of Na and K, and several hundred of Ca in aqueous samples could be quantitatively analyzed with 2-30% of deviation without internal standard. The applied voltage was predominant factor for accurate quantitative analysis, and 800 V was found to be the best voltage estimation for quantitative analysis of alkaline metals contents.
Pengaruh Laju Molar Mn Larutan Terhadap Mikrostruktur Lapisan Tipis GaN:Mn yang Dideposisi di atas Substrat Si Menggunakan Metode Sol-Gel Sutanto, Heri; Hidayanto, Eko; Nurhasanah, Iis; Istadi, Istadi
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

A thin layer of material deposition of GaN: Mn by sol-gel method has done using spin-coating technique. Solution of gallium-citrate-amine maganese-Ga2O3 synthesized using as a source of Ga and Mn MnO2 as the source. Solution varied with the mole fraction solution of 60-80% Mn. Brown crystals that formed subsequently dissolved in ethylenediamine to form a gel. Subsequent gel superimposed on top of Si substrates with a spin-coater at a rate of 1100 rpm. Layers formed at temperatures of 900oC and then disintering in UHP N 2 gas environment to form the decomposition of GaN: Mn. The results of spectral analysis of energy dispersive X-ray (EDX) showed incorporation of Mn into the GaN mole fraction increased with the addition of a solution of Mn in the solution used. EDX Test results show that thin films of GaN: Mn impurity contained carbon (C) up to 36.71%. Image scanning electron microscopy (SEM) a thin layer of GaN: Mn shows in general have been obtained surface roughness (rms) morphology of the layer reaches the order of nanometers up to 24.36 nm. From the results already obtained show that the sol-gel deposition method has been able to produce a thin layer of magnetic semiconductors with a nearly homogeneous surface morphology. Thus the sol-gel method could be developed for alternative methods of deposition of thin layers that are economical and simple. Key words: GaN: Mn, CSD, Thin Layer, Mn incorporation.
Penentuan Kandungan Unsur Aluminium, Mangan dan Silikon dalam Air Sungai Code Terhadap Waktu Sampling dengan Metode AANC Hanim, Alfia; Azam, Much.; Hidayanto, Eko; Nuraini, Elin
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
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Abstract

An element determination which implied in river Code water below dr. Sardjito brigde with time variation was carried out using fast neutron analysis activation. Water river had been taken away from some dot later mixed, condensed by using an electrical stove from 500 ml to 7 ml. The sample then were iradiated by 14 MeV neutron from neutron generator and then were analyzed by gamma spectrometries.  The qualitative results shown that samples contents Al, Mn and Si. The quantitatively rate of element for aluminium is between 39,50-128,43 ppm, mangan between 71,54-182,80 and silicon between 19,12-84,53 ppm. Key words: FNAA, analysis element contents, Neutron Generator
Optimasi Elektroda Pada Sistem Pembangkit Plasma Non Termik untuk Meningkatkan Kuantitas Benih Mangrove Azam, Much.; Hidayanto, Eko
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
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Abstract

The Mangrove is the tropics  nature resources that has two aspects, economics and ecology. This plant can be  iradiated   by the corona discharge. It is need to radiate mangrove seed with nitrogen and analize it’s  growt.  For that have need optimations of the electrode on the non thermics plasma generator system  in order to get the effective and the efficient radiations.  The steps of the research are : analize system, make a prototype, test the prototype with simulations, compare  the simulations result with the experiment result and analize the results. From the research can get conclution that: 1) had been succes to make prototype of  the mangrove plant reproduction  system by the corona discharge plasma technology with the point-plant electrode, 2) the simulations result show that  electrical fields shall increase if the distance from electrode has been  decreases, or the voltage of electrode has been  incresed, or the distance among electrode has been decreased  or  the value of the electrode radius.has been opotimum, 3) the result of simulations show that the current density  shall  decrease if distance among electrode has been decreased, 4)for the same distance electrode, the electricel fields of the experiment results  is bigger than the simulations result, because the value of permeability and permittivity medium on the simulation is using the  value of    the vaccum  space.     Key words : the non thermics plasma, iradition, Mangrove
SIFAT ELEKTROOPTIS SEBAGAI PARAMETER INDIKASI MUTU BERBAGAI JENIS MINYAK GORENG KEMASAN Murni, Sri; Firdausi, K Sofjan; Hidayanto, Eko; Bawono P, Ari
BERKALA FISIKA Vol 15, No 4 (2012): Berkala Fisika
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Abstract

Abstract In this paper, we introduce the change of polarization angleβ induced by external electric field, as a quality indication of several edible oils without preliminary treatment. The averagevalue ofβ in the interval of applied potential difference plays important role as level of number offree radicals produced in the edible oils. The samples used were olive oil, extra olive oil, palm oil,and corn oil. Theβ value was obtained by measurement of the change polarization angle as the function of magnitude the electric field on the samples. The electric field was produced by DCvoltage power supply on two parallel plates in a separated distance of 2.5 cm and in area of 5 cm× 3 cm. The source of light used was He-Ne laser 1 mW (λ=633 nm). The experiment result showsthat for all the fresh frying oil samples the polarization angle has value between 2.3× 10/V and3.3× 10-4 0/V in the experimental condition. The extra olive oil has the smallest value while palmoil has the greatest. According to the previous study, the olive oil is relatively the best oil.Keywords: frying oil, electrooptics, polarization angle
EVALUASI KUALITAS BEBERAPA JENIS MINYAK GORENG KEMASAN SETELAH DIPANASKAN MENGGUNAKAN SIFAT ELEKTROOPTIS Murni, Sri; Bawono Putranto, Ari; Hidayanto, Eko; Firdausi, K Sofjan
BERKALA FISIKA Vol 16, No 3 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

In this report, we have determined the average value of polarization angle for various edible oils, before and after heating. The change of polarization angle was measured averagebetween potential differences 0-9 kV. The heating time for the samples was conducted up to 10 hours at average temperature by 180°C. The source of light was He-Ne Laser 1 mW (633 nm) with optical length of samples of 1 cm. In agreement to the previous experiment, our result shows that all vegetable oils provide increasing of free radicals indicated by increasing polarizationangle for longer heating time. For the heating time interval 0-10 hours, the level degradation ofoil rises quadratically. From various edible oils, olive oil is still the relative best quality from allsamples in this experiment. This method, once again, shows more powerful relative to otherstandard methods.Keywords: frying oil, electrooptics, polarization angle