Articles

Tingkah Laku Akustik (Acoustic behaviour) Ikan Kerapu Macan (Epinephelus fuscoguttatus) Purnama Fitri, Aristi Dian; Asriyanto, Asriyanto; Sutanto, Heri
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 3 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Kerapu macan (Epinephelus fuscoguttatus) memproduksi suara selama melakukan berbagai aktivitas termasuk pada saat makan. Penelitian lebih mendalam untuk mengetahui apakah E. fuscoguttatus dapat merespons frekuensi suara disekelilingnya, belum pernah dilakukan. Tujuan penelitian adalah mengetahui karakteristik frekuensi suara E. fuscoguttatus dan mengetahui pola tingkah lakunya ketika mendeteksi sumber suara. Metode penelitian adalah eksperimental laboratories, dengan tahapan penelitian adalah mengetahui frekuensi dan intensitas suara E. fuscoguttatus saat makan, serta mengetahui pola tingkah laku E. fuscoguttatus saat adanya sumber suara. Acoustic behaviour  yang dihasilkan E. fuscoguttatus ketika makan adalah berkisar 16-32 Hz (58,9 dB) pada ratarata panjang total tubuh 100 mm dan berkisar 16-128 Hz (55,8 dB) dengan rata-rata panjang total tubuh 250 mm. Tidak adanya gelembung renang dan garis gurat sisi yang tidak terlihat jelas, menyebabkan E. fuscoguttatus tidak merespons sumber suara yang diberikan (sebagai atraktor) skala laboratorium. Kata kunci : Kerapu macan (Epinephelus fuscoguttatus), Acoustic behaviour    Grouper (Epinephelus fuscoguttatus) produced sound when conducting some activities including feeding. The objective of research was to determine the sound frequency characteristic of E. fuscoguttatus and to investigate known the behavior pattern when the fish detects source of sound. The method of research was experiment laboratories, with research step was known frequency and intensity of sound E. fuscoguttatus when feeding activity, and known behavior pattern E. fuscoguttatus when detecting of source of sound.  Acoustic behaviour  E. fuscoguttatus when feeding was range from 16-32 Hz (58.9 dB) at average on 100 mm TL and range from  16-128 Hz (55.8 dB) with average on 250 mm. E. fuscoguttatus didn’t had swim bladder and linea lateralis not distinct, caused E. fuscoguttatus didn’t response with  source sound (as attractor) in a  laboratory scale. Key words : Epinephelus fuscoguttatus, Acoustic behavior
PENUMBUHAN LAPISAN TIPIS SILIKON MIKROKRISTAL TERHIDROGENASI DENGAN TEKNIK HWC-VHF-PECVD Usman, Ida; Ismail, Darwin; Sutanto, Heri; Winata, Toto
REAKTOR Volume 13, Nomor 1, Juni 2010
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (851.711 KB) | DOI: 10.14710/reaktor.13.1.31-36

Abstract

Telah dikembangkan teknik HWC-VHF-PECVD (Hot Wire Cell Very High Frequency Plasma Enhanced Chemical Vapor Deposition) untuk menumbuhkan lapisan tipis silikon mikrokristal terhidrogenasi (mc-Si:H). Dari hasil penumbuhan lapisan tipis yang dilakukan, teknik HWC-VHF-PECVD memperlihatkan laju deposisi yang lebih tinggi dibandingkan laju deposisi lapisan tipis yang diperoleh dari teknik PECVD maupun teknik VHF-PECVD konvensional. Berdasarkan hasil pengukuran XRD dan SEM, lapisan yang diperoleh pada temperatur filamen yang rendah masih berstruktur amorf. Indikasi yang mengarah pada pembentukan lapisan tipis berstruktur mikrokristalin mulai terlihat pada temperatur filamen ≥ 500oC, dimana puncak-puncak di fraksi spektrum XRD untuk orientasi kristalin tertentu mulai terbentu, sejalan dengan pembentukan butiran-butiran kristalin dari hasil foto SEM permukaan lapisan-lapisan tersebut.
Mikrostruktur Semikonduktor GaN di Atas Substrat Silikon Dengan Metode Sol-Gel Sutanto, Heri; Nurhasanah, Iis; Istadi, Istadi; Maryanto, Maryanto; Ambikawati, Wahyu; Marlini, Nofi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Gallium nitride (GaN) semiconductor thin films have been successfully deposited on Si substrate (004) by sol-gel method. Gel prepared from the crystal gallium-citrate-amines. These crystals formed from a solution containing the ions Ga+3 and citric acid (CA). Gel in place on the substrate and then rotated with a speed of 1100 rpm. The gel layers are obtained and then placed on the programmable furnace. Deposition temperature varied of 800, 900 and 1000oC in a nitrogen gas environment during 2 hour. The crystal quality of GaN thin films have characterized by XRD measurement. The surface morphology and cross section of the films observed by SEM. The film compositions determined by EDX characterization. The results showed that all the GaN thin films on silicon substrate have oriented polycrystalline structure. The crystal quality of GaN film is formed is influenced by the deposition temperature. In a deposition temperature range is used, increasing the deposition temperature can improve the crystal quality of GaN films.   Keywords: GaN Thin Films; Spin-Coating Technique; Silicon Substrate
Rancang Bangun Deteksi Alkohol Pada Urine Dengan Sensor TGS 2620 Berbasis Mikrokontroler AT89S51 Sutanto, Heri; Haryowati, Anggraeni Dwi; Arifin, Zainal
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The design of alcohol detection in urine using sensors TGS 2620 microcontroller AT89S51 has been done. This device is made with a system that is simple and affordable prices so that it can be used for police and medical laboratories. Alcohol detection in urine is done by using sensors TGS 2620, ADC and the microcontroller. Measured values of the sensor are converted by the ADC and then processed microcontroller to be processed and sent to a computer with RS 232 modules. From the results of engineering manufacture alcohol detection devices in urine obtained test results showing that an increase in the value of sensor output voltage (VRL) at the time the sensor detects the presence of alcohol and research results of alcohol in urine is shown with captions positive or negative urine samples and the percentage content of alcohol .   Keywords: Alcohol, Urine, Sensors TGS 2620, Microcontroller AT89S51.
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
Publisher : 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.
Pengukuran Laju Paparan Radiasi Sinar-X Pada Ruang Operator RSUD. Prof. DR. W. Z. Johannes Kupang Leitabun, Yoel Midel; Sutanto, Heri; Anam, Choirul
YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Abstract

The measurement of X-ray radiation exposure rate in operator’s room with Pb glass at the Prof. Dr. W. Z. Johannes hospital, Kupang has been done. The measurement of radiation exposure rate for radiation before and after passing through the Pb glass was done using surveymeter. There are six points of measurement: at the upper-left, upper-right, upper-midle, bottom-left, bottom-right, and bottom-midle sides. The results of measurements show that Pb glass reduce the radiation exposure rate until 99,51%, and when flouroscopy is activated, the radiation exposure rate at the operator’s room is 0,6 mR/hour. This value is below the value of dose limit (NBD). Keywords: radiation exposure rate, Pb glass, radiaion at the operator’s room
DEPOSISI LAPISAN TIPIS ZINC OXIDE (ZnO) DI ATAS SUBSTRAT KACA DENGAN METODE SOL-GEL UNTUK APLIKASI DEGRADASI WARNA Pusvitasari, Marediyanti; Sutanto, Heri
YOUNGSTER PHYSICS JOURNAL Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : YOUNGSTER PHYSICS JOURNAL

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Abstract

ABSTRACT Zinc oxide (ZnO) thin films have been successfully deposited on glass substrates by spray coating method with a variety of the coating of volume about 10 ml to 50 ml. Then ZnO thin films used to degrade 10 ppm methylene blue dyes with sunlight as a medium. ZnO solution was synthesed by dissolving zinc acetate dehydrate (Zn (COOCH3) 2.2H2O into a solvent of isopropanol ((CH 3) 2CHOH) and monoethanolamine (MEA: HOCH2CH2NH2) at room temperature with a concentration of 0.3 M of zinc acetate and the molar ratio of MEA and ZnAc is 1:1. Then the solution was stirred by a magnetic stirrer at a temperature of 70 ° C for 30 minutes to obtain a clear and homogeneous solvent. Furthermore, gel of ZnO is placed on a spray hole and sprayed on a glass substrate that has been heated to a temperature of 250oC. This ZnO thin films then sintering at a temperature of 400oC for 1 hour. The ability of photocatalyst of ZnO for degradation of methylene blue color was observed through the elektrooptis measurement using polarisator and absorbance test using UV-Vis to obtain the percentage of color degradation. The test results of EDX showed that the ZnO thin film having an atomic composition of 50.27% Zn and 49.73% O. And the test results of elektrooptis showed that a thin film with volume coating of 50 ml, is the highest transmission intensity. This suggests that free radicals that more contained in the solvent. A high percentage of color degradation also obtained by stirring the solvent. Keywords: ZnO thin film, spray coating, Sol gel, color degradation
SINTESIS LAPISAN TIPIS NANOKOMPOSIT TiO2/CNT MENGGUNAKAN METODE SOL-GEL DAN APLIKASINYA UNTUK FOTODEGRADASI ZAT WARNA AZO ORANGE 3R Sakti, Rizky Bimanda; Subagio, Agus; Sutanto, Heri
YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Nanocomposite thin film of TiO2/CNT as a photocatalyst material was  synthesized using the sol-gel method with the dispersion of commercial TiO2 Merck in CNT. The crystal structure and nanocomposite thin film morfology of TiO2/CNT were characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Sol TiO2 0.3 M was mixed into the sol CNT with mass ratio of CNT:TiO2 was 1:5. Sol TiO2/CNT was sprayed on a glass substrate that was  heated at a temperature of 250 oC, then it was heated at the temperature of 450 °C for 60 minutes. Photodegradation was done by dipping the nanocomposite thin film of TiO2/CNT into 100 mL Azo Orange 3R dye sol 10 ppm, then was irradiated using UV light with a wavelength 380 nm. XRD pattern analysis showed that TiO2 has anatase structure with crystallite size at the range from 72-92 nm by using Scherrer equation. SEM image analysis showed that the grains of TiO2 sfreris pattern and was dispersed on CNT. Refluks TiO2/CNT nanocomposite thin film had been able to degrade Azo Orange 3R dye sol for 12 hours until percentage of 98,2% which was much better than the non reflux TiO2/CNT nanocomposite thin film as 97,2% and the TiO2 thin film as 90,9%. Keywords : TiO2, carbon nanotubes, thin film, nanocomposite, photodegradation, Azo Orange 3R dye.
SIFAT OPTIS LAPISAN ZnO:Ag YANG DIDEPOSISI DI ATAS SUBSTRAT KACA MENGGUNAKAN METODE CHEMICAL SOLUTION DEPOSITION (CSD) DAN APLIKASINYA PADA DEGRADASI ZAT WARNA METHYLENE BLUE Sistesya, Dilla; Sutanto, Heri
YOUNGSTER PHYSICS JOURNAL Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Abstract

ABSTRACTIn this research, ZnO:Ag thin films have been successfully deposited on glass substrates by spray coating technique with a variety of the doped of percent Ag about 2%, 3%, 4% dan 5%.. Optical properties ZnO:Ag thin films were characterized by using UV-Vis spectroscopy. Methylene blue as degradation media was used to estimate the photocatalytic activity from deposition samples ZnO:Ag . The research showed that silver doped in ZnO can enhance photocatalytic actifity because inhibite the recombination rate. In addition, higher concentration of ion doped, lower band gap energy making electron easily excitate. The result photocatalityc activity of ZnO:Ag able to degrade Methylene blue until 91,37%Keywords: Photocatalyst, Spray coating, ZnO:Ag, Band gap energy, Methylene blue.
STRUKTUR NANOKRISTAL CeO YANG DISINTESIS MENGGUNAKAN METODE PRESIPITASI DENGAN VARIASI LAMA WAKTU KALSINASI 2 Nursanti, Ida; Muhlisin, Zaenul; Sutanto, Heri; Nurhasanah, Iis
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Nanocrystalline CeO have been synthesized by using a precipitation method. in a mixedsolvent system of aqua DM and isopropanol. Precipited was calcined at temperature of 300 C forvarious calcination time.  X-ray difractometer was used to investigate resulting presipitedmicrostructure.  X-ray diffraction patterns were analyzed to study effect of calcination time tostructure and crystallite size. Refinement process of x-ray diffraction pattern was carried out byusing Rietveld method.  The results show that all of precipited were CeO  nanocrystalline withsingle phase of cubic fluorite.  The difference in lattice parameter was correlated to oxygenvacancy.  Crystallite size was found in the range 9 – 11 nm, its incresed as calcination timeincreased.   The increasing of calcination time did not significant influence to  crystallite size. These result indicated that CeO  nanocrystalline  exhibited weak-agglomeration.Keywords: CeO222, nanocrystalline, microstructure, x-ray diffraction, precipitation 2o