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Quantitative Analysis of Liquid by Quick Freezing Into Ice Using Nd-YAG Laser-Induced Atmospheric Plasma Yulianto Ichwan, Mohamad Infrawan; Suyanto, Hery; Suliyanti, Maria Margaretha; Hedwig, Rinda; Pardede, Marincan; Kagawa, Kiichiro; Lie, Tjung Jie; Kurniawan, Koo Hendrik
Journal of Engineering and Technological Sciences Vol 37, No 1 (2005)
Publisher : ITB Journal Publisher, LPPM ITB

A new approach of quantitative analysis of liquid sample using laser ablation technique was developed. The liquid was immediately freezed using the mixture of dry ice and alcohol in weight ratio of 95% : 5%. As a result, an increase of the repulsion force from the sample surface will enable the generation of the laser-induced shock wave plasma which was difficult to carry out on liquid surface. The ice sample was then irradiated using Nd-YAG laser operated in its fundamental wavelength. In order to increase the signal to background ratio and to obtain a sharp atomic line spectra, helium gas was used instead of air. Dynamic characterization of the spatially integrated time profile of the Cu I 521.8 nm, Cu I 510.5 nm and HÎ± lines shows a shock excitation stage and cooling stage which is corresponded to our shock wave model even when the plasma was generated under atmospheric gas pressure. Further study of the time profile averaged temperature of the atmospheric plasma also shows an increase of temperature during the shock excitation stage followed by diminution of temperature during the cooling stage. An application of this technique was then applied to quantitative analysis of several liquid samples. A linear calibration curve which intercept at 0 point was obtained for all of the elements investigated in this study such as sodium, potassium, lithium, copper, silver, lead and aluminum. A detection limit of around 1 ppm was found for the above element. This new technique will contribute to a great extent of laser atomic emission spectrochemical analysis for liquid samples.

PERHITUNGAN TEMPERATUR PLASMA-LASER DENGAN METODE PERBANDINGAN INTENSITAS DUA GARIS EMISI ZINC (Zn) Suyanto, Hery
Telaah Vol 32, No 2 (2014)
Publisher : Research Center for Physics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/tel.32.2.180

Telah dilakukan perhitungan temperatur plasma-laser dengan persamaan Boltzmann melalui metode perbandingan (rasio) intensitas emisi dua panjang gelombang dari atom netral zinc (Zn). Tujuan penelitian ini untuk memilih pasangan panjang gelombang yang mempunyai nilai temperatur dapat mewakili temperatur plasma zinc di sekitar waktu eksitasi plasma. Intensitas diperoleh dengan memfokuskan laser Nd-YAG (1064 nm, 7 ns) dengan energi 80 mJ ke permukaan lempengan sampel Zn (99.99%) di lingkungan udara 1 atm dan menghasilkan plasma. Intensitas-intensitas emisi foton atom netral Zn dalam plasma ditangkap oleh spektrometer yang mana memungkinkan dapat dibuat 5 kombinasi rasio intensitas emisi dua panjang gelombang yang memenuhi syarat Boltzmann. Dengan memvariasikan waktu tunda deteksi diperoleh data intensitas yang menunjukkan bahwa daerah eksitasi (shock-excitation state) terjadi di sekitar 5 ns. Berdasarkan persamaan Boltzmann dan dengan membandingan nilai intensitas dua panjang gelombang dari lima kombinasi atom netral Zn diperoleh temperatur rata-rata pada daerah eksitasi sebesar 3064 K, dengan rentang kesalahan maksimum 6%. Berdasarkan data dapat disimpulkan bahwa rasio (328.2 nm/472.2 nm) ini merupakan rasio pasangan dua panjang gelombang yang paling cocok untuk menentukan temperatur plasma atom Zn dengan kesalahan maksimum 1.68% dari nilai rata-rata temperatur.

Analisis Korosifitas Baja Ringan dengan Metoda Laser Induced Breakdown Spectroscopy (LIBS) Siti Raudatul Jannah; Ni Nyoman Ratini; Windarjoto Windarjoto; Hery Suyanto
Kappa Journal Vol 5 No 1 (2021): Juni
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v5i1.3446

Method has been carried out. Research is done on mild steel zincalume type with immersion treatment (NaCl 3.5%) for 10 days, and 30 days and without immersion. Mild steel is laser irradiated (Nd-YAG 1064 nm, 7 ns) with energy of 120 mJ, and the data is taken with an accumulation of 3, delay time of 0.5 µs. Elements identification is done by taking data from up to 75 Î¼m from the surface. The results of the analysis with LIBS showed immersion for 10 days, the corrosion rate and hardness of mild steel increased with 30 days immersion. The increase in the corrosion rate of mild steel is indicated by decreasing the value of dissolved oxygen intensity, the electrochemical reaction is fast. The decrease in the corrosion rate is indicated by the increase in the intensity value of Zn and Al elements associated with the formation of a passive film on the metal surface as a protective layer to protect further corrosion attacks.DOI : 10.29408/kpj.v5i1.3446

PREPARATION, CHARACTERIZATION AND USED OF POLYSULFONE MEMBRANES FOR THE TREATMENT OF WATER SOLUTIONS CONTAINING HUMIC ACIDS Ni Nyoman Rupiasih; Made Sumadiyasa; A.A. Ratnawati; Hery Suyanto
Jurnal Sains Materi Indonesia VOL 13, NO 1: OKTOBER 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PREPARATION, CHARACTERIZATION AND USED OF POLYSULFONE MEMBRANES FOR THE TREATMENT OF WATER SOLUTIONS CONTAINING HUMIC ACIDS. Polysulfone (PSf) membranes were cast by phase inversion method using PSf as matrix, N,N-Dimethylacetamide (DMAc) as solvent and distilled water as coagulant. The microporous membrane has studied using Scanning Electron Microscope (SEM) and filtration techniques. The filtration experiments were performed on a flat sheet membrane using pure water and humic acids (HA) solution as feeds. The results show, the Pure Water Flux (PWF) and Product Flux (PF) values decrease with increasing thickness of the membranes. They are consistent with the SEM images that thicker membranes have smaller pore size and less in numbers. The Rejection coefficient (R) values showthat the membranes are able to filter HA in the form of solution, with the performance dependent on the characteristics: thickness and microporous structure. They were increased with increase in the thickness of the membranes and with increase in the wavelength from 250-665 nm. It suggests that, the PSf membranes can be used to minimize the amount of Humic Acids from water process to improve the quality of treated to an acceptable quality level.

Quantitative Analysis of Liquid by Quick Freezing Into Ice Using Nd-YAG Laser-Induced Atmospheric Plasma Mohamad Infrawan Yulianto Ichwan; Hery Suyanto; Maria Margaretha Suliyanti; Rinda Hedwig; Marincan Pardede; Kiichiro Kagawa; Tjung Jie Lie; Koo Hendrik Kurniawan
Journal of Engineering and Technological Sciences Vol. 37 No. 1 (2005)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2005.37.1.4

A new approach of quantitative analysis of liquid sample using laser ablation technique was developed. The liquid was immediately freezed using the mixture of dry ice and alcohol in weight ratio of 95% : 5%. As a result, an increase of the repulsion force from the sample surface will enable the generation of the laser-induced shock wave plasma which was difficult to carry out on liquid surface. The ice sample was then irradiated using Nd-YAG laser operated in its fundamental wavelength. In order to increase the signal to background ratio and to obtain a sharp atomic line spectra, helium gas was used instead of air. Dynamic characterization of the spatially integrated time profile of the Cu I 521.8 nm, Cu I 510.5 nm and HÎ± lines shows a shock excitation stage and cooling stage which is corresponded to our shock wave model even when the plasma was generated under atmospheric gas pressure. Further study of the time profile averaged temperature of the atmospheric plasma also shows an increase of temperature during the shock excitation stage followed by diminution of temperature during the cooling stage. An application of this technique was then applied to quantitative analysis of several liquid samples. A linear calibration curve which intercept at 0 point was obtained for all of the elements investigated in this study such as sodium, potassium, lithium, copper, silver, lead and aluminum. A detection limit of around 1 ppm was found for the above element. This new technique will contribute to a great extent of laser atomic emission spectrochemical analysis for liquid samples.

ANALISIS LOGAM Cd (II) DENGAN METODE VOLTAMETRI PELUCUTAN ANODIK MENGGUNAKAN ELEKTRODA PASTA KARBON TERMODIFIKASI ZEOLIT ALAM Irdhawati Irdhawati; Ni Ketut Esati; Hery Suyanto
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 4 No 2 (2016)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (557.135 KB)

Pada penelitian ini telah dipelajari material zeolit alam teraktivasi asam sulfat 0,1 M yang digunakan sebagai modifier dalam elektroda kerja pasta karbon (EPK). Kinerja EPK termodifikasi zeolit alam teraktivasi asam (EPKZA) dibandingkan dengan EPK tanpa modifier dan penerapannya dalam penentuan kadar logam Cd(II) dalam sampel sayur dengan metode voltametri pelucutan anodik. Parameter optimasi yang diuji meliputi waktu deposisi dan laju pindai pada EPK dan EPKZA, serta komposisi zeolit dalam EPKZA. Komposisi elektroda kerja terbaik pada kondisi optimum pengukuran digunakan untuk menentukan rentang konsentrasi linier, limit deteksi, ketelitian, dan ketepatan penentuan logam Cd(II). Hasil yang diperoleh yaitu waktu deposisi 630 detikdan laju pindai 10 mV/s menggunakan EPK, dan komposisi modifier terbaik sebesar 5% dalam EPKZA, dengan waktu deposisi 540 detik dan laju pindai 20 mV/s. Rentang konsentrasi pengukuran EPKZA lebih luas yaitu dari 50-2000 ppb, sedangkan EPK tanpa modifier hanya memiliki rentang konsentrasi dari 100-1000 ppb. EPKZA dapat mengukur logam dengan konsentrasi yang lebih rendah dari EPK tanpa modifier, dengan batas deteksi pengukuran EPKZA adalah 58,41 ppb, sedangkan batas deteksi pengukuran EPK tanpa modifier sebesar 94,38 ppb. Keberulangan pengukuran larutan standar logamCd(II) dengan EPKZA menghasilkan nilai HorRat yang lebih kecil dari dua, serta nilai persen perolehan kembali sebesar 99,28±3,12 %, sehingga metode ini memiliki keseksamaan dan akurasi yang sangat baik. In this research the natural zeolite material activated by 0.1 M sulfuric acid was used as a modifier for carbon paste electrode (CPE). The performance of CPE modified by acid activated natural zeolite (CPEZ) was compared with CPE without modifier one and applied in the determination of Cd(II) concentration in vegetable samples using anodic stripping voltammetry method. The observed parameters includes deposition time and scan rate at CPE and CPEZ, and composition of modifier in CPEZ. The optimum composition and measurement condition of working electrode was used for determination linear range concentration, limit of detection, repeatability, and percent recovery. The result shows that the optimum deposition time are 630 s and 540 s, and scan rates are 10 mV/s and 20 mV/s for CPE and CPEZ respectively with the modifier concentration of 5%. The linear range concentration for CPEZ observed at 50-2000 ppb has wider range than CPE which was 100-1000 ppb. Limit of detection of CPEZ of 58.41 ppb is lower than CPE of 94.38 ppb. Determination of repeatability measurement of Cd(II) solution has HorRat value less than two, and percent recovery is 99.28+3.12%. Therefore, this method has a very good precision and accuracy.

Identifikasi Unsur Utama Penyusun Permukaan Bahan Baja Ringan dengan Laser-Induced Breakdown Spectroscopy (LIBS) Hery Suyanto
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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AbstrakIdentifikasi unsur utama penyusun permukaan bahan baja ringan telah dianalisis denganmenggunakan teknik laser-induced breakdown spectroscopy (LIBS). Identifikasi unsurdilakukan dengan pengambilan data setiap kedalaman 20 ?m hingga kedalaman 120 ?m daripermukaan yang mana disebut metode depth profile dengan meninjau homogenitas suatuunsur fungsi kedalaman. Data menunjukan ada tiga kelompok unsur penyusun permukaan(20–120 ?m) bahan baja ringan. Kelompok pertama, unsur Aluminium (Al) dan Zinc (Zn) yangmempunyai tingkat homogen tinggi sampai kedalaman 120 ?m dengan fluktuasi kurang dari 8% dan rata-rata konsentrasi masing-masing lebih besar dari 40,5%, sehingga unsur inimerupakan penyusun utama permukaan baja ringan. Kelompok kedua, unsur krom (Cr),Natrium (Na) dan kalsium (Ca) merupakan unsur penyusun dipermukaan hingga kedalaman 20?m dengan rata-rata konsentrasi masing-masing sebesar 3,9%. Kelompok ketiga yaitu unsurFe merupakan unsur penyusun baja ringan yang konsentrasinya meningkat denganbertambahnya kedalaman dan mulai homogen setelah kedalaman 100 ?m dengan rata-ratakonsentrasi sebesar 7.2 %.Kata kunci: Identifikasi unsur, baja ringan, LIBS, depth profile, homogenitas.AbstractThe identification of the main elements in the surface of steel was conducted by applying depthprofile method using Laser-Induced Breakdown spectroscopy (LIBS). The investigation basedon the homogenous of the elements as a function of the depth started from the surface till 120?m. The data show that there are three groups of the elements constructed in the surface ofsteel. The first group, alumina (Al) and Zinc (Zn), is host elements in the surface till 120 ?mwith a concentration more than 40.5 % of each and fluctuation is less than 8 %. The nextgroup, chromium (Cr), sodium (Na) and calcium (Ca) elements, is in the surface of steel till 20?m with average concentration of each is 3.9 %. The last group is iron (Fe) element where itsconcentration rises with the increasing of the depth till 100 ?m and its average concentration isabout 7.2 %.Keywords: Surface analysis, LIBS, depth profile, homogeneous.

INFLUENCE OF LIGHT WAVELENGTHS ON GROWTH OF TOMATO Hery Suyanto; Ni Nyoman Rupiasih; Dewi Handayani
Bumi Lestari Journal of Environment Vol 12 No 2 (2012)
Publisher : Environmental Research Center (PPLH) of Udayana University

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Telah dilakukan penelitian tentang pengaruh panjang gelombang cahaya terhadap lajupertumbuhan dan karakteristik klorofil-a pada tanaman tomat. Panjang gelombang cahayayang digunakan pada penelitian ini adalah 450 nm, 470 nm, 550 nm, 650 nm dan 680 nm denganintensitas masing-masing 1000 lux. Penelitian dilakukan mulai saat pembibitan dari hari ke-0sampai dengan hari ke-18 dan fase pertumbuhan dari hari ke-19 sampai dengan hari ke-53. Saatpembibitan, penyinaran dengan panjang gelombang 680 nm mempunyai laju pertumbuhanpaling besar dibandingkan dengan panjang gelombang lainnya bahkan lebih besardibandingkan dengan pembibitan dibawah sinar matahari (dialam bebas) khususnya padahari ke-1 sampai dengan hari ke-8. Laju rata-rata pertumbuhan dengan penyinaran panjanggelombang ini sekitar 1,11 cm/hari. Sedangkan pada fase pertumbuhan penyinaran denganpanjang gelombang 680 nm tidak memberikan efek yang berarti, sebaliknya laju pertumbuhanpaling besar pada fase ini terjadi pada penyinaran dengan panjang gelombang 650 nm.Kenyataan ini juga diperkuat dengan pengambilan data klorofil-a. Berdasarkan data yangdiperoleh, laju pertumbuhan dan kadar klorofil-a dari penyinaran dengan panjang gelombang650 nm masing-masing adalah 0,07 cm/hari dan 7,784 mg/L. Berdasarkan data-data pengamatanmenunjukkan bahwa pertumbuhan tanaman tomat membutuhkan panjang gelombang berlainanyang merupakan fungsi waktu.

Analisis pengaruh panjang gelombang cahaya terhadap keluaran panel surya tipe polycrystalline Ni Luh Putu Mustia Sridewi; Hery Suyanto; I Gusti Bagus WIjaya Kusuma
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 4 No 2 (2018)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2018.v04.i02.p03

Telah dilakukan penelitian tentang pengaruh panjang gelombang cahaya terhadap daya keluaran pada panel surya tipe policrystalline. Penelitian ini bertujuan untuk mengetahui pengaruh panjang gelombang cahaya terhadap daya keluaran pada panel surya. Pengukuran dilakukan dengan mengukur teganan dan arus pada panel surya menggunakan cahaya lampu berwarna merah, kuning, hijau dan biru dengan panjang gelombang masing-masing 706 nm, 662 nm, 538 nm dan 496 nm. Data Menunjukan bahwa warna merah yang mempunyai panjang gelombang lebih besar, menghasilkan daya keluaran yang lebih besar dibandingkan dengan warna kuning, hijau dan biru. Kata kunci: Panjang gelombang, Daya keluaran, Panel surya, Policrystalline, Cahaya Research on the effect of light wavelengths on the power output of solar panels polycrystalline type. This study aims to determine the effect of light wavelength on the power output of solar panels. Measurements were performed by measuring voltage and current on solar panels using red, yellow, green and blue lights with their respective wavelengths on red, yellow, green and blue lights with a wavelength of 706 nm, 662 nm, 538 nm and 496 nm respectively. Data shows that the red color has a larger wavelength, resulting in greater output power compared to yellow, green and blue. Keywords: Wavelength, Power output, Solar panel, Polycrystalline, lights.

PEMODELAN NUMERIK POLA ARUS PASANG SURUT DI TELUK BENOA, BALI Putu Edi Yastika; Hery Suyanto; I Gede Hendrawan
BULETIN FISIKA Vol 13 No 2 (2012): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Numerical modeling had been carried out patterns of tidal currents in the Benoa Bay, Bali using Princeton Ocean Model (POM) 2 dimensions.The results of modeling tidal currents generated by semidiurnal components (M2, S2) and diurnal components (K1, O1) were average of depths. Data modeling results once validated with observational data obtained value of Root Mean Square Percentage Error Approximation (RMSPEA) of 1.55 for current data and 0.39 for elevation data. Semidiurnal tidal component was the most dominant of all, M2 components produced the greatest flow velocity than other components of 0.43 m/s at the mouth of bay between Serangan Island and Benoa Cape on flood towards ebb tide conditions. From the modeling results showed all component pattern of tidal currents occur strengthening of the current at the mouth of the bay between the island of Serangan and Benoa Cape.

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