Zaenul Muhlisin
Laboratorim Fisika Plasma, Departemen Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang

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Aplikasi Plasma Lucutan Berpenghalang Dielektrik pada Peningkatan Kualitas Air dengan Mengalirkan Air secara Langsung dalam Reaktor Berkonfigurasi Elektroda Spiral-Silinder Muhlisin, Zaenul; Oktiyana, Wulandary; Nur, Muhammad
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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A dielectric barrier discharge plasma reactor has been realized and characterized with air source as a working gas. Ozone and dissolved ozone concentration were measured at various voltages (4 to 8 kV), treatment time ( 1 to 5 minutes), water flow rate 4.167 l/min and different air flow rates (1.5 and 2.5 l/min). And the other hand, for understand the ability of ozone to improve water quality, dissolved oxygen has been measured at various voltage (3.6 to 5.2 kV) and after treatment time (until 90 minutes). Spiral electrode is made by copper wire with circumference length 500 mm and diameters 1 mm, while cylindrical electrode is made from aluminum foil with 450 mm in length. Aluminum foil is stuck at inner wall of PVC tube with 500 mm in length and diameter 1.25 inch. Pyrex is used as dielectric material, with length 500 mm, inner diameter 10 mm and thickness 1 mm The result show ozone is produced have maximum concentration 15.613 ppm and dissolved ozone have maximum concentration 10.305 ppm. As a whole ozone concentration higher than dissolved ozone concentration. Both of ozone and dissolved ozone concentration increases by increase of the voltage applied, increases by increase treatment time and increases by decrease of the gas flow rate inside the reactor. Command dissolved oxygen increases with the increase of the high voltage applied and increases after dissociation ozone in water. Key Words : spiral cylindrical electrode, dielectric barrier discharge, the ozone concentration, the dissolved ozone concentration, dissolved oxygen
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
Sintesis Nanopartikel Cerium Oxide Menggunakan Metode Presipitasi dan Sifat Optiknya Nurhasanah, Iis; Sutanto, Heri; Muhlisin, Zaenul; Nurdianik, Sulistia; Nursanti, Ida
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Cerium oxide nanoparticles have been synthesized using precipitation method in mixed-solvent system of aquades DM and isopropanol with volume rasio of 1:6.  Presipitation wascarried out by dropping amonium hidroxide to cerium nitrate hexahydrate solution until pH of 9. Precipitated was dried at temperature of 60oC for 2 hours and then calcined  for 2 hours attemperatur of 200oC, 300o and 400oC. Optical properties of cerium oxide nanoparticles werecharacterized using UV-Vis spectrophotometer. Cerium oxide nanoparticles exhibit goodtransparency in visible region and strong UV absorbance. These reults suggesting that ceriumoxide nanoparticles are potential as bionanomaterial for application in UV-blocker.Keywords: cerium oxide, nanoparticles, precipitation, UV filter, band gap energy, UV-Visspectrophotometer
APLIKASI PLASMA LUCUTAN BERPENGHALANG DIELEKTRIK PADA PENGOLAHAN AIR SUMUR : PENGARUH TERHADAP pH, KESADAHAN, DAN TOTAL COLIFORM Maylia, Rizky; Nur, Muhammad; Muhlisin, Zaenul
YOUNGSTER PHYSICS JOURNAL Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : YOUNGSTER PHYSICS JOURNAL

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Has conducted research on dielectric barrier discharge plasma applications configured with spiral – chylindrical electrodes to generate ozone free air source. Purpose of this study was to determine the effect of ozone dissolved in water quality through pH, hardness ( CaCO3 ), and total coliform in the waterin the eastern part of the village Gemah.             Electrodes used in this study has a diameter of 3 cm and a length of 15cm. Plasma generation using AC voltage with a voltage of 7 kV. Air flow velocity used 5,5 L/min with a volume of water that will be treated with ozone as much as 1 liter. Dissolved ozone free air is obtained by incorporating into the DBD reactor, out of the reactor, ozone is formed, and flowed into the water. Dissolved ozone concentration were determined by varying the time and use a constant voltage.            The result showed the concentration of dissolved ozone diminishing increments. pH values tend to be fixed and not affected by ozone treatment of water. Water hardness value decreased slightly and the number of total coliform as a whole are likely to remain. Keywords :electrode spiral-cylindrical, dielectric barrier discharge, dissolved ozone concentrate, CaCO3, total coliform, pH.
KARAKTERISTIK THERMOLUMINESCENT DOSIMETERS UNTUK DOSIMETRI IN VIVO PADA RADIOTERAPI EKSTERNA Mursiyatun, Mursiyatun; Setiawati, Evi; Muhlisin, Zaenul
YOUNGSTER PHYSICS JOURNAL Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : YOUNGSTER PHYSICS JOURNAL

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The Characteristics of Thermoluminescent Dosimeters (TLD) for in vivo dosimetry in external radiotherapy have been examined. The research was intended to determine the TLD calibration factor and TLD correction factors to various radiation doses, source surface distance (SSD), size field and angle of incidence so that the TLD can be beneficial for in vivo dosimetry. TLD was placed on the surface of solid water phantom and ionization chamber at the reference depth (10 cm). Then was irradiated using 6 MV photons with variation in radiation doses, SSD, size field and angle of incidence. The research  resulted in the TLD calibration factor (4,26 + 0,3) x 10-2 cGy/nC. The value of TLD correction factors at the number of MU 100, SSD 100 cm, size field 10 x 10 cm2 and angle of incidence 00 was 1.Keywords: Thermoluminescent Dosimeters (TLD), in vivo dosimetry, calibration factor, correction factor
KAJIAN TAMPANG LINTANG HAMBURAN ELEKTRON DENGAN ION MELALUI TEORI HAMBURAN BERGANDA (MULTIPLE SCATTERING THEORY) Khamdani, Nouval; Nur, Muhammad; Muhlisin, Zaenul
YOUNGSTER PHYSICS JOURNAL Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : YOUNGSTER PHYSICS JOURNAL

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Theoretical studies have been conducted on the Cross-sectional scattering equation which is one of the effects from collisions between electrons with ion. This theoretical studies aim to obtain the differential cross-section scattering equations of electrons with ion. Born approximations were used and convert potential energy into potential energy which is obtained from the distribution of ions in the Debye sphere, so the new equation for the scattering of amplitude that can write  will comparable with total sum of ions and also the scattering of cross section is   will too comparable with the large of Debye sphere. Keywords: scattering of amplitude, scattering of cross section, Born approximation, potential energy, Debye sphere, total sum of ions
STUDI PENYISIHAN EMISI KARBON MONOKSIDA (CO) PADA ASAP ROKOK FILTER DAN CERUTU DENGAN VARIASI TEGANGAN LISTRIK MENGGUNAKAN TEKNOLOGI PLASMA Fiberia Ramadhani, Dhila; Setiyo Huboyo, Haryono; Muhlisin, Zaenul
Jurnal Teknik Lingkungan Vol 3, No 4 (2014): Jurnal Teknik Lingkungan
Publisher : Diponegoro University

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Smoking area in public area is not the solution because it can not reduce the dangers posed by cigarette smoke. Therefore, this study aims to determine the concentration of CO in cigarette smoke without the use of plasma technology, determine the concentration of CO of any power supply voltage variation using plasma technology and analyzing CO emission removal efficiency of each power supply voltage variations are used in plasma technology. In this study, tobacco use is the type of filter cigarettes and cigars. In addition, the plasma reactor used is a type of Dielectric Barrier Discharge (DBD) with 1kV voltage variation; 1,5 kV and 2 kV. The result showed that the power supply voltage of 1.5 kV has the highest efficiency, ie 72.4% for cigarette filters and 94.8% for cigarettes cigars.
STUDI PENYISIHAN EMISI CO PADA ASAP ROKOK KRETEK FILTER DAN NON FILTER DENGAN VARIASI TEGANGAN LISTRIK MENGGUNAKAN TEKNOLOGI PLASMA Mestika Diza, Aulia; Setiyo Huboyo, Haryono; Muhlisin, Zaenul
Jurnal Teknik Lingkungan Vol 3, No 4 (2014): Jurnal Teknik Lingkungan
Publisher : Diponegoro University

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Imperfect burning produces carbon monoxide (CO) which has harmful impacts and effect to human, both active and passive smokers. Plasma technology can be used as an alternative for CO reduction. This research aims to determine the concentration of  CO in smoke filter and non-filter cigarettes before and after using plasma technology and analyze the effect of electrical voltage variation to reduction of CO content. The experiment were implemented using dielectric barrier discharge (DBD) reactor series by using DC current shock, at various tension 1 kV, 1.5 kV, and 2 kV. The experiment result has shown that the reduction of CO content is mostly effective upon using 1,5 kV tension by reduction efficiency each type of cigarettes at 95,8 % and 87,5%
STUDI PENYISIHAN EMISI NITROGEN OKSIDA (NOx) PADA ASAP ROKOK FILTER DAN KRETEK DENGAN VARIASI TEGANGAN LISTRIK MENGGUNAKAN TEKNOLOGI PLASMA Yogi Alfarobi, Sariyang; Setiyo Huboyo, Haryono; Muhlisin, Zaenul
Jurnal Teknik Lingkungan Vol 3, No 4 (2014): Jurnal Teknik Lingkungan
Publisher : Diponegoro University

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There are many toxic elements of tobacco smoke, one of which is a nitrogen oxide (NOx). This study aims to determine the effect of elimination of cigarette smoke before and after using a plasma reactor and perform calculations on the efficiency of each power supply voltage variations. The study was conducted by research such as determining variables and do the research procedures. The independent variables used are variations of the electric voltage of 1 kV; 1.5 kV; and 2 kV was tested for cigarette filter types and clove cigarettes. For the independent variable is the concentration of nitrogen oxides (NOx) in cigarette smoke. For the control variables of the gas flow rate 2,2L / min and the amount of cigarettes that are used in each test are 2 . The procedure research which is conducted by cigarette burning on the inlet and suck the smoke using the handpump and running it into the gas reservoir tube to homogenized, after it flowed into the reactor and measured plasma concentrations of NOx gases contained in cigarette smoke using a gas analyzer. The results showed that plasma technology can lower the NOx concentration. With the best results obtained when using a power supply voltage of 1,5 kV at each of the various types of cigarettes.
STUDI PENGARUH TEGANGAN DAN FLOWRATE GAS TERHADAP KONSENTRASI COD DAN WARNA PADA LIMBAH CAIR INDUSTRI TEKSTIL DENGAN TEKNOLOGI PLASMA Sucipta, Febriandi; Oktiawan, Wiharyanto; Muhlisin, Zaenul
Jurnal Teknik Lingkungan Vol 4, No 1 (2015): Jurnal Teknik Lingkungan
Publisher : Program Studi Teknik Lingkungan Fakultas Teknik Universitas Diponegoro

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The textiles wastewater has high concentrate of COD and Color. The initial of COD concentration is 3250 mg/L and concentration of color is 2727 PtCo. The wastewater treatment with plasma technology has several advantages compares to other treatments. This research has been conducted to analyze the effects of voltage (9,11,13kV) and oxygen flowrate (0.25,0.5,1.0 L/m) on COD and color concentration. The pretreatment on this research was using filter papper and 5 minutes aeration with pure oxygen. Based on this research and discussion of qualitative and quantitative statistical test, voltage and flowrate variations affect the concentration of COD and color. The greater voltage and flowrate are used, the smaller COD and color concentration being resulted after  the process. The highest removal efficiency occures at 13 kV of voltage and 1 L/min of flowrate. By this condition, removal efficiency of COD is  68% with a final concentration 833 mg/L and efficiency of  color parameters is 71%  with final concentration 455 PtCo.