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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
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SINTESIS FILM TUNGSTEN OKSIDA (WO3) DENGAN PENAMBAHAN METAL CO-KATALIS BESI (Fe) DAN APLIKASINYA PADA PENINGKATAN AKTIVITAS FOTOKATALITIK DEGRADASI ZAT WARNA METHYLENE BLUE MENGGUNAKAN CAHAYA MATAHARI Burhanudin Syam; Hendri Widyandari
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Degradation of dangerous pollutant with photocatalyst under solar or visible light radiation was a brilliant solution for environment pollution complication specifically for waste of liquid. So, we found a efficient photocatalyst which works at under wide spectrum from solar radiation. We report the synthesis of tungsten oxide/ferric oxide (WO3/Fe2O3) composite material and study the role value of weight ratio loaded for Fe co-catalyst material to crystal structure, morphologhy and the material chemical composition from WO3/Fe2O3 synthesis. And then, the photocatalyst would be application to degradation of methylene blue dye under visible light illumination.The synthesis of the WO3/Fe2O3 was deposited by photodeposition method followed by spray deposition technique on the glass substrate for controlling its morphology and chemical composition. Wearable four variations of mass ratio as data variables to determine the role of variations in the mass ratio of Fe co-catalyst material. The variations are pure WO3 or without Fe additive, WO3 with Fe additve 2%, 4%, and 6%. The composite’s microstructur and composition properties are characterized by SEM (Scanning Electron Microscope), EDX (Energy Dispersive X-ray Spectroscopy) and XRD (X-Ray Diffraction). Result showed, intensity from XRD’s graphic has decrease each additive co-catalyst Fe, so could be influence at WO3/Fe2O3 crystal size. The more quantity of additive weight ratio co-catalyst Fe againts WO3 then the crystal size of thin layer would be smaller. And then from methylene blue photodegradation result, the decrease intensity of C/C0 concentration  more faster and constant especially for 6% additive co-catalyst Fe. Then, the photodegradation sample has result more pure than 5 sample others. Keywords : WO3/Fe2O3, Photodegradation, photodeposition method, composite material, co-catalyst
SISTEM IDENTIFIKASI KUALITAS DAGING SAPI DENGAN METODE PENGOLAHAN CITRA MENGGUNAKAN TELEPON SELULER DENGAN SISTEM OPERASI ANDROID Nurul Huda Prasetyo; Kusworo Adi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research on Beef quality identification system with image processing method using android smartphone had been carried out at Diponegoro University electronic and instrument Physics Laboratory. In this research, a segmentation algorithm extents and extent of meat and fat classification decision tree. Which can be run on smart phones with Android as the operating system. Characteristics that are used to distinguish the quality of beef (marbling score) in this study is the extent of fat,and meat. From the research that has been done can be concluded that the developed system is able to perform image acquisition and identifying beef marbling score well. The system is designed using decision tree-based classification method and the results obtained in the testing accuracy of 90% and 84% on the acquisition of training at a distance of 30 cm.
SISTEM TELEMETRI PEMANTAUAN SUHU LINGKUNGAN MENGGUNAKAN MIKROKONTROLER DAN JARINGAN WIFI Munarso Munarso; Suryono Suryono
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research has been done to make a systems of sensors and telemetry systems for data acquisition the ambient temperature based microcontroller and used Wi-Fi networks. This research also aims to make a computer software telemetry systems that can perform real-time data acquisition ambient temperature. Telemetry monitoring the ambient temperature is very important because it can take measurements remotely and in a place that is not affordable. Research has been carried out by designing, manufacturing, and testing telemetry systems which consists of two main parts: the transmitter and receiver. At the transmitter consist of components LM35, ATmega8535 microcontroller, and Wi-Fi radio. While at the receiver consists of a Wi-Fi receiver and computer. Based on the results of the characterization of the sensors and data acquisition, the dependent between the data obtained by the equation ADC and temperature standard thermometer y = 1.0027x + 0.2801. At the receiver, systems can work in reading data, display data in graphs and store data in the MySQL database systems. From the results of the ambient temperature telemetry systems calibration against standard measuring instrument obtained correlation value of R = 0.9988. So the correlation value obtained from this it can be concluded that the telemetry systems as a whole is functioning properly in the ambient temperature measurement data acquisition. Keywords: temperature, telemetry, microcontroller, temperature sensor LM35, WIZ110SR
ANALISIS REMBESAN PADA BENDUNGAN CENGKLIK MENGGUNAKAN METODE RESISTIVITAS KONFIGURASI SCHLUMBERGER DAN UJI PERMEABILITAS UNTUK MENGHITUNG DEBIT REMBESAN Fajar Waskito; Tony Yulianto; Dwiyanto Joko Suprapto
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Resistivity method is one of the geophysical method that used to determine the subsurface structure from the resistivity value. The research uses resistivity method with Schlumberger configuration. The measurement have been done in Cengklik Dam which is located in the Ngargorejo village, Ngemplak districts, Boyolali, Central Java. Cengklik dam is used for irrigation, fish farms and tourism. The conditions of Cengklik dam is awful. There are a lot of cracks on the dam body and a spring appears in the southwest of the dam. So, we assumed that there are seepages on the dam. We get the potential and current value from aquisition and they used to calculate the apparent resistivity. IP2WIN software use to calculate and modeling to get the true resistivity and depth of each layers. Then they used as an input on Progress software to get the 3 dimensional modeling using Rockwork 15 software. The model interpreted with geological information to know the lithology. There is a seepage area on the tuff layer and the discharge seepage obtained by using the Slide 6.0 software. The discharge amount of seepage as 9,4576x10-5m3/s.
STUDI PENGAPLIKASIAN EFEK FOTOKATALIS DARI LAPISAN ZnO:Ag TERHADAP DEGRADASI BAKTERI E.coli Ndaru Adyono; Heri Sutanto; Iis Nurhasanah
Youngster Physics Journal Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research in the field of green technology using photocatalyst materials can be a solution to environmental pollution, especially contamination of aquatic bacteria. These materials absorb energy from the sun and form hydroxyl radicals that kill bacteria. Zinc oxide has a high photocatalytic efficiency with Eg 3.3 eV in the range of UV - visible light. ZnO can be modified by addition of silver in order to improve the effectiveness as well as anti-bacterial properties. ZnO:Ag 4% layers prepared with thermal spray coating method with deposition temperature at 250ºC and aneling temperature at 450 ºC. XRD measurements performed with CuKα radiation with wavelength at 1.54060 Å and the diffraction angle in range 20 ° - 70 °. The diffraction patterns were identified using the Crystallography Open Database (COD) and software QUALX. ZnO (Id 101-1259) phase and metal Ag (Id 151-2487) phase has formed, but there are also silver oxide phase AgO (Id 150-9488) and Ag2O (Id 150-9684). Crystallite size has been calculated using Debye-Scherrer equation resulted an average value 43.46 nm. The optical properties were measured using a UV-Vis spectrometer in the wavelength range 250-800 nm. Transmittance spectrum were converted into an absorbance spectrum using the Beer-Lambert law. Eg value were analyzed with methods tauc's plot. Linear extrapolation (αhν)2 against hν provide direct transition Eg value 3.1 eV. Photodegradation ability of ZnO:Ag layer performed on E.coli bacteria. TPC measurement results were analyzed using the degradation rate graph, Ct (bacteria concentration) against time exposure. The degradation rate values obtained 1.554 x 10-17 (cfu/ml)-2(minutes)-1.Keywords : ZnO:Ag, band gap energy, XRD, Uv-Vis, TPC, degradation rate.
Simulasi numerik gaya dielektroforesis pada biopartikel berbentuk bola Much. Azam
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This paper presents results of simulations of the electric field and dielectrophoretic force on a bioparticel suspended in a host liquid lying between point-plate electrodes. The method of calculation is based on the method of dipole images using the finite-elemen technique. We have investigated the effect of the bioparticle permittivity, and liquid permittivity on the dielectrophoresis spectrum. The results show that the bioparticle permittivity, and liquid permittivity influence to the dielectrophoresis spectrum on  the different frekuensi range and the point-plate electrode configuration is suitable with dielectrophoresis system because the configuration  can produce the  inhomogen electric field.Keywords: Dielectrophoresis, sphere bioparticle, permittivity, point-plate elecrode
PEMODELAN STRUKTUR BAWAH PERMUKAAN DAERAH SESAR JIWO KLATEN DENGAN METODE MEDAN MAGNET TOTAL Irfan Roismanto; Tony Yulianto
Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This study, using the method of total magnetic field in the area of ​​Central Java Klaten, aims to interpret the subsurface structure of the fault zones surrounding Prambanan, Wedi, and Gantiwarno district that became the suspect of the aftershocks cause occurring on May 27, 2006. The total magnetic field measurements use GSM19T Series magnetometre with the accuracy of ± 0.5 nT which includes 158 points. From the interpretation result using the second vertical derivative analysis, it can be known that there are three fault areas which are categorised as normal faults. The first fault is found in the volcanic rocks composed by the layers of volcanic breccia, lava and tuff. It is characterised by a change in the susceptibility value from 0.3 to 0.2 cgs. The second section is in Kebo Butak rock formation comprising the layers of sandstone, clay, silt, and algomerat. It is characterised by changes on the susceptibility values from 0.126 to 0.007cgs and from 0.33 0.126 cgs. The last fault is located in the Semilir formation consisting of tuff rocks, pumice breccias and tuffaceous sandstone marked by changes on the susceptibility values ​​from 0.25 to 0.1 cgs and from 0.5 to 0.25 cgs. Keywords: jiwo fault, total magnetic field, klaten
STUDI PENGARUH UKURAN PIXEL IMAGING PLATE TERHADAP KUALITAS CITRA RADIOGRAF Ahmad Sudin; Hendri Widyandari; Zaenul Muhlisin
Youngster Physics Journal Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This study aims to determine the image on each imaging plate which has a different pixel sizes. This research is using a plane X-ray, Computed Radiography (CR) which is used in the diagnostic field. This study uses three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it and use the same factor, namely kV eksposi: 64.5 and mAs: 16. In each of the imaging plate in eksposi 3 times and the results of each radiograph imaging plate will be measured by using a densitometer. Stepwedge radiograph of the measurement results will be obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate will be compared so they will know what the size of the imaging plate which has a higher contrast value. Research on the effects of different pixel size on the imaging plate is done in Radiology Hospital Tugu Semarang, in July 2014. From the results it can be concluded each different pixel sizes on the imaging plate will generate a different image quality.Keywords: pixel,imaging plate,Quality Preview, contras , density
Analisis resiko kebencanaan gempa bumi data mikrotremor di Desa Fulolo Kecamatan Alasa Kabupaten Nias Utara Asronj Bakkit Simanjuntak; Gatot Yuliyanto; Udi Harmoko
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The Measurement of the microtremor has been conducted in the Village of Fulolo, Alasa Subdistrict, North Nias District. The aim of this study is to determine the parameters of HVSR in the form of the dominant frequency value (f0) and amplification factor (A0) and the parameters of soft sediment thickness (H), seismik vulnerability index (Kg), peak ground acceleration/PGA (α) and ground shear strain (γ) as well as analyzing the earth quake disaster risk  in the Village of Fulolo, Alasa District, North Nias District. Microtremor measurements done on 5 points measurement and microtremor’s data were analyzed using Horizontal to Vertical Spectral Ratio’s method. The HVSR analysis is in the dominant frequency (f0) value and amplification (A0) value. Then calculate the thickness of soft sedimentary , the value of peak ground acceleration/PGA(α), the value of seismic vulnerability index (Kg) and the value of ground shear strain (γ).The results showed that the village of Fulolo have dominant frequency (f0)  distribution grade range up 0,954 Hz to 7,149 Hz, the value of amplification (A0) ranges up 0,546 to 7,505, the value of the thickness of soft sedimentary (H) ranges up 8,945 meters t 112,21 meters, the value of peak ground acceleration (α) ranges up 71,78 gal to 194,11 gal, the seismic vulnerability index (Kg) ranges up 2,06 x 10-07 (1/cm s2) to 1,86 x 10-05 (1/cm s2) and the value of ground shear strain (γ) range up 1,031 x 10-04 to 1,338 x 10-03. Area that are high risk of experiencing the ravages of earthquakes are Fulolo 3rd, Fulolo 4th, Fulolo 5th on the Gunung Sitoli Formations (QTg) because of those have a thick layer of soft sediments so that third of the area have a dominant low frequency (f0) and resulting low amplification factor (A0) are high as well as at risk for experiencing shifting rock and deformation of surface layer due to the propagation of earthquake waves.Keywords: Microtremor, HVSR, Dominant Frequency, Amplification, Peak Ground Acceleration, Seismic Vulnerability Index and Ground Shear Strain
PEMANFAATAN TEKNOLOGI PLASMA UNTUK MENINGKATKAN KADAR NITROGEN DAN PROTEIN PELLET PAKAN SAPI DARI LIMBAH TANAMAN JAGUNG M. Shobarudin; Muhammad Nur
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research has been done on the levels of plasma radiation influence elements of nitrogen and protein samples of cow feed pellets from waste corn plant. Plasma being used in this study are positive corona plasma, which are generated using high voltage direct current (DC) with multiple point to plane electrode configuration, where the distance between the electrodes of 2.5 cm.On the research of this variable are used i.e. with voltage variations of quantity (3-9.5) kV, where the samples without treatment used as controls. Plasma reactor used in the research of electrode of multi point to plane, in which the electrodes point is connected to the positive electrode. Distance between electrodes of 2.5 cm.High electrical field strength around the electrodes can ionize the gas molecules of nitrogen around the active electrode. Ions of nitrogen is depositioning to the sample, so would the levels of nitrogen. Voltage variations can affect the amount of ions formed thereby affecting the levels of nitrogen samples. From this research conclusion effective voltage plasma radiation occurs at voltage 4 kV with levels of nitrogen 1.169% or the equivalent of 7.30% protein. These results meet minimum standards of proteins, suggested by Parakkasi (1999) of 7%.Keywords: plasma, ion, pellets, nitrogen, protein.

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