INDONESIAN JOURNAL OF APPLIED PHYSICS
Indonesia Journal of Apllied Physics provides rapid publication of short reports and important research in all fields of physics. Indonesia Journal of Apllied Physics publishes articles that are of significance in their respective fields whilst also contributing to the disclipline of physics as a whole. Articles should be submitted to the Editorial Office of Indonesia Journal of Apllied Physics through this site. Further information on submission is also available at this site
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351 Documents
<![CDATA[Optimizing an Octane Number of Motor Gasoline (MOGAS) 91 RON with Blending Methods ]]>
<![CDATA[Ahmad Mustafid Miftahul Huda]]>;
<![CDATA[Subagjo Wakimin]]>;
<![CDATA[Selvia Sarungu]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 2 (2017): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v7i2.13002
<![CDATA[Motor Gasoline (MOGAS) that serves as modifiers thermal energy into mechanical energy with a Research Octane Number (RON) of 91 was produced by mixing (blending) of two components. RON are high is one of MOGAS specifications needed for good engine performance. To obtain a MOGAS with high RON usually needs additional materials, chemical components. In this work we don’t need any additional materials to increasing the RON. In the field of oil and gas blending method is a method that is widely used to acquire new products that are superior and achieve quality standards. The components used in blending these are products with a value of RON 88 and 92. Examination of specific gravity (ASTMD-1298) was conducted to obtain specific gravity (SG) and temperature observations (T), while the ASTMD-86 distillation examination was conducted to determine the components in materials. The results showed that the product specifications in accordance with the existing products on the market. The acquisition of distillate reached 95% with losses of about 3.9%, and the residue of 1.1%.]]>
<![CDATA[Back Matter Vol 07 No 01 2017 ]]>
Mohtar Yunianto
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 1 (2017): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v7i1.19970
<![CDATA[Modification of Materials and Thickness Layer of Radial Piercing Beamport (RPB) Reflector on Kartini Reactor for Boron Neutron Capture Therapy (BNCT) ]]>
<![CDATA[Octaviana Erawati F]]>;
<![CDATA[Riyatun R]]>;
<![CDATA[Suharyana S]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 5, No 01 (2015): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v5i01.270
<![CDATA[Modification of materials and thicknesses reflector RPB of Kartini reactor has been done to support cancer therapy with BNCT method. Modifications have been investigated by computer simulation method based on software MCNP5. Neutron beam for BNCT must be fulfill the criteria recommended by International Atomic Energy Agency (IAEA), two of which are n.cm-2.s-1 and . Before the modification of the neutron beam done, the measurements in the end of the RPB indicate that n.cm-2.s-1 and . These conditions were not fulfilling the requirements of the IAEA, so that the modification of the reflector material and thickness layer of RPB should be done. Those modifications were done by varying the materials PbF2, Pb-nat, 209Bi, Ni-nat (95%) and Fe-nat. The simulation result showed if the material Ni-nat (95%) on the thickness 1.5 cm was use as a coating material reflector optimally. The results after the modification showed that increased 7,54% with the increase amounted to n.cm-2.s-1. decrease 21,45%, then decreasing the value of became 1,70. After the modification the results has not yet fulfill the criteria of the IAEA. Because of the reflector was not the only guide neutron beam. Moderator and filter have not been optimized to deliver results for files that match the criteria of the IAEA for BNCT. Therefore, in future studies modified with the addition of a neutron moderator and also filter is expected to help increasing the quantity of and decreasing of .]]>
<![CDATA[Influence of Sugar Palm Ash Fraction and Resonator Configuration on Acoustic Absorption Performance of Expose Brick ]]>
Zulfa Kamila R; Iwan Yahya; Utari U
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 01 (2014): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v4i01.1160
<![CDATA[Sound absorption performance optimization of expose brick has been conducted in associated with the fraction of sugar palm ash in its raw material and configuration of Helmholtz resonators inside the brick structure. The testing was conducted experimentally refer to ASTM E-1050-98 standard procedure. In this case there are three variations sugar palm ash fractions of 0%, 5%, and 10%, as well as two array resonator configurations. The results showed that the brick with fraction of 10% sugar palm ash has the best sound absorption performance. As for the configuration of array identical Helmholtz resonator giving better performance improvement at low frequency span than complex resonator structure with coupled cavity where the best performance occur on(376-488) Hz frequency range with the absorption coefficient α of 0.54.]]>
<![CDATA[Sintesis Nanopartikel Cobalt Ferrite (CoFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya ]]>
Eko Arief Setiadi; Nanda Shabrina; Hesti Retno Budi Utami; Nur Fadhilah Fahmi; Takeshi Kato; Satoshi Iwata; Edi Suharyadi
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 01 (2013): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v3i01.1216
<![CDATA[Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe2O4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample withsmallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of CoFe2O4 was influenced by grain size and crystallinity.]]>
<![CDATA[Analisa Sea Level Rise Dari Data Satelit Altimetri Topex/Poseidon, Jason-1 Dan Jason-2 Di Perairan Laut Pulau Jawa Periode 2000 – 2010 ]]>
Hastho Wuriatmo; Sorja Koesuma; Mohtar Yunianto
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 2, No 02 (2012): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v2i02.1296
<![CDATA[It has been conducted a research about sea level rise (SLR) in surrounding Jawa island by using satellite altimetry data Topex/Poseidon, Jason-1 dan Jason-2 for period 2000 – 2010. Satellite altimetry is satellite which specially design for measuring dynamics of sea water. Those satellite lauched firstly in 1992 incorporation between National Aeronautics and Space Administration (NASA) dan European Space Agency (ESA). There are six locations for measuring SLR i.e. Jakarta, Semarang, Surabaya, Pangandaran, Jogjakarta dan Prigi. We choselocations based on alongtrack of satellite and near the big cities in Jawa island with dimension area around 0.5ox0.5o degrees. We found SLR rate for Jakarta (2.5 ± 0.24 mm/yr), Semarang (2.16 ± 0.20 mm/yr), Surabaya (2.72 ± 0.19 mm/yr), Pangandaran (0.71 ± 0.33 mm/yr), Jogjakarta (0.91 ± 0.38 mm/yr) and Prigi (1.3 ± 0.38 mm/yr). The average SLR rate for North coast is (2.46 ± 0.21 mm/yr) and for South coast (0.97 ± 0.36 mm/yr). This results are wellcorrelated with data from tide gauge stations.]]>
<![CDATA[Kajian Gejala Penyearahan Optik pada Metamaterial Chiral ]]>
<![CDATA[Juliasih Partini]]>;
<![CDATA[Kamsul Abraha]]>;
<![CDATA[Arief Hermanto]]>;
<![CDATA[Satoshi Tomita]]>;
<![CDATA[Matsui Takahiro]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v4i02.4980
<![CDATA[Chiral metamaterial is a new breakthrough in the fabrication of a metamaterial because of the capability of providing different refractive index values for each circular polarization angle. This provides opportunities to obtain negative refractive index values, without the necessity to have simultaneously negative values for both permittivity and permeability. This study investigated the optical rectification, which is the phenomenon of second order non-linear optics in the chiral metamaterial. This relates to the testing of the new designs of square structure chiral metamaterial. Optical rectification is often used to 'rectify' femtoseconds laser from the realm of visible light into the terahertz domain. Nonlinear response of metamaterial was observed by terahertz emission spectroscopy. The results showed that the obtained terahertz signal is proportional to the square of the laser power used. This suggests that in theincoherent optical rectification, there is a mixture of optical rectification with the second harmonic wave generation. Development of square-structured chiral metamaterials is expected to be an alternative source of material due to the lack of non-linear material that can be used in the terahertz domain.]]>
<![CDATA[Pengaruh Suhu Sintering Pada Pembuatan Strontium Titanat (SrTiO3) Terhadap Konstanta Dielektrik Menggunakan Metode Co-Precipitation ]]>
<![CDATA[Husnah Rofiko]]>;
<![CDATA[Yofentina iriani]]>;
<![CDATA[Risa Suryana]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 1 (2017): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v7i1.1778
<![CDATA[Strontium Titanate (SrTiO3) with variation of sintering temperatures were prepared by co-precipitation methods. Sintering temperature were varied at 700oC, 800oC, and 900oC for 4 hours. SrTiO3 samples were prepared by Strontium Nitrate and Titanium Tetrabutoxide. SrTiO3 samples were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Resistance Capacitance Inductance (RCL) meter, and Sawyer Tower. SEM images show that the sintering temperatures could affect the grain size of SrTiO3. In addition, crystal size of SrTiO3 (110) affected by sintering temperature. The highest of dielectric constant is 137 on SrTiO3 at sintering temperature of 900oC. Sawyer Tower curves confirmed that SrTiO3 has paraelectric property.Keyword: Strontium Titanate, Co-precipitation, dielectrics constant, paraelectrics ]]>
<![CDATA[Front Matter Vol 06 No 01 2016 ]]>
Mohtar Yunianto
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 6, No 01 (2016): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v6i01.19960
<![CDATA[Weber’s electrodynamics for the hydrogen atom ]]>
<![CDATA[H. Torres-Silva]]>;
<![CDATA[J. López-Bonilla]]>;
<![CDATA[R. López-Vázquez]]>;
<![CDATA[J. Rivera-Rebolledo]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 5, No 01 (2015): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v5i01.260
<![CDATA[The original Weber action at a distance theory is valid for slowly varying effects, and it in addition to predicting all of the usual electrodynamical results, leads to crucial effects where the Maxwell theory fails. The Weber’s approach is an alternative to Maxwell electrodynamics, where the Coulomb's law becomes velocity dependent [1-6]. Here we prove that the Weber’s theory gives the fine structure energy level splitting for the hydrogen atom without the assumption of mass change with velocity.]]>
