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Omega: Jurnal Fisika dan Pendidikan Fisika
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80
Articles
Introducing Undergraduate Students to Nonlinear Dynamics through A Numerical Approach

Nugroho, Fahrudin, Azhari, Irfan Taufiq, Yusuf, Yusril, Nurwantoro, Pekik

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 2 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

This paper describes a numerical method that used to solve the nonlinear Schr\"{o}dinger equation. The methods are an exponential time differencing method and a spectral method. The result indicates that at a certain parameter, fluctuation of wave function has contained chaotic dynamics. This case is expected to be used as an example for introducing numerical methods to undergraduate students on nonlinear dynamics. This introduction is deemed necessary, referring to the curriculum and syllabus used in several educational institutions in various countries that have included the topic of nonlinearity.

Simulating the Aerodynamics Profiles of NACA 4312 Airfoil in Various Incoming Airspeed and Gurney Flap Angle

Sumaryada, Tony, Jaya, Achmad Muharam, Kartono, Agus

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 1 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

Simulations of the aerodynamics performance of NACA 4312 airfoil at various gurney flap angles and incoming airspeed (wind velocities) have been conducted. The gurney flaps size was set at 5.0% length of the chord line. Two airfoil models with gurney flap at 45° and 90° were simulated and compared with the results of plain airfoil (without gurney flap) model with the incoming airspeed of 10.0 m/s, 70.0 m/s and 200.0 m/s. The results have shown that increasing the value of gurney flap angle to 45° and 90° will increase the lifting force of the airfoil and decrease the drag force.

Approximation in Quantum Quadrupole at Juergen Model for Nuclear Reactor Control Rod Blade Based on ce {Th_xDUO2} Nano Materials

Hardiyanto, Moh.

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 1 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

The functional of a multi purpose research nuclear reactor control rod blade nuclear reactor is stabilized and controlling devices for nuclear chain reactions, the existing of Cerenkovs radiation impact and thermal neutron flux in reactor chamber. This research was conducted in Large Hadron Collider (LHC) - Muon Hadron Division at CERN, Lyon - France under International Research between Canadian Deuterium Uranium (CANDU) - Nuclear Reactor and Betha Group Section for sub-particles for nanomaterial. Using Juergen Model with quantum states approaching and testing by Muon-Hadron Stirrer equipment had determined the ce {Th_xDUO2} derivatives materials. This material shown the strength of thermal neutron flux absorbed about 2.56 × 10⁵ − 1.94 × 10⁶ Ci/mm, the value of Electrical Conductivity is 26.62 − 29.98 in 800° - 890° C temperature, however at 2.1 × 10⁵ Ci/mm thermal neutron flux condition is 29.44 − 37.88 in IAEA standard. At 450 tesla magnetic field and 2.1 × 10⁵ Ci/mm thermal neutron absorber, the crystalline structure reduction is 6.88% until 10.95% for 25 years period in 45.7 megawatts with ce {UO2} more enrichment and ce {Pu2O} also ce {Th2O_y} nuclear fuel element matrix.

Ionic Conductivity of Chitosan-based Polymer Electrolyte with Polyethylene Glycol (PEG) as Plasticizer and KCl as Alkaline Ion Transport Source

Maddu, Akhiruddin, Kadapi, Muhamar, Sofian, Irmansyah

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 1 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

Polymer electrolyte films were fabricated utilizing chitosan biopolymer plasticized with polyethylene glycol (PEG) and KCl addition as ionic transport source. The precursor solution was prepared by mixing the chitosan in acetic acid solution and PEG that act as a plasticizer. Into the mixed solution was added KCl salt for as alkalin ion transport source in the polymer electrolyte. The polymer electrolyte films were fabricated by the casting method onto the petri glass. The influence of KCl content on ionic conductivity of the composite polymer electrolyte film was studied. The ionic conductivity of the composite polymer electrolyte film was characterized using LCR meter at a frequency of 1 kHz. The best ionic conductivity was found for the film containing 45 wt% of KCl salt. The activation energy was determined by using Arrhenius plot based on conductivity data at varied temperature. It has been found that the activation energy of the composite polymer electrolyte films varied to the KCL content in the composite polymer electrolyte films. The highest activation energy was found for the polymer electrolyte film with 45 wt% of KCl content.

Synthesis and Optical Characterization of Carbon Dot from Peels of Dragon Fruit and Pear

Hepriyadi, Selvy Uftovia, Isnaeni, .

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 1 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

Fluorescence materials such as carbon dots are unique and non-toxic materials that can be produced using many methods. In this research, synthesis and optical characterization of carbon dots from the peels of dragon fruit and pear have been done. The synthesis uses bottom-up method using microwave with 20 minutes, 40 minutes, and 80 minutes of heating time. The result of optical characterizations showed that the samples that have been heat treated are carbon dots based of the absorbance in the range of 280-350 nm, and the intensity are decreased in the range of visible and infrared wavelength. There are emission and intensity changes by different heat treatments. From the samples of dragon fruits peels, the emission wavelength tended to shift toward visible light at the wavelength of 551.51 nm, 507.98 nm and 487.28 nm with the excitation at the wavelength of 420 nm from pulsed pico-laser. While, the emission wavelength from the samples of pears peels were fluctuate in wavelength of 529.09 nm, 507.52 nm and 519.46 nm. Similarly, the time-resolved photoluminescence characterization test showed that there were time changes in each sample of carbon dot. The decay lifetime of carbon dots was fluctuated between 4.5 ns - 5.4 ns for dragon fruit’s peels and about 1.9 ns - 2.4 ns for pears peels.

Analysis of Quality Tests Created by FKIP-UHAMKA Faculty for Middle Semester in Academic Year 2016-2017

Astuti, Sri, Kusdiwelirawan, Acep, Dahlia, Siti

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 1 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

This research is to analyse the quality of test for midterm examination Academic Year 2016-2017 of FKIP UHAMKA lectures. The aims of the research were to identify the quality of the test on compulsory institutional courses academic year 2016-2017 and to analyse the weakness point of the lectures in the making of quality test based on the analysis of the test for midterm examination academic year 2016-2017. The method that used in this research was descriptive analysis method through documentation as a data collection technique. Subjects of this research were semester plan document (RPS) and items test were arranged by lectures. The data that will be analysed are consist of 6 courses, including essay and multiple choice questions. The object of the research was the quality of the items test considered by a few aspects that were learning achievement of RPS, substance of items test, items test structure, and culture/grammar. The instrument for data collection were rubric and researcher which were as human instrument. Overall, the result of this research was the items test have quality with level moderate to good. Furthermore, the majority of items test have weakness related to the making of items test which were the decription of indicators: the learning achievements (such as attitude, general and particular skills) and score list on the items test.

Effect of Task Through Test Rankings Based Learning Model REACT to the Achievement of Physics

Amirudin, Dessy, Kusdiwelirawan, A., Soenarto, Y.

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 3 No 2 (2017)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

The aim of this study is to find out the effect of test-based on the ranking task through the learning model of REACT (relating, experiencing, applying, cooperating, and transferring) toward physics learning achievement. The research is held in 105 Senior High School in Jakarta on the even semester of 2015-2016. The population in this research is around 32 students roommates are all investigated. The sampling technique that use is purposing sampling technique. This research use quantitative research. After the data is distributed normally and the homogeneity based on the normality test and homogeneity, the data that is gained the lcount < ltable (0.11 < 0.156). The hypothesis test is done by using the t-test and the result tcount > ttable (8.575 > 1.689) (on the 0.05 significant extent) or 8.575 > 2.456 (on the 0.01 significant extent) which means H0 is rejected, H1 is therefore accepted. All in all this research could bring the effect of test-based on the ranking task learning model through the REACT toward physics learning achievement.

The Influence of Guided Inquiry Student Worksheet on Learning Outcomes and Science Process Skill on the Static Fluid Topic

Falamy, Ryna Aulia, Suyatna, Agus, Wahyudi, Ismu

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 3 No 2 (2017)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

The purpose of this research is to know the influence of guided inquiry student worksheet on learning outcomes and describe learning outcomes and science process skill after using guided inquiry student worksheet. This research method was true experiment, with a sample grade of VIII H as a control class and VIII J as an experimental class, determined by purposive sampling technique. The study design used pretest-postest control group design. The data had been tested by using N-gain analysis, normality test, homogeneity test, and independent t-test. The results showed a significant effect of the use of guided inquiry student worksheet to the results of student learning outcomes. The average learning outcomes in cognitive domain of 85.24 and the improved learning outcomes with N-gain 0.81.

Resonance Contributions to $\eta$ Photoproduction on the Nucleon in the Isobaric Model

Burhendi, Feli Cianda Adrin

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 3 No 2 (2017)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

The contributions of the resonances $S_{11}(1535)$, $S_{11}(1650)$, and $P_{11}(1710)$ to gamma nucleon $\rightarrow$ eta nucleon are found. In order to estimate model dependence of the obtained resonance characteristics, an isobaric models used for analysis. For the resonances considered, our analysis yields mass values compatible with those advocated by the Particle Data Group. We emphasise, however, that cross-section data alone are unable to pin down the resonance parameters and it is shown that the beam and or target asymmetries impose more stringent constraints on these parameter values. The amplitude transitions of Feynman diagrams at the center of mass frame used to find amplitude squares involving the s-channel, u-channel, and t-channel on Born term and resonance. The value of the differential cross section on the energy system used by 1.685 MeV up to 2.795 MeV.

Microwave Absorber Properties \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} Using Sol Gel Synthesis Methods

Laksanawati, Wahyu Dian, Kurniawan, Budhy

Omega: Jurnal Fisika dan Pendidikan Fisika Vol 3 No 2 (2017)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

This paper reports the process and the results are supplemented by material microwave absorber characterisation \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} which has been synthesised by sol gel method. Results refinement of the XRD data showed that the material \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} have formed a single phase. From the results of using the software refinement High Score obtained crystal size on sample of 21.18 nm. Number of spin concentration in the sample at ESR test results showed a decrease when doping Ni increased, the area under the curve of absorption decreases as 388.718. This is due to the substitution of \ce {Ni^{2+}} ions \ce {Mn^{3+}} ions thus inhibiting electron hopping of electrons $\mathrm{e_g}$ (\ce {Mn^{3+}} ion) to $\mathrm{t_{2g}}$ (\ce {Mn^{4+}} ion) in the mechanism of double exchange so that the spin of the electrons will $\mathrm{t_{2g}}$ antiparallel. Competition between ferromagnetic properties with antiferromagnetic spin make will change the direction so that the sample magnetisation will decrease and the magnetic moments become random. ESR results are used to confirm the results of the VNA. Microwave absorption ability is indicated by the value of reflection loss on the sample is $-66.67$ dB.