ORCID Profile
0000-0002-1648-026X
Current Organisation
Universitas Negeri Yogyakarta
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Publisher: Journal for Educating Gifted Young Scientists (JEGYS)
Date: 15-09-2019
Abstract: The objectives of this study are to: a) Produce an Android-based Interactive Physics Mobile Learning Media (IPMLM) that is eligible for improving Higher-order Thinking Skills (HOTS) of high school students b) Determine the effectiveness of the use of Android-based interactive physics mobile learning media with a scaffolding learning approach in improving Higher-order Thinking Skills (HOTS) for high school students. The development procedure in this study was modified from the 4D development model (defining, designing, developing, disseminating). The research subjects were 1070 high school students in five regencies/cities, they are Sleman Regency, Bengkulu City, Pontianak City, Kupang City, and Bima City. In each city was chosen four schools for extensive trial and limited trial. The products developed were Interactive Physics Mobile Learning Media (IPMLM) applications, lesson plan, student worksheets, higher-order thinking skills test instruments in the form of reasonable multiple-choice questions, student questionnaire responses towards media and learning activities as well as validation sheets and product eligibility. The technique of analyzing the data of empirical test questions used item response theory analysis by looking at the compatibility of items with the model based on the INFIT MNSQ (infit mean square) value. Extensive test data were analyzed with descriptive statistics and inferential statistics. Inferential statistics were performed using the ANAVA mixed design test with a significance level of α = 0.05. The results show that a) Android-based interactive physics mobile learning media applications and learning devices are appropriate to be used to improve higher-order thinking skills b) the use of android-based interactive physics mobile learning media (IPMLM) with an effective scaffolding learning approach in improving higher-order thinking skills. The effective contribution of the experimental group in increasing the ability of HOTS is 84.80%. The effective contribution of the control group that uses learning tools with the direct learning assisted by Physics textbooks in increasing HOTS ability is 55.50%.
Publisher: Bentham Science Publishers Ltd.
Date: 07-2023
DOI: 10.2174/1573413719666221114094255
Abstract: We reported for the first time the preparation of carbon nanodots/cajuput oil (C-dots/CJO) composites for potential antibacterial applications. The C-dots were synthesized from CJO distillation wastes via the low carbonization method. Then, the C-dots were mixed with CJO to obtain C-dots/CJO composites. The characteristics of the C-dots were determined using UV-Vis, PL, TRPL, FTIR, and HRTEM, whereas the C-dots/CJO composites were characterized using UV-Vis and FTIR. Antibacterial properties were investigated for s les of C-dots, CJO, and C-dots/CJO with no-light, white light, and UV/violet light treatments. The C-dots produced cyan luminescence with a decay lifetime of 6.54 ns. Based on the antibacterial tests, the C-dots/CJO composites have DIZ higher than the pure C-dots The C-dots/CJO composites reached the highest DIZ of 3.6 nm under white light, which was attributed to the photodynamic effect and photodisinfection of the C-dots and CJO, respectively. Hence, the C-dots/CJO composites can be potential antibacterial agents against E. coli bacteria
Publisher: IOP Publishing
Date: 09-2018
Publisher: TEM Journal
Date: 2019
DOI: 10.18421/TEM83-24
Publisher: Optica Publishing Group
Date: 20-10-1994
DOI: 10.1364/AO.33.007200
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5132682
Publisher: UNS Solo
Date: 30-04-2021
DOI: 10.13057/IJAP.V11I1.48326
Abstract: Electrophoresis is one of the experimental methods employed in this study to characterize unique properties of charges of silica nanoparticles (SiO sub /sub ) by observing their electrophoretic phenomena while they are situated in the electric field. This study is aimed to measure one of the SiO sub /sub properties, namely the charge, using electrophoresis method through the variation of electric fields. The charge dependencies of SiO sub /sub was probed towards five times variation of electric fields 1000, 1250, 1500, 1750, and 2000 V/m in 20 mL of aquades. The displacement of SiO sub /sub could be observed through the light microscope with 160x magnification which the recorded observations then were analyzed by timeline-based software to measure the displacement time of particles during the observation. The results revealed that silica nanoparticles have the kind of positive charges in the colloidal solution. It is caused the magnitude of SiO sub /sub charges is ranged constantly despite the variational effect of electric field in the environment. Light microscope has been optimized in this study to measure the velocity of SiO sub /sub that tends to increase with respect to the magnifying electric fields given in the experiment.
Publisher: IOP Publishing
Date: 10-2019
DOI: 10.1088/1755-1315/344/1/012042
Abstract: The groundwater physical condition in Sleman Regency, Indonesia is generally cloudy and contains high amount of iron (Fe) so it is not sufficient to use for daily needs drinking water. High levels of Fe are dangerous for humans. This study aims to process and purify ground water and reduce iron content using laban wood (Vitex pubescens Vahl). This media was chosen because it is a local waste furniture industry in Sleman Regency. Indeed, it is conducted as charcoal. Then, the charcoal is chemically activated by soaking with H2SO4 for 24 hours. Furthermore, it is activated physically by heating up to 120°C for 30 minutes. Laban wood (Vitex pubescens Vahl) activated charcoal was characterized using UV-Vis to determine iron (Fe) levels after filtration. In addition, the filtration water is measured using a pH meter to determine the degree of acidity, TDS meter and the efficiency of light transmission to determine the turbidity. To summarize, Laban wood activated charcoal was effectively used as a filtration media. It gives an effect for increasing the light transmission efficiency, decreasing TDS value, and absorption of iron (Fe) levels efficiency. However, it does not affect the pH value. The highest light transmission efficiency value is found in the adsorbent type of laban activated charcoal which is equal to (6.91 ± 0.005)% at a mass of 500 grams. As for the TDS value, the highest decrease in TDS value was TDS value of (140.0 ± 0.5) ppm when it was 500 grams. The highest efficiency of absorption of iron content is found in the composition of laban activated charcoal which is equal to Fe to (87.27 ± 0.2)%. This activated charcoal can be used as a medium to reduce iron content up to (2.27 ± 0.005) mg / L. Therefore, laban active charcoal which is chemically activated with H2SO4 for 24 hours effective to reduce iron (Fe) levels according to the stipulated clean water requirements Indonesian Minister of Health Regulation Number 416 / MENKES / PER / IX / 1990.
Publisher: IOP Publishing
Date: 12-2019
DOI: 10.1088/1742-6596/1397/1/012010
Abstract: This study aims to find out: 1) generating useful android aplication IPMLM in termodynamic material on physics, 2) examining the impact of IPMLM toward students’ higher order thinking skill (HOTS). In order to find out the answer, the researcher used research and development method in 4-D model (defining, designing, developing and disseminating). The IPMLM application was assessed by media experts and physics expert. The limited test stage was conducted in SMAN 1 Kota Kupang with 32 students of 11th grade science program. Subjects were chosen by purposive s ling technique. The extensive test stage was conducted in SMAN 2 Kota Kupang, SMAN 3 Kota Kupang and SMAN 5 Kota Kupang with 210 students of 11th grade science program. Subjects were chosen by purposive s ling technique. The research design of extensive test was pretest-posttest control group design. Data collection was done by questionnaire and test. Instrument test to measure students’ HOTS instrument was reasoning multiple choice questions. The result shows that 1) the IPMLM application was eligible to be used in physics learning about thermodynamics, 2) using IPMLM in physics learning increased effectively the capability on HOTS aspect.
Publisher: Universitas Pendidikan Ganesha
Date: 04-09-2020
Publisher: Bentham Science Publishers Ltd.
Date: 26-08-2020
DOI: 10.2174/2210681209666190617093904
Abstract: This study aims to study the mixing of graphite with water irradiated by X-ray (low energy gamma ray) towards the formation of graphene oxide (GO). The graphite is obtained from Zinc-Carbon (ZnC) battery wastes. This is a simple alternative technique in synthesizing GO based on X-ray irradiation without involving additional chemicals. X-ray irradiation is conducted upon 10 ml of distilled water using 20 kV of X-ray with irradiation time variation of 3 and 4 h. The X-ray irradiation towards the distilled water causes radiolysis to occur in the water. The graphite solution consists of 0.6 gm of graphite in 100 ml of distilled water. The GO is formed by mixing the X-ray irradiated water with 5 drops of the graphite solution. The s le solutions obtained are shaken several times and left to settle for a night. The s les are then characterized using UV-Visible (UV-Vis) and Fourier transform infra-red (FTIR) spectroscopies, and tunneling electron microscopy (TEM), whereas scanning electron microscope and energy dispersive X-ray (SEM-EDX) characterization is done by coating the s le on glass slides. The UV-Vis characterization results show a red shift of absorbance peaks from 234.5 nm to 244.5 nm as the time of irradiation is increased. These peaks indicate the formation of GO in the s les. The FTIR characterization results indicate that there are functional groups of OH, C=C, and C-O in the s les, which also show the existence of GO. The SEM images show the surface morphology of the s le, which resembles smooth-quadrilateral lump of clays, and the EDX result shows that the s le is composed of 2.86%, 54.02%, 11.62%, 2.2%, 26.23%, and 3.06% of carbon, oxygen, sodium, magnesium, silicon, and calcium atoms, respectively. The occurrence of carbon and oxygen atoms verifies further the formation of GO in the s les. Finally, the TEM result shows few-layers of GO materials supported by the electron diffraction pattern showing hexagonal structure of the GO.
Publisher: American Chemical Society (ACS)
Date: 07-02-2002
DOI: 10.1021/LA0108757
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