Radiation-Induced Polymerization of Acrylamide and Methacrylamide-Based Polymer Gel Dosimeters

Radiation-induced polymerization of acrylamide and methacrylamide-based polymer gel dosimeters potentially used for the verification of complex dose distributions in 3D associated with conformal radiotherapy has been studied using nuclear magnetic resonance (NMR), Raman spectroscopy and impedance analyzer methods at room temperature. Three polymer gels of polyacrylamide (PAAmG), polymethacrylamide (PMAAmG) and poly(acrylamide-co-methacrylamide) (PAAm-co-MAAmG) were synthesized in oxygen free condition from acrylamide (AAm) and methacrylamide (MAAm) as monomers and N, N'-methylene-bis-acrylamide (BIS) as Crosslinker at various concentration from 2% to 6% and 6% gelatin. The comonomers (AAm, MAAm and BIS) were dissolved in an aqueous gelati

The Influence of Problem Based Learning (PBL) Model on Students Learning Outcome

This study aims to determine the effect of problem based learning models assisted by PhET simulations on student learning outcomes in wave material. This research is a type of quasi-experimental research with nonequivalent control group design. The population in this study were all students of class XI MAN 1 Mataram. The research samples were students in class XI MIPA 3 with a total of 31 people as the control class and students in class XI MIPA 4 with a total of 29 students as the experimental class. The test instrument used is in the form of multiple choice questions. The results of the analysis show that the average score of physics learning outcomes in the psychomotor domain in the experimental class is 3.43, while for the control class the average value is 3.06. Analysis of physics learning outcomes in the affective domain of the experimental class was 3.34, while for the control class the average value was 3.13. The results of the questionnaire analysis of student responses in the experimental class obtained an average of 63.63. The results of testing the hypothesis using the t-test obtained a tcount of 6.45 and a ttable of 2.00. Thus the value of tcount is greater than ttable then Ha is accepted and H0 is rejected. This means that there is an influence of the problem-based learning model assisted by PhET simulations on student learning outcomes in wave material

Penerapan Model Pembelajaran Kuantum pada Matakuliah Fisika Kuantum Ditinjau dari Motivasi Berprestasi

This study aims to determine (1) the influence of quantum and conventional learning model on the learning achievement of quantum physics course, (2) the influence of student achievement motivation on learning achievement of quantum physics course, and (3) the interaction between the quantum and conventional learning model with achievement motivation students' learning achievement of quantum physics course. This type of research is quasi experiment with forms of research design is a 2x2 factorial design. The population in this study were all students of physical education in the school year 2011/2012 VI semester FKIP Mataram University with a sampling technique that random sampling. There are two samples of the study as control and experimental class. The control class given conventional learning while the experimental class was given treatment with quantum learning model. Data were analyzed using analysis of variance (ANOVA) of two different cell. Where, (1) there is the influence of quantum and conventional learning model on the learning achievement of quantum physics course that is obtained significance level (0.047) < (0.05), (2) there is influence student achievement motivation high and low categories of the learning achievement of courses quantum physics is obtained significance level (0.000) < (0.05), and (3) there is no interaction between the quantum and conventional learning model with student achievement motivation on learning achievement of quantum physics course that is obtained significance level (0.190) > (0, 05)

Percobaan Efek Foto listrik Berbasis Arduino Uno dengan LED 3 Warna sebagai Sumber Cahaya

This study aims to create a tool that can explain the event of the photoelectric effect on a laboratory scale. So that the existence of a tool that can explain the photoelectric effect will make it easier for users to study the nature of light as a particle. This tool is designed according to its function which will find out that the photoelectric effect event is not influenced by light intensity but is influenced by the frequency of a light source and the wavelength that illuminates a metal so that electrons will move from a negative source towards a positive voltage source. In the manufacture of these tools, a photodiode is used as a light sensor where when the photodiode is illuminated by light it will cause electrons to move from the cathode to the anode and make an electric current flow. To determine the stopping voltage, a voltage is applied to the cathode where the electrons are ejected. This stopping voltage for each wavelength is different. From the ongoing data retrieval, a graphic relationship is obtained between the ADC value and the Sensor Output Voltage. Thus, it can be concluded that, First, the voltage applied to the photodiode (cathode) is different for each color spectrum. Second, the output voltage obtained for each different wavelength, the less light intensity received by the photodiode, the smaller the output voltage value. The amount of output voltage for each LED color is different because the wavelength of each color is also different so the value is not the same

PENGARUH PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH TERHADAP HASIL BELAJAR PADA MATAKULIAH FISIKA KUANTUM BAGI MAHASISWA CALON GURU

ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran berbasis masalah terhadap hasil belajar serta peningkatannya. Materi fisika kuantum yang diteliti meliputi lima sub pokok bahasan yaitu: Persamaan Schrodinger, Operator Fisis, Komutator, Persamaan Gerak Heisenberg, dan Osilator Harmonis. Jenis penelitian ini adalah eksperimen dengan desain penelitian pretest and posttest group design. Populasi dalam penelitian ini adalah seluruh mahasiswa pendidikan fisika tahun pelajaran 2018/2019. Pengambilan sampel menggunakan teknik total sampling dengan mahasiswa semester VI A sebagai kelas eksperimen dan mahasiswa semester VI B sebagai kelas kontrol. Hipotesis penelitian diuji menggunakan uji-t dengan pretest and posttest dan peningkatan hasil belajar diuji menggunakan persamaan N-gain. Berdasarkan hasil uji hipotesis untuk hasil belajar fisika kuantum diperoleh nilai thitung (1,91)> ttabel (1,68) pada taraf signifikansi 5%, sehingga dapat disimpulkan bahwa terdapat pengaruh penerapan model pembelajaran berbasis masalah terhadap hasil belajar fisika kuantum bagi mahasiswa calon guru. Selanjutnya peningkatan hasil belajar fisika kuantum terlihat dari skor N-gain tertinggi pada kelas eksperimen terdapat pada sub materi komutator dan osilator harmonis sebesar 72%, sedangkan skor N-gain tertinggi untuk kelas kontrol terdapat pada sub materi osilator harmonis sebesar 60%. Kata kunci: model pembelajaran berbasis masalah;hasil belajar; fisika kuantum ABSTRACTThis study aims to determine the effect of problem-based learning models on learning outcomes and their improvement. The quantum physics material studied includes five sub-subjects, namely: Schrodinger's Equation, Physical Operators, Commutators, Heisenberg's Equation of Motion, and Harmonic Oscillator. This type of research is an experimental research design with pretest and posttest group design. The population in this study were all physics education students for the 2018/2019 academic year. The sample was taken using total sampling technique with the VIA semester students as the experimental class and the VIB semester students as the control class. The research hypothesis was tested using the t-test with pretest and posttest and the improvement of learning outcomes was tested using the N-gain equation. Based on the results of hypothesis testing for the learning outcomes of quantum physics, the tcount (1.91) > ttable (1.68 ) is obtained at the 5% significance level, so it can be concluded that there was an effect of applying problem-based learning models on learning outcomes of quantum physics for prospective teacher students. Furthermore, the increase in learning outcomes of quantum physics can be seen from the highest N-gain score in the experimental class in the commutator and harmonic oscillator sub-material by 72%, while the highest N-gain score for the control class is in the harmonic oscillator sub-material by 60%. Keywords: problem based learning model; learning outcomes; quantum physics

Analysis Magnetic Mineral Content of Natural Iron Sand in Beach Island Lombok as Basic Materials of Micro Wave Absorbers

This study aims to analyze the content of the magnetic mineral compound of natural iron sand on the beach of Lombok Island. This study uses the experimental method by taking primary data which is carried out in three locations, namely at Ijobalit Beach (East Lombok), Cemara Beach (West Lombok), and Telindung Beach (East Lombok). The study stage begins with a separation of natural iron sand, then a magnetic mineral separation is carried out to obtain Fe3O4 powder. The last stage is testing the Fe content using AAS (atomic absorption spectrophotometry). The research results were obtained by the percentage of magnetic mineral content from Ijobalit beach sand, Cemara Beach, and Telindung Beach respectively 93.56, 72.99, and 87.00%. The results showed that natural iron sand from Ijobalit beach had great potential to be used as a basic material for making microwave absorbers

Effectiveness of Guided Inquiry Learning Tools to Improve Understanding Concepts of Students on Momentum and Impulse Materials

This study aims to the effectiveness of guided inquiry learning tools to improve understanding concepts of students on momentum and impulse materials. The learning device was developed using a 4D model consisting of four steps, namely define, design, develop and disseminate. This research was conducted at SMAN 4 Mataram in the tenth grade of MIPA 1 with a total of 20 people. The data was obtained in the form of pre-test and post-test scores. The data were analyzed using the Shapiro Wilk test and paired sample t-test at a significance level of 5%. The results of the Shapiro Wilk test show that the data are normally distributed and meet the requirements to perform a parametric test. The results of the paired sample t-test show that the t-count (24.347) is greater than the t-table (2.093).  This means that there is influence of guided inquiry learning tools improves understanding concepts of students. These results indicate that the guided inquiry learning model is effective to improve understanding concepts of students on momentum and impulse material

Development of Learning Media for Wave Ripple Tanks with the Implementation of Guided Inquiry Models on Students' Mastery of Concepts and Scientific Creativity

The purpose of this study was to develop learning media for wave ripple tanks with the implementation of guided inquiry models on the conceptualization and creativity of students in physics subjects in class XI with the material of mechanical wave characteristics. The wave ripple tank learning media is used as a tool in the learning process that can improve students' mastery of concepts and creativity. This study uses the Research and Development method with a 4D design (Define, Design, Development, Disseminate). At the defining stage, the initial analysis was carried out, namely examining the background behind the emergence of researchers' ideas. The design stage is carried out by designing the wave ripple tank learning media with the implementation of guided inquiry models. The development stage is a development activity as well as an assessment of the experts which includes the validation test of the development results of the device, media ripple tank learning, and assessment instruments. The last stage is the dissemination stage, where the results of this study are distributed to schools to be used as a model that can be use

Development of Inkuiri Model Learning Tools Guided to Improve Concept Mastery Learner Physics

This study aims to determine the validity, practicality, and effectiveness of guided inquiry learning models to improve students' mastery of physics concepts. This type of research includes research and development of Research and Development (RnD) with the research design used is the 4D model which consists of define, design, develop and disseminate. Products developed in the form of a syllabus, lesson plans, student worksheets, test instruments in the form of questions, and learning videos. The product validity was analyzed by determining the value of the content validator index (CVI) through a questionnaire. Practicality is obtained from student response questionnaires and learning implementation sheets. Furthermore, the effectiveness is obtained from a limited trial to obtain the N-gain test value. The results of the study based on the CVI average value assessment of expert validators and practitioner validators approached one with the very good category. The reliability of learning devices above 75% indicates that all aspects assessed are included in the reliable category. The results of the response of students obtained <80% with practical criteria and the average implementation of learning for three meetings was 87.7% with very practical criteria. The N-gain result of the concept mastery is 0.63 in the medium category. Based on these results, it can be concluded that guided inquiry learning tools to improve students' mastery of physics concepts are valid, practical, and effectively used in learning