This study demonstrated that the constant average speed of a dynamic car could be measured and calculated using the smartphone magnetometer. The apparatus setup was built using a dynamic car, a linear track up to 1.50 m, a bunch of magnets, and a smartphone magnetometer application. The smartphone magnetometer application, ‘Physics Toolbox Suite’, was free for the experiment. The magnet and smartphone magnetometer were attached on a linear track and dynamic car, respectively. When the dynamic car are moving on the car track, the smartphone magnetometer will measure the magnetic field value versus the time relation. The magnetic field value will fluctuate, increasing when close to the magnet or decrease when the distance from the magnet increases. The magnetic field properties (peaks time) versus the magnet distance position were analyzed using linear fitting, and we find the average speed of the dynamic car. We hope that this magnetometer experiment will be valuably used in general physics laboratories.

In this paper, we report on a homemade optical spectrometer using diffraction grating and image processing techniques. This device was designed to produce spectral images that could then be processed by measuring signal strength (pixel intensity) to obtain the light source, transmittance, and absorbance spectra of the liquid sample. The homemade optical spectrometer consisted of: (i) a white LED as a light source, (ii) a cuvette or sample holder, (iii) a slit, (iv) a diffraction grating, and (v) a CMOS camera (webcam). In this study, various concentrations of a carbon nanoparticle (CNP) colloid were used in the particle size sample test. Additionally, a commercial optical spectrometer and tunneling electron microscope (TEM) were used to characterize the optical properties and morphology of the CNPs, respectively. The data obtained using the homemade optical spectrometer, commercial optical spectrometer, and TEM showed similar results and trends. Lastly, the calculation and measurement of CNP size were performed using the effective mass approximation (EMA) and TEM. These data showed that the average nanoparticle sizes were approximately 2.4 nm and 2.5 ± 0.3 nm, respectively. This research provides new insights into the development of a portable, simple, and low-cost optical spectrometer that can be used in nanomaterial characterization for physics undergraduate instruction.

This study aims to determine the implementation of the learning problem-solving laboratory model and improvement of critical thinking skills of students on temperature and heat topic. The method used in this research was pre-experiment, with one-group pretest-posttest design. The population of this study was class X SMA Muhammadiyah 1 Garut. The sample was selected by random sampling technique, with a sample of one class X-2, amounting to 30 people. The implementation of problem-solving laboratory model learning was observed by observers with observation sheets and improvement of students' critical thinking skills measured by essay tests. The results showed that the average implementation of problem-solving laboratory model learning for teacher activities was 84% and student activities at 80% were both categorized well. There was an increase in the critical thinking skills of students shown by the average of the normalized gain value of 0.64 include the medium category. Thus, the problem-solving laboratory model learning can be used as an alternative in improving students' critical thinking skills on the topic of temperature and heat.

Polyacrylonitrile (PAN) fibers with average diameters in the range 100 nm with beaded morphology were prepared by a constant current electrospinning system. The fiber morphology could be easily varied by controlling the flow rate and electric current during the electrospinning process without changing the precursor solution. It was found that the use of lower flow rates resulted in more beaded fibers while the number of beads increases. The electric current could control the fiber morphology in which the beaded number (the number of beads or the beaded fibers) decreased as the electric current increased. It was also found that diameter and length of the beaded fibers increases as the electric current increases. Therefore, these results are able to be applied to find optimal conditions in obtaining high performance filter media.

The integration of Islamic values in the learning process at UIN Sunan Gunung Djati Bandung has become the hallmark of the campus. The Islamic values integrated into the learning process by providing the verses from the Quran for the concepts studied. The aim of this study is to analyse the ability of students used to live in an Islamic boarding school (pesantren) and those who haven’t yet live in an Islamic boarding school in identifying the verses of al-Quran related to some concept of physics. The research was conducted through observation in classrooms and  analysis of students’ assignment on identifying. The results showed that generally students have a decent ability in identifying Qur'anic verses related to the concept of physics. The students' ability appeared not to be influenced by the pesantren educational background. However, largely students are not able to interpret the verses of the Qur'an related to the physics concept in depth. AbstrakIntegrasi nilai-nilai Islam dalam proses pembelajaran di UIN Sunan Gunung Djati Bandung telah menjadi ciri khas kampus. Integrasi nilai-nilai Islam ke dalam proses pembelajaran dapat dilakukan dengan menghubungkan ayat-ayat al-Quran dengan konsep-konsep yang dipelajari. Penelitian ini bertujuan untuk menganalisis kemampuan mahasiswa Prodi Pendidikan Fisika yang pernah tinggal di pesantren dan yang tidak pernah tinggal di pesantren dalam mengidentifikasi ayat-ayat al-Quran terkait dengan konsep fisika. Penelitian dilakukan melalui observasi di ruang kelas dan analisis tugas yang dikumpulkan dari mahasiswa ketika mengidentifikasi ayat-ayat Al-Qur'an yang berkaitan dengan konsep  fisika. Hasil penelitian menunjukkan umumnya mahasiswa memiliki kemampuan yang layak dalam mengidentifikasi ayat-ayat Al-Qur'an yang berkaitan dengan konsep fisika.  Kemampuan mahasiswa tersebut tidak dipengaruhi oleh latar belakang pendidikan di pesantren. Namun, sebagian besar mahasiswa tidak mampu menafsirkan ayat-ayat Al Qur'an yang terkait dengan konsep fisika secara mendalam.

A bright red emission of manganese-doped BCNO (BCNO:Mn) phosphor was firstly synthesized by solid state method.

The purpose of this study is to discover the improvement in students’ problem solving abilities after learning activities through a simple harmonic motion experiment method using an accelerometer sensor on an smartphone and revealing student responses on it. Pre-experimental research design with one group pretest-posttest design was used in the study. The samples in this study were students of Class X IPA 1 of SMAN 1 Cilimus Kuningan, West Java. Data on the improvement of students’ problem solving abilities were obtained through an essay test while the student’s response data was obtained through the distribution of response questionnaires. The results showed that the problem-solving ability experienced by students increased in the moderate category. Whereas, the results of the responses of students showed that most of the students responded positively to the learning activities of the sensor accelerometer on this smartphone. So, experiment with smartphone has a potential for improving students problem solving skills.

An antibacterial nanofibrous membrane has been successfully synthesized using electrospinning method. Polyacrylonitrile (PAN) was used as the primary material due to its beneficial properties: great spinnability and insolubility in water, allowing potential application in water purification. Chitosan was composited in the fiber structure and was expected to inhibit bacterial growth on the membrane surface as a consequence of biofouling. Various Chitosan amounts were used with the following mass ratio of PAN/Chitosan: 20/1, 10/1, and 5/1. Scanning Electron Microscopy (SEM) was performed to assess morphology and diameter of the nanofibrous membrane. Flux test was carried out on all membrane variation in comparison with membrane filter for High Performance Liquid Chromatography (HPLC) as the reference. Filtration efficiency of the membranes was performed towards suspension containing P. aeruginosa and S. epidermidis with respective concentration of 3.02 × 107 and 2.89 × 107 cell/mL. SEM analysis showed uniform strands of PAN fiber composited with Chitosan particles. PAN/Chitosan membrane demonstrated ability to reduce bacterial concentration following the filtration process. Significant decrease of bacterial concentration resulted from filtration using PAN/Chitosan membrane was obtained. In addition, characterization and analysis of filtration efficiency indicated that PAN/Chitosan nanofibrous membrane would be suitable for applications of water purification with antibacterial activity.