Development creativity of grade 5 students on electricity through STEM education

The research aim was to develop creativity of grade 5 students through STEM education in electricity. There were 15 students of Grade 5 in Khon Kaen Province in 2020 participated in this study. The action research was implemented to this study with three loops of action research to improve creativity of students. The physics contents consisted of simple circuit, conductor, insulator, switch, connecting battery in a series circuit and a parallel circuit, series and parallel circuit and the motor connection. The fifteen lessons were separated into three loops of actions. Each loop of lessons consisted of three Predict-Observe-Explain (POE) lessons, and a lesson which is an Engineering design process lesson for designing product to improve student’s creativity in electricity. The students were fluent in designing various tasks to solve problems arising from a given classroom situation and had flexibility and elaboration in given reasons in selecting the materials to create the works. At the last lesson of the each action loops the data was collected to show how students improved their creativity. The student’s work and their presentation were evaluated by the creativity’s rubric scores in four dimensions of Originality, Fluency, Flexibility and Elaboration. The results show that student’s creativity were improve by STEM education in electricity. All dimension of creativity which are originality, fluency, flexibility and elaboration were improved from loop 1 to loop 3 of action research.

An Industrial B-Mode Phased Array Ultrasonic Imaging Reconstruction Algorithm Based on FRI Sampling

Firstly, a novel FRI sampling model has been proposed according to the characteristics of ultrasonic signals. The model has the advantages such as good stability, strong antinoise ability, simple circuit implementation, and fewer preconditions, compared to the traditional methods. Then, in order to verify the validity of the sampling model, the method is applied to B-type ultrasonic imaging, and a B-type phased array ultrasonic imaging algorithm based on FRI sampling model is proposed. Finally, the algorithm simulation experiment is designed, and the results show that the sampling point required by the proposed FRI sampling model is only 0.1% of the traditional B-type phased array ultrasonic imaging method, and the sampling frequency of the proposed ultrasonic imaging algorithm is only 0.0077% of the traditional B-type ultrasonic imaging method. Additionally, the experiment result indicates that this algorithm is more applicable to phased array ultrasonic imaging than the SOS filter is.

Engineering a dynamic, controllable infectivity switch in bacteriophage T7

Transcriptional repressors play an important role in regulating phage genomes. Here, we examined how synthetic regulation based on repressors can be to create a dynamic, controllable infectivity switch in bacteriophage T7. We engineered T7 by replacing a large region of the early phage genome with combinations of ligand-responsive promoters and ribosome binding sites (RBS) designed to control the phage RNA polymerase. Phages with the engineered switch showed virulence comparable to wildtype when not repressed, indicating the phage can be engineered without a loss of fitness. When repressed, the most effective switch used a TetR promoter and a weak RBS, resulting in a two-fold increase in latent period (time to lyse host) and change in phage titer. Further, phage activity could be tuned by varying inducer concentrations. Our study provides a proof of concept for a simple circuit for user control over phage infectivity.

Functional Capabilities of Coupled Memristor-Based Reactance-Less Oscillators

New functionalities of reactance-less memristor based oscillators are discussed which arise when two elementary oscillators are connected. It is shown that the system of coupled memristor based oscillators can be used for converting analog and analog-digital signals into binary pulse sequences. The approach to control the thresholds in memristor based oscillators is discussed. Standard control approach in memristor based oscillators is the exploitation of input signal to drive the rate of change in the state of the memristor. In contrast, the main idea of the considered controlling approach is to send the input signal not directly to the memristor device but to the comparator circuit and as result to control oscillator circuit behavior by change of interval of memristor resistor variation. The capabilities of coupled memristor based oscillators with control thresholds are sufficient for constructing the simple circuit elements of oscillatory computing architectures.

Dampak Latihan Simple Circuit dan Running Circuit Terhadap Peningkatan Daya Tahan Kardiovaskular Dan Kelelahan

Metode latihan simple circuit dengan running circuit dalam penelitian ini bertujuan untuk mengetahui peningkatan daya tahan kardiovaskular dan kelelahan. Metode penelitian yang digunakan adalah eksperimen. Desain penelitian yang dugunakan adalah two-group pre-test-post-test design. Subjek dalam penelitian ini adalah mahasiswa putra tingkat empat semester genap tahaun ajaran 2019-2020.Teknik pengambilan sampel adalah teknik stratified random sampling. Instrument yang digunakan dalam penelitian ini adalah multi-stage fitness test (MSFT) untuk tes daya tahan kardiovaskular (vo2max) dan flamingo balance tes. Uji analisis data menggunakan uji hipotesis yaitu paired sample t-test. Hasil penelitian diperoleh persentase peningkatan daya tahan kardiovaskular pada metode latihan simple circuit sebesar 2.06%, Persentase peningkatan daya tahan kardiovaskular pada metode latihan running circuit sebesar 15.02%. Sedangkan hasil penelitian kelelahan pada metode simple circuit sebesar 22.36%, Persentase peningkatan kelelahan pada metode latihan running circuit sebesar 9.58%. Kesimpulannya adalah metode latihan simple circuit dan running circuit berpengaruh secara signifikan terhadap daya tahan kardiovaskular, sedangkan pada variabel kelelahan meningkat secara negatif. Penulis menyarankan agar adanya penelitian lanjutan bagian durasi pemberian latihan pada ke-dua metode latihan tersebut agar hasil penelitian yang didapatkan lebih baik.This research aims to determine the simple circuit training method with running circuits to increase cardiovascular endurance and fatigue. The research method used was experimental. The research design used was a two-group pre-test-post-test design. The study was male students in the fourth semester of the 2019-2020 academic year. The sampling technique used was the stratified random sampling technique. The instruments used in this research were the multi-stage fitness test (MSFT) for the cardiovascular endurance test (vo2max) and the flamingo balance test for fatigue. Test data analysis using hypothesis testing, namely paired sample t-test. The results showed that increased cardiovascular endurance in the simple circuit training method was 2.06%; the percentage of increased cardiovascular endurance in the running circuit training method was 15.02%. While fatigue research results on the simple circuit method were 22.36%, the rate of increased fatigue in the running circuit training method was 9.58%. The conclusion is the simple circuit training method and running circuit have a significant effect on cardiovascular endurance, while the fatigue variable increases negatively. The author suggests that there should be further research on the duration of giving exercise in both training methods. The research results obtained are better.

Impact of flux gap upon dynamic resistance of a rotating HTS flux pump

HTS flux pumps enable superconducting currents to be directly injected into a magnet coil without the requirement for thermally inefficient current leads. Here, we present results from an experimental mechanically rotating HTS flux pump employing a coated-conductor stator and operated at 77 K. We show the effect of varying the size of the flux gap between the rotor magnets and coated conductor stator from 1 to 7.5 mm. This leads to a corresponding change in the peak applied perpendicular magnetic field at the stator from approximately 350 to 50 mT. We observe that our experimental device ceases to maintain a measurable output at flux gaps above 7.5 mm, which we attribute to the presence of screening currents in the stator wire. We show that our mechanically rotating flux pump is well described by a simple circuit model which enables the output performance to be described using two simple parameters, the open-circuit voltage Voc and the internal resistance, Rd. Both of these parameters are found to be directly proportional to magnet-crossing frequency and decrease with increasing flux gap. We show that the trend in Rd can be understood by considering the dynamic resistance experienced at the stator due to the oscillating amplitude of the applied rotor field. We adopt a literature model for the dynamic resistance within our coated-conductor stator and show that this gives good agreement with the experimentally measured internal resistance of our flux pump. This is the Accepted Manuscript version of an article accepted for publication in 'Superconductor Science and Technology". IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/0953-2048/28/11/115008.

Impact of flux gap upon dynamic resistance of a rotating HTS flux pump

HTS flux pumps enable superconducting currents to be directly injected into a magnet coil without the requirement for thermally inefficient current leads. Here, we present results from an experimental mechanically rotating HTS flux pump employing a coated-conductor stator and operated at 77 K. We show the effect of varying the size of the flux gap between the rotor magnets and coated conductor stator from 1 to 7.5 mm. This leads to a corresponding change in the peak applied perpendicular magnetic field at the stator from approximately 350 to 50 mT. We observe that our experimental device ceases to maintain a measurable output at flux gaps above 7.5 mm, which we attribute to the presence of screening currents in the stator wire. We show that our mechanically rotating flux pump is well described by a simple circuit model which enables the output performance to be described using two simple parameters, the open-circuit voltage Voc and the internal resistance, Rd. Both of these parameters are found to be directly proportional to magnet-crossing frequency and decrease with increasing flux gap. We show that the trend in Rd can be understood by considering the dynamic resistance experienced at the stator due to the oscillating amplitude of the applied rotor field. We adopt a literature model for the dynamic resistance within our coated-conductor stator and show that this gives good agreement with the experimentally measured internal resistance of our flux pump. This is the Accepted Manuscript version of an article accepted for publication in 'Superconductor Science and Technology". IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/0953-2048/28/11/115008.