STUDY OF THE DIELECTRIC CHARACTERISTICS OF INDUSTRIAL WOOD

In the article, we consider the model of pulse signal distortion in the computer sound card channel. The use of such a model allows expanding the possibilities of using computers in the researches of the wood properties in the form of various dielectric characteristics analysis, in particular using the computer sound card channel. This makes it possible to verify the state of the signal propagation channel during the experiment. This experiment researches samples of wood for the presence of defects. Also is proposed an approach to constructing the distortion model. It allows to expand the possibilities of investigating the parameters of the pulse signal and to verification the state of the channel during the research of the dielectric properties of wood. To research, a sample of wood using a computer sound card is developed a structured scheme that allows you to analyze the characteristics of pulse signals during the measurement process. To determine the dielectric parameters of different types of industrial wood is developed the software in the MATLAB environment. Using it is analyzed complex pulse signals that used during the research. In particular, were taken into account different currents of wood polarization and dielectric characteristics.

DEVELOPMENT OF SCHOOLKIT SOFTWARE

Chemistry Department of H.S. Skovoroda Kharkiv National Pedagogical University develops a program-methodical complex (PMK) SchoolKit. It is based on three software tools: ChemKit - designed to measure temperature, electromotive force, amperage, control devices (heaters, power sources, etc.); SoundCardScientificKit - focused on the use of DAC (digital-to-analog converter) and ADC DAC (analog-to-digital converter) computer sound card; created for visualization of low-frequency signals and generation of signals of a special form; ColorKit - developed for processing photos, movies and visual data in real time for scientific purposes. This software has been tested in student and master's projects. All tools for working with visual data are divided into two categories: functions - non-specialized tools (allow to be fully creative, require some skills to work with the application, are a significant help in creating algorithms for processing visual data for the user's own software) and tools - specialized tools that simulate the operation of devices such as colorimeter, refractometer, spectrophotometer, polarimeter. To reduce the cost of projects, the paper proposes to use: digital-to-analog (DAC) and analog-to-digital (ADC) sound card converters, photo and video devices and other available peripherals in the development of digital learning tools. The paper also describes the interface and capabilities of ColorKit software. Its versatility shows that a student or teacher could build their own research system by adding and configuring macro modules. This software allows not only on the basis of visual data processing to make various measurements (colorimetric, refractometric, spectrophotometric, determination of the photosynthetic surface, etc.), but also to clearly demonstrate the principles of physicochemical devices. Peripherals for this software can be easily made by hand. Devices developed by students on the basis of ColorKit software have been repeatedly presented at various competitions: Junior Academy of Science, "Touch of Nature", "Water Net". The paper defines the main directions of applications of software ColorKit, ChemKit, SoundCardScientificKit in STEM training. Further prospects for the development of ColorKit software are outlined. The paper marks up the necessity of development of domestic educational digital laboratories and training of specialists in this field.

Design of virtual digital oscilloscope based on LabVIEW

Electrical and electronic experiment teaching is an indispensable and important part of engineering teaching. Oscilloscope is an indispensable experimental instrument in the teaching of these experiments, which is used to measure the electrical signals in the experimental process for analysis and processing. In this paper, a dual-channel virtual oscilloscope was designed based on the PC 16-bit sound card, which could correctly collect electronic signals within ±1V. Through LabVIEW graphical programming and multi-threading technology, these functions such as waveform display, channel selection control, parameter measurement and display, waveform storage and playback were realized. The innovation of this design is that it could automatically generate experimental report, simplifying the tedious operations such as drawing waveforms and filling parameters, finally quickly getting illustrated experimental report. From the test results, it can meet the requirements of daily experimental teaching, and it is of great significance to improve the quality of electrical and electronic experimental teaching.

Photoplethysmograph Portable Menggunakan Raspberry Pi

Metode non-invasive untuk memonitor fungsi jantung yang sederhana adalah Photoplethysmography. Pada tulisan ini diuraikan Photoplethysmography dengan dua sumber cahaya (reflektif dan transmitter), satu fotosensor dengan dua kali pengkondisi sinyal (double BPF). Informasi sinyal detak jantung dimodulasikan pada frekuensi audible yang dihasilkan oleh osilator (IC555 timer) kemudian dikonversi menjadi data digital oleh USB sound card (sebagai ADC). Pemrosesan sinyal dilakukan menggunakan Raspberry Pi dan sofware JavaFX. Bentuk gelombang PPG, pulse, meanRR, sdRR, rMSSD, pNN50 dapat ditampilkan pada layar LCD 5 inch. Gelombang PPG morfologinya sama dengan gelombang ABP, dengan akuisi sinyal yang tepat, PPG menawarkan hal baru untuk manajemen penanganan PAD pada penderita diabetes militus, gagal ginjal dan usia lanjut. Dengan alat ini, detak jantung dapat dihitung dengan presentase kesalahan 0.098%. Pada display dapat ditampilan grafik gelombang yang menyerupai dengan bentuk gelombang masukan dan menjadi masa depan untuk pengganti ABP. Perbandingan pengukuran detak jantung antara alat dengan pulse oximetry menunjukan deviasi antara 0.1 - 0.4. A simple non-invasive method for monitoring cardiac function is Photoplethysmography. This paper describes Photoplethysmography with two light sources (reflective and transmitter), one photosensor with two signal conditioners (double BPF). The heart rate signal information is modulated at an audible frequency generated by the oscillator (IC555 timer) then converted into digital data by the USB sound card (as an ADC). Signal processing is performed using Raspberry Pi and JavaFX software. PPG, pulse, meanRR, sdRR, rMSSD, pNN50 waveforms can be displayed on the 5 inch LCD screen. The PPG wave is morphologically the same as the ABP wave, with precise signal acquisition, PPG offers a novelty for the management of PAD in people with diabetes mellitus, kidney failure and the elderly. With this tool, the heart rate can be calculated with an error percentage of 0.098%. On the display can be displayed a wave graph that resembles the input waveform and is a future for ABP replacement. Comparison of heart rate measurements between the device and pulse oximetry shows a deviation between 0.1 - 0.4.

An introduction to the Objective Psychophysics Toolbox (o_ptb)

The Psychophysics Toolbox (PTB) is one of the most popular toolboxes for the development of experimental paradigms. It is a very powerful library, providing low-level, platform independent access to the devices used in an experiment such as the graphics and the sound card. While this low-level design results in a high degree of flexibility and power, writing paradigms that interface the PTB directly might lead to code that is hard to read, maintain, reuse and debug. Running an experiment in different facilities or organizations further requires it to work with various setups that differ in the availability of specialized hardware for response collection, triggering and presentation of auditory stimuli. The Objective Psychophysics Toolbox (o_ptb) provides an intuitive, unified and clear interface, built on top of the PTB that enables researchers to write readable, clean and concise code. In addition to presenting the architecture of the o_ptb, the results of a timing accuracy test are presented. Exactly the same Matlab code was run on two different systems, one of those using the VPixx system. Both systems showed sub-millisecond accuracy.

Rancangan Bangun Alat Perekam Suara Ikan di Dalam Laut

Pengembangan alat pemanggil ikan dengan suara ikan khususnya pada perikanan bagan (liftnet) dilaksanakan untuk merekam suara ikan sendiri dan diimplementasikan pada alat pemanggil ikan sehingga akan menciptakan alat bantu penangkapan ikan yang efesien dan ramah lingkugan dalam meningkatkan hasil tangkapan Tujuan mendesain alat perekaman suara ikan di laut khususnya ikan teri dan diharapkan memperoleh rekaman suara ikan yang dapat dipergunakan untuk memanggil ikan yang efesien dan ramah lingkungan. Desain alat perekam suara yang dibuat dimuali dari kepala rekam kedap air, pre amp, sound card dan komputer sebagai tempat penyimpanan hasil rekaman dan sekaligus pengolah suara. Konsumsi daya 1 watt pada tegangan listrik 12 volt 7 ampere dc dapat bekerja selama 80 jam tanpa henti. Hasil rekaman yang diperoleh mengatakan terdapat 8 jenis suara ikan dengan amplitude dan frekuensi yang berbeda-beda.

Pengembangan Sound Card Laptop sebagai Alat Praktikum Fisika untuk Penentuan Percepatan Gravitasi Bumi

Tujuan dari penelitian ini adalah untuk mengembangkan soundcard laptop sebagai alat praktikum fisika untuk penentuan percepatan grafitasi bumi. Gaya gravitasi bumi adalah kekuatan yang membuat bumi menarik objek ke pusatnya. Alat ini didesain menggunakan 3 buah lilitan koil tembaga yang dipisahkan oleh jarak tertentu. Data yang diperoleh disajikan dalam bentuk waktu (t) yang dihitung dari gejala induksi oleh magnet yang melalui lilitan. Ketika magnet dijatuhkan, waktu diukur dari munculnya pulsa ketika magnet menginduksi lilitan dengan menggunakan software audacity. Dari pulsa tersebut memunculkan hasil waktu pada masing-masing jarak lilitan. Penelitian ini menggunakan metode pengembangan dengan Analysis, Design, Development, Implementation, Evaluation (ADDIE). Alat praktikum soundcard laptop divalidasi oleh ahli alat untuk aspek teknis dan mahasiswa sebagai uji pengguna. Teknik pengumpulan data pada penelitian ini menggunakan angket. Angket digunakan untuk mengukur kelayakan pengembangan alat praktikum soundcard laptop. Angket diberikan kepada 3 ahli alat praktikum dan mahasiswa sebagi pengguna. Analisis validasi angket menggunakan skala likert dengan rentang nilai 1 sampai 5. Hasilnyan didapakan alat praktikum yang memiliki akurasi pengukuran perceptan grafitasi yang baik dengan error 2,33%. Sedangkan hasil dari validasi menunjukkan bahwa kedua validasi memberikan responyang sangat baik sehingga, alat praktikum soundcardlaptop dapat digunakan Praktikum.