The influence of computer graphics on the traditional styles` developing and the emerging of new art styles

The paper studies the history of the development of digital technologies according to the growing possibilities of computer graphics. We consider the influence of computer technologies on graphics in retrospect starting from the middle of the last century to the present day: from drawing on an oscilloscope screen using light pens to creating complete interfaces; from the use of the first computers to the technology of generating three-dimensional images in real time. The study pays attention to such types of image representation as vector, raster, fractal and three-dimensional graphics and highlights the differences between them as well as the ways, methods and areas of application. We demonstrate how the progress in the field of technical means influences traditional forms of art and on the emergence of completely new art forms: pixel art, low poly art etc. The paper also dwells on generative art, three-dimensional sculpture, net-graphics, video art and other areas.

VISUALISASI KARAKTER GELOMBANG LISSAJOUS PADA OSILOSKOP MENGGUNAKAN SPREADSHEET MICROSOFT EXCEL PADA PEMBELAJARAN FISIKA

VISUALIZATION OF LISSAJOUS WAVE CHARACTER IN OSCILLOSCOPE USING SPREADSHEET MICROSOFT EXCEL IN PHYSICS LEARNING AbstractThis study examines the visualization of the creation and operation of lissajous waves on the oscilloscope screen using a spreadsheet on Microsoft Excel 2013. The purpose of this research is to produce a visualization and how to operate lissajous waves using Microsoft Excel. The subject of this research is a spreadsheet program on Microsoft Excel software. Research location in the Yogyakarta State University Postgraduate Program building. The results of the study are expected to produce a visualization of how and how to operate a lissajous wave using Microsoft Excel. The data used uses fixed amplitude, frequency ratio 1:1 (a=1, b=1) with different phases at special angles ie 0o, 30o, 60o dan 90o. As well as other data with different frequency comparisons but using fixed amlitudes and phase differences of 90o. Comparison of frequency, amplitude and phase difference has the main role in forming lissajous wave patterns. It can be concluded that the speadsheets program on Microsoft Excel 2013 can be used to create simulations and describe lissajous wave patterns on oscilloscope screens in physics learning. Through simulation of lissajous wave patterns using spreadsheets on Microsoft Excel can make it easier for students and teachers to understand the lissajous curve on the oscilloscope screen. AbstrakPenelitian ini mengkaji tentang visualisasi pembuatan dan pengoperasian gelombang lissajous pada layar osiloskop menggunakan spreadsheet pada microsoft excel 2013. Tujuan penelitian menghasilkan visualisasi dan cara pegoperasian gelombang lissajous menggunakan microsoft excel. Subjek penelitian ini adalah program spreadsheet pada software microsoft exel. Lokasi penelitian di gedung Program Pascasarjana Universitas Negeri Yogyakarta. Hasil penelitian diharapkan dapat menghasilkan visualisasi pembuatan dan cara pegoperasian gelombang lissajous menggunakan microsoft excel. Data yang digunakan menggunakan amplitudo tetap, perbandingan frekuensi 1:1 (a=1, b=1) dengan beda fase pada sudut istimewa yaitu 0o, 30o, 60o dan 90o. Serta data lain dengan perbandingan frekuensi yang berbeda namun menggunakan amlitudo tetap dan beda fase sebesar 90o. Perbandingan frekuensi, amplitudo dan beda fase memiliki peran utama dalam pembentukkan pola gelombang lissajous. Dapat disimpulkan bahwa program speadsheets pada miscrosoft excel 2013 dapat digunakan untuk membuat simulasi dan menggambarkan pola gelombang lissajous pada layar osiloskop dalam pembelajaran fisika. Melalui simulasi pola gelombang lissajous menggunakan spreadsheets pada microsoft excel dapat memudahkan siswa maupun guru dalam memahami kurva lissajous pada layar osiloskop.

Design of Combinational Logic Circuit Prober

The objective of this paper is to design and implement a logic circuit prober to display truth tables of a three input combinational logic circuit. The truth table is to be as “1” and “0” on an ordinary 60 MHz oscilloscope. This paper meets this objective by using Lissajous Patterns to plot a “0” or a “1” on the oscilloscope screen. To plot a “0” on the oscilloscope screen, two sinusoidal signals in quadrature are supplied to the two inputs of the oscilloscope with the scope set to X-Y mode. To plot a “1” on the oscilloscope, only the signal to the Y input is allowed to reach the oscilloscope screen. To display all the 32 patterns required to obtain a three input truth table, two staircase waveforms are employed. The staircase waveforms, one eight-step and the other four-step, are added to the two sinusoidal signals to shift the patterns along the X and Y directions to produce all the 32 patterns.

SET-UP OF A KUNDT’S TUBE TO OBTAIN THE SPEED OF SOUND AT DIFFERENT TEMPERATURES.

In this work we describe how we designed and built an acoustic system that allowed us to adapt a Kundt’s tube for the measurement of the speed of sound at different temperatures. The air column inside the tube was excited by a speaker at a frequency of 2 kHz. We changed the air column length by moving a piston throughout the tube, and we measured and recorded that length when we observed a resonance signal on the oscilloscope screen. This procedure was repeated at different temperatures, ranging from 19○C to 115○C. Then it was calculated the propagation of the speed of sound based on the temperature. The results were compared with those predicted by the classical model, which assumes that air is an ideal diatomic gas, and that the acoustic phenomenon is an adiabatic process. Finally, it was found a satisfactory agreement between the experimental values and those predicted by the classical model

The Designing of Data Acquisition Card through PIC18F4550 and an Interface Study

Since automatic control is used in every field, there is almost no industrial application system which doesn’t employ the sensors. It makes correctly reading the data obtained from sensors in the system with sensors and transmitting this data into the computer more important. In this executed study, a design for an interface which can be easily used with a low cost data processing card and with flexible structure was performed. In the executed system, the PIC18F4550 microcontroller was used and data can be accurately read from 10 different channels. The data read from the designed data acquisition card was transferred into a computer interface program prepared in C# program using a USB and recorded into the database in the Microsoft Access program. The designed interface, the values of read signals and their graphs may be displayed on the screen. Thus, the interface screen may be used as both an indicator and oscilloscope screen.

A test for multiplication in insect directional motion detectors

The H1 neuron is a directionally sensitive motion-detector neuron with a large field that is fed by many high-resolution motion detectors in the fly optic lobe. As a stimulus pattern for it we used a random pattern of 50% bright and 50% dark squares on an oscilloscope screen. When this pattern is jumped by a small increment the HI neuron gives a directional response. When the jump is greater than one pixel on the screen the response falls and becomes non-directional because jump direction can no longer be inferred. When the contrast is reversed at the jump, the response is the same for both directions, and is the same as when the contrast is reversed without motion. For the motion receptors this represents a nondirectional ‘on’ or ‘off’ response. The result is discussed with reference to theories of motion perception.

Manual Tracking Performance in Patients with Cerebellar Incoordination: Effects of Mechanical Loading

ABSTRACT:Manual tracking performance was studied in five patients with cerebellar incoordination due to unilateral cerebellar hemisphere lesions. The subjects were required to track a target on an oscilloscope screen by moving a cursor controlled by flexion-extension movements of the wrist. In comparison to normal subjects, the cerebellar patients, using their clinically affected arm, demonstrated irregular tracking patterns with inappropriate accelerations and decelerations, numerous high velocity peaks of movement, and an increased time lag between the cursor and the target.The addition of a viscous load provided by feeding back wrist velocity to a torque motor coupled to the apparatus resulted in significant improvement in tracking performance and suppression of the high velocity peaks. Increasing elastic stiffness by feeding back wrist position or inertial load by adding weights to the hand did not improve performance on this task. It is proposed that a hypotonic cerebellar limb behaves like an underdamped mechanical system. The addition of viscous loads helps restore more normal damping during voluntary movements of the arm.

Three-Dimensional Ultrasonic Scanning

Simple experiments which form the basis for a true 3-D demonstration of sectional images are presented and a method for genuine 3-D display of dynamic ultrasound images is described. Eight ultrasound images are recorded with a slightly different angulation of the transducer. The images are extracted from the video signal from a conventional ultrasound scanner and stored in eight digital memories. After recording, each image is displayed on an oscilloscope screen, which is viewed via a fast oscillating mirror. The position of the mirror determines which of the eight images are to be displayed and thereby ensures a correct spatial relationship of the images, resulting in a true 3-D scan presentation.