scholarly journals Propeller Clock using Arduino Nano Micro-controller

2021 ◽  
Vol 9 (11) ◽  
pp. 1270-1273
Author(s):  
Manish M
Keyword(s):  
Mechanical Engineering ◽  
Special Kind ◽  
Visual Persistence ◽  
Circular Path ◽  
Two Dimensional ◽  
Single Row ◽  
Display Devices ◽  
Human Eye ◽  
Persistence Time ◽  
Scientific Phenomena

Abstract: Once John Lubbock rightfully propounded, “What we see depends mainly on what we look for”. Perfection is a just a illusion whereas Perception is the real vision. This “illusion” is based on inertia of human eye. Propeller clock is a special kind of circular LED display. It is making use of POV, a scientific phenomena termed as ‘Persistence of Vision’, which means that if something appears in the same spot consistently, at least 50-60 times per second, our brains think that it’s permanently there when it is not. The term ‘Persistence of Vision display’ or ‘POV display’ has been used for LED display devices that compose images by displaying one spatial portion at a time in rapid succession (for example, one column of pixels every few milliseconds). A two-dimensional POV display is often accomplished by means of rapidly moving a single row of LEDs along a linear or circular path. The effect is that the image is perceived as a whole by the viewer as long as the entire path is completed during the visual persistence time of the human eye. A further effect is often to give the illusion of the image floating in mid-air. This implementation will be a coordination of electrical, electronics and mechanical engineering. Keywords: Persistence of Vision, Arduino Nano, Micro-controller, Led’s, Propeller, POV

Visual Perception of Bending Motion

Perception ◽  
1973 ◽  
Vol 2 (3) ◽  
pp. 321-326 ◽  
Author(s):  
G Jansson ◽  
G Johansson
Keyword(s):  
Visual Perception ◽  
Rigid Motion ◽  
Special Kind ◽  
Rotary Motion ◽  
Two Dimensional ◽  
Form Change ◽  
Perceptual Preference

Principles of the perception of a special kind of partially rigid motion—bending motion—are explored. The proximal stimuli consisted of an outline quadrangle with various combinations of changes of length and direction of the four sides. The result demonstrated a perceptual preference for rotary motion over bending motion, and of bending motion over two-dimensional form change (stretching). The principle of minimum object change can predict this result, implying that rotation, bending, and stretching are perceptually preferred in this order.

On two-dimensional via assignment for single-row routing

1988 ◽  
Vol 37 (6) ◽  
pp. 721-727 ◽  
Author(s):  
H.C. Du ◽  
O.H. Ibarra ◽  
J.F. Naveda
Keyword(s):  
Two Dimensional ◽  
Single Row

scholarly journals About the calculation of hypergeometric function F4 (1,2;2,2; z1, z2 ) by the branched continued fraction of a special kind

2021 ◽  
pp. 86-90
Author(s):  
Volodymyr Hladun ◽  
Nataliya Hoyenko ◽  
Levko Ventyk ◽  
Oleksandra Manziy
Keyword(s):  
Hypergeometric Function ◽  
Continued Fraction ◽  
Hypergeometric Series ◽  
Complex Space ◽  
Special Kind ◽  
Partial Sums ◽  
Two Dimensional ◽  
Explicit Formulas ◽  
Recurrent Relations ◽  
Branched Continued Fraction

In the paper, using some recurrent relations, the expansion of the hypergeometric Appel function F4 (1,2;2,2; z1, z2 ) into a branched continued fraction of special form is constructed. Explicit formulas for the coefficients of constructed development are obtained. The structure of the obtained branched continued fraction is investigated. The values of the suitable fractions and the corresponding partial sums of the hypergeometric series at different points of the two-dimensional complex space are calculated. A comparative analysis of the obtained values is carried out, the results of which confirm the efficiency of using branched continued fractions to calculate the values of the hypergeometric function F4 (1,2;2,2; z1, z2 ) in space C2.

Die Röntgenologie im Licht der Evolutionären Erkenntnistheorie

2017 ◽  
Vol 142 (25) ◽  
pp. 1943-1948
Author(s):  
Paul Gelinsky
Keyword(s):  
Visual Perception ◽  
Clinical Data ◽  
Essential Role ◽  
A Priori ◽  
Two Dimensional ◽  
X Ray ◽  
Human Eye ◽  
Laboratory Values ◽  
Projection Radiography

AbstractAn X-ray photograph is not adapted to the human a priori intuition: it is not colored, it is two-dimensional, has no depth and no perspective. A radiograph is composed by about 100 gradations of grey, of which the human eye cannot resolve more than 30. Projection radiography has a cardinal problem: the superposition of normal and pathological structures. Apart from visual physiology, visual psychology plays an essential role in diagnosis: expectation and stereotyped thinking influence the interpretation of visual perception. X-ray findings are to be compared with anamnesis, laboratory values, clinical data and always with good judgement – this was already known in 1913. Plato sketched a cave analogy that describes the difficulties of interpreting „shadows“ – with very interesting parallels to radiology.

A Simulated Annealing-Based Approach to Three-Dimensional Component Packing

1995 ◽  
Vol 117 (2A) ◽  
pp. 308-314 ◽  
Author(s):  
S. Szykman ◽  
J. Cagan
Keyword(s):  
Simulated Annealing ◽  
Mechanical Engineering ◽  
Three Dimensional ◽  
Layout Optimization ◽  
Vlsi Circuits ◽  
Two Dimensional ◽  
Optimal Solutions ◽  
Engineering Applications ◽  
Component Layout ◽  
General Component

This paper introduces a simulated annealing-based approach to three-dimensional component packing that employs simulated annealing to generate optimal solutions. Simulated annealing has been used extensively for two-dimensional layout of VLSI circuits; this research extends techniques developed for two-dimensional layout optimization to three-dimensional problems which are more representative of mechanical engineering applications. This research also provides a framework in which to solve general component layout problems.

Imaging Transfer Devices Operated by PSD Mode a-Si P-I-N Junctions

1989 ◽  
Vol 149 ◽  
Author(s):  
M. Yamaguchi ◽  
S. Murakami ◽  
S. Todo ◽  
Y. Tawada
Keyword(s):  
Image Sensor ◽  
Two Dimensional ◽  
Key Factors ◽  
Large Area ◽  
One Dimensional ◽  
Display Devices ◽  
Advantages And Disadvantages ◽  
Position Sensitive ◽  
Deposition Techniques

ABSTRACTTwo types of position sensitive device (PSD) using a-Si:H thin films have been developed. One has been produced by large area plasma CVD, with usual metal deposition techniques. The other is the application of a linear image sensor as a one dimensional position sensor. There are some advantages and disadvantages in these two types of position sensitive device. Resolution of the linear image sensor is limited by the size of the elements and the pitch; in contrast, uniformity of the electrodes on the p-i-n diode and thickness of the a-Si thin film are the key factors for the resolution of one and two dimensional analogue PSDs.The analogue PSD is applicable to a digitizer which takes the role of a man-machine (computer) interface. The large area two dimensional digitizer was fabricated using the same technique as large area solar cell production, and was shown to be useful as a drawing tool on a CRT or other display devices with the aid of a micro-computer.

Stimulus Structure in Visual Persistence: An Examination of Selective Adaptation Effects on Phenomenal Continuity

1984 ◽  
Vol 58 (2) ◽  
pp. 663-670 ◽  
Author(s):  
Barbara Burns
Keyword(s):  
Test Stimulus ◽  
Excellent Agreement ◽  
Iconic Memory ◽  
Selective Adaptation ◽  
Visual Persistence ◽  
Two Dimensional ◽  
Adaptation Effects

The effects of adaptation by stimuli composed of the dimensions of color, orientation and size were measured on the visual persistence of a red vertical 3.5 c/d grating. Adaptation by the stimulus that shared an identical level on each of the three-component dimensions of the test stimulus decreased the visual persistence of the test stimulus. There was no effect of adaptation on visual persistence when the adapting stimulus and test stimulus shared an identical level on zero-, one-, or two-dimensional components. The present results extend the investigation of selective adaptation effects on visual persistence by Meyer, Lawson, Cohen, and Maquire to color, size and orientation. In addition, these results are in excellent agreement with Burns' finding that physically integral stimuli are represented in iconic memory as integral unitary wholes and not as dimensional components.

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