Essentially Non-periodic Processes

2010 ◽  
pp. 295-303
Author(s):  
Valery N. Pilipchuk
Keyword(s):  
Periodic Processes

scholarly journals Modelling and forecasting of quasi-periodic processes in technical objects based on cylindrical image models

2019 ◽  
pp. 387-393
Author(s):  
V R Krasheninnikov ◽  
Yu E Kuvayskova
Keyword(s):  
Time Series ◽  
Technical Condition ◽  
The State ◽  
Effective Management ◽  
Hydraulic Unit ◽  
Forecasting Models ◽  
Periodic Processes ◽  
Image Models ◽  
Accuracy Of Prediction ◽  
Modelling And Forecasting

Accurate forecasting of the state of technical objects is necessary for effective management. The technical condition of the object is characterized by a system of time series of monitored indicators. The time series often have difficultly predictable irregular periodicity (quasi-periodicity). In this paper, to improve the accuracy of such series forecasting, models of quasi-periodic processes in the form of samples of a cylindrical image are used. The application of these models is demonstrated by forecasting of a hydraulic unit vibrations. It is shown that the use of these models provides a higher accuracy of prediction compared with the classical approaches.

Development of the Intestinal Tract during the Larval Period of Drosophila

Development ◽  
1957 ◽  
Vol 5 (2) ◽  
pp. 134-142
Author(s):  
H. H. El Shatoury ◽  
C. H. Waddington
Keyword(s):  
Salivary Glands ◽  
Intestinal Tract ◽  
Larval Period ◽  
Lethal Mutant ◽  
Lymph Glands ◽  
Periodic Processes ◽  
Drosophila Larvae ◽  
Hind Gut

This paper is concerned with certain aspects of the development of the mid-gut (stomach), hind-gut, and salivary glands of Drosophila larvae. Attention will be particularly concentrated on two types of phenomenon, firstly, on periodic processes of hypertrophy and regression which affect certain of the larval tissues comprising these organs, and, secondly, on the development of groups of imaginal cells which, at metamorphosis, produce the tissues from which the adult organs are built up. There is evidence that in the control of both these processes an important part is played by the lymph glands. This evidence is derived primarily from the study of certain lethal mutant types which will be described in a later communication (Shatoury & Waddington, 1957b). In these lethals it is found that abnormality of the lymph glands is associated with and appears to be the cause of excessive hypertrophy of the larval cells composing the gut.

STUDY OF PERIODIC PROCESSES TAKING INTO ACCOUNT THE UNCERTAINTY STATE FACTOR OF THE ANALYZED PARAMETER

2021 ◽  
Vol 1 (7) ◽  
pp. 5-15
Author(s):  
V.L. Lazarev ◽  
Keyword(s):  
Adaptive Control ◽  
Control System ◽  
Practical Implementation ◽  
Periodic Processes ◽  
Numerical Assessment ◽  
State Factor

The paper describes the approach and methodology for the numerical assessment of the quality of periodic processes. With regard to their particular case the processes of selfoscillations, on the basis of the proposed approach, the problem of optimization of the control system is formulated and possible ways of solving it are shown. The practical implementation of the approach is possible when synthesizing a control system, as well as in the variant of automatic adaptive control during its operation. The proposed solutions are based on the use of methods of the theory of entropy potentials. The implementation of the proposed solutions will improve the quality of monitoring of periodic processes and the efficiency of regulation systems in selfoscillation modes.

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