A physical model for electromagnetic control of local temperature gradients in a Czochralski system

2010 ◽  
Vol 46 (4) ◽  
pp. 353-362 ◽  
Author(s):  
A. Cramer ◽  
M. Röder ◽  
J. Pal ◽  
G. Gerbeth
Keyword(s):  
Physical Model ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Electromagnetic Control

Relation between local temperature gradients and the direction of heat flow in quantum driven systems

2012 ◽  
Vol 407 (16) ◽  
pp. 3172-3174 ◽  
Author(s):  
Alvaro Caso ◽  
Liliana Arrachea ◽  
Gustavo S. Lozano
Keyword(s):  
Heat Flow ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Driven Systems

Pulsated flow regime in fractures: a possible explanation of local temperature gradients in hydrothermal systems

Geothermics ◽  
1990 ◽  
Vol 19 (4) ◽  
pp. 329-339 ◽  
Author(s):  
Pierre-Olivier Grimaud ◽  
Gérard Touchard ◽  
Daniel Beaufort ◽  
Alain Meunier
Keyword(s):  
Flow Regime ◽  
Hydrothermal Systems ◽  
Temperature Gradients ◽  
Local Temperature

scholarly journals The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production

2015 ◽  
Vol 17 (5) ◽  
pp. 2745-2749 ◽  
Author(s):  
P. V. Cherepanov ◽  
I. Melnyk ◽  
E. V. Skorb ◽  
P. Fratzl ◽  
E. Zolotoyabko ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Shock Waves ◽  
Low Cost ◽  
Ultrasonic Cavitation ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Near Surface ◽  
Surface Structuring ◽  
Interparticle Collisions

Ultrasonically induced shock waves stimulate intensive interparticle collisions in suspensions and create large local temperature gradients in AlNi particles.

Research on an external adjustment method for RPECT roll profiles based on the segmented cooling principle

2021 ◽  
Vol 119 (1) ◽  
pp. 103
Author(s):  
Tingsong Yang ◽  
Yingwei Wang ◽  
Haijun Wang ◽  
Yang Hai ◽  
Fengshan Du
Keyword(s):  
Coupled Model ◽  
Temperature Gradients ◽  
Control Technology ◽  
Radial Temperature ◽  
Roll Profile ◽  
Adjustment Method ◽  
External Adjustment ◽  
Flatness Control ◽  
Electromagnetic Control ◽  
Flatness Defect

Roll profile electromagnetic control technology (RPECT) is a new strip flatness control technology that changes roll gap shape by controlling the roll profiles of electromagnetic control rolls (ECRs). To address the randomness of the flatness defect locations, this paper proposes an external adjustment method for RPECT roll profiles based on the segmented cooling principle. Based on the layout of the cooling areas and electromagnetic sticks, an electromagnetic-thermal-structural coupled model is established to analyse roll profile variations. The results show that symmetrically changing the cooling intensities of the different cooling areas can increase or decrease the roll crown of the ECR, while asymmetrically changing the cooling intensities of the different cooling areas can change the position of the maximum bulging point of the ECR. Variations in the component cooling ratio coefficient impact the effects of different cooling strategies, which needs to be considered when selecting the cooling strategy configuration scheme. Compared the maximum bulging values, radial temperature gradients and axial temperature gradients of different electromagnetic stick (ES) structures, the regulation law reverses when the length of the ES is too small, and the variation of the law is very small. Therefore, different ES structures have different segmented cooling regulation characteristics.

EXPERIMENTAL STUDIES OF CAR PROPERTIES ON A PHYSICAL MODEL

2019 ◽  
pp. 10-16
Author(s):  
Oleksii Timkov ◽  
Dmytro Yashchenko ◽  
Volodymyr Bosenko
Keyword(s):  
Mathematical Model ◽  
Remote Control ◽  
Physical Model ◽  
Model Experiment ◽  
Experimental Studies ◽  
Electrical Energy ◽  
Short Term ◽  
Motor Current ◽  
Memory Card ◽  
The Mathematical Model

The article deals with the development of a physical model of a car equipped with measuring, recording and remote control equipment for experimental study of car properties. A detailed description of the design of the physical model and of the electronic modules used is given, links to application libraries and the code of the first part of the program for remote control of the model are given. Atmega microcontroller on the Arduino Uno platform was used to manage the model and register the parameters. When moving the car on the memory card saved such parameters as speed, voltage on the motor, current on the motor, the angle of the steered wheel, acceleration along three coordinate axes are recorded. Use of more powerful microcontrollers will allow to expand the list of the registered parameters of movement of the car. It is possible to measure the forces acting on the elements of the car and other parameters. In the future, it is planned to develop a mathematical model of motion of the car and check its adequacy in conducting experimental studies on maneuverability on the physical model. In addition, it is possible to conduct studies of stability and consumption of electrical energy. The physical model allows to quickly change geometric dimensions and mass parameters. In the study of highway trains, this approach will allow to investigate the various layout schemes of highway trains in the short term. It is possible to make two-axle road trains and saddle towed trains, three-way hitched trains of different layout. The results obtained will allow us to improve not only the mathematical model, but also the experimental physical model, and move on to further study the properties of hybrid road trains with an active trailer link. This approach allows to reduce material and time costs when researching the properties of cars and road trains. Keywords: car, physical model, experiment, road trains, sensor, remote control, maneuverability, stability.

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