scholarly journals Analytical theory of high-speed nonequilibrium in a binary mixture of gases with a predominant light component

2021 ◽  
Vol 2056 (1) ◽  
pp. 012008
Author(s):  
I V Demidov ◽  
M M Kuznetsov ◽  
Y D Kuleshova ◽  
A V Tikhonovets
Keyword(s):  
Binary Mixture ◽  
High Speed ◽  
Analytical Theory ◽  
Light Component ◽  
Analytical Assessment ◽  
Speed Effect

Abstract Analytical estimates are obtained that allow, first of all, to determine the fundamental conditions for the existence of a high-speed effect. In addition, an analytical assessment of the greatest value of this effect is given.

scholarly journals ANALYSIS OF MOTOR SPEED EFFECT ON WINDING TENSION IN THE WIND UP CALENDERING PROCESS

2019 ◽  
Vol 1 (1) ◽  
pp. 5-8
Author(s):  
Sugiyarto Sugiyarto ◽  
Widi Setiawan
Keyword(s):  
High Speed ◽  
Rolling Process ◽  
Manufacturing Industries ◽  
Internal Stresses ◽  
Disc Brake ◽  
Typical Characteristic ◽  
Motor Speed ◽  
Speed Effect ◽  
The Right ◽  
Winding Tension

The winding process is widely used in manufacturing industries. For the high speed winding, the centre winding method is used. Irregular internal stresses at the centre of the roll result in major weaknesses such as buckling, spoking and cinching. Therefore, entanglement with the right tension is very important to get a stable wound package. It should be mentioned that winders usually operate based on the principle of precision winding. A typical characteristic of winders is increasing the surface speed as the diameter increases. This will cause the winding to increase which has the potential to cause damage. To overcome damage due to an increase in roll tension, the rolling motor speed must decrease so that the roll tension remains the same or even decreases. And because the rolling process uses additional media in the form of a liner fabric which is tension controlled with pneumatic disc brake, the pressure brake must also be made taper constructing both.

Sea Surface Oil Slick Light Component Vaporization and Heavy Residue Sinking: Binary Mixture Theory and Experimental Proof of Concept

2015 ◽  
Vol 32 (8) ◽  
pp. 694-702 ◽  
Author(s):  
Christopher Clayton Stevens ◽  
Louis J. Thibodeaux ◽  
Edward B. Overton ◽  
Kalliat T. Valsaraj ◽  
Krishnaswamy Nandakumar ◽  
...  
Keyword(s):  
Binary Mixture ◽  
Mixture Theory ◽  
Sea Surface ◽  
Proof Of Concept ◽  
Experimental Proof ◽  
Light Component ◽  
Oil Slick ◽  
Heavy Residue

scholarly journals Integrated Pedal System for Data Driven Rehabilitation

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8115
Author(s):  
Alessandro Schaer ◽  
Oskar Helander ◽  
Francesco Buffa ◽  
Alexis Müller ◽  
Kevin Schneider ◽  
...  
Keyword(s):  
Visual Feedback ◽  
High Speed ◽  
Assessment Tool ◽  
Angular Position ◽  
Absolute Error ◽  
Video Capture ◽  
Interactive Training ◽  
Analytical Assessment ◽  
The Mean ◽  
Tablet Device

We present a system capable of providing visual feedback for ergometer training, allowing detailed analysis and gamification. The presented solution can easily upgrade any existing ergometer device. The system consists of a set of pedals with embedded sensors, readout electronics and wireless communication modules and a tablet device for interaction with the users, which can be mounted on any ergometer, transforming it into a full analytical assessment tool with interactive training capabilities. The methods to capture the forces and moments applied to the pedal, as well as the pedal’s angular position, were validated using reference sensors and high-speed video capture systems. The mean-absolute error (MAE) for load is found to be 18.82 N, 25.35 N, 0.153 Nm for Fx, Fz and Mx respectively and the MAE for the pedal angle is 13.2°. A fully gamified experience of ergometer training has been demonstrated with the presented system to enhance the rehabilitation experience with audio visual feedback, based on measured cycling parameters.

Speed effect on the material behavior in high-speed scratching of BK7 glass

2021 ◽  
Author(s):  
Junyuan Feng ◽  
Xiaofang Huang ◽  
Shu Yang ◽  
Jianbo Qing ◽  
Peng Tang ◽  
...  
Keyword(s):  
High Speed ◽  
Material Behavior ◽  
Bk7 Glass ◽  
Speed Effect

scholarly journals Effect of liquid elasticity on the behaviour of high-speed focused jets

2021 ◽  
Vol 62 (2) ◽  
Author(s):  
A. Franco-Gómez ◽  
H. Onuki ◽  
Y. Yokoyama ◽  
Y. Nagatsu ◽  
Y. Tagawa
Keyword(s):  
Inkjet Printing ◽  
High Speed ◽  
Xanthan Gum ◽  
High Viscosity ◽  
Newtonian Liquid ◽  
Elastic Solution ◽  
Rheological Parameters ◽  
Liquid Jets ◽  
Sodium Polyacrylate ◽  
Speed Effect

AbstractWe investigate the effect of highly contrasting non-Newtonian liquid properties on the formation of liquid jets with a focused shape. By using two nozzle-free ejection techniques, mechanically impact- and laser-induced, fast jets of a highly elastic (sodium polyacrylate) and weakly elastic (xanthan-gum) diluted polymer solutions are generated. A unique high-speed effect is encountered at the jet ejection onset of the highly elastic solution. Its jet-tip speed is on average 1.4 times faster in comparison to a Newtonian (glycerin/water) and the weakly elastic liquids. We explain this effect occurring as a result of the high viscoelasticity of the sodium polyacrylate solution. Additionally, a ‘bungee jumper’ jet behaviour (Morrison and Harlen in Rheol Acta 49(6):619–632, 2010) is observed in a regime of high speed ($$10<V_j<40$$ 10 < V j < 40 m/s) and high viscosity ($$\mu >20$$ μ > 20 mPa s) not previously examined. We additionally characterise the viscoelastic non-breakup jet limit using the Bazilevskii et al. (Fluid Dyn 40(3):376–392, 2005) ejection criterion. Herein, the extensional rheological parameters are measured implementing a novel DoS-CaBER technique (Dinic et al. in Lab Chip 17(3):460–473, 2017). Our findings may influence results of inkjet printing technologies and recent nozzle-free ejection systems for ejecting liquids with non-Newtonian properties. Graphical abstract

scholarly journals Measuring Physical Load in Soccer: Strengths and Limitations of 3 Different Methods

2019 ◽  
Vol 14 (5) ◽  
pp. 627-634
Author(s):  
Karin Fischer-Sonderegger ◽  
Wolfgang Taube ◽  
Martin Rumo ◽  
Markus Tschopp
Keyword(s):  
Measurement System ◽  
Performance Indicators ◽  
High Speed ◽  
Absolute Threshold ◽  
Physical Load ◽  
Effect Sizes ◽  
Position Measurement ◽  
Running Speed ◽  
Discriminative Ability ◽  
Speed Effect

Purpose: To investigate the strengths and limitations of different indicators to measure physical load. Furthermore, indicators were evaluated for discrimination between performance levels and playing positions. Methods: Ninety positional match files from 70 elite players and 91 match files from 69 subelite players were collected during 14 official under-18 matches using a local position measurement system. Indicators are calculated from speed, absolute acceleration (acc-abs), or percentage acceleration (acc-%). The acc-% describes the level of acceleration depending on the maximal voluntary acceleration (amax) for each initial running speed. Effect sizes (ES) were used to determine discriminative ability. Results: The number of high accelerations largely depended on the method (absolute threshold [>3 m·s−2 and >4 m·s−2] 120 and 59 efforts; high percentage threshold [>75% amax] 84 efforts). Only a small number of highly accelerated efforts reached speeds considered high-speed running (>19.8 km·h−1: 32.6%). More high acc-% exists from initial running speed >2 m·s−1 (23.0) compared with acc-abs (>3 m·s−2 14.4, >4 m·s−2 5.9). Elite players achieve higher values in most performance indicators, with ES being highest for the number of high acc-% (ES = 0.91) and high acc-abs (>3 m·s−2 ES = 0.86, >4 m·s−2 ES = 0.87), as well as for covered distance in jogging (ES = 0.94). Conclusions: Estimated physical load, discriminative ability of physical indicators, and positional requirements largely depend on the applied method. A combination of speed-based and acc-% methods is recommended to get a comprehensive view.

Research on Surface Quality for CBN Grinding Wheel Based on “Speed Effect”

2015 ◽  
Vol 667 ◽  
pp. 130-135
Author(s):  
Xue Sun ◽  
Tian Biao Yu ◽  
Wan Shan Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
High Speed ◽  
Grinding Wheel ◽  
Grinding Speed ◽  
High Speed Grinding ◽  
Metal Materials ◽  
Speed Effect ◽  
Cbn Grinding Wheel

In order to study the influence of grinding surface quality affected by grinding speed for CBN grinding wheel, the method of simulation and experimentation used to study grinding surface quality of CBN grinding wheel. First, on the basis of grinding wheel topography, the influence of grinding surface quality affected by grinding speed was analyzed by adopting motion simulation method. Then, high-speed grinding experiment was carried out to three kinds of metal materials, and machined surface roughness and surface hardness after processing are measured and researched. Test shows that “speed effect” is remarkable in grinding metal materials. As the grinding speed increases, the grinding surface quality of workpiece is gradually improved. With the speed increasing, surface roughness of workpiecedecreases, and at lower speeds the surface roughness dropped more obvious. With grinding speed increases further, the change of roughness tends to be slow, and the bending point appears at about 100m/s.Surface hardening degree decreases with grinding speed increasing, when grinding speed up to high-speed grinding stage, the degree of hardening of the workpiece is more soothing.

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