scholarly journals PSYCHOMOTOR AND COGNITIVE SKILLS THAT MAKE A DIFFERENCE IN TENNIS PLAYERS AT NATIONAL LEVEL

2020 ◽  
pp. 390-404
Keyword(s):  
Reaction Time ◽  
Cognitive Skills ◽  
National Level ◽  
Cognitive Model ◽  
Tennis Players ◽  
Sports Clubs ◽  
The Road ◽  
The Difference ◽  
On The Road ◽  
Materials Used

Tennis has become an extremely complex sport, with tennis players needing a team of specialists to maximise their sports performance. Performance tennis has proven that the difference between the players, in the conditions of similar technical-tactical performances, is made by the physical and mental training. Our paper aimed to investigate the subjective reality of junior tennis players in order to optimise their actions and activities by identifying a psychomotor and cognitive model of athletes ranked in the top area nationally. The research involved 75 tennis players - 40 boys and 35 girls aged between 14 and 16 years. The materials used were represented by the PSISELTEVA psychological testing system developed by the RQ Plus Company and calibrated to the Romanian population, which contains: levers, desk with buttons, pedals. The tests belonging to the computerised battery used in the research are: TRS (simple reaction time), TRD (discrimination reaction time), RCMV (intersegmental coordination), TUD (eye-hand coordination), ANALOGIE (analogical transfer), TAC (attention concentration), MT (topographical memory) and RNE (resistance to mental fatigue). Through the Mann-Whitney (U) test, significant differences were identified between the first tennis players in the national ranking and the players placed in the middle or final zone of the ranking, in terms of different psychomotor and cognitive coordinates (investigated in various environmental conditions). The results obtained are useful both for specialists working in the field of tennis (coaches, sports psychologists, physical trainers), athletes (boys and girls) aspiring on the road to great performance, but also for sports clubs.

Determination of Resistance to Abrasive Wear. VIII. Influence of Softeners in Tests with the Akron-Croydon and Du Pont Machines

1949 ◽  
Vol 22 (1) ◽  
pp. 259-262
Author(s):  
J. F. Morley
Keyword(s):  
Unit Area ◽  
Published Data ◽  
The Road ◽  
Abrasive Surface ◽  
Abrasive Power ◽  
The Difference ◽  
On The Road ◽  
The Right ◽  
Abrasion Testing

Abstract These experiments indicate that softeners can influence abrasion resistance, as measured by laboratory machines, in some manner other than by altering the stress-strain properties of the rubber. One possible explanation is that the softener acts as a lubricant to the abrasive surface. Since this surface, in laboratory abrasion-testing machines, is relatively small, and comes repeatedly into contact with the rubber under test, it seems possible that it may become coated with a thin layer of softener that reduces its abrasive power. It would be interesting in this connection to try an abrasive machine in which a long continuous strip of abrasive material was used, no part of it being used more than once, so as to eliminate or minimize this lubricating effect. The fact that the effect of the softener is more pronounced on the du Pont than on the Akron-Croydon machine lends support to the lubrication hypothesis, because on the former machine the rate of wear per unit area of abrasive is much greater. Thus in the present tests the volume of rubber abraded per hr. per sq. cm. of abrasive surface ranges from 0.03 to 0.11 cc. on the du Pont machine and from 0.0035 to 0.0045 cc. on the Akron-Croydon machine. On the other hand, if the softener acts as a lubricant, it would be expected to reduce considerably the friction between the abrasive and the rubber and hence the energy used in dragging the rubber over the abrasive surface. The energy figures given in the right-hand columns of Tables 1 and 3, however, show that there is relatively little variation between the different rubbers. As a test of the lubrication hypothesis, it would be of interest to vary the conditions of test so that approximately the same amount of rubber per unit area of abrasive is abraded in a given time on both machines; this should show whether the phenomena observed under the present test conditions are due solely to the difference in rate of wear or to an inherent difference in the type of wear on the two machines. This could most conveniently be done by considerably reducing the load on the du Pont machine. In the original work on this machine the load was standardized at 8 pounds, but no figures are quoted to show how abrasion loss varies with the load. As an addition to the present investigation, it is proposed to examine the effect of this variation with special reference to rubbers containing various amounts and types of softener. Published data on the influence of softeners on the road wear of tire rubbers do not indicate anything like such large effects as are shown by the du Pont machine. This throws some doubt on the value of this machine for testing tire tread rubbers, a conclusion which is confirmed by information obtained from other workers.

Drivers' Brake Reaction Times

1971 ◽  
Vol 13 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Gunnar Johansson ◽  
Kåre Rumar
Keyword(s):  
Reaction Time ◽  
Small Group ◽  
Correction Factor ◽  
Reaction Times ◽  
Large Group ◽  
The Road ◽  
On The Road

The object of this investigation was to determine the distribution of brake reaction times which can be expected from drivers who have to brake suddenly and completely unexpectedly in traffic situations. The experiments were carried out as follows: 1. Brake reaction time was measured on a large group of drivers (321), in an anticipated situation on the road (Brake reaction time 1). 2. A small group of drivers (5) was repeatedly tested in the same way (Brake reaction time 2). 3. The same small group was repeatedly tested in a surprise situation (Brake reaction time 3). 4. The ratio of brake reaction time 3 to brake reaction time 2 was used as a correction factor and applied to brake reaction time 1. The corrected median of the resulting distribution was 0.9 sec.; 25% of the group was estimated to have a brake reaction time longer than 1.2 sec.

scholarly journals Intellectual Property in Clinical Research - the Obstacles on the Road

2021 ◽  
Vol 7 (1) ◽  
pp. 156-172
Author(s):  
Iulianna Lupasco ◽  
Keyword(s):  
Intellectual Property ◽  
Clinical Research ◽  
National Level ◽  
Scientific Field ◽  
Special Issue ◽  
Short Introduction ◽  
The Road ◽  
Scientific Innovation ◽  
The World ◽  
On The Road

Intellectual property behind the scenery of clinical research present a very special issue in scientific field presenting a deep underestimation of the main precious production of scientific researchers – production of mind, intellect, knowledge, clinical practice and research. In this article are highlighted main questions the young researches and not only young ones face while generating ideas, developing into nice projects. In this topic are discussed the main types of intellectual property in clinical research with a short introduction how the law protects them on a national level and why intellectual property is important for every clinical scientist. The literature review is closely intertwined with our own observations over the years in terms of intellectual property. Finally, the main benefits of intellectual property protection for clinical researchers will be presented empowering with new contacts and scientific innovation leaders from other places of the world.

Vehicle Association and Tracking in Image Sequences Using Feature-Based Similarity Comparison

2014 ◽  
Vol 536-537 ◽  
pp. 176-179 ◽  
Author(s):  
Du Hyung Cho ◽  
M. Naushad Ali ◽  
Seok Ju Chun ◽  
Seok Lyong Lee
Keyword(s):  
Image Sequences ◽  
Similarity Comparison ◽  
Current Frame ◽  
The Road ◽  
Multiple Vehicles ◽  
Feature Based ◽  
The Difference ◽  
On The Road ◽  
Difference Operation ◽  
Object Association

Object association and tracking have attracted great attention in the computer vision. In this paper, we present an object association and tracking method for monitoring multiple vehicles on the road based on objects' visual features and the similarity comparison between them. First, we identify vehicles using the difference operation between the current frame in CCTV image sequences and the referential images that are stored in a database, and then extract various features from the vehicles identified. Finally, we associate the objects in the current frame with those in the next frames using similarity comparison, and track multiple objects over a sequence of CCTV image frames. Empirical study using CCTV images shows that our method has achieved the considerable effectiveness in tracking vehicles on the road.

scholarly journals Competence-based multiple learning paths: on the road of implementation

2014 ◽  
Vol 2 (1) ◽  
pp. 107
Author(s):  
María Dolores De Prada ◽  
Julia González
Keyword(s):  
Secondary Teachers ◽  
Research Implementation ◽  
Math Teachers ◽  
The Road ◽  
Competence Evaluation ◽  
Second Year ◽  
Learning Paths ◽  
On The Road ◽  
Materials Used ◽  
Initial Results

<p>This article presents the results of an action-research implementation project based on a system that weaves together five different routes to facilitate the development of competences through the use of multiple learning paths for primary and secondary teachers. The first and initial results that the article deals with relate to the experience of math teachers for ages 11 to 14. Other levels and other fields are in the process of being developed. The article deals briefly with the justification, the background and the fundamental principles that underpin the research methodology and introduces a number of elements such as the method followed by the research, the resources and the materials used as well as the results obtained at the end of the second year of this experience. It also justifies the model chosen and the criteria and strategies selected for its reliability and verification. In addition, it provides significant elements of reflection about a number of burning issues: The development of a new profile of the “teacher” in a studentcentred system and the implementation system to be followed, the importance of multiple but integrated learning paths and the relevance as well as the reflection on real cases of competence evaluation.</p>

scholarly journals In Situ Measurement of Discomfort Curves for Seated Subjects in a Car on the Four-Post Rig

2014 ◽  
Vol 2014 ◽  
pp. 1-14
Author(s):  
T. Ibicek ◽  
A. N. Thite
Keyword(s):  
Predictive Models ◽  
Dynamic Behaviour ◽  
Rate Of Change ◽  
Test Results ◽  
Vehicle Dynamic ◽  
The Road ◽  
Perceived Intensity ◽  
The Difference ◽  
On The Road

The aim of this study is to measure and quantify perceived intensity of discomfort due to vibration in a vehicle in situ considering complete vehicle dynamic behaviour. The shaker table based discomfort curves or the road test results may not accurately and universally indicate the true level of human discomfort in a vehicle. A new experimental method, using a seated human in a car on the four-post rig simulator, is proposed to quantify discomfort. The intensity of perception to vibration decreased with decreasing input and increasing frequency; the rate of change is different from the published literature; the difference is large for angular modes of inputs. Vehicle dynamic response is used to inform and analyse the results. The repeatability of the method and the fact that they are in situ measurements may eventually help reduce reliance on the road tests. Furthermore, discomfort curves obtained, subsequently, can be used in predictive models.

Analysis of reaction time and lateral displacements in national level table tennis players: are they predictive of sport performance?

2019 ◽  
Vol 19 (4) ◽  
pp. 467-477 ◽  
Author(s):  
Carlos Castellar ◽  
Francisco Pradas ◽  
Luis Carrasco ◽  
Ana De La Torre ◽  
José Antonio González-Jurado
Keyword(s):  
Reaction Time ◽  
National Level ◽  
Sport Performance ◽  
Table Tennis ◽  
Tennis Players ◽  
Lateral Displacements

Mechanical performance in field conditions of treated and stabilized granular materials used in unpaved roads: a longitudinal study

2014 ◽  
Vol 41 (2) ◽  
pp. 97-105
Author(s):  
L. Beaulieu ◽  
R. Pleau ◽  
P. Pierre ◽  
P. Poulin ◽  
S. Juneau
Keyword(s):  
Granular Material ◽  
Mechanical Performance ◽  
Field Tests ◽  
Field Conditions ◽  
The Road ◽  
On The Road ◽  
Materials Used ◽  
Falling Weight ◽  
Road Following ◽  
The Impact

The main objective of this article is to propose a methodology to evaluate and to study the mechanical performance of various hygroscopic, organic and synthetic dust suppressants and stabilization agents through field tests. Different road sections were treated for several years and many tests have been conducted. The impact on the mechanical performance of the treated granular material has been studied under field conditions by evaluating the deterioration of the road following the spreading of the product on the road. Field tests were conducted over three years in summers 2007, 2008, and 2009. The deterioration of the road is evaluated in terms of improper cross section, inadequate roadside drainage, corrugations, dust, potholes, ruts, and loose aggregates. To evaluate the influence of stabilization agents on the bearing capacity of the granular material on the road, falling weight deflectometer (FWD) tests have also been performed.

Safety Aspects of Sophisticated In-Vehicle Information Displays and Controls

1986 ◽  
Vol 30 (3) ◽  
pp. 256-260 ◽  
Author(s):  
Helmut T. Zwahlen ◽  
David P. DeBald
Keyword(s):  
Standard Deviation ◽  
Occlusion Time ◽  
The Road ◽  
Safety Aspects ◽  
Eyes Closed ◽  
Starting Point ◽  
Reading Text ◽  
Standard Deviations ◽  
The Difference ◽  
On The Road

Two groups of six young and healthy subjects were used in this study to investigate the lateral path deviations when driving in a straight path with the eyes fixated on the road ahead, when driving while reading information inside of the automobile, and when driving with the eyes closed. Each group of subjects drove a typical large car and a typical small car at a fixed speed of 30 mph. An unused 2000 foot long and 75 foot wide, level, concrete airport runway was used to conduct the experiment. Each subject made three runs under each of the three conditions with the large car and with the small car (18 runs total). The lateral path deviations from the longitudinal centerline of the car to the centerline of the runway were measured every 15 feet for a distance of 705 feet. A device which dripped liquid dye was attached to the center of the rear bumper of the automobiles to indicate their paths. The results of this study show that the average lateral standard deviations for driving with the eyes fixated upon the road ahead were between 5.5″ and 11.3″. The difference in the lateral standard deviations for large and small automobiles was statistically not significant for distances between 100 and 500 feet from the starting point for the three conditions tested. The lateral standard deviation was smaller for reading text within the automobile than for driving with the eyes closed, and was statistically significant after an occlusion distance of 225 feet or an occlusion time of about 5 seconds. Using a constant of 0.041, the fundamental relationship between the lateral standard deviation, the speed, and the occlusion distance developed by Zwahlen and Balasubramanian (1974) fits the data for reading text inside of the automobile while driving fairly well. This constant is approximately one half of that which has been used for driving with the eyes closed (0.076) in this study. Based upon the results of this study, the development and introduction of sophisticated in-vehicle displays and/or touch panels should be halted and their safety aspects with regard to information aquisition, information processing, and driver control actions should be critically evaluated.

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