Evaluation of experimental testing methods for the design of permeable friction course mixtures

Abstract This paper presents typical methods for conducting experimental tests on main shaft slide bearings. There are described their possible testing capabilities, advantages, drawbacks and limitations. Various testing methods were analyzed to find a solution able of providing a wide range of possible investigations at possibly acceptable limitations.

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IMPROVEMENT OF THEORETICAL COMPETENCE OF BEGINNER ATHLETES IN CYCLIC SPORTS

Sport Science and Human Health ◽

10.28925/2664-2069.2020.1.1 ◽

2020 ◽

Author(s):

Viktoriia Bohuslavska ◽

Іvan Hlukhov ◽

Maryn Pityn

Keyword(s):

Theoretical Analysis ◽

Experimental Testing ◽

Training System ◽

General Level ◽

Initial Training ◽

Testing Methods ◽

Interactive Tools ◽

Literary Sources ◽

Legislative Framework ◽

Effectiveness Of Training

Introduction. Despite the constant modernization of the athletes’ training system, as well as the existing legislative framework aimed at innovative transformations in the field of physical education and sports, currently, there is no information on the use of interactive tools in the theoretical training of athletes in cyclic sports, and it does not meet modern requirements for training athletes. The study aimed to compare the effectiveness of training with the use of traditional and author’s interactive tools of theoretical training of beginner athletes in cyclic sports. Material and methods. In this work, the following research methods were used: theoretical analysis and generalization of literary sources, pedagogical observation, pedagogical experiment, pedagogical testing, methods of mathematical statistics. The study included 36 people involved in kayaking and canoeing at the stage of initial training. The sports experience of the subjects was 1-2 years, qualification at the level of III sports categories. Classes on the developed programs were conducted in the preparatory period of the macrocycle. Results. Training, in which only the theoretical training tools recommended by the curriculum were used, proved to be ineffective in most sections of knowledge at the stage of initial training of athletes. Training sessions with the use of interactive tools proved to be more effective than classes that used only the theoretical training tools recommended by the curriculum. Conclusions. Classes with the use of interactive theoretical training tools contributed more to the increase of the general level of theoretical training of young rowers at the stage of initial training - up to 57,4 % (p < 0.05) than classes using only theoretical training tools recommended by the curriculum. - up to 40,8 % (p < 0.05). Prospects for further research in this direction include the development and experimental testing of the author’s interactive tools for theoretical training, which will increase the level of theoretical training of athletes at different stages of training in cyclical sports.

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Comparative study of experimental testing methods for characterization parameters of coal spontaneous combustion

Fuel ◽

10.1016/j.fuel.2020.117880 ◽

2020 ◽

Vol 275 ◽

pp. 117880 ◽

Cited By ~ 2

Author(s):

Hu Wen ◽

Hu Wang ◽

Wenyong Liu ◽

Xiaojiao Cheng

Keyword(s):

Comparative Study ◽

Spontaneous Combustion ◽

Experimental Testing ◽

Testing Methods ◽

Coal Spontaneous Combustion

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A new slip surface in noncohesive slopes

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1212/1/012033 ◽

2022 ◽

Vol 1212 (1) ◽

pp. 012033

Author(s):

J A Repadi ◽

F Bari ◽

F A Ismail ◽

A Andriani ◽

A Hakam

Keyword(s):

Experimental Method ◽

Slip Surface ◽

Experimental Testing ◽

Testing Methods ◽

Sand Material ◽

Slope Safety

Abstract Determining the slope slip surface is difficult, prominent and uncertain. Slip-surface are utilized to estimate slope safety. This study aimed at investigating the slip surface caused by statistical loads by using experimental testing methods. The experimental method was conducted by providing a statistical load on the sand slope The load was used until the slope collapsed. Sand slopes were modeled in a glass box measuring 110 cm x 40 cm x 10 cm. The sand material used was sand that passed through sieve no.10 and was held by sieve no. 200. At a distance of 2.5 cm horizontally and at a distance of 5 cm vertically, colored marks were used to see the pattern of grain movement. Observations were conducted until the slope collapsed. The collapse pattern revealed in the experimental method is non-circular.

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Drying Stress and Strain of Wood: A Review

Applied Sciences ◽

10.3390/app11115023 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5023

Author(s):

Qin Yin ◽

Hong-Hai Liu

Keyword(s):

Near Infrared ◽

Experimental Testing ◽

Stress And Strain ◽

Strain Development ◽

Testing Methods ◽

Wood Drying ◽

Stress Changes ◽

Reasonable Prediction ◽

Analysis System ◽

Cell Wall Mechanics

Wood drying stress causes various drying defects, which result from the wood microstructure and the transfer of heat and mass during the drying. It is the fundamental way to solve the problem of defects to clarify the law and mechanism of wood stress and strain development during drying. In this paper, based on the defects of wood drying, the theory and experimental testing methods of drying stress and strain were summarized. Meanwhile, artificial neural networks (ANN) and their application in the wood drying field were also investigated. The traditional prong and slicing methods were used practically in the research and industry of wood drying, but the stress changes in-process cannot be trapped. The technologies of image analysis and near-infrared spectroscopy provide a new opportunity for the detection of drying stress and strain. Hence, future interest should be attached to the combination of the theory of heat and mass transfer and their coupling during drying with the theory of microscopic cell wall mechanics and macroscopic drying. A more complete image acquisition and analysis system should be developed to realize the real-time monitoring of drying strain and cracking, practically. A more feasible and reasonable prediction model of wood drying stress and strain should be established to achieve the accuracy of the prediction.

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Comparative analysis of the chosen properties of filtrating type protective masks

Hemijska industrija ◽

10.2298/hemind130612070r ◽

2014 ◽

Vol 68 (4) ◽

pp. 457-464 ◽

Cited By ~ 1

Author(s):

Dusan Rajic ◽

Zeljko Kamberovic ◽

Radovan Karkalic ◽

Maja Vitorovic-Todorovic ◽

Negovan Ivankovic ◽

...

Keyword(s):

Optical Properties ◽

Comparative Analysis ◽

Standardized Testing ◽

Experimental Testing ◽

Field Of View ◽

Quality Level ◽

Dynamic Resistance ◽

Testing Methods ◽

Protection Factor ◽

Previous Generation

The results of comparative experimental testing of different filtrating type masks are presented in this study. Some of the most important functional properties have been tested on available models of Italian, French, British, Canadian, Swiss, American, and three models of Serbian military protective masks (M3 of the latest generation, as well as M2, and M2FV models of the previous generation). Using of the standardized testing methods, mask models have been tested on protection factor, dynamic resistance of the exhaust valve and its static permeability, the overall inhalation resistance of protective masks, field of view and optical properties. Based on experimental results obtained, it can be concluded that the Serbian mask M3 is on approximately same quality level as tested foreign masks, and above Serbian protective masks of the previous generation marked M2F and M2FV.

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The structural integrity of flash-butt welded premium rail steel – Evaluation of strength, microstructure and defects

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/0954409720973138 ◽

2020 ◽

pp. 095440972097313

Author(s):

Anthony Micheletto ◽

John Cookson ◽

Yong Pang ◽

Bernard Chen ◽

Peter Mutton

Keyword(s):

Structural Integrity ◽

Rail Steel ◽

Experimental Testing ◽

Non Destructive Testing ◽

Testing Methods ◽

Destructive Testing ◽

Integrity Assessment ◽

Catastrophic Failures ◽

Non Destructive ◽

Microstructural Examination

Experimental testing of flash-butt welded premium rail steel samples was undertaken to quantify the variation in strength through the cross-section of the weld, with results showing a general correlation between the width of the heat-affected-zone and the ultimate tensile strength. Microstructural examination and fractography revealed the presence of defects in some samples. Large defects can be identified by non-destructive testing methods as part of routine structural integrity assessment; however, small defects may escape detection but could propagate under cyclic loading in service leading to catastrophic failures. This work demonstrates the requirement for stringent control of heat input to prevent the development of defects in premium rail steels with high alloying content.

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Comparison of Fire Resistance Testing Methods for Structures with Timber Elements

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.109.73 ◽

2021 ◽

Vol 109 ◽

pp. 73-85

Author(s):

Tomáš Žajdlík ◽

Karel Šuhajda

Keyword(s):

Fire Resistance ◽

Experimental Testing ◽

Building Construction ◽

The Other ◽

Resistance Testing ◽

Testing Methods ◽

The Czech Republic ◽

Timber Construction ◽

Main Disadvantage ◽

Natural Wood

Wood is a natural anisotropic material that is used in building construction because of the advantageous properties of wood. Speed of construction and the final price of the building represent the main advantages of timber houses. On the other hand, the main disadvantage of these buildings can be the low fire resistance due to the flammable properties of natural wood. There are many limitations for designing these kinds of buildings in the Czech Republic. The limitations are presented in the standards and laws of the CR. This article focuses on the comparison of the methods for testing structures using timber construction elements. The paper presents and compares experimental testing results of a timber structure’s fire resistance in a combustion chamber.

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