Development of Methodological Support for the Study of Materials’ Air Permeability

2019 ◽  
Vol 945 ◽  
pp. 938-943
Author(s):  
I.A. Sheromova ◽  
A.S. Zheleznyakov
Keyword(s):  
Air Permeability ◽  
Control Procedure ◽  
Fibrous Materials ◽  
Additional Advantage ◽  
Textile Materials ◽  
The Subject ◽  
Properties Of Materials ◽  
Materials Used ◽  
Different Levels

The object of research of the article is the methodological and technical support for the process of studying the characteristics of ergonomic properties of materials used in the manufacture of garments, and the subject – the method for the determination of textile materials’ air permeability. The aim of the work is to simplify the method for determination of fibrous materials’ air permeability and to expand the technological capabilities of its instrument base while increasing the flexibility of the control procedure. To achieve this goal, the tasks related to the analysis of existing methods and technical means, and the development of a new method for determining the air permeability of textile materials were solved. The principal difference in the developed method is the possibility to conduct studies on the air permeability of textile materials at different levels of pressure drop on both sides of the sample, and not only in accordance with the standardized requirements. An additional advantage of the method is the possibility to create an online electronic database on the properties of materials. In comparison with analogues, the proposed method for the determination of air permeability ensures the accuracy and reliability of the data obtained, as well as facilitates the testing process by automation.

Express-Method for Determination the Fibrous Materials Resistance to Bending

2019 ◽  
Vol 945 ◽  
pp. 407-411 ◽  
Author(s):  
I.A. Sheromova ◽  
G.P. Starkova ◽  
A.S. Zheleznyakov
Keyword(s):  
Universal Method ◽  
Fibrous Materials ◽  
Electronic Database ◽  
Natural Oscillations ◽  
The Subject ◽  
Properties Of Materials ◽  
Methodological Approaches ◽  
Materials Used ◽  
Express Methods

The object of research of the article is the characteristics of mechanical properties of fibrous systems under the bending deformation, and the subject is the method of determination of the resistance to bending. The aim of the work is to develop a new universal method for evaluating the resistance of fibrous materials to bending, including, among other things, the possibility of forming an electronic database on the characteristic properties of materials. To achieve this goal, a set of problems related to the analysis of existing methodological approaches and technical means, the rationale for possible solutions to the problem posed, and the development of a new patentable method for evaluating the materials’ resistance to bending, have been solved in the research. In the course of the project, a study was developed of the required characteristics for textile and leather-fur materials used for the manufacture of garments. The method is based on the use of natural oscillations frequencies of the material as an informative parameter of their resistance to bending. The method belongs to the class of express methods and provides an opportunity to create an electronic database on the properties of materials online. The approbation of the proposed solution by comparing the estimates obtained with the results of studies obtained on the basis of a standardized method (the method of the console), showed sufficient accuracy and the possibility of practical application of the developed method.

The Simulation of Heat and Vapour Transfer Trough Fibrous Materials

2010 ◽  
Vol 297-301 ◽  
pp. 1205-1209 ◽  
Author(s):  
Ivana Salopek Čubrić ◽  
Zenun Skenderi
Keyword(s):  
Structural Parameters ◽  
Basic Structure ◽  
Raw Material ◽  
Fibrous Materials ◽  
Vapour Permeability ◽  
Physiological Processes ◽  
Repeat Units ◽  
Materials Used

The heat and water vapour transmitting properties of fibrous materials are important factors that affect the clothing's comfort as well as the quality of special functional clothing that is worn in extreme environmental conditions. The paper introduces advanced system for the simulation of physiological processes that appear next to the human skin. Its use enables the measurement of heat and vapour transfer trough fibrous structures, as well as determination of vapour permeability and permeability index. The experiments reported here refer to the measurement of a number of fibrous materials used for the next-to-skin wear. For the measurement have been produced materials that differ either in their structure or raw material in order to observe the influences of different parameters to the transfer properties. The transfer trough fibrous materials is mainly affected by its structure that comprises of a repeat units with cellular geometry containing air pores, yarns that form basic structure and intersection points of two or more yarns. Therefore, the structure of materials is also investigated and described by means of fabric moduli. Dynamics of heat and vapour transfer is observed through the experimentally obtained data and the influence of a number of structural parameters is discussed. The statistical methods are used to qualify the effects of investigated variables on the heat and vapour resistance.

Determination of Teacher Candidates’ Opinions About The Efficiency of Virtual Classes Used in Distance Education

2016 ◽  
Vol 6 (2) ◽  
pp. 143
Author(s):  
Hafize Keser ◽  
Huseyin Bicen ◽  
Semih Caliskan
Keyword(s):  
Distance Education ◽  
Teacher Candidates ◽  
Virtual Classroom ◽  
Spring Semester ◽  
Virtual Class ◽  
Virtual Classes ◽  
The Subject ◽  
Materials Used ◽  
Academic Year

This study was aimed to determine the teacher candidates’ opinions about the efficiency of virtual classes. 173 voluntary teacher candidates who receive distance education at Near East University participated in this research. This research was conducted in the spring semester of 2014-2015 academic year. The results of 5-point Likert-type Scale which was developed by the researchers were analyzed with SPSS program. When the results of the research were analyzed, it was revealed that teacher candidates who receive distance education reported that, virtual classes are effective in learning, being in the virtual classes at the same time with their teachers increase the students’ interests in the lecture, the materials used in the lectures are more effective for students to understand the subject, the students get opinions from their classmates by making their presentations through file sharing in virtual class setting and this leads to a significant contribution to their learning. Keywords: distance learning, virtual classroom, bigbluebutton 

Determination of teacher candidates’ opinions about the efficiency of virtual classes used in distance education

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
Hafize Keser ◽  
Huseyin Bicen ◽  
Semih Caliskan
Keyword(s):  
Distance Education ◽  
Teacher Candidates ◽  
Virtual Classroom ◽  
Spring Semester ◽  
Virtual Class ◽  
Virtual Classes ◽  
The Subject ◽  
Materials Used ◽  
Academic Year

This study was aimed to determine the teacher candidates’ opinions about the efficiency of virtual classes. 173 voluntary teacher candidates who receive distance education at Near East University participated in this research. This research was conducted in the spring semester of 2014-2015 academic year. The results of 5-point Likert-type Scale which was developed by the researchers were analyzed with SPSS program. When the results of the research were analyzed, it was revealed that teacher candidates who receive distance education reported that, virtual classes are effective in learning, being in the virtual classes at the same time with their teachers increase the students’ interests in the lecture, the materials used in the lectures are more effective for students to understand the subject, the students get opinions from their classmates by making their presentations through file sharing in virtual class setting and this leads to a significant contribution to their learning.Keywords: distance learning, virtual classroom, bigbluebutton

Measurement System for Determination of Supercapacitor Equivalent Parameters

2013 ◽  
Vol 20 (4) ◽  
pp. 581-590 ◽  
Author(s):  
Ryszard Kopka ◽  
Wiesław Tarczyński
Keyword(s):  
Measurement System ◽  
Properties Of Materials ◽  
Materials Used ◽  
Measurement Capabilities

Abstract In this paper a measurement system for determination of supercapacitor equivalent parameters is proposed. Specific properties of materials used for supercapacitor construction require some advanced tools and measurement procedures to be applied during tests. The measurement system allows to measure values of equivalent parameters by both the DC and AC method whilst keeping appropriate time criteria required by this type of devices. Furthermore, in this paper the most relevant properties and measurement capabilities of the proposed system are described as well as some exemplary values of the supercapacitor equivalent parameters measured experimentally are presented.

scholarly journals Porosity of Knitted Fabrics in the Aspect of Air Permeability - Discussion of Selected Assumptions

2017 ◽  
Vol 25 (0) ◽  
pp. 86-91 ◽  
Author(s):  
Marie Havlová ◽  
Jana Špánková
Keyword(s):  
Theoretical Calculations ◽  
Correlation Coefficients ◽  
Air Permeability ◽  
Knitted Fabrics ◽  
Textile Materials ◽  
Yarn Hairiness ◽  
The Relationship ◽  
Very High ◽  
Single Jersey

The main focus of this paper is to look into the relationship between the structure and air permeability of single jersey knitted fabric – especially verifying some basic assumptions. First, if it is possible to neglect the permeability of yarns themselves when we evaluate that of knits, and second, if yarn hairiness plays a significant role when we evaluate the relationship between air permeability and the porosity of knits. Theoretical calculations and experiments which were performed using an analysis of microscopic images of the structure of textile materials are used for the determination of inter-yarn and intra-yarn porosity. The paper aims to show t hat the characteristic dimension of inter-yarn pores is significantly higher than that of intra-yarn pores, and also that the values of inter-yarn porosity measured using image analysis methods with hairiness and after the removal of hairiness are statistically significantly different. The correlation coefficients for the porosity values measured and calculated are very high.

scholarly journals Assessment of “maturity” of the taxpayer's internal control system for tax monitoring purposes

2021 ◽  
pp. 28-59
Author(s):  
Elena Vladimirovna Berezina ◽  
Anna Sergeevna Balandina ◽  
Ol'ga Svyatoslavovna Belomyttseva
Keyword(s):  
Control System ◽  
Internal Control ◽  
Control Procedure ◽  
Economic Entity ◽  
It Systems ◽  
Internal Control System ◽  
The Subject ◽  
The One ◽  
Definition Of

The internal control system is examined as a variety of internal control of an economic entity on the one hand, and as the foundation for transitioning towards tax monitoring on the other. Such approach allows assessing this structure from the perspective of taxpayers, as well as from the standpoint of implementation of public function of tax control. The object of this article is the process of improving internal control system of tax obligations by the taxpayer in the conditions of digitalization of tax administration. The subject of this article is the theoretical aspects of internal control as an administrative function, as well as comparative analysis of the Russian “internal control” system with the classical COSO model. The scientific novelty consists in comprehensive research of the internal control of tax obligations, determination of its essential characteristics,  and assessment of the consequences of formalization of requirements thereof, which led to the conclusion on transformation of the internal control of the taxpayer from the area of reputational merits of the economic entity and internal administration instruments to the subject of public control by tax authorities in tax monitoring processes. It remains to be seen whether state interference in such delicate sphere of activity of an economic entity as internal control is justified. The goal of this research consists in the analysis of the effective requirements of the Federal Tax Service of Russia from the perspective of possibility of their implementation by the particular taxpayers. The article provides the examples of assessment of certain components of the internal control system based on the criteria set by the Federal Tax Service of Russia. The author formulates the definition of control procedure, carries out classification of the aforementioned criteria; develops the examples of effective design of some controls; as well as presents the examples of assessment of IT systems from in the context of extended requirements of the Federal Tax Service of Russia.

scholarly journals Determination of mechanical properties of materials used for 3D printing

2020 ◽  
Vol 20 (2) ◽  
pp. 190-194
Author(s):  
Josef Sedlak ◽  
Josef Chladil ◽  
Martin Cerny ◽  
Ales Polzer ◽  
Matus Varhanik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Mechanical Properties Of Materials ◽  
Properties Of Materials ◽  
Materials Used

scholarly journals Evolution of Floor Construction System in Beirut (1840-1940)

2020 ◽  
Vol 3 (2) ◽  
pp. p12
Author(s):  
Jad Hammoud ◽  
Elise Abi Rached
Keyword(s):  
Architectural Design ◽  
Late Nineteenth Century ◽  
Structural Systems ◽  
Construction Techniques ◽  
French Mandate ◽  
Structural Principles ◽  
The Subject ◽  
Materials Used ◽  
Late Ottoman

This article is going to deal with the evolution of floor structural systems; traditional structural systems during the late Ottoman period and the concrete structural systems during the French mandate period in Beirut. Beyond this, natural constraint timber materials used in the late nineteenth century and the available concrete materials used in the early twentieth century can direct influence the evolution of the floor structural systems which became an integral part of architectural design and typology. Structural principles of traditional floor construction techniques will be characterized and assessed in eight case studies tracing its structural systems in terms of their evolution. The subject matter will be approached in a descriptive manner for floor structural systems and the determination of mechanical properties of timber.

Sign in / Sign up

Export Citation Format

Share Document