The Assessment of Reaction to Fire of Crushed Straw

2016 ◽  
Vol 824 ◽  
pp. 148-155 ◽  
Author(s):  
Jiří Teslík ◽  
Martina Vodičková ◽  
Kristýna Kutilová
Keyword(s):  
Building Materials ◽  
Civil Engineering ◽  
Engineering Industry ◽  
Sound Insulation ◽  
Technical Parameters ◽  
Fire Characteristics ◽  
Full Utilization ◽  
Preliminary Classification

To full utilization of crushed straw in civil engineering industry is necessary to know its technical parameters. During previous projects on VŠB – TUO, Faculty of Civil Engineering have found parameters like settlement, thermal conductivity or airborne sound insulation. The research on these parameters have had favorable results, therefore the research is going on and other characteristics of crushed straw are finding out. These days the research team deals with determination of important fire characteristics of crushed straw. Fire characteristics play substantial character by building materials and their design in buildings. Nature materials are generally regarded as flammable. If some material is pressed, the same rule as in the phonebook – if you ignite one sheet of paper, it burns. But if you try to ignite the whole phonebook, it will be not so easy. This article is reported the first step of research on the reaction to fire. This is the preliminary classification of crushed straw into reaction to fire. The test was made according to methods which are described below. There are some changes in methods due to different structures of crushed straw.

scholarly journals EXPERT RESEARCH ON QUALITY DETERMINATION OF ENTRANCE METAL DOORS

2018 ◽  
Vol 18 ◽  
pp. 428-434
Author(s):  
N. A. Matsak ◽  
S. A. Kirilenko ◽  
O. O. Posashkov
Keyword(s):  
Building Materials ◽  
Sound Insulation ◽  
Technical Documentation ◽  
Important Place ◽  
Technical Examination ◽  
Long Time ◽  
Technical Features ◽  
And Storage

The article outlines the mandatory quality requirements for manufactured and installed metal entrance shockproof doors, which should ensure the safety of life, health and property of citizens. The main technical features of these designs and their characteristics are presented. The problem of quality control is considered, since quality is a guarantee of reliability and a guarantee that doors will serve for a long time and reliably. The installation of high-quality "armored" doors will not only protect housing from unauthorized penetration, but also help to isolate the premise from the external environment; therefore in the problem of selecting entrance metal doors, an important place is occupied by the issue of heat and sound insulation. While choosing a good metal door, every detail should be taken into account. The quality of the goods and safety of the premise directly depend on all design components. The article raises such a topical issue as the establishment of quality works on manufacture, storage, transportation and mounting of entrance metal shockproof doors while performing forensic construction and technical examination. The technical characteristics of building materials that can be used in this case are presented. The authors also pointed out that it is very important to resolve disputes on this type of researches, so this is the availability of technical documentation. All data about the product should be included in this documentation up to the information on transportation and storage, since this information will much facilitate the work of experts in the future. After all, the establishment of the quality of this type of products is a fairly complex and time-consuming process. While determining the quality, all details are important, starting from the quality of the used building materials, the works on manufacturing of the door blocks, their storage and transportation conditions, and finishing the placing (mounting).

scholarly journals Ignitability small attack flame fire test of gypsum composite reinforced with natural fibres

2019 ◽  
Vol 10 (1) ◽  
pp. 57-61
Author(s):  
Jiří Teslík ◽  
Markéta Hošťálková ◽  
Nikola Vavřínová
Keyword(s):  
Composite Materials ◽  
Building Materials ◽  
Fire Test ◽  
Natural Fiber ◽  
Natural Fibres ◽  
Fire Tests ◽  
Flame Resistance ◽  
Building Products

Ignitability is one of the parameters that characterize the behaviour of building materials on flame action. The Ignitability Small Attack Flame fire test is used for the classification of building products by their reaction to fire. On the basis of the Ignitability fire test it can be determined that the tested material will be classified into the class E by reaction to fire. The Ignitability Small Attack Flame fire test precede the Single Burning Item fire test, that is used for classification of building products to class D, C, B, A2. The results of the Ignitability fire test were carried out as part of the research on the properties of gypsum composite with natural fiber reinforcement. As part of the research series of ignitability tests on two types of gypsum composite were carried out. The first type was a gypsum composite reinforced with straw fibres. The second type was composite reinforced with wooden fibres. Developed composite materials could be used in the future as board materials and therefore the determination of their fire parameters is a very important part of research. The results of the fire tests have shown that the developed material has a very good flame resistance.

The Effect of Free Joints on Sound Insulation of Constructions

2013 ◽  
Vol 855 ◽  
pp. 233-236 ◽  
Author(s):  
Dušan Dlhý
Keyword(s):  
Mathematical Analysis ◽  
Building Materials ◽  
Civil Engineering ◽  
Sound Insulation ◽  
Wall Structure ◽  
Experimental Measurements ◽  
Acoustical Properties ◽  
External Wall ◽  
Door Frame

Noise protection of a building ́s interior is one of the fundamental functions of building constructions. These constructions can be understood as internal partitions, ceilings or external wall-/roof claddings. However, walls often consist of basic building materials and openings; such windows and doors as well as the acoustical properties of such structures are determined by both parts (e.g., a windows and the wall structure). The acoustical quality of opening is in general affected not only by the particular structure, but also by the concept of the mounting. Acoustical requirements should be applied in all its parts, such as the construction of the window (door) frame, window (door) wing and the realization of the functional gap as well as by application of a sealant. On the base of experimental measurements in Acoustics Chambers of the Faculty of Civil Engineering of Slovak Technical University and mathematical analysis we have determined index of sound insulation of free joint.

THE ESSENCE, THE NEED FOR EVALUATION AND TYPES OF ECONOMIC POTENTIAL OF ENTERPRISES

2017 ◽  
Author(s):  
Olexandr Yemelyanov ◽  
Keyword(s):  
Economic Activity ◽  
Business Strategies ◽  
Enterprise Management ◽  
Value Assessment ◽  
Economic Potential ◽  
Enterprise Value ◽  
Development Assessment ◽  
State Of The Environment

The formation of business strategies of enterprises should be based on a preliminary assessment of their current and future economic opportunities. Such an assessment is to establish the value of the total economic potential of enterprises and its individual varieties. The purpose of this study was to clarify the essence of the economic potential of enterprises, justify the need for its evaluation and selection of its types. The main approaches to interpreting the terms "potential" and "enterprise potential" are identified. These include resource, result, resource-result, resource-target, and result-target concepts. It is established that the potential of any object, including the enterprise, can be interpreted as a set of its external functional properties, which this object shows or can show in a certain state of the environment in which it is located. Accordingly, the assessment of the potential of an object should be based on the identification and determination of its external properties, taking into account the environment in which the object is located. The main situations in which there is a need for information about certain components of the economic potential of the enterprise are identified, and the types of this potential and the consumers of the information about their level, corresponding to these situations, are determined. In particular, such situations include management of production and sales, management of financial and economic results of the enterprise, management of enterprise development, assessment of the company's need for various types of resources, assessment of enterprise value, assessment of current and future impact of the enterprise on the economy of the country (region), etc. The features of classification of types of enterprise potential existing in the scientific literature are supplemented by the following ones: by the main types of economic activity, by the dynamics of changes in the economic and production system of the enterprise, by consequences for the subject of enterprise potential assessment, by the stages of economic activity, enterprise potential, etc. The obtained results make it possible to improve the understanding of the complex patterns that underlie the formation of the economic potential of enterprises.

State Failure and the Political Violence Phenomenon: A Comparative Analysis of Iraq and Syria Cases

2016 ◽  
Vol 4 (2) ◽  
pp. 170 ◽  
Author(s):  
K. Eylem Özkaya Lassalle
Keyword(s):  
Cold War ◽  
Political Violence ◽  
State Failure ◽  
The Political ◽  
Collective Violence ◽  
Short Run ◽  
Definition Of ◽  
The Cold War

The concept of failed state came to the fore with the end of the Cold War, the collapse of the USSR and the disintegration of Yugoslavia. Political violence is central in these discussions on the definition of the concept or the determination of its dimensions (indicators). Specifically, the level of political violence, the type of political violence and intensity of political violence has been broached in the literature. An effective classification of political violence can lead us to a better understanding of state failure phenomenon. By using Tilly’s classification of collective violence which is based on extent of coordination among violent actors and salience of short-run damage, the role played by political violence in state failure can be understood clearly. In order to do this, two recent cases, Iraq and Syria will be examined.

LENS CLASSIFICATION ACCORDING TO THE TYPE OF LIGHT SPOT USING A NEURAL NETWORK

2020 ◽  
Vol 2020 (4) ◽  
pp. 4-14
Author(s):  
Vladimir Budak ◽  
Ekaterina Ilyina
Keyword(s):  
Neural Network ◽  
Light Intensity ◽  
Convolutional Neural Network ◽  
Deep Convolutional Neural Network ◽  
Beam Angle ◽  
New Model ◽  
Technical Parameters ◽  
Transfer Training ◽  
Trained Network

The article proposes the classification of lenses with different symmetrical beam angles and offers a scale as a spot-light’s palette. A collection of spotlight’s images was created and classified according to the proposed scale. The analysis of 788 pcs of existing lenses and reflectors with different LEDs and COBs carried out, and the dependence of the axial light intensity from beam angle was obtained. A transfer training of new deep convolutional neural network (CNN) based on the pre-trained GoogleNet was performed using this collection. GradCAM analysis showed that the trained network correctly identifies the features of objects. This work allows us to classify arbitrary spotlights with an accuracy of about 80 %. Thus, light designer can determine the class of spotlight and corresponding type of lens with its technical parameters using this new model based on CCN.

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