Differences in the Properties of Arenaceous Marlstones from Different Quarries

2014 ◽  
Vol 982 ◽  
pp. 149-153
Author(s):  
Eva Vejmelková ◽  
Monika Čáchová ◽  
Dana Koňáková ◽  
Martin Keppert ◽  
Pavel Reiterman ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Czech Republic ◽  
Open Porosity ◽  
Sedimentary Rock ◽  
Building Materials ◽  
Point Of View ◽  
Historical Buildings ◽  
Similar Material ◽  
The Czech Republic ◽  
Hygric Properties

In this article two arenaceous marlstones quarried in Czech Republic were compared. Thanks to its easy workability and many deposits, arenaceous marlstone belonged to the main building materials in Roman and Gothic style. In the Czech Republic many interesting historical buildings from this period still exist, and they need to be sometimes repaired. It is important to use similar material for conservation of historical values of these monuments. From the geological point of view arenaceous marlstone is sedimentary rock containing loamy and silty particles. But as it was proved in this study two functioning quarries in the Czech Republic supply two materials with extremely different properties. Open porosity varies by about 33%, compressive strength by about 65% and also thermal and hygric properties are almost incomparable.

Protistátní trestné činy v moderních kodifikacích

2021 ◽  
Author(s):  
David Kolumber
Keyword(s):  
Czech Republic ◽  
Soviet Union ◽  
Point Of View ◽  
The Other ◽  
The Czech Republic ◽  
Other Hand ◽  
Legal Concepts ◽  
Atlantic Area ◽  
Current Arrangement

The contribution “Anti-state Crimes in Modern Codifications” deals with the topic of anti-state crimes during centuries. Firstly, legal concepts in the pre-state period are mentioned. Then the attention is paid on the evolution of this institute in the Euro-Atlantic area. From this point of view, there are mentioned mainly regulations from England (1351), France (1810), Germany (1871) and Soviet Union (1958) which could be remarked as the most important for the development of other countries. On the other hand, it also reminds the development of codifications in Czechoslovakia, the Czech Republic and Slovakia, which were affected by the Austro-Hungarian legislations as well as German and Soviet approaches. The Czech current arrangement generally does not depart from the other European samples, but it cannot be omitted that in the Czech Republic it is distinguished the penal concept of the high treason (Landesverrat, vlastizrada) from the constitutional concept (Hochverrat, velezrada) which is dedicated to the presidential anti-state activities. The contribution also indicates that the concept of anti-state crimes in countries has not been unified and it has been varying according to various experiences and attitudes.

Situation of brownfields in selected regions in the Czech Republic

2021 ◽  
Author(s):  
Jaroslav Škrabal ◽  
Petra Chmielová
Keyword(s):  
Czech Republic ◽  
Point Of View ◽  
National Database ◽  
Agricultural Activities ◽  
The South ◽  
The Czech Republic ◽  
Industrial Activities ◽  
The Given ◽  
Geographical Point

The aim of the article is to make a comparison of brownfields in the South Moravian, Olomouc, Zlín and Moravian-Silesian regions based on the spatial standpoint. Data on brownfields were obtained through the National Database of Brownfields, which is managed by the CzechInvest agency. Information about these abandoned buildings and grounds were dated on 31st March 2021. The finding of the contribution is the fact that the most abandoned buildings and areas are mainly in Moravian-Silesian and South Moravian Region. Most of brownfields are after industrial activities, civic amenities and agricultural activities. In the given article, the analysis of brownfields according to individual indicators was performed on the basis of spatial and geographical point of view. It was found that most of the examined abandoned buildings and areas are located mainly in cities, which were followed by municipalities. Furthermore, it was proved that the size of brownfields from 54% is in area up to 1 (ha). The following indicator was the distance of abandoned buildings and areas from the centre of the cadastral area. Based on the results, it was found that 45% of the analysed brownfields are located 1-3 km from the centre of the cadastral area.

Developing Environmentally Sustainable and Cost-Effective Geopolymer Concrete with Improved Characteristics

2021 ◽  
Vol 13 (24) ◽  
pp. 13607
Author(s):  
Alexey N. Beskopylny ◽  
Sergey A. Stel’makh ◽  
Evgenii M. Shcherban’ ◽  
Levon R. Mailyan ◽  
Besarion Meskhi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Cost Effective ◽  
Point Of View ◽  
Strength Characteristics ◽  
Geopolymer Concrete ◽  
Environmental Friendliness ◽  
Fine Grained ◽  
The Individual ◽  
Capital Construction

Improving the efficiency and quality of construction mainly depends on the cost of building materials, which is about 55–65% of total capital-construction costs. The study aimed to obtain geopolymer fine-grained concrete with improved quality characteristics that meet the construction field’s sustainable development criteria and that have environmental friendliness, economic efficiency, and advantages over competing analogues. The dependences of strength characteristics on various compositions of geopolymer concrete were obtained. It was found that the most effective activator is a composition of NaOH and Na2SiO3 with a ratio of 1:2. The increase in the indicators of the obtained geopolymer concrete from the developed composition (4A) in relation to the base control (1X) was 17% in terms of compressive strength and 24% in tensile strength in bending. Polynomial equations were obtained showing the dependence of the change in the strength characteristics of geopolymer concrete on the individual influence of each of the activators. A significant effect of the composition of the alkaline activator on the strength characteristics of geopolymer fine-grained concrete was noted. The optimal temperature range of heat treatment of geopolymer concrete samples, contributing to the positive kinetics of compressive strength gain at the age of 28 days, was determined. The main technological and recipe parameters for obtaining geopolymers with the desired properties, which meet the ecology requirements and are efficient from the point of view of economics, were determined.

Electricity supplier selection by a household in the Czech Republic in 2017 and 2018 – Monte Carlo simulation approach

2019 ◽  
Author(s):  
Martina Kuncova
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Czech Republic ◽  
Electricity Market ◽  
Electricity Consumption ◽  
Point Of View ◽  
The Czech Republic ◽  
Extra Effort ◽  
The Individual ◽  
Monte Carlo Simulation Model

The situation on the electricity retail market in the Czech Republic is not clear because of the number of suppliers and its products. Although the information about the prices for the electricity consumption for households is available on the web and each household can change the supplier nearly with no extra effort and cost, households are still often not familiar with the individual price items of the products. In this article the analysis of the Czech electricity market from the distribution rate D25d point of view is made for the years 2017-2018 when the household annual consumption is simulated via Monte Carlo simulation model. The aim of this paper is to select such a supplier and product that minimizes the total costs of the electricity for a household for the selected distribution rate and compare it with the results from the previous years.

scholarly journals Mining processes of brick products in the Czech Republic

2020 ◽  
Vol 168 ◽  
pp. 00007
Author(s):  
Jan Fiala ◽  
Miroslav Lapka ◽  
Jan Fiala jun ◽  
Milan Mikolas
Keyword(s):  
New York ◽  
Czech Republic ◽  
Building Materials ◽  
Process Mining ◽  
Ceramic Product ◽  
The Czech Republic ◽  
Building Product ◽  
The World ◽  
Mining Methods ◽  
Great Wall

First technological process, which ceramic producers of ceramic products use for their future ceramic product is mining process. Mining methods, Transport methods and processing methods are basic technological processes. The process of drying, firing and shaping of brick products are specific. Babylonian gardens, Hagia Sofia, are one of the most beautiful churches that has ever been built. The great Wall of China, medieval castle Malbork from northern Poland not far from Gdansk`s bay which resembles small town, Skyscraper Chrysler Building in New York are the outstanding brick creations in the world. All of these buildings have one thing in common and that is material from which they were built. The material is brick, one of the simplest, the most beautiful, the most universal and the oldest building product which is known for moreover than 10 000 years [1]. Brick association of Czech and Moravia, nowadays unites 6 regular members with 19 plants where are created fired building materials. Furthermore it unites 7 associated members who ensure various services for brickmakers and 7 honorary members. Producers, members of brick association represent 92 % of Mason material capacity in the Czech Republic and 100 % of fired roofing tile capacity.

scholarly journals Bird mortality on medium-voltage power lines in the Czech Republic

2019 ◽  
Vol 13 (1) ◽  
pp. 27-44
Author(s):  
Vlasta Škorpíková ◽  
Václav Hlaváč ◽  
Milan Křápek
Keyword(s):  
Czech Republic ◽  
Point Of View ◽  
The Other ◽  
Power Lines ◽  
Mitigation Measures ◽  
Birds Of Prey ◽  
The Czech Republic ◽  
Medium Voltage ◽  
Bird Mortality ◽  
Straight Lines

Abstract In 2015–2016, 6,429 km medium-voltage power lines with 76,430 pylons were checked for bird mortality in the Czech Republic. 1,326 bird victims of power lines were found, 156 of which died after collisions, and 1,170 birds were electrocuted. They belonged to 60 species from 12 orders, and birds of prey made up almost half of all victims. Steel pylons bearing several cross-arms including upper and crosswise jumpers were identified as most dangerous from the electrocution point of view. On the other hand, pylons in straight lines with Pařát cross-arms (triangular arrangement of conductors without any horizontal bar) were among the least dangerous, and when they had a simple perch fitted below the cross-arm, no mortality was recorded. But these pylons are new in practice and despite becoming widely used recently, they form less than one tenth of all pylons in the Czech Republic. On other pylons various types of mitigation measures have been installed. Commonly used plastic covers and plastic strips have proved to be especially effective, but only in cases when they are undamaged and correctly installed.

Development of Concretes with Resistance to High Temperatures in the Czech Republic and Surrounding European Countries

2013 ◽  
Vol 651 ◽  
pp. 120-125 ◽  
Author(s):  
Lenka Bodnárová ◽  
Jiri Zach ◽  
Jitka Hroudová ◽  
Jaroslav Válek
Keyword(s):  
Czech Republic ◽  
High Temperatures ◽  
Nuclear Power ◽  
Power Plants ◽  
Building Materials ◽  
European Countries ◽  
Terrorist Attacks ◽  
Load Bearing Capacity ◽  
The Czech Republic ◽  
The Stability

The resistance of concrete constructions to high temperatures at present is a much monitored issue for many scientific teams and experts in the stated area. This fact is mainly caused by fatal consequences originating in the case when concrete constructions are loaded by the effect of fire and consequent loss of their load-bearing capacity, for the population and the environment of our planet, in which we live in. The development of society goes hand in hand with the development of new building materials and as a consequence the requirements for building constructions increase which bring about extraordinary strict regulations in the area of fire safety. So, many high, non-traditional or specific constructions originate, e.g. nuclear power plants due to permanently higher demand for transport linkage and many tunnels have originated between European countries as a result. Unfortunately, in this relation the threat of terrorist attacks increases and unexpected natural disasters which also threaten the stability of the mentioned constructions. The objective of the article is to familiarize readers with the results of research concerning the improvement of the resistance of the concrete to high temperatures originated during fire instances.

scholarly journals Do Sociodemographic Characteristics in Waste Management Matter? Case Study of Recyclable Generation in the Czech Republic

2019 ◽  
Vol 11 (7) ◽  
pp. 2030 ◽  
Author(s):  
Kristyna Rybova
Keyword(s):  
Czech Republic ◽  
Social Life ◽  
Developed Countries ◽  
Individual Characteristics ◽  
Point Of View ◽  
Situational Factors ◽  
Sociodemographic Characteristics ◽  
Spatial Effects ◽  
Waste Generation ◽  
The Czech Republic

The generation of recyclables in the Czech Republic has long been under the European average, but the proportion from municipal waste as a whole has been growing over the past few years. Previous research in the Czech Republic mainly focused on organizational or situational factors explaining recycling performance in municipalities. This study focuses on individual characteristics that are connected, among other things, to ongoing demographic changes. Currently ongoing sociodemographic development in the Czech Republic, as well as other developed countries, influence a broad range of aspects of social life, including waste generation and its structure. This paper aims at quantifying the relation between the sociodemographic characteristics of municipality inhabitants and recyclable generation. For this purpose, 13 variables describing inhabitants, households, and housing in 4897 Czech municipalities were selected that could influence the generation of recyclables according to foreign studies. Data were analyzed using multidimensional linear regression. Even though the resulting model only explains 9%, it is statistically significant and implies that sociodemographic variables can help explain recyclable generation. From this point of view, important variables are average household size, share of tertiary educated people, share of family houses, purchasing power per person, percentage of people employed in agriculture, and sex ratio. To increase the explained variability and emphasize local differences in recyclable generation, we also used geographically weighted regression (GWR). GWR results show that, to understand waste generation (at least in the Czech Republic) on a municipal level, it is necessary to also consider spatial effects and regional specifics.

COMPARISON OF POLISH, CZECH AND SLOVAK SKI RESORTS USING THE FREE DISPOSABLE HULL ANALYSIS

2017 ◽  
Vol 45 ◽  
pp. 11-31
Author(s):  
Marek Nowacki
Keyword(s):  
Czech Republic ◽  
Quality Index ◽  
Principal Component ◽  
Nonparametric Test ◽  
Point Of View ◽  
Web Pages ◽  
Value For Money ◽  
The Czech Republic ◽  
Ski Resorts ◽  
The Impact

Purpose. The aim of this study is: (1) to compare the features of ski resorts in Poland, the Czech Republic and Slovakia in relation to the prices of ski passes, (2) to indicate the best ski resorts in these countries in terms of value for money - the ratio of offered quality to the price of ski passes, (3) to compare of differences in value for money (e.g. offered quality compared to the price of a ski pass) in these countries. Method. Data for analysis were features of quality and prices of one-day ski passes for 245 ski resorts in Poland, the Czech Republic and Slovakia. The data was obtained from the websites of the surveyed ski resorts and web pages: skiinfo.pl, holidayinfo.cz and holidayinfo.sk. The quality index of ski resorts was constructed using Principal Component Analysis of the seventeen quality features regarding the studied resorts. The comparison of ski resorts was conducted using the Free Disposable Hull analysis. Differences in the level of quality of the resorts' and ski pass prices were calculated using the Kruskal-Wallis H nonparametric test. Findings. Eleven features of the eighteen surveyed locations were differentiated between surveyed countries (including the price of the ski pass: Polish ski passes are the most expensive and the cheapest are in Slovakia). The FDH analysis revealed the existence of eight effective – from the skiers' point of view – ski resorts, i.e. those that offer the given quality at the lowest price (value for money). Polish ski resorts are characterized by significantly higher quality than Czech or Slovak resorts. Research and conclusion limitations. The analysis did not take the impact that congestion and queues to lifts, prices of accommodation, restaurants and nightlife in the resort (except night skiing) might have had on the skiers decision into account. The results may also be influenced by the method of quality index construction. Practical implications. The results of FDH analysis enable the identification of inefficient ski resorts in the analysed countries and indication of the differences existing in terms of quality between ski resorts. The conclusions allow to select the most efficient ski resorts which can be helpful in the design of tourist offers and it may also indicate the need for adjustments in prices of ski passes at some ski resorts. Originality. No comparative analyses of Polish, Czech and Slovak ski resorts were found in the literature to date. Type of paper. The article presents the results of empirical research.

Waste Building Materials to Roads in Czech Republic

2016 ◽  
Vol 832 ◽  
pp. 10-17
Author(s):  
Dušan Stehlík ◽  
Petr Hyzl ◽  
Michal Varaus
Keyword(s):  
Sustainable Development ◽  
Czech Republic ◽  
Building Material ◽  
Building Materials ◽  
Recycled Aggregate ◽  
Research Projects ◽  
Research Focus ◽  
The Czech Republic ◽  
Granular Mixtures

Using waste building materials in pavements is one of the goals of transportation sustainable development in the Czech Republic. As part of research projects of the Technology Agency of the Czech Republic, a project was devised, which focused on maximal utilization of waste building materials when constructing pavements. After the initial verification of properties of the recycled aggregate (especially concrete waste building material), the research focus shifted towards the utilization of these waste building materials in cement bound granular mixtures.

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