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Détails du magazine
Format
Magazine
eISSN
1338-3973
ISSN
1210-3896
Première publication
23 May 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 24 (2016): Edition 2 (June 2016)

Détails du magazine
Format
Magazine
eISSN
1338-3973
ISSN
1210-3896
Première publication
23 May 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

5 Articles
access type Accès libre

Assessment of the Ecological Stability of the Village of Bielovce as a Result of to Changes in Land Use

Publié en ligne: 08 Jul 2016
Pages: 1 - 6

Résumé

Abstract

Globally, the human population is growing, which causes increasing demands on landscapes. Human activity significantly influences the ecological balance, especially in the negative. Ecological stability is the basis for assessments of all environmental conditions and for assessments according to new land uses. The area of interest is evaluated according to both positive and negative factors. There are many methodologies for calculating ecological stability, e.g., Muchová et al. (2009); Řeháčková - Pauditšová (2007); Kupková (2002); Streďanský et al. (1995) and Löw et al. (1984).

The aim of this paper is to compare the works of the mentioned authors concerning the ecological stability of the district of Levice (Slovakia), specifically in the municipal cadastre region of Bielovce. The land uses of this territory have changed during some periods. We compared the state of the land uses in the years 1950, 2012 and 2014. During this period, the proportion of arable land increased, and the proportion of forest decreased. In the area of interest, the ecological stability increased, but not as significantly as we expected. The processed data were prepared in GIS.

Mots clés

  • ecological stability
  • methodological procedures
  • coefficient of ecological stability
access type Accès libre

Valorisation of Sugarcane Bagasse Ash in the Manufacture of Lime-Stabilized Blocks

Publié en ligne: 08 Jul 2016
Pages: 7 - 15

Résumé

Abstract

The study investigated the potential of lime in the manufacture of stabilized soil blocks and the valorisation of a solid waste, Bagasse Ash (BA), in its manufacture. A locally available soil was collected from a field and characterized in the soil laboratory as a clay of intermediate plasticity. This soil was stabilized using lime, the quantity of which was determined from the Eades and Grim pH test. The soil was stabilized using this lime content, amended with various BA contents during mixing, and moulded into blocks of 19 cm x 9 cm x 9 cm. The blocks were then moist cured for a period of 28 days, following which they were subjected to compressive strength, water absorption and efflorescence tests. The results of the tests revealed that the addition of BA resulted in enhanced compressive strength of the blocks, increased the water absorption marginally, and resulted in no efflorescence in any of the combinations, although the limited combinations in the study could not produce enough strength to meet the specifications of the Bureau of Indian Standards. The study revealed that BA can be effectively valorised in the manufacture of stabilized soil blocks.

Mots clés

  • stabilized soil blocks
  • lime
  • bagasse ash
  • compressive strength
  • water absorption
  • efflorescence
access type Accès libre

Analysis of Indoor Environment in Classroom Based on Hygienic Requirements

Publié en ligne: 08 Jul 2016
Pages: 16 - 22

Résumé

Abstract

The article contains the analysis of experimental ventilation measurement in selected classrooms of the Elementary School Štrba. Mathematical model of selected classroom was prepared according to in-situ measurements and air exchange was calculated. Interior air temperature and quality influences the students ´ comfort. Evaluated data were compared to requirements of standard (STN EN 15251,2008) applicable to classroom indoor environment during lectures, highlighting the difference between required ambiance quality and actually measured values. CO2 concentration refers to one of the parameters indicating indoor environment quality.

Mots clés

  • natural ventilation
  • air exchange
  • indoor environment
  • elementary school buildings
access type Accès libre

Dynamic Characteristics of a Model and Prototype for 3D-RC Structure

Publié en ligne: 08 Jul 2016
Pages: 23 - 30

Résumé

Abstract

Infill walls provide durable and economical partitions that have relatively excellent thermal and sound insulation with high fire resistance. Monolithic infilled walls are provided within RC structures without being analyzed as a combination of concrete and brick elements, although in reality they act as a single unit during earthquakes. The performance of such structures during earthquakes has proved to be superior in comparison to bare frames in terms of stiffness, strength and energy dissipation. To know the dynamic characteristics of monolithic infill wall panels and masonry infill, modal, response spectrum and time history analyses have been carried out on a model and prototype of a 3D RC structure for a comparative study.

Mots clés

  • model
  • monolithic infill
  • masonry infill
access type Accès libre

Soil-Water Storage Predictions for Cultivated Crops on the Záhorská Lowlands

Publié en ligne: 08 Jul 2016
Pages: 31 - 40

Résumé

Abstract

The main objective of this paper is to evaluate the impact of climate change on the soil-water regime of the Záhorská lowlands. The consequences of climate change on soil-water storage were analyzed for two crops: spring barley and maize. We analyzed the consequences of climate change on soil-water storage for two crops: spring barley and maize. The soil-water storage was simulated with the GLOBAL mathematical model. The data entered into the model as upper boundary conditions were established by the SRES A2 and SRES B1 climate scenarios and the KNMI regional climate model for the years from 2071 to 2100 (in the text called the time horizon 2085 which is in the middle this period). For the reference period the data from the years 1961-1990 was used. The results of this paper predict soil-water storage until the end of this century for the crops evaluated, as well as a comparison of the soil-water storage predictions with the course of the soil-water storage during the reference period.

Mots clés

  • model
  • climate scenarios
  • time horizon
  • climate change
5 Articles
access type Accès libre

Assessment of the Ecological Stability of the Village of Bielovce as a Result of to Changes in Land Use

Publié en ligne: 08 Jul 2016
Pages: 1 - 6

Résumé

Abstract

Globally, the human population is growing, which causes increasing demands on landscapes. Human activity significantly influences the ecological balance, especially in the negative. Ecological stability is the basis for assessments of all environmental conditions and for assessments according to new land uses. The area of interest is evaluated according to both positive and negative factors. There are many methodologies for calculating ecological stability, e.g., Muchová et al. (2009); Řeháčková - Pauditšová (2007); Kupková (2002); Streďanský et al. (1995) and Löw et al. (1984).

The aim of this paper is to compare the works of the mentioned authors concerning the ecological stability of the district of Levice (Slovakia), specifically in the municipal cadastre region of Bielovce. The land uses of this territory have changed during some periods. We compared the state of the land uses in the years 1950, 2012 and 2014. During this period, the proportion of arable land increased, and the proportion of forest decreased. In the area of interest, the ecological stability increased, but not as significantly as we expected. The processed data were prepared in GIS.

Mots clés

  • ecological stability
  • methodological procedures
  • coefficient of ecological stability
access type Accès libre

Valorisation of Sugarcane Bagasse Ash in the Manufacture of Lime-Stabilized Blocks

Publié en ligne: 08 Jul 2016
Pages: 7 - 15

Résumé

Abstract

The study investigated the potential of lime in the manufacture of stabilized soil blocks and the valorisation of a solid waste, Bagasse Ash (BA), in its manufacture. A locally available soil was collected from a field and characterized in the soil laboratory as a clay of intermediate plasticity. This soil was stabilized using lime, the quantity of which was determined from the Eades and Grim pH test. The soil was stabilized using this lime content, amended with various BA contents during mixing, and moulded into blocks of 19 cm x 9 cm x 9 cm. The blocks were then moist cured for a period of 28 days, following which they were subjected to compressive strength, water absorption and efflorescence tests. The results of the tests revealed that the addition of BA resulted in enhanced compressive strength of the blocks, increased the water absorption marginally, and resulted in no efflorescence in any of the combinations, although the limited combinations in the study could not produce enough strength to meet the specifications of the Bureau of Indian Standards. The study revealed that BA can be effectively valorised in the manufacture of stabilized soil blocks.

Mots clés

  • stabilized soil blocks
  • lime
  • bagasse ash
  • compressive strength
  • water absorption
  • efflorescence
access type Accès libre

Analysis of Indoor Environment in Classroom Based on Hygienic Requirements

Publié en ligne: 08 Jul 2016
Pages: 16 - 22

Résumé

Abstract

The article contains the analysis of experimental ventilation measurement in selected classrooms of the Elementary School Štrba. Mathematical model of selected classroom was prepared according to in-situ measurements and air exchange was calculated. Interior air temperature and quality influences the students ´ comfort. Evaluated data were compared to requirements of standard (STN EN 15251,2008) applicable to classroom indoor environment during lectures, highlighting the difference between required ambiance quality and actually measured values. CO2 concentration refers to one of the parameters indicating indoor environment quality.

Mots clés

  • natural ventilation
  • air exchange
  • indoor environment
  • elementary school buildings
access type Accès libre

Dynamic Characteristics of a Model and Prototype for 3D-RC Structure

Publié en ligne: 08 Jul 2016
Pages: 23 - 30

Résumé

Abstract

Infill walls provide durable and economical partitions that have relatively excellent thermal and sound insulation with high fire resistance. Monolithic infilled walls are provided within RC structures without being analyzed as a combination of concrete and brick elements, although in reality they act as a single unit during earthquakes. The performance of such structures during earthquakes has proved to be superior in comparison to bare frames in terms of stiffness, strength and energy dissipation. To know the dynamic characteristics of monolithic infill wall panels and masonry infill, modal, response spectrum and time history analyses have been carried out on a model and prototype of a 3D RC structure for a comparative study.

Mots clés

  • model
  • monolithic infill
  • masonry infill
access type Accès libre

Soil-Water Storage Predictions for Cultivated Crops on the Záhorská Lowlands

Publié en ligne: 08 Jul 2016
Pages: 31 - 40

Résumé

Abstract

The main objective of this paper is to evaluate the impact of climate change on the soil-water regime of the Záhorská lowlands. The consequences of climate change on soil-water storage were analyzed for two crops: spring barley and maize. We analyzed the consequences of climate change on soil-water storage for two crops: spring barley and maize. The soil-water storage was simulated with the GLOBAL mathematical model. The data entered into the model as upper boundary conditions were established by the SRES A2 and SRES B1 climate scenarios and the KNMI regional climate model for the years from 2071 to 2100 (in the text called the time horizon 2085 which is in the middle this period). For the reference period the data from the years 1961-1990 was used. The results of this paper predict soil-water storage until the end of this century for the crops evaluated, as well as a comparison of the soil-water storage predictions with the course of the soil-water storage during the reference period.

Mots clés

  • model
  • climate scenarios
  • time horizon
  • climate change

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