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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 22 (2014): Edition 2 (June 2014)

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
Accès libre

Comparison of a Wooden House and a Porous Concrete Masonry House

Publié en ligne: 15 Jul 2014
Pages: 1 - 6

Résumé

Abstract

This paper deals with an evaluation of an existing wooden panel house and its comparison with alternative material composition (porous concrete masonry house). The criteria for evaluation are the energy performance, size of the usable area, environmental impact and final costs.

Mots clés

  • Wooden house
  • porous concrete house
  • environmental indicators OI3
  • building energy balance
  • final costs
Accès libre

Groundwater Quality in the Shallow Aquifers of the Hadauti Plateau of the District of Baran, Rajasthan, India

Publié en ligne: 15 Jul 2014
Pages: 7 - 14

Résumé

Abstract

With the rapid pace of agricultural development, industrialization and urbanization, the commonly observed geogenic contaminants in groundwater are fluoride and nitrate, whereas nitrate is the dominant anthropogenic contaminant in the south-eastern plains of Rajasthan, India. Samples obtained using a tube well and hand pump in November, 2012, demonstrate that Na-Cl is the dominant salt in the groundwater, and the total salinity of the water is between 211-1056 mg L-1. Moreover, the observed sodium adsorption ratio (SAR) and residual sodium carbonate (RSC) values ranged between 0.87 to 26.22 meq L-1 and -12.5 to 30.5 meq L-1 respectively. The study further shows that 6% of the total samples contain high amounts of nitrate, and 49% contain fluoride. A water quality index (WQI) rating was carried out using nine parameters to quantify the overall groundwater quality status of the area.

Mots clés

  • Groundwater quality
  • shallow aquifers
  • physicochemical parameters
Accès libre

Numerical MLPG Analysis of Piezoelectric Sensor in Structures

Publié en ligne: 15 Jul 2014
Pages: 15 - 20

Résumé

Abstract

The paper deals with a numerical analysis of the electro-mechanical response of piezoelectric sensors subjected to an external non-uniform displacement field. The meshless method based on the local Petrov-Galerkin (MLPG) approach is utilized for the numerical solution of a boundary value problem for the coupled electro-mechanical fields that characterize the piezoelectric material. The sensor is modeled as a 3-D piezoelectric solid. The transient effects are not considered. Using the present MLPG approach, the assumed solid of the cylindrical shape is discretized with nodal points only, and a small spherical subdomain is introduced around each nodal point. Local integral equations constructed from the weak form of governing PDEs are defined over these local subdomains. A moving least-squares (MLS) approximation scheme is used to approximate the spatial variations of the unknown field variables, and the Heaviside unit step function is used as a test function. The electric field induced on the sensor is studied in a numerical example for two loading scenarios.

Mots clés

  • Meshless Local Petrov-Galerkin (MLPG) method
  • MLS approximation
  • piezoelectric solids
  • induced electric field
Accès libre

Determination of Chlorine Dioxide and Chlorite in Water Supply Systems by Verified Methods

Publié en ligne: 15 Jul 2014
Pages: 21 - 28

Résumé

Abstract

This work is dedicated to the development and optimization of appropriate analytical methods for the determination of chlorine dioxide and chlorite in drinking water in order to obtain accurate and correct results in the quality control of drinking water. The work deals with the development and optimization of a method for the determination of chlorine dioxide using chlorophenol red. Furthermore, a new spectrophotometric method for the determination of chlorite via bromometry using methyl orange was developed, optimized and validated. An electrochemical method for the determination of chlorite by flow coulometry was also developed, optimized and validated.

Mots clés

  • Chlorine dioxide
  • chlorite
  • methods of determination
  • DBPs
Accès libre

Evaluation of the Aggressiveness of Slovak Mineral Water Sources

Publié en ligne: 15 Jul 2014
Pages: 29 - 36

Résumé

Abstract

The aggressive properties of natural waters arise due to their specific physical properties and chemical composition. The latest analyses of certified natural and healing mineral water sources according to Act No. 538/2005 were used for the evaluation. A total of 53 sources in 26 localities were evaluated; they comprised 25 sources of bottled natural mineral and healing waters and 28 sources of natural healing waters in 9 spas. The aggressiveness of the water against concrete was weak (17 sources), medium (17 sources), or none (19 sources). The aggressiveness was mostly caused by low pH values and/or increased SO42− content. Their corrosiveness to metal was mostly very high. The results showed that the disintegration of concrete building constructions, well casings and pipelines could occur in most of the evaluated localities in the case of mineral water contacting them. Therefore, preventive measures are necessary.

Mots clés

  • Concrete and metal constructions
  • water aggressiveness
  • physical properties
  • chemical composition
  • certified natural healing and mineral water sources of Slovakia
5 Articles
Accès libre

Comparison of a Wooden House and a Porous Concrete Masonry House

Publié en ligne: 15 Jul 2014
Pages: 1 - 6

Résumé

Abstract

This paper deals with an evaluation of an existing wooden panel house and its comparison with alternative material composition (porous concrete masonry house). The criteria for evaluation are the energy performance, size of the usable area, environmental impact and final costs.

Mots clés

  • Wooden house
  • porous concrete house
  • environmental indicators OI3
  • building energy balance
  • final costs
Accès libre

Groundwater Quality in the Shallow Aquifers of the Hadauti Plateau of the District of Baran, Rajasthan, India

Publié en ligne: 15 Jul 2014
Pages: 7 - 14

Résumé

Abstract

With the rapid pace of agricultural development, industrialization and urbanization, the commonly observed geogenic contaminants in groundwater are fluoride and nitrate, whereas nitrate is the dominant anthropogenic contaminant in the south-eastern plains of Rajasthan, India. Samples obtained using a tube well and hand pump in November, 2012, demonstrate that Na-Cl is the dominant salt in the groundwater, and the total salinity of the water is between 211-1056 mg L-1. Moreover, the observed sodium adsorption ratio (SAR) and residual sodium carbonate (RSC) values ranged between 0.87 to 26.22 meq L-1 and -12.5 to 30.5 meq L-1 respectively. The study further shows that 6% of the total samples contain high amounts of nitrate, and 49% contain fluoride. A water quality index (WQI) rating was carried out using nine parameters to quantify the overall groundwater quality status of the area.

Mots clés

  • Groundwater quality
  • shallow aquifers
  • physicochemical parameters
Accès libre

Numerical MLPG Analysis of Piezoelectric Sensor in Structures

Publié en ligne: 15 Jul 2014
Pages: 15 - 20

Résumé

Abstract

The paper deals with a numerical analysis of the electro-mechanical response of piezoelectric sensors subjected to an external non-uniform displacement field. The meshless method based on the local Petrov-Galerkin (MLPG) approach is utilized for the numerical solution of a boundary value problem for the coupled electro-mechanical fields that characterize the piezoelectric material. The sensor is modeled as a 3-D piezoelectric solid. The transient effects are not considered. Using the present MLPG approach, the assumed solid of the cylindrical shape is discretized with nodal points only, and a small spherical subdomain is introduced around each nodal point. Local integral equations constructed from the weak form of governing PDEs are defined over these local subdomains. A moving least-squares (MLS) approximation scheme is used to approximate the spatial variations of the unknown field variables, and the Heaviside unit step function is used as a test function. The electric field induced on the sensor is studied in a numerical example for two loading scenarios.

Mots clés

  • Meshless Local Petrov-Galerkin (MLPG) method
  • MLS approximation
  • piezoelectric solids
  • induced electric field
Accès libre

Determination of Chlorine Dioxide and Chlorite in Water Supply Systems by Verified Methods

Publié en ligne: 15 Jul 2014
Pages: 21 - 28

Résumé

Abstract

This work is dedicated to the development and optimization of appropriate analytical methods for the determination of chlorine dioxide and chlorite in drinking water in order to obtain accurate and correct results in the quality control of drinking water. The work deals with the development and optimization of a method for the determination of chlorine dioxide using chlorophenol red. Furthermore, a new spectrophotometric method for the determination of chlorite via bromometry using methyl orange was developed, optimized and validated. An electrochemical method for the determination of chlorite by flow coulometry was also developed, optimized and validated.

Mots clés

  • Chlorine dioxide
  • chlorite
  • methods of determination
  • DBPs
Accès libre

Evaluation of the Aggressiveness of Slovak Mineral Water Sources

Publié en ligne: 15 Jul 2014
Pages: 29 - 36

Résumé

Abstract

The aggressive properties of natural waters arise due to their specific physical properties and chemical composition. The latest analyses of certified natural and healing mineral water sources according to Act No. 538/2005 were used for the evaluation. A total of 53 sources in 26 localities were evaluated; they comprised 25 sources of bottled natural mineral and healing waters and 28 sources of natural healing waters in 9 spas. The aggressiveness of the water against concrete was weak (17 sources), medium (17 sources), or none (19 sources). The aggressiveness was mostly caused by low pH values and/or increased SO42− content. Their corrosiveness to metal was mostly very high. The results showed that the disintegration of concrete building constructions, well casings and pipelines could occur in most of the evaluated localities in the case of mineral water contacting them. Therefore, preventive measures are necessary.

Mots clés

  • Concrete and metal constructions
  • water aggressiveness
  • physical properties
  • chemical composition
  • certified natural healing and mineral water sources of Slovakia

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