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Détails du magazine
Format
Magazine
eISSN
2784-1391
Première publication
12 Apr 2013
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 15 (2019): Edition 1 (March 2019)

Détails du magazine
Format
Magazine
eISSN
2784-1391
Première publication
12 Apr 2013
Période de publication
4 fois par an
Langues
Anglais

Chercher

3 Articles
access type Accès libre

Experimental Investigation of the Relationship Between Noise Level and Thermal Power Inside the Boiler Plant – Study Case

Publié en ligne: 20 Jun 2019
Pages: 1 - 10

Résumé

Abstract

The acoustic comfort of a building or house is typically given little or no attention during project planning and design. This study is aimed at quantifying noise pollution from a building technical room. To attain the research specified result, simultaneous measurements were recorded for the gas flow and noise level in the boiler room. The noise levels were recorded for different operation statuses of the boilers (different thermal loads). It was observed that noise level depends on the thermal load: the increase of thermal load is directly proportional to the noise level inside the plant room). Further, the measured values of the noise level were compared with literature predicted values and the maximum limit values from the Romanian norm. These research findings are useful for mechanical design engineers and architects in order to assure the noise protection and fulfill the residents’ expectations.

Mots clés

  • acoustic comfort
  • noise level
  • measurements
  • boiler plant
access type Accès libre

Determine the Required Log Reductions of Human Intestinal Helminth Eggs by Waste Stabilization Pond: A Simulation for Wastewater Recycling in Agriculture

Publié en ligne: 20 Jun 2019
Pages: 11 - 25

Résumé

Abstract

This paper investigates the determined the required log reductions for human intestinal helminth eggs by waste stabilization ponds as simulation as assessing of mitigating health risk to satisfy practice WHO, 2006 guidelines for the safe use of wastewater in agriculture (≤ 0.1 helminth egg/L) to protect the health of children under 15 years was the development of MATLAB, a computer program based waste stabilization ponds design based on parameter uncertainty and 10,000-trial Monte Carlo simulations were developed for a series of anaerobic, facultative and maturation ponds based on 95%-ile of effluent (≤ 0.1 helminth egg/L) which the result in a health-based target. Whereas the influent of the helminth eggs (Nematode) was (932.500 eggs/L). While the treatment provided (100 % reduction/removal) for the overall treatment process with total hydraulic retention time in climatic conditions of Libya it took 36.207 days in the anaerobic pond, facultative pond, first maturation pond and one of the subsequent maturation pond.

Mots clés

  • Safe re-use wastewater practices
  • Nematode eggs removal in climatic conditions of Libya
  • PC-based Monte Carlo simulation
access type Accès libre

Identifying the Reference Time for Determining the Compressive Strength of Concrete Containing Different Types of Cements

Publié en ligne: 20 Jun 2019
Pages: 26 - 35

Résumé

Abstract

The compressive strength of the concrete measured at 28 days is the criterion for assessing the concrete class, and these values will be acceptable precise indications for other physical and mechanical characteristics of the concrete. In addition to the factors the compressive strength of concrete varies on (such as: the characteristics and proportion of constituents, the placement conditions and subsequent treatment and testing conditions), the concrete class should also depend on the type of cement contained and the concrete strength evolution over time. Due to the fact that concretes with composite cements have a slower evolution of compressive strength and a significant strength increase after 28 days, concretes with different types of cements and mineral admixtures were tested for compression after 28 days in order to determine the reference time for such tests – and thus the concrete’s class.

Mots clés

  • concrete
  • compressive strength of concrete
  • cement with mineral additions
  • reference time
3 Articles
access type Accès libre

Experimental Investigation of the Relationship Between Noise Level and Thermal Power Inside the Boiler Plant – Study Case

Publié en ligne: 20 Jun 2019
Pages: 1 - 10

Résumé

Abstract

The acoustic comfort of a building or house is typically given little or no attention during project planning and design. This study is aimed at quantifying noise pollution from a building technical room. To attain the research specified result, simultaneous measurements were recorded for the gas flow and noise level in the boiler room. The noise levels were recorded for different operation statuses of the boilers (different thermal loads). It was observed that noise level depends on the thermal load: the increase of thermal load is directly proportional to the noise level inside the plant room). Further, the measured values of the noise level were compared with literature predicted values and the maximum limit values from the Romanian norm. These research findings are useful for mechanical design engineers and architects in order to assure the noise protection and fulfill the residents’ expectations.

Mots clés

  • acoustic comfort
  • noise level
  • measurements
  • boiler plant
access type Accès libre

Determine the Required Log Reductions of Human Intestinal Helminth Eggs by Waste Stabilization Pond: A Simulation for Wastewater Recycling in Agriculture

Publié en ligne: 20 Jun 2019
Pages: 11 - 25

Résumé

Abstract

This paper investigates the determined the required log reductions for human intestinal helminth eggs by waste stabilization ponds as simulation as assessing of mitigating health risk to satisfy practice WHO, 2006 guidelines for the safe use of wastewater in agriculture (≤ 0.1 helminth egg/L) to protect the health of children under 15 years was the development of MATLAB, a computer program based waste stabilization ponds design based on parameter uncertainty and 10,000-trial Monte Carlo simulations were developed for a series of anaerobic, facultative and maturation ponds based on 95%-ile of effluent (≤ 0.1 helminth egg/L) which the result in a health-based target. Whereas the influent of the helminth eggs (Nematode) was (932.500 eggs/L). While the treatment provided (100 % reduction/removal) for the overall treatment process with total hydraulic retention time in climatic conditions of Libya it took 36.207 days in the anaerobic pond, facultative pond, first maturation pond and one of the subsequent maturation pond.

Mots clés

  • Safe re-use wastewater practices
  • Nematode eggs removal in climatic conditions of Libya
  • PC-based Monte Carlo simulation
access type Accès libre

Identifying the Reference Time for Determining the Compressive Strength of Concrete Containing Different Types of Cements

Publié en ligne: 20 Jun 2019
Pages: 26 - 35

Résumé

Abstract

The compressive strength of the concrete measured at 28 days is the criterion for assessing the concrete class, and these values will be acceptable precise indications for other physical and mechanical characteristics of the concrete. In addition to the factors the compressive strength of concrete varies on (such as: the characteristics and proportion of constituents, the placement conditions and subsequent treatment and testing conditions), the concrete class should also depend on the type of cement contained and the concrete strength evolution over time. Due to the fact that concretes with composite cements have a slower evolution of compressive strength and a significant strength increase after 28 days, concretes with different types of cements and mineral admixtures were tested for compression after 28 days in order to determine the reference time for such tests – and thus the concrete’s class.

Mots clés

  • concrete
  • compressive strength of concrete
  • cement with mineral additions
  • reference time

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