Revista y Edición

Volumen 16 (2021): Edición 4 (December 2021)

Volumen 16 (2021): Edición 3 (September 2021)

Volumen 16 (2021): Edición 2 (June 2021)

Volumen 16 (2021): Edición 1 (March 2021)

Volumen 15 (2019): Edición 4 (December 2019)

Volumen 15 (2019): Edición 3 (September 2019)

Volumen 15 (2019): Edición 2 (June 2019)

Volumen 15 (2019): Edición 1 (March 2019)

Volumen 14 (2018): Edición 4 (December 2018)

Volumen 14 (2018): Edición 3 (September 2018)

Volumen 14 (2018): Edición 2 (June 2018)

Volumen 14 (2018): Edición 1 (March 2018)

Volumen 13 (2017): Edición 4 (December 2017)

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Volumen 12 (2016): Edición 4 (December 2016)

Volumen 12 (2016): Edición 3 (September 2016)

Volumen 12 (2016): Edición 2 (June 2016)

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Volumen 11 (2015): Edición 4 (December 2015)

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Volumen 10 (2014): Edición 4 (December 2014)

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Volumen 10 (2014): Edición 2 (June 2014)

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Volumen 9 (2013): Edición 4 (December 2013)

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Volumen 9 (2013): Edición 2 (June 2013)

Volumen 9 (2013): Edición 1 (March 2013)

Detalles de la revista
Formato
Revista
eISSN
2784-1391
Publicado por primera vez
12 Apr 2013
Periodo de publicación
4 veces al año
Idiomas
Inglés

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Volumen 16 (2021): Edición 3 (September 2021)

Detalles de la revista
Formato
Revista
eISSN
2784-1391
Publicado por primera vez
12 Apr 2013
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

5 Artículos
Acceso abierto

New Methods of Teaching Mathematics in High Schools and Universities

Publicado en línea: 02 Feb 2022
Páginas: 1 - 11

Resumen

Abstract

In this paper, we show a new approach in math teaching. The thing that makes this method different from the older ones is the way the notions are defined. Thus, we start with a practical problem from Physics, Chemistry, Biology, etc. and we try to get a formula to solve that problem. At a moment, we stop the try, because of a lack of theoretical notion. Then, it follows a paragraph in which we define the mathematical notion that we need to solve the given problem. Some properties of the notion and useful formulas are given. After that, we go back to the practical problem and, using the new defined mathematical notion, we solve the problem. We use this technique to define very important mathematical notions, as: derivatives, Riemann integral and differential equations. With these tools, some important problems from the real life can be solved.

Palabras clave

  • derivative
  • the Riemann integral
  • differential equation
Acceso abierto

Development and Parametric Analysis of Human ‘Outdoor’ Thermal Comfort Index for Public Green Spaces in Bengaluru, India

Publicado en línea: 02 Feb 2022
Páginas: 12 - 25

Resumen

Abstract

Urban Warming is an increasing problem in the cities, and inadvertently Thermal Comfort has received an increased attention since the last decade. Compared to indoors, the outdoor environment is more complex and there are larger variations in the climatic parameters. The present research is an effort towards evolving “Human ‘Outdoor’ Thermal Comfort Index”, so as to overcome the limitations of prevalent indices such as ‘Physiological Equivalent Temperature’ and ‘Universal Thermal Climate Index’. The present study was carried out at twenty Public Green Spaces, selected on the basis of geographical location, land use pattern, public prominence, topography and physical area; for 12 hours to monitor Climatic Parameters. The Input parameters included Ambient Air Temperature, Relative Humidity, Wind Speed, Intensity of Sunlight, Green-cover Area; and Public Perception which was ascertained at each observatory with the help of a self-designed compact questionnaire survey. Subsequently, this newly designed empirical relationship was employed for establishing the Thermal Comfort Index of various Public Green Spaces of Bengaluru, with ranking.

Palabras clave

  • Public Green Spaces
  • Thermal
  • Topography
  • Bengaluru
  • Comfort
Acceso abierto

Buckling Loads of Fully Embedded Pile in Clayey Soil Based on the Finite Element Method

Publicado en línea: 02 Feb 2022
Páginas: 26 - 39

Resumen

Abstract

Pile foundations are a well-established means of transferring axial loads applied by a superstructure to rigid soil layers. However, the geometrical characteristics of piles can induce the appearance of the buckling phenomenon when using this type of foundation. Furthermore, buckling is a very important factor in the design of piles, especially when the upper layers are loose or weak soil. Pile buckling is currently one of the more complicated geotechnical problems that engineers and researchers have to deal with. The aim of this work is to analyze the effects of some geometrical, mechanical or geotechnical parameters into the value of critical buckling load of an axially loaded pile totally embedded in a homogeneous soil. In this study, numerical buckling analysis is investigated by using three dimensional finite element analysis. The buckling load was studied for concrete pile. while the modulus of soil reaction is adopted constantly with depth. The Numerical results of the buckling loads of fully embedded pile that obtained by the finite element method and Davisson method are also compared in this paper.

Palabras clave

  • buckling of piles
  • soil-pile system
  • eigenvalue buckling
  • finite element analysis
Acceso abierto

A Combined-Index Study on the Influence of Earthquake Incidence Angle on the Seismic Performance of Reinforced Concrete Plan-Asymmetric Buildings

Publicado en línea: 02 Feb 2022
Páginas: 40 - 54

Resumen

Abstract

A study is performed to estimate the critical seismic incidence angle for a nine-story reinforced concrete dual system building, categorized as plan-asymmetric, by considering a combination of two demand parameters, the Maximum Inter-story Drift (MLID) along the height, and the Seismic Vulnerability Index (SVI). The influence of excitation directionality on the response of the building was investigated by nonlinear dynamic analyses, by applying seven scaled bidirectional ground motion records, oriented in eight incidence angles ranging from 0° to 315°, with a 45° increment. The scaling was made for a peak ground acceleration PGA = 0.30g, according to the elastic response spectrum specified for Bucharest by the Romanian seismic code P100-1/2013. From the results, it was found that the most unfavourable response due to a specific seismic excitation may occur at any angle of incidence, which is not necessarily 0° or 90°, and that the response depends not only on the structural configuration, but also on the excitation characteristics. In addition, the influence of the flexible edge (FE) on the structural demand in terms of SVI was studied. The maximum values for SVI were obtained for the most critical angle of incidence, which is the one that has the higher MLID values in the FE for all accelerograms.

Palabras clave

  • plan-asymmetric building
  • critical incidence angle
  • maximum inter-story drift
  • seismic vulnerability index
Acceso abierto

Kinetics and Chemistry of Nitrification Process – A Review

Publicado en línea: 02 Feb 2022
Páginas: 55 - 65

Resumen

Abstract

Nitrogen is an important nutrient for the survival of all living organisms, as its chemical binding properties allow to create structures from which proteins are built. In nature, nitrogen is found in many forms and its transformation from one form to another is described by the nitrogen cycle. Ammonium is a form of nitrogen that has no direct effects on human health, but its presence in water supply systems may determine bacterial growth in the distribution networks and ultimately can generate degradation of the water quality. Its concentrations in wastewater and water intended for human consumption can be reduced by the biological process of nitrification. The purpose of this paper is to review the equations and the kinetics of the biological nitrification process.

Palabras clave

  • biological process
  • growth rate
  • stoichiometric equations
  • kinetics
5 Artículos
Acceso abierto

New Methods of Teaching Mathematics in High Schools and Universities

Publicado en línea: 02 Feb 2022
Páginas: 1 - 11

Resumen

Abstract

In this paper, we show a new approach in math teaching. The thing that makes this method different from the older ones is the way the notions are defined. Thus, we start with a practical problem from Physics, Chemistry, Biology, etc. and we try to get a formula to solve that problem. At a moment, we stop the try, because of a lack of theoretical notion. Then, it follows a paragraph in which we define the mathematical notion that we need to solve the given problem. Some properties of the notion and useful formulas are given. After that, we go back to the practical problem and, using the new defined mathematical notion, we solve the problem. We use this technique to define very important mathematical notions, as: derivatives, Riemann integral and differential equations. With these tools, some important problems from the real life can be solved.

Palabras clave

  • derivative
  • the Riemann integral
  • differential equation
Acceso abierto

Development and Parametric Analysis of Human ‘Outdoor’ Thermal Comfort Index for Public Green Spaces in Bengaluru, India

Publicado en línea: 02 Feb 2022
Páginas: 12 - 25

Resumen

Abstract

Urban Warming is an increasing problem in the cities, and inadvertently Thermal Comfort has received an increased attention since the last decade. Compared to indoors, the outdoor environment is more complex and there are larger variations in the climatic parameters. The present research is an effort towards evolving “Human ‘Outdoor’ Thermal Comfort Index”, so as to overcome the limitations of prevalent indices such as ‘Physiological Equivalent Temperature’ and ‘Universal Thermal Climate Index’. The present study was carried out at twenty Public Green Spaces, selected on the basis of geographical location, land use pattern, public prominence, topography and physical area; for 12 hours to monitor Climatic Parameters. The Input parameters included Ambient Air Temperature, Relative Humidity, Wind Speed, Intensity of Sunlight, Green-cover Area; and Public Perception which was ascertained at each observatory with the help of a self-designed compact questionnaire survey. Subsequently, this newly designed empirical relationship was employed for establishing the Thermal Comfort Index of various Public Green Spaces of Bengaluru, with ranking.

Palabras clave

  • Public Green Spaces
  • Thermal
  • Topography
  • Bengaluru
  • Comfort
Acceso abierto

Buckling Loads of Fully Embedded Pile in Clayey Soil Based on the Finite Element Method

Publicado en línea: 02 Feb 2022
Páginas: 26 - 39

Resumen

Abstract

Pile foundations are a well-established means of transferring axial loads applied by a superstructure to rigid soil layers. However, the geometrical characteristics of piles can induce the appearance of the buckling phenomenon when using this type of foundation. Furthermore, buckling is a very important factor in the design of piles, especially when the upper layers are loose or weak soil. Pile buckling is currently one of the more complicated geotechnical problems that engineers and researchers have to deal with. The aim of this work is to analyze the effects of some geometrical, mechanical or geotechnical parameters into the value of critical buckling load of an axially loaded pile totally embedded in a homogeneous soil. In this study, numerical buckling analysis is investigated by using three dimensional finite element analysis. The buckling load was studied for concrete pile. while the modulus of soil reaction is adopted constantly with depth. The Numerical results of the buckling loads of fully embedded pile that obtained by the finite element method and Davisson method are also compared in this paper.

Palabras clave

  • buckling of piles
  • soil-pile system
  • eigenvalue buckling
  • finite element analysis
Acceso abierto

A Combined-Index Study on the Influence of Earthquake Incidence Angle on the Seismic Performance of Reinforced Concrete Plan-Asymmetric Buildings

Publicado en línea: 02 Feb 2022
Páginas: 40 - 54

Resumen

Abstract

A study is performed to estimate the critical seismic incidence angle for a nine-story reinforced concrete dual system building, categorized as plan-asymmetric, by considering a combination of two demand parameters, the Maximum Inter-story Drift (MLID) along the height, and the Seismic Vulnerability Index (SVI). The influence of excitation directionality on the response of the building was investigated by nonlinear dynamic analyses, by applying seven scaled bidirectional ground motion records, oriented in eight incidence angles ranging from 0° to 315°, with a 45° increment. The scaling was made for a peak ground acceleration PGA = 0.30g, according to the elastic response spectrum specified for Bucharest by the Romanian seismic code P100-1/2013. From the results, it was found that the most unfavourable response due to a specific seismic excitation may occur at any angle of incidence, which is not necessarily 0° or 90°, and that the response depends not only on the structural configuration, but also on the excitation characteristics. In addition, the influence of the flexible edge (FE) on the structural demand in terms of SVI was studied. The maximum values for SVI were obtained for the most critical angle of incidence, which is the one that has the higher MLID values in the FE for all accelerograms.

Palabras clave

  • plan-asymmetric building
  • critical incidence angle
  • maximum inter-story drift
  • seismic vulnerability index
Acceso abierto

Kinetics and Chemistry of Nitrification Process – A Review

Publicado en línea: 02 Feb 2022
Páginas: 55 - 65

Resumen

Abstract

Nitrogen is an important nutrient for the survival of all living organisms, as its chemical binding properties allow to create structures from which proteins are built. In nature, nitrogen is found in many forms and its transformation from one form to another is described by the nitrogen cycle. Ammonium is a form of nitrogen that has no direct effects on human health, but its presence in water supply systems may determine bacterial growth in the distribution networks and ultimately can generate degradation of the water quality. Its concentrations in wastewater and water intended for human consumption can be reduced by the biological process of nitrification. The purpose of this paper is to review the equations and the kinetics of the biological nitrification process.

Palabras clave

  • biological process
  • growth rate
  • stoichiometric equations
  • kinetics

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