The Experts below are selected from a list of 570 Experts worldwide ranked by ideXlab platform
Raven W.j. - One of the best experts on this subject based on the ideXlab platform.
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Nieuwe blik op kip en knik - stabiliteit en sterkte van staven
2006Co-Authors: Raven W.j.Abstract:New vision on flexural-torsional buckling Stability and strength of structural members Summary This thesis presents insight into the stability check of beam-columns loaded in compression and bending in a number of clearly distinct steps. Of decisive importance is the newly introduced symbol n* that is defined as: n* is the ratio of total deformation and 2snd order part of deformation Very important is the 'alerting function' that this symbol can fulfil when judging the stability of beamcolumns. In an iteration procedure a general formula is presented, in which all necessary data concerning bar properties and load case are covered. The safety is evaluated by checking if the requirements are met with help of a unity check. Also is described how to calculate the displacement. New result of this thesis is that a unified methodology for flexural-torsional buckling is applicable for all existing construction materials in structural engineering. Essentially the calculations can be done in a short time using a Pocket Calculator, without the use of other utilities. It has been deliberately chosen not to elaborate the derived formulas too far, in order to preserve a clear view on the cohesion and procedure
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Nieuwe blik op kip en knik - stabiliteit en sterkte van staven
2006Co-Authors: Raven W.j.Abstract:New vision on flexural-torsional buckling Stability and strength of structural members Summary This thesis presents insight into the stability check of beam-columns loaded in compression and bending in a number of clearly distinct steps. Of decisive importance is the newly introduced symbol n* that is defined as: n* is the ratio of total deformation and 2snd order part of deformation Very important is the 'alerting function' that this symbol can fulfil when judging the stability of beamcolumns. In an iteration procedure a general formula is presented, in which all necessary data concerning bar properties and load case are covered. The safety is evaluated by checking if the requirements are met with help of a unity check. Also is described how to calculate the displacement. New result of this thesis is that a unified methodology for flexural-torsional buckling is applicable for all existing construction materials in structural engineering. Essentially the calculations can be done in a short time using a Pocket Calculator, without the use of other utilities. It has been deliberately chosen not to elaborate the derived formulas too far, in order to preserve a clear view on the cohesion and procedure.Civil Engineering and Geoscience
M A Kassem - One of the best experts on this subject based on the ideXlab platform.
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independent models for estimation of daily global solar radiation a review and a case study
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Muhammed A Hassan, A Khalil, S Kaseb, M A KassemAbstract:Abstract Independent models are models that estimate daily horizontal global solar radiation without need for prior records of any solar or meteorological parameters such as sunshine duration, cloud cover or temperature. These models are based on the day number, which means that they are very simple, enabling the user to estimate global radiation using only a Pocket Calculator. Though, they are relatively newer and much fewer as compared to other dependent models such as sunshine-based models. In this study, a first comprehensive review of all such models is provided. Besides, daily radiation data integrated from highly accurate minutely irradiance data measured at Cairo (Egypt) is used to recalibrate and compare independent models statistically. All models are trained and cross-validated using a detailed novel approach. The results show that, despite their simplicity, independent models have very good estimations of solar irradiation with coefficients of determination no less than 82%.
Socrates Kaplanis - One of the best experts on this subject based on the ideXlab platform.
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new methodologies to estimate the hourly global solar radiation comparisons with existing models
Renewable Energy, 2006Co-Authors: Socrates KaplanisAbstract:Abstract This paper describes two new friendly and reliable approaches to estimate hourly global solar radiation on a horizontal surface even with a Pocket Calculator. Such fast and reliable predictions for the hourly solar radiation are necessary for the real-time management of both the solar energy sources, like a PV generator output in the one hand and the power loads, on the other. The predicted global solar hourly radiation values are compared with estimates from two existing packages and the recorded solar radiation for the two biggest cities of Greece. The two methodologies presented in this paper can be applied to any other site.
Muhammed A Hassan - One of the best experts on this subject based on the ideXlab platform.
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independent models for estimation of daily global solar radiation a review and a case study
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Muhammed A Hassan, A Khalil, S Kaseb, M A KassemAbstract:Abstract Independent models are models that estimate daily horizontal global solar radiation without need for prior records of any solar or meteorological parameters such as sunshine duration, cloud cover or temperature. These models are based on the day number, which means that they are very simple, enabling the user to estimate global radiation using only a Pocket Calculator. Though, they are relatively newer and much fewer as compared to other dependent models such as sunshine-based models. In this study, a first comprehensive review of all such models is provided. Besides, daily radiation data integrated from highly accurate minutely irradiance data measured at Cairo (Egypt) is used to recalibrate and compare independent models statistically. All models are trained and cross-validated using a detailed novel approach. The results show that, despite their simplicity, independent models have very good estimations of solar irradiation with coefficients of determination no less than 82%.
A Khalil - One of the best experts on this subject based on the ideXlab platform.
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independent models for estimation of daily global solar radiation a review and a case study
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Muhammed A Hassan, A Khalil, S Kaseb, M A KassemAbstract:Abstract Independent models are models that estimate daily horizontal global solar radiation without need for prior records of any solar or meteorological parameters such as sunshine duration, cloud cover or temperature. These models are based on the day number, which means that they are very simple, enabling the user to estimate global radiation using only a Pocket Calculator. Though, they are relatively newer and much fewer as compared to other dependent models such as sunshine-based models. In this study, a first comprehensive review of all such models is provided. Besides, daily radiation data integrated from highly accurate minutely irradiance data measured at Cairo (Egypt) is used to recalibrate and compare independent models statistically. All models are trained and cross-validated using a detailed novel approach. The results show that, despite their simplicity, independent models have very good estimations of solar irradiation with coefficients of determination no less than 82%.