Locating stars by approximate analytical methods for a descriptive astronomy course

1985 ◽  
Vol 53 (6) ◽  
pp. 591-591
Author(s):  
Paul Mazur
Keyword(s):  
Analytical Methods ◽  
Approximate Analytical Methods

Mathematical Modeling of Suspension Filtration on a Rapid Filter at an Unregulated Rate

2021 ◽  
pp. 78-79
Author(s):  
Vadim Poliakov
Keyword(s):  
Mathematical Modeling ◽  
Analytical Methods ◽  
Filter Medium ◽  
Flow Mode ◽  
Engineering Technique ◽  
Economic Indexes ◽  
Suspension Filtration ◽  
Approximate Analytical Methods

Mathematical modeling of detachable filtration in the split filter flow mode was carried out using exact and approximate analytical methods. An engineering technique has been developed to determine the duration of filter cycles, based on quality, economic and technical criteria. Determination of rational filter medium height was considered for two materials differed significantly by economic indexes.

scholarly journals LIMIT PERIOD BASED ON APPROXIMATE ANALYTICAL METHODS ESTIMATING INELASTIC DISPLACEMENT DEMANDS OF BUILDINGS

2007 ◽  
Vol 13 (4) ◽  
pp. 282-290 ◽  
Author(s):  
Nabil Djebbar ◽  
Nasr-Eddine Chikh
Keyword(s):  
Seismic Design ◽  
Analytical Methods ◽  
Damage Control ◽  
Design Procedure ◽  
Evaluation Procedure ◽  
Critical Study ◽  
Design Code ◽  
Performance Levels ◽  
Seismic Design Code ◽  
Approximate Analytical Methods

The Algerian seismic design code (RPA99) recommends a limit on the elastic period as a governing factor in the design process of low and mid‐rise buildings, function of the structural system regardless of the related ductility level. The recommended limit criterion is evaluated through approximate analytical methods using drift limit. The assignable displacement ductility ratio for the force reduction factor is derived from some well established R‐μ‐Tn expressions. The limit period evaluation procedure (proposed in this paper) agrees with a capacity design approach since it allows for adjusting the required resistance demand level function of a ductility level resulting from code's steel recommendations. This will enhance seismic design procedure based on a target‐period approach such as in the Algerian seismic design code RPA99, to fulfil the minimum required two performance levels or to satisfy three performance levels if a damage control is considered. A critical study is carried out considering three regular earthquake‐resistant concrete framed structures and taking into account the specificity of various types of soils, namely rock, firm and soft. A comparison of the obtained results shows clearly that the RPA99 recommended limit is only valid for nude moment resisting frames.

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