Quarterly Of Geography and Regional Planning

Qeshm Institute of Higher Education · Journal of Geography & Regional planning

The self-organizing map (SOM) neural network, also called Kohonen neural network, is an effective tool for analysis of multidimensional data. This network can be used for cluster analysis while preserving data structure (topology) in such a way that similar inputs (data) remain close together in the output layer of the network. However, no algorith...

This paper proposes a methodology for estimating a normalized power system transient stability margin (ΔVn) using multi-layered perceptron (MLP) neural network with a fast training approach. The nonlinear mapping relation between the ΔVn and operating conditions of the power system is established using the MLP neural network. The potential energy b...

This paper presents a system for recognizing static gestures of alphabets in Persian sign language (PSL) using Wavelet transform and neural networks (NN). The required images for the selected alphabets are obtained using a digital camera. The color images are cropped, resized, and converted to grayscale images. Then, the discrete wavelet transform...

This paper presents a static gesture recognition system for recognizing some selected words of Persian sign language (PSL). The required images for the selected words are obtained using a digital camera. The color images are first resized, and then converted to grayscale images. Then, the discrete wavelet transform (DWT) is applied on the selected...

This paper presents a method for solving the load-flow problem of the electric power systems using radial basis function (RBF) neural network with a fast hybrid training method. The main idea is that some operating conditions (values) are needed to solve the set of non-linear algebraic equations of load-flow by employing an iterative numerical tech...

This paper presents multi-layer perceptron (MLP) and radial basis function (RBF) neural networks (NNs) based methods for the estimation of the critical clearing time (tcr) as an index for power systems transient stability analysis (TSA). The tcr evaluation involves elaborate computations that often include time-consuming solutions of nonlinear on-f...

This paper presents a method for estimating the transient stability status of the power system using radial basis function(RBF) neural network with a fast hybrid training approach. A normalized transient energy margin() has been obtained by the potential energy boundary surface(PEBS) method along with a time-domain simulation technique, and is used...

Peroxyoxalates such as bis-(2,4,6-trichlorophenyl) oxalate (TCPO) can transfer energy to fluorescer molecules via formation of dioxetanedione intermediate. The aminoanthraquinone derivatives used in this study found to produce a red light in the chemiluminescence systems containing TCPO or lucigenin. Both the fluorescence and chemiluminescence spec...

A highly sensitive and selective fluorimetric optode membrane for the determination of ultra trace amounts of Ni2+ ions was prepared. The plasticized PVC-membrane incorporating potassium tetrakis(p-chlorophenyl)borate (KTpClPB) and 2,5-thiophenylbis(5-tert-butyl-1,3-benzexazole) (TTBB), as a highly fluorescent chromoionophore, displays a calibratio...

Solubilities of four thioxanthone derivatives in supercritical CO2 have been measured at the temperatures (308, 318, 328, 338, and 348) K in a pressure range from (122 to 355) bar. The measurements have been performed by using a simple static-sampling type apparatus. The effects of temperature, pressure, and density of carbon dioxide on solubility...

The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl) oxalate (TCPO) with hydrogen peroxide in the presence of acriflavine has been studied. The relationship between the chemiluminescence intensity and concentrations of TCPO, H2O2, acriflavine and the base sodium salicylate are reported. The kinetic parameters for the peroxy...

The equilibrium solubilities of four recently synthesized aminoanthraquinones in supercritical CO2 have been measured over a temperature range of 308 to 358 K and a pressure range of 122 to 358 bar, using a simple static method. The solubility data were correlated by a semiempirical model. The calculated results show satisfactory agreement with the...

The equilibrium solubilities of five recently synthesized anthrones have been measured in supercritical carbon dioxide using a simple and reliable static method. The measurements were performed in the pressure range (101−355) bar at the temperatures (308, 318, 328, 338, and 348) K. The measured solubilities were correlated using a semiempirical mod...

The solubilities of seven recently synthesized 1-hydroxy-9,10-anthraquinone (AQ1) derivatives in supercritical carbon dioxide have been measured using a static method. The measurements were performed over the pressure range of 12.2–35.5 MPa at 308, 318, 338 and 348 K. The solubility data have been fitted using the model proposed by Bartle. The calc...