a simple, accurate and precise hptlc- densitometry method for the simultaneousdetermination of abacavir, lamivudine and zidovudine in pharmaceutical tablet has beendeveloped. separation of tablet components was performed on aluminum backed hptlc plates(silica gel 60 f254 20×20 cm with 0.2 mm thickness, camag, muttenz, switzerland ) usingmethanol : chloroform : acetonitrile (4 : 8 : 3 v/v). good...

In some statistical process control applications, the quality of the product is characterized by thecombination of both correlated variable and attributes quality characteristics. In this paper, we propose anovel control scheme based on the combination of two multi-layer perceptron neural networks forsimultaneous monitoring of mean vector as well as the covariance matrix in multivariate-attribu...

Background and objectives:  High concentration of preservatives in food may result in gastrointestinal disturbances whereby some patients suffering from asthma, rhinitis, or urticaria. The aim of this study is the introduction and optimization a new method for simultaneous determination of four preservatives (SB, PS, MP, PP) in foodstuff by high performance liquid chromatography. Materi...

To date, experimental comparisons of menu layouts have concentrated on variants of hierarchical structures of sequentially presented menus. Simultaneous menus—layouts that present multiple active menus on a screen at the same time—are an alternative arrangement that may be useful in many Web design situations. This article describes an experiment involving a between-subject comparison of simult...

Previous research has shown that under certain rather explicit conditions it is possible to facilitate performance on a vigilance task by performing another vigilance task simultaneously. The question arises as to whether or not performance on at; auditory vigilance task is facilitated by simultaneously performing a continuous tracking task. It was concluded from the study reported here that in...

Ten right-handed patients with Parkinson's disease and 9 normal subjects performed five different types of movements as rapidly as possible in their own time: isotonic elbow flexion through an angle of 15 deg ('flex'); isometric squeezing of a force transducer between thumb and fingers ('squeeze'); isotonic finger flexion ('cut'); simultaneous performance of both 'flex' and 'squeeze'; simultane...

Decades of Electroencephalogram-NeuroFeedback (EEG-NF) practice have proven that people can be effectively trained to selectively regulate their brain activity, thus potentially improving performance. A common protocol of EEG-NF training aims to guide people via a closedloop operation shifting from high-amplitude of alpha (8-14Hz) to highamplitude of theta (4-7 Hz) oscillations resulting in gre...