a simple, accurate and rapid high performance thin layer chromatography (hptlc)-densitometric method was developed for separation and determination of cetirizine (cet) as a long acting antihistamine and montelukast (mon) as an antileukotriene in pharmaceutical dosage forms. the compounds were separated on silica gel 60 f254 hptlc plates using a mixture of ethyl acetate : methanol : ammonia solu...

Introduction: Designing RF pulses in parallel excitation (PTX) using the linear small-tip-angle approximation [1-3] produces distorted excitation patterns at large tip angles due to the nonlinear nature of the Bloch equation. Grissom et al [4] proposed the ‘Additive Angle’ (AA) method for large-tip-angle RF pulse as a means to improve upon the small-tip-angle approximation (STA). This iterative...

We present an analysis of a devised sample of Rotation Curves (RCs), aimed at checking the consequences of a modified f(R) gravity in galactic scales. Originally motivated by the the dark energy mystery, this theory may serve as a possibility of explaining the observed non-Keplerian profiles of galactic RCs in terms of a breakdown of the Einstein General Relativity. We show that in general the ...

Several techniques have been proposed for estimating and compensating for the effects of quadrature modulators and demodulators. Several of them will be discussed in this survey including those that observe the envelope of signals, the pilot tones of OFDM signals, and others.

In this paper, we carefully re-examine the chaotic RF model, first studied by Rabinovich & Fabrikant [1979], and found many new and rich complex dynamics of the model that were mostly not reported before. The chaotic RF model has proved to be a great challenge to classical numerical methods, in the sense that most classical numerical methods have not been very successful in studying the complex...

We present a novel method to recognise semantic equivalents of biomedical terms in language pairs. We hypothesise that biomedical term are formed by semantically similar textual units across languages. Based on this hypothesis, we employ a Random Forest (RF) classifier that is able to automatically mine higher order associations between textual units of the source and target language when train...

background: induction of cellular response after exposure to electromagnetic fields is limited to coherent fields. an incoherent noise field is supposed to suppress the bioeffects of regular rf electromagnetic fields. the purpose of this study was to investigate the effect of gsm mobile phone-induced radiofrequency (rf) on the induction of oxidative stress in sp2/0 cell line. materials and meth...

To distinguish the real pre-miRNAs from other hairpin sequences with similar stem-loops (pseudo pre-miRNAs), a hybrid feature which consists of local contiguous structure-sequence composition, minimum of free energy (MFE) of the secondary structure and P-value of randomization test is used. Besides, a novel machine-learning algorithm, random forest (RF), is introduced. The results suggest that ...

Radio-frequency (RF) circuits exhibit several distinguishing characteristics that make them difficult to simulate using traditional SPICE transient analysis. The various extensions to the harmonic balance and shooting method simulation algorithms are able to exploit these characteristics to provide rapid and accurate simulation for these circuits. This paper is an introduction to RF simulation ...