Critical resource supply chains are vulnerable to manipulation because of the un-substitutability of their goods. When a monopoly controls all or part of a market, it has the ability to profit from a reduction in supply of a critical resource. We model this complex adaptive system (CAS) using an agent-based model (ABM) and investigate a strategy to mitigate the potential for exploitation of a m...

The demands for fresh process waters and heating/cooling utilities arise intermittently in batch plants. Due to equipment constraints, the quality and flow-rate of each resulting wastewater stream are required to be controlled within specified limits before treatment/regeneration. In this paper, a general mathematical programming model is developed to design the optimal buffer system for equali...

A simple, accurate and sensitive spectroscopic method has been proposed for the assay of ciprofloxacin in tablet by least square treatment of fourier transform infrared spectrometric data obtained at the wavenumber corresponding to the carbonyl group centered at 1707 cm(-1). The method involves the extraction of the active ingredient with methanol followed by phosphate buffer pH 6.0. The excipi...

The major components of the plant curcuma longa are the curcuminoids that include curcumin, demethoxycurcumin and bisdemethoxycurcumin. It has been reported the curcuminoids have some important activities. A new CZE method with diode array detection has been developed for the separation and determination of the curcumin, demethoxycurcumin and bisdemethoxycurcumin. Three curcuminoids could be re...

The rapidly increasing power demand, downsizing of electronics and material specific limitation silicon has led to development AlGaN/GaN heterostructures. Commercial GaN devices are best available for radio frequency (RF) high voltage switching applications. Emerging AlxGa1-xN channel based heterostructures promising enhance the limits next generation devices. In this work, we report on study e...

A method was developed for the separation of CdII, PbII, PtII, CoII, NiII, BiIII, CrII, CuII and HgII bis(2-hydroxyethyl)dithiocarbamate (HEDTC) complexes by micellar electrokinetic capillary chromatography. The complexes were formed by pre-capillary reaction of the metal ions with an excess of the ligand and then separated using a 100 mm borate buffer (pH 9.2) containing 4% methanol (v/v), 10 ...

A dialysis method for determining “free” thyroxine in diluted serum is presented. The effect of a number of variables (pH, incubation time and temperature, buffer composition and concentration, protein concentration, and specimen dilution) was studied, and pertinent data are presented. Withinrun precision (95% confidence limits) was ±10.6%; between-run precision was ±14.2%. Specimens from 84 he...

We compare two methods of acquiring ultrasound tongue images. A new system capable of recording directly from the cineloop image buffer at a high frame rate and which is more accurately synchronized with audio is compared with an optimised method of recording images via the NTSC video output of an ultrasound machine. As a focus for this comparison we gathered representative data on English /l f...

A simple, sensitive and highly selective electrochemical method was developed for the simultaneous determination of nitazoxanide and ofloxacin in aqueous media (Britton-Robinson buffer, pH-8.36) on a hanging mercury drop electrode (HMDE) using differential pulse polarography (DPP). Using DPP a separation of about 936 mV between the peak oxidation potentials of nitazoxanide and ofloxacin present...

Purpose: A new sensitive sensor was fabricated for the determination of ivabradine hydrochloride (IH) based on modification with multiwalled carbon nanotubes using sodium dodecyl sulfate as micellar medium to increase the sensitivity. Methods: The electrochemical behavior of IH was studied in Britton-Robinson buffer (pH: 2.0-11.0) using cyclic and differential pulse voltammetry. Results: The vo...