a simple and sensitive extractive- spectrophotometric method for thedeterrnination of trace amounts of vanadium(v) is reported. the method is based on the quantitative extraction of the anion complex of v(v) with 4-(2-pyridy1azo)-resorcinol with tetrabutylammonium perchlorate into chloroform, followed by spectrophotometric measurements at 554 nm. beer's law is obeyed over the concentration...

Philippe Calain discusses the health and environmental hazards of extractive industries like mining and explores the tensions that arise when medical humanitarian organizations are called to intervene in emergencies involving the extractive sector.

Abstract The fine chemical and pharmaceutical industries use large amounts of various organic solvents in their manufacturing processes. By reusing them, production costs can be significantly reduced. If we regenerate waste solvent mixtures, have the opportunity to reuse them process or other Our study illustrates an efficient regeneration using example a four-component mixture. Calculations we...

tidepressants, a group of drugs widely used for treating depressive diseases. Its chemical structure is shown in Fig. 1. Most existing methods for the determination of nortriptyline in bulk, pharmaceutical formulations and biological samples have been reviewed. Among other methods described for the assay of this drug are direct UV-spectrophotometry, derivatives spectrophotometry, fluorimetry an...

Dense vector representations of words, and more recently, sentences, have been shown to improve performance in a number of NLP tasks. We propose a method to perform unsupervised extractive and abstractive text summarization using sentence embeddings. We compare multiple variants of our systems on two datasets, show substantially improved performance over a simple baseline, and performance appro...

Document summarization deals with providing condensed version of the original document. We present an extractive informative single medical document summarization approach. We compare the tokens in the sentence with cue words. A sentence ranking method is used to extract the important sentences. The existing summarizers are used for performance analysis.