When petroleum hydrocarbon pollutants enter the ocean, besides migration under hydrodynamic constraints, their degradation due to environmental conditions also occurs. However, available observations are usually spatiotemporally disperse, which makes it difficult study characteristics of pollutants. In this paper, a model transport and is used estimate coefficient with adjoint method. Firstly, ...

This paper describes optimizing a cost function for segment selection in concatenative Text-to-Speech based on perceptual characteristics. We use the norm of a local cost for each segment as an integrated cost function for a segment sequence to consider both the degradation of naturalness over the entire synthetic speech and the local degradation. The cost function is optimized by adjusting not...

Propargyl bromide is being investigated for its potential as a soil fumigant. Characterization of the fate of propargyl bromide in soil is important in determining both efficacy and the threat of environmental contamination. These experiments investigated some of the factors affecting the rate of propargyl bromide degradation in soil and quantified some of the products formed as a result of pro...

Dye-containing wastewater generated from textile industries is a major source of environmental pollution. Azo dyes, which are the largest group of coloring agents, are widely used in industries.This research investigated the photocatalytic decolorization and degradation of an azo dye Reactive Red 198 (RR198) in aqueous solution with TiO2-P25 (Degussa) as photocatalyst in slurry form using UV li...

Sanjiang Plain has undergone dramatic land degradation since the 1950s, which has caused negative effects on ecosystems services and sustainability. In this study, we used trajectory analysis as well as the Lorenz curve, Gini coefficient and relative land use suitability index (R) to analyze spatiotemporal changes of land degradation from 1954 to 2013 and to make a preliminary estimation of the...

This study investigates the effect of temperature on the ultrasonic degradation of polyvinyl acetate and polyvinyl chloride in chlorobenzene. The time evolution of molecular weight distribution was determined using gel permeation chromatography. Continuous distribution kinetics was used to obtain the degradation rate coefficients. The rate coefficients decrease with increasing temperature, and ...

A simple, selective, precise and stability-indicating high-performance thin-layer chromatographic method of analysis of Clozapine in pharmaceutical dosage form was developed and validated. The method employed TLC aluminium plates precoated with silica gel 60F-254 as the stationary phase. The solvent system comprised of toluene methanol ethyl acetate ammonia (8:2:1:0.1, v/v/v/v). This system was...

the present study was carried out to determine the nutritive value of white varieties of grape pomace (gp) and raisin vitis leaves (rvl), using nylon bags and gas production techniques. tow fistulated whether with average body weight of 45±2 kg were used. the amount of gas produced was measured at 2, 4, 6, 8, 12, 16, 24, 36, 48 and 72 h times and degradation was measured using nylon bags up to ...

abstract in order to study the effects of soil texture and temperature on atrazine degradation, an experiment was conducted in completely randomized design with factorial arrangement and 3 replications. experimental factors included, soil texture (sandy loam and silty clay), temperature(10, 20 and 30 oc) and 4 incubation periods(0, 20, 40 and 60 days). soil was spiked with atrazine at a rate of...