نتایج جستجو برای: napls
تعداد نتایج: 101 فیلتر نتایج به سال:
Pollutants in the form of non-aqueous phase liquids (NAPLs), such as petroleum products, pose a serious threat to the soil and groundwater. A mathematical model was derived to study the unsteady pollutant concentrations through water saturated contaminated soil under air sparging conditions for different NAPLs and soil properties. The comparison between the numerical model results and the publi...
The Ribbon NAPL Sampler (RNS) is a direct sampling device that provides detailed depth discrete mapping of Non Aqueous Phase Liquids (NAPLs) in a borehole. This characterization method provides a yes or no answer to the presence of NAPLs and is used to complement and enhance other characterization techniques. Several cone penetrometer deployment methods are in use and methods for other drilling...
An appreciation of the dissolution from entrapped nonaqueous phase liquids (NAPLs) in fractures is essential as we attempt to understand and predict the fate of NAPLs present in fractured rock systems. Eight long-term dissolution experiments using 1,1,1-trichloroethane and trichloroethylene were conducted in two laboratory-scale dolomitic limestone variable aperture fractures under various cond...
<p>This review provides a general overview of the application chemical oxidation to hydrophobic contaminants in form non-aqueous phase liquids (NAPLs). Three types processes, conventional activated persulfate, permanganate, and ozonation, along with three advanced processes (AOPs), Fenton process, photocatalysis, plasma are presented discussed. In addition, this paper brief insight into c...
Abstract Mass transfer rates at liquid–liquid interfaces are relevant for a broad range of processes in natural and technical systems. The objective this study was to characterize quantify convective flow along the interface between water nonaqueous‐phase liquids (NAPLs). Three NAPLs with different solubility were used: 1‐heptanol, 1‐octanol, 1‐nonanol. visualized recorded micromodel setup fluo...
A study was conducted to determine the effect of nonaqueous-phase liquids (NAPLs) on the bioavailability of benzo[a]pyrene (BaP) in soil. Sentry 19 oil and pristane reduced the availability of BaP for assimilation by the earthworm Eisenia fetida and for mutagenicity in a rifampicin-sensitive strain of Pseudomonas putida. As much as 80% of the compound could be rendered unavailable to the worms ...
The presence of multicomponent nonaqueous-phase liquids (NAPLs) on contaminated sites critically alters the biodegradation susceptibility of many target pollutants, including polycyclic aromatic hydrocarbons. This study investigated the effects of petroleum-derived multicomponent NAPLs on biodegradation of benzo[a]pyrene by a bacterial consortium in liquid culture. When high-boiling point diese...
This article presents the rationale, design, and preliminary findings of the North American Prodrome Longitudinal Study (NAPLS), a collaborative, multisite investigation into the earliest phase of psychotic illness. We describe how 8 independently conceived research projects were integrated methodologically, how diagnostic reliability was achieved across sites on the Structured Interview for Pr...
Multicomponent nonaqueous phase liquid (NAPL) contaminants that contain compounds that are solids in their pure states can undergo phase transformations. This paper examines the relationship between NAPL composition and liquid phase stability for mixtures of polycyclic aromatic hydrocarbons (PAHs), most of which are solids in pure form at ambient temperatures. Because any natural or engineered ...
Multi-site neuroimaging studies offer an efficient means to study brain functioning in large samples of individuals with rare conditions; however, they present new challenges given that aggregating data across sites introduces additional variability into measures of interest. Assessing the reliability of brain activation across study sites and comparing statistical methods for pooling functiona...
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