نتایج جستجو برای: btcs
تعداد نتایج: 136 فیلتر نتایج به سال:
In this study we measured the total concentration of BTCs using grab water sampling, dissolved with passive samplers, and particle-bound fraction sedimentation traps in a Finnish inland lake. The sampling was conducted from May to September over two years. samples average MBT at sites varied between 4.8 13 ng L −1 , DBT 0.9–2.4 TBT 0.4–0.8 during first year 0.6–1.1 0.5–2.2 < LOD-0.7 seco...
Abstract Soils and other geologic porous media often have contrasting grain size layers associated with a transition zone between layers. However, this is generally simplified to plane of zero thickness for modeling assumption, its influence has always been neglected in previous studies. In study, an approach combining deposition process random packing was developed generate 3D without consider...
Biochar land application can potentially be used for carbon sequestration, improving soil quality, and reducing non-point source pollution. Understanding biochar mobility is important because its transport in soil greatly influences its stability, the dynamics of soil microbial communities and organic matter, and the movement of biochar-associated contaminants. Here, the transport of biochar pa...
More ecient methods are needed for the in situ evaluation of solute sorption to aquifer sediments. The objective of this study was to develop a simpli®ed method for estimating retardation factors for injected solutes from ``push±pull'' test extraction phase breakthrough curves (BTCs). Sensitivity analyses based on numerical simulations were used to evaluate the method performance for a variety...
Noble gases have attributes and properties that make them very attractive as tracers for fluid movement and reservoir processes. Noble gases are non-reactive and most of them have no sinks or sources in the subsurface, rendering them conservative. They occur naturally in waters that have been in contact with the atmosphere in concentrations that depend on their solubilities. As solubilities are...
The impact of pH and ionic strength on the mobility (individual and co-transport) and deposition kinetics of TiO2 and ZnO NPs in porous media was systematically investigated in this study. Packed column experiments were performed over a series of environmentally relevant ionic strengths with both NaCl (0.1-10 mM) and CaCl2 (0.01-0.1mM) solutions and at pH 5, 7, and 9. The transport of TiO2 NPs ...
1 Facultatea de Electronică şi Telecomunicaţii, Departamentul Comunicaţii, Bd. V. Pârvan Nr. 2, 300223 Timişoara, e-mail [email protected], [email protected], [email protected] 2 Department of Electrical and Computer Eingineering, Rice University, MS-366 – 6100 Main Street, Huston, Texas 77005, e-mail [email protected] Universitatea Politehnica din Bucuresti, Facultatea de Elec...
The prognosis of patients with unresectable and recurrent biliary tract cancer (BTC) is very poor. Although gemcitabine (GEM) plus cisplatin therapy is useful for unresectable cases, the median overall survival (OS) of the patients is <1 year, and third-line chemotherapy following failure of 5-fluorouracil (5-FU) and GEM plus cisplatin is currently unavailable. The clinical efficacy and basic e...
Transport of dissolved organic matter (DOM) from the Suwannee River and of synthetic polystyrene sulfonates (PSSs) was investigated in columns packed with naturally Fe/Al-oxide-coated sands from Oyster, Virginia. Surface-water samples were collected in May 2012 and processed by XAD-8 (humic substances; HPOA), XAD-4 (transphilic acids [TPIAs]), and reverse osmosis (broad range of components; NOM...
Bitcoin is gaining increasing adoption and popularity nowadays. In spite of its reliance on pseudonyms, Bitcoin raises a number of privacy concerns due to the fact that all of the transactions that take place in the system are publicly announced. The literature contains a number of proposals that aim at evaluating and enhancing user privacy in Bitcoin. To the best of our knowledge, ZeroCoin (ZC...
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