supercritical fluid treatment of nuclear wastes

DSpace at VNU: Numerical treatment of nonconservative terms in resonant regime for fluid flows in a nozzle with variable cross-section

... Numerical treatment Well-balanced scheme Fluid dynamics Nozzle Hyperbolic conservation law Source term Shock wave Stationary wave Introduction We are interested in the numerical treatment of the ... method after cooperating one of the above-mentioned two computing correctors provides us with good approximations of the exact solutions of (1.1) for data on both side of the resonance surface Moreover, ... The organization of this paper is as follows In Section we provides basic properties of the model (1.1) Section is devoted to equilibrium states, where characterization of roots of the nonlinear

Ngày tải lên: 15/12/2017, 15:06

10 195 0

Chiral and achiral separation of ten flavanones using supercritical fluid chromatography. Application to bee pollen analysis

... products these compounds often occur in the presence of each other, methods enabling the chiral separation of more than one flavanone are of great interest Although the determination of flavanones has ... extraction of flavanones was performed according to a previous published methodology [35] Briefly, g of sample was mixed with 25 mL of ethyl acetate; then 12.5 mL of 40% ammonium sulphate and 2.50 mL of ... sample treatment 2.4 Method performance Performance of the chiral chromatographic method was evaluated in terms of repeatability, intermediate precision, accuracy, limit of detection (LOD), limit of

Ngày tải lên: 20/12/2022, 21:25

12 1 0

Supercritical fluid chromatography as a rapid single-step method for the determination of mineral oil saturated and aromatic hydrocarbons in purified mineral oils for food and

... Journal of Chromatography A 1614 (2020) 460713 Contents lists available at ScienceDirect Journal of Chromatography A journal homepage: www.elsevier.com/locate/chroma Supercritical ﬂuid ... needed since baseline separation of the two fractions could not be obtained Validation of the method performance showed an excellent linearity (R2 > 0.9995) in the range of concentrations tested (2.5–100 ... c t Mineral oil hydrocarbons are used in the consumer goods sector for the elaboration of a wide range of foods and cosmetics Traditional methods for determining their levels and composition

Ngày tải lên: 25/12/2022, 00:48

11 10 0

Applicability of Supercritical fluid chromatography–Mass spectrometry to metabolomics. II–Assessment of a comprehensive library of metabolites and evaluation of biological

... the field of metabolomics For this purpose, a representative set of 49 metabolites were selected The assessment of the matrix effects (ME), the impact of biological fluids on the quality of MS/MS ... precipitation of the metabolites might happen due to the incompatibility of such substances with the UHPSFC mobile phase, especially at the beginning of the gradient profile where a high proportion of supercritical ... was the main source of ME for urine, while in plasma the presence of a more complex profile of endogenous compounds translates into the presence of both ion suppression (10% of metabolites) and,

Ngày tải lên: 25/12/2022, 00:49

10 8 0

Systematic investigations of peak distortions due to additives in supercritical fluid chromatography

... 2-μL samples of DEA or TEA or 5-μL samples of iPrNH2 were injected The retention times of the additives were estimated using the ﬁrst statistical moment due to the severe degree of peak tailing ... Journal of Chromatography A 1621 (2020) 461048 Fig Adsorption isotherms of propranolol at different eluent compositions (a) Constant MeoH fraction of 16% (v/v) and varying DEA contents of 0.021, ... approach often used to increase the productivity of preparative separation In this approach, the next injection is made before the complete elution of the current cycle The cycle time of an injection

Ngày tải lên: 25/12/2022, 00:51

12 0 0

Predictions of overloaded concentration profiles in supercritical fluid chromatography

... rate of 0.5 mL min–1 , (ii) a set outlet pressure of 110 bar and a flow rate of 2.5 mL min–1 , and (iii) a set outlet pressure of 150 bar and a flow rate of 1.5 mL min–1 Also, the true value of ... isotherm model was a function of the temperature and density of the mobile phase Thus, the influences of mobile phase properties on retention and of the movement of the elution profiles due to ... outlet pressures of (a) 90 and (b) 150 bar, respectively The thermal expansion of the mobile phase results in the increase of the mobile phase velocity and thus the increase of the concentration

Ngày tải lên: 25/12/2022, 02:00

11 3 0

Expanding the range of sub/supercritical fluid chromatography: Advantageous use of methanesulfonic acid in water-rich modifiers for peptide analysis

... School of Pharmaceutical Sciences, University of Geneva, CMU – Rue Michel-Servet 1, 1211 Geneva 4, Switzerland Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, ... applicability for the analysis of peptides The aim of this study was to evaluate the performance of UHPSFC, coupled to different detectors (UV and MS), for the analysis of a series of synthetic and therapeutic ... employment of acidic additives, such as TFA Using the same strategy, an evaluation of the mobile phase acidity, with mM MSA and mM TFA, was carried out (Fig 4), using 50% of supercritical CO2 and 50% of

Ngày tải lên: 25/12/2022, 02:02

12 7 0

Ultrahigh-performance supercritical fluid chromatography – mass spectrometry for the qualitative analysis of metabolites covering a large polarity range

... urine using UHPSFC/QTOF-MS with the evaluation of the impact of the biological matrix Most of selected compounds were not affected by matrix interference (63%), whereby 16% of compounds showed ... precipitation, μL of Proteinase K and μL of 250 mM CaCl2 were added to 100 μL of plasma sample to obtain a final concentration of mM and sonicated for 15 at 40 °C For protein precipitation, mL of CH3 OH/EtOH ... solvation of polar analytes As a consequence of the limited maximum upper pressure of the UHPSFC system, it was not possible to maintain high flow rates and reach 100% of the modifier for the elution of

Ngày tải lên: 25/12/2022, 02:51

12 3 0

Supercritical fluid chromatography-mass spectrometric determination of chiral fungicides in viticulture-related samples

... limitations of chiral LC-based methods are either the use of isocratic conditions, often optimized for the separation of the enantiomers of single compound [15, 18, 19], or, in case of multianalyte ... Major advantages of the latter technique are reduction of the analysis time, due to the higher diffusivity and lower viscosity of supercritical CO2 , and save of large volumes of toxic organic ... 6.05-10 (2% B) The identity of the enantiomers of these fungicides was conﬁrmed by injection of R-forms of MET and BEN, as well as R and S isomers of TEB Chiral separations of MYC and PEN were performed

Ngày tải lên: 31/12/2022, 09:38

10 7 0

Báo cáo y học: " Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial"

... Department of Statistics, University of Connecticut, Storrs, CT, USA 5. Department of Medicine, Division of Rheumatology, Allergy and Immunology, School of Medicine, University of California ... the safety and efficacy of UC-II as compared to a combination of glucosamine and chondroitin (G+C) in the treatment of OA of the knee. The results indicate that UC-II treatment was more efficacious ... to the dosing schedule less than 75% of the time. Method of assigning patients to treatment groups Patients were assigned to treatment groups (or-der of treatments) using computer-generated

Ngày tải lên: 26/10/2012, 09:48

10 706 0

Misoprostol for treatment of incomplete abortion

... acceptability of misoprostol for treatment of incomplete abortion, while Chapters III through V outline who can be offered the method, recommended regimens, schedule of clinic visits, management of side ... with misoprostol treatment than MVA treatment. 13, 16, 18 Refer to Table 2 for a comparison of methods of management of incomplete abortion.Trang 12G Misoprostol is an important new treatment for ... treatment of incomplete abortion in the first trimester is independent of gestational age at the time of miscarriage/abortion.26Table 3: Recommended regimens of misoprostol for treatment of incomplete

Ngày tải lên: 17/11/2012, 09:13

52 302 0

Treatment of semi-aerobic landfill leachate using durian peel-based activated carbon adsorption- Optimization of preparation conditions

... surface plot of COD removal of DPAC (effect of temperature and time, flow rate = 100 ml/s) Table Analysis of variance (ANOVA) for response surface quadratic model for color removal of DP activate ... release of gaseous products such as CO2, CO and H2 The removal of colour was also dependent by kinetic rate of adsorption which was found to be influenced not just by ﬁlm diffusion and by the rate of ... Table Analysis of variance (ANOVA) for response surface quadratic model for COD removal of DP activated carbon Source Model x1 x2 x3 x12 x22 x32 x1x2 x1x3 x2x3 Residual Lack of fit Sum of squares

Ngày tải lên: 05/09/2013, 16:10

14 612 0

Treatment of Pharmaceutical Wastes doc

... treatment should be utilized in order to increase the level of treatment 5.6.2 Biological Treatment The biological treatment of pharmaceutical wastewater includes both aerobic and anaerobic treatment ... levels of aliphatic solvents It has been reported that of the 1000 tons per year of EC-deﬁned toxic wastes generated in Ireland, organic solvents contribute 66% of the waste [27] A survey of the ... and treatment systems Municipal waste treatment The treatment options cited above are very speciﬁc to the type of waste To have a clear understanding of the various unit operations used in the treatment...

Ngày tải lên: 22/03/2014, 14:20

67 663 1

Phsicochemical Treatment of Hazardous Wastes - Chapter 2 potx

... Physicochemical Treatment of Hazardous Wastes radiation hazards, unprecedented volumes of contaminated soil and water, and a large number of contaminated structures, ranging from nuclear reactors ... combustion, formation of more toxic products in the ash, and emission of hazardous air pollutants Typical sources of contamination from the contaminated sites of the Department of Defense (DOD) are ... 11, 2003 11:34 AM 32 Physicochemical Treatment of Hazardous Wastes GASEOUS PV K KÓ SOLID NAPL KÕ KH S AQUEOUS FIGURE 2.4 Schematic of contamination phases of NAPL in soil 2.4.1 Groundwater Groundwater...