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Showing 1 to 20 of 69 for “"Concentration Measurements"”.
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Equilibrium vacancy concentration measurements in solid argon
… expansion to determine equilibrium vacancy concentrations, has been applied to solid argon. The results indicate that vacancy concentrations do not exceed 0.02% even at the highest temperatures. Although the data obtained were not sufficiently precise to allow unique values to be determined …
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Spatiotemporal Temperature and Concentration Measurements in a Monolith Reactor
… comprehensive information about the thermal and concentration fields inside the monolith reactor. The concentration fields can be studied by a Spatially Resolved Capillary Inlet Mass Spectrometer technique (Spaci-MS). On the other hand, the temperature field is often measured by positioning …
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Mobosens: Mobile software platform for concentration measurements on a smartphone
… over laboratory solutions for quantitative measurements of chemical concentrations in water. First, the cost of a mobile device is more affordable than professional measuring equipment; second, a mobile device is very portable and convenient for performing measuring tasks at multiple …
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Equilibrium vacancy concentration measurements and thermal properties of solid krypton
… length and x-ray lattice parameter expansion measurements have been made on three 6 mm diam cylindrical specimens of 99.995% purity krypton. The specimens were prepared and held unconstrained in a rigid-tail cryostat in which specimen temperatures could be precisely controlled. The data show a …
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A Sampling Probe for Fluctuating Concentration Measurements in Supersonic Flow
… have a poor frequency response, and that makes measurements of fluctuating concentration problematic. The goal of this study is to design, build and test a probe capable of measuring concentration fluctuations of at least 1 kHz. This study shows the design of such a probe and how a high …
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Method Development For Concentration Measurements of SVOCs and Analysis of Ambient Samples
… analytical technique for accurate concentration measurement of the selected classes of SVOCs is essential in order to gain more insight into their ambient yield and environmental fate. Recently, a new methodology that allows sampling and analysis of the total (gas phase and PM) …
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Rotating Disk Electrode Design for Concentration Measurements in Flowing Molten Chloride Salts
… as it moves through the process. Electrochemical concentration measurements are straightforward and well understood in static cases when there is only a single element to consider. When additional elements are added, or the system is flowing rather than static, things get slightly more complicated …
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Analyzing decomposition of diisopropyl methylphosphonate (DIMP) in high-explosive detonations using absorption spectropscopy and gas concentration measurements
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Effects of Downwash when Measuring Gas Concentration with UAV-Mounted Gas Sensors
… cause significant changes in density-based gas concentration measurements. US regulations evaluate gas concentration as a function of gas density, and accurate concentration measurements are critical for protecting health and safety, which means evaluation of actual downwash effects on measured …
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Performance Evaluation of Material Decomposition Using Rapid Kvp-Switching Dual-Energy Ct For Assessing Bone Mineral Density
… the rapid kVp-switching GE HD750 scanner, the concentrations of various solutes were assessed in two-material syringe-phantoms in different experimental conditions with DECT material density images, SECT and DXA. RMS error was used to evaluate the accuracy of the DECT concentration measurements …
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Fluctuating concentrations in atmospheric dispersion
… results of average and instantaneous concentration measurements from a series of atmospheric dispersion experiments conducted under both unstable and stable meteorological conditions. The experiments were undertaken at two different sites, over both flat and gently rolling terrain. Two …
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NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations
… addresses the feasibility of using dissolved concentration measurements to estimate the spatial distribution of an immobile (or residual) NAPL mixture in a saturated field-scale system. We first developed a state estimation algorithm for a one-dimensional point source problem. (Bennett 1992, …
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Thermal Diffusion and Flame Structure in a Laminar Hydrogen Jet Diffusion Flames
… of the stabilization region, temperature and concentration measurements indicated that jet flame attachment is sensitive to nozzle and flow conditions. The complex interactions of flow, flame stretch, and chemistry were found to be important in the driven vortex-flame interactions.
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Parameter estimation and optimal experimental design in flow reactors
… of the kinetic of the reactions using measurements of observable quantities. We present the case of a real experiment in which the reaction rate is estimated by means of concentration measurements. We introduce methods for the optimal experimental design of experiments in the context of …
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Oro taršos tyrimas Kuršėnų mieste rugsėjo- gruodžio mėnesiais /
… An observation program was designed and particle concentration measurements in Kuršėnai city through September to December were performed. Problematic territory and the reasons of particle pollution are identified. Conclusions and recommendations on how to improve the situation are provided. A …
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Groundwater transport of Escherichia coli bacteria to open surface waters on Virginia's Coastal Plain: a GIS approach
… analysis was performed on fecal coliform concentration measurements taken from 1981 through 1992 in the Chesapeake Bay region. In all, over 191,000 bacteria concentration measurements in the main database were considered. An analysis of various hydrological factors was made to determine …
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A novel trimodal sensor for eddy correlation measurements of benthic flux in aquatic environments
… simultaneous, and co-located velocity and concentration measurements. It has been successfully used in a range of settings to determine benthic fluxes of dissolved oxygen, using an Acoustic Doppler Velocimeter (ADV) to measure water velocity and an oxygen microelectrode to measure …
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Investigation of Degenerate Four -Wave Mixing and Polarization Spectroscopy for Quantitative Measurements in Combustion Environments
The application of DFWM and PS for quantitative concentration measurements was investigated experimentally by measuring lineshapes and signal intensities in well-characterized hydrogen/air flames. Resonances in the A2Sigma +-X2pi (0,0) band of hydroxyl (OH) were probed with both perturbative and …
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Developing an elevated temperature Pourbaix diagram for zirconium and multi-element Pourbaix diagram of Zircaloy-4
… of information is addressed through solubility measurements and the development of elevated temperature Pourbaix (E-pH) diagrams for zirconium and Zircaloy-4. These Pourbaix diagrams of zirconium and multi-element diagram (Sn, Zr, Cr) of Zircaloy-4 were developed at 373.15K (100 °C). Solubility …
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Quenching and annealing of lattice vacancies in pure lead
… vacancy clusters and vacancy loops. Slope change measurements made at 140 K and 150 K indicate a divacancy migration energy of 0.45±0.04 eVe Anneals at 269 K and 322 K indicate a strong influence from impurities. A divacancy binding energy of 0.23+0.03eV is found. Good agreement with defect …
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