75 research outputs found
Analyses of the Nmr Spectra of the Vinyl Protons of Cyclopentadiene and Cyclohexadiene Using Spin Decoupling
Nuclear magnetic resonance spectra of vinyl protons of cyclopentadiene and cyclohexadiene from spin decouplin
Precise audio-frequency markers for nuclear magnetic resonance spectra
System calibrates and records the responses of a nuclear magnetic resonance spectrometer. Calibration markers which have a highly stable frequency source are utilized to maintain frequency stability
Studies related to primitive chemistry. A proton and nitrogen-14 nuclear magnetic resonance amino acid and nucleic acid constituents and a and their possible relation to prebiotic
Preliminary proton nuclear magnetic resonance (NMR) studies were made to determine the applicability of this technique for the study of interactions between monomeric and polymeric amino acids with monomeric nucleic acid bases and nucleotides. Proton NMR results for aqueous solutions (D2O) demonstrated interactions between the bases cytosine and adenine and acidic and aromatic amino acids. Solutions of 5'-AMP admixed with amino acids exhibited more complex behavior but stacking between aromatic rings and destacking at high amino acids concentration was evident. The multisite nature of 5'-AMP was pointed out. Chemical shift changes for adenine and 5'-AMP with three water soluble polypeptides demonstrated that significant interactions exist. It was found that the linewidth-pH profile of each amino acid is unique. It is concluded that NMR techniques can give significant and quantitative data on the association of amino acid and nucleic acid constituents
System for detecting and estimating concentrations of gas or liquid analytes
A sensor system for detecting and estimating concentrations of various gas or liquid analytes. In an embodiment, the resistances of a set of sensors are measured to provide a set of responses over time where the resistances are indicative of gas or liquid sorption, depending upon the sensors. A concentration vector for the analytes is estimated by satisfying a criterion of goodness using the set of responses. Other embodiments are described and claimed
Co-polymer films for sensors
Embodiments include a sensor comprising a co-polymer, the co-polymer comprising a first monomer and a second monomer. For some embodiments, the first monomer is poly-4-vinyl pyridine, and the second monomer is poly-4-vinyl pyridinium propylamine chloride. For some embodiments, the first monomer is polystyrene and the second monomer is poly-2-vinyl pyridinium propylamine chloride. For some embodiments, the first monomer is poly-4-vinyl pyridine, and the second monomer is poly-4-vinyl pyridinium benzylamine chloride. Other embodiments are described and claimed
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Cooperation between the United States Department of Energy National Laboratories and Mayak Production Association for enhancements to material protection control and accounting systems
The Agreement Between the Department of Defense of the United States and The Ministry of the Russian Federation for Atomic Energy (MINATOM) Concerning Control, Accounting, and Physical Protection of Nuclear Material, as well as a subsequent amendment to that agreement and a joint statement signed by the Department of Energy (DOE) and MINATOM, resulted in the selection of the Mayak Production Association (MPA) as one of the Russian enterprises that would participate with DOE Laboratories in expanded cooperation aimed at enhancing Material protection, Control and Accounting (MPC&A) systems in both countries. This paper describes the nature and scope of the expanded cooperation involving MPA and six DOE laboratories at an operating civilian, spent-nuclear-fuel reprocessing plant designated RT-1. RT-1 produces, among other materials, reactor-grade plutonium dioxide, a direct-use material that is stored within the boundaries of this plant. Initial efforts at expanded cooperation will focus on enhancements to the existing MPC&A systems at MPA`s RT-1 plant
Near-infrared remote sensing of Los Angeles trace gas distributions from a mountaintop site
The Los Angeles basin is a significant anthropogenic source of major
greenhouse gases (CO2 and CH4) and the pollutant CO, contributing
significantly to regional and global climate change. We present a novel
approach for monitoring the spatial and temporal distributions of greenhouse
gases in the Los Angeles basin using a high-resolution spectroscopic remote
sensing technique. A new Fourier transform spectrometer called CLARS-FTS has
been deployed since May, 2010, at Jet Propulsion Laboratory (JPL)'s California Laboratory for Atmospheric
Remote Sensing (CLARS) on Mt. Wilson, California, for automated long-term
measurements of greenhouse gases. The instrument design and performance of
CLARS-FTS are presented. From its mountaintop location at an altitude of
1673 m, the instrument points at a programmed sequence of ground target
locations in the Los Angeles basin, recording spectra of reflected near-IR
solar radiation. Column-averaged dry-air mole fractions of greenhouse gases
(XGHG) including XCO2, XCH4, and XCO are retrieved several times
per day for each target. Spectra from a local
Spectralon® scattering plate are also
recorded to determine background (free tropospheric) column abundances above
the site. Comparisons between measurements from LA basin targets and the
Spectralon® plate provide estimates of the
boundary layer partial column abundances of the measured species. Algorithms
are described for transforming the measured interferograms into spectra, and
for deriving column abundances from the spectra along with estimates of the
measurement precision and accuracy. The CLARS GHG measurements provide a
means to infer relative, and possibly absolute, GHG emissions
Co-polymer Films for Sensors
Embodiments include a sensor comprising a co-polymer, the co-polymer comprising a first monomer and a second monomer. For some embodiments, the first monomer is poly-4-vinyl pyridine, and the second monomer is poly-4-vinyl pyridinium propylamine chloride. For some embodiments, the first monomer is polystyrene and the second monomer is poly-2-vinyl pyridinium propylamine chloride. For some embodiments, the first monomer is poly-4-vinyl pyridine, and the second monomer is poly-4-vinyl pyridinium benzylamine chloride. Other embodiments are described and claimed
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