The Electronic Nose: New Technology Infusion-Advanced Environmental Monitoring and Control for Space Station, Final Report
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electronic nose ENose air qaulity monitor space st↗
Engineering topics
Ryan, M.
Publications and source records attributed to Ryan, M..
Results from the Space Shuttle STS-95 Electronic Nose Experiment
A miniature electronic nose in which the sensing media are insulating polymers loaded with carbon black as a conductive medium has been designed and built at the Jet Propulsion Laboratory.
Electronic↗
Performance Parameters of TiN Electrodes for AMTEC Cells
The results of several experiments in which TiN electrodes have been studied at 1120-1200 K are described here.
AMTEC↗
Lifetimes of AMTEC Electrodes: Molybdenum, Rhodium-Tungsten and Titanium Nitride
The lifetime of three types of AMTEC electrodes is predicted from the rate of grain growth in the electrode.
AMTEC↗
Thermal Stability of Beta-Alumina Solid Electrolyte Under AMTEC Operating Conditions
A critical component of alkali metal thermal-to electric converter (AMTEC) devices for long duration space missions is the sodium beta-alumina solid electrolyte ceramic (BASE), for which there exists no substitute.
AMTEC beta-alumina solid electrolyte ceramic↗
Development of Thick-Film Themoelectric Microcoolers Using Electrochemical Deposition
Advanced thermoelectric microdevices integrated into thermal management packages and low power, electrical source systems are of interest for a variety of space and terrestrial applications.
thermoelectric microdevices films electrochemistry↗
Advanced Laser Processing of Materials--Fundamentals and Applications
Preparation of amorphous thin films in semiconductors and their transition to the crystalline phase may apply to switching devices. Surfaces of single crystal samples of bulk In2Se3 and thin films of InSe were treated using an excimer laser, and microscopic examination showed the treated portions of the surface had become amorphous. Film samples of InSe were laser-treated like the bulk samples. Examination of these treated flims showed shifts in the optical transmittance spectra as well as surface morphology changes.
amorphous thin films semiconductors crystalline ph↗
Electrochemical Deposition of Bi(sub 2)Te(sub 3) Thin Films for Thermoelectric Device Applications
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electrochemical deposition thin films semiconducto↗
Gas Sensor Test Chip
A new test chip is being developed to characterize conducting polymers used in gas sensors. The chip, a seven-layer cofired alumina substrate with gold electrodes, contains 11 comb and U- bend test structures. These structures are designed to measure the sheet resistance, conduction anisotropy, and peripheral conduction of spin-coated films that are not subsequently patterned.
conducting polymers gas sensors test chipnd periph↗
Potassium Beta-Alumina/Molybdenum/Potassium Electrochemical Cells
potassium alkali metal thermal-to-electric converter (K-AMTEC) cells utilizing potassium beta alumina solid electrolyte (K-BASE) are predicted to have improved properties for thermal to electric conversion at somewhat lower temperatures than sodium AMTEC's.
thermal-to-electric converter vapor pressure ceram↗
The Galactic distribution of free electrons
Various radioastronomical measurements are synthesized here to derive a large-scale Galactic model for the distribution of free electrons and for microstructure in the distribution that seems to be caused by turbulence in the ISM. A two-component axisymmetric model fitted on all scales from 100 km to a few pc, accounts for most of the data. A population of dense, discrete clouds is also needed, and there is some evidence for spiral structure. The model allows better distance estimates for pulsars to be made. The implications of the model for the structure and ionization of the ISM and for the distribution of interstellar turbulence and the diffusion of cosmic rays are discussed.
Cordes, J. M.↗
Rapid and precise measurement of flatband voltage
The paper outlines the design, principles of operation, and calibration of a five-IC network intended to give a rapid, precise, and automatic determination of the flatband voltage of MOS capacitors. The basic principle of measurement is to compare the analog output voltage of a capacitance meter - which is directly proportional to the capacitance being measured - with a preset or dialed-in voltage proportional to the calculated flatband capacitance by means of a comparator circuit. The bias to the MOS capacitor supplied through the capacitance meter is provided by a ramp voltage going from a negative toward a positive voltage level and vice versa. The network employs two monostable multivibrators for reading and recording the flatband voltage and for resetting the initial conditions and restarting the ramp. The flatband voltage can be held and read on a digital voltmeter.
Li, S. P.↗
Hamiltonian cosmology.
The study of cosmological models by means of equations of motion in Hamiltonian form is considered. Hamiltonian methods applied to gravity seem to go back to Rosenfeld (1930), who constructed a quantum-mechanical Hamiltonian for linearized general relativity theory. The first to notice that cosmologies provided a simple model in which to demonstrate features of Hamiltonian formulation was DeWitt (1967). Applications of the ADM formalism to homogeneous cosmologies are discussed together with applications of the Hamiltonian formulation, giving attention also to Bianchi-type universes. Problems involving the concept of superspace and techniques of quantization are investigated.
Ryan, M.↗