4,616 research outputs found
Pre-emphasis determination for an S-band constant bandwidth FM/FM station
Telemetry bands are being reassigned to UHF at 1500 and 2200 MHz. Conversion primarily requires changes in equipment used in RF link, while many of same subcarrier oscillators, mixer amplifiers, and frequency discriminators can be used
Measured electron contribution to Shuttle plasma environment: Abbreviated update
The differential energy spectra of electrons between 1 and 100 eV were measured by an electron spectrometer flown on an early shuttle. This energy range was scanned in 64 incremental steps with a resolution of 7%. The most striking feature that was observed throughout these spectra was a relatively flat distribution of the higher energy electrons out to 100 eV. This is in contrast to normal ambient spectra which consistently show a rapid decline in quantitative flux beyond 50 to 55 eV. The lower energy (1 to 2 eV) end of these spectra showed steep thermal trails comparable to normal ambient spectral structure. In general, daytime fluxes were significantly higher than those obtained during nighttime measurements. Quantitative flux excursions which may possibly be associated with thruster firing were frequently observed. Spectral structure suggestive of the N2 vibrational excitation energy loss mechanism was also seen in the data from some measurement periods. Examples of these spectra are shown and possible correlations are discussed
Higher Order and Secondary Hochschild Cohomology
In this note we give a generalization for the higher order Hochschild
cohomology and show that the secondary Hochschild cohomology is a particular
case of this new construction
Simulation analysis of a microcomputer-based, low-cost Omega navigation system
The current status of research on a proposed micro-computer-based, low-cost Omega Navigation System (ONS) is described. The design approach emphasizes minimum hardware, maximum software, and the use of a low-cost, commercially-available microcomputer. Currently under investigation is the implementation of a low-cost navigation processor and its interface with an omega sensor to complete the hardware-based ONS. Sensor processor functions are simulated to determine how many of the sensor processor functions can be handled by innovative software. An input data base of live Omega ground and flight test data was created. The Omega sensor and microcomputer interface modules used to collect the data are functionally described. Automatic synchronization to the Omega transmission pattern is described as an example of the algorithms developed using this data base
A microcomputer-based low-cost Omega navigation system
The application of a low cost, commercially available microcomputer as the navigation processor for a simplified OMEGA navigation system is an area of current research. The interface of a low cost front end OMEGA sensor is described and an example of the phase processing software and navigation routines is given. Emphasis is placed on the description of results obtained with the software version of the OMEGA burst filter known as the memory aided phase locked loop
Financial Confidence Among Retirees: The Role of Financial Advice and Planning Duration
This paper examines the factors contributing to the financial confidence of retirees using the 2008 wave of a new nationally representative proprietary dataset of retirees. The results indicate that income, risk tolerance, duration of pre-retirement financial planning, and the utilization of professional financial advice are positive predictors of retirement confidence. The results also indicate that retirees with defined benefit plans are more likely to be confident about their retirement and conversely, retirees with defined contribution plans are less likely to be confident about their retirement. This paper provides useful discussion for financial planning practitioners, economists, and policy makers.Retirement planning, Financial advice, Planning duration
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