Engineering topics

Roy, D.

Publications and source records attributed to Roy, D..

4 records

NASA NTRS1985

Experiments with Ada

A 1200-line Ada source code project simulating the most basic functions of an operations control center was developed. We selected George Cherry's Process Abstraction Methodology for Embedded Large Applications (PAMELA) and DEC's Ada Compilation System (ACS) under VAX/VMS to build the software from requirements to acceptance test. The system runs faster than its FORTRAN implementation and was produced on schedule and under budget with an overall productivity in excess of 30 lines of Ada source code per day.

Roy, D.↗

NASA NTRS1973

Dynamics of moisture diffusion through a partially liquid filled porous matrix.

Models for unsteady water transport in fuel cell configurations of Bacon-Pratt and Whitney type are derived. Tests with a specially constructed isothermal cell producing no water and order of magnitude analysis show that diffusion through the liquid alone cannot account for the observed behavior. An analytical solution which includes diffusion in both the liquid and the gas spaces of the matrix is in better agreement with the data than models which consider diffusion in either the liquid or in the gas phase alone.

Murty, B. G. K.↗

NASA NTRS1970

Thermal conductivity of gases - Organic compounds at atmospheric pressure

Thermal conductivity for organic compound gases at atmospheric pressure

Roy, D.↗

NASA NTRS1968

Thermal conductivity of gases - Hydrocarbons at normal pressures.

Thermal conductivity of gaseous hydrocarbons at normal pressures, noting translational, rotational and vibrational contributions

Roy, D.↗