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Link to Subject Category
dark energy - 90
dark matter - 90
darkroom equipment - 35
data acquisition programs - 61
data compilation systems - 62
data input devices - 60
data management systems - 62
data processing systems - 62
data processing - 60
data sampling - 65
data smoothing - 65
data transmission applications - 32
data transmission development - 32
data transmission equipment - 32
data transmission research - 32
data transmission techniques - 32
databases - 82
debugging programs - 61
Decca navigation system - 04
deceleration effects (human) - 52
decision making - 81
decision theory - 66
decomposition (propellants and fuels) - 28
decompression sickness - 52
deep space instrumentation facilities - 14
Deep Space Network - 17
deicing systems (aircraft) - 05
depressurization systems (aircraft) - 05
depressurization systems (spacecraft) - 18
desertification - 43
design of launch vehicles, tanks, components, systems - 15
detecting devices (aircraft) - 06
detecting devices (spacecraft) - 19
detectors - 35
detonation processes - 25
development facilities (aircraft) - 09
development facilities (space) - 14
development of alloys - 26
development of nonmetallic materials - 27
development of propellants and fuels - 28
diagnostic procedures (software) - 61
dielectric materials properties - 76
dielectrics (electronic application) - 33
dies - 37
diesel engines (aircraft) - 07
diesel engines (non-aircraft) - 37
diets (space missions) - 54
difference equations - 64
differential equations - 64
differential geometry - 67
differentiation (mathematics) - 64
diffusers (aircraft engines) - 07
digital communications systems (aircraft) - 04
digital communications systems (spacecraft) - 17
digital communications systems (theory and techniques) - 32
digital computers - 60
digital storage devices - 60
digital storage techniques - 60
diodes - 33
discovery of celestial bodies - 89
display devices (aircraft) - 06
display devices (spacecraft) - 19
display engineering - 31
distributed data processing - 62
diurnal effects (biological, animal and plant) - 51
diurnal effects (human) - 52
diurnal effects (meteorology) - 47
dividers (electric) - 33
docking (spacecraft) - 18
document markup languages (computer programming) - 61
document markup languages (information transfer) - 82
document miniaturization - 82
document processing - 82
documentation - 82
donors (solid state) - 76
Doppler effect (acoustics) - 71
Doppler navigation systems - 04
drag reduction (effects and techniques) - 02
drives - 37
dutch roll - 08
dwarf planets - 91
dye lasers - 36
dynamic oceanography - 48
dynamic programming - 66
dynamic stability (aircraft) - 08
dynamic stability (spacecraft) - 18
dynamic structural analysis - 39
dynamics (physics) - 70
dysbarism - 52
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