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isomers
isomers Compounds having same chemical formula but
different structure.
isometric Drawing projection in which verticals are
vertical, other two axes are equally inclined, and distances
along all three axes are correct.
isometric switch Governs lock-on to aerial radar target.
iso-octane Hydrocarbon of paraffin series used as
reference index for anti-knock ratings, normally C 8 H 18 .
iso-opinion charts Graphic attempts to portray general
consensus of pilot evaluations, eg plotting undamped
natural frequency against short-period damping.
ISO-PA ISO(1) protocol architecture.
isopleth Line joining points of a constant value of a variable
with respect to space or time.
isopod Patented multi-mode packaging system.
iso-propyl nitrate Monopropellant for rockets and fuel
for starters.
isopycnic Of unchanging density, or of equal densities,
with respect to space or time.
ISOR Initial statement of requirements.
ISOS Inertially stabilized optronic sensor.
isoshear Joins places of equal wind shear.
isostatic Under equal pressure from all sides.
isotach Line joining points of equal wind speed, irrespective
of direction.
isotherm Line joining points of equal temperature.
isothermal At constant temperature.
isothermal atmosphere Hypothetical atmosphere in
hydrostatic equilibrium with constant temperature, also
called exponential.
isothermal change Change of volume-pressure humidity
and possibly other variables of perfect gas or gas mixture
at constant temperature.
isothermal forging Manufacturing a metal part close to
finish dimensions by squeezing it as powder in a die, or
between dies, under high pressure, both the die and the
part being under the same high temperature. See sintering.
isothermal layer See stratosphere.
isotope Radioactive form of (normally non-radioactive)
element.
isotope inspection X-ray using isotope as energy source.
isotope power Using isotope radiation as source of heat
energy in closed fluid cycle.
Isotran Isolator transition, isolates Gunn diode from
load mismatches and couples to waveguide and coaxial
conductor.
isotropic Having same properties in all directions.
ISP 1 Interim support plan (FAA).
2 Internet, or Inmarsat, service provider.
3 Integrated switching panel.
Isp Specific impulse.
ISPA International Society of Parametric Analysts.
ISPA, Ispa International Society of Parametric
Analysis (Int.).
Ispan Integrated strategic planning and analysis
network (Stratcom).
ISQC Intersound quality-control facility [checks videocassettes].
ISR 1 Initial, or intermediate, Service Release.
2 Intelligence, surveillance, reconnaissance.
3 Integrated signature reduction.
4 Image storage and retrieval.
5 Interrupt[ed] service routine.
Israc, ISRAC Intelligence, surveillance and reconnaissance
cell (NATO).
ISRBM Intelligence, surveillance and reconnaissance
battle manager (USAF).
ISRC 1 International Search and Rescue Convention.
2 Intelligence, surveillance and reconnaissance cell.
3 Intelligence, surveillance, reconnaissance and
communications (USAF).
ISRO Indian Space Research Organization (office,
Bangalore).
ISRU In situ resource utilization [space exploration].
ISS 1 Inertial, or integrated, sensor system, or suite.
2 Integrated sensor structure (Darpa).
3 Instrument subsystem.
4 Indonesian Space Society.
5 International Space Station [MCETF adds management
and cost evaluation task force] (US + R).
6 Information support system (ATC).
7 Integrated Satellite System.
8 Imaging scence subsystem [planetary].
9 Integrated surveillance, or sensor, system.
ISSC Integrated system support contract.
ISSI International Space Science Institute (Berne).
ISSM Institute of Safety and Systems Management, (U
of S California, Pasadena).
ISSN Intermediate system subnetwork.
ISSR Independent secondary surveillance radar.
ISST ICBM silo superhardening technology.
IST Institute for Simulation and Training (University
of Central Florida).
Istar 1 Integrated system test of an air-breathing rocket
(NASA).
2 Intelligence, surveillance, target acquisition and
reconnaissance.
ISTAT International Society of Transport Aircraft
Traders/Trading [office, Arlington, VA].
ISTD Integrated space-technology demonstration
(USAF).
ISTN Interfacility Satellite Telecommunications
Network.
ISTP Integrated Space Transportation Plan (NASA).
ISTR Integrated systems test rig.
Istres Location of chief French Government flight-test
establishment, the Centre des Essais en Vol (CEV), whose
other locations are at Brétigny and Cazaux.
ISTS Integrated space transport system.
ISU 1 Intelligent, or inertial, or integrated, sensor unit.
2 Ignition servo unit.
3 Initial signal unit.
4 Intercommunication set [control] unit.
5 International Space University [F-67400 Illkirch] (F).
6 Information switching unit.
ISURSS Interim small unit remote sensing system[s].
ISV 1 Intensified silicon target vidicon.
2 In-seat video [TV screen].
ISVR Institute of Sound and Vibration Research
(Southampton, UK).
ISWL Isolated single-wheel load.
IT 1 Inclusive tour.
2 Information technology.
3 Interactive touchscreen.
4 Integral terminal, an HMI.
5 Independently targetable.
Total impulse.
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