1Dk4eXg

syncrude
part of transmitted waveform to maintain lock on synchronization.
syncrude Synthetic crude petroleum; starting point for
various synthesized petroleum-type hydrocarbons.
synergic ascent Following synergic curve.
synergic curve Trajectory for departing spacecraft for
minimum energy requirement, ie lowest propellant
consumption for given position and velocity; on Earth
initially vertical to leave denser atmosphere quickly and
then curving to take advantage of Earth’s rotation.
synergism Favourable interrelationship between
variables such that overall benefit of a change is greater
than sum of individual gains; eg scaling down aircraft size
has synergistic effects on structure weight, drag, engine size,
fuel consumption and fuel mass for given range.
Synjet Non-petroleum-based fuel produced to current
(or broadened) Jet A specification.
synodic period Interval of time between identical
positions of celestial body in solar system measured with
respect to Sun.
synodic satellite Hypothetical Earth satellite located on
Earth/Moon axis at 0.84 lunar distance from Earth.
SYNOP Special meteorological report.
synoptic chart Standardized map of weather, showing
isobars, fronts and weather symbols, and covering large
area for one particular time.
synoptic meteorology Collection of meteorological information
covering large area at one time (as near as possible
to present), esp. with view to forecasting.
syntactic foam Composite material consisting predominantly
of premanufactured hollow microspheres
embedded in resin; for radomes usually 30-140 µ spheres
with 1.5 µ wall, in epoxy or polyimide matrix.
synthetic-aperture radar Various methods of summing
the returns from many locations [eg, at TAS 600 kt, spacing
1 kHz gives returns from 1 ft apart, so a block of 50 gives
definition equal to 50-ft antenna].
synthetic lubricants Post-1948 families of turbine oils
originally based on esters of sebacic acid, especially dioctyl
sebacate; later with complex thickeners added.
synthetic resins Too numerous to outline, but mainly
polymers or copolymers and often thermosetting; used as
bases for many materials (eg plastics and paints) and as
adhesives, including nearly all those for aerospace bonding
and for fibre-reinforced composites.
synthetic rubber Vast family of rubber-like materials originally
(1917) based on isoprene and today nearly all based
on copolymers of butadiene; includes many solid propellants.
synthetic training All training that simulates, eg with
simple Link, mimic boards, system rigs, air-combat
simulators and, esp., flight simulators. Also generally held
to include actual flight training when something, eg absence
of external vision, is simulated.
SyOP Security operating procedure[s].
Syrca Système de restitution de combat aérien (F).
syrup Generic term for accumulation of spilled beverages,
water [and condensate], toilet and lavatory fluids and dust.
sys System, or system identifier.
SZH
Syscat-B System Category B (FAA format).
Sysci System configuration item.
Sysco System co-ordination (ATC).
Sysop Systems operator.
SYSPO Systems Command Program Office[r] (USAF).
system 1 Generalized term for any dynamically
functioning organization of man-made devices.
2 Portion of vehicle, eg aircraft, missile, etc, forming integral
network of related and inter-controlled devices to
accomplish set of specif. related functions.
3 Composite of equipment, skills and techniques capable
of performing and/or supporting operational role (USAF).
4 Often used to mean (1) plus supporting equipment,
documents, training devices and all other products and
services, as in weapon *.
5 Incorrectly used to mean mere assemblage of mechanical
parts, eg engine LP *.
system concept Integrated approach to design, procurement
or operation of system in sense [4].
System Design Review The PSD leads to Requirements
Analysis which the SDR supports in parallel by providing
a top-level review of all relevant hardware to ensure that
Preliminary Software and Hardware design can proceed
with confidence.
system discharge indicator, SDI Yellow disc or blow-out
plug in aircraft skin to indicate fire-extinguishing system
discharged for reason other than fire or overheat warning.
Système International In full, SI d’Unités, system of
unified units of measurement adopted by all principal
industrialized countries since 1960 and gradually being
implemented; seven base units, metre (m), kilogram(me)
(kg), second (s), ampere (A), kelvin (K), candela (cd) and
mole (mol).
System Requirements Review A top-level multidisciplinary
review to check the requirements against the original
concept objective. It makes possible the Preliminary
System Design.
system[s] engineering Not briefly definable, but extremely
broad discipline akin to operations research whose main
objective is to apply broad overview of entire system [4] in
order to advise customer and/or management on objectives
and possibilities and refine and integrate all subsystems
before start of hardware design.
System Safety Analysis The final stage in perfecting a
system prior to certification. The SSA studies the aresults
from the Functional Hazard Analysis and the answers
proposed by the Preliminary SSA, and in a rigorous
manner confirms that the proposed system does meet certification
requirements.
system source selection Selection by government of industrial
source, known as system prime.
system turnover Formal acceptance by customer of
responsibility for system [4].
Systo Systems Command program officer (USAF).
Systrid Powerful 3-D CAD technique (Battelle).
syzygy Point on orbit, esp. that of Moon, at which body
is in conjunction or opposition.
SZH Schweizerische Zentrale für Handelsförderung
(Switzerland).
676