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1 stacked crystal filter
Электроника: составной кварцевый фильтрУниверсальный англо-русский словарь > stacked crystal filter
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2 stacked crystal filter
English-Russian electronics dictionary > stacked crystal filter
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3 stacked crystal filter
The New English-Russian Dictionary of Radio-electronics > stacked crystal filter
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4 stacked crystal filter
English-Russian dictionary of electronics > stacked crystal filter
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5 filter
1) фильтр || фильтровать; использовать фильтр2) светофильтр, оптический фильтр•- acceptance filter
- acoustic filter
- acoustic surface-wave filter
- acoustic-wave filter
- acoustooptical filter
- active filter
- ActiveX server filter
- adaptive filter
- air filter
- air-spaced filter
- all-pass filter
- all-pole filter
- all-zero filter
- ambient-light filter
- amplitude filter
- analog-computer filter
- analog-computer-type filter
- antialiasing filter
- apodized filter
- array-processing filter - band-stop filter
- barometric filter
- barometric air filter
- Bessel filter
- binary filter - biquad filter
- biquartic filter
- birefringent filter
- birefringent optical filter
- bleaching filter
- bogon filter
- Bozo filter
- BP filter
- breather filter
- bridge filter
- bridged-T filter
- broadcast filter
- brute-force filter
- Butterworth filter
- canonical recursive filter
- capacitor-input filter
- carrier transfer filter
- Cauer filter
- cavity filter
- cavity-coupled filter
- CCTT filter
- ceramic filter
- channel filter
- channel-bank filter
- channel-separation filter
- Chebyshev filter
- chirp-generating filter
- choke-input filter
- Christiansen filter
- chroma filter
- click filter
- clutter suppression filter
- C-message filter
- coaxial filter
- coherent memory filter
- color filter
- colored-glass filter
- color separation filter
- comb filter
- compensating filter
- complex spatial filter
- composite filter
- constant-current filter
- constant-K filter
- continuous capacitive tapping transversal filter
- continuous inductive tapping transversal filter
- continuously tunable filter
- continuous resistive tapping transversal filter
- convolution filter
- correction filter
- corrective filter
- crystal filter
- dechirping filter
- deconvolution filter
- decoupling filter
- deemphasis filter
- delay-line filter
- delta-modulation filter
- demodulator filter - dichroic filter
- dielectric filter
- dielectric slab filter
- digital filter
- digital frequency mapping filter
- digitally tuned filter - directional filter
- discrete filter
- discrimination filter
- dispersion filter
- dispersive filter
- dm filter
- Doppler filter
- dynamic tracking filter
- electric filter
- electric-wave filter
- electronically tunable filter
- elliptic filter
- elliptic-function filter
- enhancement filter - Fabry-Perot interference filter
- feed-forward MTI radar filter
- feedthrough filter
- fiber filter
- finite impulse-response filter
- finite-duration impulse-response filter
- fin-line filter
- FIR filter
- first-order filter
- fixed filter
- fixed-frequency filter
- fixed-point digital filter
- floating-point digital filter
- formant filter
- Fourier transform filter
- four-port filter
- FP filter
- Frechet filter
- frequency filter
- frustrated total reflection filter
- gelatin filter
- generating filter
- glare filter
- glass filter
- graded filter
- gray filter - harmonic filter
- heat filter
- HF filter
- high filter
- high-cut filter
- high-frequency filter
- high-order filter
- high-pass filter
- hiss filter
- hologram filter
- holographic filter
- IIR filter
- inductive-input filter
- infinite impulse-response filter
- infinite-duration impulse-response filter
- infrared filter
- in-line filter
- integrated-and-dump filter
- integrating filter
- interference filter
- interferential polarizational filter
- intermediate-frequency filter
- interpolation filter
- interstage filter
- inverse filter
- inverse-feedback filter
- ion-implanted array filter
- IR filter
- iterative filter
- junction filter
- Kalman filter
- key-click filter
- keying filter
- kill filter
- L-filter
- ladder-type filter
- lattice filter
- lead-zirconate-titanate filter
- leapfrog filter
- light filter
- line filter
- linear filter
- linear FM pulse compression filter
- linear space-invariant filter
- linear space-noninvariant filter
- liquid filter
- long-wavelength cutoff filter
- loop filter
- lossless filter
- low filter
- low-and-high-pass filter
- low-cut filter - L-section filter
- L-type filter
- lumped-constant filter
- Lyot filter
- magic-T filter
- magnetically tuned filter
- magnetooptical filter
- magnetostatic-wave filter
- magnetostrictive filter
- matched filter
- matched spatial filter
- matching filter
- m-derived filter
- mechanical filter
- mechanical-wave filter
- median filter
- microwave filter
- MIDI filter
- minimum-delay filter
- minimum-phase filter
- mismatched filter
- mode filter
- modulation filter
- multiple-bandpass filter
- multiple-reflection filter
- multiple-resonant-circuit filter
- multi-resonator filter
- multisection filter
- multistage filter
- narrow-band filter
- narrow-cut filter
- ND filter
- network filter
- neutral filter
- neutral-density filter
- neutral gray filter
- noise filter
- nonlinear filter
- nonrecursive filter
- nonselective filter
- notch filter
- n-section filter
- one-dimensional median filter
- optical filter
- packet filter
- parallel-T notch filter
- parametric filter
- partitioned adaptive filter
- passive filter
- phase filter
- photopic filter
- piezoelectric filter
- piezoelectric ceramics filter
- piezoelectric crystal filter
- pi-section filter
- plasma electroacoustic resonance filter
- plastics filter
- polarization interference filter
- polarizing filter
- polaroid filter
- pole-zero filter
- polynomial filter
- pop filter
- postemphasis filter
- postequalization filter
- powder filter
- power-line filter
- powerpack filter
- prediction filter - preequalization filter
- prewhitening filter
- programmable binary transversal filter
- pseudo-noise matched filter
- pulse-compression filter
- PZT filter
- quadrature filter
- quasi-optical filter
- radio-frequency interference filter
- range filter
- RC-filter
- recirculating filter
- recirculating air filter
- rectifier filter - reflection filter
- reflection holographic filter
- rejection filter
- resistance-capacitance filter
- resonant filter
- reverberation suppression filter
- RF filter
- RFI filter
- ripple filter
- roof filter
- rumble filter
- sampled-data filter
- SAW filter
- SC filter
- scatter filter
- scratch filter
- seasonal filter
- selective filter
- sending filter
- separation filter
- series m-derived filter
- SFG filter
- shaping filter
- sharp-cutoff filter
- short-term adaptive filter
- short-wavelength cutoff filter
- shunt m-derived filter
- signal-flow-graph filter
- signal-separation filter
- single-sideband filter
- slope filter
- slot filter
- slotted filter
- smoothing filter
- solid organic-dye filter
- solid-state filter
- sound-effect filter
- spatial filter
- spatial frequencyfilter
- spatial median filter
- spin-wave filter
- stacked crystal filter
- state-variable filter
- strip-line filter
- superconducting filter
- surface-acoustic-wave filter
- surface-wave chirp filter - switched-capacitor filter
- systolic filter
- tapped-delay-line filter
- tee filter
- temporal median filter
- thin-film filter
- thin-metal-film filter
- through filter
- time-dependent filter
- time-invariant filter
- time-varying filter
- tracking filter
- transmission filter
- transmission-line filter
- transparency filter
- transversal filter
- T-section filter
- tunable filter
- tuned filter
- twin-T filter
- two-dimensional filter
- two-dimensional median filter
- two-port filter
- ultraviolet filter
- unvoiced filter
- UV filter
- variable filter
- velocity filter
- vestigial-sideband filter
- voice filter
- voltage-controlled variable-bandwidth filter
- wave filter
- waveguide filter
- weighted filter
- whitening filter
- wide-angle filter
- wide-band filter
- wide-cut filter
- Wiener filter
- Wratten filter
- YIG filter
- yttrium-iron garnet filter
- zero-memory filter -
6 filter
1) фильтр || фильтровать; использовать фильтр2) светофильтр, оптический фильтр•- acceptance filter
- acoustic filter
- acoustic surface-wave filter
- acoustic-wave filter
- acoustooptical filter
- active filter
- ActiveX server filter
- adaptive filter
- air filter
- air-spaced filter
- all-pass filter
- all-pole filter
- all-zero filter
- ambient-light filter
- amplitude filter
- analog-computer filter
- analog-computer-type filter
- antialiasing filter
- apodized filter
- array-processing filter
- avalanche matched filter
- balanced filter
- band-elimination filter
- band-exclusion filter
- bandpass filter
- band-rejection filter
- band-splitting filter
- band-stop filter
- barometric air filter
- barometric filter
- Bessel filter
- binary filter
- binary transversal filter
- binomial filter
- biquad filter
- biquartic filter
- birefringent filter
- birefringent optical filter
- bleaching filter
- bogon filter
- Bozo filter
- BP filter
- breather filter
- bridge filter
- bridged-T filter
- broadcast filter
- brute-force filter
- Butterworth filter
- canonical recursive filter
- capacitor-input filter
- carrier transfer filter
- Cauer filter
- cavity filter
- cavity-coupled filter
- CCTT filter
- ceramic filter
- channel filter
- channel-bank filter
- channel-separation filter
- Chebyshev filter
- chirp-generating filter
- choke-input filter
- Christiansen filter
- chroma filter
- click filter
- clutter suppression filter
- C-message filter
- coaxial filter
- coherent memory filter
- color filter
- color separation filter
- colored-glass filter
- comb filter
- compensating filter
- complex spatial filter
- composite filter
- constant-current filter
- constant-K filter
- continuous capacitive tapping transversal filter
- continuous inductive tapping transversal filter
- continuous resistive tapping transversal filter
- continuously tunable filter
- convolution filter
- correction filter
- corrective filter
- crystal filter
- dechirping filter
- deconvolution filter
- decoupling filter
- deemphasis filter
- delay-line filter
- delta-modulation filter
- demodulator band filter
- demodulator filter
- dereverberation filter
- dichroic filter
- dielectric filter
- dielectric slab filter
- digital filter
- digital frequency mapping filter
- digital matched filter
- digital spectral mapping filter
- digitally tuned filter
- directional filter
- discrete filter
- discrimination filter
- dispersion filter
- dispersive filter
- dm filter
- Doppler filter
- dynamic tracking filter
- electric filter
- electric-wave filter
- electronically tunable filter
- elliptic filter
- elliptic-function filter
- enhancement filter
- extended Kalman filter
- Fabry-Perot filter
- Fabry-Perot interference filter
- feed-forward MTI radar filter
- feedthrough filter
- fiber filter
- finite impulse-response filter
- finite-duration impulse-response filter
- fin-line filter
- FIR filter
- first-order filter
- fixed filter
- fixed-frequency filter
- fixed-point digital filter
- floating-point digital filter
- formant filter
- Fourier transform filter
- four-port filter
- FP filter
- Frechet filter
- frequency filter
- frustrated total reflection filter
- gelatin filter
- generating filter
- glare filter
- glass filter
- graded filter
- gray filter
- grounded-capacitor low-pass filter
- gyrator filter
- harmonic filter
- heat filter
- HF filter
- high filter
- high-cut filter
- high-frequency filter
- high-order filter
- high-pass filter
- hiss filter
- hologram filter
- holographic filter
- IIR filter
- inductive-input filter
- infinite impulse-response filter
- infinite-duration impulse-response filter
- infrared filter
- in-line filter
- integrated-and-dump filter
- integrating filter
- interference filter
- interferential polarizational filter
- intermediate-frequency filter
- interpolation filter
- interstage filter
- inverse filter
- inverse-feedback filter
- ion-implanted array filter
- IR filter
- iterative filter
- junction filter
- Kalman filter
- key-click filter
- keying filter
- kill filter
- ladder-type filter
- lattice filter
- lead-zirconate-titanate filter
- leapfrog filter
- L-filter
- light filter
- line filter
- linear filter
- linear FM pulse compression filter
- linear space-invariant filter
- linear space-noninvariant filter
- liquid filter
- long-wavelength cutoff filter
- loop filter
- lossless filter
- low filter
- low-and-high-pass filter
- low-cut filter
- low-pass filter
- LP filter
- L-section filter
- L-type filter
- lumped-constant filter
- Lyot filter
- magic-T filter
- magnetically tuned filter
- magnetooptical filter
- magnetostatic-wave filter
- magnetostrictive filter
- matched filter
- matched spatial filter
- matching filter
- m-derived filter
- mechanical filter
- mechanical-wave filter
- median filter
- microwave filter
- MIDI filter
- minimum-delay filter
- minimum-phase filter
- mismatched filter
- mode filter
- modulation filter
- multiple-bandpass filter
- multiple-reflection filter
- multiple-resonant-circuit filter
- multi-resonator filter
- multisection filter
- multistage filter
- narrow-band filter
- narrow-cut filter
- ND filter
- network filter
- neutral filter
- neutral gray filter
- neutral-density filter
- noise filter
- nonlinear filter
- nonrecursive filter
- nonselective filter
- notch filter
- n-section filter
- one-dimensional median filter
- optical filter
- packet filter
- parallel-T notch filter
- parametric filter
- partitioned adaptive filter
- passive filter
- phase filter
- photopic filter
- piezoelectric ceramics filter
- piezoelectric crystal filter
- piezoelectric filter
- pi-section filter
- plasma electroacoustic resonance filter
- plastics filter
- polarization interference filter
- polarizing filter
- polaroid filter
- pole-zero filter
- polynomial filter
- pop filter
- postemphasis filter
- postequalization filter
- powder filter
- power-line filter
- powerpack filter
- prediction filter
- prediction-error filter
- preemphasis filter
- preequalization filter
- prewhitening filter
- programmable binary transversal filter
- pseudo-noise matched filter
- pulse-compression filter
- PZT filter
- quadrature filter
- quasi-optical filter
- radio-frequency interference filter
- range filter
- RC-filter
- recirculating air filter
- recirculating filter
- rectifier filter
- recurrent extended Kalman filter
- recursive filter
- reflection filter
- reflection holographic filter
- rejection filter
- resistance-capacitance filter
- resonant filter
- reverberation suppression filter
- RF filter
- RFI filter
- ripple filter
- roof filter
- rumble filter
- sampled-data filter
- SAW filter
- SC filter
- scatter filter
- scratch filter
- seasonal filter
- selective filter
- sending filter
- separation filter
- series m-derived filter
- SFG filter
- shaping filter
- sharp-cutoff filter
- short-term adaptive filter
- short-wavelength cutoff filter
- shunt m-derived filter
- signal-flow-graph filter
- signal-separation filter
- single-sideband filter
- slope filter
- slot filter
- slotted filter
- smoothing filter
- solid organic-dye filter
- solid-state filter
- sound-effect filter
- spatial filter
- spatial frequency filter
- spatial median filter
- spin-wave filter
- stacked crystal filter
- state-variable filter
- strip-line filter
- superconducting filter
- surface-acoustic-wave filter
- surface-wave chirp filter
- surface-wave comb filter
- swept filter
- switched-capacitor filter
- systolic filter
- tapped-delay-line filter
- tee filter
- temporal median filter
- thin-film filter
- thin-metal-film filter
- through filter
- time-dependent filter
- time-invariant filter
- time-varying filter
- tracking filter
- transmission filter
- transmission-line filter
- transparency filter
- transversal filter
- T-section filter
- tunable filter
- tuned filter
- twin-T filter
- two-dimensional filter
- two-dimensional median filter
- two-port filter
- ultraviolet filter
- unvoiced filter
- UV filter
- variable filter
- velocity filter
- vestigial-sideband filter
- voice filter
- voltage-controlled variable-bandwidth filter
- wave filter
- waveguide filter
- weighted filter
- whitening filter
- wide-angle filter
- wide-band filter
- wide-cut filter
- Wiener filter
- Wratten filter
- YIG filter
- yttrium-iron garnet filter
- zero-memory filterThe New English-Russian Dictionary of Radio-electronics > filter
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7 cell
1) клетка3) элемент7) эл. шайба ( выпрямителя)8) эл. изолировочная гильза9) камера для работы с радиоактивными веществами10) строит. сегмент ребристого свода11) мн. ч. строит. пустоты в кирпиче или камне12) машиностр. гибкий производственный модуль, ГП-модуль, ГПМ; гибкий автоматизированный участок, ГАУ; ставочный участок13) ячейка памяти14) грозовой очаг, грозовой район ( в зоне полёта)16) полигр. растровая ячейка ( формы глубокой печати)17) пищ. диффузор18) ячейка ( тарный вкладыш)•cell with free diffusion boundaries — ячейка со свободной диффузией на границе жидкостей;cell with liquid junction — ячейка с жидкостным соединением;cell with open liquid junction — ячейка с открытым жидкостным соединением;cell without transference — элемент без переноса;-
polka dot solar cell
-
absorbing cell
-
accumulator cell
-
acid cell
-
Acker cell
-
AD cell
-
aeration cell
-
aftertreatment cell
-
agglomerate cell
-
air-depolarizing cell
-
air-hydrogen fuel cell
-
airlift flotation cell
-
airproof cell
-
alkali-chlorine cell
-
alkaline cell
-
Allen-Moore cell
-
aluminum cell
-
amalgam cell
-
ammonia-air fuel cell
-
amorphous solar cell
-
anisotropically etched solar cell
-
aqueous fuel cell
-
arc-heated cell
-
array cell
-
asymmetrical cell
-
automated cell
-
back-emf cell
-
back-surface-field solar cell
-
bag-type cell
-
balloon calibrated solar cell
-
basket cathode cell
-
battery cell
-
bearing cell
-
Becquerel cell
-
bell-jar cell
-
bell cell
-
bending part cell
-
bifacial solar cell
-
Billiter cell
-
bimorph cell
-
binary cell
-
biomass fuel cell
-
bipolar cell
-
bit cell
-
body cell
-
body-centered cubic cell
-
border cell
-
box cell
-
Bragg cell
-
brine cell
-
bubble cell
-
cadmium cell
-
carbon cell
-
cascade solar cell
-
cell of table
-
central cell
-
chargeable cell
-
chemical cell
-
chlorine cell
-
Clark cell
-
cleaner cell
-
climatic cell
-
closed cell
-
close-packed atomic cell
-
color cell
-
combustion cell
-
competent cell
-
complex galvanic cell
-
composite cell
-
conductivity cell
-
consumable-electrode cell
-
convection cell
-
corrosion cell
-
counter electromotive cell
-
counter cell
-
counting cell
-
crown cell
-
crystal cell
-
data cell
-
delay cell
-
desalting cell
-
detector cell
-
diamond cubic unit cell
-
diaphragm cell
-
diffraction cell
-
diffused-junction solar cell
-
diffusion cell
-
disk stack cell
-
Doppler-resolution cell
-
drift field solar cell
-
driver cell
-
dry cell
-
dummy cell
-
dye cell
-
ECM cell
-
edge-illuminated solar cell
-
Edison storage cell
-
electrical electrochemical cell
-
electric electrochemical cell
-
electrical cell
-
electric cell
-
electrochemical machining cell
-
electroluminescent cell
-
electrolytic cell
-
electrowinning cell
-
emergency cell
-
emission cell
-
end cell
-
epitaxial solar cell
-
exposure cell
-
fabric cell
-
face-centered cubic cell
-
faceted solar cell
-
Faraday cell
-
filter cell
-
flat cell
-
flotation cell
-
flow-through cell
-
fluid cooled solar cell
-
fluorine cell
-
front-surface-field solar cell
-
front-wall solar cell
-
froth flotation cell
-
fuel cell
-
fuel debottling cell
-
fuel handling cell
-
fuel-reprocessing cell
-
fused cell
-
galvanic cell
-
gamma-measuring cell
-
gas cell
-
graded bandgap solar cell
-
grating-type solar cell
-
group-technology cell
-
Hall cell
-
heteroface solar cell
-
heterojunction solar cell
-
high-bandgap solar cell
-
high-intensity solar cell
-
high-level cell
-
high-temperature fuel cell
-
hole matrix vertical junction solar cell
-
hole matrix vertical solar cell
-
homojunction solar cell
-
hot cell
-
humidity cell
-
hydraulic load cell
-
hydrogen cell
-
hydrogenerated amorphous silicon solar cell
-
indicator cell
-
induced-junction solar cell
-
integral diode solar cell
-
intermediate-level cell
-
inversion layer solar cell
-
junction solar cell
-
Kerr cell
-
lattice cell
-
lead-acid cell
-
lead cell
-
lead-zinc cell
-
Leclanche cell
-
library cell
-
light cell
-
light-sensitive cell
-
light-switching cell
-
liquid crystal cell
-
liquid junction solar cell
-
lithium counterdoped silicon solar cell
-
lithium-chlorine cell
-
lithium-sulfur cell
-
load cell
-
low-bandgap solar cell
-
low-level cell
-
machining cell
-
magnesium cell
-
manufacturing cell
-
master cell
-
matrix solar cell
-
mat-type cell
-
measuring cell
-
memory cell
-
mercury cell
-
minimum manned machining cell
-
monofacial solar cell
-
monolithic solar cell
-
multibandgap solar cell
-
multicolor solar cell
-
multielectrode cell
-
multijunction solar cell
-
multilayer solar cell
-
multilevel cell
-
multipass absorption cell
-
NC cell
-
neoprene fuel cell
-
new fuel storage cell
-
nickel-cadmium cell
-
nickel-iron cell
-
nickel-zinc cell
-
noise cell
-
nonideal solar cell
-
normal cell
-
one-device cell
-
optimum work cell
-
optoelectronic cell
-
oxidation-reduction cell
-
oxygen cell
-
oxygen-hydrogen cell
-
oxyhydrogen cell
-
painting cell
-
part washing cell
-
partially manned machining cell
-
parting cell
-
permeabilized cell
-
petite cell
-
photochemical cell
-
photoconducting cell
-
photoelectric cell
-
photoelectrochemical cell
-
photoelectrolytical cell
-
photoelectrolytic cell
-
photoemissive cell
-
photogalvanic cell
-
photomultiplier cell
-
photoresistance cell
-
photosensitive cell
-
photovoltaic cell
-
pickling cell
-
piezoelectric cell
-
pilot cell
-
p-i-n solar cell
-
planar solar cell
-
plunge cell
-
pneumatic cell
-
point contact solar cell
-
polycrystalline solar cell
-
pressure cell
-
primary cell
-
processing cell
-
pump cell
-
purification cell
-
radar-resolution cell
-
radar cell
-
radiation hardened solar cell
-
range-resolution cell
-
rechargeable cell
-
rectifying cell
-
reference solar cell
-
refining cell
-
refresh cell
-
regenerative fuel cell
-
regulator cell
-
resolution cell
-
resting cell
-
retreatment cell
-
ribbon solar cell
-
robotic work cell
-
robot work cell
-
robotic cell
-
robotic welding cell
-
rocking cell
-
roll cell
-
rotating anode cell
-
rotating cathode cell
-
Schottky-barrier solar cell
-
Schottky solar cell
-
sealed cell
-
sealed-in cell
-
seawater conductivity cell
-
secondary cell
-
selenium cell
-
self-adapting production cell
-
self-contained machining cell
-
self-refreshing cell
-
self-sufficient cell
-
semiconductor-electrolyte junction solar cell
-
semimanned machining cell
-
shadowed solar cell
-
sheet solar cell
-
sheet-pile cell
-
silicon solar cell
-
silo cell
-
silver-zinc cell
-
single manufacturing cell
-
single cell
-
single junction solar cell
-
single-crystalline solar cell
-
slot-type cell
-
solar cell
-
solid-electrolyte cell
-
solid-state cell
-
space solar cell
-
spherical solar cell
-
spinning cell
-
spray-deposited solar cell
-
stacked solar cell
-
standard cell
-
storage cell
-
surface-passivated solar cell
-
swarf removing cell
-
switching cell
-
tandem solar cell
-
thermal cell
-
thermal conductivity cell
-
thermoelectric solar cell
-
thermogalvanic cell
-
thin-film solar cell
-
transfer cell
-
tube cell
-
twisted nematic type cell
-
two-mirror absorption cell
-
ultrathin solar cell
-
unit cell
-
unmanned production cell
-
vertical junction solar cell
-
vertical solar cell
-
V-groove sofar cell
-
voltaic cell
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water cell
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wedged channel solar cell
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weighing cell
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welding cell
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Weston standard cell
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Weston cell
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wet cell
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work cell
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wraparound solar cell -
8 Land, Edwin Herbert
SUBJECT AREA: Photography, film and optics[br]b. 7 May 1909 Bridgeport, Connecticut, USAd. 1 March 1991 Cambridge, Massachusetts, USA[br]American scientist and inventor of the Polaroid instant-picture process.[br]Edwin Land's career began when, as a Harvard undergraduate in the late 1920s, he became interested in the possibility of developing a polarizing filter in the form of a thin sheet, to replace the crystal and stacked-glass devices then in use, which were expensive, cumbersome and limited in size. He succeeded in creating a material in which minute anisotropic iodine crystals were oriented in line, producing an efficient polarizer that was patented in 1929. After presenting the result of his researches in a Physics Department colloquium at Harvard, he left to form a partnership with George Wheelwright to manufacture the new material, which was seen to have applications as diverse as anti-glare car headlights, sunglasses, and viewing filters for stereoscopic photographs and films. In 1937 he founded the Polaroid Corporation and developed the Vectograph process, in which self-polarized photographic images could be printed, giving a stereoscopic image when viewed through polarizing viewers. Land's most significant invention, the instant picture, was stimulated by his three-year-old daughter. As he took a snapshot of her, she asked why she could not see the picture at once. He began to research the possibility, and on 21 February 1947 he demonstrated a system of one-step photography at a meeting of the Optical Society of America. Using the principle of diffusion transfer of the image, it produced a photograph in one minute. The Polaroid Land camera was launched on 26 November 1948. The original sepia-coloured images were soon replaced by black and white and, in 1963, by Polacolor instant colour film. The original peel-apart "wet" process was superseded in 1972 with the introduction of the SX-70 camera with dry picture units which developed in the light. The instant colour movie system Polavision, introduced in 1978, was less successful and was one of his few commercial failures.Land died in March 1991, after a career in which he had been honoured by countless scien-tific and academic bodies and had received the Medal of Freedom, the highest civilian honour in America.[br]Principal Honours and DistinctionsMedal of Freedom.BC
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