" Significant amounts " of hexavalent chromium were found in the water of more than 40 homes in the area, some of which have now been fitted with state-monitored filters on their water supply.

They also contained tables of values showing how to implement such filters as RLC ladders-very useful when amplifying elements were expensive compared to passive components.

A 100 mm aperture reflecting telescope collected light and directed it to a series of filters, and, from there, measurements were performed by the detectors of the PPR.

Rouben Mamoulian's Dr. Jekyll and Mr. Hyde ( Paramount, 1931 ), remembered for its use of color filters to create Jekyll's transformation before the camera, Michael Curtiz's Mystery of the Wax Museum ( Warner Brothers, 1933 ), and Island of Lost Souls ( Paramount, 1932 ) were all important horror films.

If the example filters were required to match the case of the attribute value, an extensible match filter must be used, for example,

The camera sequence started at 00: 18: 36 UT on July 15 ( 7: 18: 49 p. m. EST on July 14 ) and 21 pictures using alternate red and green filters, plus 21 lines of a 22nd picture were taken.

Traditional desktop spectrum analyzers were of little use for this job, as they sampled frequencies using banks of analog filters and so were restricted in the number of channels they could acquire.

In the 1920s, commercial IF filters looked very similar to 1920s audio interstage coupling transformers, had very similar construction and were wired up in an almost identical manner, and so they were referred to as " IF Transformers ".

In 1892 Dimitri Ivanovski showed that a disease of tobacco plants, tobacco mosaic disease, could be transmitted by extracts that were passed through filters fine enough to exclude even the smallest known bacteria.

Starting in the early 1980s, water-blown microcellular flexible foams were used to mold gaskets for panel and radial seal air filters in the automotive industry.

There were several problems with these engines, including water and corrosion in the injectors ( no water separator in the fuel line ), paraffin clogging of fuel lines and filters in cold weather, reduced lubrication in the heads due to undersized oil galleys, head bolt failures, and the use of aluminum rockers and stanchions in the 4. 3L engines.

Since the first digital backs were introduced, there have been three main methods of capturing the image, each based on the hardware configuration of the sensor and color filters.

Electronic devices such as oscillators, echoes, filters and alarm clocks were an integral part of free improvisation performances by groups such as Kluster at the underground scene at Zodiac Club in Berlin in the late 1960s.

a large installed base remained and a large variety of connectors, adapters and equipment such as ADSL filters were still in production and readily available.

Military binoculars of the Cold War era were sometimes fitted with passive sensors that detected active IR emissions, while modern ones usually are fitted with filters blocking laser beams used as weapons.

Workers were cleaning a blockage in one of the eight condensate polishers ( sophisticated filters cleaning the secondary loop water ), when, for reasons still unknown, the pumps feeding the polishers stopped.

In order to distinguish between the two perceptions, objects seen by O were shot through a lens-gauze, blurring his perception while E's perception was shot without gauze or filters, keeping the images sharp.

URI DNSBLs were created when it was determined that much spam made it past spam filters during that short time frame between the first use of a spam-sending IP address and the point where that sending IP address was first listed on major sending-IP-based DNSBLs.

The earliest type of light meters were called extinction meters and contained a numbered or lettered row of neutral density filters of increasing density.

The tank's availability was excellent and the problems that were identified during the large Saif Sareea II exercise, which took place eighteen months earlier, were solved by the issuing of Urgent Operational Requirements for equipment such as sand filters.

To avoid false triggering of touch-tones by the prompts ( due to input / output cross talk ), notch filters were created to remove the touch tone frequencies from the prompts.

MIT hackers also used the PDP-1 for playing music in four-part harmony, using some special hardware — four flip-flops directly controlled by the processor ( the audio signal was filtered with simple RC filters ).

The overall loop response is controlled by the two individual low-pass filters that precede the third phase detector while the third low-pass filter serves a trivial role in terms of gain and phase margin.

The loop characteristics can be controlled by inserting different types of loop filters.

Electronically controlled birefringent devices are used in combination with polarizing filters as modulators in fiber optics.

The paper used for fuel filters is a crêped paper with controlled porosity, which is pleated and wound to cartridges.

The LEDs can produce millions of different colours and be controlled from a laptop, compared to the previous method of manually installing filters to change light colours.

* a set of filters ( one for each band ), all taking as input the same source ( the source selected by the switch ), along with amplifiers whose gain was controlled by the band amplitude signals.

Photographic filters do not need the accurately controlled optical properties and precisely defined transmission curves of filters designed for scientific work, and sell in larger quantities at correspondingly lower prices than many laboratory filters.

Dichroic filters are particularly suited for precise scientific work, since their exact colour range can be controlled by the thickness and sequence of the coatings.

It was also the first HVDC scheme to be equipped with self-tuning harmonic filters and to be controlled with a " Phase Locked Oscillator ", a principle which subsequently became standard on all HVDC systems ..

A footpedal controlled the volume ratio of the output of the two filters, which was sent to an amplifier.

; aspiration: two air filters, two hot-film air mass meters, two cast alloy throttle bodies each with electronically controlled ' drive by wire ' throttle butterfly valves, cast magnesium alloy variable geometry and resonance intake manifold

; aspiration, fuel system & ignition system — 6. 2 & 6. 5: two air filters, four cast alloy throttle bodies each with Magneti Marelli electronically controlled ' drive by wire ' throttle butterfly valves, cast magnesium alloy intake manifold ; two linked common rail fuel distributor rails, electronic sequential multi-point indirect fuel injection with intake manifold-sited fuel injectors ; centrally positioned spark plugs, mapped direct ignition with 12 individual direct-acting single spark coils

* 1987 Computer controlled audio mixing console CCM with computer controlled faders ( VCAs ) and filters ( VCFs ), interface and software for Commodore 64 and Atari ST

There are problems with noise introduced by the conversions, but these can be controlled and limited for many useful filters.

These modules offered unprecedented control over creating sounds by allowing a user to modify primary sound waveforms ( sine waves, square waves and other waveforms provided by voltage controlled oscillators or VCO ) with amplitude modulators ( voltage controlled amplifiers or VCA ) and spectral modulators ( voltage controlled filters ( VCF ) or fixed filter banks ) and other modifiers.

Each voice card features a voltage controlled oscillator with multiple waveforms, 2-pole high-pass and low-pass voltage controlled filters, and two envelope generators for filter modulation and VCA control.

The noise filters are controlled by signals derived from bandpass filters, not from a correlation process.

Three different wavelengths of ultraviolet radiation are selected by the variable filters placed in front of the three mercury xenon lights which serve as the ultraviolet sources.

Other bilinear transforms can be used to warp the frequency response of any discrete-time linear system ( for example to approximate the non-linear frequency resolution of the human auditory system ) and are implementable in the discrete domain by replacing a system's unit delays with first order all-pass filters.

The use of Internet filters or content-control software varies widely in public libraries in the United States, since Internet use policies are established by the local library board.

Some libraries use Internet filters on computers used by children only.

Like CIPA, the law requires libraries to disable filters for an adult library user when requested to do so by the user.

Google services are often blocked by filters, but these may most often be bypassed by using https :// in place of http :// since content filtering software is not able to interpret content under secure connections ( in this case SSL ).

Packet inspection filters do not initially interfere with the connection to the server but inspect the data in the connection as it goes past, at some point the filter may decide that the connection is to be filtered and it will then disconnect it by injecting a TCP-Reset or similar faked packet.

Very different mathematical treatments apply to the design of filters termed infinite impulse response ( IIR ) filters, characteristic of mechanical and analog electronics systems, and finite impulse response ( FIR ) filters, which can be implemented by discrete time systems such as computers ( then termed digital signal processing ).

The second equation is a discrete-time version used, for example, by digital filters implemented in software, so-called digital signal processing.

Classical analog filters are IIR filters, and classical filter theory centers on the determination of transfer functions given by low order rational functions, which can be synthesized using the same small number of reactive components.

LTI filters can be completely described by their frequency response and phase response, the specification of which uniquely defines their impulse response, and vice versa.

Continuous-time LTI filters may also be described in terms of the Laplace transform of their impulse response, which allows all of the characteristics of the filter to be analyzed by considering the pattern of poles and zeros of their Laplace transform in the complex plane.

FIR digital filters may be implemented by the direct convolution of the desired impulse response with the input signal.

All low-pass second-order continuous-time filters have a transfer function given by

Here amongst the intentionally " poetic " uses of vignettes and filters and literary intertitles, a shot of the empty path once trod by the lovers is used to evoke the past.

Color temperature issues such as these can be compensated for by other factors such as lens filters and color gels placed in front of the lights.

Some have one or two filters attached to the face piece ; others have a large filter connected to the face piece by a hose.

With actual liquid crystal between the polarizing filters, light passing through the first filter would be blocked by the second ( crossed ) polarizer.

The illumination measured by a photocell sensor does not necessarily correspond to what is perceived by the human eye, and without filters which may be costly, photocells and charge-coupled devices ( CCD ) tend to respond to some infrared, ultraviolet or both.