A red filter, Zeiss barrier filter with the code ( Schott ) designation BG 23, was also used in the ocular lens assembly as it improved the contrast between specific and nonspecific fluorescence.

This recommendation was based on the fact that the hymen was not the only barrier to smooth consummation of the sex act.

Her permanent titanium shell was recessed behind an even more indestructible barrier in the central shaft of the scout ship.

Image showing shock waves from NASA's X-43A hypersonic research vehicle in flight at Mach 7, generated using a computational fluid dynamics algorithm. On September 30, 1935 an exclusive conference was held in Rome with the topic of high velocity flight and the possibility of breaking the sound barrier.

The sound barrier was broken using the Bell X-1 aircraft twelve years later, thanks in part to those individuals.

By the time the sound barrier was broken, much of the subsonic and low supersonic aerodynamics knowledge had matured.

The sea was a communication medium rather than a barrier

As well as industrial uses, the Royal Military Canal on the Romney Marsh was built so as create a barrier against invading troops, and hiding places for British troops during the Napoleonic Wars.

This design philosophy was decided on to lower the cost of building devices, and in turn lower the entry barrier to becoming familiar with chorded keyboards.

Under Veeck's leadership, one of Cleveland's most significant achievements was breaking the color barrier in the American League by signing Larry Doby, formerly a player for the Negro League's Newark Eagles in, eleven weeks after Jackie Robinson signed with the Dodgers.

The Teutonic Order's strategy was to move down the Vistula and secure the delta, establishing a barrier between the Prussians and Danzig ( Present day Gdańsk ).

When the tide came in water was allowed to flow in behind a barrier.

The sound barrier was broken, and after a few false starts due to required changes in controls, speeds quickly reached Mach 2 — past which aircraft can't maneuver to avoid attack.

Nevertheless, these fighters could only achieve modest increases in top speed due to problems of compressibility created as aircraft and their propellers approached the sound barrier, and it was apparent that propeller-driven aircraft were approaching the limits of their performance.

There was a huge language barrier as Japanese was unlike other languages the missionaries had previously encountered.

The barrier was largely torn down by Palestinians at the beginning of the Al-Aqsa Intifada in September 2000 .< ref name =" Doron Almog ">

He considered trying to resume his career as a goalkeeper but even he had to accept that the loss of binocular vision was an obvious barrier to maintaining his goalkeeping livelihood, and announced his retirement from playing on 8 August 1973.

However, the compositional style employed in the opera, with few stand-alone arias, was criticized at the time and remains a barrier to the opera's complete acceptance into the standard repertoire.

The most prominent frontier barrier was the Berlin Wall, constructed in 1961, which finally closed the loop hole in the East German border between East Berlin and West Berlin.

He was underlining the support of the United States for West Germany 22 months after the Soviet-supported East Germany erected the Berlin Wall as a barrier to prevent movement between East and West.

It also shows the extent to which an Irish man was interrogated by British Police and how he failed to be able to answer their questions due to a language barrier.

To overcome the political barrier of nationalism, Lenin said it was necessary to acknowledge the existence of nationalism among oppressed peoples, and to guarantee their national independence, as the right of secession ; and that, based upon national self-determination, it was natural for socialist states to transcend nationalism and form a federation.

The word derives from the old Norse " gata ", meaning road or path, and originally referred to the gap in the wall or fence, rather than the barrier which closed it.

It was shown, in fungi that undergo closed mitosis ( where the nucleus does not degrade ), that the change of the permeability barrier of the NE was due to changes within the NPC and is what allows the entry of mitotic regulators.

The gates remain closed until the tide downstream of the barrier falls to the same level as the water level upstream.

In periods when the river is in flood upstream, if the gates are closed shortly after low tide, a huge empty volume is created behind the barrier which can act as a reservoir to hold the floodwater coming over Teddington weir.

Most river floods will not fill this volume in the few hours of the high tide cycle during which the barrier needs to be closed.

The barrier was closed twice on 9 November 2007 after a storm surge in the North Sea which was compared to the one in 1953.

On 20 August 1989, hours after the Marchioness disaster, the barrier was closed against a spring tide for 16 hours " to assist the diving and salvage operations ".

Three systems of toll roads exist: open ( with mainline barrier toll plazas ); closed ( with entry / exit tolls ) and open road ( no toll booths, only electronic toll collection gantries at entrances and exits, or at strategic locations on the mainline of the road ).

However, the barrier beach with its sand dunes eventually closed this opening permanently.

GERD is usually caused by changes in the barrier between the stomach and the esophagus, including abnormal relaxation of the lower esophageal sphincter, which normally holds the top of the stomach closed ; impaired expulsion of gastric reflux from the esophagus, or a hiatal hernia.

Once they are closed, most of the brain is inaccessible to ultrasound imaging, because the bony skull presents an acoustic barrier.

A bigger barrier is needed in the complex plane, to prevent any closed contour from completely encircling the branch point z

The visitors ' gallery was closed until a glass barrier could be installed, to prevent similar incidents.

A closed collection system has a barrier or diaphragm that separates the pump tubing from the horn.

The barrier in a closed collection system breast pump is marketed as preventing outside air from contaminating the expressed breastmilk in the collection bottle, which preserves the milk ’ s purity.

As a checkpoint is something that can be either closed, functioning as a barrier, or open, functioning as an entry point, this title may be taken to have a double meaning: does " without a gate " mean that the barrier has no gateway through which to pass, or does it mean that the passage has no gate to block it?

The highway continues north through the river valley toward Harriman, where it encounters the Woodbury toll barrier, the southeastern end of the mainline's major closed ticket system.

It meets NY 78 at exit 49 near Depew before passing through the Williamsville toll barrier, the northwestern end of the major closed ticket system.

Just southwest of exit 55, I-90 and the Thruway pass through the Lackawanna toll barrier, which serves as the northeast end of the minor closed ticket system.

The Thruway continues alongside US 20 past Dunkirk and Westfield to the Ripley toll barrier, the southwestern end of the minor closed ticket system just northeast of exit 61 for Shortman Road.

A road called Freedom Way goes through the center and serves as a barrier between the area closed to the public to its west and the area that is open to the public to its east, with its many bike paths, walkways, and fields.

The original span was closed down for fifteen months for refurbishment — the suspenders were replaced, the deck and median barrier were removed and replaced with a single deck to allow four undivided lanes of traffic.