For the simple case where the direction of the light beam along the line SE is perpendicular to the motion of the observer then only light emitted at an angle equal to the arc cosine of the ratio of the observer's speed to the speed of light will reach the telescope.

Miguel Alcubierre theorized that it would be possible to create an Alcubierre drive, in which a ship would be enclosed in a " warp bubble " where the space at the front of the bubble is rapidly contracting and the space at the back is rapidly expanding, with the result that the bubble can reach a distant destination much faster than a light beam moving outside the bubble, but without objects inside the bubble locally traveling faster than light.

* close reach ( between close hauled and a beam reach )

* beam reach ( approximately 90 ° to the wind )

* broad reach ( between a beam reach and running )

The sail trim on a boat is relative to the point of sail one is on: on a beam reach sails are mostly let out, on a run sails are all the way out, and close hauled sails are pulled in very tightly.

A balanced-reinforced beam is one in which both the compressive and tensile zones reach yielding at the same imposed load on the beam, and the concrete will crush and the tensile steel will yield at the same time.

DeKalb budget shows county is on beam

At the entrance side of the shelter, each roof beam is rested on the inside 4 inches of the block wall.

Hotei is 23 feet long with an 8-1/2-foot beam and every inch a family boat.

The frequency used for these experiments is 15 mc. and the transducer is a specially cut crystal with an epoxy lens capable of providing beam diameters smaller than one millimeter.

The transducer itself moves the beam in a sector scan, just like a radar antenna, while the entire transducer structure is moved over a 90-degree arc in front of the eye to `` look into '' all corners.

The ratio of the measured antenna temperature change during a drift scan across the moon to the average brightness temperature of the moon over the antenna beam ( assuming that the brightness temperature of the sky is negligible ) was found, by graphical integration of the antenna directivity diagram, to be 0.85.

The measured brightness temperature is a good approximation to the brightness temperature at the center of the lunar disk because of the narrow antenna beam and because the temperature distribution over the central portion of the moon's disk is nearly uniform.

The sighting procedure includes the use of a fixture for the transit to project a beam of light, which is darkened by crossed hairs, on the accelerometer mirror.

As this direction is random, the beam could be expected to spread into a line.

The device uses a magnet to bend the trajectory of a beam of ions, and the amount of deflection is determined by the ratio of an atom's mass to its charge.

Synthetic amethyst is produced by gamma-ray, x-ray or electron beam irradiation of clear quartz which has been first doped with ferric impurities.

At the end of each line the beam returns to the start of the next line ; the end of the last line is a link that returns to the top of the screen.

As it passes each point the intensity of the beam is varied, varying the luminance of that point.

The test is unstable ( i. e. the crack propagates along the entire specimen once a critical load is attained ) and a modified version of this test characterised by a non constant inertia was proposed called the tapered double cantilever beam ( TDCB ) specimen.

At the instant of any observation of an object, the apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light ( i. e., the line actually taken by the light on its path to the observer ).

Another way to state this is that the emitting object may have a transverse velocity with respect to the observer, but any light beam emitted from it which reaches the observer, cannot, for it must have been previously emitted in such a direction that its transverse component has been " corrected " for.

According to the special theory of relativity, the aberration looks as a transform of the celestial sphere due to different frames of reference and is virtually a special case of velocity addition, namely one of the light beam and frames ' relative velocity v. The formula from relativistic aberration can be simplified to

Laser Doppler anemometers use a beam of light from a laser that is divided into two beams, with one propagated out of the anemometer.

Particulates ( or deliberately introduced seed material ) flowing along with air molecules near where the beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam.

The vertical force on the bridge becomes a shear and flexural load on the beam which is transferred down its length to the substructures on either side They are typically made of steel, concrete or wood.

Very recently, observations have been made at 8-mm wave length with a reflector 22 meters in diameter with a resultant beam width of only about 2' ( Amenitskii, Noskova, and Salomonovich, 1960 ).

* Mixed-mode delaminating beam tests ( MMDB ) consist in a bonded bilayer with two starting cracks loaded on four points.

Such a beam must come " straight " to the observer along a line which connects the observer with the position of the object when it emitted the light.

The samples used in atom probe are usually a metallic or semi-conducting material, with the needle geometry produced by electropolishing, or focused ion beam methods.

The world's longest beam bridge is Lake Pontchartrain Causeway in southern Louisiana in the United States, at, with individual spans of.

The team at Dubna studied this reaction in 1976 in order to assist in their assignments of the SF activities from their experiments with a < sup > 54 </ sup > Cr beam.

Patients expected to receive external beam radiation as part of their adjuvant treatment are also commonly considered for delayed autologous reconstruction due to significantly higher complication rates with tissue expander-implant techniques in those patients.

As with digital photocopiers and multifunction printers ( MFPs ), laser printers employ a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor.

* The episode " The Stones of Blood ", of the 16th season of Doctor Who, the Fourth Doctor encounters the Ogri, a silicon-based life form, and in the same sub-plot, the Megara, who are made entirely out of an unknown substance, possibly energy, and they uphold the word of the law, and execute all who break the law with a beam of energy.

* 6LF6 beam power tetrode with anode cap

Paradoxically, it is possible to reduce the divergence of a laser beam by first expanding it with one convex lens, and then collimating it with a second convex lens whose focal point is coincident with that of the first lens.

It is a result of the superpostion of many waves with different phases, which are produced when a laser beam illuminates a rough surface.

This welding technique must be performed in a vacuum, so that the electron beam does not interact with the gas prior to reaching the target, and it can be used to join conductive materials that would otherwise be considered unsuitable for welding.

Low-energy electron diffraction ( LEED ) is a method of bombarding a crystalline material with a collimated beam of electrons, then observing the resulting diffraction patterns to determine the structure of the material.