barrier

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barrier

1. 
a. an exposed offshore sand bar separated from the shore by a lagoon
b. (as modifier): a barrier beach
2. that part of the Antarctic icecap extending over the sea

Barrier

 

(in Russian, zaval), an antitank, antitransport, or anti-infantry obstacle. Barriers are made of lumber, stones, or snow on probable enemy routes of travel in places where it is difficult to bypass them. When setting up a timber barrier, trees of more than 20 cm in diameter are used. They are sawed down at a height of 60–120 cm and piled criss-cross with the crowns facing the enemy. In order to make it difficult to pull the barrier apart, the trees are not completely separated from their stumps; they are secured to them, woven with barbed wire, and also reinforced by the placement of land mines and high-explosive charges. During the Great Patriotic War of 1941–45 timber barriers were used extensively by Soviet troops on the defense in forested regions. Stone barriers are set up in mountains or in populated areas by demolishing cliffs or urban stone structures. Barriers made of snow can be devised in mountain and northern regions. In mining the Russian word zaval signifies the accidental destruction of a large rock mass in a mining excavation that disrupts its normal use.


Barrier

 

a lifting or sliding beam, usually installed at a railroad crossing to stop automobile, cart, and pedestrian traffic prior to the passing of a train. Barriers may be operated manually, mechanically, or automatically. Automatic barriers are operated by signals from the railroad’s automation and remote control systems; signal lights and acoustic devices may be used. The normal position for automatic barriers is the open position; for nonauto-matic barriers it is the closed position.

What does it mean when you dream about a barrier?

A barrier may signify that the dreamer is experiencing some obstacle in an arena of his or her life.

barrier

[′bar·ē·ər]
(ecology)
Any physical or biological factor that restricts the migration or free movement of individuals or populations.
(navigation)
Anything which obstructs or prevents passage of a craft.
(physics)

Barrier

[′bar·ē·ər]
(ordnance)
A passive acoustic detection system for submarines, consisting of hydrophones positioned on the ocean floor and connected by undersea cable to a land-based computer center.

barrier

1. Same as barricade.
2. According to the Architectural Barriers Act, any obstacle to the accessibility of a building by disabled people.

barrier

barrierclick for a larger image
i. As it relates to the sound barrier, it is a barrier to flight encountered by an airplane designed for subsonic speeds when it reaches transonic speeds and meets the turbulence incident of diverse degrees of compressibility. Intense buffet and loss of controls to a varying degree may be experienced at this speed.
ii. A net forming part of an arrester, or crash barrier system meant to arrest forward motion of an aircraft that is likely to overshoot the runway. Normally, the net lies horizontally on the ground and is raised when required. The vertical ropes of the barrier net are made of nylon, which are attached to the steel ropes at the top and the bottom of the barrier net.
References in periodicals archive ?
4) Knowledge regarding RTI/STI was evaluated; women were evaluated on the ability to name at least 2 symptoms of RTI/ STI, mode of spread of infection, prevention through barrier method of contraception, importance of perineal hygiene in prevention and possibility of maternal to child transmission.
Prescription-only barrier methods in the FDA guide include the diaphragm and the cervical cap, both used with spermicide.
Barrier methods are somewhat less effective, with behavioral methods being the least effective in preventing unintended pregnancies.
They say that the most common problem is that women skip use of a barrier method because it is unavailable or women find it too inconvenient.
A protective effect is considered possible because these barrier methods may block entry of pathogens to the cervix, which is the site of infection with gonorrhea and chlamydia and may be more susceptible than the vagina is to HIV infection.
The total utility value of each decision arm was calculated and sensitivity analyses were conducted using different rates of contraceptive failure for OC pills and barrier methods, and using different levels of stroke risk conveyed by OC pill use and smoking.
Condom failure or nonuse was common, and even though several women had previously been in situations that would dramatically increase their chances for condom failure or nonuse (intimate partner violence or substance use), a relatively high proportion felt secure using only barrier methods for contraception.
Diaphragms and caps: These are barrier methods of contraception.
Comparative contraceptive efficacy of the female condom and other barrier methods.
As mentioned, there is a risk that a human virus could have been introduced into smallpox vaccine seed or vaccine stocks during manufacturing, since barrier methods such as those currently used in all phases of vaccine production were not in place.
We need a campaign on STDs and barrier methods of contraception.
Filter life is longer than traditional barrier methods, due to the greater contaminant retention capacity by volume, as well as the filter's reusability.