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An example of this is the deployment of security personnel conducting checks for authorized entry at predetermined points of entry. This form of access control is usually supplemented by the earlier forms of access control (i.e. mechanical and electronic access control), or simple devices such as physical passes.
A natural barrier is a physical feature that protects or hinders travel through or over. Mountains , swamps , deserts and ice fields are among the clearest examples of natural barriers.
As physical obstacles, we can enumerate all those physical barriers that block the action and prevent the progress or the achievement of a concrete goal. Examples: architectural barriers that hinder access to people with reduced mobility; doors, gates, and access control systems, designed to keep intruders or attackers out;
The mountains, rivers, oceans, deserts, canyons and glaciers of the world have long provided a natural barrier to invasion and trade among competing cultures. India's isolation from the rest of Asia via the Himalayas is a prime example. [6] The English Channel proved invaluable in World War II as a deterrent to Nazi aggression. [7]
A safety barrier is a component which prevents passage into a dangerous area, and is commonly used to mitigate risk. Description A safety barrier is a component which ...
It reduces erosion on the other, i.e. downdrift, side by reducing the speed and power of the waves striking the shore. It is a physical barrier to stop sediment transport in the direction of longshore drift (also called longshore transport). If a groyne is correctly designed, then the amount of material it can hold will be limited, and excess ...
A border barrier, border fence or border wall is a separation barrier that runs along or near an international border. Such barriers are typically constructed for border control purposes such as curbing illegal immigration , human trafficking , and smuggling .
The types of barriers that can cause this isolation include: different habitats, physical barriers, and a difference in the time of sexual maturity or flowering. [6] [7] An example of the ecological or habitat differences that impede the meeting of potential pairs occurs in two fish species of the family Gasterosteidae (sticklebacks).