Throughout the 1800s breech-loading bolt-actions continued to develop following a steady progression, seeing widespread adoption and continual improvements in design. WWI marked the height of the type's use though automatic loading designs were starting to be used. During and after World War II, the military bolt-action rifle was superseded with the semi-automatic rifle and later assault rifles. However, the bolt-action is still common among sniper rifles, as snipers value the design's potential for superior accuracy, reliability, les ...

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Bolt action, Bolt action - Mechanics, Bolt action - Loading, Bolt action - History

Read more here: » Bolt action: Encyclopedia II - Bolt action - History

Definition and meaning of action potential:

action potential - the electrical signal which rapidly propagates along the membrane of the axon of nerve cells, as well as over the surface of some muscle and glandular cells. It is caused by change in membrane electrical potential, the underlying cause of which is a change in flow of ions across the membrane due to voltage-activated ion channels. It leads to an all-or-nothing action current, the nervous impulse

(Source: US National Oceanic and Atmospheric Administration (NOAA) )

Also see these pages: Oceanography, Oceanography Sitemap, Coral Reef, Environment, Sustainability, Climate Change,

For more dictionary entries, see » Action Dictionary

Definition and meaning of capillary action:

capillary action - the means by which liquid moves through the porous spaces in a solid, such as soil, plant roots, and capillary blood vessels due to the forces of adhesion, cohesion, and surface tension. Capillary action is essential in carrying substances and nutrients from one place to another in plants and animals

(Source: US National Oceanic and Atmospheric Administration (NOAA) )

Also see these pages: Oceanography, Oceanography Sitemap, Coral Reef, Environment, Sustainability, Climate Change,

For more dictionary entries, see » Action Dictionary

Typically, the bolt consists of a tube of metal inside of which the firing mechanism is housed, and which has at the front or rear of the tube several metal knobs, or "lugs", which serve to lock the bolt in place. The operation can be done via a rotating bolt, a lever, or a number of systems. For example, one setup is a straight-pull design that use a rotating bolt, such as the German Blaser R93 rifle. Straight pull designs have seen a great deal of use, though manual turn-bolt designs are what most commonly thought of in reference to a bolt ...

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Bolt action, Bolt action - Mechanics, Bolt action - Loading, Bolt action - History

Read more here: » Bolt action: Encyclopedia II - Bolt action - Mechanics

Chan's clowning may have helped extend the life of the kung fu wave. For all that, he had become a star towards the end of the boom, and would soon help move the colony towards a new type of action. In the 1980s, he and many colleagues would forge a slicker, more spectacular Hong Kong pop cinema that would successfully compete with the post-Star Wars summer blockbusters from America. Hong ...

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Hong Kong action cinema, Hong Kong action cinema - The kung fu wave, Hong Kong action cinema - Bruce Lee, Hong Kong action cinema - The Post Bruce Lee Void, Hong Kong action cinema - Jackie Chan and the kung fu comedy, Hong Kong action cinema - Reinventing Action Cinema, Hong Kong action cinema - Jackie Chan and the modern kung fu film, Hong Kong action cinema - Tsui Hark and Cinema City, Hong Kong action cinema - John Woo and the gangster film, Hong Kong action cinema - The wire fu wave, Hong Kong action cinema - Influence in the West, Hong Kong action cinema - Exit of many Leading Figures

Read more here: » Hong Kong action cinema: Encyclopedia II - Hong Kong action cinema - Reinventing Action Cinema

Newton's laws of motion can be stated in various ways. One of them is the Lagrangian formalism, also called Lagrangian mechanics. If we denote the trajectory of a particle as a function of time t as x(t), with a velocity x′(t), then the Lagrangian is a function dependent on these quantities and possibly also explicitly on time: The action integral S is the integral of the Lagrangian over time between a given starting point x(t1) at time t1 and a given end point xSee also:

Action physics, Action physics - Some applications of the action principle, Action physics - History, Action physics - Action principle in classical mechanics, Action physics - Euler-Lagrange equations for the action integral, Action physics - Example: Free particle in polar coordinates, Action physics - Einstein-Hilbert action, Action physics - Literature

Read more here: » Action physics: Encyclopedia II - Action physics - Action principle in classical mechanics

All actions of the hormone are inhibitory. Somatostatin's main actions are: inhibits the release of growth hormone (GH) inhibits the release of thyroid stimulating hormone (TSH) suppresses the release of gastrointestinal hormones gastrin cholecystokinin (CCK) secretin motilin vasoactive intestinal peptide (VIP) gastric inhibitory polypeptide (GIP) enteroglucagon (GIP) prolongs gastric emptying, gall bladder contraction and ...

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Somatostatin, Somatostatin - Actions, Somatostatin - Synthetic substitutes

Read more here: » Somatostatin: Encyclopedia II - Somatostatin - Actions

Consider a group G acting on a set X. The orbit of a point x in X is the set of elements of X to which x can be moved by the elements of G. The orbit of x is denoted by Gx: The defining properties of a group guarantee that the set of orbits of X under the action of G form a partition of X. The associated equivalence relation is defined by saying x ~ y iff there exists a g in G with g·x< ...

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Group action, Group action - Definition, Group action - Examples, Group action - Types of actions, Group action - Orbits and stabilizers, Group action - Morphisms and isomorphisms between G-sets, Group action - Continuous group actions, Group action - Strongly continuous group action and smooth vector, Group action - Generalizations

Read more here: » Group action: Encyclopedia II - Group action - Orbits and stabilizers

Although the passive transmission of action potentials across myelinated segments would suggest that action potentials propagate in either direction, most action potentials travel unidirectionally because the node behind the propagating action potential is refractory. Where membrane has undergone an action potential, a refractory period follows. This period arises primarily because of the voltage-dependent inactivation of sodium channels, as described by Hodgkin and Huxley in 1952. In addition to the voltage-dependent opening o ...

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Action potential, Action potential - Overview, Action potential - Underlying mechanism, Action potential - Resting membrane potential, Action potential - Action potential phases, Action potential - Threshold and initiation, Action potential - Circuit model, Action potential - Propagation, Action potential - Speed of propagation, Action potential - Saltatory conduction, Action potential - Refractory period, Action potential - Why an action potential?

Read more here: » Action potential: Encyclopedia II - Action potential - Refractory period

The basic principle of Lagrangian mechanics is that an object subjected to outside influences will "choose" a path which makes a certain quantity, the action, a minimum. The action is a functional, a mathematical relationship which takes an entire path and produces a single number. The physical path, that which the object actually follows, is the path for which the action is "stationary": any small variation of the path from the physical one does not significantly change the action. (Often, this is equivalent to saying the phys ...

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Nambu-Goto action, Nambu-Goto action - Derivation, Nambu-Goto action - Reference

Read more here: » Nambu-Goto action: Encyclopedia II - Nambu-Goto action - Derivation

Action potential - Resting membrane potential. The membrane voltage changes that take place during an action potential result from changes in the permeability of the membrane to specific ions (particularly sodium and potassium), the internal and external concentrations of which cells maintain in an imbalance. This imbalance makes possible not only action potentials but also the resting cell potential arises through the work of pumps (eg, the sodium-potassium exchanger) as well as ion channels (eg, the potassium l ...

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Action potential, Action potential - Overview, Action potential - Underlying mechanism, Action potential - Resting membrane potential, Action potential - Action potential phases, Action potential - Threshold and initiation, Action potential - Circuit model, Action potential - Propagation, Action potential - Speed of propagation, Action potential - Saltatory conduction, Action potential - Refractory period, Action potential - Why an action potential?

Read more here: » Action potential: Encyclopedia II - Action potential - Underlying mechanism

It is essential for the understanding of this movement to place it in historical context. A product of the post-war artistic insurgence, it developed in an era where quantum mechanics and psychoanalysis were beginning to flourish and change the entire Western civilization’s understating of the world and self-consciousness. The preceding art of Kandinsky and Mondrian, had attempted to detract itself from the portrayal of objects and instead tried to tingle and tantalize the emotions of the viewer. Action Art took this a step further, ...

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Action painting, Action painting - Historical context, Action painting - The unconscious act, Action painting - Action painters

Read more here: » Action painting: Encyclopedia II - Action painting - Historical context

This spontaneous activity was the "action" of the painter. The painter would let the paint drip onto canvases, often simply dancing around, or even standing on the canvases, and simply letting the paint fall where the subconscious mind wills, thus letting the unconscious part of the psyche express itself. All this, however, is nothing we can explain or interpret, because it is only an unconscious manifestation. Source: based (very) loo ...

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Action painting, Action painting - Historical context, Action painting - The unconscious act, Action painting - Action painters

Read more here: » Action painting: Encyclopedia II - Action painting - The unconscious act

Treatise on Actions and their Rewards (T'ai-shang Kan-ying P'ien): 10th century text of Religious Taoism which maintains that people lose longevity in proportion to their evil deeds.

 (See also: Treatise on Actions and their Rewards, Eastern Philosophy, Body Mind and Soul)

Action potentials are triggered when an initial depolarization reaches threshold. This threshold potential varies, but generally is about 15 millivolts above the cell's resting membrane potential, occurring when the inward sodium current exceeds the outward potassium current. The net influx of positive charges carried by sodium ions depolarizes the membrane potential, leading to the further opening of voltage-gated sodium channels. These channels support greater inward current causing further depolarization, creating a positive-feedback cycle th ...

See also:

Action potential, Action potential - Overview, Action potential - Underlying mechanism, Action potential - Resting membrane potential, Action potential - Action potential phases, Action potential - Threshold and initiation, Action potential - Circuit model, Action potential - Propagation, Action potential - Speed of propagation, Action potential - Saltatory conduction, Action potential - Refractory period, Action potential - Why an action potential?

Read more here: » Action potential: Encyclopedia II - Action potential - Threshold and initiation