A context-free grammar provides a simple and mathematically precise mechanism for describing the methods by which phrases in some natural language are built from smaller blocks, capturing the " block structure " of sentences in a natural way.

An example of a very simple mechanism that can be modeled by a state machine is a turnstile.

A simple prevention mechanism involves timestamping ( abbreviated to TS ), or checking the creation dates of the channels being merged.

The mechanism of capacitive switches is very simple, compared to mechanical ones.

The mechanism of the optical keyboard is very simple – a light beam is sent from the emitter to the receiving sensor, and the actuated key blocks, reflects, refracts or otherwise interacts with the beam, resulting in an identified key.

Like the other common Russian army pistol of this era, the Makarov, the Stechkin uses a simple unlocked blow-back mechanism and the double-action trigger.

A simple machine is an elementary device that has a specific movement ( often called a mechanism ), which can be combined with other devices and movements to form a machine.

This is simple and efficient ; however, there is no mechanism within the protocol to guarantee delivery.

One unusual design, the Olympus Pen half-frame 35 mm SLR system, manufactured by Olympus in Japan, used a rotary focal-plane shutter mechanism that was extremely simple and elegant in design.

Initially, two major types of fission bombs were built: a relatively simple device that uses uranium-235 and a more complicated mechanism that uses plutonium-239 derived from uranium-238.

UDP uses a simple transmission model with a minimum of protocol mechanism.

The claim that he drew a simple escapement mechanism, the first known in the West, is now questioned.

Chomsky has speculated that UG might be extremely simple and abstract, for example only a mechanism for combining symbols in a particular way, which he calls Merge.

This is an excellent illustration of an important mechanism of evolutionary development ; a simple homeotic gene change can result in a radically different phenotype.

This mechanism of water flow works because of water potential ( water flows from high to low potential ), and the rules of simple diffusion.

* Article 2: Whenever the Law imposes the death penalty, irrespective of the nature of the offence, the punishment shall be the same: decapitation, effected by means of a simple mechanism.

The persistence of geophagy within a family or community can also partially be explained by a simple mother / daughter sharing mechanism.

The basic idea is simple: turn a knob at the end of the pen, and a screw mechanism draws a piston up the barrel, sucking in ink.

Mechanical movements use an escapement mechanism to control and limit the unwinding and winding parts of a spring, converting what would otherwise be a simple unwinding into a controlled and periodic energy release.

Bacteria obtain their nutrients via simple diffusion process across their cell-membrane, as they lack the sophisticated nutrient uptake mechanism found in eukaryotes.

Even under relatively low power microscopy, the feeding mechanism can be observed, with immature young moving in the brood-pouch ; moreover, the eye being moved by the ciliary muscles can be seen, as well as blood corpuscles being pumped around the circulatory system by the simple heart.

However, DCC proved that high quality digital recording could be achieved with a cheap simple mechanism using stationary heads.

Gigerenzer instead proposes to examine simple alternatives to a full rationality analysis as a mechanism for decision-making, and he and his colleagues have shown that such simple heuristics frequently lead to better decisions than the theoretically optimal procedure.

The mechanism of action of these drugs has not been completely worked out, but certain of them appear to act by reducing the oxidised form of iodine before it can iodinate thyroglobulin ( Astwood, 1954 ).

These theoretical relationships are more clearly illustrated in Fig. 7 and their sum can be seen to correlate in form with practical measurements made with the Hesiometer as illustrated in the first portion of Fig. 5 for the cutting mechanism.

When a molten metal is mixed with another substance, there are two mechanisms that can cause an alloy to form, called atom exchange and the interstitial mechanism.

ATM traffic contracts form part of the mechanism by which " quality of service " ( QoS ) is ensured.

Dark energy in its simplest formulation takes the form of the cosmological constant term in Einstein's field equations of general relativity, but its composition and mechanism are unknown and, more generally, the details of its equation of state and relationship with the Standard Model of particle physics continue to be investigated both observationally and theoretically.

Some models used a " typebox " that was positioned, in the X-and Y-axes, by a mechanism and the selected letter form was struck by a hammer.

This mechanism of signal transduction is called a two-component system and is a common form of signal transduction in bacteria.

The mechanism of DNA ligase is to form two covalent phosphodiester bonds between 3 ' hydroxyl ends of one nucleotide, (" acceptor ") with the 5 ' phosphate end of another (" donor ").

Tax-credit scholarships which are in most part disbursed to current private school students or to families which made substantial donations to the scholarship fund, rather than to low-income students attempting to escape from failing schools, amount to nothing more than a mechanism to use public funds in the form of foregone taxes to support private, often religiously based, private schools.

On the other hand the Bohm interpretation of quantum mechanics keeps counter-factual definiteness while introducing a conjectured non-local mechanism in form of the ' quantum potential ', defined as one of the terms of the Schrödinger equation.

Japanese fascist Nakano Seigo advocated that Japan follow the Italian and German models, which were " a form of more democratic government going beyond democracy " which itself had " lost its spirit and decayed into a mechanism which insists only on numerical superiority without considering the essence of human beings.

Ferromagnetism is the basic mechanism by which certain materials ( such as iron ) form permanent magnets, or are attracted to magnets.

Numbers could be represented in the form of digits, automatically manipulated by a mechanical mechanism.

As a deist, he thought the mechanism allowed species to form varieties better adapted to particular conditions and was evidence of benevolent design in nature.

The metabolic process was identified in 1960s as catalysis by cytochrome P450 which produces reactive species that can interact with the DNA to form adducts, the mechanism by which the PAH adducts give rise to mutation however is still under investigation.

Some species form extraordinarily resilient spores, but for bacteria this is a mechanism for survival, not reproduction.

In Buddhism nirvana is preceded by bodhi, knowledge into the causal mechanism by which beings incarnate into material form and experience suffering.

A unique feature that may aid safety is that the fuel-balls actually form the core's mechanism, and are replaced one-by-one as they age.

Some astronomers believe the two types of star clusters form via the same basic mechanism, with the difference being that the conditions that allowed the formation of the very rich globular clusters containing hundreds of thousands of stars no longer prevail in the Milky Way.

PostScript Level 2 was introduced in 1991, and included several improvements: improved speed and reliability, support for in-RIP separations, image decompression ( for example, JPEG images could be rendered by a PostScript program ), support for composite fonts, and the form mechanism for caching reusable content.

Stalactites can also form in lava tubes, although the mechanism of formation is very different.

A proposed mechanism for maintaining the dust was a disk of coalesced bodies that were in the process of collapsing to form a planet.

The payment of weregild was an important legal mechanism in early Germanic society ; the other common form of legal reparation at this time was blood revenge.