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gas barrier

A device or air flow that can divert the flow of gases in a controlled solid waste site.

gas barrier

gas barrier   Quick reference

A Dictionary of Public Health (2 ed.)

Reference type:
Subject Reference
Current Version:
2018

...gas barrier A device or air flow that can divert the flow of gases in a controlled solid waste site. ...

gas barrier

gas barrier  

A device or air flow that can divert the flow of gases in a controlled solid waste site.
market barrier

market barrier  

In economics, any factor or condition that prevents or inhibits market equilibrium. As applied to air pollution control, for example, this includes policy and legal frameworks that prevent the ...
contestable market

contestable market  

Reference type:
Overview Page
A market that has very low barriers to entry and exit; in a perfectly contestable market entry and exit are costless. In such a market potential as well as actual competition is a constraint on what ...
free diffusion

free diffusion  

Diffusion in a gas phase or across a boundary between two solutions (or between a solution and pure solvent), as distinct from diffusion across a membrane or some other porous barrier.[...]
Australia

Australia  

Reference type:
Overview Page
Subject:
History
Australia has been establishing stronger links with Asia—but has been unable to shake off the British monarchyAustralia's landmass—which can be viewed as the world's largest island—is dominated by a ...
thermal barrier

thermal barrier   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...thermal barrier ( thermal barrier coating ) 1. A coating, consisting of a metallic bond coat, an oxide layer, and a ceramic top layer, applied to metallic surfaces, such as gas-turbine parts, to insulate them from large and prolonged heat loads. 2. ( fire barrier ) An insulating coating applied over polyurethane foam to reduce the rate of heat transfer during a...

free diffusion

free diffusion   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
33 words

...diffusion diffusion in a gas phase or across a boundary between two solutions (or between a solution and pure solvent), as distinct from diffusion across a membrane or some other porous barrier...

permeability

permeability   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
42 words

...1. A property of a membrane or other barrier, being the ease with which a substance will diffuse or pass across it. 2. The ease with which gases, liquids, or plant roots penetrate into or pass through a layer of...

contestable market

contestable market   Quick reference

A Dictionary of Economics (5 ed.)

Reference type:
Subject Reference
Current Version:
2017
Subject:
Social sciences, Economics
Length:
92 words

...contestable market A market that has very low barriers to entry and exit; in a perfectly contestable market entry and exit are costless. In such a market potential as well as actual competition is a constraint on what the incumbent producers can charge, so that a competitive price is observed even when there is only one seller. Examples of highly contestable markets include low-cost airlines, internet service providers, electricity and gas suppliers, etc. In practice the existence of at least some sunk costs means that no markets are perfectly...

blood alcohol

blood alcohol   Quick reference

A Dictionary of Forensic Science

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Law
Length:
159 words

... that crosses the blood brain barrier, causing behavioural changes and impaired motor skills. Anyone with a BAC level greater than the legal limit is considered to be legally intoxicated. The blood alcohol test is considered an evidentiary test, meaning the results can be used as evidence in a prosecution; in contrast, field tests produce approximate results only and are used only to determine if a BAC test should be performed. In the laboratory, BAC levels in blood are usually determined using a headspace method coupled to gas chromatography (GC) with a ...

landfill techniques

landfill techniques   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Earth Sciences and Geography
Length:
2,121 words
Illustration(s):
3

...geosynthetic fabric or ‘geofabric’. A geofabric allows liquids and gases to pass across its thickness without letting the fine-size material fill up the pores in the gravel layer. The drainage layer minimizes ponding of water over the moisture-barrier layer by facilitating lateral flow of water towards drainpipes within and at the periphery of the cover liner. Reducing the height and duration of water ponding over the moisture-barrier layer reduces leakage of water through the moisture-barrier layer to the landfilled waste. The drainage layer consists of...

sous vide

sous vide   Quick reference

A Dictionary of Travel and Tourism

Reference type:
Subject Reference
Current Version:
2012
Subject:
Social sciences
Length:
234 words

...gas packaging followed by cook-and-chill method of meal preparation. Cook-and-chill involves cooking meals, rapid chilling within 90 minutes to 0°C–3°C, storage at 3°C, (32°–37°F) and regeneration prior to serving to a customer. In the UK under the Food Hygiene Regulations 1995 , storage up to 8°C (46°F) is permissible (although a lower temperature is necessary to maintain palatability). Airline meals are often prepared using this method. Storage should only be for five days, including the day of production and consumption. 2. The use of high-barrier...

eyes

eyes   Reference library

Paul S. Kindstedt

The Oxford Companion to Cheese

Reference type:
Subject Reference
Current Version:
2017

...sufficiently to supersaturate the water phase, the cheese must possess a suitable barrier to gas diffusion at the surface, either in the form of a dense dehydrated natural rind or an exogenous coating or film applied to the cheese surface. An essential prerequisite to eye formation is a very tight, close-knit, and elastic cheese texture, free of mechanical openings, that expands without fracturing under the internal pressure applied on the curd matrix by the growing gas bubble. Excessive demineralization during manufacture, which results in abnormally low...

permeability

permeability   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...industry, is intrinsic permeability, measured in m 2 (or in industrial units called darcies ), which depends on the properties of the rock alone. 2. Property of a membrane or other barrier, being the ease with which a substance will diffuse or pass across it. 3. Capacity of a material to transmit fluids, expressed as hydraulic conductivity. In soils, the ease with which gases, liquids, or plant roots penetrate into or pass through a layer of soil. 4. (magnetic permeability) The ratio of the magnetic flux density in a medium to the magnetizing force. In...

Barometric Pressure

Barometric Pressure   Reference library

Encyclopedia of Climate and Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2011

...of air flowing into the same region at lower levels; thus barometric pressure can he affected by large-scale weather circulations. It is important to appreciate that the behavior of temperature, density, and pressure of a gas, so straightforward in the laboratory, is much more complex in the free atmosphere where there are no barriers to constrain the air. The temperature of Earth's atmosphere varies over a wide range in time and space. Given such temperature variations, the atmosphere also exhibits strong horizontal variations in air pressure. Horizontal...

lungs

lungs   Reference library

The Oxford Companion to the Body

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Life Sciences
Length:
2,600 words
Illustration(s):
2

...between blood and air, since the rate of diffusion of a gas depends on the surface area, the thinness of the diffusion barrier, and the solubility of the gas ( Fick's Law ). The alveolar wall is extremely thin, from 0.2–0.5 μm, depending on the degree of inflation of the lungs. The barrier to diffusion has three components. On the surface of the alveoli is a thin layer of secretion, containing surfactant, the detergent phospholipid that lowers the surface tension of the lungs and allows them to be stretched by relatively low pressures. The surfactant layer is...

respiration

respiration   Reference library

Thomas Kraus-Weyermann

The Oxford Companion to Beer

Reference type:
Subject Reference
Current Version:
2013

...barley is essentially the “breathing” of the live barley kernel. Like our own breathing, it involves the uptake of ambient oxygen and the release of carbon dioxide. During dormancy, the seed’s husks and protective coat—called the testa layer and the pericarp layer—serve as barriers to gas exchanges between the internal living cells and the exterior, thus limiting the rate of respiration. But once the grain is awoken during steeping and germination, the grain’s respiration rate depends on several factors, most important on the grain’s protein and moisture...

Xenakis, Yannis

Xenakis, Yannis (1922–2001)   Quick reference

Who's Who in the Twentieth Century

Reference type:
Subject Reference
Current Version:
2003
Subject:
History
Length:
333 words

...compositions are Pithoprakta ( 1955–56 ), based on the Maxwell–Boltzmann law of the movement of gas molecules, in which the pizzicati and glissandi of separate instruments become totally subordinated to the overall sound mass; Duel ( 1959 ), for fifty-four instruments and two conductors; and Terretektorh ( 1966 ), in which eighty-eight musicians (each with additional percussion instruments) are seated among the audience, thus breaking down the barrier between performer and audience. Later works, in some of which he made use of folk music, include ...

enhanced greenhouse effect

enhanced greenhouse effect   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

...greenhouse gases into the atmosphere, namely CFCs (chlorofluorocarbons) and other halocarbons. These gases are released from aerosols, refrigeration units, insulating foams, and industrial plants. They are now recognized as one of the principal causes for the destruction of the ozone layer. They are, however, also very effective greenhouse gases. For example, when compared to carbon dioxide, the anthropogenically produced gas CFC-11 is some 120 00 times more effective in trapping heat in the atmosphere. The atmospheric concentration of these gases is very low,...

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