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- Alien species: A species that has been transported by human activities, intentional or accidental, into a region where it does not naturally occur. (Also known as an exotic, introduced, nonindigenous, or...>more
- Alien species: A species that has been transported by human activities, intentional or accidental, into a region where it does not naturally occur. (Also known as an exotic, introduced, nonindigenous, or...>more
- Aligner: Lithography machine which makes it possible to align a mask, or a reticle, according to marking previously engraved on the silicon wafer. There are four types of aligners: contact, proximity...>more
- Alignment: The arranging of a mask and wafer in correct positions with respect to each other. After alignment, radiation-sensitive photoresist on the wafer is exposed by radiation passing through the...>more
- Alignment mark: A reference mark used in the alignment of the several photomask layers required for a single device or circuit. >more
- Alkaline: Alkaline is when the concentration of the soil solution is above 7.0. >more
- Alkyl group: An alkyl is a functional group of an organic chemical that contains only carbon and hydrogen atoms, which are arranged in a chain. They have general formula C n H 2n+1 . Examples include methyl...>more
- Alkylation: Alkylation is the transfer of an alkyl group from one molecule to another. The alkyl group may be transferred as an alkyl carbocation , a free radical , a carbanion or a carbene (or...>more
- Allele: An allele is one part of a gene which specifies a characteristic for the trait that gene is coded. For example, in the eye color gene, there are two main alleles, blue and brown. How the trait...>more
- Allergy: Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms. Symptoms of the allergic diseases may be caused by...>more
- Alliance of Small Island States (AOSIS): The Alliance of Small Island States is a coalition of 42 (as of May 2000) low-lying and small island countries, most of which are members of the G-77, that are particularly vulnerable to sea-level...>more
- Allopatric: Existing in different areas; populations or species occupying mutually exclusive geographic areas; opposite of sympatric, also refers to population or taxa whose ranges do not overlap.>more
- Allopatric speciation: A method of speciation which is triggered by a geographical barrier separating the organism from its ancestral population. In fish, this might be because fish have become trapped in a lake and...>more
- Alluvial Aquifer: An alluvial aquifer is formed by the deposition of weathered materials such as sand and silt particles. The water flow in these aquifers is very slow. When alluvial aquifers become contaminated,...>more
- Alpha-linolenic acid: An essential fatty acid and the major omega-3 fatty acid found in [plant based] food. Essential fatty acids are not produced by the body and must be present in the diet to maintain health. The...>more
- Alpha:: A type of processor. Some of the CPUs doing L2 processing are alphas. So are d0ola, d0olb and d0olc >more
- Alpha:: A type of processor. Some of the CPUs doing L2 processing are alphas. So are d0ola, d0olb and d0olc >more
- alphanumeric code: A character string consisting of a combination of letters,
numbers, and/or special characters used to represent text, commands, numbers,
and/or code groups.>more
- Also the robots make sex?: The artist Paul Granjon has developed a brace of rudimentali robots equips you of sexual identity: the male chases the female, and once caught up he tries... the copulazione Cardiff - Paul...>more
- Alternating current: Alternating Current (AC) is a type of electrical current, in which the direction of the flow of electrons switches back and forth at regular intervals or cycles. Current flowing in power lines...>more
- Alternative fuels & Energy: The definition of alternative fuel varies according to the context of its usage. In the context of petroleum substitutes, the term 'alternative fuel' can imply any available fuel or...>more
- Aluminum: A soft, lightweight, silver-white metallic chemical element that is the third most common element. Aluminum is denoted by the symbol Al and has an atomic number of 13, an atomic weight of...>more
- Aluminum Chemical Vapor Deposition (ALCVD): A CVD process that results in deposited aluminum on a substrate.>more
- Aluminum Interconnect: Aluminum pathways within a microchip that connect the transistors. >more
- Aluminum Low Pressure Seed (ALPS): ALPS is originally an aluminum process, now also used for other metal PVD processes. >more
- AMANDA (Antartic Muon And Neutrino Detector Array): A Cherenkov detector , embedding in the ice located at the south pole, designed to look at very high energy neutrinos. For more information see http://amanda.berkeley.edu/amanda/amanda.html . >more
- Ambient: Refers to surrounding environmental conditions such as temperature or noise.In the case of air, ambient air often refers to outdoor air as opposed to indoor air. Ambient or ambience may refer...>more
- Ambient Control Chamber (ACC): A Synexis chamber that stores and pressurizes in-process wafers. The chamber attaches to the side of the factory interface and is fed by the FI robots. >more
- ambient temperature.: The temperature of the air surrounding a device.>more
- Ambro van Hoof, Ph.D.: Assistant Professor Microbiology and Molecular Genetics University of Texas Health Sciences Center at Houston 6431 Fannin Street MSB1.212 Houston, TX 77030 Phone: (713) 500-5234 Fax: (713)...>more
- American National Standards Institute (ANSI): A clearinghouse and coordinating
agency for voluntary standards in the United States.>more
- American Wire Gauge (AWG): A standard system used to designate the size of
electrical conductors. Gauge numbers have an inverse relationship to size; larger
gauges have a smaller diameter.>more
- Americium: Americium is a silvery metal and a completely man-made element whose 6 known isotopes are all radioactive . Americium-241 , the most common isotope, is formed spontaneously by the decay of...>more
- Ames Test: Developed by Dr. Bruce Ames in 1979, this test allows for the classification of chemicals with regards to their carcinogenicity/mutagenicity (Ames, B.N., 1979. Identifying environmental chemicals...>more
- Amino acid(s): An amino acid molecule has the general formula NH 2 CHRCOOH, where "R" is any one of a number of side groups. Amino acids are building blocks (small molecules that link together to form long...>more
- Ammonia: A colorless gaseous alkaline compound (chemical formula NH3). It is very soluble in water, has a characteristic pungent odor, is irritant, is lighter than air, and is formed as a result of the...>more
- Ammonium nitrate (NH4NO3): Ammonium nitrate is 46% nitrogen, is applied to the soil as prilled fertilizer, and can be subject to substantial nitrogen volatilization losses, expecially under warm, moist, high residue...>more
- Ammonium polyphosphate (APP): Ammonium polyphosphate are liquid products made from the reaction between ammonia and superphosphate acid. It is used primarily in fertigation, weed and feed, and seed-placed applications. >more
- Ammonium sulfate: Ammonium sulfate is 21%N, is a highly hygroscopic granular material, and is often used when crop producers are trying to correct a sulfur deficiency along with applying some N. >more
- Amorphous silicon: A type of silicon deposited on a variety of surfaces (rigid and flexible) with thin homogenous layers. Amorphous silicon absorbs light more effectively than crystalline silicon, so the cells can be...>more
- Amphetamines: Amphetamines are man-made stimulant drugs. Their effects usually last for several hours and include stimulation of the central nervous system , a sense of well-being and higher energy, a...>more
- Amplifier: In general, any device that increases the voltage, current, or power of a signal. In telecom contexts, it refers to any device placed along a phone line that strengthens a voice signal. Most...>more
- Amplifier settings: The brains of any headset system, the amplifier houses all the controls for your headset. When you first connect your system, you may need to adjust the amp settings, so your headset works...>more
- An airplane that hung 8 chili: The National Research Council and l`Università of Naples Federico II have realized the first aircraft without pilot. Only hung 8 chili and it is in a position to facing missions of exploration to...>more
- An ecosystem in order to breathe better: Soon, raising the snout to the sky, it could capitarvi see an aerial small with a funny nose and one strange equipment mails on its front extremity; or taking a walk in some Italian forest you...>more
- An enormous flying laboratory: A former Soviet spy airplane has been transformed in the greatest laboratory flying existing to the world for the study of the climatic changes us. Slid 20 January has left from Seville to the...>more
- AN INTRODUCTION TO MINING SEISMOLOGY, 55: By Slawomir Gibowicz , Institute of Geophysics, Polish Academy of Sciences Andrzej Kijko , Institute of Geophysics, Polish Academy of Sciences Included in series International...>more
- Anaerobic: Anaerobic refers to the absence of oxygen>more
- Anaerobic: Anaerobic>more
- Analog: Refers to a continuous, variable sound wave that is used to transmit signals from one location to another. Television, radio, and telephones have traditionally used analog signals as their...>more
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