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An accounting information system (AIS) is a system of collecting, storing and processing financial and accounting data that are used by decision makers . An accounting information system is generally a computer-based method for tracking accounting activity in conjunction with information technology resources. The resul... | https://en.wikipedia.org/wiki/Accounting_information_system |
Accounts of Materials Research ( Chinese : 材料研究述評 ) is a monthly peer-reviewed scientific journal published in partnership between ShanghaiTech University and American Chemical Society . It was rewarded by the Chinese government through Action Plan for the Excellence of Chinese STM Journals in 2020. [ 1 ]
The journal ... | https://en.wikipedia.org/wiki/Accounts_of_Materials_Research |
Accredo Health Group, Inc. is a specialty pharmaceutical and service provider for patients with complex and chronic health conditions. [ 1 ] Accredo provides specialty drugs, drugs that cost more than $600 per month, with the average being $10,000 a month, which treat serious conditions such as multiple sclerosis, rheu... | https://en.wikipedia.org/wiki/Accredo |
In astrophysics , accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, into an accretion disk . [ 1 ] [ 2 ] Most astronomical objects , such as galaxies , stars , and planets , are formed by accretion processes.
The accretion model that E... | https://en.wikipedia.org/wiki/Accretion_(astrophysics) |
An accretion disk is a structure (often a circumstellar disk ) formed by diffuse material [ a ] in orbital motion around a massive central body . The central body is most frequently a star . Friction , uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the... | https://en.wikipedia.org/wiki/Accretion_disk |
In mathematics, a limit point , accumulation point , or cluster point of a set S {\displaystyle S} in a topological space X {\displaystyle X} is a point x {\displaystyle x} that can be "approximated" by points of S {\displaystyle S} in the sense that every neighbourhood of x {\displaystyle x} contains a point of S {\di... | https://en.wikipedia.org/wiki/Accumulation_point |
A hydraulic accumulator is a pressure storage reservoir in which an incompressible hydraulic fluid is held under pressure that is applied by an external source of mechanical energy . The external source can be an engine, a spring , a raised weight , or a compressed gas . [ note 1 ] An accumulator enables a hydraulic sy... | https://en.wikipedia.org/wiki/Accumulator_tower |
The acentric factor ω is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids . [ 1 ] It has become a standard for the phase characterization of single and pure components, along with other state description parameters such as molecular weight , critical temperature... | https://en.wikipedia.org/wiki/Acentric_factor |
The Acer Chromebook Tab 10 ( D651N ) is a tablet computer manufactured by Acer Inc. It is the first ChromeOS tablet that was released and received software updates until 2023. [ 1 ] [ 2 ] The tablet was announced in March 2018. [ 3 ]
The SoC is a Rockchip OP1. It has 4GiB RAM and 32GiB of storage, which can be extende... | https://en.wikipedia.org/wiki/Acer_Chromebook_Tab_10 |
In organic chemistry , an acetal is a functional group with the connectivity R 2 C(OR') 2 . Here, the R groups can be organic fragments (a carbon atom, with arbitrary other atoms attached to that) or hydrogen , while the R' groups must be organic fragments not hydrogen. The two R' groups can be equivalent to each other... | https://en.wikipedia.org/wiki/Acetal |
This page provides supplementary chemical data on acetaldehyde .
The handling of this chemical may require safety precautions. The directions on the Material Safety Datasheet ( MSDS ) should be followed.
Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
Linstrom, Peter (1997). "NIST Standard Re... | https://en.wikipedia.org/wiki/Acetaldehyde_(data_page) |
This page provides supplementary chemical data on acetic acid .
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet ( MSDS ) for this chemical from a reliable source and follow its directions.
Table data obtained from CRC Handbook of C... | https://en.wikipedia.org/wiki/Acetic_acid_(data_page) |
Acetic acid bacteria ( AAB ) are a group of Gram-negative bacteria which oxidize sugars or ethanol and produce acetic acid during fermentation . [ 1 ] The acetic acid bacteria consist of 10 genera in the family Acetobacteraceae . [ 1 ] Several species of acetic acid bacteria are used in industry for production of certa... | https://en.wikipedia.org/wiki/Acetic_acid_bacteria |
Acetochlor is an herbicide developed by Monsanto Company and Zeneca . It is a member of the class of herbicides known as chloroacetanilides. Its mode of action is elongase inhibition , and inhibition of geranylgeranyl pyrophosphate (GGPP) cyclization enzymes, part of the gibberellin pathway. It carries high risks of en... | https://en.wikipedia.org/wiki/Acetochlor |
An acetogen is a microorganism that generates acetate (CH 3 COO − ) as an end product of anaerobic respiration or fermentation . However, this term is usually employed in a narrower sense only to those bacteria and archaea that perform anaerobic respiration and carbon fixation simultaneously through the reductive acety... | https://en.wikipedia.org/wiki/Acetogen |
Acetogenesis is a process through which acetyl-CoA [ 1 ] or acetic acid is produced by anaerobic bacteria through the reduction of CO 2 via the Wood–Ljungdahl pathway . Other microbial processes that produce acetic acid (like certain types of fermentation or the oxidative breakdown of carbohydrates or ethanol by acetic... | https://en.wikipedia.org/wiki/Acetogenesis |
Acetone ( 2-propanone or dimethyl ketone ) is an organic compound with the formula (CH 3 ) 2 CO . [ 22 ] It is the simplest and smallest ketone ( R−C(=O)−R' ). It is a colorless, highly volatile , and flammable liquid with a characteristic pungent odor. [ 23 ]
Acetone is miscible with water and serves as an important... | https://en.wikipedia.org/wiki/Acetone |
This page provides supplementary chemical data on acetone .
The handling of this chemical may incur notable safety precautions. It is highly recommended that you seek the Material Safety Datasheet ( MSDS ) for this chemical from a reliable source and follow its directions.
Table data obtained from CRC Handbook of Che... | https://en.wikipedia.org/wiki/Acetone_(data_page) |
Acetone peroxide ( / æ s ə ˈ t ə ʊ n p ɛr ˈ ɒ k s aɪ d / ⓘ also called APEX and mother of Satan [ 3 ] [ 4 ] ) is an organic peroxide and a primary explosive . It is produced by the reaction of acetone and hydrogen peroxide to yield a mixture of linear monomer and cyclic dimer , trimer , and tetramer forms. The monomer ... | https://en.wikipedia.org/wiki/Acetone_peroxide |
Acetone–butanol–ethanol (ABE) fermentation , also known as the Weizmann process , is a process that uses bacterial fermentation to produce acetone , n-butanol , and ethanol from carbohydrates such as starch and glucose . It was developed by chemist Chaim Weizmann and was the primary process used to produce acetone, whi... | https://en.wikipedia.org/wiki/Acetone–butanol–ethanol_fermentation |
In organic chemistry , an acetonide is the functional group composed of the cyclic ketal of a diol with acetone . The more systematic name for this structure is an isopropylidene ketal. Acetonide is a common protecting group for 1,2- and 1,3- diols . [ 1 ] The protecting group can be removed by hydrolysis of the ketal ... | https://en.wikipedia.org/wiki/Acetonide |
This page provides supplementary chemical data on acetonitrile .
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet ( MSDS ) for this chemical from a reliable source and follow its directions.
Table data obtained from CRC Handbook of ... | https://en.wikipedia.org/wiki/Acetonitrile_(data_page) |
In organic chemistry , acetophenide is a functional group which is composed of the cyclic ketal of a diol with acetophenone . [ 1 ] In pharmaceutical chemistry, it is present in algestone acetophenide (dihydroxyprogesterone acetophenide) and amcinafide (triamcinolone acetophenide). [ 1 ] [ 2 ]
This organic chemistry a... | https://en.wikipedia.org/wiki/Acetophenide |
In organic chemistry , the acetoxy group (abbr. AcO or OAc ; IUPAC name : acetyloxy [ 1 ] ), is a functional group with the formula −OCOCH 3 and the structure −O−C(=O)−CH 3 . As the -oxy suffix implies, it differs from the acetyl group ( −C(=O)−CH 3 ) by the presence of an additional oxygen atom. The name acetoxy is th... | https://en.wikipedia.org/wiki/Acetoxy_group |
Acetoxyacetylaminofluorene is a derivative of 2-acetylaminofluorene used as a biochemical tool in the study of carcinogenesis . It forms adducts with DNA by reacting with guanine at its C-8 position.; [ 1 ] This results in breaks in one strand of the DNA.
This article about an organic compound is a stub . You can hel... | https://en.wikipedia.org/wiki/Acetoxyacetylaminofluorene |
Acetyl-CoA ( acetyl coenzyme A ) is a molecule that participates in many biochemical reactions in protein, carbohydrate and lipid metabolism . [ 2 ] Its main function is to deliver the acetyl group to the citric acid cycle (Krebs cycle) to be oxidized for energy production.
Coenzyme A (CoASH or CoA) consists of a β-me... | https://en.wikipedia.org/wiki/Acetyl-CoA |
Acetyl nitrate is the organic compound with the formula CH 3 C(O)ONO 2 . It is classified as the mixed anhydride of nitric and acetic acids. It is a colorless explosive liquid that fumes in moist air.
It was first prepared in 1907 by Amé Pictet and E. Khotynsky from acetic anhydride and dinitrogen pentoxide , [ 1 ] f... | https://en.wikipedia.org/wiki/Acetyl_nitrate |
In chemistry , acetylation is an organic esterification reaction with acetic acid . It introduces an acetyl group into a chemical compound . Such compounds are termed acetate esters or simply acetates . Deacetylation is the opposite reaction, the removal of an acetyl group from a chemical compound.
Histone deacetylase... | https://en.wikipedia.org/wiki/Acetylation |
Acetyl- L -carnitine , ALCAR or ALC , is an acetylated form of L - carnitine . It is naturally produced by the human body, and it is available as a dietary supplement. Acetylcarnitine is broken down in the blood by plasma esterases to carnitine which is used by the body to transport fatty acids into the mitochondria fo... | https://en.wikipedia.org/wiki/Acetylcarnitine |
Acetylene ( systematic name : ethyne ) is a chemical compound with the formula C 2 H 2 and structure HC≡CH . It is a hydrocarbon and the simplest alkyne . [ 8 ] This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. [ 9 ] Pur... | https://en.wikipedia.org/wiki/Acetylene |
In organic chemistry , the term acetylenic designates | https://en.wikipedia.org/wiki/Acetylenic |
Acetylfentanyl ( acetyl fentanyl ) is an opioid analgesic drug that is an analog of fentanyl . [ 4 ] Studies have estimated acetylfentanyl to be 15 times more potent than morphine , [ 5 ] [ 6 ] which would mean that despite being somewhat weaker than fentanyl, it is nevertheless still several times stronger than pure h... | https://en.wikipedia.org/wiki/Acetylfentanyl |
In chemistry , an acetylide is a compound that can be viewed as the result of replacing one or both hydrogen atoms of acetylene (ethyne) HC≡CH by metallic or other cations . Calcium carbide is an important industrial compound, which has long been used to produce acetylene for welding and illumination . It is also a maj... | https://en.wikipedia.org/wiki/Acetylide |
The Acharius Medal is awarded by the International Association for Lichenology (IAL) for lifetime achievement in lichenology . [ 1 ] The organization resolved at its 1990 meeting that it would simultaneously honor professional achievement and commemorate Erik Acharius (recognized as the "Father of Lichenology") by pres... | https://en.wikipedia.org/wiki/Acharius_Medal |
The Acheson process is a method of synthesizing silicon carbide (SiC) and graphite invented by Edward Goodrich Acheson and patented by him in 1896.
The process consists of heating a mixture of silicon dioxide (SiO 2 ), in the form of silica or quartz sand, [ 1 ] and carbon , in its elemental form as powdered coke , i... | https://en.wikipedia.org/wiki/Acheson_process |
The Achmatowicz reaction , also known as the Achmatowicz rearrangement , is an organic synthesis in which a furan is converted to a dihydropyran . In the original publication by the Polish chemist Osman Achmatowicz Jr. (b. 20 December 1931 in Vilnius ) in 1971 [ 1 ] furfuryl alcohol is reacted with bromine in methanol ... | https://en.wikipedia.org/wiki/Achmatowicz_reaction |
Achnanthaceae is a family of algae belonging to the order Achnanthales , [ 1 ] [ 2 ] and was first described in 1844 by Friedrich Traugott Kützing . [ 2 ] [ 3 ]
Genera: [ 1 ] | https://en.wikipedia.org/wiki/Achnanthaceae |
Acicular ferrite is a microstructure of ferrite in steel that is characterised by needle-shaped crystallites or grains when viewed in two dimensions. The grains, actually three-dimensional in shape, have a thin lenticular shape. This microstructure is advantageous over other microstructures for steel because of its cha... | https://en.wikipedia.org/wiki/Acicular_ferrite |
Acid-fastness is a physical property of certain bacterial and eukaryotic cells , as well as some sub-cellular structures , specifically their resistance to decolorization by acids during laboratory staining procedures. [ 1 ] [ 2 ] Once stained as part of a sample, these organisms can resist the acid and/or ethanol-base... | https://en.wikipedia.org/wiki/Acid-fastness |
In acid catalysis and base catalysis , a chemical reaction is catalyzed by an acid or a base . By Brønsted–Lowry acid–base theory , the acid is the proton ( hydrogen ion , H + ) donor and the base is the proton acceptor. Typical reactions catalyzed by proton transfer are esterifications and aldol reactions . In these r... | https://en.wikipedia.org/wiki/Acid_catalysis |
In chemistry , an acid dissociation constant (also known as acidity constant , or acid-ionization constant ; denoted K a {\displaystyle K_{a}} ) is a quantitative measure of the strength of an acid in solution . It is the equilibrium constant for a chemical reaction
known as dissociation in the context of acid–bas... | https://en.wikipedia.org/wiki/Acid_dissociation_constant |
The terms acid egg and montejus (or monte-jus ) are sometimes used interchangeably to refer to a device with no moving parts formerly used instead of a pump in order to transfer difficult liquids. [ 1 ] [ 2 ] The principle is that a strong vessel containing the liquid is pressurized with gas or steam, forcing the liqui... | https://en.wikipedia.org/wiki/Acid_egg |
Acid gas is a particular typology of natural gas or any other gas mixture containing significant quantities of hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ), or similar acidic gases. A gas is determined to be acidic or not after it is mixed with water. The pH scale ranges from 0 to 14, anything above 7 is basic whil... | https://en.wikipedia.org/wiki/Acid_gas |
Acid grassland is a nutrient-poor habitat characterised by grassy tussocks and bare ground.
The vegetation is dominated by grasses and herbaceous plants, growing on soils deficient in lime (calcium). These may be found on acid sedimentary rock such as sandstone ; acid igneous rock such as granite ; and fluvial or glac... | https://en.wikipedia.org/wiki/Acid_grassland |
Acid guanidinium thiocyanate-phenol-chloroform extraction (abbreviated AGPC ) is a liquid–liquid extraction technique in biochemistry and molecular biology . It is widely used for isolating RNA (as well as DNA and protein in some cases). This method may take longer than a column-based system such as the silica-based pu... | https://en.wikipedia.org/wiki/Acid_guanidinium_thiocyanate-phenol-chloroform_extraction |
Acid-neutralizing capacity or ANC in short is a measure for the overall buffering capacity against acidification of a solution, e.g. surface water or soil water .
ANC is defined as the difference between cations of strong bases and anions of strong acids (see below), or dynamically as the amount of acid needed to chan... | https://en.wikipedia.org/wiki/Acid_neutralizing_capacity |
Acid orange 5 is a compound with formula Na(C 6 H 5 NHC 6 H 4 N=NC 6 H 4 SO 3 ). It is an azo dye .
It is also used as a pH indicator ; it is red in pH under 1.4, orange-yellow in pH over 3.2. [ 1 ]
Acid orange 5 may be prepared by diazotization of sulfanilic acid , followed by reaction with diphenylamine :
This arti... | https://en.wikipedia.org/wiki/Acid_orange_5 |
Acid phosphatase (EC 3.1.3.2, systematic name phosphate-monoester phosphohydrolase (acid optimum) ) is an enzyme that frees attached phosphoryl groups from other molecules during digestion . It can be further classified as a phosphomonoesterase . It is stored in lysosomes and functions when these fuse with endosomes ,... | https://en.wikipedia.org/wiki/Acid_phosphatase |
Acid salts are a class of salts that produce an acidic solution after being dissolved in a solvent . Its formation as a substance has a greater electrical conductivity than that of the pure solvent. [ 1 ] An acidic solution formed by acid salt is made during partial neutralization of diprotic or polyprotic acids . A ha... | https://en.wikipedia.org/wiki/Acid_salt |
Acid sulfate soils are naturally occurring soils, sediments or organic substrates (e.g. peat ) that are formed under waterlogged conditions. These soils contain iron sulfide minerals (predominantly as the mineral pyrite ) and/or their oxidation products. In an undisturbed state below the water table, acid sulfate soils... | https://en.wikipedia.org/wiki/Acid_sulfate_soil |
An acid test is a qualitative chemical or metallurgical assay utilizing acid . Historically, it often involved the use of a robust acid to distinguish gold from base metals . Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.... | https://en.wikipedia.org/wiki/Acid_test |
In chemistry , acid value ( AV , acid number , neutralization number or acidity ) is a number used to quantify the acidity of a given chemical substance . It is the quantity of base (usually potassium hydroxide (KOH)), expressed as milligrams of KOH required to neutralize the acidic constituents in 1 gram of a sample. ... | https://en.wikipedia.org/wiki/Acid_value |
Acidifiers are inorganic chemicals that, put into a human (or other mammalian ) body, either produce or become acid .
These chemicals increase the level of gastric acid in the stomach when ingested, thus decreasing the stomach pH .
Out of many types of acidifiers, the main four are:
Acidifier performance in distal s... | https://en.wikipedia.org/wiki/Acidifier |
An acid–base titration is a method of quantitative analysis for determining the concentration of Brønsted-Lowry acid or base (titrate) by neutralizing it using a solution of known concentration (titrant). [ 1 ] A pH indicator is used to monitor the progress of the acid–base reaction and a titration curve can be constru... | https://en.wikipedia.org/wiki/Acidimetry |
An acidity function is a measure of the acidity of a medium or solvent system, [ 1 ] [ 2 ] usually expressed in terms of its ability to donate protons to (or accept protons from) a solute ( Brønsted acidity ). The pH scale is by far the most commonly used acidity function, and is ideal for dilute aqueous solutions . Ot... | https://en.wikipedia.org/wiki/Acidity_function |
Acidogenesis is the second stage in the four stages of anaerobic digestion :
Anaerobic digestion is a complex biochemical process of biologically mediated reactions by a consortium of microorganisms to convert organic compounds into methane and carbon dioxide. It is a stabilization process that reduces odor, pathogens... | https://en.wikipedia.org/wiki/Acidogenesis |
An acid–base titration is a method of quantitative analysis for determining the concentration of Brønsted-Lowry acid or base (titrate) by neutralizing it using a solution of known concentration (titrant). [ 1 ] A pH indicator is used to monitor the progress of the acid–base reaction and a titration curve can be constru... | https://en.wikipedia.org/wiki/Acidometry |
Acidophiles or acidophilic organisms are those that thrive under highly acidic conditions (usually at pH 5.0 or below [ 1 ] ). These organisms can be found in different branches of the tree of life , including Archaea , Bacteria , [ 2 ] and Eukarya .
A list of these organisms includes:
Most acidophile organisms have ... | https://en.wikipedia.org/wiki/Acidophile |
The outflow of acidic liquids and other pollutants from mines is often catalysed by acid-loving microorganisms ; these are the acidophiles in acid mine drainage .
Acidophiles are not just present in exotic environments such as Yellowstone National Park [ 3 ] or deep-sea hydrothermal vents. [ 4 ] Genera such as Acidith... | https://en.wikipedia.org/wiki/Acidophiles_in_acid_mine_drainage |
An acidophobe is an organism that is intolerant of acidic environments. [ 1 ] The terms acidophobia , acidophoby and acidophobic are also used. [ 2 ] The term acidophobe is variously applied to plants , bacteria , protozoa , animals , chemical compounds , etc. The antonymous term is acidophile . [ 3 ]
Plants are known... | https://en.wikipedia.org/wiki/Acidophobe |
Acid–base imbalance is an abnormality of the human body's normal balance of acids and bases that causes the plasma pH to deviate out of the normal range (7.35 to 7.45). In the fetus , the normal range differs based on which umbilical vessel is sampled ( umbilical vein pH is normally 7.25 to 7.45; umbilical artery pH is... | https://en.wikipedia.org/wiki/Acid–base_disorder |
Acid–base extraction is a subclass of liquid–liquid extractions and involves the separation of chemical species from other acidic or basic compounds. [ 1 ] It is typically performed during the work-up step following a chemical synthesis to purify crude compounds [ 2 ] and results in the product being largely free of ac... | https://en.wikipedia.org/wiki/Acid–base_extraction |
Acid–base homeostasis is the homeostatic regulation of the pH of the body's extracellular fluid (ECF). [ 1 ] The proper balance between the acids and bases (i.e. the pH) in the ECF is crucial for the normal physiology of the body—and for cellular metabolism . [ 1 ] The pH of the intracellular fluid and the extracellula... | https://en.wikipedia.org/wiki/Acid–base_homeostasis |
In chemistry , an acid–base reaction is a chemical reaction that occurs between an acid and a base . It can be used to determine pH via titration . Several theoretical frameworks provide alternative conceptions of the reaction mechanisms and their application in solving related problems; these are called the acid–base ... | https://en.wikipedia.org/wiki/Acid–base_reaction |
An acid–base titration is a method of quantitative analysis for determining the concentration of Brønsted-Lowry acid or base (titrate) by neutralizing it using a solution of known concentration (titrant). [ 1 ] A pH indicator is used to monitor the progress of the acid–base reaction and a titration curve can be constru... | https://en.wikipedia.org/wiki/Acid–base_titration |
In control theory , Ackermann's formula provides a method for designing controllers to achieve desired system behavior by directly calculating the feedback gains needed to place the closed-loop system 's poles ( eigenvalues ) [ 1 ] at specific locations ( pole allocation problem).
These poles directly influence how th... | https://en.wikipedia.org/wiki/Ackermann's_formula |
In computability theory , the Ackermann function , named after Wilhelm Ackermann , is one of the simplest [ 1 ] and earliest-discovered examples of a total computable function that is not primitive recursive . All primitive recursive functions are total and computable, but the Ackermann function illustrates that not al... | https://en.wikipedia.org/wiki/Ackermann_function |
In data networking , telecommunications , and computer buses , an acknowledgement ( ACK ) is a signal that is passed between communicating processes , computers , or devices to signify acknowledgment, or receipt of message, as part of a communications protocol . Correspondingly a negative-acknowledgement ( NAK or NACK ... | https://en.wikipedia.org/wiki/Acknowledgement_(data_networks) |
clade Hypsogastropoda
Acmella nana is a species of land snail discovered from Borneo , Malaysia , in 2015. It was described by Jaap J. Vermeulen of the JK Art and Science in Leiden , Thor-Seng Liew of the Institute for Tropical Biology and Conservation at the Universiti Malaysia Sabah , and Menno Schilthuizen of the N... | https://en.wikipedia.org/wiki/Acmella_nana |
In particle physics , the acoplanarity of a scattering experiment is the degree to which the paths of the scattered particles deviate from being coplanar . Measurements of acoplanarity provide a test of perturbative quantum chromodynamics , because QCD predicts that the emission of gluons can lead to acoplanar scatteri... | https://en.wikipedia.org/wiki/Acoplanarity |
Acorda Therapeutics, Inc. is an American biotechnology company based in Pearl River, New York . The company develops therapies that improve neurological function in people with Parkinson's disease , multiple sclerosis and other neurological disorders. Acorda Therapeutics manufactures and markets the drugs Inbrija ( lev... | https://en.wikipedia.org/wiki/Acorda_Therapeutics |
In acoustics , acoustic attenuation is a measure of the energy loss of sound propagation through an acoustic transmission medium . Most media have viscosity and are therefore not ideal media. When sound propagates in such media, there is always thermal consumption of energy caused by viscosity. This effect can be quant... | https://en.wikipedia.org/wiki/Acoustic_attenuation |
In acoustical engineering , an acoustic circulator is a non-reciprocal three-port device that couples airborne sound waves only to an adjacent port in the direction of circulation.
Compared to radio frequency (RF) and microwave circulators , acoustic circulators are for airborne sound waves rather than for RF and mic... | https://en.wikipedia.org/wiki/Acoustic_circulator |
Acoustic cleaning is a maintenance method used in material-handling and storage systems that handle bulk granular or particulate materials , such as grain elevators , to remove the buildup of material on surfaces. An acoustic cleaning apparatus, usually built into the material-handling equipment, works by generating po... | https://en.wikipedia.org/wiki/Acoustic_cleaning |
In acoustics , acoustic dispersion is the phenomenon of a sound wave separating into its component frequencies as it passes through a material . The phase velocity of the sound wave is viewed as a function of frequency. Hence, separation of component frequencies is measured by the rate of change in phase velocities as ... | https://en.wikipedia.org/wiki/Acoustic_dispersion |
Acoustic droplet ejection (ADE) uses a pulse of ultrasound to move low volumes of fluids (typically nanoliters or picoliters) without any physical contact. This technology focuses acoustic energy into a fluid sample in order to eject droplets as small as a picoliter . ADE technology is a very gentle process, and it c... | https://en.wikipedia.org/wiki/Acoustic_droplet_ejection |
Acoustic droplet vaporization ( ADV ) is the process by which superheated liquid droplets are phase-transitioned into gas bubbles by means of ultrasound . Perfluorocarbons and halocarbons are often used for the dispersed medium , which forms the core of the droplet. [ 1 ] The surfactant , which forms a stabilizing shel... | https://en.wikipedia.org/wiki/Acoustic_droplet_vaporization |
Acoustic ecology , sometimes called ecoacoustics or soundscape studies, is a discipline studying the relationship, mediated through sound, between human beings and their environment . [ 1 ] Acoustic ecology studies started in the late 1960s with R. Murray Schafer a musician, composer and former professor of communicati... | https://en.wikipedia.org/wiki/Acoustic_ecology |
Acoustic emission ( AE ) is the phenomenon of radiation of acoustic (elastic) waves in solids that occurs when a material undergoes irreversible changes in its internal structure, for example as a result of crack formation or plastic deformation due to aging, temperature gradients, or external mechanical forces. [ 1 ]
... | https://en.wikipedia.org/wiki/Acoustic_emission |
Acoustic foam is an open celled foam used for acoustic treatment . It attenuates airborne sound waves, reducing their amplitude , for the purposes of noise reduction or noise control . [ 1 ] The energy is dissipated as heat . [ 2 ] Acoustic foam can be made in several different colors, sizes and thickness. [ 3 ]
Acous... | https://en.wikipedia.org/wiki/Acoustic_foam |
Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting from an acoustic pressure applied to the system. The SI unit of acoustic impedance is the pascal-second per cubic metre (symbol Pa·s/m 3 ), or in the MKS system the rayl per square met... | https://en.wikipedia.org/wiki/Acoustic_impedance |
Acoustic location is a method of determining the position of an object or sound source by using sound waves. Location can take place in gases (such as the atmosphere), liquids (such as water), and in solids (such as in the earth).
Location can be done actively or passively:
Both of these techniques, when used in wate... | https://en.wikipedia.org/wiki/Acoustic_location |
Acoustic lubrication or sonic lubrication occurs when sound (measurable in a vacuum by placing a microphone on one element of the sliding system) permits vibration to introduce separation between the sliding faces. This could happen between two plates or between a series of particles. The frequency of sound required ... | https://en.wikipedia.org/wiki/Acoustic_lubrication |
An acoustic metamaterial , sonic crystal , or phononic crystal is a material designed to manipulate sound waves or phonons in gases , liquids , and solids ( crystal lattices ). By carefully controlling properties such as the bulk modulus β , density ρ , and chirality , these materials can be tailored to interact with s... | https://en.wikipedia.org/wiki/Acoustic_metamaterial |
Acoustic microscopy is microscopy that employs very high or ultra high frequency ultrasound . Acoustic microscopes operate non-destructively and penetrate most solid materials to make visible images of internal features, including defects such as cracks, delaminations and voids .
The notion of acoustic microscopy date... | https://en.wikipedia.org/wiki/Acoustic_microscopy |
An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves . Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events. Pairs of large parabolic acoustic mirrors which func... | https://en.wikipedia.org/wiki/Acoustic_mirror |
Acoustic panels (also sound absorption panels , soundproof panels or sound panels ) are sound-absorbing fabric-wrapped boards designed to control echo and reverberation in a room. [ 1 ] Most commonly used to resolve speech intelligibility issues in commercial soundproofing treatments. Most panels are constructed with a... | https://en.wikipedia.org/wiki/Acoustic_panel |
Acoustic resonance spectroscopy ( ARS ) is a method of spectroscopy in the acoustic region, primarily the sonic and ultrasonic regions. ARS is typically much more rapid than HPLC and NIR . It is non destructive and requires no sample preparation as the sampling waveguide can simply be pushed into a sample powder/liquid... | https://en.wikipedia.org/wiki/Acoustic_resonance_spectroscopy |
An acoustic rheometer is a device used to measure the rheological properties of fluids , such as viscosity and elasticity, by utilizing sound waves . It works by generating acoustic waves in the fluid and analyzing the changes in the wave propagation caused by the fluid's rheological behavior. An acoustic rheometer use... | https://en.wikipedia.org/wiki/Acoustic_rheometer |
Acoustic theory is a scientific field that relates to the description of sound waves . It derives from fluid dynamics . See acoustics for the engineering approach.
For sound waves of any magnitude of a disturbance in velocity, pressure, and density we have
In the case that the fluctuations in velocity, density, and p... | https://en.wikipedia.org/wiki/Acoustic_theory |
Acoustic transmission is the transmission of sounds through and between materials, including air, wall, and musical instruments.
The degree to which sound is transferred between two materials depends on how well their acoustical impedances match.
Musical instruments are generally designed to radiate sound effectively... | https://en.wikipedia.org/wiki/Acoustic_transmission |
An acoustic transmission line is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted manner. Technically it is the acoustic analog of the electrical transmission line , typically conceived as a rigid-walled duct or tube, that is long and thin relative t... | https://en.wikipedia.org/wiki/Acoustic_transmission_line |
Acoustical engineering (also known as acoustic engineering ) is the branch of engineering dealing with sound and vibration . It includes the application of acoustics , the science of sound and vibration, in technology. Acoustical engineers are typically concerned with the design, analysis and control of sound.
One goa... | https://en.wikipedia.org/wiki/Acoustical_engineering |
Acoustocerebrography (ACG) is a medical test used to diagnose changes and problems in the brain and the central nervous system . [ 1 ] It allows for the noninvasive examination of the brain's cellular and molecular structure. It can also be applied as a means to diagnose and monitor intracranial pressure , for example ... | https://en.wikipedia.org/wiki/Acoustocerebrography |
The acoustoelastic effect is how the sound velocities (both longitudinal and shear wave velocities) of an elastic material change if subjected to an initial static stress field. This is a non-linear effect of the constitutive relation between mechanical stress and finite strain in a material of continuous mass . In cla... | https://en.wikipedia.org/wiki/Acoustoelastic_effect |
Acoustoelastography is an ultrasound technique that relates ultrasonic wave amplitude changes to a tendon 's mechanical properties. [ 1 ]
See also the page on the acoustoelastic effect .
This acoustics -related article is a stub . You can help Wikipedia by expanding it .
This article related to medical technology is... | https://en.wikipedia.org/wiki/Acoustoelastography |
Acqua Panna is an Italian brand of bottled water and one of the world's largest bottled water brands. [ 1 ] [ 3 ] [ 4 ] The brand belongs to Sanpellegrino S.p.A subsidiary of Nestlé . Acqua Panna takes its name from Villa Panna in the hills of Tuscany , where the natural spring was first discovered. The water was firs... | https://en.wikipedia.org/wiki/Acqua_Panna |
Acqua Santa Maria is the main brand of the company Sicil Acque Minerali, Si.A.M. srl that is a company with registered office in Ragusa and operational headquarters Modica in Sicily , which since 1992 manages the extraction and bottling of mineral waters .
SI.A.M. SRL, was established in 1992, has its registered offic... | https://en.wikipedia.org/wiki/Acqua_Santa_Maria |
An acqua alta ( / ˌ æ k w ə ˈ æ l t ə / , [ 1 ] Italian: [ˈakkwa ˈalta] ⓘ ; lit. ' high water ' ) is an exceptional tide peak that occurs periodically in the northern Adriatic Sea . The term is applied to such tides in the Italian region of Veneto . The peaks reach their maximum in the Venetian Lagoon , where they caus... | https://en.wikipedia.org/wiki/Acqua_alta |
An acquired characteristic is a non- heritable change in a function or structure of a living organism caused after birth by disease, injury, accident, deliberate modification, variation, repeated use, disuse, misuse, or other environmental influence. [ 1 ] Acquired traits are synonymous with acquired characteristics. T... | https://en.wikipedia.org/wiki/Acquired_characteristic |
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