| 释义 |
alpha
al·pha A0224500 (ăl′fə)n.1. The first letter of the Greek alphabet. See Table at alphabet.2. The first of a series; the beginning.3. Astronomy The brightest star in a constellation.4. a. The mathematical estimate of the return on a security when the return on the market as a whole is zero. Alpha is derived from a in the formula Ri = a + bRm, which measures the return on a security (Ri) for a given return on the market (Rm) where b is beta.b. The return on an investment portfolio that can be attributed to the skill of the portfolio's manager rather than the performance of the market.adj.1. Being the highest ranked or most dominant individual of one's sex. Used of social animals: the alpha female of the wolf pack.2. Chemistry a. Being in the first position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted.b. Referring to the first of a group of isomers, or molecules of similar origin or properties, determined arbitrarily by those who discover or classify them. Used in combination: alpha-tocopherol.3. Alphabetical.
[Greek, of Phoenician origin; see ʔlp in Semitic roots.]alpha (ˈælfə) n1. (Letters of the Alphabet (Foreign)) the first letter in the Greek alphabet (Α, α), a vowel transliterated as a2. (Education) Brit the highest grade or mark, as in an examination3. (General Physics) (modifier) a. involving or relating to helium-4 nuclei: an alpha particle. b. relating to one of two or more allotropes or crystal structures of a solid: alpha iron. c. relating to one of two or more isomeric forms of a chemical compound, esp one in which a group is attached to the carbon atom to which the principal group is attached4. (modifier) denoting the dominant person or animal in a group: the alpha male. [via Latin from Greek, of Phoenician origin; related to Hebrew āleph, literally: ox]
Alpha (ˈælfə) n1. (Astronomy) (foll by the genitive case of a specified constellation) usually the brightest star in a constellation: Alpha Centauri. 2. (Communications & Information) communications a code word for the letter aal•pha (ˈæl fə)
n., pl. -phas,
adj. n. 1. the first letter of the Greek alphabet (Α, α). 2. the first; beginning. 3. (cap.) the brightest star in a constellation: Alpha Centauri. 4. the first or foremost in a series of related items. adj. 5. a. (esp. of animals) having the highest rank of its sex in a dominance hierarchy: the alpha female. b. being the most prominent, talented, or aggressive person in a group: the alpha male of investment bankers. 6. pertaining or linked to the carbon atom closest to a particular group in an organic molecule. [< Latin < Greek álpha < Semitic; compare aleph] Thesaurus| Noun | 1. |  alpha - the 1st letter of the Greek alphabetGreek alphabet - the alphabet used by ancient Greeksalphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters" | | 2. |  alpha - the beginning of a series or sequence; "the Alpha and Omega, the first and the last, the beginning and the end"--Revelationsstart - the beginning of anything; "it was off to a good start" | | Adj. | 1. |  alpha - first in order of importance; "the alpha male in the group of chimpanzees"; "the alpha star in a constellation is the brightest or main star"important, of import - of great significance or value; "important people"; "the important questions of the day" | | 2. |  alpha - early testing stage of a software or hardware product; "alpha version"explorative, exploratory - serving in or intended for exploration or discovery; "an exploratory operation"; "exploratory reconnaissance"; "digging an exploratory well in the Gulf of Mexico"; "exploratory talks between diplomats" |
alpha nounthe alpha and omega first and last, be-all and end-all He was the alpha and omega of the comedy series.Translationsalpha
alpha and omegaThe beginning and the end; the entirety of something. (Alpha and omega are the first and last letters of the Greek alphabet.) In order to do well on the exam, you need to know the alpha and omega of the textbook.See also: alpha, and, omegaalpha male1. The dominant male in the social hierarchy of an animal group. Emerging research on animal groups suggests that alpha males may have more complex roles than previously thought.2. By extension, a man who asserts dominance socially and professionally, typically by assuming leadership roles and easily acquiring sexual partners. He walks into the room with such confidence that you immediately know he's an alpha male.See also: alpha, maleAlpha CharlieA euphemistic way to refer to an "ass-chewing," a harsh or angry scolding. (When spelling something out with the NATO phonetic alphabet, the words "alpha" and "Charlie" are commonly used for the letters A and C.) The boss is totally going to give us an Alpha Charlie if he hears that we lost that big client.See also: alpha, Charliealpha and omegaboth the beginning and the end; the essentials, from the beginning to the end; everything, from the beginning to the end. He was forced to learn the alpha and omega of corporate law in order to even talk to the lawyers. He loved her deeply. She was his alpha and omega.See also: alpha, and, omegaalpha and omegaThe beginning and the end, the first and the last, as in She had to master the alpha and omega of the new computer program before she could even begin . This idiom and its meaning, based on the first and last letters of the Greek alphabet, appears in the New Testament (Revelation 1:8): "I am Alpha and Omega, the beginning and the ending, saith the Lord," where it is repeated three more times. See also: alpha, and, omegaalpha and omega 1 the beginning and the end. 2 the essence or most important features. Alpha and omega are respectively the first and last letters of the Greek alphabet. Christians use the phrase as a title for Jesus Christ, taking it from Revelation 1:8: ‘I am Alpha and Omega, the beginning and the ending, saith the Lord’. 2 1994 BBC Holidays At Cambridge…you'll find the alpha and omega of American academic life: historic Harvard and space-age MIT (Massachusetts Institute of Technology). See also: alpha, and, omegaAlpha Charlie n. a bawling out; a severe scolding. (Based on AC = ass-chewing. NATO Phonetic Alphabet.) The cop stopped me and gave me a real Alpha Charlie for speeding. See also: alpha, Charliealpha and omega, theThe sum of something, the beginning and the end, symbolized by the first (alpha) and last (omega) letters of the Greek alphabet. The Book of Revelation (1:8) states: “I am Alpha and Omega, the beginning and the ending, saith the Lord.” The modern equivalent is a to z. See also from soup to nuts.See also: alpha, andalpha
alpha [al´fah] the first letter of the Greek alphabet, α; used to denote the first position in a classification system; as, in names of chemical compounds, to distinguish the first in a series of isomers, or to indicate the position of substituent atoms or groups; also used to distinguish types of radioactive decay, brain waves or rhythms, adrenergic receptors, and secretory cells that stain with acid dyes, such as the alpha cells of the pancreas.alpha-adrenergic blocking agent (alpha-blocker) (alpha-blocking agent) any of a group of drugs that selectively inhibit the activity of receptors" >alpha receptors in the sympathetic nervous system. As with beta-adrenergic blocking agents" >beta-adrenergic blocking agents, alpha-blocking agents compete with the catecholamines" >catecholamines at peripheral autonomic receptor sites. This group includes ergot" >ergot and its derivatives, and phentolamine" >phentolamine.alpha chain disease the most common heavy chain disease, occurring predominantly in young adults in the Mediterranean area, and characterized by plasma cell infiltration of the lamina propria of the small intestine resulting in malabsorption with diarrhea, abdominal pain, and weight loss, or, exceedingly rarely, by pulmonary involvement. The gastrointestinal form is immunoproliferative small intestine disease.alpha-fetoprotein (AFP) a plasma protein produced by the fetal liver, yolk sac, and gastrointestinal tract and also by carcinoma" >hepatocellular carcinoma, germ cell neoplasms, and other cancers in adults; elevated levels may also be seen in benign liver disease such as cirrhosis and viral hepatitis. The serum AFP level is used to monitor the effectiveness of cancer treatment.
During pregnancy some AFP crosses from the amniotic fluid to the mother's blood. If the fetus has a neural tube defect, large amounts of AFP will be found in the amniotic fluid and maternal blood. Blood screening tests for serum AFP can thus be done as a first step in the screening process; if test results are positive, further testing is indicated to diagnose the defect.alpha particles a type of emission produced by the disintegration of a radioactive substance. The atoms of radioactive elements such as uranium and radium are very unstable, continuously breaking apart with explosive violence and emitting particulate and nonparticulate types of radiation. The alpha particles, consisting of two protons and two neutrons, have an electrical charge and form streams of tremendous energy when they are released from the disintegrating atoms. These streams of energy (rays" >alpha rays) can be used in treatment of various malignancies. See also radiation and radiation therapy.α1. First letter of the Greek alphabet, alpha (α), used as a classifier in the nomenclature of many sciences. 2. Symbol for Bunsen solubility coefficient. 3. In chemistry, denotes the first in a series, a position immediately adjacent to a carboxyl group, the first of a series of closely related compounds, an aromatic substituent on an aliphatic chain, or the direction of a chemical bond away from the viewer. 4. Abbreviation for alpha particle. 5. In chemistry, symbol for angle of optic rotation; degree of dissociation. For terms beginning with this prefix, see the specific term.
[α]Symbol for specific optic rotation.
al·pha (al'fă), The spelling alpha is used in chemical names, the spelling alfa in pharmaceutical names.First letter of the Greek alphabet, α.ALPHA Abbreviation for:
Access to Learning for the Public Health Agenda (Medspeak-UK)
Agenda for Leadership in Programs for Healthcare Accreditation (obsolete)
Antenatal Psychosocial Health Assessmentα Abbreviation for alpha.
al·pha (α) (al'fă) 1. First letter of the Greek alphabet; used as a classifier in the nomenclature of many sciences. 2. Bunsen solubility coefficient3. chemistry Denotes the first in a series, a position immediately adjacent to a carboxyl group, the first of a series of closely related compounds, an aromatic substituent on an aliphatic chain, or the direction of a chemical bond away from the viewer. 4. Alpha (α) particle. 5. chemistry Symbol for angle of optic rotation; degree of dissociation. LegalSeeAAlpha
AlphaMeasure of risk-adjusted performance. Some refer to the alpha as the difference between the investment return and the benchmark return. However, this does not properly adjust for risk. More appropriately, an alpha is generated by regressing the security or mutual fund's excess return on the benchmark (for example S&P 500) excess return. The beta adjusts for the risk (the slope coefficient). The alpha is the intercept. Example: Suppose the mutual fund has a return of 25%, and the short-term interest rate is 5% (excess return is 20%). During the same time the market excess return is 9%. Suppose the beta of the mutual fund is 2.0 (twice as risky as the S&P 500). The expected excess return given the risk is 2 x 9%=18%. The actual excess return is 20%. Hence, the alpha is 2% or 200 basis points. Alpha is also known as the Jensen Index. The alpha depends on the benchmark used. For example, it may be the intercept in a multifactor model that includes risk factors in addition to the S&P 500. Related: Risk-adjusted return.Alpha1. The measure of the performance of a portfolio after adjusting for risk. Alpha is calculated by comparing the volatility of the portfolio and comparing it to some benchmark. The alpha is the excess return of the portfolio over the benchmark. It is important to Markowitz portfolio theory and is used as a technical indicator.
2. The excess return that a portfolio makes over and above what the capital asset pricing model estimates.alpha The mathematical estimate of the return on a security when the market return as a whole is zero. Alpha is derived from a in the formula Ri = a + bRm which measures the return on a security (Ri) for a given return on the market (Rm) where b is beta. See also capital-asset pricing model, characteristic line.Alpha.Alpha measures risk-adjusted return, or the actual return an equity security provides in relation to the return you would expect based on its beta. Beta measures the security's volatility in relation to its benchmark index. If a security's actual return is higher than its beta, the security has a positive alpha, and if the return is lower it has a negative alpha. For example, if a stock's beta is 1.5, and its benchmark gained 2%, it would be expected to gain 3% (2% x 1.5 = 0.03, or 3%). If the stock gained 4%, it would have a positive alpha. Alpha also refers to an analyst's estimate of a stock's potential to gain value based on the rate at which the company's earnings are growing and other fundamental indicators. For example, if a stock is assigned an alpha of 1.15, the analyst expects a 15% price increase in a year when stock prices are generally flat. One investment strategy is to look for securities with positive alphas, which indicates they may be undervalued. ALPHA
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| ALPHA➣Alphabetical | | ALPHA➣Association of Local Public Health Agencies | | ALPHA➣Allies Linked for the Prevention of HIV and AIDS (Boise, ID) | | ALPHA➣Antihydrogen Laser Physics Apparatus (experiment at CERN, Geneva, Switzerland) | | ALPHA➣Academy of Learning through Partnerships for Higher Achievement | | ALPHA➣All Life's Problems Have Answers (help organizations) | | ALPHA➣Advanced Learning Program for High Achievers | | ALPHA➣AMC Logistics Program Hardcore | | ALPHA➣Adolescents Learning Positive Health Alternatives | | ALPHA➣Automatic Literature Processing, Handling & Analysis |
alpha
Related to alpha: Alpha maleSynonyms for alphaphrase the alpha and omegaSynonyms- first and last
- be-all and end-all
Words related to alphanoun the 1st letter of the Greek alphabetRelated Words- Greek alphabet
- alphabetic character
- letter of the alphabet
- letter
noun the beginning of a series or sequenceRelated Wordsadj first in order of importanceRelated Wordsadj early testing stage of a software or hardware productRelated Words |