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p20

1. p20-ARC One of the subunits of ARP2/3. 2. p20-CGGBP (CGG-binding protein1) A protein that binds to the unmethylated form of the trinucleotide repeat ...

Platonic solid

Platonic solid  

A convex polyhedron is regular if all its faces are alike and all its vertices are alike. More precisely, this means that(i) all the faces are regular polygons having the same number p of edges, ...
equiangular spiral

equiangular spiral  

A curve whose equation in polar coordinates is r=aekθ, where a (>0) and k are constants. Let O be the origin and P be any point on the curve. The curve derives its name from the property that the ...
birthday problem

birthday problem  

A well-known, but intriguing probability problem. There are n people in a room. Assume that none is born on 29 February and that the remaining 365 days are all equally likely as birthdays. What is ...
modal logic

modal logic  

A logic studying the notions of necessity and possibility. Modal logic was of great importance historically, particularly in the light of various doctrines concerning the necessary properties of the ...
bipolar transistor

bipolar transistor  

A semiconductor device having three electrodes: emitter, base, and collector. It is effectively a sandwich of two types of doped semiconductor, usually p-type and n-type silicon, and so contains two ...
Ponzi scheme

Ponzi scheme  

A type of banking fraud named after Charles Ponzi, who operated such a scheme in the USA in 1920. Depositors are offered unsustainably high rates of interest (e.g. 50% p.a.) and are initially paid ...
binomial distribution

binomial distribution  

The discrete probability distribution for the number of successes when n independent experiments are carried out, each with the same probability p of success. The probability mass function is given ...
bookmark

bookmark  

1 A marker placed in a document to allow easy access to that point.2 A link to a URL stored on a computer (e.g. in a ‘favorites list’) so that the user may easily access it.
hertz

hertz  

The SI unit of frequency, abbreviated to ‘Hz’. Normally used to measure the frequency of cycles, or oscillations, one hertz is equal to one cycle per second.
Box-Jenkins model

Box-Jenkins model  

A method for time-series forecasting in econometrics. It was introduced by the statisticians George Box and Gwilym Jenkins in 1970.
exponential smoothing

exponential smoothing  

An econometric technique in which greater weight is accorded to more recent data in order to identify emerging trends.
XML

XML  

A simplified form of SGML. See feature XML. See also SAX, SOAP, XPATH, XQUERY.http://www.w3.org/XML The W3C's XML page
group accounts

group accounts  

An account associated with a group of users. Group accounts can be used to associate a series of access controls with a group of users: for example, ensuring that the group can only read or write to ...
gradient

gradient  

In meteorology, the rate of change of a function (e.g. pressure or temperature), at right angles to the isolines.
URL

URL  

(orAbbrev. for universal (or uniform) resource locator. The address system used on the Internet, for example, to specify the location of documents in the World Wide Web. For ...
logarithm

logarithm  

The logarithm to base a(>0) of a positive number b is denoted by loga b=x, where ax=b. Logarithms have the fundamental property loga (bc)=loga b+loga c. A logarithm to base 10 is usually denoted by ...
operations research

operations research  

(operational research, OR)The study of some human operation or set of operations by quantitative means. It is usually conducted with the aid of computer modeling; models may be hypothesized and ...
sign test

sign test  

A simple non-parametric test that is used in two situations:1. A random sample of n observations x1, x2,…, xn is taken on the random variable X; the null hypothesis is that the population has median ...
interface

interface  

The zone of interaction between two systems or processes. Estuaries are interfaces between fluvial and marine systems (Bate et al. (2002) Water SA 28, 3).
autocorrelation

autocorrelation  

If {x i} is an ordered sequence of observations then the product moment correlation coefficient between pairs (x i, x i+1) is the autocorrelation of lag 1, and between pairs (x i, x i+k) is the ...

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