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2 天前 · The sine and cosine functions are commonly used to model periodic phenomena such as sound and light waves, the position and velocity of harmonic oscillators, sunlight intensity and day length, and average temperature variations throughout the year. They can be traced to the jyā and koṭi-jyā functions used in Indian astronomy during the Gupta period .
5 天前 · Pearson correlation coefficient. Several sets of ( x , y) points, with the correlation coefficient of x and y for each set. The correlation reflects the strength and direction of a linear relationship (top row), but not the slope of that relationship (middle), nor many aspects of nonlinear relationships (bottom).
4 天前 · Principal component analysis ( PCA) is a linear dimensionality reduction technique with applications in exploratory data analysis, visualization and data preprocessing . The data is linearly transformed onto a new coordinate system such that the directions (principal components) capturing the largest variation in the data can be easily identified.
3 天前 · Electrical conductivity (or specific conductance) is the reciprocal of electrical resistivity. It represents a material's ability to conduct electric current. It is commonly signified by the Greek letter σ ( sigma ), but κ ( kappa) (especially in electrical engineering) [citation needed] and γ ( gamma) [citation needed] are sometimes used. The SI unit of electrical conductivity is siemens ...
5 天前 · Entropy is central to the second law of thermodynamics, which states that the entropy of an isolated system left to spontaneous evolution cannot decrease with time. As a result, isolated systems evolve toward thermodynamic equilibrium, where the entropy is highest.
5 天前 · Website. cia .gov. The Central Intelligence Agency ( CIA) / ˌsiː.aɪˈeɪ /, known informally as the Agency [6] and historically as the Company, [7] is a civilian foreign intelligence service of the federal government of the United States tasked with gathering, processing, and analyzing national security information from around the world ...
1 天前 · Denmark ( Danish: Danmark, pronounced [ˈtænmɑk] ⓘ) is a Nordic country in the south-central portion of Northern Europe. It is the metropolitan part of and the most populous constituent of the Kingdom of Denmark, [N 8] a constitutionally unitary state that includes the autonomous territories of the Faroe Islands and Greenland in the North Atlantic Ocean. [14] Metropolitan Denmark [N 9] is ...
