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Free energy diagram of n-butane as a function of dihedral angle. In stereochemistry, a torsion angle is defined as a particular example of a dihedral angle, describing the geometric relation of two parts of a molecule joined by a chemical bond. [4] [5] Every set of three non-colinear atoms of a molecule defines a half-plane. As explained above ...
The polar angle may be called inclination angle, zenith angle, normal angle, or the colatitude. The user may choose to replace the inclination angle by its complement , the elevation angle (or altitude angle ), measured upward between the reference plane and the radial line—i.e., from the reference plane upward (towards to the positive z-axis ...
Delta Sigma Theta was the first national African-American organization to collaborate with Habitat for Humanity International in 1992, during National President Bertha Roddey's administration. [64] Habitat for Humanity builds and rehabilitates homes with the help of selected homeowners, volunteer labor, management expertise, and tax-deductible ...
Sigma Theta Epsilon is the result of the merger of Methodist-affiliated fraternities in 1941: Phi Tau Theta, founded in 1925, and Sigma Epsilon Theta, founded in 1936 at Indiana University. The merged fraternity was initially called Delta Sigma Theta, but the name was changed to Sigma Theta Epsilon in 1949 when a national sorority Delta Sigma ...
Pi Kappa Lambda was established on May 17, 1918, at the Northwestern University by faculty members Carl Milton Beecher, Louis Norton Dodge, and Walter Allen Stults. [1] The first member was Peter Christian Lutkin, dean of the School of Music at Northwestern University, and the Greek letters chosen for the name of the society were based on his initials.
The torsion constant or torsion coefficient is a geometrical property of a bar's cross-section. It is involved in the relationship between angle of twist and applied torque along the axis of the bar, for a homogeneous linear elastic bar. The torsion constant, together with material properties and length, describes a bar's torsional stiffness.
The official song was the "Phi Sigma Delta Hymn", generally known as "We Sing To Thee, Phi Sigma Delta." It was adopted in 1930. [2] Another song written for the fraternity, c.1923, was "Phi Sigma Delta Forever," words by Herbert Morse & Herman Block and music by Nathan Grabin & Herman Block. Its quarterly magazine was The Deltan. [5]
Founded on January 13, 1913, at Howard University by twenty-two visionary collegiate students, Delta Sigma Theta is the first African American Greek-lettered organization for women based on the principles of servings others and political activity. Delta Sigma Theta held its first national convention in 1919 in Washington, D.C.