π Χ - definition. What is π Χ
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%ما هو (من)٪ 1 - تعريف

STAR IN THE CONSTELLATION CYGNUS
Χ Cyg; Χ Cygni; Chi Cyg
  • MM/DD/YY format]]
  • Changes in the visual magnitude, temperature, radius, and bolometric luminosity as χ Cygni pulsates
  • Evolutionary track for an intermediate mass star similar to χ Cygni
  • χ Cygni visualisation
  • Cygnus]] from [[Urania's Mirror]], with χ marked as variable

Pi (letter)         
  • 16px
  • The earliest [[polyamory]] [[pride flag]] design, created by Jim Evans in 1995, in which the lowercase letter π stands for the first letter of polyamory.
SIXTEENTH LETTER OF THE GREEK ALPHABET
Pomega; Pi (symbol); Pi letter; Π (letter); Variant pi; \pi; Πι; ℿ; Pi (Greek); Pi (Greek letter); Pi symbol; Var pi; Varpi
Pi (uppercase Π, lowercase π and ϖ; ) is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive . In the system of Greek numerals it has a value of 80.
Cation–pi interaction         
  • Fig. 1: Examples of π-π. CH-π, and π-cation interactions
  • Fig. 2: The Stoddart synthesis of [2]catenane
  • 275px
  • Cationic [[Acetylcholine]] binding to a [[tryptophan]] residue of the nicotinamide acetylcholine receptor via a cation–π effect.
  • quadrupole]] charge distribution.
  • Binding energy (in kcal/mol) for Na<sup>+</sup> to benzene with prototypical substituents.<ref name="electrostaticmodel" />
  • 450px
  • Cyclophane host–guest complex
  • 450px
  • Cation–π interaction in indole-3-acetic acid choline ester compared to neutral analog
  • 450px
  • Quadrupole moments of benzene and hexafluorobenzene. The polarity is inverted due to differences in electronegativity for hydrogen and fluorine relative to carbon; the inverted quadrupole moment of hexafluorobenzene is necessary for anion-pi interactions.
  • 350px
  • Calculated interaction energies of methylamonium and benzene in a variety of solvents
  • Cyclization of squalene to form hopene
NONCOVALENT MOLECULAR INTERACTION BETWEEN THE FACE OF AN ELECTRON-RICH Π SYSTEM AND AN ADJACENT CATION; EXAMPLE OF NONCOVALENT BONDING BETWEEN A MONOPOLE (CATION) AND A QUADRUPOLE (Π SYSTEM)
Cation-pi interaction; Anion-pi interaction; Anion–pi interaction; Cation-π interaction; Cation–pi interaction
Cation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system (e.g.
Cation–π interaction         
  • Fig. 1: Examples of π-π. CH-π, and π-cation interactions
  • Fig. 2: The Stoddart synthesis of [2]catenane
  • 275px
  • Cationic [[Acetylcholine]] binding to a [[tryptophan]] residue of the nicotinamide acetylcholine receptor via a cation–π effect.
  • quadrupole]] charge distribution.
  • Binding energy (in kcal/mol) for Na<sup>+</sup> to benzene with prototypical substituents.<ref name="electrostaticmodel" />
  • 450px
  • Cyclophane host–guest complex
  • 450px
  • Cation–π interaction in indole-3-acetic acid choline ester compared to neutral analog
  • 450px
  • Quadrupole moments of benzene and hexafluorobenzene. The polarity is inverted due to differences in electronegativity for hydrogen and fluorine relative to carbon; the inverted quadrupole moment of hexafluorobenzene is necessary for anion-pi interactions.
  • 350px
  • Calculated interaction energies of methylamonium and benzene in a variety of solvents
  • Cyclization of squalene to form hopene
NONCOVALENT MOLECULAR INTERACTION BETWEEN THE FACE OF AN ELECTRON-RICH Π SYSTEM AND AN ADJACENT CATION; EXAMPLE OF NONCOVALENT BONDING BETWEEN A MONOPOLE (CATION) AND A QUADRUPOLE (Π SYSTEM)
Cation-pi interaction; Anion-pi interaction; Anion–pi interaction; Cation-π interaction; Cation–pi interaction
Cation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system (e.g.

ويكيبيديا

Chi Cygni

Chi Cygni (Latinised from χ Cygni) is a Mira variable star in the constellation Cygnus, and also an S-type star. It is around 500 light years away.

χ Cygni is an asymptotic giant branch star, a very cool and luminous red giant nearing the end of its life. It was discovered to be a variable star in 1686 and its apparent visual magnitude varies from as bright as 3.3 to as dim as 14.2, corresponding to a brightness factor of over 20,000. It is only visible to the naked eye for a short period near each maximum.