In the title compound, C(14)H(9)FN(2), the dihedral angle between the benzene ring and the quinoxaline ring system is 22.2 (3)°. Any aromatic π-π stacking in the crystal must be very weak, with a minimum centroid-centroid separation of 3.995 (2) Å.

In the title salt, C(12)H(11)N(2)O(2) (+)·C(7)H(4)NO(5) (-), the cations and anions inter-act through asymmetric cyclic pyridinium-carboxyl-ate N-H⋯O,O' hydrogen-bonding associations [graph set R(1) (2)(4)], giving discrete heterodimers having weak cation-anion π-π aromatic ring inter-actions [minimum ring centroid separation = 3.7116 (9) Å].

To investigate the influence of fluctuation effects on conditions of microphase separation in two-component incompressible molten block copolymers of complicated chemical structure an altemative and more general fornlulation of the weak crystallization theory is developed using a new variational principle for the calculation of the free

This paper proposes a new preference condition that allows for the separation of decision weights from utility when lotteries over arbitrary sets of outcomes are considered. In the presence of weak order, Jensen-continuity, and stochastic dominance, adding the new probabilistic consistency condition to comonotonic independence leads to rank-dependent utility.

Fetal Electrocardiogram (FECG) is a weak signal through placing the electrodes upon the maternal belly surface to indirectly monitor, which contains all the forms of jamming signal. So, how to separate the FECG from the strong background interference has important value of clinical application. Independent Component Analysis (ICA) is a kind of developed new Blind Source Separation (BSS) technol...

A statistical study of the chromospheric ribbon evolution in H[Formula: see text] two-ribbon flares was performed. The data set consists of 50 confined (62%) and eruptive (38%) flares that occurred from June 2000 to June 2015. The flares were selected homogeneously over the H[Formula: see text] and Geostationary Operational Environmental Satellite (GOES) classes, with an emphasis on including p...

Intrinsic galaxy alignments constitute the major astrophysical systematic of forthcoming weak gravitational lensing surveys but also yield unique insights into galaxy formation and evolution. We build analytic models for the distribution of galaxy shapes based on halo properties extracted from the Millennium Simulation, differentiating between earlyand late-type galaxies as well as central gala...