The title mol-ecule, C(13)H(8)N(4), is is essentially planar [r.m.s. deviation for all non-H atoms = 0.025 (3) Å]. In the crystal, mol-ecules are connected through one weak bifurcated N-H⋯(N,N) hydrogen bond and three π-π stacking inter-actions between pyridine and imidazole rings [centroid-centroid distance = 3.631 (8) Å] and between pyridine and benzene rings [centroid-centroid distances = 3....

In the title compound, C(13)H(12)N(4)O(6), the mean plane through the nitro-benzene forms a dihedral angle of 37.38 (15)° with the plane through the imidazole ring. The crystal packing is stabilized by weak inter-molecular C-H⋯O and C-H⋯N inter-actions together with π-π stacking inter-actions between nitro-benzene rings [centroid-centroid distance = 3.788 (3) Å] and between imidazole rings [cen...

The nearest shrunken centroid classifier uses shrunken centroids as prototypes for each class and test samples are classified to belong to the class whose shrunken centroid is nearest to it. In our study, the nearest shrunken centroid classifier was used simply to select important genes prior to classification. Random Forest, a decision tree based classification algorithm, is chosen as a classi...

in this work, a direct design approach for designing a surface shape (inverse design problem) has been developed, in which both the target surface pressure and the unknown nodal coordinates appear explicitly in the formulations. the final discretized form of the governing equations (unified formulation) can be used for both analysis and shape design problems. in this work, shape design problems...

In recent years we have seen a tremendous growth in the volume of text documents available on the Internet, digital libraries, news sources, and company-wide intranets. Automatic text categorization, which is the task of assigning text documents to pre-specified classes (topics or themes) of documents, is an important task that can help both in organizing as well as in finding information on th...

In the title compound, C(29)H(22)O(4), the chromene ring is almost planar with a small puckering [0.143 (2) Å]. The crystal structure is stabilized by C-H⋯O and C-H⋯π inter-actions. Edge-to-face (centroid-centroid distances of 3.894 and 3.673 Å) and face-to-face (centroid-centroid distance of 3.460 Å) π-π-ring electron inter-actions are also observed.

In either of the two independent mol-ecules within the asymmetric unit of the title compound, [Ni(C(16)H(15)NO(3))(C(3)H(4)N(2))], the Ni(II) atom is coordinated by the two N atoms and two O atoms in a distorted square-planar geometry. The crystal packing is stabilized by strong and weak inter-molecular C-H⋯O hydrogen bonds, as well as weak centroid-centroid π-stacking inter-actions [centroid-c...

Using the spatial cueing technique, this study demonstrates that the center of mass (centroid) of a visual scene has a special ability to attract attention even when there is no object presented at this location. Four boxes formed an imaginary square and were presented to the left or right hemifield. After the cueing in one box, a target appeared in one of the four boxes and, in addition, at ce...

The centroid decomposition, an approximation for the singular value decomposition, had a long history among the statistics/psychometrics community for factor analysis research. We revisit the centroid method first in its original context of factor analysis and then adapt it to other than a covariance matrix. The centroid method can be cast as an O(n)-step ascent method on a hypercube. It is sho...