Convenient and simple procedures for the synthesis of functionalized Quinoxaline derivatives were developed via one-pot four-component reaction of o-aminoanilin, acetylenic ester, and malonyl dichloride in the presence of K2 CO3 as effective base catalyst. These compounds widely are used in various industries like paint, pharmaceutical and medicine. Quinoxaline derivatives are also part of anti...

Previous studies have rarely examined how temporal dynamic patterns, event-related coherence, and phase-locking are related to each other. This study assessed reaction-time-sorted spectral perturbation and event-related spectral perturbation in order to examine the temporal dynamic patterns in the frontal midline (F), central parietal (CP), and occipital (O) regions during a chemistry working m...

The Chandra HETGS spectra of the Seyfert 1 galaxy MCG–6-30-15 show numerous narrow, unresolved (FWHM ∼ < 200 km s −1) absorption lines from a wide range of ionization states of N, O, Mg, Ne, Si, S, Ar, and Fe. The initial analysis of these data, presented in Lee et al. (2001), shows that a dusty warm absorber model adequately explains the spectral features ∼ > 0.48 keV (∼ < 26Å). We attribute p...

Copper (II) complexes of three phosphonate ligands were prepared and fully characterized by elemental analysis, spectral and thermal studies. The IR spectral data showed that the phosphonate compounds behave as bidentate ligands coordinating to the copper ion through the P=O and NH groups. The electronic spectroscopic data support a distorted octahedral geometry around copper ion. The activity ...

A new series of substituted quinoline and pyridine derivatives 6a-h are synthesized by the coupling of hydrazide derivatives 4a-b with substituted carboxylic acids 5a-c in the presence of N,N,N’,N’-tetramethyl-o-(benzotriazol-1-yl) uranium tetrafluoroborate TBTU as a coupling agent and lutidine as a base. The newly synthesized compounds 6a–l is characterized by analytical NMR and mass spectral ...

Hyperspectral anomaly detection is one of the main challenging topics in both military and civilian fields. The spectral information contained in a hyperspectral cube provides a high ability for anomaly detection. In addition, the costly spatial information of adjacent pixels such as texture can also improve the discrimination between anomalous targets and background. Most studies miss the wort...

We propose a simple fast spectral method for the Boltzmann collision operator with general collision kernels. In contrast to the direct spectral method [17, 28] which requires O(N) memory to store precomputed weights and has O(N) numerical complexity, the new method has complexity O(MN logN), where N is the number of discretization points in each of the three velocity dimensions and M is the to...

A spectral sparsifier of a graph G is a sparser graph H that approximately preserves the quadratic form of G, i.e. for all vectors x, xLGx ≈ x T LHx, where LG and LH denote the respective graph Laplacians. Spectral sparsifiers generalize cut sparsifiers, and have found many applications in designing graph algorithms. In recent years, there has been interest in computing spectral sparsifiers in ...