295 research outputs found
Some identities involving the k-th power complements
The main purpose of this paper is using the elementary method to study the calculating problem of one kind infinite series involving the k-th power complements, and obtain several interesting identities
2-(4-Bromophenyl)-3,4-dihydroisoquinolin-2-ium thiocyanate hemihydrate
In the title hemihydrated salt, C15H13BrN+·NCS−·0.5H2O, the two benzene rings are aligned at a dihedral angle of 46.9 (1)°. The six-membered heterocycle of the dihydroisoquinoline unit adopts a half-chair conformation. The water molecule and thiocyanate ion are linked by O—H⋯N hydrogen bonds, generating a four-membered ring motif. In addition, C—H⋯O and C—H⋯S interactions link the components into a chain along the c axis. π–π interactions [centroid–centroid distance = 3.974 (2) Å] link the chains into sheets and further π—π [centroid–centroid distance = 3.746 (2) Å] and C—H⋯π interactions give rise to a three-dimensional nework
2-(4-Iodophenyl)-1,2,3,4-tetrahydroisoquinoline-1-carbonitrile
In the title compound, C16H13IN2, the benzene ring of the tetrahydroisoquinoline moiety makes a dihedral angle of 45.02 (9)° with the benzene ring of the 4-iodophenyl fragment. The N atom and the adjacent unsubstituted C atom of the tetrahydroisoquinoline unit are displaced by 0.294 (2) and 0.441 (3) Å, respectively, from the plane through the remaining eight C atoms. In the crystal, pairs of adjacent molecules are linked into dimers by weak intermolecular C—H⋯π interactions
Efficient Geometric Correction Workflow for Airborne Hyperspectral Images through DEM-Driven Correction Techniques
Geometric correction, a pivotal step in the preprocessing of airborne remote sensing imagery, is critical for ensuring the accuracy of subsequent quantitative analyses. Achieving precise and efficient geometric correction for airborne hyperspectral data remains a significant challenge in the field. This study presents a new method for system-level and fine-scale geometric correction of uncontrolled airborne images utilizing DEM data, which integrates forward and inverse transformation algorithms. Furthermore, an optimized workflow is proposed to facilitate the processing of large-scale hyperspectral datasets. The effectiveness of the proposed method is demonstrated through an application analysis using airborne HyMap imagery, with experimental outcomes indicating high application accuracy and enhanced processing efficiency
GEmo-CLAP: Gender-Attribute-Enhanced Contrastive Language-Audio Pretraining for Speech Emotion Recognition
Contrastive learning based pretraining methods have recently exhibited
impressive success in diverse fields. In this paper, we propose GEmo-CLAP, a
kind of efficient gender-attribute-enhanced contrastive language-audio
pretraining (CLAP) model for speech emotion recognition. To be specific, we
first build an effective emotion CLAP model Emo-CLAP for emotion recognition,
utilizing various self-supervised learning based pre-trained models. Then,
considering the importance of the gender attribute in speech emotion modeling,
two GEmo-CLAP approaches are further proposed to integrate the emotion and
gender information of speech signals, forming more reasonable objectives.
Extensive experiments on the IEMOCAP corpus demonstrate that our proposed two
GEmo-CLAP approaches consistently outperform the baseline Emo-CLAP with
different pre-trained models, while also achieving superior recognition
performance compared with other state-of-the-art methods.Comment: 5 page
2-(2-Hydroxyphenyl)-3,4-dihydroisoquinolin-1(2H)-one
There are two independent molecules in the asymmetric unit of the title compound, C15H13NO2, in both the six-membered dihydropyridine rings adopt a half-chair conformation. The two benzene rings make dihedral angles of 43.66 (10) and 62.22 (10)° in the two molecules. In the crystal, the two independent molecules are linked alternately by intermolecular O—H⋯O hydrogen bonds, forming a zigzag chain along the c axis. Furthermore, intermolecular C—H⋯π interactions link the chains into a three-dimensional network
4,4′,6,6′-Tetramethyl-2,2′-bipyrimidine hexahydrate
In the title compound, C12H14N4·6H2O, the two pyrimidine rings make a dihedral angle of 5.285 (6)°. Intermolecular O—H⋯O hydrogen bonds link the six water molecules, generating edge-fused four-, five- or six-membered ring motifs and forming two-dimensional sheets. The sheets are stabilized by the formation of O—H⋯N hydrogen bonds between the water molecules and the bipyrimidine molecules, resulting in a three-dimensional network
2-(2-Iodophenyl)-1,2,3,4-tetrahydroisoquinoline-1-carbonitrile
In the title compound, C16H13IN2, the two benzene rings make a dihedral angle of 67.26 (5)°. The six-membered heterocycle of the tetrahydroisoquinoline unit adopts a half-chair conformation. In the crystal, adjacent molecules are linked by pairs of weak intermolecular C—H⋯N hydrogen bonds, forming inversion dimers. An intramolecular C—H⋯I close contact is also observed
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