1,145 research outputs found
Responses to Modernity: The Primary Mission and Basic Functions of Chinese University
The start point of modernity is interaction and communication. Any University in the context of post-modern knowledge society and internationalization process, the primary task it faces is the task of interaction, the Chinese University is no exception. Based on the reality of Chinese society needs,Chinese university should also undertake the basic function of combining the China’s demands, market needs with individual interests, and promoting the reconstruction of social order and its healthy development
Jahn-Teller Effect in Systems
The electron-phonon interaction in anions is studied by making use
of a lattice relaxation approach. We find there exists a Jahn-Teller effect in
system, due to an extra electron being doped to the double
degenerate state. As a result of this effect, the original
symmetry of the ground state becomes unstable, which causes distortion
of the lattice configuration. The only symmetry maintained in the final state
of the relaxation is the plane reflection symmetry. We further find that
besides the Jahn-Teller active modes, the
non-Jahn-Teller active vibrations also contribute to the relaxation
process, which come from the nonlinear effect and are two or three orders
smaller than those of the Jahn-Teller active modes. We suggest that the
molecule is a promising Berry Phase candidate in this effective
Jahn-Teller system.Comment: 14 pages, to appear in Mod. Phys. Lett. B (1997
Finite element method for obtaining the regularized photon Green function in lossy material
Photon Green function (GF) is the vital and most decisive factor in the field
of quantum light-matter interaction. It is divergent with two equal space
arguments in arbitrary-shaped lossy structure and should be regularized. We
introduce a finite element method for calculating the regularized GF. It is
expressed by the averaged radiation electric field over the finite-size of the
photon emitter. For emitter located in homogeneous lossy material, excellent
agreement with the analytical results is found for both real cavity model and
virtual cavity model. For emitter located in a metal nano-sphere, the
regularized scattered GF, which is the difference between the regularized GF
and the analytical regularized one in homogeneous space, agrees well with the
analytical scattered GF
DlncRNALoc: A discrete wavelet transform-based model for predicting lncRNA subcellular localization
The prediction of long non-coding RNA (lncRNA) subcellular localization is essential to the understanding of its function and involvement in cellular regulation. Traditional biological experimental methods are costly and time-consuming, making computational methods the preferred approach for predicting lncRNA subcellular localization (LSL). However, existing computational methods have limitations due to the structural characteristics of lncRNAs and the uneven distribution of data across subcellular compartments. We propose a discrete wavelet transform (DWT)-based model for predicting LSL, called DlncRNALoc. We construct a physicochemical property matrix of a 2-tuple bases based on lncRNA sequences, and we introduce a DWT lncRNA feature extraction method. We use the Synthetic Minority Over-sampling Technique (SMOTE) for oversampling and the local fisher discriminant analysis (LFDA) algorithm to optimize feature information. The optimized feature vectors are fed into support vector machine (SVM) to construct a predictive model. DlncRNALoc has been applied for a five-fold cross-validation on the three sets of benchmark datasets. Extensive experiments have demonstrated the superiority and effectiveness of the DlncRNALoc model in predicting LSL
Development of an UAS for Earthquake Emergency Response and Its Application in Two Disastrous Earthquakes
To support humanitarian action after a disaster, we require reliable data like high-resolution satellite images for analyses aimed to define the damages of facilities and/or infrastructures. However, we cannot obtain satellite images in few days after an event. Thus, in situ surveys are preferred. Advances in unmanned aircraft system (UAS) have promoted them to become precious tools for capturing and assessing the extents and volume of damages. Safety, flexibility, low cost, and ease of operation make UAS suitable for disaster assessment. In this chapter, we developed an example of UAS for swiftly acquiring disaster information. With the selected fixed-wing UAS, we successfully performed data acquisition at specified scales. For the image analysis, we applied a photogrammetric workflow to deal with the very high resolution of the images obtained without ground control points. The results obtained from two destructive earthquakes demonstrated that the presented system plays a key role on the processes of investigating and gathering information about a disaster in the earthquake epicentral areas, like road detection, structural damage survey, secondary disaster investigation, and quick disaster assessment. It can effectively provide disaster information in hardly entered areas to salvation headquarters for rapidly developing the relief measures
(S)-Ethyl 1,2,3,9-tetrahydropyrrolo[2,1-b]quinazoline-1-carboxylate
The title chiral compound, C14H16N2O2, was prepared by esterification of (S)-1,2,3,9-tetrahydropyrrolo[2,1-b]quinazolin-1-carboxylic acid in the presence of HCl/EtOH. In the molecule, the quinazoline ring is non-planar and exhibits a distorted half-chair conformation, while the five-membered ring shows a typical envelope conformation. Intermolecular C—H⋯N hydrogen bonding helps to stabilize the crystal structure
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