The investigation of time-varying synchrony of EEG during sentence learning using wavelet analysis

The synchrony analysis has been used as a tool for the purpose of investigating how the cognitive processes take place between different brain regions when the specified learning task is going on. We propose a novel method based on the time-frequency representation for quantifying synchronization between two channel EEG with both temporal and spectral resolution. The presented method employed the wavelet transform for cross coherent spectral analysis of the EEG signals recorded during sentences recognizing and learning. The wavelet-coherent magnitude spectra provide the information indicating the degree of coherence and the cross-wavelet phase relation serves to indicate the direction of information flow between two EEG channels on different cortical regions. Real EEG recordings are collected based on a cognitive target. It is observed from both the magnitude spectra and phase of the wavelet coherence that there are obvious differences between the identification of both Chinese and English sentences. These are helpful for the research on the English study for Chinese students.published_or_final_versio

Control and operation of a new 8/6-pole doubly salient permanent-magnet motor drive

This paper proposes a new 8/6-pole doubly salient permanent-magnet (DSPM) motor drive, which offers the advantages of higher power density, higher efficiency, and wider speed range. The corresponding control and operation of the motor drive are presented. A variable proportional-integral (PI) controller combined with bang-bang control for the DSPM motor drive is developed. Two operation modes, namely, four-phase and two-phase operation modes, are proposed for the 8/6-pole DSPM motor drive. The drive system is implemented and tested. The results show that the developed control scheme can operate the DSPM motor properly, and the DSPM motor drive offers high efficiency over wide power range and good dynamic performance. Furthermore, the two-phase operation mode of the 8/6-pole DSPM motor offers the possibility of eliminating the torque ripple of the motor drive.published_or_final_versio

Filling the missing gaps on research in Chinese adolescents (Editorial)

published_or_final_versio

A practical guide to density matrix embedding theory in quantum chemistry

Density matrix embedding theory (DMET) provides a theoretical framework to treat finite fragments in the presence of a surrounding molecular or bulk environment, even when there is significant correlation or entanglement between the two. In this work, we give a practically oriented and explicit description of the numerical and theoretical formulation of DMET. We also describe in detail how to perform self-consistent DMET optimizations. We explore different embedding strategies with and without a self-consistency condition in hydrogen rings, beryllium rings, and a sample S$_{\text{N}}$2 reaction. The source code for the calculations in this work can be obtained from \url{https://github.com/sebwouters/qc-dmet}.Comment: 41 pages, 10 figure

Enrichment of committed, chondroitin sulfate-expressing human nucleus pulposus cells over progenitors under alginate encapsulation

INTRODUCTION: Accumulating evidence has suggested a heterogeneous NP cell population in adult human IVDs [1, 2], possibly a result of cells being at different differentiation states. The heterogeneous cell populations include the primitive NP cells (also regarded as notochordal NP cells) [1, 2], mature NP cells, and local disc progenitors [1] with various capacities in proteoglycan production other than chondrocytic NP cells. Cross-linked alginate hydrogel provides a favorable three-dimensional microenvironment for promotion of chondrogenic phenotype [3] with enhanced biosynthesis of proteoglycans (PGs) and collagen II. It has been widely used as a bioactive scaffold for engineering of ...postprin