71 research outputs found
External Environment Development of Teaching Staff Construction in Chinese Independent Colleges: Take Chongqing as an Example
Independent colleges have made major contributions to China higher education development. However, with the rapid expansion of Chinese independent colleges, teaching staff construction issues have become more and more obvious, for example, lack of teaching staff construction, structural imbalance, unsteady teaching teams, and low personal quality. This paper takes 7 independent colleges in Chongqing as examples to analyze external environment influencing the construction of independent colleges’ teaching staff construction. At the end of the paper, the authors have given several suggestions for resolving problems occurred during teaching staff construction in independent colleges such as eliminate social prejudice, strengthen personnel laws and regulations construction, increase government support, build colleges and universitie assistance mechanism, establish scientific teaching resource configuration mechanism, and so on
Isospin dependence of projectile-like fragment production at intermediate energies
The cross sections of fragments produced in 140 MeV Ca + Be
and Ni + Be reactions are calculated by the statistical
abration-ablation(SAA) model and compared to the experimental results measured
at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State
University. The fragment isotopic and isotonic cross section distributions of
Ca and Ca, Ni and Ni, Ca and Ni, and
Ca and Ni are compared and the isospin dependence of the
projectile fragmentation is studied. It is found that the isospin dependence
decreases and disappears in the central collisions. The shapes of the fragment
isotopic and isotonic cross section distributions are found to be very similar
for symmetric projectile nuclei. The shapes of the fragment isotopic and
isotonic distributions of different asymmetric projectiles produced in
peripheral reactions are found very similar. The similarity of the
distributions are related to the similar proton and neutron density
distributions inside the nucleus in framework of the SAA model.Comment: 7 pages, 4 figures; to be published in Phys Rev
OFDM Transform-domain Channel Estimation Based on MMSE for Underwater Acoustic Channels
In this paper, we present a method of transform-domain channel estimation for orthogonal frequency division multiplexing (OFDM). The estimator based on minimum mean squared error (MMSE), and a process of FFT and IFFT is added. The system has been tested in a real underwater acoustic channel - the experimental pool in Xiamen University. The experimental result shows that the transform-domain channel estimation has improved the performance of the OFDM system in underwater acoustic channels
Machine learning method for C event classification and reconstruction in the active target time-projection chamber
Active target time projection chambers are important tools in low energy
radioactive ion beams or gamma rays related researches. In this work, we
present the application of machine learning methods to the analysis of data
obtained from an active target time projection chamber. Specifically, we
investigate the effectiveness of Visual Geometry Group (VGG) and the Residual
neural Network (ResNet) models for event classification and reconstruction in
decays from the excited state in C Hoyle rotation band. The
results show that machine learning methods are effective in identifying
C events from the background noise, with ResNet-34 achieving an
impressive precision of 0.99 on simulation data, and the best performing event
reconstruction model ResNet-18 providing an energy resolution of
keV and an angular reconstruction deviation of rad. The
promising results suggest that the ResNet model trained on Monte Carlo samples
could be used for future classifying and predicting experimental data in active
target time projection chambers related experiments.Comment: 9 pages, 10 figures, 9 table
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