用分光计测量三棱镜的折射率的几个问题

本文对分光计的调整、三棱镜的折射率的测量及数据处理过程中常出现的几个问题作详细的分析,提出了最简单的调节方法,澄清了一些易混淆的问题,可以避免盲目的操作,达到该实验的训练目的。     

Misidentification or Identification Rates for Four Kinds of Particles on BES-II

Using the data samples collected at and around the center-of-mass energies of 3.097 GeV and 3. 773 GeV with the BES-Ⅱ detector at the BEPC collider, we select the pure particle samples of muon, electron, kaon and pion, and their mutual （mis）identification rates are also obtained.     

Direct Measurement of Branching Fraction for Inclusive Semimuonic Decay of Neutral D Mesons

Using a data sample of about 33pb^-1 collected at and around √s = 3.773 GeV with the BES-Ⅱ detector at the BEPC, we have directly measured the branching fraction for inclusive semimuonic decay of neutral D mesons to be BF（D^0 → μ^＋X） = （7.2 ± 1.5 ± 0.8）%.     

A Dark Energy Model with Higher Derivative and Cosmological Evolution

We construct dark energy models which have high derivative terms. In the framework of a single scalar field model with a higher derivative, the equation of state （EOS） ω might have some special character in the evolvement, which states that the universe will evolve in some interesting ways. We study the different kinds of dark energy models, and classify them into several genera by their character in the evolvement.