时  间：   2014年12月11日（星期四）下午15:40

地  点：   中心教学楼610

报告一：硕士生报告

时间：15:40-16:10

题  目：Post-Newtonian Approximation of Teleparallel Gravity Coupled with a Scalar Field

报告人： 陈祖成                 指导老师： 韦浩

摘要：We use the parameterized post-Newtonian (PPN) formalism to explore the weak field approximation of teleparallel gravity non-minimally coupling to a scalar field φ, with arbitrary coupling
function ω(φ) and potential V (φ). We find that all the PPN parameters are identical to general relativity (GR), which makes this class of theories compatible with the Solar System experiments. This feature also makes the theories quite different from the scalar-tensor theories, which might be subject to stringent constraints on the parameter space, or need some screening mechanisms to pass the Solar System experimental constraints.

报告二：硕士生报告

时间：16:10-16:40

题  目：    Deposition of diamond-like carbon on inner surface by hollow cathode discharge

报告人： 李世超        指导老师：欧阳吉庭 何锋

摘要：A cylindrical hollow cathode discharge (HCD) in CH4/Ar gas mixture at pressure of 20-30 Pa was used to deposit the diamond-like carbon (DLC) films on the inner surface of stainless steel tube. The characteristics of the HCD including the voltage-current curves, the plasma images and the optical emission spectrum (OES) were measured in Ar and CH4/Ar mixtures. The properties of DLC films prepared under different conditions were analyzed by means of Raman spectroscopy and scanning electron microscopy (SEM). The results show that the electron excitation temperature of HCD plasma is about 2400K. DLC films can be deposited on the inner surface of the tube. The ratio of sp3/sp2 bonds decreases with the voltage supply and the deposition time. The optimizing CH4 content was found to be around CH4/Ar =1/5 for good quality of DLC films in the present system.

报告三：硕士生报告

时间：16:40-17:10

题  目：Research on particle mixture dynamic bulk density under vertical vibration

报告人：念军伟        指导老师： 郑宁

摘要：This paper was an in-depth study on accumulation in the previous research results on static density, That was to study the dynamic packing density in mixture of particles under the condition of vibration. The experimental research was carried ou from two aspects, Firstly studied the evolution 2-D dynamic packing density with time in water and change with acceleration and frequency, then got the change 2-D hybrid particle dynamic packing density of peak to peak value. Finally we studied in different environments, the mixture two particle dynamic packing density of amplitude spectrum.

From the experimental results, we found the the power is obtained in different medium experimental spectra have different responses to the vibration frequency. In the water, It shows a linear relationship that we got the external vibration engery rate with power spectrum curve; While in the air and two-methyl silicone oil, it shows a nonlinear relationship that we got the external vibration engery rate with power spectrum curve, that is the half frequency of external vibration energy and two octave frequency. 

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