Cunbo Fan

Design and development of optoelectronic detecting system for space debris

The paper presents the design and development of a medium-size optoelectronic detecting telescope which will be used for space objects and debris detection. First, the paper introduces the work principle of the detecting system. Then it gives out the design scheme, the main syetem parameters and the fulfillment of the optoelectronic detecting system. And last it shows some results of the system to track the space objects.

Goos–Hänchen shift of the reflected beam in a standing-wave coupled electromagnetically induced transparency system

The Goos–Hanchen shift of the reflected beam in a standing-wave coupled electromagnetically induced transparency medium is investigated. We adopt the three-level Λ system as a model of Rb87 atomic media. Under the influence of two counterpropagating coupling fields, the incident beam is converted into a reflected one, with the Goos–Hanchen shift. We briefly discuss the rules for obtaining efficient reflection in such an atomic system, and carefully investigate the Goos–Hanchen shift and its dependence on the beam width of the incident field. Both the cases with and without Doppler broadening are considered. In order to provide a clearer physical picture on the large shift that could be realized, the concept of penetration depth is used to analyze the shift phenomenologically.

A study on the Fermi resonance of phenol under the effects of pressure and temperature by Raman spectroscopy

The ν1-ν18a Fermi resonance (FR) of phenol were investigated by pressure-dependent Raman spectroscopy from atmospheric up to P=15.2GPa and temperature-dependent Raman spectroscopy from 40 down to T=-180°C, respectively. In the case of pressure, we found the Fermi coupling coefficient W, which were calculated based on the FR theory, exposed a value turnover between 1.912 and 2.244GPa in the process of increasing the pressure. This turnover phenomenon of the Fermi coupling coefficient W has been ascribed to the crystal structure of phenol evolving towards a more symmetric structure with pressure, from a structure like a pseudo-threefold helical chain at ambient pressure to like a ribbon arrangement at 1.912GPa, then to adopt a herringbone arrangement at much higher pressure. On the other hand, we also found the Fermi coupling coefficient W exhibited monotonic reduction without turnover points appearing by decreasing the temperature. The tendencies of the Fermi coupling coefficient W with temperature were in good agreement with the pressure dependence of the Fermi coupling coefficient W in the region of ambient to 1.912GPa, indicating that the effect of pressure and temperature on the FR of phenol in this region might be the same. A conformation evolving induced by pressure and temperature on the ν1 and ν18a FR of phenol have been analyzed.

Singlet pairing gaps of neutrons and protons in hyperonic neutron stars

The

Tunable reflection based on electromagnetically induced transparency

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Performance and progress of daylight tracking for SLR in Changchun station

nucleonic superfluids are investigated within the relativistic mean-field model and Bardeen-Cooper-Schrieffer theory in hyperonic neutron stars. The

Calculation Method for the Bandgap of Antimonide Based Multicomponent Alloys

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Theory study on the bandgap of antimonide-based multi-element alloys

pairing gaps of neutrons and protons are calculated based on the Reid soft-core interaction as the nucleon-nucleon interaction. We have studied particularly the influence of hyperons degrees of freedom on the

The control system of KHz SLR under Windows' XP environment

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Detection algorithm and implement of space objects in star background

nucleonic pairing gap in neutron star matter. It is found that the appearance of hyperons has little impact on baryonic density range and size for the