宇宙加速膨胀与天文观测

宇宙加速膨胀深刻地影响了现代宇宙学研究,同时对于基础物理也提出了重大的挑战。它的发现荣获了2011年的诺贝尔物理学奖。     

Strongly Lensed Transient Sources: A Review

The past decades have witnessed a lot of progress in gravitational lensing with two main targets:stars and galaxies(with active galactic nuclei).The success is partially attributed to the continuous luminescence of these sources making the detection and monitoring relatively easy.With the running of ongoing and upcoming large facilities/surveys in various electromagnetic and gravitational-wave bands,the era of time-domain surveys would guarantee constant detection of strongly lensed explosive tr...     

利用强引力透镜检验宇宙距离对偶关系

宇宙学近年来发展迅速,人们对宇宙的物质组份、宇宙的形成与演化等都有了更加精准而深刻的认识。这些很大程度上都得益于对宇宙学距离的测量。     

基于光丝效应的飞秒激光单次高质量直接切割薄石英玻璃工艺研究(特邀)

提出了一种基于光丝效应的利用高重频飞秒激光结合高速扫描振镜对200μm石英玻璃进行单次直接切割的方法.优化加工工艺参数,实现了薄石英玻璃的快速高质量切割,加工速度可以达到10 mm/s,崩边小于7.5μm,断面粗糙度小于1μm.该方法实现了薄玻璃切割效率和质量的同步提升,在激光加工领域有较好的应用前景.     

Joule-Thomson Coefficient for Strongly Interacting Unitary Fermi Gas

The Joule-Thomson effect reflects the interaction among constituent particles of macroscopic system. For classical ideal gas, the corresponding .Joule-Thomson coefficient is vanishing while it is non-zero for ideal quantum gas due to the quantum degeneracy. In recent years, much attention is paid to the unitary Fermi gas with infinite two-body scattering length. According to universal analysis, the thermodynamical law of unitary Fermi gas is similar to that of non-interacting ideal gas, which can be explored by the virial theorem P = 2E/3V. Based on previous works, we further study the unitary Fermi gas properties. The effective chemical potential is introduced to characterize the nonlinear levels crossing effects in a strongly interacting medium. The changing behavior of the rescaled Joule-Thomson coefficient according to temperature manifests a quite different behavior from that for ideal Fermi gas.