Yan Yongli

Physical structure features of the crust at southeast region of Tibetan Plateau

Research results show the obvious differences between the crustal deep physical features of each block and fault zone, and obvious inhomogeneity in longitudinal and horizontal directions. The Gandise block is especially outstanding. Squeezed by Indian Continent, the high conductive layer inclines northward, which is continuous in the Gandise block, but becomes horizontal in distribution and thick in Qiangtang and Bayan Har blocks. The Jinshajiang fault zone inclines northward near Yushu, while Lancangjiang and Nujiang fault zones present vertical distributions. Gravity Bouguer anomalies are high at the south and north edges and low in the center of the plateau. The Zayu-Shama region has not reached gravity equilibrium yet and represents obvious negative anomaly, which indicates that the region is in rapid uplift. Its geomagnetic anomaly varies evidently in different blocks and on different fault zones, and decreases obviously both in intensity and amplitude variations from south to north. The surveys and researches of various geophysical methods reflect the spatial distribution features of the blocks and faults in the surveyed area.

Magnetotelluric sounding results in eastern Tibetan Plateau

The results of Zayü-Qingshuihe MT sounding profile carried out in eastern Tibetan Plateau are presented in this paper. Using 2-D RRI method, the resistivity distribution with depth is obtained along the profile. It is featured by the resistivity zones in the horizontal direction and layers in the vertical direction. The Bangong-Nujiang suture zone and Jinshajiang suture zone are both important electrical conductivity-separating zones in the plateau, and the former is a zone with relatively low resistivity while the latter is an electrical conductivity gradient zone. The highly electrical conductive bodies in the mid and lower crust of northern Qiangtang and Bayan Har Terrain might be caused by regional melting due to shear heating during the process of subduction in tectonic evolution.

Research progress on organic micro/nanoscale lasers

Micro/nanoscale lasers that can deliver intense coherent light signals at (sub)wavelength scale have attracted great interest because of their promising applications ranging from on-chip information processing to high-throughput sensing. Compared with traditional inorganic materials, organic materials are ideal platforms to construct high performance microlasers, mainly because of their superiority in flexibly assembled structures for high-quality microcavities and abundant excited-state processes with large active cross sections for high gain emissions. This review begins with an overview of the research evolution of organic microlasers in terms of microcavity resonators and energy-level gain. Then a series of strategies to tailor the microcavity structures and excited-state dynamics of organic materials for the modulation of lasing performances are highlighted. Subsequently, we present the design and construction of organic-microlaser-based hybrid structures with advanced photonic functionalities. In the following part, we introduce their applications in chemical sensing, biosensing and integrated nanophotonics. Finally, we provide our outlook on the current challenges as well as the future direction of organic microlasers. It is anticipated that this review will provide inspiration for the development of miniaturized lasers with desired performances by tailoring of excited-state processes and microcavity structures toward practical applications.