Tsinghua University

State Grid Corporation of China

Jianfeng Yan

Wei Zhang

Yue Zhao

Fang Li

Lan Jiang

Fang Tian

Gang Duan

Yu Dong

Jingtao Wu

Dezhi Zhu

Jiachen Yu

Yaozhong Xin

Hongzhu Tao

Jiaqun Li

Provided is a femtosecond laser system for processing a micro-hole array, comprising: a femtosecond laser, a half-wave plate, a polarizer, a concave lens, a convex lens, a diaphragm, a mechanical shutter, a phase-type spatial light modulator, a first plano-convex lens, a reflecting mirror, a second plano-convex lens, a dichroic mirror, a camera, a processing objective lens, a six-axis translation stage and a transmissive white light source.

Femtosecond laser system for processing micro-hole array

Provided are a protein-matrix microlens array diffraction device and a preparation method thereof. The protein-matrix microlens array diffraction device includes a matrix of a protein crystal. A largest side of the protein crystal has a length of 100 to 500 &#x3bc;m, a surface of the protein crystal where the largest side is located is processed to have an array of microlens-like protrusions, a distance p between two adjacent microlens-like protrusions of the array of microlens-like protrusions is in a range of 10 to 100 &#x3bc;m, a diameter d of the microlens-like protrusion is in a range of 2 to 10 &#x3bc;m, and a height h of the microlens-like protrusion is in a range of 0.05 to 2 &#x3bc;m.

Protein-matrix microlens array diffraction device and method for preparing the same

Provided is a method for preparing gold nanorods having a high catalytic activity by using a femtosecond laser. The method includes: (1) preparing a gold seed solution; (2) preparing a gold nanorod solution by a seed solution growth process; (3) subjecting the gold nanorod solution to a centrifugal separation to obtain the gold nanorods, and dropping the gold nanorods on a silicon substrate; (4) building a system for preparing the gold nanorods having the high catalytic activity by using the femtosecond laser; and (5) emitting a pulse of the femtosecond laser on the silicon substrate, to allow an electric field distribution of a surface of the gold nanorod on the silicon substrate to change, to partially exfoliate atoms on the surface of the gold nanorod, thereby obtaining the gold nanorod with the high catalytic activity.

Method for preparing gold nanorods having high catalytic activity by using femtosecond laser

A method and a system for a comprehensive analysis of low frequency oscillation. The method includes: firstly, initiating a wide area measurement system WAMS () to perform real-time monitoring; transmitting real-time low frequency oscillation information to a dynamic early-warning system () periodically; then converting the low frequency oscillation information received by the dynamic early-warning system () into an input file for stability calculation with small disturbance, and performing related calculation; finally, transmitting the calculated result back to the wide area measurement system WAMS () and a human-machine system interface for output. The system includes: the wide area measurement system WAMS (), the dynamic early-warning system (), a system for stability calculation with small disturbance () and an output system ().

Method and system for a comprehensive analysis of low frequency oscillation

Growing community of inventors

Beijing, China

Jianfeng Yan