Chinese Academy of Sciences

Shengfa Liang

Ming Liu

Changqing Xie

Dongmei Li

Hao Zhang

Xiaojing Li

Qing Luo

Xin Chen

Shuang Zhan

Yu Liu

Lei Zhou

Jiebin Niu

Peiwen Zhang

Hongzhang Yang

The present disclosure provides a method for cleaning a lanthanum gallium silicate wafer which comprises the following steps: at a step of 1, a cleaning solution constituted of phosphorous acid, hydrogen peroxide and deionized water is utilized to clean the lanthanum gallium silicate wafer with a megahertz sound wave; at a step of 2, the cleaned lanthanum gallium silicate wafer is rinsed and dried by spinning; at a step of 3, a cleaning solution constituted of ammonia, hydrogen peroxide and deionized water is utilized to clean the lanthanum gallium silicate wafer with the megahertz sound wave; at a step of 4, the cleaned lanthanum gallium silicate wafer is rinsed and dried by spinning; and at a step of 5, the rinsed and dried wafer is placed in an oven to be baked. The present invention shortens a period of acidic cleaning process and prolongs a period of alkaline cleaning and utilizes a more effective cleaning with megahertz sound wave to replace the conventional ultrasonic cleaning to solve the issue of cleaning the lanthanum gallium silicate wafer after a cutting process and to improve surface cleanliness of the lanthanum gallium silicate wafer to get a better cleaning effect.

Method for cleaning lanthanum gallium silicate wafer

A sampler adapted to a one-dimension slow-varying signal, including: a signal preprocessing unit configured to preprocess an input signal; a slope-controllable sawtooth wave signal generating unit configured to generate a slope-controllable sawtooth wave signal and perform zero-resetting; a signal comparing unit configured to compare the preprocessed input signal from the signal preprocessing unit with the sawtooth wave signal and to output a pulse signal to the generating unit and a signal outputting unit when the preprocessed input signal is equal to the sawtooth wave signal; a counting unit configured to count a number of clock signals while the sawtooth wave signal generating unit is generating the sawtooth wave signal and to transmit the counted number to the signal outputting unit; the signal outputting unit configured to, upon receipt of the pulse signal output from the signal comparing unit, output the number counted by the counting unit at the moment.

Random sampler adapted to one-dimension slow-varying signal

A method for manufacturing an NOgas sensor for detection at room temperature comprises: manufacturing a metal electrode on a surface of a flexible substrate; manufacturing an SWCNTs/SnOsensitive film; and bonding the SWCNTs/SnOsensitive film with a portion of the surface of the flexible substrate with the metal electrode, so as to form the NOgas sensor for detection at room temperature. The present disclosure solves the problems of the poor adhesion between the sensitive material and the flexible substrate, and a non-uniform distribution, and achieves the purposes of secure bonding between the sensitive material and the flexible substrate, and uniform distribution.

[object Object]

A method for collecting a signal with a frequency lower than a Nyquist frequency includes, by a data transmitting end, selecting a suitable transformation base matrix for an input signal, deriving a sparse representation of the signal using the transformation base matrix to determine a sparsity of the signal, calculating a number M of compressive sampling operations according to the sparsity, sampling the signal with fusing M channels, and integrating sampling values of each channel to obtain M measurement values. A reconstruction end reconstructs an original signal by solving optimization problems. Based on theory, compressive sampling can be performed on a sparse signal or a signal represented in a sparse manner with a frequency much lower than the Nyquist frequency, overcoming restrictions of the typical Nyquist sampling theorem. The method can be implemented simply and decrease pressure on data collection, storage, transmission and processing.

Method for collecting signal with sampling frequency lower than Nyquist frequency

The present disclosure provides a method for manufacturing ordered nanowires array of NiO doped with Pt in situ, comprising: growing a Ni layer on a high-temperature resistant and insulated substrate; applying a photoresist on the Ni layer, pattering a pattern region of the ordered nanowires array by applying electron beam etching on the photoresist, growing Ni on the pattern region of the ordered nanowires array, peeling off the photoresist by acetone and etching the surface of the Ni layer by ion beam etching so as to etch off the Ni layer grown on the surface of the substrate and to leave the Ni on the pattern region of the ordered nanowires array to form the ordered Ni nanowires array; dipping the ordered Ni nanowires array into a solution of HPtClso as to displace Pt on the Ni nanowires array by a displacement reaction; and oxidizing the Ni nanowires array attached with Pt in an oxidation oven to obtain the ordered nanowires array of NiO doped with Pt. The present invention is simple and practical and the sensitivity and reliability of the doped sensor on the gas of CO and Hare greatly improved.

Method for manufacturing ordered nanowire array of NiO doped with Pt in situ

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Beijing, China

Shengfa Liang