公开(公告)号：US11687392B2

公开(公告)日：2023-06-27

申请号：US17534121

申请日：2021-11-23

Applicant: Tsinghua University

Inventor： Jiwu Shu ,  Qing Wang ,  Youyou Lu ,  Zhuo Cheng

IPC: G06F16/23 ,  G06F16/901 ,  G06F11/07 ,  G06F9/30 ,  G06F11/14 ,  G06F12/02

CPC classification number: G06F11/073 ,  G06F9/3009 ,  G06F11/0772 ,  G06F11/1438 ,  G06F12/0238 ,  G06F16/2365 ,  G06F2212/2542 ,  Y10S707/99953

Abstract: A method for constructing a persistent memory index in a non-uniform memory access architecture includes: maintaining partial persistent views in a persistent memory and maintaining a global volatile view in a DRAM; an underlying persistent memory index processing a request in a foreground thread when cold data is accessed; when hot data is accessed, reading a key-value pair for a piece of hot data in the global volatile view in response to a query operation carried in the request, and in response to an insert/update/delete operation carried in the request, updating a local partial persistent view and the global volatile view; and in response to a hotspot migration, a background thread generating new partial persistent views and a new global volatile view, and recycling the partial persistent views and the global volatile view for old hot data into the underlying persistent memory index.

公开(公告)号：US10605790B2

公开(公告)日：2020-03-31

申请号：US15665535

申请日：2017-08-01

Applicant: Tsinghua University

Inventor： Songling Huang ,  Wei Zhao ,  Yu Zhang ,  Qing Wang ,  Shen Wang

IPC: G01N29/44 ,  G01N29/24 ,  G01N29/07 ,  G01N29/12 ,  F03D17/00 ,  F03D80/50 ,  G01N29/04 ,  G01N29/22 ,  G01N29/26 ,  G01N29/34

Abstract: The present disclosure provides a device and method for detecting a defect in a main shaft of a wind turbine. The device includes: an excitation source, configured to generate an electromagnetic ultrasonic guided wave signal; a nickel strap, magnetized and disposed on an outer surface of an end of the main shaft; a coil, disposed at the nickel strap, configured to receive the electromagnetic ultrasonic guided wave signal such that the electromagnetic ultrasonic guided wave signal propagates in the main shaft, the coil and the nickel strap being configured to transform the electromagnetic ultrasonic guided wave signal propagating in the main shaft into an electrical signal by electromagnetic induction; a signal collector, configured to collect the electrical signal and transform the electrical signal into guided wave detection data and a wireless communication component, configured to transmit the guided wave detection data to a remote equipment.