A5103152841- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
- Antenna Design and Optimization
- Structural Health Monitoring Techniques
- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Infrastructure Maintenance and Monitoring
- Ultrasonics and Acoustic Wave Propagation
- Astronomy and Astrophysical Research
- Space Science and Extraterrestrial Life
- Image Processing Techniques and Applications
- Advanced Vision and Imaging
- Astrophysics and Cosmic Phenomena
- Terahertz technology and applications
- Advancements in PLL and VCO Technologies
- GNSS positioning and interference
- CCD and CMOS Imaging Sensors
- Soil Moisture and Remote Sensing
- Genital Health and Disease
- Geophysics and Gravity Measurements
- Non-Destructive Testing Techniques
- Optical Network Technologies
Yancheng Institute of Technology
2025
Changchun University of Technology
2025
Tsinghua University
2024
Fudan University
2024
Xinjiang Astronomical Observatory
2017-2023
Chinese Academy of Sciences
2011-2023
University of Chinese Academy of Sciences
2020-2021
In structural health monitoring, effectively eliminating the influence of variable environmental conditions on modal frequencies remains a critical challenge for accurate damage identification. Nonstationary and nonlinear variations in frequencies, commonly induced by changes, tend to overshadow effects caused damage. An improved Gaussian mixture model (GMM) is proposed this paper normalize nonstationary frequency data, enabling effective detection under conditions. As effectiveness GMM...
Abstract The Search for Extraterrestrial Intelligence (SETI) attempts to address the possibility of presence technological civilizations beyond Earth. Benefiting from high sensitivity, large sky coverage, and an innovative feed cabin China’s Five-hundred-meter Aperture Spherical radio Telescope (FAST), we performed SETI’s first observations with FAST’s newly commissioned 19 beam receiver; report preliminary results in this paper. Using data stream produced by SERENDIP VI real-time multibeam...
We present the data analysis pipeline, commissioning observations and initial results from GREENBURST fast radio burst (FRB) detection system on Robert C. Byrd Green Bank Telescope (GBT) previously described by Surnis et al. which uses 21~cm receiver observing commensally with other projects. The pipeline makes use of a state-of-the-art deep learning classifier to winnow down very large number false positive single-pulse candidates that mostly result frequency interference. In our totalling...
This Digital image correlation method is a non-contact measurement that achieves deformation by tracking speckle patterns cover the measured surface and deform with surface. The quality of has significant direct impact on accuracy DIC. A global evaluation for pattern using simple easy-to-calculate parameter called two-dimensional entropy proposed in this paper. To verify effectiveness method, comparative experiments are conducted displacement three types speckle. results indicate larger...
Structural health monitoring commonly uses natural frequency analysis to assess structural conditions, but direct shifts are often insensitive minor damage and susceptible environmental influences like temperature variations. Traditional methods, whether based on absolute changes or theoretical models PCA GMM, face challenges in robustness reliance model selection. These limitations highlight the need for a more adaptive data-driven approach capturing intrinsic nonlinear correlations among...
Structural Health Monitoring relies on accurate modal identification and effective damage detection to assess structural performance safety. However, traditional sensor placement methods struggle balance uncertainty, which arises from limited coverage measurement noise sensitivity, requires sensors be optimally positioned capture stiffness variations. To address this challenge, study proposes a multi-objective optimization method based the Non-Dominated Sorting Genetic Algorithm. The...
This study aims to investigate the effectiveness of microwave therapy combined with focused ultrasound or white spot ointment infrared light for treating vulvar sclerosing lichen in females. A retrospective was conducted on 126 patients sclerosus admitted our hospital between August 2020 and December 2022. The were divided into 3 groups: treatment, ultrasound, paste light, each group consisting 42 cases. treatment underwent coagulation using a multifunctional machine, received traditional...
We present our piggyback search for fast radio bursts using the Nanshan 26m Radio Telescope and Kunming 40m Telescope. The observations are performed in L-band from 1380 MHz to 1700 at S-band 2170 2310 Kunming. built \textsc{Roach2}-based FFT spectrometer developed real-time transient software. introduce a new interference mitigation technique named \emph{zero-DM matched filter} give formula of signal-to-noise ratio loss search. Though we have no positive detection about 1600 2400 hours data...
Abstract As the number of array elements and bandwidth increase, design challenges Phased Array Feed (PAF) front-end its signal processing system increase. Aiming at ng-PAF 110 m radio telescope, this article introduces concept fully digital receivers attempts to use Radio Frequency System-on-Chip (RFSoC) technology digitize close feed array, reduce complexity analog components front-end, improve fidelity signals. The discusses beamforming topology designs a PAF experimental based on...
Abstract The 110 m QiTai radio Telescope (QTT) will be equipped with multiple Ultra-WideBand (UWB) receivers in the primary and Gregory focus to achieve continuous frequency coverage from 270 MHz 115 GHz, which poses great challenges signal acquisition, transmission, real-time processing. Aiming at 10 GHz above full-bandwidth acquisition multi-scientific processing for QTT UWB signals, an experimental system high-speed 100 Gb network multi-path distribution, fast recording is designed by...
ALFABURST has been searching for Fast Radio Bursts (FRBs) commensally with other projects using the Arecibo L-band Feed Array (ALFA) receiver at Observatory since July 2015. We describe observing system and report on non-detection of any FRBs from that time until August 2017 a total 518 hours. With current FRB rate models, along measurements telescope sensitivity beam size, we estimate this survey probed redshifts out to about 3.4 an effective volume around 600,000 Mpc$^3$. Based this, would...
Abstract The discovery of ubiquitous habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, has ushered a renaissance the search for extraterrestrial intelligence (SETI). Large scale SETI activities are now underway at numerous international facilities. Five-hundred-meter Aperture Spherical radio Telescope (FAST) is largest single-aperture telescope world, well positioned to conduct sensitive searches emission indicative...
Abstract We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at Green Bank Telescope. GREENBURST uses dedicated L -band receiver tap to over 960–1 920 MHz frequency range for pulses with dispersion measures out $10^4\ \rm{pc\,cm}^{-3}$ . Due its unique design, is capable conducting searches FRBs when not being used scheduled observing. This makes it sensitive single pixel detector reaching deeper in radio sky. While from Galactic pulsars...
Zero bias Schottky diodes often used as microwave power detectors. The detection law is a function of frequency, temperature, power, DC and diode parameters such n (ideality factor) I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</inf> (saturation current). In order to get wider dynamic range, better thermal stability more accurate square response over the range we analyzed these characteristics in MATLAB. Detailed analysis, related curves...
Abstract A multi-function digital baseband data acquisition system is designed for the sampling, distribution and recording of wide-band multi-channel astronomical signals. The hires a SNAP2 board as converter to digitize, channelize packetize received signal. It can be configured dynamically from single channel eight channels with maximum bandwidth 4096 MHz. Eight parallel HASHPIPE instances run on four servers, each carrying two NVMe SSD cards, achieving total continuous write rate 8 GB s...
Abstract Radio Frequency System on Chip (RFSoC) offers great potential for implementing a complete next generation signal processing system single board radio astronomy. We designed pulsar digital backend based the ZCU111 board. The uses RFSoC technology to implement digitization, channelization, correlation and high-speed data transmission in Xilinx ZU28DR device. have evaluated performance of eight 12-bit RF-ADCs, which are integrated RFSoC, with maximum sampling rate 4.096 GSPS. RF-ADC...
Abstract Aiming at the subband division of ultra-wide bandwidth low-frequency (UWL) signal (frequency coverage range: 704–4032 MHz) Xinjiang 110 m QiTai radio Telescope (QTT), a scheme is designed. First, we analyze effect different window functions such as Hanning window, Hamming and Kaiser on performance finite impulse response (FIR) digital filters, implement critical sampling polyphase filter bank (CS-PFB) based FIR filter. Second, generate 3328 MHz simulation data ultra-wideband pulsar...
大型全可动射电望远镜关键技术研究专辑 论 文Fast radio burst (FRB) is an occasional and instantaneous burst.In order to detect more samples for research, this paper develops a real-time search digital backend based on multi-beam receiver.The system includes data acquisition processing, single-beam signal synthesis analysis, detection results storage distribution.It can collect analyze signals simultaneously.Multi-beam reference effect used eliminate frequency interference improve accuracy.Observation experiments...
Abstract In this paper, we report a real-time Fast Radio Burst (FRB) searching system that has been successfully implemented with the 19 beam receiver of Five-hundred-meter Aperture Spherical radio Telescope (FAST). The relatively small field view FAST makes search for new FRBs challenging, but its high sensitivity significantly improves accuracy FRB localization and enables detection high-precision neutral hydrogen absorption lines generated by FRBs. Our goal is to develop an capable allows...