A5100712393- Remote Sensing and Land Use
- Geoscience and Mining Technology
- Earthquake Detection and Analysis
- Semiconductor materials and devices
- Seismology and Earthquake Studies
- Ultrasonics and Acoustic Wave Propagation
- earthquake and tectonic studies
- Ultrasound Imaging and Elastography
- Industrial Technology and Control Systems
- Acoustic Wave Resonator Technologies
- Advanced Computational Techniques and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Memory and Neural Computing
- Structural Health Monitoring Techniques
- Silicon Carbide Semiconductor Technologies
- Smart Grid and Power Systems
- Evaluation Methods in Various Fields
- Advanced Sensor and Control Systems
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Geophysics and Sensor Technology
- Engineering Structural Analysis Methods
- Geochemistry and Geochronology of Asian Mineral Deposits
- Industrial Vision Systems and Defect Detection
- Power Systems and Technologies
Yunnan Earthquake Prevention and Disaster Reduction
2005-2025
China Academy of Engineering Physics
2017-2022
Kaifeng University
2020
China National Offshore Oil Corporation (China)
2019
Institute of Microelectronics
2006-2015
Tsinghua University
2006-2015
Shanghai Institute of Microsystem and Information Technology
2015
IMEC
2015
Beijing Survey and Design Institute (China)
2013
Shenzhen Science Museum
2012
This work demonstrates the ultrasonic imaging ability of piezoelectric micromachined transducer (PMUT) for detection defects deep in solids by total-focus algorithm. The 3-MHz PMUT array uses thin-film PZT as material energy transformation because its high coefficient. Six columns with 12 units each exhibit an acoustic pressure 137 kPa measured water at 1 cm away when driven a 27-Vpp input. Butter is chosen experimentally coupling agent to low noise level and short cycling down. Through...
Characterized by frequent earthquakes and a dense population, Yunnan Province, China, faces significant seismic hazards is hot place for earthquake forecasting research. In previous study, we evaluated the performance of b value 5-year during 2000–2019 made forward prediction M ≥ 5.0 in 2020–2024. this with forecast period having passed, first revisit results assess performance. Then, background seismicity rate, which may also offer valuable long-term information, incorporated into Province....
Many studies have shown that b values tend to decrease prior large earthquakes. To evaluate the forecast information in value variations, we conduct a systematic assessment Yunnan Province, China, where seismicity is intense and moderate–large earthquakes occur frequently. The catalog past two decades divided into four time periods (January 2000–December 2004, January 2005–December 2009, 2010–December 2014, 2015–December 2019). spatial are calculated for each 5-year span then used...
This article presents the piezoelectric micromachined ultrasonic transducer (PMUT) and its arrays that were based on a sputtered PZT/Si diaphragm structure prototyped from an SOI substrate. Due to high coefficient of PZT, polarization tuning pretreatment, membrane thickness optimization, PMUT shows transmitting sensitivity in air good coupling capability liquid solid. The transmitter exhibited 809, 190, 135 nm/V at resonant frequency 0.450, 0.887, 1.689 MHz, respectively, air. 5 ×5 array...
Abstract This paper presents a dual-frequency piezoelectric micromachined ultrasonic transducer (PMUT) line array with low crosstalk level, which was fabricated on silicon-on-insulator (SOI) wafers sputtered thin film (PZT) and Si diaphragm structure. The obtained consists of 120 0.77 MHz 192 2.30 PMUT units in total minimum interspace 50 μ m. Due to the high coefficient PZT, shows transmitting sensitivity air good effective electromechanical coupling factor. displacement sensitivities are...
In designing a charge pump cell, selection of switching frequency and component sizes is usually problem. There have been some discussions about Dickson most them considered the respectively. this paper, new generalized method for analysis design Makowski presented. Switching are as whole. Voltage loss power presented in detail. Conduction losses evaluated to achieve optimization terms sizes. Practical designs simulations performed prove validity accuracy theoretical optimization. It shows...
One important question in earthquake prediction is whether a moderate or large will be followed by an even bigger one. Through temporal b-value evolution analysis, the traffic light system can used to estimate if foreshock. However, does not take into account uncertainty of b-values when they constitute criterion. In this study, we propose optimization with Akaike Information Criterion (AIC) and bootstrap. The signals are controlled significance level difference between sample background...
A device-based health conditions monitoring and diagnosis method for inverters is present. In the inverter, SiCGTO (Gate-Turn-Off Thyristor) considered as key device to achieve pulse-width modulation. So performance degradation of SiC-GTO induced by interface-states critical inverters. research, electrical parameters, including forward blocking voltage dynamic switch characteristics, are evaluated with elevated density. Results indicate that voltage, turn-on/off speed gate drive current can...
Impact of band-engineering to the performance charge trapping memory with HfO2/Ta2O5/HfO2 (HTH) as layer is investigated. Compared devices same total HfO2 thickness, structures Ta2O5 closer substrates show larger program/erase window, because 2nd (next blocking oxide) serving part oxide reduces current tunneling out of/in during program and erase. Moreover, trapped centroid modulated contributed more flat-band voltage shift. Further experiments prove that a thicker exhibit saturate shift in...
In previous work, a four piezoelectric crab-leg suspensions micro vibratory stage, which could provide up to 280 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sup> /s transient angular rate, was used for in-situ self-calibration of generic MEMS gyroscopes [1]. this paper, the prognostic high-g response accelerometers or acceleration switches is taking into consideration improve integrity health method inertial sensors. Firstly, dynamic...
The back propagation (BP) neural network is commonly used to detect the fault of some equipment in actual project. When data sufficient, BP has achieved good results. But for practical engineering, it meets with rare failure event. proposed detection model based on deep this paper not only applicable case sufficient data, but also applies data. In structure reliability analysis, samples generated by Monte Carlo Simulation (MCS) are usually safe and very rare. similar event engineering....
This paper presents PZT thick film based piezoelectric micromachined ultrasonic transducer (PMUT) and its arrays, showing high transmitting sensitivity in air good coupling capability to solids. The PMUT is fabricated on a SOI substrate with sputtered PZT/Si diaphragm, the top Si thickness carefully designed order acquire enough obtained transmitter exhibits of 190 nm/V at resonant frequency 0.887 MHz air. And further thickness-measuring ability solids evaluated one array diameter 560 μm as...
Silicon carbide (SiC) gate turn-off (GTO) thyristor is attractive for grid applications due to the excellent performances of high blocking voltage and low ON-resistance. However, short-circuit reliability issue has become one limiting factors. An in situ condition monitoring method SiC GTO presented this work. It uses forward I- V characteristics anode-gate p-n junction as degradation precursor GTO. The circuit shows a current resolution 64 μA with range -31~1027 mA. provides full electrical...
In order to minimize leakage current increase under total ionizing dose (TID) radiation in high density memory circuits, a new isolation technique, combining deep trench (DTI) between the wells, local oxidation of silicon (LOCOS) devices within well, and P-diffused area limit at edge is implemented partly-depleted silicon-on-insulator (PD-SOI) technology. This hardening technique can layout by more than 60%, allows flexible placement body contact. Radiation hardened transistors 256 Kb flash...
This paper introduced the design of 100W active power correction factor circuit. It gives main calculating parameter circuit structure, In a wide range input voltage, improving and reducing pollution electronic grid.
High-k dielectrics are candidate materials for the charge trapping layer of memory devices. The use this material allows to obtain a larger window and better retention performance. We investigate capacitors with single or stacked high-K structures. Improved windows can be achieved by adopting high-k films as layers. However, data characteristics structures degraded respect ones single-layer
Piezoelectric micromachined ultrasonic transducer (PMUT) array has shown great potential for imaging. Current ultrasound images are reconstructed commonly using delay and sum (DAS) method. However, due to the low acoustic pressure high electrical noise of PMUT, these algorithms have insufficient image quality when being used solid defect This study reports a new extension double-stage multiply beamforming algorithm (DS-DMAS3) taking into account spatial correlation received signals....