A5101142075- Advanced Optical Sensing Technologies
- HVDC Systems and Fault Protection
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Multilevel Inverters and Converters
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Laser Material Processing Techniques
- Advanced DC-DC Converters
- Analytical Chemistry and Sensors
- Railway Systems and Energy Efficiency
- High-Voltage Power Transmission Systems
- Hydraulic and Pneumatic Systems
- Photonic Crystal and Fiber Optics
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Superconducting and THz Device Technology
- Advancements in PLL and VCO Technologies
- Electrical Contact Performance and Analysis
- Semiconductor Lasers and Optical Devices
- Hydrocarbon exploration and reservoir analysis
- Nanowire Synthesis and Applications
Beijing Jiaotong University
2021-2024
Southeast University
2024
Nanjing University
2021-2023
Yangtze University
2021
China Academy of Space Technology
2021
Purple Mountain Laboratories
2021
Inner Mongolia Electric Power (China)
2020
Northwestern Polytechnical University
2019
Fudan University
2017
National Sun Yat-sen University
2010
Designing a spectrometer without the need for wavelength multiplexing optics can effectively reduce complexity and physical footprint. On basis of computational spectroscopic strategy combining broadband-responsive dynamic detector, we successfully demonstrate an optics-free single-detector that maps tunable quantum efficiency superconducting nanowire into matrix to build solvable mathematical equation. Such realize broadband spectral responsivity ranging from 660 1900 nm. The resolution at...
To address the issue of brief power outages when trains pass through neutral section, various automatic section suppliers have been investigated. However, schemes in existing literature two main problems: converter has numerous bridge-legs and large capacity, only operates briefly during passing remaining standby idle state for over 95% time. solve these problems, this paper proposes a topology supplier based on three-leg converter. The proposed fewer bridge-leg counts requires smaller...
A spectrum-resolved photon detector is crucial for cutting-edge quantum optics, astronomical observation, and spectroscopic sensing. However, such an ability rarely obtained because a direct linear conversion from weak single-photon energy to readable electrical signal above the noise level without causing avalanche challenging. Here, we overcame these difficulties by building probabilistic energy-to-amplitude mapping in tapered superconducting nanowire combining computational reconstruction...
Large scale renewable energy, represented by wind power and photovoltaic power, has brought many problems for the safe stable operation of system. Firstly, this paper analyzes main large-scale integration into Secondly, introduces basic principle engineering construction pumped storage station. Thirdly, expounds in detail current application station system, finally points out faced development Pumped Storage Power Station trend, so as to provide reference
Photon number resolving (PNR) is an important capacity for detectors working in quantum and classical applications. Although a conventional superconducting nanowire single-photon detector (SNSPD) not PNR detector, by arranging nanowires series array multiplexing photons over space, such PNR-SNSPD can gain quasi-PNR capacity. However, the accuracy maximum resolved photon are both limited signal-to-noise ratio (SNR) of output pulses. Here, we introduce matched filter, which optimal filter...
Medical humanities (MH) is an interdisciplinary field of medicine which includes the (literature, philosophy, ethics, history, and religion), social sciences (anthropology, cultural studies, psychology, sociology, health geography), arts theater, film, visual arts) their application to medical education practice. Studies MH should not be limited theoretical discussions. Research results must translated into use methodologies formulate policies, guide clinical practices, help resolve physical...
A 5-bit active digital step attenuator (DSA), which simultaneously achieves low amplitude and phase variations, is proposed for wideband phased-array applications. The input output impedances each attenuation unit under the reference state can remain basically same. Therefore, errors caused by a load impedance mismatch between be alleviated. Implemented in 130-nm silicon-germanium (SiGe) BiCMOS technology platform, DSA provides maximum range of 15.5 dB with 0.5-dB steps. It exhibits an...
A fan-out circuit is a basic block for scaling up digital circuits overcoming the limited driving capability of single logic gate. It particularly important superconducting as power typically weak having high energy efficiency. Here, we design and fabricate nanowire cryotron (nTron) circuit. classic splitter tree architecture adopted. To transmit switching signal avoid crosstalk among nTrons, introduced an “R–L–R” interface Experimentally, two-stage number four was demonstrated. Correct...
The dc-link capacitor voltage drift is the key technical problem of converters with multi-intermediate nodes. back-to-back (BTB) configuration balancing control can achieve a certain operation range. Nevertheless, challenge still remains, especially when both sides operate at high but different modulation indexes and power factors. This article focuses on BTB seven-level V-clamp multilevel converter (VMC). balanced limits are presented, effect factor capability analyzed. To maintain under...
Scaling up superconducting nanowire single-photon detectors (SNSPDs) into a large array for imaging applications is the current pursuit. Although various readout architectures have been proposed, they cannot resolve multiple-photon detections (MPDs) currently, which limits operation of SNSPD arrays at high photon flux. In this study, we focused on ambiguity imager applying time-of-flight multiplexing readout. The results showed that image distortion depended both incident flux and object. By...
Abstract This study reports a mid‐infrared Ho 3+ :BaY 2 F 8 laser directly pumped by diodes (LDs). A finite element method (FEM) was used to calculate the temperature and thermal stress distributions inside :BYF crystal. The damage conditions have been evaluated on basis of experimental results. Using 889 nm LDs with repetition frequency pulse duration 13 Hz 100 μs, respectively, an output energy 1.05 mJ at 3.9 μm for pump 336.8 achieved. might be useful constructing compact robust laser.
Abstract In recent years, the widespread adoption of wind power has been facilitated by rapid advancements in new energy generation technology. The precise identification and efficient management DC faults onshore farms gained increasing significance. To address issues such as limited functionality, low device utilization, inefficient use fault prevalent current location methods applied flexible grid-connected systems, this study explores storage reuse technology energy. article proposes a...
A fully integrated digital modulator/demodulator design for Power Line Communication (PLC) is presented. The proposed consisted of Cyclic Redundancy Check (CRC), Pulse Width Modulation (PWM), and Frequency Shift Keying (FSK). CRC can detect the errors occurred in communication. function PWM to generate pulses that exhibit same pulse width according swing input voltage swing. In telecommunication, FSK a frequency modulation scheme such information be transmitted through discrete changes...
We report on a diode-pumped composite ceramic disk laser in this paper. The YAG/Nd:YAG consists of 4 mm thick pure YAG and 2 Nd:YAG with 1.0 at.% doping concentration. slope efficiency the is 36.6% corresponding to maximum optical–optical 29.2%. Furthermore, 340 W average power output was achieved at absorbed pump 1290 W.
A superconducting nanowire single-photon imager (SNSPI) uses a time-multiplexing method to reduce the readout complexity. However, due serial connection, should be uniform so that common bias can set all segments of their maximum detection efficiency, which becomes more challenging as scalability (i.e., length nanowire) increases. Here, we have developed 64-pixel SNSPI based on amorphous Mo80Si20 film, yielded and slow transmission line. Adjacent detectors were separated by delay lines,...
Multilayer superconducting nanowire single-photon detectors (SNSPDs) have exhibited several advantages, such as increased detection efficiency, reduced polarization sensitivity, and scaling up to large arrays. However, monolithic fabrication of multilayer devices is challenging. In this work, a hybrid integration method has been introduced by etching SNSPDs into the membrane microchips, followed pick place transferring process. This verified stacking two orthogonally. Both show near...
A suite of oil-sand bitumen and crude oil samples, collected from the Laizhouwan depression, Bohai Bay basin, were geochemically investigated for molecular compositions. Three families (A, B, C) classified by hierarchical cluster analysis (HCA) principal component on nine typical biomarker ratios. Typically, family oils are characterized relatively low values gammacerane/C31 homohopane 22R (G/H31, 0.13–0.76) C35/C34 (H35/H34, 0.39–0.78), suggesting a source freshwater depositional...
Featured with the simple structure, V-clamp multilevel converter (VMC) shows good prospect in high-voltage and high-power applications. But VMC is endangered by deviation of dc-link capacitors voltage, especially under high modulation index (MI) power factor (PF) condition. Thus, a voltage balancing strategy for three-phase seven-level proposed this paper. This re-designs carriers reference to achieve reduced switching actions. Besides, an active compensation control presented improve...
This paper proposes a novel flexible uninterrupted neutral section passing system based on four-leg V-clamp multilevel converter (VMC). It can better solve series of problems such as overvoltage, overcurrent and speed loss caused by the interruptible over-phase scheme used in electrified railway, compensate negative sequence reactive current traction power supply at same time. VMC is new type with common DC-link capacitors. has advantages number devices to some extent, its expansion from odd...
A continuous co-phase traction power supply system based on delta-connected cascaded H-bridge converter for electrified railway, which can solve the problems of non-electrical zone called neutral section and quality issues when supplying to locomotives reduce capacity converter, is presented in this paper. The contains three chains, be controlled separately deliver stable single-phase AC grid. control algorithm balance DC capacitor voltages among chains submodules within each chain running...
LD-side-pumping schemes for a solid-state laser offer the advantages of both high pump efficiency and output power. However, thermally-induced lens has been known to severely affect performance high-powered lasers. To solve problem, systematic simulation model was developed by combining two procedures ray tracing finite element method (FEM) together explore thermal characteristics Nd:YAG laser. The relationship between spatial heat density distribution refractive index investigated taking an...