A5101698156- Acoustic Wave Phenomena Research
- Vibration Control and Rheological Fluids
- Mechanical Engineering and Vibrations Research
- Microwave Engineering and Waveguides
- Structural Health Monitoring Techniques
- Vehicle Noise and Vibration Control
- Metamaterials and Metasurfaces Applications
- Solid State Laser Technologies
- Engineering Applied Research
- Natural Language Processing Techniques
- Seismic Waves and Analysis
- Ultrasonics and Acoustic Wave Propagation
- Hydraulic and Pneumatic Systems
- Industrial Technology and Control Systems
- Soil Mechanics and Vehicle Dynamics
- Radio Frequency Integrated Circuit Design
- Optical Systems and Laser Technology
- Optical Network Technologies
- Phase-change materials and chalcogenides
- Electromagnetic Compatibility and Noise Suppression
- Laser Design and Applications
- Advanced Combustion Engine Technologies
- Seismic Performance and Analysis
- Electromagnetic wave absorption materials
- Optical properties and cooling technologies in crystalline materials
China National Nuclear Corporation
2024
City University of Hong Kong
2023
University of Hong Kong
2014-2020
Hong Kong University of Science and Technology
2014-2020
Chinese Academy of Sciences
2013-2020
National Laboratory for Superconductivity
2020
Institute of Physics
2020
Xuzhou Construction Machinery Group (China)
2019-2020
State Council of the People's Republic of China
2019
Kowloon Hospital
2019
A designable electromagnetic and acoustic double-shielding graphene-based metastructure exhibits not only excellent interference shielding property but also robust efficiency.
ABACUS (Atomic-orbital Based Ab-initio Computation at USTC) is an open-source software for first-principles electronic structure calculations and molecular dynamics simulations. It mainly features density functional theory (DFT) compatible with both plane-wave basis sets numerical atomic orbital sets. serves as a platform that facilitates the integration of various methods, such Kohn-Sham DFT, stochastic orbital-free real-time time-dependent etc. In addition, aid high-performance computing,...
Damping of low frequency vibration by lightweight and compact devices has been a serious challenge in various areas engineering science. Here we report the experimental realization type miniature dampers based on decorated membrane resonators. At around 150 Hz, two dampers, each with outer dimensions 28 mm diameter 5 height, total mass 1.78 g which is less than 0.6% host structure (a nearly free-standing aluminum beam), can reduce its vibrational amplitude factor 1400, or limit maximum...
A compact triple-band high-temperature superconducting (HTS) bandpass filter using multimode stub-loaded resonator is proposed in this paper. The resonant characteristics of the are investigated by even/odd-mode analysis. To sharpen passband skirts, a source-load coupling configuration with nonresonant node arranged to produce several extra transmission zeros for realizing high-selectivity performances. For demonstration purposes, operating at 2.45 GHz (ISM band), 3.5 (WiMAX and 5.2 (WLAN...
Abstract We report the phenomenon of coherent super decay (CSD), where a linear sum displacement several damped oscillators can collectively much faster than individual ones in first stage, followed by stagnating after more 97% energy has been dissipated. The parameters for CSD are determined process response function decomposition, which is to use slow functions approximate fast resonator. Evidence established experiments and finite element numerical simulations not only strongly supported...
The time domain implementation of the transfer-matrix method developed by Song and Bolton [J. Acoust. Soc. Am. 107, 1131–1154 (2000)] for measuring characteristic impedance wave number porous materials is described in this paper. so called Butterworth impulse generated a standing tube with flat frequency response over wide range. With only two microphone measurements, transfer matrix layers can easily be determined through calculation complex amplitudes incident, reflected, transmitted...
In this paper, a novel miniaturized branch-line coupler (BLC) operating at 1.675GHz is proposed. Partially meandered lines and dual transmission equivalent technology are used as the coupler's shunt arms, producing signiflcant reduction by more than 68% compared with conventional coupler. Moreover, can equally divide input signal 90 - phase of difierence while maintaining initial power from source simple structure. The simulated measured results in good agreement, thereby verifying design concept.
The limited inventory and minute natural abundance of <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> He gas on Earth necessitate the adoption new technologies for detection neutrons, especially in homeland security applications, where large volume deployments are required. We investigate neutron efficiency a backpack radiation detector based an unmoderated array boron-coated straws (BCS). A module was configured that would be light...
Key agreement for collaborative groups has become an increasingly popular research area. However, most of previous work requires each member to not only maintain the whole key tree structure whose size is O(N), where N group, but also involve rekeying operation upon membership change, resulting in high costs terms storage, communication and computation thus suffers from poor scalability. In this paper, we propose a scalable Distributed group scheme using Virtual Tree (D-VKT). Each D-VKT...
Abstract A simple and successful design for a microstrip stepped-impedance resonator (SIR) bandpass filter (BPF) based on inductive coupling is presented. It well known that SIRs are used to shift or suppress the higher order frequencies. In achieve compact circuit size, perceptual utilized. Based theoretical analysis, this can spurious frequency 3.8 f 0 . The experimental results show good agreement with theory simulations.
Microwave filters are essential elements in many areas of RF/microwave engineering. The crowded frequency spectrum has put forward higher requirements on channel filters. Not only very high close-to-band rejections required to prevent interference or from closely neighboring channels, but also low insertion loss is reduce system noise figure. Some require in-band group-delay and amplitude flatness minimize signal degradation even further. Surface resistance temperature superconducting (HTS)...
Large Language Models (LLMs) have become essential in advancing natural language processing (NLP) tasks, but their sequential token generation limits inference speed. Multi-Draft Speculative Decoding (MDSD) offers a promising solution by using smaller draft model to generate multiple sequences, which the target LLM verifies parallel. However, current heuristic approaches, such as Recursive Rejection Sampling (RRS), suffer from low acceptance rates subsequent drafts, limiting advantages of...
Abstract Sebei Gas Field in Qinghai is the fourth largest gas field China. The reservoirs here are of unconsolidated Quaternary siltstones and pelitic siltstones, alternating water layers with serious sand production. grain size sands very fine, so it difficult to realize control, a cosmopolitan puzzle. We have succeeded applying series techniques comprehensive control fiber-complex high-pressure packing but without any screen pipe. technology includes reservoir pretreatment, fiber- complex...
Engine performance under full working conditions, especially dynamic ones, is indispensable in many vehicle-level research fields. To acquire the engine parameters, a novel whole-region model, considering both steady and was developed based on limited test data this work. This model used throttle position, speed, its acceleration as input variables to predict torque brake-specific fuel consumption all practical conditions within operating envelope. The bench first conducted typical collect...
Shift quality is the key of automatic transmission research on mining vehicles due to frequent gear-shifting. A comprehensive dynamic model built analyze shifting process system. To calibrate and adjust hydraulic pressure curves clutches in model, experimental data acquired by road test are used strategy as calibrating reference data. Then characteristic shift jerk control realize gear selecting regulation illustrated. The simulation results reveal accuracy system feasibility strategy.
A new approach is proposed for measuring the sound absorption coefficient of material at normal incidence, that bases on echo-pulse method in a circular tube. Two types acoustical and structure were employed: foam pipe exit. different waveforms called Butterworth damped sine pulse are successfully generated used as incident pulses experiment measurement pipe. The measured by consistent with B&K 4206 impedance tube measurement. Discrepancy between them totally less than 10% broadband...
Passband flatness and band-edge selectivity in microwave filters with finite quality-factor resonators can be improved by the synthesis of lossy filters.This paper demonstrates extension this technique to a diplexer means resistive coupling.A dual-mode stub-loaded resonator (SLR) junction fork-like feedline are used address challenge independently controlling external coupling from common port two channel therefore enable flexible realization bandwidth.The matrices couplings for...
We report a framework of underground barriers against seismic waves from high-magnitude earthquakes, which consist the deep subwavelength decorated membrane resonators (DMR's) modeled as type artificial soil, meta-soil, is buried in host soil. The meta-soil has same elastic properties soil but with dynamic effective mass density that mimics functionality DMR's mixed Metallic multiple working frequencies down to 7 Hz are experimentally demonstrated. Transmission attenuation exceeding 20 dB...