A5049746669- Advanced Wireless Communication Techniques
- Wireless Communication Networks Research
- Advanced MIMO Systems Optimization
- Photonic and Optical Devices
- Terahertz technology and applications
- Superconducting and THz Device Technology
- PAPR reduction in OFDM
- Antenna Design and Optimization
- Cooperative Communication and Network Coding
- 2D Materials and Applications
- Perovskite Materials and Applications
- Cognitive Radio Networks and Spectrum Sensing
- Satellite Communication Systems
- Error Correcting Code Techniques
- Millimeter-Wave Propagation and Modeling
- Advanced Sensor and Control Systems
- Advanced Optical Imaging Technologies
- Chalcogenide Semiconductor Thin Films
- Blind Source Separation Techniques
- Advanced Fiber Laser Technologies
- Advanced Adaptive Filtering Techniques
- Industrial Automation and Control Systems
- Optical measurement and interference techniques
- Optical Network Technologies
- Cryospheric studies and observations
Northwestern Polytechnical University
2024-2025
Northwest Institute of Eco-Environment and Resources
2024
Chinese Academy of Sciences
2015-2024
Gansu Qilian Mountains Water Conservation Forest Research Institute
2024
State Grid Corporation of China (China)
2024
City University of Hong Kong
2024
Qingdao University
2024
University of Chinese Academy of Sciences
2023-2024
Institute of Hydrobiology
2023-2024
Zhejiang University
2006-2023
The integration of different two-dimensional materials within a multilayer van der Waals (vdW) heterostructure offers promising technology for high performance opto-electronic devices such as photodetectors and light sources. Here we report on the fabrication electronic properties vdW heterojunction diodes composed direct band gap layered semiconductors InSe GaSe transparent monolayer graphene electrodes. We show that type II alignment between two their distinctive spectral response,...
In order to increase the response speed of InSe‐based photodetector with high photoresponsivity, graphene is used as transparent electrodes modify difference work function between and InSe. As expected, InSe/graphene photodetectors down 120 μs, which about 40 times faster than that an InSe/metal device. It can also be tuned by back‐gate voltage from 310 μs 100 μs. With speed, photoresponsivity reach 60 A W −1 simultaneously. Meanwhile possess a broad spectral range at 400–1000 nm. The design...
The meta-stable active layer morphology of organic solar cells (OSCs) is identified as the main cause rapid burn-in loss power conversion efficiency (PCE) during long-term device operation. However, effective strategies to eliminate associated mechanisms from initial stage operation are still lacking, especially for high-efficiency material systems. Herein, introduction molecularly engineered dimer acceptors with adjustable thermal transition properties into OSCs serve supramolecular...
Atomically thin layered two-dimensional materials, including transition-metal dichacolgenide (TMDC) and black phosphorus (BP), (1) have been receiving much attention, because of their promising physical properties potential applications in flexible transparent electronic devices . Here, for the first time we show non-volatile chargetrap memory devices, based on field-effect transistors with large hysteresis, consisting a few-layer channel three dimensional (3D) Al2O3 /HfO2 /Al2O3 charge-trap...
A graphene-coated microfiber (GCM)-based hybrid waveguide structure formed by wrapping monolayer graphene around a with length of several millimeters is pumped nanosecond laser at ∼1550 nm, and multi-order cascaded four-wave-mixing (FWM) effectively generated. By optimizing both the detuning pump power, such GCM device high nonlinearity compact size would have potential for wide range FWM applications, as phase-sensitive amplification, multi-wavelength filter, all-optical regeneration...
Abstract. This study develops a model for early warning of snow-caused livestock disasters on county basis and proposes method qualitative risk assessment snow at 500 m resolution pastoral areas the Tibetan Plateau (TP). Data used development include remote sensing data, statistical data weather, livestock, social economy, 45 typical disaster cases from 2000 to 2010. The principal component analysis (PCA) approach is choose 7 crucial factors that contribute over 85% information TP. They are...
This paper investigates the uplink transmission in multicell multiuser multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. The system model considers imperfect channel estimation, pilot contamination (PC), and multicarrier multipath channels. Analytical expressions are first presented on mean square error (MSE) of two classical estimation algorithms [i.e., least squares (LS) minimum (MMSE)] presence PC. Then, a simple H-infinity (H-inf) approach...
In the race for leadership in emerging technologies typified by artificial intelligence (AI), European Union (EU) stands out as one of pioneering regional cooperation organizations to embark on AI safety governance[1].With digital becoming increasingly politicized and securitized, dynamics competition sphere are more shaped security considerations. Consequently, EU's emphasis governance has progressively pivoted from data protection towards establishment sovereignty[2]. Amidst evolution...
Recently, the research interest in indoor active millimeter wave (mmW) imaging by applying synthetic aperture radar (SAR) technique is increasing. However, there a lack of proper computer-aided design (CAD) tools at system level, and almost all R&D activities rely on experiments solely. The high cost such stops many researchers from investigating fascinating topic. Moreover, experiment-oriented studies may blind to some details during process, since most cases they are only interested...
A refractive index sensor based on a multi-core micro/nano fiber is proposed for low solutions. At first, the mode field distribution of tapered analyzed with finite element model (FEM). After that, relationship between sensitivity and diameter calculated. last, four sensors different sizes are explored, when taper length 16.20 mm, can reach 5815.50 nm/RIU, which agrees theoretical analysis. The measurement error less than 0.5‰, has high practical application value. longer is, smaller is....
During the first phase of deployment new radio (NR) networks, base station (BS) and user equipment (UE) are expected to operate alongside pre-existing long-term evolution (LTE) networks. This paper proposes a solution be adopted by NR UE perform an uplink transmission towards BS over same time frequency resources as legacy LTE system, which would extend coverage when operating at supplementary band. In order guarantee absence interference BS, we design waveform termed inverse discrete...
Active millimeter-wave images typically exhibit characteristic speckle noise, due to the coherence of artificial sources. We study Hadamard contrast reduction (SCR) technique, which has been successfully used in laser projection systems, context imaging. show impact pattern order and size image resolution on efficiency. Practical limitations implementations their effect efficiency are also discussed.
To simulate imaging systems, Fourier optics has been applied very successfully to for decades.However, when simply moving indoor millimeter wave some assumptions underlying the may break down, which contribute errors by applying optics.During review of mathematical derivation optics, we point out how are introduced making Fresnel approximation and omitting phase factors.To distinguish from much literature, discuss accuracy rather than plane wave.Moreover, check simulation results systems...
This paper presents a simplified calculation method to model active millimeter wave imaging system based on Huygens' principle. Though limited its ability do the accurately, it still gives good evaluation of performance practical 3D systems. Thus simulator can act as an effectivel tool at beginning design. The inherent effects in coherent such ringing, speckle and glint will be shown. To deal with speckle, Hadamard diffuser is suggested. Influence pattern size cell are discussed accompanied...