Yangyang Wang

China Academy of Space Technology

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Jing Lü

Peking University

Ruge Quhe

Beijing University of Posts and Telecommunications

Jinbo Yang

Peking University

Meng Ye

Rutgers, The State University of New Jersey

Junjie Shi

Peking University

Feng Pan

Peking University Shenzhen Hospital

Zeyuan Ni

Tokyo Electron (Japan)

Jingzhen Li

Beijing University of Technology

Jiaxin Zheng

Peking University

Xiuying Zhang

Peking University

Cooperative Institutions

Chinese Academy of Sciences

146

Peking University

114

Zhejiang University

University of Chinese Academy of Sciences

Sun Yat-sen University

Shanghai Jiao Tong University

Tsinghua University

Central South University

South China University of Technology

Chinese Academy of Medical Sciences & Peking Union Medical College

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Study on the fluidity of foamed alkali-activated slag cementitious material (AASCM)

Heliyon (2023)

Kunpeng Yu Liqiang Ma Ichhuy Ngo Yangyang Wang Jiangtao Zhai

This study aims to investigate the evolution patterns of fluidity and rheological properties of AASCM under varying dosages of foaming agent and particle sizes of filling aggregate. The flow characteristics of AASCM are significantly affected by the filling aggregate's size and the foaming agent's dosage. Specifically, an increase in filling aggregate size (D(4,3) ϵ [26 μm, 69 μm]) enhances the fluidity of foamed AASCM, while an increase in foaming agent dosage reduces fluidity. These observed variations can be attributed to the presence of particle voids, the specific surface area of the aggregate, as well as the quantity and spatial distribution of bubbles within the slurry. A bubble-particle packing model is established, and by calibrating the simulation error coefficient to 1.1, the study investigates the evolution of water film thickness (WFT) in foamed AASCM with slurry expansion degree. It is observed that bubbles in the slurry affect the fluidity by altering the overall compactness and specific surface area of the foamed slurry, subsequently modifying the WFT.

Cementitious

Particle (ecology)

10.1016/j.heliyon.2023.e22277

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Citations (3)

Design Optimization of Polymer Electro-Optic Modulators Using Inverted-Rib Optical Waveguide

Symposium on Photonics and Optoelectronics (2012)

Beibei Qu Tong Zhang Ruo‐Zhou Li Xiao‐Yang Zhang Yangyang Wang

Polymer electro-optic modulators are essential elemental components for opto-sensors and optical fiber communication system [1, 2, 3]. In this paper, we designed a low-loss polymer electro-optic modulator with an inverted-rib waveguide structure based on new fluorinated polyimides electro-optic materials, which has more advantages in the preparation and device performance parameters. Also we calculated the key modulator parameters, such as half wave voltage(V _π ), characteristic impedance(Z _m ), microwave equivalent refractive index(N _m ), bandwidth(B _w ), loss coefficient (α _o ) in detail, according to different width, thickness and gap of electrode, then an optimized polymer electro-optic modulator structure with CPW electrode system was reported in theory. Finally, the simulation results show that the designed EOM has a low loss coefficient (α _o ) of about 0.08 dB/cm/GHz ^0.5 with a high frequency of 10 GHz at 1.55 μm.

Waveguide

10.1109/sopo.2012.6270488

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Citations (1)

Accurate but fragile passive non-line-of-sight recognition

Communications Physics (2021)

Yangyang Wang Yaqin Zhang Mei‐Yu Huang Zhao Chen Yi Jia

Abstract Non-line-of-sight (NLOS) imaging is attractive for its potential applications in autonomous vehicles, robotic vision, and biomedical imaging. NLOS imaging can be realized through reconstruction or recognition. Recognition is preferred in some practical scenarios because it can classify hidden objects directly and quickly. Current NLOS recognition is mostly realized by exploiting active laser illumination. However, passive NLOS recognition, which is essential for its simplified hardware system and good stealthiness, has not been explored. Here, we use a passive imaging setting that consists of a standard digital camera and an occluder to achieve a NLOS recognition system by deep learning. The proposed passive NLOS recognition system demonstrates high accuracy with the datasets of handwritten digits, hand gestures, human postures, and fashion products (81.58 % to 98.26%) using less than 1 second per image in a dark room. Beyond, good performance can be maintained under more complex lighting conditions and practical tests. Moreover, we conversely conduct white-box attacks on the NLOS recognition algorithm to study its security. An attack success rate of approximately 36% is achieved at a relatively low cost, which demonstrates that the existing passive NLOS recognition remains somewhat vulnerable to small perturbations.

Non-line-of-sight propagation

10.1038/s42005-021-00588-2

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Citations (16)

Angle-Selective Surface based on Aperture-Coupled Frequency-Selective Surface

Physica Scripta (2024)

Honghui Xu Dongfang zhou Qikun Liu Yangyang Wang Hang Qian

Abstract In this work, we propose a dual-polarized angle-selective surface (DASS) based on a compact double-layer aperture-coupled frequency-selective surface. The electromagnetic coupling between the compact aperture layers is leveraged to modify the equivalent permittivity and permeability along the normal direction, resulting in excellent dual-polarized, broadband angle-selective characteristics. Additionally, a novel compact stacking approach is introduced to further enhance the angle-selective performance. By tightly stacking two DASS layers, a double-layer DASS (DDASS) structure with superior angle-selective capabilities is achieved. Both structures are fabricated and measured, showing good agreement between the measured and simulated results. Compared to existing dual-polarized angle-selective surfaces, the proposed designs offer advantages such as a low profile and broadband frequency response.

Selective surface

Aperture (computer memory)

10.1088/1402-4896/ad8704

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Citations (0)

Durability of CO₂-fly ash-based backfill materials in cation water deterioration

International Journal of Mining Reclamation and Environment (2023)

Ichhuy Ngo Liqiang Ma Jiangtao Zhai Yangyang Wang Tianxiang Wei

This study aims to investigate the weakening of CO2-fly ash-based backfill (CFBF) material in cation water. Weakening is determined in an order of Na+ > Ca2+ > Mg2+ by slake durability and mechanical properties analysis. Na+ damages the microstructure of CFBF through the ion exchange phenomenon, causing the ejection of tetrahedral calcium. In Ca2+ and Mg2+ water, N-M-A-S-H gel is precipitated and filled in openings via a two electrical-layer mechanism, which mitigates the materials from further deterioration. On this basis, the suitable cation type and concentration range are proposed as criteria to implement CFBF in mine-water affected backfill coal mining.

10.1080/17480930.2023.2216498

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Citations (4)

HALF-METALLIC SILICENE AND GERMANENE NANORIBBONS: TOWARDS HIGH-PERFORMANCE SPINTRONICS DEVICE

NANO (2012)

Yangyang Wang Jiaxin Zheng Zeyuan Ni Ruixiang Fei Qihang Liu

By using first-principles calculations, we predict that an in-plane homogenous electrical field can induce half-metallicity in hydrogen-terminated zigzag silicene and germanene nanoribbons (ZSiNRs and ZGeNRs). A dual-gated finite ZSiNR device reveals a nearly perfect spin-filter efficiency of up to 99% while a quadruple-gated finite ZSiNR device serves as an effective spin field effect transistor (FET) with an on/off current ratio of over 100 from ab initio quantum transport simulation. This discovery opens up novel prospect of silicene and germanene in spintronics.

Germanene

Zigzag

10.1142/s1793292012500373

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Citations (79)

Effect of surface and internal Bi0 on the performance of the Bi2WO6 photocatalyst

Journal of Alloys and Compounds (2022)

Bingdong Yao Guangwei Zheng Lingxu Wang Zhaoyang Li Yangyang Wang

Rhodamine B

Nanomaterials

Bismuth

10.1016/j.jallcom.2022.168052

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Citations (17)

Thermal infrared and broadband microwave stealth glass windows based on multi-band optimization

Optics Express (2021)

Chang Yang Shuai Niu Huicong Chang Yangyang Wang Yajun Feng

With the rapid development of detection technologies, compatible stealth in the infrared and radar ranges has become increasingly essential not only for military application but also for personal privacy protection. In this study, we design a metamaterial window that possesses stealth ability in both the thermal infrared and broadband microwave ranges, using a particle swarm optimization algorithm to realize multi-band optimization. We experimentally verify that the proposed structure can achieve over 90% microwave absorption in the range 5.1 to 19.2 GHz (covering the X and Ku bands), with low infrared emissivity (∼0.15), and also maintain visible transmittance above 60%. Moreover, the window retains good performance up to 200 °C owing to the intrinsic properties of the material. Our multi-band optimization method enables the application of the transparent metamaterial windows in electromagnetic shielding and stealth and can potentially be applied in smart window related industries.

Infrared window

Low emissivity

10.1364/oe.424226

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Citations (35)

Experimental Research on the Effect of Fiberglass on the Performance of Epoxy Asphalt Concrete

Sustainability (2022)

Jintao Wei Xin Mao Wei Xu Chenchen Xi Shoujing Yan

Fiberglass prepared from broken waste glass can be used in epoxy asphalt mixtures for performance enhancement and a toughening effect. There is no systematic study on the influence mechanism of the size and the amount of glass fiber on the properties of epoxy asphalt mixtures. The effects of fiberglass on the properties of epoxy asphalt concrete were evaluated using a tensile test, three-point bending test, four-point bending fatigue test and an SEM scanning test. The results verify that the tensile strength of epoxy asphalt mastic with a 6 mm length and 2% content increased the most. Compared with the nondoped glass fiber, it increased by 69.2%. Under the influence of the internal composition of the asphalt mixture, the optimal ratio scheme is different from that of epoxy asphalt mastic. A microscopic analysis showed that uniformly dispersed fiberglass in the epoxy asphalt mixture forms a spatial network structure, leading to reinforcement and the restraint of microcrack expansion. The addition of fiberglass with a length of 9 mm and at a concentration of 5% to the epoxy asphalt mixture resulted in the maximum road performance. The Marshall stability increased by 43.5%, and the flexural and tensile strength increased by 33.7%. The fiberglass length is the most important factor limiting the strength and toughening effects of epoxy asphalt mixtures.

Asphalt concrete

10.3390/su142214724

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Citations (12)

Many-Body Effect and Device Performance Limit of Monolayer InSe

ACS Applied Materials & Interfaces (2018)

Yangyang Wang Ruixiang Fei Ruge Quhe Jingzhen Li Han Zhang

Due to a higher environmental stability than few-layer black phosphorus and a higher carrier mobility than few-layer dichalcogenides, two-dimensional (2D) semiconductor InSe has become quite a promising channel material for the next-generation field-effect transistors (FETs). Here, we provide the investigation of the many-body effect and transistor performance scaling of monolayer (ML) InSe based on ab initio GW-Bethe-Salpeter equation approaches and quantum transport simulations, respectively. The fundamental band gap of ML InSe is indirect and 2.60 eV. The optical band gap of ML InSe is 2.50 eV for the in-plane polarized light, with the corresponding exciton binding energy of 0.58 eV. The ML InSe metal oxide semiconductor FETs (MOSFETs) show excellent performances with reduced short-channel effects. The on-current, delay time, and dynamic power indicator of the optimized n- and p-type ML InSe MOSFETs can satisfy the high-performance and low-power requirements of the International Technology Roadmap for Semiconductors 2013 both down to 3-5 nm gate length in the ballistic limit. Therefore, a new avenue is opened to continue Moore's law down to 3 nm by utilizing 2D InSe.

Electron Mobility

10.1021/acsami.8b06427

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Citations (115)