Article
Optics
Linpei Xue, Yihan Jin, Steve J. Elston, Stephen M. Morris
Summary: This paper investigates the optical phase modulation potential of a nematic liquid crystal (LC) π-cell in the symmetric H (Hs) state. Experimental results of optical phase modulation using a phase-shifting Michelson interferometer are compared with simulation results using the Ericksen-Leslie continuum theory. The stability of the Hs state is studied by adjusting the applied voltage and the voltage burst duration. The LC pi-cell driven into the Hs state using a short burst voltage shows excellent phase modulation capability in achieving full 2n phase modulation with a 1 ms timescale in a reflective geometry.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Vladimir Anisimkin, Elizaveta Shamsutdinova, Peng Li, Bin Wang, Feng Zhu, Zhenghua Qian, Iren Kuznetsova
Summary: By using plates of weak piezoelectric crystal loaded with various liquids, the study investigates the sensitivity of different modes towards viscosity, temperature, and electric conductivity. It discovers some modes with selective properties that can respond to specific parameters by adjusting the plate parameters. Sensor prototypes with selective operation are designed to measure viscosity, temperature, and electric conductivity in different ranges.
Article
Computer Science, Information Systems
Xiaotong Li, Hiroyasu Sato, Yosei Shibata, Takahiro Ishinabe, Hideo Fujikake, Qiang Chen
Summary: This paper proposes a reconfigurable reflectarray (RA) using electrically biased liquid crystal (LC) to achieve beam steering at both E-plane and H-plane. By changing the equivalent relative permittivity of the liquid crystal and reflection phase, the LC RA can scan the beam in both E-plane and H-plane.
Article
Materials Science, Ceramics
Sheng Pang, Liangwei Cong, Youpeng Xu, Yiwei Sun, Dong Wang, Guoyu Qian, Zhi Wang
Summary: In this study, dual regulation of crystal structure and purity of Ti2SC within the Ti/TiC/FeS2 system was achieved by enhancing reactant contact and controlling crystal plane growth rates. PS-Ti2SC and HOS-Ti2SC with purity greater than 99 wt% were successfully prepared. This work opens up a new pathway for developing the MAX phase through crystal structure regulation and high purification preparation.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Yihan Jin, Steve J. Elston, Julian A. J. Fells, Bohan Chen, Mengmeng Li, Waqas Kamal, Zimo Zhao, Stephen M. Morris
Summary: The study investigates the time-dependent phase modulation behavior of liquid crystal devices under different electric field conditions. It shows that backflow benefits the phase modulation of the pi-cell, but hinders the dynamic phase response of the Freedericksz cell, in agreement with simulations.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jingfu Ye, Yan Li, Shiliang Qu
Summary: The study introduces a quarter-ring-shaped phase-gradient metasurface (QR-PGM) that sorts propagating waves into separate waveguide channels based on their orbital angular momentum states, showing high focusing efficiency and wide wavelength range. This compact and efficient structure can be easily integrated with other on-chip devices, providing new possibilities for high-capacity optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Kun Wang, Xiao-Feng Liu, Yuan-An Zhao, Chun-Xian Tao, Jian-Guo Wang, Shao-Zhong Ou, Zhi-Chang Mo, Zhao-Liang Cao, Da -Wei Li, Da -Wei Zhang, Jian-Da Shao
Summary: The effects of 1064-nm continuous-wave laser on liquid crystal devices were investigated, and it was found that thermal deposition initially causes a reduction in phase retardation. The reduction can be restored under certain conditions by reducing the driving voltage. The study also provides methods to pre-compensate for the phase retardation decrease in specific LC devices.
Article
Physics, Applied
Qipeng Wang, Zhiguo Su, Shunli Li, Hongxin Zhao, Xiaoxing Yin
Summary: A tunable liquid crystal phase shifter based on opposed coplanar waveguide (OCPW) with excellent phase shift capability per wavelength is proposed. It has a simple structure, easy fabrication and miniaturization, and good transmission characteristics. The measurement results show that the proposed phase shifter achieves good performance at 14.5 GHz.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yi Liu, Yongmo Lv, Peng Li, Zhe Li, Jiahu Yuan, Haibo Jiang, Xiuhui Sun, Jianjun Chen, Zheng Yang, Shaoyun Yin
Summary: This paper proposes a method of continuous geometric phase modulation achieved through electrically tuning a liquid crystal display, demonstrating good consistency between simulation and experimental results, and achieving a phase modulation range of near 2π. This method is significant for dynamic geometric phase modulation in holographic display.
Article
Thermodynamics
I. A. Davletshin, O. A. Dushina, N. Mikheev, R. R. Shakirov
Summary: This paper investigates the mechanism of heat transfer in diverging channels and its relationship with fluid motion. The heat transfer coefficient data on the wall of a plane diverging channel at different expansion angles is generalized using the Stanton number, Reynolds number, and Kays acceleration parameter. Optical measurements and fluid dynamics analysis reveal the formation mechanism of heat transfer and the correlation between fluid dynamics and heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Zhi Hu, Zidan Zou, Aidi Xie, Chun Chen, Xiaoguang Zhu, Yunxia Zhang, Haimin Zhang, Huijun Zhao, Guozhong Wang
Summary: In this study, the Cu/CeO2-P catalyst exhibited the best catalytic performance in liquid-phase hydrogenation among three types of catalysts, attributed to a moderate SMSI effect leading to highly dispersed Cu on the external surface of ceria, affecting the chemical state of Cu species. The catalytic performance in liquid-phase hydrogenation was found to be intrinsically related to the crystal plane effect and reduced Cu proportion induced by an appropriate SMSI effect, which was different from gas-phase hydrogenation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Urice N. Tohgha, Ecklin P. Crenshaw, Michael E. McConney, Kyung Min Lee, Nicholas P. Godman
Summary: Nanoparticles of various shapes and sizes affect the optical properties and blue phase stabilization of BP liquid crystals. The dispersion of nanoparticles in the LC medium affects the position of the BP reflection band and the stabilization of BPs. The size and shape of nanomaterials greatly influence the interaction with LCs.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Optics
Hlib Kupianskyi, Simon A. R. Horsley, David B. B. Phillips
Summary: Multi-plane light converters (MPLCs) are a new class of optical devices that can convert a set of input spatial light modes to a new target set of output modes. They have potential applications in optical communications, optical computing, and optical imaging. We investigated high mode capacity MPLCs and developed a new inverse-design algorithm for better light control in these devices. Experimental results demonstrated the feasibility of prototype few-plane high-dimensional spatial mode sorters. Our work points to a promising future for high-dimensional MPLC-based technologies.
Article
Multidisciplinary Sciences
Xi Chen, Eva Korblova, Matthew A. Glaser, Joseph E. Maclennan, David M. Walba, Noel A. Clark
Summary: Surface interactions can structurally influence the polarization field of a ferroelectric fluid, allowing for the formation of high polarization states without the need for electric field poling. Different treatments can induce various polarization structures at the surface and within the cell, leading to a range of distinct modes of ferroelectric nematic electro-optic responses.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Quan He, Zhe Shen
Summary: In this study, a polarization-insensitive beam splitter with a variable split angle and ratio based on the phase gradient metasurface is proposed. It has the advantages of a small size and easy integration.
Article
Energy & Fuels
Tongbin Zhao, Zhe Ren, Kai Yang, Tao Sun, Lei Shi, Zhen Huang, Dong Han
Summary: The combustion characteristics and emission behaviors of RP-3 jet fuel were studied in a single-cylinder compression ignition engine. RP-3 jet fuel showed a retarded heat release and lagged combustion phase compared to diesel fuel, with a higher premixed combustion fraction leading to a higher first-stage heat release peak. RP-3 jet fuel also had a longer ignition delay time, shorter combustion duration, and earlier CA50 than diesel fuel. Higher EGR rates and delayed injection timing effectively reduced the NOx emissions of RP-3 jet fuel.
FRONTIERS IN ENERGY
(2023)
Article
Computer Science, Artificial Intelligence
Qiongan Zhang, Lei Shi, Peiyu Liu, Zhenfang Zhu, Liancheng Xu
Summary: In this paper, the authors propose an integrating consistency and difference networks (ICDN) method for multimodal sentiment analysis. The ICDN method models the interaction between different modalities through mapping and generalization learning, and uses a special cross-modal Transformer design to handle missing modal information. Unimodal sentiment labels are obtained through self-supervision to guide the sentiment analysis process. Experimental results demonstrate that the proposed method achieves better sentiment classification performance on the CMU-MOSI and CMU-MOSEI benchmark datasets.
APPLIED INTELLIGENCE
(2023)
Review
Education & Educational Research
Wilk Oliveira, Juho Hamari, Lei Shi, Armando M. Toda, Luiz Rodrigues, Paula T. Palomino, Seiji Isotani
Summary: The research shows that there are still some issues with personalized gamification designs in education, and more research is needed to improve them. Currently, most studies only consider students' gamer types to personalize the systems and lack sufficient statistical evidence. In future research, more attention should be paid to individual students' needs and learning performance to achieve better results.
EDUCATION AND INFORMATION TECHNOLOGIES
(2023)
Article
Energy & Fuels
Zhipeng Wang, Jing Zhao, Zishen Ye, Lei Shi
Summary: In this study, thermal analysis and experimental research were conducted to determine an optimized rod bundle channel with an open lattice structure. The chosen gas flow model was used to simulate the helium flow in the bundle channels, which showed satisfying results for the basic thermal analysis of a newly designed gas-cooled reactor.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Thermodynamics
Ling Leng, Zetai Ma, Jianghua Cheng, Lei Shi, Kangyao Deng
Summary: The stringent requirements for reducing CO2 emissions from internal combustion engines promote the development of waste heat recovery (WHR) technologies. Turbocompounding is a promising WHR technology offering fuel-saving potential along with low volume and weight requirements. This study investigates the coupling influence and mechanism of variable geometry turbocharger (VGT) turbine and power turbine (PT) regulation on recovery power and engine performance from the perspective of exhaust energy distribution. The study proposes cooperative control strategies of VGT rack position and PT speed under all operating conditions. The results show that increasing the VGT rack position and PT speed leads to a decrease in the proportion of exhaust energy distributed to the VGT turbine, which affects intake and exhaust conditions, resulting in changes in PT power and net engine output power.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Lei Shi, Xiaocheng Zhu, Zhaohui Du
Summary: The convective heat transfer characteristics of a cylinder with flow confinement under the impingement of a circumferentially arranged turbulent inclined circular air jet array are experimentally and numerically studied. The effect of the jet angle and the jet Reynolds number on the heat transfer behaviors of the cylindrical target surface is elucidated. The results show that the jet angle and Reynolds number significantly affect the heat transfer uniformity on the cylindrical surface.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Applied
Lekai Zhang, Ming Li, Yingfan Wang, Baixi Xing, Xiaojian Liu, Zhichuan Tang, Lei Shi
Summary: Extensive research has been conducted on the correlation between emotions and colors, resulting in the development of numerous color scheme recommendation tools. This study introduces Emocolor, a tool that utilizes emotional words or images to generate a wide range of color schemes, subsequently refining them through an interactive genetic algorithm to best align with user emotions. Emocolor effectively produces tram color schemes that resonate with user emotions and successfully translates the emotion of an image dominated by a single color into a tram color scheme.
COLOR RESEARCH AND APPLICATION
(2023)
Article
Engineering, Manufacturing
Libin Duan, Xiaotong Yang, Wei Xu, Zhanpeng Du, Xing Liu, Lei Shi, Dongkai Xu
Summary: This paper uses a generalised incremental stress state dependent damage model (GISSMO) to characterize the ductile failure behavior of hot formed steel under collision. The study validates the deformation patterns and key crashworthiness indexes of hot-rolled tube (HRT) through comparative research between experiments and simulations. To achieve lightweight potential, a variable-thickness rolled blanks hot-rolled tube (VRB-HRT) is proposed with consideration of ductile failure. The research findings show that considering ductile failure in the optimal design of VRB-HRT can better meet performance constraints.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2023)
Meeting Abstract
Ophthalmology
Xie LiJing, Dianlei Guo, Lei Shi, Chunqiao Liu
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Jiang Jiguang, Shi Lei, Su Chengzhi, Chang Chuan, Li Xiaotian, Hou Xiaolong, Tian Aixin
Summary: A decoupling method was developed in this study using continuous projection algorithm and support vector regression to analyze and detect the concentration of multiple pollutants in complex water bodies. The test results showed that the method achieved high detection accuracy.
LASER & OPTOELECTRONICS PROGRESS
(2023)
Article
Green & Sustainable Science & Technology
Ming Xu, Chunjing Bai, Lei Shi, Adis Puska, Andelka Stilic, Zeljko Stevic
Summary: This research investigated the sustainability of mountain lodges and used expert decision making and fuzzy methods for evaluation and ranking. The findings highlighted the importance of service quality and natural resource preservation. By providing insights into the current state of mountain tourism, this research offers guidelines for enhancing the mountain tourism experience.
Article
Engineering, Geological
Shi Lei, Zhang Xi-wei
Summary: This article introduces the development of a true triaxial apparatus for studying the deformation and fracture behavior of ultra-deep drilling cores. The apparatus is capable of investigating the stress-strain behavior, cyclic loading and unloading fracture behavior, and time-dependent deformation behavior of specimens processed by ultra-deep drilling cores under true triaxial stress. Through testing the cores from the Xiling engineering exploration hole at the Sanshandao Gold Mine, it was found that true triaxial cyclic loading and unloading weakened the brittle fracture characteristics of the specimen and induced anisotropic deformation in three directions.
ROCK AND SOIL MECHANICS
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Jialin Yu, Alexandra Cristea, Anoushka Harit, Zhongtian Sun, Olanrewaju Tahir Aduragba, Lei Shi, Noura Al Moubayed
Summary: This study proposes a generative XAI framework, INTERACTION, which presents explanations in two steps and achieves competitive results in experiments.
2022 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN)
(2022)
Proceedings Paper
Computer Science, Artificial Intelligence
Chenghao Xiao, Lei Shi, Alexandra Cristea, Zhaoxing Li, Ziqi Pan
Summary: Online course reviews play a key role in understanding students' perceptions about course quality, especially in the context of MOOCs. The proposed key idea extractor based on semantic units aims to improve the efficiency and effectiveness of analyzing large volumes of comments to extract key ideas and concerns expressed by students. This method provides high and stable coverage of students' ideas without relying on the verbatimness of their wording.
ARTIFICIAL INTELLIGENCE IN EDUCATION, PT I
(2022)
Proceedings Paper
Computer Science, Artificial Intelligence
Efthyvoulos Drousiotis, Panagiotis Pentaliotis, Lei Shi, Alexandra Cristea
Summary: This study explores methods to handle challenging continuous variables datasets and predicts student dropout in MOOCs. A fair comparison methodology is proposed, and the results show that discrete models outperform time-series models in predictive ability and have faster training and testing speed.
ARTIFICIAL INTELLIGENCE IN EDUCATION, PT I
(2022)
