Article
Engineering, Chemical
Przemyslaw Luty, Mateusz Pronczuk, Katarzyna Bizon
Summary: This study analyzed the size of gas bubbles in liquids using different shape recognition methods. The results showed that the combination of image binarization and Canny edge detection, along with volumetric equivalent diameter, produced the most accurate results when determining the bubble size experimentally.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Multidisciplinary Sciences
Alexander Goncharsky, Anton Goncharsky, Dmitry Melnik, Svyatoslav Durlevich
Summary: This paper focuses on the development of flat diffractive optical elements (DOEs) for protecting banknotes, documents, plastic cards, and securities against counterfeiting. The microrelief of a DOE must be asymmetric to form images consisting of several symbols (digits or letters). The DOEs developed in this work are securely protected against counterfeiting and can be replicated hundreds of millions of times using standard equipment.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Illsoo Sohn, Muhammad Fithratur Rahman, Yong Hun Jang, Sang Hyun Lee
Summary: This article introduces a novel optical wireless framework for Internet of Things (IoT) biotelemetry, using an implantable medical device (IMD) to capture in-body electrocardiogram (ECG) and transmit it through optical wireless communication. The optical IMD design achieves sub-milliwatt-level power consumption and allows seamless long-term ECG monitoring with limited battery capacity, resulting in improved diagnostic accuracy. In vivo experiments verify the viability of the IMD prototype for real-time biotelemetry, with the added benefit of ultra-low-power optical emission being harmless to the body.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Engineering, Electrical & Electronic
Andrey G. Okhrimchuk, Vladislav V. Likhov, Sergei A. Vasiliev, Andrey D. Pryamikov
Summary: The first experimental manifestation of helical Bragg grating (HBG) has been demonstrated, which can generate and filter vortex light. By adjusting the parameters of the waveguide, a reflected wave with predetermined wavelength and OAM change can be excited.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Brian A. Freno, Brian R. Carnes, V. Gregory Weirs
Summary: The study of hypersonic flows and their underlying aerothermochemical reactions is crucial for the design and analysis of vehicles entering and exiting Earth's atmosphere. Computational physics codes can simulate these phenomena, but verification is essential to ensure their accuracy and credibility. This paper presents code-verification techniques for hypersonic reacting flows in thermochemical nonequilibrium, demonstrating their effectiveness on the Sandia Parallel Aerodynamics and Reentry Code (SPARC).
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Water Resources
Inga Berre, Wietse M. Boon, Bernd Flemisch, Alessio Fumagalli, Dennis Glaeser, Eirik Keilegavlen, Anna Scotti, Ivar Stefansson, Alexandru Tatomir, Konstantin Brenner, Samuel Burbulla, Philippe Devloo, Omar Duran, Marco Favino, Julian Hennicker, I-Hsien Lee, Konstantin Lipnikov, Roland Masson, Klaus Mosthaf, Maria Giuseppina Chiara Nestola, Chuen-Fa Ni, Kirill Nikitin, Philipp Schadle, Daniil Svyatskiy, Ruslan Yanbarisov, Patrick Zulian
Summary: Flow in fractured porous media has significant impacts on the underground, biological tissues, and man-made materials. Recently, there has been a development of models and numerical methods to explicitly consider the influence of fractures on flow processes. Four benchmark cases were presented to test the capabilities of numerical methods in handling the complexities common to the geometrical structures of fracture networks, with results obtained from 17 numerical methods collected and analyzed.
ADVANCES IN WATER RESOURCES
(2021)
Article
Computer Science, Hardware & Architecture
Jialiang Jin, Dezhi Zhang, Qizheng Li, Mingbo He, Yuanfeng Mao, Qihong Wu, Zeru Wu, Xu Wang, Zhen Dong, Yanbo Li, Zhicheng Ye, Jian Jian
Summary: This paper proposes an on-board integrated optics (OBO) scheme within a 50G/10G combo PON system, which achieves high port density, low cost, and low power consumption required for the 50G PON system. The OBO scheme integrates record-high power DFB lasers, low insertion loss silicon modulators, a planar lightwave circuit wavelength-division multiplexer, and avalanche photodiodes on a single board, solving key issues faced by the coexistence and smooth evolution from 10G to 50G PON.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Ecology
Chang. S. Zhao, Xu Pan, Sheng. T. Yang, Hua Xiang, Jin Zhao, Xin. J. Gan, Su. Y. Ding, Qiang Yu, Yang Yang
Summary: Healthy river ecosystems are crucial for sustainable water resource management. Maintaining sufficient environmental flow is key to protecting river health amid intensifying climate change and human activities. The study suggests that a combined approach using methods like Tennant, WP, and AEHRA can accurately estimate e-flow and verify river health, offering a scientific basis for ecological river restoration projects.
Article
Computer Science, Information Systems
Quan-Lin Gu, Sai Yang, Tianxing Yu
Summary: This article proposes a method called LGNMNet, which combines the Lite General Network and MagFace CNN models, to predict the possibility of video frames belonging to micro-expression intervals. The experimental results show that this method achieves state-of-the-art performance in spotting micro-expressions in long videos.
MULTIMEDIA SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Yong Hu, Mariangela Baggio, Shahab Oddin Dabironezare, Aleksi Tamminen, Brandon Toy, Juha Ala-Laurinaho, Elliott R. Brown, Nuria Llombart, Sophie X. Deng, Vincent P. Wallace, Zachary D. Taylor
Summary: This article presents a system concept for online alignment verification of millimeter-wave, corneal reflectometry. The system uses beam scanning to generate reflectivity maps of the cornea and compares them to a precomputed/measured template map to confirm alignment. The results show that the system can achieve accurate position measurement to a high degree.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Francesco Sansone, Francesco Branz, Andrea Vettor, Edoardo Birello, Gian Paolo Guizzo, Riccardo Antonello, Alessandro Francesconi
Summary: This paper presents the experimental verification of a pointing and tracking system for a small satellite optical communication terminal. The system consists of a dual stage pointing mechanism and has been calibrated and tested in laboratory conditions.
Article
Chemistry, Multidisciplinary
Axel Guenther, Murat Baran, Wolfgang Kowalsky, Bernhard Roth
Summary: By adjusting the curing time of the self-written waveguide, material parameters can be controlled, affecting the optical response with temperature changes. Limiting the curing time changes the internal conditions that cause an increase in optical transmission.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Khen Cohen, Gal Hodeda, Emmanuel Almog, Dan Raviv, David Mendlovic
Summary: This work introduces hardware metrics to evaluate the ability of an imaging sensor (camera) to handle temporal change. By focusing on parameters such as sampling frequency, signal to noise ratio, rolling shutter, and modulation transfer function, the quality of motion sensing can be evaluated and compared. The study also examines existing hardware used in modern equipment and presents findings.
Article
Computer Science, Artificial Intelligence
Zhigang Tu, Hongyan Li, Wei Xie, Yuanzhong Liu, Shifu Zhang, Baoxin Li, Junsong Yuan
Summary: Video super-resolution is an active research topic in computer vision, aiming to improve the resolution of videos using techniques like optical flow for motion compensation. This comprehensive review explores the role of optical flow in video super-resolution and highlights the use of deep learning methods in this field.
ARTIFICIAL INTELLIGENCE REVIEW
(2022)
Article
Mining & Mineral Processing
Jian Liu, Qichao Zhou, Dong Wang, Lijun Deng, Ke Gao
Summary: A cavity flow algorithm is proposed to accurately describe the gas flow state in a new-born goaf. The feasibility of the algorithm is verified through experiments.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)