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Near-Infrared I/II Nanophosphors with Cr3+/Ni2+ Energy Transfer for Bioimaging

Advanced Optical Materials 2023年第15期11卷

作者： Satpathy, Aishwarya Huang, Wen-Tse Chan, Ming-Hsien Su, Ting-Yi Kamiński, Mikolaj Majewska, Natalia Mahlik, Sebastian Leniec, Grzegorz Kaczmarek, Slawomir M. Hsiao, Michael Liu, Ru-Shi Department of Chemistry National Taiwan University Taipei106 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Academia Road 128 Nankang Taipei115 Taiwan Genomics Research Center Academia Sinica Academia Road Section 2 Nankang Taipei115 Taiwan Institute of Experimental Physics Faculty of Mathematics Physics and Informatics University of Gdansk Wita Stwosza 57 Gdansk80–308 Poland Department of Technical Physics Faculty of Mechanical Engineering and Mechatronics West Pomeranian University of Technology in Szczecin al. Piastow 19 Szczecin70–310 Poland

In the biomedical field, the use of fluorescence imaging in the second near-infrared (NIR-II) region is growing rapidly because it imparts the advantages of reduced autofluorescence and low photon scattering. The advantage of reduced scattering is that it increases penetration depth in vivo and improves imaging clarity. Herein, this work uses mesoporous silica, a biocompatible template that can be easily modified, functionalized, and loaded with drugs for use in several bioapplications. The ZnGa2O4 spinel oxide system is integrated into mesoporous silica and different concentrations of Cr3+ and Ni2+ are loaded in octahedral sites to obtain the highest emission intensity in the NIR-II region at 1285 nm via energy transfer from Cr3+ to Ni2+. Given that only a few nanophosphor systems with emission in the NIR-II region are available, this work attempts to establish emission in the NIR-II and NIR-I regions to obtain images in vivo with an increased penetration depth to 5 mm and improved clarity for bioimaging purposes. This system will open the door for biomedical research on other NIR-II nanophosphors. © 2023 Wiley-VCH GmbH.

关键词： Bioimaging

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A Normal Distribution Transform-Based Radar Odometry Designed For Scanning and Automotive Radars

arXiv

引用

arXiv 2021年

作者： Kung, Pou-Chun Wang, Chieh-Chih Lin, Wen-Chieh Graduate Degree Program of Robotics National Chiao Tung University Hsinchu Taiwan Department of Electrical and Computer Engineering National Chiao Tung University The Mechanical and Mechatronics Systems Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan Department of Computer Science National Chiao Tung University Hsinchu Taiwan

Existing radar sensors can be classified into automotive and scanning radars. While most radar odometry (RO) methods are only designed for a specific type of radar, our RO method adapts to both scanning and automotive radars. Our RO is simple yet effective, where the pipeline consists of thresholding, probabilistic submap building, and an NDT-based radar scan matching. The proposed RO has been tested on two public radar datasets: the Oxford Radar RobotCar dataset and the nuScenes dataset, which provide scanning and automotive radar data respectively. The results show that our approach surpasses state-of-the-art RO using either automotive or scanning radar by reducing translational error by 51% and 30%, respectively, and rotational error by 17% and 29%, respectively. Besides, we show that our RO achieves centimeter-level accuracy as lidar odometry, and automotive and scanning RO have similar accuracy. Copyright © 2021, The Authors. All rights reserved.

关键词： Optical radar

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Enhancement of Self-Trapped Exciton and Near-Infrared Emission in Bi3+/Er3+ Co-Doped Cs2Ag0.4Na0.6InCl6 Double Perovskite for Optical Telecommunications

SSRN

引用

SSRN 2022年

作者： Dave, Kashyap Huang, Wen-Tse Leśniewski, Tadeusz Lazarowska, Agata Grzegorczyk, Maciej Mahlik, Sebastian Leniec, Grzegorz Kaczmarek, Slawomir M. Liu, Ru-Shi Department of Chemistry National Taiwan University Taipei106 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica National Taiwan University Taipei115 Taiwan Institute of Experimental Physics Faculty of Mathematics Physics and Informatics University of Gdańsk Gdańsk80-308 Poland Department of Technical Physics Faculty of Mechanical Engineering and Mechatronics West Pomeranian University of Technology in Szczecin Piastow 48 Szczecin70-311 Poland Advanced Research Center of Green Materials Science and Technology National Taiwan University Taipei106 Taiwan

Erbium (Er) complexes are used as optical gain material for signal generation in the telecom C-band at 1540 nm, but they need a sensitizer to enhance absorption. Na+ substitution at Ag+ and Bi3+ doping at the In3+ site are possible strategies to enhance broadband emission in Cs2AgInCl6, which could be used as sensitizers to energy transfer into rare-earth elements. Herein, self-trapped exciton (STE) energy transfer to Er3+ at 1540 nm for low loss optical telecommunication applications is reported. An acid precipitation method is used to synthesize Cs2AgInCl6 and its derivative with Er3+, Bi3+, and Na+. Bare Cs2AgInCl6:Er emission signals are found to be weak at 1540 nm, but Bi3+ doping increased by 12 times, and Bi3+ and Na+ doping increased by up to 25 times signal intensity. Electron paramagnetic resonance spectroscopy characterized a decrease in axial symmetry over the Er3+ ion after substitutions of Na+ and Bi3+ in Cs2AgInCl6 at low temperature ( © 2022, The Authors. All rights reserved.

关键词： Bismuth compounds

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Measuring 60-pc-scale Star Formation Rate of the Nearby Seyfert Galaxy NGC 1068 with ALMA, HST, VLT/MUSE, and VLA

arXiv

引用

arXiv 2024年

作者： Nagashima, Yuzuki Saito, Toshiki Ikarashi, Soh Takano, Shuro Nakanishi, Kouichiro Harada, Nanase Nakajima, Taku Taniguchi, Akio Tosaki, Tomoka Bamba, Kazuharu Physics and Mechatronics Course Major in Symbiotic Systems Science and Technology Graduate School of Symbiotic Systems Science and Technology Fukushima University 1 Kanayagawa Fukushima Fukushima960-1296 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Faculty of Global Interdisciplinary Science and Innovation Shizuoka University 836 Ohya Suruga-ku Shizuoka422-8529 Japan Department of Physics General Studies College of Engineering Nihon University Tamura-machi Fukushima Koriyama963-8642 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-1855 Japan Institute for Space-Earth Environmental Research Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Department of Physics Graduate School of Science Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8602 Japan Department of Geoscience Joetsu University of Education Yamayashiki-machi Niigata Joetsu943-8512 Japan

Star formation rate (SFR) is a fundamental parameter for describing galaxies and inferring their evolutionary course. H II regions yield the best measure of instantaneous SFR in galaxies, although the derived SFR can have large uncertainties depending on tracers and assumptions. We present an SFR calibration for the entire molecular gas disk of the nearby Seyfert galaxy NGC 1068, based on our new high-sensitivity ALMA 100 GHz continuum data at 55 pc (= 0′′ . 8) resolution in combination with the HST Paα line data. In this calibration, we account for the spatial variations of dust extinction, electron temperature of H II regions, AGN contamination, and diffuse ionized gas (DIG) based on publicly available multi-wavelength data. Especially, given the extended nature and the possible non-negligible contribution to the total SFR, a careful consideration of DIG is essential. With a cross-calibration between two corrected ionized gas tracers (free-free continuum and Paα), the total SFR of the NGC 1068 disk is estimated to be 3.2 ± 0.5 M☉ yr−1, one-third of the SFR without accounting for DIG (9.1 ± 1.4 M☉ yr−1). We confirmed high SFR around the southern bar-end and the corotation radius, which is consistent with the previous SFR measurements. In addition, our total SFR exceeds the total SFR based on 8 µm dust emission by a factor of 1.5. We attribute this discrepancy to the differences in the young stars at different stages of evolution traced by each tracer and their respective timescales. This study provides an example to address the various uncertainties in conventional SFR measurements and their potential to lead to significant SFR miscalculations. © 2024, CC0.

关键词： Galaxies

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Techniques of Indoor Positioning Systems (IPS): A Survey

Techniques of Indoor Positioning Systems (IPS): A Survey

引用

Advances in Science and engineering Technology International Conferences (ASET)

作者： Fares Alkhawaja Mohammad Jaradat Lotfi Romdhane Mechatronics Graduate Program College of Engineering American University of Sharjah Sharjah UAE

Indoor Localization has been a challenging task in robotics for years, due to the obstruction of the GPS signals. Although multiple techniques have been proposed, determining the best among them is still highly dependent on applications and no best solution is agreed on. One technique, researchers and developers are adopting -especially in the robotics field-, is the visual/inertial sensor fusion. However, the high number of these systems and their diversity, makes selecting the adequate one for an application a challenging task. This paper aims at presenting an exhaustive list indoor positioning techniques with more emphasis on visual/depth sensors, along with some recommendations for selected applications.

关键词： Robot sensing systems Cameras Receivers Global navigation satellite system Wireless fidelity Visualization

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Radar Occupancy Prediction with Lidar Supervision while Preserving Long-Range Sensing and Penetrating Capabilities

arXiv

引用

arXiv 2021年

作者： Kung, Pou-Chun Wang, Chieh-Chih Lin, Wen-Chieh The Graduate Degree Program of Robotics National Yang Ming Chiao Tung University Hsinchu Taiwan The Department of Electrical and Computer Engineering National Yang Ming Chiao Tung University Taiwan The Mechanical and Mechatronics Systems Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan The Department of Computer Science National Yang Ming Chiao Tung University Hsinchu Taiwan

Radar shows great potential for autonomous driving by accomplishing long-range sensing under diverse weather conditions. But radar is also a particularly challenging sensing modality due to the radar noises. Recent works have made enormous progress in classifying free and occupied spaces in radar images by leveraging lidar label supervision. However, there are still several unsolved issues. Firstly, the sensing distance of the results is limited by the sensing range of lidar. Secondly, the performance of the results is degenerated by lidar due to the physical sensing discrepancies between the two sensors. For example, some objects visible to lidar are invisible to radar, and some objects occluded in lidar scans are visible in radar images because of the radar's penetrating capability. These sensing differences cause false positive and penetrating capability degeneration, respectively. In this paper, we propose training data preprocessing and polar sliding window inference to solve the issues. The data preprocessing aims to reduce the effect caused by radar-invisible measurements in lidar scans. The polar sliding window inference aims to solve the limited sensing range issue by applying a near-range trained network to the long-range region. Instead of using common Cartesian representation, we propose to use polar representation to reduce the shape dissimilarity between long-range and near-range data. We find that extending a near-range trained network to long-range region inference in the polar space has 4.2 times better IoU than in Cartesian space. Besides, the polar sliding window inference can preserve the radar penetrating capability by changing the viewpoint of the inference region, which makes some occluded measurements seem non-occluded for a pretrained network. Copyright © 2021, The Authors. All rights reserved.

关键词： Optical radar

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Prediction of anterior cruciate ligament injury from MRI using deep learning

Prediction of anterior cruciate ligament injury from MRI usi...

引用

International Forum on Medical Imaging in Asia 2021, IFMIA 2021

作者： Truong, Nguyen Khanh Hung Nguyen, Thuan Phuoc Kha, Quang Hien Le, Ngoc Hoang Le, Van Tuan Cao, Thi Luu, Ho Thanh Lam Le, Nguyen Quoc Khanh Kang, Jiunn-Horng International Master/Ph.D. Program in Medicine College of Medicine Taipei Medical University Taipei Taiwan Department of Orthopedic and Trauma Cho Ray Hospital Ho Chi Minh city Viet Nam Mechatronics Engineering Ho Chi Minh City University of Technology Ho Chi Minh city Viet Nam Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei Taiwan Orthopedic and Rehabilitation Department University of Medicine and Pharmacy at Ho Chi Minh city Ho Chi Minh city Viet Nam Children's Hospital 2 Ho Chi Minh City Viet Nam Professional Master Program in Artificial Intelligence in Medicine College of Medicine Taipei Medical University Taipei Taiwan Research Center for Artificial Intelligence in Medicine Taipei Medical University Taipei Taiwan Department of Physical Medicine and Rehabilitation Taipei Medical University Hospital Taipei Taiwan Department of Physical Medicine and Rehabilitation School of Medicine College of Medicine Taipei Medical University Taipei Taiwan

ISBN: (数字)9781510644212

ISBN: (纸本)9781510644205

Knee injury emerges as one of the most common diseases, causing dislocation of knee joints, immobility, etc., in which the anterior cruciate ligament (ACL) injury is the most common one. The development of various artificial intelligence (AI) frameworks gained enormous attention in many areas, including injury prediction and health management via medical image analysis. The objective of the current study is to focus on a comprehensive high accurate prediction of ACL injury based on MRI medical images, and also demonstrate the ability of AI in practical and outline conceptual prediction and diagnosis frameworks for other types of knee injuries in the future. Our dataset comprised of knee MRI reports from Cho Ray Hospital, Vietnam which are composed of ACL and non-ACL injury patients. The MRI images were used as supporting data in the deep learning classification model with DenseNet-121 algorithm. The successful establishment of an ACL injury diagnosis model from MRI will pave the way for us to develop more diagnostic models of other injuries in the body as well as the prediction of bone diseases. © 2021 SPIE.

关键词： Magnetic resonance imaging

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Evaluation of the Electric Field Distribution during Bending for Wearable Two-Dimensional Communication Sheets in the 2.4-GHz Band

Evaluation of the Electric Field Distribution during Bending...

引用

IEEE Global Conference on Consumer Electronics (GCCE)

作者： Ibuki Uda Katsuyuki Fujii Yasuyuki Okumura Graduate Program of Mechatronics Graduate School of Science and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Japan

ISBN: (数字)9781728135755

ISBN: (纸本)9781728135762

A communication medium known as a wearable two-dimensional communication sheet that can locate multiple small devices on clothes is being researched. By wearing the sheet, the desired communication may not be achieved because the sheet is bent owing to human movement. Therefore, in this study, we employ the finite-difference time-domain (FDTD) method to evaluate the electric field distribution inside the sheet in the 2.4-GHz band by considering the bending angle of the sheet to be a parameter.

关键词： Electric fields Finite difference methods Time-domain analysis Insulators Sensors Surface waves

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Superposition of Next Generation PON to Existing PON's OOK Signals

Superposition of Next Generation PON to Existing PON's OOK S...

引用

IEEE Global Conference on Consumer Electronics (GCCE)

作者： Shoki Ogawa Yasuyuki Okumura Katsuyuki Fujii Graduate Program of Mechatronics Graduate school of Sience and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Japan

ISBN: (数字)9781728135755

ISBN: (纸本)9781728135762

Recent research into raising the speed and capacity of optical access networks has focused on converting RF (Radio Frequency) signals into optical signals. One approach to efficient transmission, combining wide spread OOK (ON-OFF Keying) systems with phase modulation, is being actively researched. However, studies to date have considered only the downlink. This paper focuses on the uplink of optical access networks and proposes a method for demodulating superimposed OOK and phase modulation signals.

关键词： Optical modulation Phase shift keying Passive optical networks Optical distortion Uplink

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Evaluation of TCM to Coexisting OOK and PSK in Optical Access

Evaluation of TCM to Coexisting OOK and PSK in Optical Acces...

引用

IEEE Global Conference on Consumer Electronics (GCCE)

作者： Yuki Kuno Yasuyuki Okumura Katsuyuki Fujii Graduate Program of Mechatronics Graduate school of Sience and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Japan

ISBN: (数字)9781728135755

ISBN: (纸本)9781728135762

Studies for enhancing network speed and capacity to handle the rapid increases in traffic are being conducted. Even in optical access, which is the backbone network, studies on next generation modulation schemes that utilize phase and amplitude, rather than modulation by conventional light intensity, are being conducted. However, it is difficult to update all the terminals at once, and there is a possibility that signals with old and new modulation schemes coexist on one optical fiber. Such situations are known to yield high error rates. Therefore, this study evaluates the effectiveness of TCM (Trellis Coded Modulation), which is an error correcting scheme.

关键词： Adaptive optics Error analysis Modulation Optical network units Passive optical networks Extinction ratio Optical fibers

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