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1,040 results on '"Kawanishi T"'

1. Future G Metasurface Antenna Using Dual Axis Galvo Scanner for Free Space Optical Control

Author

Bilal, A., Quddious, A., Antoniades, M. A., Kanno, A., Dat, P.T., Inagaki, K., Kawanishi, T., and Iezekiel, S.

Abstract

An optically reconfigurable metasurface antenna for Future G beam steering applications is demonstrated experimentally. Optical reconfigurability is achieved by using photodiode arrays to provide a photovoltage to varactors, which in turn provide the required phase shift to enable beam-steering. Illumination of the photodiodes is provided over free space by using a galvo scanner to deflect a laser beam which is delivered from a high-power laser via a multicore fiber. In addition to delivering power over fiber, the same multicore fiber is also used to deliver a 64-QAM 5G NR signal to the metasurface antenna unit. Measured EVM values ranging from 3% to 5.7% for a beam-steering range of 58° are obtained. The use of a galvo scanner for free space illumination of the metasurface antenna not only eliminates the requirement for on-antenna DC bias networks (thus reducing the system complexity), but also allows greater control over illumination of the photodiode arrays, resulting in continuous beam-steering over 58°.

Published
2024
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4. 300 GHz super heterodyne link over 645 m with frequency duplexing for point to point backhauls

Author

Renau, A., primary, Maye, C., additional, Wrana, D., additional, Haussmann, S., additional, Kallfass, I., additional, John, L., additional, Jung, B.K., additional, Hellrung, U., additional, Schlegel, P., additional, Kuerner, T., additional, Braun, R.P., additional, Leiba, Y., additional, Kawanishi, T., additional, Hisatake, S., additional, Kondou, K., additional, Szriftgiser, P., additional, and Ducournau, G., additional

Published
2023
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5. Tunable lithium niobate waveguide loop

Author

Chen, J X, Kawanishi, T, Higuma, K, Shinada, S, Hodiak, J, Izutsu, M, Chang, WSC, and Yu, PKL

Subjects
high quality (Q) factor, lithium niobate (LN) waveguide, resonator, tunable loop
Abstract

A novel, compact, and tunable lithium niobate (LN) planar waveguide loop structure composed of two Y junction reflectors is proposed for optical and radio frequency signal processing applications. The preliminary device shows a high quality factor of 6.5 x 10(4), due to the low propagation loss of the titanium-diffused LN waveguide. The tunability of the loop by electric field is estimated.

Published
2004

6. Full frequency duplex link over 645m in the 300 GHz band

Author

Renau, A, Maye, C, Wrana, D, Haussmann, S, Kallfass, I, John, L, Jung, B, Hellrung, U, Schlegel, P, Kuerner, T, Braun, R, Leiba, Y, Kawanishi, T, Hisatake, S, Kondou, K, Szriftgiser, P., Ducournau, Guillaume, Photonique THz - IEMN (PHOTONIQUE THZ - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), ThoR - TeraHertz end-to-end wireless systems supporting ultra high data Rate applications Numéro CORDIS : 814523 (Horizon 2020), Chaire Teril Waves, PCMP CHOP, and European Project: 814523,H2020,H2020-EUJ-2018,ThoR (2018)

Subjects
wireless millimetre/sub-mm technologies, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, THz, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience; We present here a demonstration of THz transmission system enabling a full frequency duplex link in the 300 GHz band. This system is coupling a super-heterodyne architecture, E-band modems and duplexing system at 300 GHz.; Nous présentons ici une démonstration d'un système de transmission THz permettant une liaison fréquentielle bidirectionnelle simultanée dans la bande des 300 GHz. Ce système associe une architecture super-hétérodyne, des modems en bande E et un système de duplexage à 300 GHz.

Published
2023

7. Full frequency duplex link in the 300 GHz band

Author

Renau, A, Maye, C, Wrana, D, Haussmann, S, Kallfass, I, John, L, Jung, B, Hellrung, U, Schlegel, P, Kuerner, T, Braun, R, Leiba, Y, Kawanishi, T, Hisatake, S, Kondou, K, Szriftgiser, P, Ducournau, Guillaume, Photonique THz - IEMN (PHOTONIQUE THZ - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), ThoR - TeraHertz end-to-end wireless systems supporting ultra high data Rate applications Numéro CORDIS : 814523 (Horizon 2020), Chaire Teril Waves, and European Project: 814523,H2020,H2020-EUJ-2018,ThoR (2018)

Subjects
wireless millimetre/sub-mm technologies, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, THz, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; We present here a demonstration of THz transmission system enabling a full frequency duplex link in the 300 GHz band. This system is coupling a super-heterodyne architecture, E-band modems and duplexing system at 300 GHz.; Nous présentons ici une démonstration d'un système de transmission THz permettant une liaison fréquentielle bidirectionnelle simultanée dans la bande des 300 GHz. Ce système associe une architecture super-hétérodyne, des modems en bande E et un système de duplexage à 300 GHz.

Published
2023

12. POS-891 HEMODIALYSIS PATIENTS WITH SEVERE COVID-19: REDUCED ANTIBODY RESPONSE

Author

BEPPU, H., primary, Fukuda, T., additional, Kawanishi, T., additional, Yasui, F., additional, Toda, M., additional, Kimura, H., additional, Ishiwatari, A., additional, Ogawa, T., additional, Abe, Y., additional, Endo, M., additional, Okamoto, K., additional, Hatakeyama, S., additional, Kohara, M., additional, and Wakai, S., additional

Published
2022
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16. 300 GHz transmission of E/V bands data-flows in the ThoR project

Author

Ducournau, Guillaume, Szriftgiser, P., Hisatake, S., Kallfass, I., Wrana, D., John, L., Braun, R.P., Leiba, Y., Kondou, K., Sasaki, S., Kawanishi, T., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Photonique THz - IEMN (PHOTONIQUE THZ - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), European Project: 814523,H2020,H2020-EUJ-2018,ThoR (2018), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)

Subjects
[PHYS]Physics [physics], stomatognathic diseases, [SPI]Engineering Sciences [physics], InformationSystems_MODELSANDPRINCIPLES, ComputingMilieux_THECOMPUTINGPROFESSION, GeneralLiterature_INTRODUCTORYANDSURVEY, health care facilities, manpower, and services, education, ComputingMilieux_COMPUTERSANDEDUCATION, ComputingMilieux_MISCELLANEOUS, health care economics and organizations
Abstract

ORAL-WORKSHOP; International audience

Published
2021

21. Screening of novel nuclear receptor agonists by a convenient reporter gene assay system using green fluorescent protein derivatives

Author

Suzuki, T., Nishimaki-Mogami, T., Kawai, H., Kobayashi, T., Shinozaki, Y., Sato, Y., Hashimoto, T., Asakawa, Y., Inoue, K., Ohno, Y., Hayakawa, T., and Kawanishi, T.

Subjects
Agonists (Biochemistry) -- Diagnosis -- Genetic aspects -- Research, Plant proteins -- Usage -- Research -- Genetic aspects, Biological sciences, Health, Science and technology
Abstract

Abstract Nuclear receptors represent a very good family of protein targets for the prevention and treatment of diverse diseases. In this study, we screened natural compounds and their derivatives, and [...]

Published
2006

32. Estimation of CO2 sequestration potential by afforestation in the arid rangelands of Western Australia based on long-term empirical data

Author

Suganuma, H., Aikawa, S-I, Sakai, Y., Hamano, H., Takahashi, N., Tahara, K., Kawarasaki, S., Utsugi, H., Egashira, Y., Kawanishi, T., Harper, R.J., Tanouchi, H., Kojima, T., Abe, Y., Saito, M., Kato, S., Law, J., Yamada, K., Suganuma, H., Aikawa, S-I, Sakai, Y., Hamano, H., Takahashi, N., Tahara, K., Kawarasaki, S., Utsugi, H., Egashira, Y., Kawanishi, T., Harper, R.J., Tanouchi, H., Kojima, T., Abe, Y., Saito, M., Kato, S., Law, J., and Yamada, K.

Abstract

Large-scale afforestation is a key measure to mitigate global warming, however, implementation may result in land-use competition with agriculture. To avoid such competition, carbon mitigation methods using arid and semi-arid areas have been proposed, but to our knowledge there is no report of rates of sequestration based on long-term observations from actual experimentation. In this study (1999–2015), in an arid area near Leonora, Western Australia (annual rainfall: 220 mm year−1; pan evaporation: 3400 mm year−1), carbon sequestration was assessed in above and below ground biomass in Eucalyptus camaldulensis under ambient conditions and with active site amelioration (combination of water harvesting with large mounds and hardpan blasting). The carbon sequestration rate was estimated at 7.92 Mg-CO2-e ha−1 year−1 for a total carbon sink of 230 Mg-CO2-e ha−1. Carbon mitigation may thus be a viable option in arid regions, not only in Western Australia but globally, and can be enhanced with active site engineering.

Published
2019

34. A Preliminary Study on Feasibility Radar Cross-Section of Foreign Object Debris for Size Classification.

Author

Ja’afar, P. N., Idrus, S. M., Ambran, S., Hamzah, A., Zulkifli, N., Hamid, N. A., Kanno, A., Shibagaki, N., Kashima, K., and Kawanishi, T.

Subjects
FOREIGN bodies, MAXWELL equations, ARTIFICIAL neural networks, RADAR, CYLINDER (Shapes)
Abstract

In this paper, a preliminary evaluation study is conducted, which aiming to investigate the radar cross-section (RCS) value that is capable to be used as an input parameter for Artificial Neural network (ANN) backpropagation for foreign object debris (FOD) size classification. The experimental work procedure for dataset acquisition is described. The FOD simulator is used as the FOD target which is made of metal cylinder shape with nine various dimensions and its RCS is defined by using Maxwell’s equation. The location varying backscattered electromagnetic field from each target is measured for RCS calibration purposes. It is found that by using the received signal from radar, which is the RCS of the target and its locations, it can be utilized as input parameters of backpropagation algorithms. The ANN classification application is to define its size by the ranges; small (-30.99 to -21 dBsm), medium (-20.99 to -11 dBsm), and large (-10.99 to 0 dBsm). The interference signal getting from measurement (22.46 to 25.2 dBsm) exhibited good reflectivity behavior. The acquired input showed to be useful for ANN for FOD size classification. [ABSTRACT FROM AUTHOR]

Published
2021

44. The TRMM Precipitation Radar: Opportunities and Challenges

Author

Meneghini, R, Kozu, T, Kawanishi, T, Kuroiwa, H, Okamoto, K, and Atlas, D

Subjects
Communications And Radar
Abstract

Although studies on the feasibility of spaceborne weather radar date back to the 1960's, it was only with the launch of the Tropical Rainfall Measuring Mission (TRMM) Satellite in November 1997 that the first weather radar was placed into low earth orbit. The long delay between the initial concept and implementation was caused not only by the demanding requirements of active sensors such as mass, power, and reliability, but because of scientific and technological challenges. For example, the demand for adequate spatial resolution arises from the need to resolve the horizontal structure of convective storm cells and to avoid surface contamination of the rain return at off-nadir angles. To achieve a horizontal resolution on the order of 4 km from low earth orbit with a modest antenna size of 2 m requires the use of a much higher frequency (Ku-band) than those typically used for ground-based weather radars (S- and C-band). Higher frequencies are subject to higher attenuation. As Hitschfeld and Bordan (1954) showed in their classic paper, attenuation correction with a single-wavelength radar is inherently unstable at high attenuations unless the drop size distribution and the radar constant are known precisely. Since these conditions are seldom met, much work over the last decade has been devoted to formulating and testing alternative methods of attenuation correction. The operational method used in the TRMM radar processing is discussed in section 3 of the paper.

Published
1999

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