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2,128 results on '"Kobayashi, Jun"'

11. Spatial and temporal distribution of reported dengue cases and hot spot identification in Quezon City, Philippines, 2010–2017

Author

Medina, John Robert C., Takeuchi, Rie, Mercado, Chris Erwin G., de los Reyes, Calvin S., Cruz, Rolando V., Abrigo, Melvin D. R., Hernandez, Paul Michael R., Garcia, Jr., Fernando B., Salanguit, Mika, Gregorio, Jr., Ernesto R., Kawamura, Shin’ya, Hung, Khew Ee, Kaneko, Masami, Nonaka, Daisuke, Maude, Richard J., and Kobayashi, Jun

Published
2023
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15. Content analysis of health-related subjects in the K12 school curricula of Japan, Indonesia, Philippines, Guam, Micronesia, Marshall Islands, Palau, and Fiji

Author

Nishio, Akihiro, Shibuya, Fumiko, de los Reyes, Calvin S., Estrada, Crystal Amiel M., Gregorio, Jr, Ernesto R., Sari, Dian Puspita, Warnaini, Cut, Kadriyan, Hamsu, Cruz, Maria Sandra M., Hattori-Uchima, Margaret, Dacanay, Paul, Dacanay, Rudelyn, Enos, Hillia Langrine, Ngirmang, Tarmau Terry, Khalif, Mohamed, Volavola, Saula Golea, Tomokawa, Sachi, Kigawa, Mika, and Kobayashi, Jun

Published
2023
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17. Measurement of the variation of electron-to-proton mass ratio using ultracold molecules produced from laser-cooled atoms

Author

Kobayashi, Jun, Ogino, Atsushi, and Inouye, Shin

Subjects
Physics - Atomic Physics
Abstract

Experimental techniques to manipulate cold molecules have seen great development in recent years. The precision measurements of cold molecules are expected to give insights into fundamental physics. We use a rovibrationally pure sample of ultracold KRb molecules to improve the measurement on the stability of electron-to-proton mass ratio ($\mu = \frac{m_{\rm e}}{M_{\rm p}}$). The measurement is based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between nearly a degenerate pair of vibrational levels each associated with a different electronic potential. Observed limit on temporal variation of $\mu$ is $\frac{1}{\mu}\frac{d\mu}{dt} = (0.30\pm1.0) \times 10^{-14}$ year$^{-1}$, which is better by a factor of five compared with the most stringent laboratory molecular limits to date. Further improvements should be straightforward, because our measurement was only limited by statistical errors., Comment: 10 pages, 4 figures

Published
2019
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18. Current-feedback-stabilized laser system for quantum simulation experiments using Yb clock transition at 578 nm

Author

Takata, Yoshihiro, Nakajima, Shuta, Kobayashi, Jun, Ono, Koki, Amano, Yoshiki, and Takahashi, Yoshiro

Subjects
Physics - Atomic Physics, Condensed Matter - Quantum Gases, Quantum Physics
Abstract

We developed a laser system for the spectroscopy of the clock transition in ytterbium (Yb) atoms at 578 nm based on an interference-filter stabilized external-cavity diode laser (IFDL) emitting at 1156 nm. Owing to the improved frequency-to-current response of the laser-diode chip and the less sensitivity of the IFDL to mechanical perturbations, we succeeded in stabilizing the frequency to a high-finesse ultra-low-expansion glass cavity with a simple current feedback system. Using this laser system, we performed high-resolution clock spectroscopy of Yb and found that the linewidth of the stabilized laser was less than 320 Hz., Comment: 5 pages, 7 figures

Published
2019
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20. Antiferromagnetic Interorbital Spin-Exchange Interaction of $^{171}$Yb

Author

Ono, Koki, Kobayashi, Jun, Amano, Yoshiki, Sato, Koji, and Takahashi, Yoshiro

Subjects
Condensed Matter - Quantum Gases
Abstract

We report on the investigation of the scattering properties between the ground state $^1S_0$ and the metastable state $^3P_0$ of the fermionic isotope of $^{171}$Yb. We successfully measure the $s$-wave scattering lengths in the two-orbital collision channels as $a_{eg}^+=225(13)a_0$ and $a_{eg}^-=355(6)a_0$, using the clock transition spectroscopy in a three-dimensional optical lattice. The result shows that the interorbital spin-exchange interaction is antiferromagnetic, indicating that $^{171}$Yb atom is a promising isotope for the quantum simulation of the Kondo effect with the two-orbital system., Comment: 7 pages, 7 figures

Published
2018
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21. Experimental Determination of Bose-Hubbard Energies

Author

Nakamura, Yusuke, Takasu, Yosuke, Kobayashi, Jun, Asaka, Hiroto, Fukushima, Yoshiaki, Inaba, Kensuke, Yamashita, Makoto, and Takahashi, Yoshiro

Subjects
Condensed Matter - Quantum Gases
Abstract

We present the first experimental measurement of the ensemble averages of both the kinetic and interaction energies of the three-dimensional Bose--Hubbard model at finite temperature and various optical lattice depths across weakly to strongly interacting regimes, for an almost unit filling factor. The kinetic energy is obtained through Fourier transformation of a time-of-flight signal, and the interaction energy is measured using a newly developed atom-number-projection spectroscopy technique, by exploiting an ultra-narrow optical transition of two-electron atoms. The obtained experimental results can be used as benchmarks for state-of-the-art numerical methods of quantum many-body theory. As an illustrative example, we compare the measured energies with numerical calculations involving the Gutzwiller and cluster-Gutzwiller approximations, assuming realistic trap potentials and particle numbers at nonzero entropy (finite temperature); we obtain good agreement without fitting parameters. We also discuss the possible application of this method to temperature estimations for atoms in optical lattices using the thermodynamic relation. This study offers a unique advantage of cold atom system for `quantum simulators', because, to the best of our knowledge, it is the first experimental determination of both the kinetic and interaction energies of quantum many-body system., Comment: 22 pages, 20 figures

Published
2018
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26. Site-resolved imaging of single atoms with a Faraday quantum gas microscope

Author

Yamamoto, Ryuta, Kobayashi, Jun, Kato, Kohei, Kuno, Takuma, Sakura, Yuto, and Takahashi, Yoshiro

Subjects
Condensed Matter - Quantum Gases, Physics - Atomic Physics
Abstract

We successfully demonstrate a quantum gas microscopy using the Faraday effect which has an inherently non-destructive nature. The observed Faraday rotation angle reaches 3.0(2) degrees for a single atom. We reveal the non-destructive feature of this Faraday imaging method by comparing the detuning dependence of the Faraday signal strength with that of the photon scattering rate. We determine the atom distribution with deconvolution analysis. We also demonstrate the absorption and the dark field Faraday imaging, and reveal the different shapes of the point spread functions for these methods, which are fully explained by theoretical analysis. Our result is an important first step towards an ultimate quantum non-demolition site-resolved imaging and furthermore opens up the possibilities for quantum feedback control of a quantum many-body system with a single-site resolution., Comment: 8 pages, 8 figures

Published
2016
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27. Key technologies for future sodium-cooled fast reactors

Author

Aizawa, Kosuke, primary, Ando, Masanori, additional, Chikazawa, Yoshitaka, additional, Doda, Norihiro, additional, Enuma, Yasuhiro, additional, Ezure, Toshiki, additional, Fukano, Yoshitaka, additional, Hamase, Erina, additional, Hirooka, Shun, additional, Hiyama, Tomoyuki, additional, Ishii, Katsunori, additional, Kaito, Takeji, additional, Kamiyama, Kenji, additional, Kikuchi, Norihiro, additional, Kobayashi, Jun, additional, Kubo, Shigenobu, additional, Kurihara, Akikazu, additional, Maruyama, Shuhei, additional, Matsushita, Kentaro, additional, Mori, Takero, additional, Morita, Koji, additional, Ohira, Hiroaki, additional, Ohki, Shigeo, additional, Okajima, Satoshi, additional, Okano, Yasushi, additional, Onizawa, Takashi, additional, Ono, Ayako, additional, Ozawa, Takayuki, additional, Seino, Hiroshi, additional, Takata, Takashi, additional, Takaya, Shigeru, additional, Takeuchi, Masayuki, additional, Tanaka, Masaaki, additional, Taninaka, Hiroshi, additional, Tanno, Takashi, additional, Toyota, Kodai, additional, Uchibori, Akihiro, additional, Uwaba, Tomoyuki, additional, Wakai, Takashi, additional, Watakabe, Tomoyoshi, additional, Yada, Hiroki, additional, Yamamoto, Tomohiko, additional, Yamano, Hidemasa, additional, Yokoyama, Kenji, additional, Yoshikawa, Ryuji, additional, Yoshimura, Kazuo, additional, Hashidate, Ryuta, additional, Sano, Yuichi, additional, and Seki, Akiyuki, additional

Published
2022
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28. Contributors

Author

Aizawa, Kosuke, primary, Ando, Masanori, additional, Ashida, Takashi, additional, Chikazawa, Yoshitaka, additional, Doda, Norihiro, additional, Enuma, Yasuhiro, additional, Ezure, Toshiki, additional, Fukano, Yoshitaka, additional, Gondai, Yoji, additional, Hamase, Erina, additional, Hashidate, Ryuta, additional, Hazama, Taira, additional, Hirooka, Shun, additional, Hiyama, Tomoyuki, additional, Inoue, Masaki, additional, Ishii, Katsunori, additional, Ishikawa, Hiroki, additional, Ishimaru, Masaru, additional, Isozaki, Kazunori, additional, Itagaki, Wataru, additional, Ito, Chikara, additional, Kageyam, Hiroyuki, additional, Kaito, Takeji, additional, Kameyama, Masatoshi, additional, Kamide, Hideki, additional, Kamiyama, Kenji, additional, Kato, Atsushi, additional, Kawahara, Hirotaka, additional, Kawakami, Shodai, additional, Kikuchi, Norihiro, additional, Kobayashi, Jun, additional, Kotake, Shoji, additional, Kubo, Shigenobu, additional, Kurihara, Akikazu, additional, Maeda, Shigetaka, additional, Maruyama, Shuhei, additional, Matsushita, Kentaro, additional, Michino, Masanobu, additional, Mori, Takero, additional, Morishita, Kazuki, additional, Morita, Koji, additional, Naito, Hiroyuki, additional, Ohira, Hiroaki, additional, Ohki, Shigeo, additional, Ohno, Shuji, additional, Okagaki, Masaki, additional, Okajima, Satoshi, additional, Okano, Yasushi, additional, Onishi, Takashi, additional, Onizawa, Takashi, additional, Ono, Ayako, additional, Ono, Shoji, additional, Ozawa, Takayuki, additional, Saito, Hiroto, additional, Sano, Aaru, additional, Sano, Yuichi, additional, Sasaki, Shinji, additional, Seino, Hiroshi, additional, Seki, Akiyuki, additional, Shizukawa, Yuta, additional, Takamatsu, Misao, additional, Takano, Kazuya, additional, Takata, Takashi, additional, Takaya, Shigeru, additional, Takeuchi, Masayuki, additional, Tanaka, Masaaki, additional, Taninaka, Hiroshi, additional, Tanno, Takashi, additional, Toyota, Kodai, additional, Uchibori, Akihiro, additional, Uwaba, Tomoyuki, additional, Wakai, Takashi, additional, Watakabe, Tomoyoshi, additional, Yada, Hiroki, additional, Yamamoto, Tomohiko, additional, Yamano, Hidemasa, additional, Yokoyama, Keisuke, additional, Yokoyama, Kenji, additional, Yoshida, Akihiro, additional, Yoshikawa, Ryuji, additional, and Yoshimura, Kazuo, additional

Published
2022
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30. XFEL structures of the influenza M2 proton channel: Room temperature water networks and insights into proton conduction

Author

Thomaston, Jessica L, Woldeyes, Rahel A, Nakane, Takanori, Yamashita, Ayumi, Tanaka, Tomoyuki, Koiwai, Kotaro, Brewster, Aaron S, Barad, Benjamin A, Chen, Yujie, Lemmin, Thomas, Uervirojnangkoorn, Monarin, Arima, Toshi, Kobayashi, Jun, Masuda, Tetsuya, Suzuki, Mamoru, Sugahara, Michihiro, Sauter, Nicholas K, Tanaka, Rie, Nureki, Osamu, Tono, Kensuke, Joti, Yasumasa, Nango, Eriko, Iwata, So, Yumoto, Fumiaki, Fraser, James S, and DeGrado, William F

Subjects
Chemical Sciences, Physical Chemistry, Emerging Infectious Diseases, Infectious Diseases, Influenza, Pneumonia & Influenza, Amino Acid Motifs, Hydrogen Bonding, Ion Channel Gating, Molecular Dynamics Simulation, Protein Domains, Protons, Static Electricity, Temperature, Viral Matrix Proteins, XFEL, proton channel, influenza, membrane protein
Abstract

The M2 proton channel of influenza A is a drug target that is essential for the reproduction of the flu virus. It is also a model system for the study of selective, unidirectional proton transport across a membrane. Ordered water molecules arranged in "wires" inside the channel pore have been proposed to play a role in both the conduction of protons to the four gating His37 residues and the stabilization of multiple positive charges within the channel. To visualize the solvent in the pore of the channel at room temperature while minimizing the effects of radiation damage, data were collected to a resolution of 1.4 Å using an X-ray free-electron laser (XFEL) at three different pH conditions: pH 5.5, pH 6.5, and pH 8.0. Data were collected on the Inwardopen state, which is an intermediate that accumulates at high protonation of the His37 tetrad. At pH 5.5, a continuous hydrogen-bonded network of water molecules spans the vertical length of the channel, consistent with a Grotthuss mechanism model for proton transport to the His37 tetrad. This ordered solvent at pH 5.5 could act to stabilize the positive charges that build up on the gating His37 tetrad during the proton conduction cycle. The number of ordered pore waters decreases at pH 6.5 and 8.0, where the Inwardopen state is less stable. These studies provide a graphical view of the response of water to a change in charge within a restricted channel environment.

Published
2017

34. An ytterbium quantum gas microscope with narrow-line laser cooling

Author

Yamamoto, Ryuta, Kobayashi, Jun, Kuno, Takuma, Kato, Kohei, and Takahashi, Yoshiro

Subjects
Condensed Matter - Quantum Gases, Physics - Atomic Physics
Abstract

We demonstrate site-resolved imaging of individual bosonic $^{174}\mathrm{Yb}$ atoms in a Hubbard-regime two-dimensional optical lattice with a short lattice constant of 266 nm. To suppress the heating by probe light with the $^1S_0$-$^1P_1$ transition of the wavelength $\lambda$ = 399 nm for high-resolution imaging and preserve atoms at the same lattice sites during the fluorescence imaging, we simultaneously cool atoms by additionally applying narrow-line optical molasses with the $^1S_0$-$^3P_1$ transition of the wavelength $\lambda$ = 556 nm. We achieve a low temperature of $T = 7.4(1.3)\ \mu\mathrm{K}$, corresponding to a mean oscillation quantum number along the horizontal axes of 0.22(4) during imaging process. We detect on average 200 fluorescence photons from a single atom within 400 ms exposure time, and estimate the detection fidelity of 87(2)%. The realization of a quantum gas microscope with enough fidelity for Yb atoms in a Hubbard-regime optical lattice opens up the possibilities for studying various kinds of quantum many-body systems such as Bose and Fermi gases, and their mixtures, and also long-range-interacting systems such as Rydberg states., Comment: 14 pages, 6 figures

Published
2015
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35. Health and environmental risk assessment of mercury in outdoor and indoor dust in artisanal and small-scale gold mining area in Amansie-west district in the Ashanti Region of Ghana

Author

Poku, patrick Adu, primary, Addai-Arhin, Slyvester, additional, Nimako, Collins, additional, Arrazy, Syafran, additional, Agustiani, Tia, additional, Jeong, Huiho, additional, Agusa, Tetsuro, additional, Ishibashi, Yasuhiro, additional, and Kobayashi, Jun, additional

Published
2024
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37. A Neural Network-Based DPD Coefficient Determination for PA Linearization in 5G and Beyond-5G mmWave Systems

Author

Narayanan, Aravind Tharayil, primary, Minati, Ludovico, additional, Hagihara, Aran, additional, Kobayashi, Jun, additional, Shimura, Toshihiro, additional, Kawano, Yoichi, additional, Chakraborty, Parthojit, additional, Bartels, Jim, additional, Tokgöz, Korkut Kaan, additional, Dosho, Shiro, additional, Suzuki, Toshihide, additional, and Ito, Hiroyuki, additional

Published
2024
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41. Design of Temperature-Responsive Cell Culture Surfaces for Cell Sheet-Based Regenerative Therapy and 3D Tissue Fabrication

Author

Kobayashi, Jun, Akiyama, Yoshikatsu, Yamato, Masayuki, Shimizu, Tatsuya, Okano, Teruo, COHEN, IRUN R., Series Editor, LAJTHA, ABEL, Series Editor, LAMBRIS, JOHN D., Series Editor, PAOLETTI, RODOLFO, Series Editor, Rezaei, Nima, Series Editor, Chun, Heung Jae, editor, Park, Chan Hum, editor, Kwon, Il Keun, editor, and Khang, Gilson, editor

Published
2018
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47. Contributors

Author

Abram, Quinn H., primary, Addas-Carvalho, Marcelo, additional, Alpuche-Lazcano, Sergio P., additional, Alves, Maria João, additional, Alves-Leon, Soniza Vieira, additional, Amaro, Fátima, additional, Araújo, Josélio Maria Galvão de, additional, Araujo-Pereira, Mariana, additional, Aspahan, Maíra Cardoso, additional, Barbosa, Maria Helena de M., additional, Barnard, Trisha R., additional, Beck, Cécile, additional, Benites, Bruno Deltreggia, additional, Beys-da-Silva, Walter Orlando, additional, Bloom, Marshall E., additional, Boivin, Guy, additional, Brault, Aaron C., additional, Cabral-Marques, Otavio, additional, de Caires Junior, Luiz Carlos, additional, Cardoso, Cynthia Chester, additional, Carrillo-Hernández, Marlen Yelitza, additional, Chimelli, Leila, additional, Christo, Paulo Pereira, additional, Chu, Dinh-Toi, additional, Coombs, Kevin M., additional, Costa, Fabio T.M., additional, Costa Monteiro, Lucia Maria, additional, Cristina, Juan, additional, Cunha, Marielton Dos Passos, additional, da Silva Augusto, Lia Giraldo, additional, Desprès, Philippe, additional, Diaz, Adrián, additional, Diderichsen, Finn, additional, Duarte, Alberto José da Silva, additional, Dumarest, Marine, additional, El Khawanky, Nadia, additional, Fernandes, José Veríssimo, additional, Fonseca, Simone G., additional, Fontes-Dantas, Fabrícia Lima, additional, Gadea, Gilles, additional, Gallo, Luciana Guerra, additional, Gatignol, Anne, additional, Gaytán, David Alejandro Cabrera, additional, Gonzalez, Gaelle, additional, Goulart, Ernesto, additional, Gregorio, Ernesto R., additional, Guedes, Paulo Marcos Matta, additional, Hamel, Rodolphe, additional, Hofer, Cristina Barroso, additional, Ismail, Amni Adilah, additional, Jääskeläinen, Anne J., additional, Jen, Soe Hui, additional, Judice, Carla, additional, Kaid, Carolini, additional, Kobayashi, Jun, additional, Lecollinet, Sylvie, additional, Leyser, Marcio, additional, de Magalhães-Barbosa, Maria Clara, additional, Manikam, Rishya, additional, Marques, Fernanda J.P., additional, Martínez-Gutiérrez, Marlen, additional, Martins, Felipe, additional, de Matos, António Pedro Alves, additional, McDonald, Erin M., additional, Meltzer, Eyal, additional, Mendoza, Teresita Rojas, additional, Mitsugi, Thiago, additional, Mlera, Luwanika, additional, Muñiz, Concepción Grajales, additional, Nakaya, Helder I., additional, Nascimento, Andrezza, additional, Nascimento, Gilmara Lima, additional, Nascimento, Manuela Sales Lima, additional, Nascimento, Osvaldo J.M., additional, Nguyen, Tiep Tien, additional, Nieto, Lumumba Arriaga, additional, de Oliveira, Maria Regina Fernandes, additional, Owczarek, Katarzyna, additional, Parás, Alfonso Vallejos, additional, Patel, Vinood B., additional, Peixoto, Henry Maia, additional, Pereira-Gómez, Marianoel, additional, Pfrimer, Irmtraut Araci H., additional, Phumee, Atchara, additional, Piret, Jocelyne, additional, Prata-Barbosa, Arnaldo, additional, Preedy, Victor R., additional, Pyrć, Krzysztof, additional, Rajendram, Rajkumar, additional, Raju, Chandramathi Samudi, additional, Rossi, Átila Duque, additional, Rueda-Lopes, Fernanda Cristina, additional, Ruiz-Saenz, Julian, additional, Sagan, Selena M., additional, Salmeron, Amanda Costa Ayres, additional, Sanabani, Sabri Saeed, additional, Santi, Lucélia, additional, Santos, Wilo Victor dos, additional, Schuch, Viviane, additional, Sekaran, Shamala Devi, additional, Sherwood, Matt, additional, Shrivastava, Prateek Saurabh, additional, Shrivastava, Saurabh RamBihariLal, additional, Siriyasatien, Padet, additional, Son, Nguyen Thai, additional, Tatara, Juliana Miranda, additional, Ten Caten, Felipe, additional, Tho, Ho Huu, additional, Viranaicken, Wildriss, additional, Vivacqua, Daniela Pires Ferreira, additional, Xu, Dan, additional, Xu, Zhiheng, additional, Zatz, Mayana, additional, and Zé-Zé, Libia, additional

Published
2021
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