7,563 results on '"Yoshikawa, T."'
Search Results
2. Numerical analysis on failure mechanism of unsaturated slope due to rain
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Yoshikawa, T., primary and Noda, T., additional
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- 2023
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3. Absorption Lines in the 0.91-1.33 $\mu$m Spectra of Red Giants for Measuring Abundances of Mg, Si, Ca, Ti, Cr, and Ni
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Fukue, K., Matsunaga, N., Kondo, S., Taniguchi, D., Ikeda, Y., Kobayashi, N., Sameshima, H., Hamano, S., Arai, A., Kawakita, H., Yasui, C., Mizumoto, M., Otsubo, S., Takenaka, K., Yoshikawa, T., and Tsujimoto, T.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
Red giants show a large number of absorption lines in both optical and near-infrared wavelengths. Still, the characteristics of the lines in different wave passbands are not necessarily the same. We searched for lines of Mg I, Si I, Ca I, Ti I, Cr I, and Ni I in the z', Y, and J bands (0.91-1.33 $\mu$m), that are useful for precise abundance analyses, from two different compilations of lines, namely, the third release of Vienna Atomic Line Database (VALD3) and the catalog published by Melendez & Barbuy in 1999 (MB99). We selected sufficiently strong lines that are not severely blended and ended up with 191 lines (165 and 141 lines from VALD3 and MB99, respectively), in total, for the six elements. Combining our line lists with high-resolution (R = 28,000) and high signal-to-noise (higher than 500) spectra taken with the WINERED spectrograph, we measured the abundances of the six elements in addition to Fe I of two prototype red giants, i.e., Arcturus and mu Leo. The resultant abundances show reasonable agreements with literature values within $\sim$0.2 dex, indicating that the available oscillator strengths are acceptable, although the abundances based on the two line lists show systematic differences by 0.1-0.2 dex. Furthermore, to improve the precision, solid estimation of the microturbulence (or the microturbulences if they are different for different elements) is necessary as far as the classical hydrostatic atmosphere models are used for the analysis., Comment: 26 pages, 10 figures, 6 tables (two long tables, Table 1 and 2, are entirely appended), accepted for publication in Astrophysical Journal
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- 2021
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4. Ability of Blood Cell Parameters to Predict Clinical Outcomes of Nivolumab Monotherapy in Advanced Esophageal Squamous Cell Carcinoma
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Hamai Y, Emi M, Ibuki Y, Kurokawa T, Yoshikawa T, Ohsawa M, Hirohata R, Kitasaki N, and Okada M
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biomarkers ,cancer ,esophagus ,immunotherapy ,response ,survival ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Yoichi Hamai, Manabu Emi, Yuta Ibuki, Tomoaki Kurokawa, Toru Yoshikawa, Manato Ohsawa, Ryosuke Hirohata, Nao Kitasaki, Morihito Okada Department of Surgical Oncology, Hiroshima University, Hiroshima, JapanCorrespondence: Yoichi Hamai, Department of Surgical Oncology, Hiroshima University, 1-2-3 Kasumi, Minami-Ku, Hiroshima, 734-8551, Japan, Tel +81 822575869, Fax +81 822567109, Email yyhamai@hiroshima-u.ac.jpPurpose: Various blood cell parameters have been identified as predictive markers of tumor responses and the survival of patients with cancer treated with immune checkpoint inhibitors. The purpose of this study is to assess the ability of various blood cell parameters to predict therapeutic effects and survival in patients with esophageal squamous cell carcinoma (ESCC) treated with nivolumab monotherapy.Patients and Methods: We evaluated neutrophil-to-lymphocyte (NLR), platelet-to-lymphocyte (PLR) and lymphocyte-to-monocyte (LMR) ratios as predictive markers of patients’ survival and effects of nivolumab monotherapy after one or more prior chemotherapies for unresectable advanced or recurrent ESCC.Results: The objective response and disease control rates were 20.3% and 47.5%, respectively. The LMRs before, and 14 and 28 days after nivolumab initiation were significantly higher in patients with complete response (CR)/partial response (PR)/stable disease (SD) than those with progressive disease (PD). The NLRs at 14 and 28 days after nivolumab initiation were significantly lower in patients with CR/PR/SD than with PD. The optimal cutoffs for these parameters significantly discriminated patients with CR/PR/SD and PD. Univariate and multivariate analyses identified pretreatment NLRs as a significant independent factor for progression-free and overall survival (hazard ratio [HR]: 1.19, 95% confidence interval [CI]: 1.07– 1.32, and HR 1.23, 95% CI: 1.11– 1.37, respectively; p ≤ 0.001 for both).Conclusion: The pretreatment LMRs, and NLR and LMR at 14 and 28 days after starting nivolumab monotherapy were significantly associated with the clinical therapeutic effect. The pretreatment NLR was significantly associated with patients’ survival. These blood cell parameters before and during the early days of nivolumab monotherapy can help to identify patients with ESCC who would most likely benefit from nivolumab monotherapy.Keywords: biomarkers, cancer, esophagus, immunotherapy, response, survival
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- 2023
5. AB0559 SERUM MAC-2 BINDING PROTEIN GLYCOSYLATION ISOMER LEVELS CORRELATE WITH DISEASE ACTIVITY IN PATIENTS WITH RHEUMATOID ARTHRITIS, A DISEASE ASSOCIATED WITH TYPE I INTERFERONOPATHY
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Yoshikawa, T., primary, Abe, T., additional, Tamura, M., additional, Furukawa, T., additional, Hashimoto, T., additional, Azuma, N., additional, and Matsui, K., additional
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- 2024
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6. Radial spin texture in elemental tellurium with chiral crystal structure
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Sakano, M., Hirayama, M., Takahashi, T., Akebi, S., Nakayama, M., Kuroda, K., Taguchi, K., Yoshikawa, T., Miyamoto, K., Okuda, T., Ono, K., Kumigashira, H., Ideue, T., Iwasa, Y., Mitsuishi, N., Ishizaka, K., Shin, S., Miyake, T., Murakami, S., Sasagawa, T., and Kondo, Takeshi
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Condensed Matter - Materials Science - Abstract
The chiral crystal is characterized by a lack of mirror symmetry and an inversion center, resulting in the inequivalent right- and left-handed structures. In the noncentrosymmetric crystal structure, the spin and momentum of electrons are locked in the reciprocal space with the help of the spin-orbit interaction. To reveal the spin textures of chiral crystals, here we investigate the spin and electronic structure in p-type semiconductor elemental tellurium with a chiral crystal structure by using spin- and angle-resolved photoemission spectroscopy. Our data demonstrate that the highest valence band crossing the Fermi level has a spin component parallel to the electron momentum around the BZ corners. Significantly, we have also confirmed that the spin polarization is reversed in the crystal with the opposite chirality. The results indicate that the spin textures of the right- and left-handed chiral crystals are hedgehog-like, leading to unconventional magnetoelectric effects and nonreciprocal phenomena., Comment: 15 pages, 4 figures
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- 2019
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7. WINERED high-resolution near-infrared line catalog: A-type star
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Sameshima, H., Ikeda, Y., Matsunaga, N., Fukue, K., Kobayashi, N., Kondo, S., Hamano, S., Kawakita, H., Yasui, C., Izumi, N., Mizumoto, M., Otsubo, S., Takenaka, K., Watase, A., Asano, A., and Yoshikawa, T.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We present a catalog of absorption lines in the z', Y, and J bands that we identified in 21 Lyn, a slowly rotating A0.5 V star. We detected 155 absorption features in the high-resolution (0.90-1.35 um, R = 28,000) spectrum obtained with the WINERED spectrograph after the telluric absorption was carefully removed using a spectrum of a B-type star as a telluric standard. With a visual comparison with synthetic spectra, we compiled a catalog of 219 atomic lines for the 155 features, some of which are composed of multiple fine structure lines. The high-quality WINERED spectrum enabled us to detect a large number of weak lines down to ~1% in depth, which are identified for an A-type star for the first time. The catalog includes the lines of H, C, N, O, Mg, Al, Si, S, Ca, Fe, and Sr. These new lines are expected to be useful for spectral classification and chemical abundance analyses, whilst the line list is useful for observers who plan to use A-type stars as telluric standards because it is necessary to distinguish between stellar lines and telluric absorption lines in high-resolution spectra. ASCII versions of the spectra are available in the online version of the journal., Comment: 22 pages, 6 figures, 5 tables, accepted for publication in ApJS
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- 2018
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8. On the chemical abundances of Miras in clusters: V1 in the metal-rich globular NGC 5927
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D'Orazi, V., Magurno, D., Bono, G., Matsunaga, N., Braga, V. F., Elgueta, S. S., Fukue, K., Hamano, S., Inno, L., Kobayashi, N., Kondo, S., Monelli, M., Nonino, M., Przybilla, P. N., Sameshima, H., Saviane, I., Taniguchi, D., Thevenin, F., Urbaneja-Perez, M., Watase, A., Arai, A., Bergemann, M., Buonanno, R., Dall'Ora, M., Silva, R., Fabrizio, M., Ferraro, I., Fiorentino, G., Francois, P., Gilmozzi, R., Iannicola, G., Ikeda, Y., Jian, M., Kawakita, H., Kudritzki, R. -P., Lemasle, B., Marengo, M., Marinoni, S., Martinez-Vasquez, C., Minniti, D., Neeley, J., Otsubo, S., Prieto, J. L., Proxauf, B., Romaniello, M., Sanna, N., Sneden, C., Takenaka, K., Tsujimoto, T., Valenti, E., Yasui, C., Yoshikawa, T., and Zoccali, M.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We present the first spectroscopic abundance determination of iron, alpha-elements (Si, Ca and Ti) and sodium for the Mira variable V1 in the metal-rich globular cluster NGC 5927. We use high-resolution (R~ 28,000), high signal-to-noise ratio (~200) spectra collected with WINERED, a near-infrared (NIR) spectrograph covering simultaneously the wavelength range 0.91--1.35 micron. The effective temperature and the surface gravity at the pulsation phase of the spectroscopic observation were estimated using both optical (V) and NIR time-series photometric data. We found that the Mira is metal-rich ([Fe/H]=-0.55 \pm 0.15) and moderately alpha-enhanced ([alpha/Fe]=0.15 \pm 0.01, sigma=0.2). These values agree quite well with the mean cluster abundances based on high-resolution optical spectra of several cluster red giants available in the literature ([Fe/H]=-0.47 \pm 0.06, [alpha/Fe]=+0.24 \pm 0.05). We also found a Na abundance of +0.35 \pm 0.20 that is higher than the mean cluster abundance based on optical spectra (+0.18 \pm 0.13). However, the lack of similar spectra for cluster red giants and that of corrections for departures from local-thermodynamical equilibrium prevents us from establishing whether the difference is intrinsic or connected with multiple populations. These findings indicate a strong similarity between optical and NIR metallicity scales in spite of the difference in the experimental equipment, data analysis and in the adopted spectroscopic diagnostics., Comment: Accepted for publication in the Astrophysical Journal Letters, 9 pages, 3 figures
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- 2018
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9. Experimental realization of type-II Weyl state in non-centrosymmetric TaIrTe$_4$
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Haubold, E., Koepernik, K., Efremov, D., Khim, S., Fedorov, A., Kushnirenko, Y., Brink, J. van den, Wurmehl, S., Buchner, B., Kim, T. K., Hoesch, M., Sumida, K., Taguchi, K., Yoshikawa, T., Kimura, A., Okuda, T., and Borisenko, S. V.
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Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Materials Science - Abstract
Recent breakthrough in search for the analogs of fundamental particles in condensed matter systems lead to experimental realizations of 3D Dirac and Weyl semimetals. Weyl state can be hosted either by non-centrosymmetric or magnetic materials and can be of the first or the second type. Several non-centrosymmetric materials have been proposed to be type-II Weyl semimetals, but in all of them the Fermi arcs between projections of multiple Weyl points either have not been observed directly or they were hardly distinguishable from the trivial surface states which significantly hinders the practical application of these materials. Here we present experimental evidence for type-II non-centrosymmetric Weyl state in TaIrTe$_4$ where it has been predicted theoretically. We find direct correspondence between ARPES spectra and calculated electronic structure both in the bulk and the surface and clearly observe the exotic surface states which support the quasi-1D Fermi arcs connecting only four Weyl points. Remarkably, these electronic states are spin-polarized in the direction along the arcs, thus highlighting TaIrTe$_4$ as a novel material with promising application potential., Comment: 9 pages, 4 figures
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- 2016
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10. Lymph node dissection for gastric cancer: Establishment of D2 and the current position of splenectomy in Europe and Japan
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Faiz, Z., Hayashi, T., and Yoshikawa, T.
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- 2021
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11. Star formation activity in Balmer break galaxies at $z$ < 1.5
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Tello, J. Díaz, Donzelli, C., Padilla, N., Akiyama, M., Fujishiro, N., Yoshikawa, T., and Hanami, H.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Aims. We present a spectroscopic study of the properties of 64 Balmer break galaxies that show signs of star formation. The studied sample of star-forming galaxies spans a redshift range from 0.094 to 1.475 with stellar masses in the range 10$^{8}-$10$^{12}$ $M_{\odot}$. The sample also includes eight broad emission line galaxies with redshifts between 1.5 $
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- 2016
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12. Relationship Between Helicobacter pylori Infection and Arteriosclerosis
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Furuto Y, Kawamura M, Yamashita J, Yoshikawa T, Namikawa A, Isshiki R, Takahashi H, and Shibuya Y
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helicobacter pylori infection ,arteriosclerosis ,hypertension ,Medicine (General) ,R5-920 - Abstract
Yoshitaka Furuto, Mariko Kawamura, Jumpei Yamashita, Takahiro Yoshikawa, Akio Namikawa, Rei Isshiki, Hiroko Takahashi, Yuko Shibuya Department of Hypertension and Nephrology, NTT Medical Centre, Tokyo, JapanCorrespondence: Yoshitaka FurutoDepartment of Hypertension and Nephrology, NTT Medical Centre, 5-9-22, Higasi-Gotanda, Shinagawa-Ku, Tokyo, 141-8625, JapanTel +81 03-3448-6111Fax +81 03-3448-6058Email furuto19761006@yahoo.co.jpAbstract: It is reported that Helicobacter pylori (H. pylori) infection may be linked to non-digestive tract diseases, such as arteriosclerosis including dyslipidemia, diabetes, obesity, hypertension, and cardiovascular disease. Therefore, we reviewed recent studies available in PubMed dealing with the mechanisms of arteriosclerosis due to H. pylori infection and the effects of H. pylori eradication. Conventional studies suggested that H. pylori infection may increase the risk of arteriosclerosis. A large interventional study is required to clarify the causal relationships and the effects of bacterial eradication.Keywords: Helicobacter pylori infection, arteriosclerosis, hypertension
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- 2021
13. Comparison of Cerebral Blood Flow Patterns in Patients with Phantom Bite Syndrome with Their Corresponding Clinical Features
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Umezaki Y, Watanabe M, Shinohara Y, Sugawara S, Kawasaki K, Tu TTH, Watanabe T, Suga T, Miura A, Takenoshita M, Sato Y, Minami I, Oyama J, Toriihara A, Yoshikawa T, Naito T, Motomura H, and Toyofuku A
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phantom bite syndrome ,cerebral blood flow ,single photon emission computed tomography ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Yojiro Umezaki,1 Motoko Watanabe,2 Yukiko Shinohara,2 Shiori Sugawara,2 Kaoru Kawasaki,2 Trang TH Tu,2 Takeshi Watanabe,2 Takayuki Suga,2 Anna Miura,2 Miho Takenoshita,2 Yusuke Sato,3 Ichiro Minami,4 Jun Oyama,5 Akira Toriihara,5 Tatsuya Yoshikawa,2 Toru Naito,1 Haruhiko Motomura,2 Akira Toyofuku2 1Section of Geriatric Dentistry, Department of General Dentistry, Fukuoka Dental College, Fukuoka 814-0193, Japan; 2Department of Psychosomatic Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8548, Japan; 3Department of Gerontology and Gerodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8548, Japan; 4Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8548, Japan; 5Department of Diagnostic Radiology and Nuclear Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8548, JapanCorrespondence: Akira ToyofukuDepartment of Psychosomatic Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8548, JapanTel/Fax +81- 3-5803-5909Email toyoompm@tmd.ac.jpBackground: Phantom bite syndrome (PBS) is characterized by an uncomfortable sensation during occlusion without any evident abnormality. A recent case–control study with single-photon emission computed tomography (SPECT) using 99mTc-ethyl cysteinate dimer could not find the specific features of regional cerebral blood flow (rCBF), which might be due to the heterogeneity of PBS. We analyzed the brain images of PBS corresponding to the clinical features by studying PBS subgroups.Methods: This study contributes to elucidating the pathophysiology of PBS by evaluating regional brain perfusion on SPECT and its clinical features. We performed SPECT using 99mTc-ethyl cysteinate dimer in 44 patients with PBS. The SPECT images were analyzed qualitatively and quantitatively.Results: Asymmetrical rCBF patterns were detected, corresponding to symptom laterality. Patients with PBS with right-side symptoms showed right-side-predominant rCBF asymmetry in the parietal region and left-side-predominant rCBF asymmetry in the thalamus, and vice versa. Moreover, the analysis of the association between rCBF and patient behaviors revealed that patients who blamed their dentists for their symptoms tended to have a symmetrical rCBF pattern.Conclusion: Patients with PBS showed blood flow imbalance in the thalamus and parietal region corresponding to symptom laterality. There are two types of symmetrical and asymmetrical rCBF patterns in the pathophysiology of PBS despite similar clinical manifestations.Keywords: phantom bite syndrome, cerebral blood flow, single-photon emission computed tomography
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- 2020
14. Mucin expression in gastric- and gastro-oesophageal signet-ring cell cancer: results from a comprehensive literature review and a large cohort study of Caucasian and Asian gastric cancer
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Kerckhoffs, K. G. P., Liu, D. H. W., Saragoni, L., van der Post, R. S., Langer, R., Bencivenga, M., Iglesias, M., Gallo, G., Hewitt, L. C., Fazzi, G. E., Vos, A. M., Renaud, F., Yoshikawa, T., Oshima, T., Tomezzoli, A., de Manzoni, G., Arai, T., Kushima, R., Carneiro, F., and Grabsch, H. I.
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- 2020
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15. Therapeutic Dose of Amitriptyline for Older Patients with Burning Mouth Syndrome
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Suga T, Takenoshita M, Watanabe T, Tu TTH, Mikuzuki L, Hong C, Miura K, Yoshikawa T, Nagamine T, and Toyofuku A
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amitriptyline ,burning mouth syndrome ,aged ,chronic pain ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Takayuki Suga,1 Miho Takenoshita,1 Takeshi Watanabe,1 Trang TH Tu,1 Lou Mikuzuki,1 Chaoli Hong,1 Kazuhito Miura,2 Tatsuya Yoshikawa,1 Takahiko Nagamine,3 Akira Toyofuku1 1Department of Psychosomatic Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; 2Department of Gerodontology, Division of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University, Hokkaido, Japan; 3Department of Psychiatric Internal Medicine, Sunlight Brain Research Center, Yamaguchi, JapanCorrespondence: Akira ToyofukuDepartment of Psychosomatic Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8510, JapanTel/Fax +81 3 5803 5898Email toyoompm@tmd.ac.jpObjective: To assess the therapeutic dose and safety of amitriptyline and the outcome following treatment with amitriptyline among older patients with burning mouth syndrome (BMS).Methods: 187 consecutive patients were prescribed amitriptyline as a first-line medication from April 2016 to September 2018 and followed-up for >1 month. Patients were divided into 3 groups: group 1, 113 patients aged
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- 2019
16. Physical Properties, Star Formation, and Active Galactic Nucleus Activity in Balmer Break Galaxies at 0 < z < 1
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Tello, J. Díaz, Donzelli, C., Padilla, N., Fujishiro, N., Hanami, H., Yoshikawa, T., and Hatsukade, 'and' B.
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Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We present a spectroscopic study with the derivation of the physical properties of 37 Balmer break galaxies, which have the necessary lines to locate them in star-forming-AGN diagnostic diagrams. These galaxies span a redshift range from 0.045 to 0.93 and are somewhat less massive than similar samples of previous works. The studied sample has multiwavelength photometric data coverage from the ultraviolet to MIR Spitzer bands. We investigate the connection between star formation and AGN activity via optical, mass-excitation (MEx) and MIR diagnostic diagrams. Through optical diagrams, 31 (84%) star-forming galaxies, 2 (5%) composite galaxies and 3 (8%) AGNs were classified, whereas from the MEx diagram only one galaxy was classified as AGN. A total of 19 galaxies have photometry available in all the IRAC/Spitzer bands. Of these, 3 AGN candidates were not classified as AGN in the optical diagrams, suggesting they are dusty/obscured AGNs, or that nuclear star formation has diluted their contributions. Furthermore, the relationship between SFR surface density (\Sigma_{SFR}) and stellar mass surface density per time unit (\Sigma_{M_{\ast}/\tau}) as a function of redshift was investigated using the [OII] \lambda3727, 3729, H\alpha \lambda6563 luminosities, which revealed that both quantities are larger for higher redshift galaxies. We also studied the SFR and SSFR versus stellar mass and color relations, with the more massive galaxies having higher SFR values but lower SSFR values than less massive galaxies. These results are consistent with previous ones showing that, at a given mass, high-redshift galaxies have on average larger SFR and SSFR values than low-redshift galaxies. Finally, bluer galaxies have larger SSFR values than redder galaxies and for a given color the SSFR is larger for higher redshift galaxies., Comment: preprint version, 36 pages, 17 figures, 3 tables, accepted for publication in the Astrophysical Journal
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- 2013
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17. Ionization Source of a Minor-axis Cloud in the Outer Halo of M82
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Matsubayashi, K., Sugai, H., Shimono, A., Hattori, T., Ozaki, S., Yoshikawa, T., Taniguchi, Y., Nagao, T., Kajisawa, M., Shioya, Y., and Bland-Hawthorn, J.
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Astrophysics - Galaxy Astrophysics - Abstract
The M82 `cap' is a gas cloud at a projected radius of 11.6 kpc along the minor axis of this well known superwind source. The cap has been detected in optical line emission and X-ray emission and therefore provides an important probe of the wind energetics. In order to investigate the ionization source of the cap, we observed it with the Kyoto3DII Fabry-Perot instrument mounted on the Subaru Telescope. Deep continuum, Ha, [NII]6583/Ha, and [SII]6716,6731/Ha maps were obtained with sub-arcsecond resolution. The superior spatial resolution compared to earlier studies reveals a number of bright Ha emitting clouds within the cap. The emission line widths (< 100 km s^-1 FWHM) and line ratios in the newly identified knots are most reasonably explained by slow to moderate shocks velocities (v_shock = 40--80 km s^-1) driven by a fast wind into dense clouds. The momentum input from the M82 nuclear starburst region is enough to produce the observed shock. Consequently, earlier claims of photoionization by the central starburst are ruled out because they cannot explain the observed fluxes of the densest knots unless the UV escape fraction is very high (f_esc > 60%), i.e., an order of magnitude higher than observed in dwarf galaxies to date. Using these results, we discuss the evolutionary history of the M82 superwind. Future UV/X-ray surveys are expected to confirm that the temperature of the gas is consistent with our moderate shock model., Comment: 7 pages, 5 figures, 2 tables; Accepted for publication in ApJ
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- 2012
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18. MOIRCS Deep Survey. VIII. Evolution of Star Formation Activity as a Function of Stellar Mass in Galaxies since z~3
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Kajisawa, M., Ichikawa, T., Yamada, T., Uchimoto, Y. K., Yoshikawa, T., Akiyama, M., and Onodera, M.
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Astrophysics - Cosmology and Extragalactic Astrophysics - Abstract
We study the evolution of star formation activity of galaxies at 0.5
~1. We found galaxies at 2.5 1 and becomes significant at z~3, especially in the case with the SFR based on MIPS 24um. In galaxies with Mstar = 10^{10-11.5} Msun, those with a relatively narrow range of SSFR (<~1 dex) dominates the cosmic SFRD at 0.5 - Published
- 2010
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19. Physics at Super B Factory
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Aushev, T., Bartel, W., Bondar, A., Brodzicka, J., Browder, T. E., Chang, P., Chao, Y., Chen, K. F., Dalseno, J., Drutskoy, A., Enari, Y., Gershon, T., Golob, B., Goto, T., Handa, F., Hara, K., Hashimoto, S., Hayashii, H., Hazumi, M., Higuchi, T., Hisano, J., Hou, W. S., Iijima, T., Ikado, K., Inami, K., Itoh, H., Itoh, R., Ishino, H., Katayama, N., Keum, Y. Y., Kinoshita, K., Kou, E., Križan, P., Krokovny, P., Kurimoto, T., Kwon, Y., Limosani, A., Matsumoto, T., Morozumi, T., Nakahama, Y., Nakao, M., Nishida, S., Ohshima, T., Okada, Y., Okumura, K., Olsen, S. L., Onogi, T., Pakhlova, G., Palka, H., Pakhlov, P., Poluektov, A., Recksiegel, S., Sagawa, H., Saigo, M., Sakai, Y., Sanda, A. I., Schwanda, C., Schwartz, A., Senyo, K., Shimizu, Y., Shindou, T., Sinha, R., Starič, M., Sumisawa, K., Tanaka, M., Trabelsi, K., Urquijo, P., Ushiroda, Y., Won, E., Yamamoto, H., Yamauchi, M., Yoshikawa, T., and Zupan, J.
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High Energy Physics - Experiment - Abstract
This report presents the results of studies that investigate the physics reach at a Super $B$ factory, an asymmetric-energy $e^+e^-$ collider with a design luminosity of $8 \times 10^{35}$ cm$^{-2}$s$^{-1}$, which is around 50 times as large as the peak luminosity achieved by the KEKB collider. The studies focus on flavor physics and CP violation measurements that could be carried out in the LHC era. The physics motivation, key observables, measurement methods and expected precisions are presented.
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- 2010
20. Unveiling the Nature of Submillimeter Galaxy SXDF850.6
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Hatsukade, B., Iono, D., Yoshikawa, T., Akiyama, M., Dunlop, J. S., Ivison, R. J., Peck, A. B., Ikarashi, S., Biggs, A., Ezawa, H., Hanami, H., Ho, P., Hughes, D. H., Kawabe, R., Kohno, K., Matsushita, S., Nakanishi, K., Padilla, N., Petitpas, G., Tamura, Y., Wagg, J., Wilner, D. J., Wilson, G. W., Yamada, T., and Yun, M. S.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present an 880 micron Submillimeter Array (SMA) detection of the submillimeter galaxy SXDF850.6. SXDF850.6 is a bright source (S(850 micron) = 8 mJy) detected in the SCUBA Half Degree Extragalactic Survey (SHADES), and has multiple possible radio counterparts in its deep radio image obtained at the VLA. Our new SMA detection finds that the submm emission coincides with the brightest radio emission that is found ~8" north of the coordinates determined from SCUBA. Despite the lack of detectable counterparts in deep UV/optical images, we find a source at the SMA position in near-infrared and longer wavelength images. We perform SED model fits to UV-optical-IR photometry (u, B, V, R, i', z', J, H, K, 3.6 micron, 4.5 micron, 5.8 micron, and 8.0 micron) and to submm-radio photometry (850 micron, 880 micron, 1100 micron, and 21 cm) independently, and we find both are well described by starburst templates at a redshift of z ~= 2.2 (+/- 0.3). The best-fit parameters from the UV-optical-IR SED fit are a redshift of z = 1.87 (+0.15/-0.07), a stellar mass of M_star = 2.5 +2.2/-0.3 x 10^11 M_sun, an extinction of A_V = 3.0 (+0.3/-1.0) mag, and an age of 720 (+1880/-210) Myr. The submm-radio SED fit provides a consistent redshift of z ~ 1.8-2.5, an IR luminosity of L_IR = (7-26) x 10^12 L_sun, and a star formation rate of 1300-4500 M_sun/yr. These results suggest that SXDF850.6 is a mature system already having a massive amount of old stellar population constructed before its submm bright phase and is experiencing a dusty starburst, possibly induced by major mergers., Comment: 7 pages, 5 figures, Accepted for publication in Astrophysical Journal
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- 2010
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21. MOIRCS Deep Survey IV: Evolution of Galaxy Stellar Mass Function Back to z ~ 3
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Kajisawa, M., Ichikawa, T., Tanaka, I., Konishi, M., Yamada, T., Akiyama, M., Suzuki, R., Tokoku, C., Uchimoto, Y. K., Yoshikawa, T., Ouchi, M., Iwata, I., Hamana, T., and Onodera, M.
- Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics - Abstract
We use very deep near-infrared (NIR) imaging data obtained in MOIRCS Deep Survey (MODS) to investigate the evolution of the galaxy stellar mass function back to z~3. The MODS data reach J=24.2, H=23.1, K=23.1 (5sigma, Vega magnitude) over 103 arcmin^2 (wide) and J=25.1, H=23.7, K=24.1 over 28 arcmin^2 (deep) in the GOODS-North region. The wide and very deep NIR data allow us to measure the number density of galaxies down to low stellar mass (10^9-10^10 Msun) even at high redshift with high statistical accuracy. The normalization of the mass function decreases with redshift and the integrated stellar mass density becomes ~ 8-18% of the local value at z~2 and ~ 4-9% at z~3, which are consistent with results of previous studies in general fields. Furthermore, we found that the low-mass slope becomes steeper with redshift from alpha ~- 1.3 at z~1 to alpha ~- 1.6 at z~3, and that the evolution of the number density of low-mass (10^9-10^10 Msun) galaxies is weaker than that of M* (~10^11 Msun) galaxies. This indicates that the contribution of low-mass galaxies to the total stellar mass density has been significant at high redshift. The steepening of the low-mass slope with redshift is opposite trend expected from the stellar mass dependence of the specific star formation rate reported in previous studies. The present result suggests that the hierarchical merging process overwhelmed the effect of the stellar mass growth by star formation and was very important for the stellar mass assembly of these galaxies at 1<~z<~3., Comment: 21 pages, 18 figures, accepted for publication in ApJ
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- 2009
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22. MOIRCS Deep Survey III: Active Galactic Nuclei in Massive Galaxies at z=2-4
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Yamada, T., Kajisawa, M., Akiyama, M., Ichikawa, T., Konishi, M., Nishimura, T., Omata, K., Suzuki, R., Tanaka, I., Tokoku, C., Uchimoto, Y. K., and Yoshikawa, T.
- Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics - Abstract
We investigate the X-ray properties of the K-band-selected galaxies at redshift 2 < z < 4 by using our deep near-infrared images obtained in the MOIRCS Deep Survey project and the published Chandra X-ray source catalog. 61 X-ray sources with the 2-10 keV luminosity L_X = 10^{42}-10^{44} erg/s are identified with the K-selected galaxies and we found that they are exclusively (90%) associated with the massive objects with stellar mass larger than 10^{10.5} Msun. Our results are consistent with the idea that the M_BH/M_str ratio of the galaxies at z=2-4 is similar to the present-day value. On the other hand, the AGN detection rate among the very massive galaxies with the stellar mass larger than 10^{11} Msun is high, 33% (26/78). They are active objects in the sense that the black-hole mass accretion rate is ~ 1-50% of the Eddington limit if they indeed have similar M_BH/M_str ratio with those observed in the local universe. The active duration in the AGN duty cycle of the high-redshift massive galaxies seems large., Comment: 33 pages, 12 figures, accepted for publication in ApJ
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- 2009
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23. Neutralino Dark Matter in minimal supersymmetric standard model with natural light Higgs sector
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Kim, S. -G., Maekawa, N., Nagao, K. I., Sakurai, K., and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
We study the neutralino relic density in the minimal supersymmetric standard model with natural light Higgs sector in which all Higgs masses, the supersymmetry (SUSY) breaking parameters, and the higgsino mass parameter mu are of order the weak scale. To realize this situation we adopt nonuniversal Higgs masses at the grand unified scale. We show that in some parameter space in which the SUSY breaking parameters are comparatively small, not only the constraint from the observed relic density of dark matter but also the LEP Higgs bound and the constraint from the b ->s gamma process are satisfied. In most of the parameter space, the neutralino relic density becomes smaller than the observed relic density in contrast with the results in the constrained minimal SUSY standard model (CMSSM). The reason is that the neutralino coannihilation processes to Higgs bosons open even if the gaugino mass is small and the cross sections become large due to the small dimensionful parameters. Especially small mu parameter and the light CP-odd Higgs, which are difficult to be realized in the CMSSM, are essential for the result., Comment: 12 pages, 8 figures
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- 2008
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24. CP asymmetries of B to phi K_S and B to eta' K_S in SUSY GUT Model with Non-universal Sfermion Masses
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Kim, S. -G., Maekawa, N., Matsuzaki, A., Sakurai, K., and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
We analyze CP asymmetries of B \to \phi K_S and B \to \eta' K_S in a supersymmetric grand unified theory in which only the third generation sfermions contained in 10(Q, U^c, E^c) of SU(5) can have a different mass from the others. One of the advantages of this nonuniversal mass model is that the first two generation sfermion masses can be large whereas both (left and right handed) stops are light so as to stabilize the weak scale. Therefore, we studied a minimal supersymmetric standard model parameter region in which a fine tuning in Higgs sector is relaxed owing to light masses of stops, gluino and higgsinos. In such a parameter region, the chargino contribution is as important as the gluino one. We show that the CP asymmetries of B \to \phi K_S and B \to \eta' K_S can deviate from their standard model predicted values by O(0.1) because of constructive interference between gluino and chargino contributions., Comment: 22 pages, 5 figures
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- 2008
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25. Landform Development by Tectonics and Denudation
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Yoshikawa, T., primary
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- 2020
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26. New Measurements Using External Photon Conversion at a High Luminosity B Factory
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Ishino, H., Hazumi, M., Nakao, M., and Yoshikawa, T.
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High Energy Physics - Experiment ,High Energy Physics - Phenomenology - Abstract
We propose two novel methods for testing the standard model using external photon conversion at a high-luminosity e^+e^- B factory proposed recently. The first method is to measure the mixing-induced CP-violation parameter S_{pi^0pi^0} in B^0 --> pi^0 pi^0 decays. The precision of S_{pi^0pi^0} is estimated to be 0.23 from a Monte Carlo study for a data sample containing 50 x 10^9 BBbar pairs. We demonstrate that this measurement is crucial for reducing the discrete ambiguity of the Cabibbo-Kobayashi-Maskawa angle phi_2 determined from the isospin analysis with B --> pi pi decays. The second method is to measure photon polarization in B^0 --> K^{*0}(--> K^+ pi^-) gamma decays using the external photon conversion, and combine it with S_{K^{*}gamma} from B^0 --> K^{*0}(--> K^0_S pi^0) gamma decays. This offers a promising way of determining the hypothetical right-handed current amplitude and phase beyond the standard model., Comment: 4 pages, 2 figures
- Published
- 2007
27. Lepton Flavor Violation in SUSY GUT Model with Non-universal Sfermion Masses
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Kim, S. -G., Maekawa, N., Matsuzaki, A., Sakurai, K., and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
We analyze lepton flavor violating $\tau \to \mu \gamma$ and $\mu \to e \gamma$ processes in SUSY GUT model in which sfermions have special mass spectrum. It is assumed that only third generation sfermions which are contained in ${\bf 10}(Q, U^c, E^c)$ of SU(5) can have a different mass from the others. This mass spectrum is led from $E_6$ GUT model with horizontal symmetries. It is shown that branching ratios of $\tau \to \mu \gamma$ and $\mu \to e \gamma$ depend strongly on a right-handed stau mass. The weak scale stability requires the light stau, so large decay rates can be expected in this scenario. When stau is around 150 GeV and $\tan \beta \sim 10$, the branching ratios can be larger than $Br(\tau \to \mu \gamma) \simeq 10^{-8}$ and $Br(\mu \to e \gamma) \simeq 5\times 10^{-12}$, which are within reach of future experiments. In addition, this model has an interesting feature that the final state charged lepton tends to have the right-handed chirality., Comment: 17 pages, 12 figures, v3 a reference added
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- 2006
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28. A Solution for Little Hierarchy Problem and b --> s gamma
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Kim, S. -G., Maekawa, N., Matsuzaki, A., Sakurai, K., Sanda, A. I., and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
We show that all the parameters which destabilize the weak scale can be taken around the weak scale in the MSSM without conflicting with the SM Higgs mass bound set by LEP experiment. The essential point is that if the lightest CP-even Higgs h in the MSSM has only a small coupling to Z boson, g_{ZZh}, LEP cannot generate the Higgs sufficiently. In the scenario, the SM Higgs mass bound constrains the mass of the heaviest CP-even Higgs H which has the SM like g_{ZZH} coupling. However, it is easier to make the heaviest Higgs heavy by the effect of off-diagonal elements of the mass matrix of the CP-even Higgs because the larger eigenvalue of 2 times 2 matrix becomes larger by introducing off-diagonal elements. Thus, the smaller stop masses can be consistent with the LEP constraints. Moreover, the two excesses observed at LEP Higgs search can naturally be explained as the signals of the MSSM Higgs h and H in this scenario. One of the most interesting results in the scenario is that all the Higgs in the MSSM have the weak scale masses. For example, the charged Higgs mass should be around 130 GeV. This looks inconsistent with the lower bound obtained by the b --> s gamma process as m_{H^\pm}>350GeV. However, we show that the amplitude induced by the charged Higgs can naturally be compensated by that of the chargino if we take the mass parameters by which the little hierarchy problem can be solved. The point is that the both amplitudes have the same order of magnitudes when all the fields in the both loops have the same order of masses., Comment: 14 pages, 5 figures, input parameter slightly changed, figures replaced, references corrected
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- 2006
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29. Systematic Investigation of Possibilities for New Physics Effects in b --> s Penguin Processes
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Kim, C. S., Kwon, Y. J., Lee, Jake, and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
Although recent experimental results in b-->s penguin process seem to be roughly consistent with the standard model predictions, there may be still large possibilities of new physics hiding in this processes. Therefore, here we investigate systematically the potential new physics effects that may appear in time-dependent CP asymmetries of B --> phi K^0, B--> eta^\prime K^0 and B--> K^0 \pi^0 decay modes, by classifying the cases for the values of the mixing-induced indirect CP asymmetries, S_{phi K^0}, S_{eta^\prime K^0}, S_{K^0 pi^0} which are compared to S_{J/psi K^0}. We also show that several B_s decay modes may help to resolve the ambiguities in such an analysis. Through combining analysis with the time-dependent CP asymmetries of B_s decay modes such as B_s --> phi eta^\prime, B_s--> eta^\prime pi^0 and B_s --> K^0 bar{K}^0, we can determine where the new CP phases precisely come from., Comment: 17 pages, version to be published in Prog.Theor.Phys
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- 2005
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30. Search for New Physics in B Decays
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Sanda, A. I. and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
We review recent important progresses at the B factories and discuss the future prospects. We also comment on how we might proceed to search for new physics., Comment: 8 pages, 4 figures, Talk presented by A.I. Sanda at Flavor Physics and CP Violation (FPCP2004), Daegu, Korea, 4-9 Oct 2004
- Published
- 2005
31. Epstein-Barr virus and mismatch repair deficiency status differ between oesophageal and gastric cancer: A large multi-centre study
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Hewitt, L.C., Inam, I.Z., Saito, Y., Yoshikawa, T., Quaas, A., Hoelscher, A., Bollschweiler, E., Fazzi, G.E., Melotte, V., Langley, R.E., Nankivell, M., Cunningham, D., Allum, W., Hutchins, G.G., and Grabsch, H.I.
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- 2018
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32. B-> X_sl^+l^- and B->K\pi decays in vectorlike quark model
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Morozumi, T., Xiong, Z., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
In the framework of SU(2) singlet down type vectorlike quark model, we present a comprehensive analysis for decays B-> X_s \gamma, B->X_sl^+l^- and B-> K\pi. As for B-> X_s\gamma, we include the QCD running from the mass of the down-type vector quark D to weak scale in the scenario with the D quark much heavier than weak scale, and find that the running effect is small. Using the recent measurements of B-> X_sl^+l^-, we extract rather stringent constraints on the size and CP violating phase of z_{sb}, i.e., the tree level FCNC coupling for b-> sZ. Within the bounds, we investigate various observables such as forward-backward asymmetry of b->s l^+ l^-, the decay rates of B ->X_s\gamma, and B\to K\pi. We find that (1) The forward-backward asymmetry may have large derivation from that of the SM and is very sensitive to z_{sb}, and thus can be useful in probing the new physics.(2) By taking experimental errors at 2\sigma level, both experimental measurements for B->X_sl^+l^- and B->K\pi decays can be explained in this model., Comment: 23 pages, 15 figures, revtex
- Published
- 2004
33. Sufficiently Small $\bar{\theta}$ in $SU(3)^3 \times S_3$ Unification Model
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Chalut, K., Cheng, H., Frampton, P. H., Stowe, K., and Yoshikawa, T.
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High Energy Physics - Phenomenology - Abstract
Since CP violation in weak decays is successfully described by the KM mechanism, the strong CP problem cannot easily be accommodated. This leads us to reconsider the issue. If the axion and massless up quark are abandoned, we must extend the standard model. Extension to $SU(3)^3 \times S_3$ unification leads to the following situation: {\it if} CP is a high-energy symmetry and the appropriate symmetry-breaking hierarchy of scales is in place, then the $\bar{\theta}$ parameter of the QCD sub-theory is guaranteed to be sufficiently small. We find $\bar{\theta} < 10^{-11}$ while the empirical limit from the neutron electric dipole moment requires only that $\bar{\theta} < 1.3 \times 10^{-10}$., Comment: 14 pages LaTeX including 10 figures. Typo corrected
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- 2002
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34. Measurement of the Width Difference of B_d Mesons
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Dighe, A. S., Hurth, T., Kim, C. S., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
We estimate \Delta Gamma_d/\Gamma_d, including 1/m_b contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We show the methods to measure \Delta Gamma_d/\Gamma_d by using at least two different final states on the untagged B_d decay. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the B_d-\bar{B}_d mixing phase. With the high statistics and accurate time resolution of the upcoming LHC experiment, the measurement of \Delta Gamma_d seems to be possible. This measurement would be important for an accurate measurement of \sin2\phi_1 at the LHC. We also derive an upper bound on the value of \Delta Gamma_d/\Gamma_d in the presence of new physics., Comment: 3 pages, LaTeX, Presented at the 5th KEK Topical Conference(KEKTC5)
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- 2002
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35. Longitudinal polarization asymmetry of leptons in the pure leptonic B decays
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Handoko, L. T., Kim, C. S., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
Longitudinal lepton polarization asymmetry in B_q -> l l (q = d, s$ and l = e, mu, tau) decays is investigated. The analysis is done in a general manner by using the effective operators approach. It is shown that the longitudinal lepton polarization asymmetry would provide a direct search for the scalar and pseudoscalar type interactions, which are induced in all variants of Higgs-doublet models., Comment: 7 pages
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- 2001
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36. Measurement of the Lifetime Difference of $B_d$ Mesons: Possible and Worthwhile?
- Author
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Dighe, A. S., Hurth, T., Kim, C. S., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We estimate the decay width difference $\Delta Gamma_d / \Gamma_d$ in the $B_d$ system including $1/m_b$ contributions and next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged $B_d$ decaying to a single final state isotropically can only be sensitive to quadratic terms in $\Delta Gamma_d / \Gamma_d$, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a $\Delta Gamma_d / \Gamma_d$ measurement through them. The measurement of this width difference is essential for an accurate measurement of $\sin(2\beta)$ at the LHC. The nonzero width difference may also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the $B_d$-$\bar{B}_d$ mixing phase. We also derive an upper bound on the value of $\Delta Gamma_d / \Gamma_d$ in the presence of new physics, and point out some differences in the phenomenology of width differences in the $B_s$ and $B_d$ systems., Comment: latex, 31 pages, revised version
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- 2001
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37. The Effects of Non-Local Interactions in Rare B Decays, B -> X_s l^+l^-
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Fukae, S., Kim, C. S., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
The effects of non-local interactions in rare B decays, $\Bsll$, are investigated. We show the correlation between the branching ratio and the forward-backward asymmetry via two coefficients of the non-local interactions. This will certainly help us find any deviations from the standard model through the non-local interactions., Comment: 16 pages, 5 figures, LaTeX, Accepted for IJMPA
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- 2000
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38. A Systematic Analysis of the Lepton Polarization Asymmetries in the Rare B Decay, B -> X_s\tau^+\tau^-
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Fukae, S., Kim, C. S., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
The most general model-independent analysis of the lepton polarization asymmetries in the rare B decay, $\Bstt$, is presented. We present the longitudinal, normal and transverse polarization asymmetries for the $\tau^+ $ and $\tau^-$, and combinations of them, as functions of the Wilson coefficients of twelve independent four-Fermi interactions, ten of them local and two nonlocal. These procedures will tell us which type of operators contributes to the process. And it will be very useful to pin down new physics systematically, once we have the experimental data with high statistics and a deviation from the Standard Model is found., Comment: 24 pages, 8 figures, LaTeX
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- 1999
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39. Searching for New Physics in the b->d FCNC using B_s^0(t)->\phi K_s and B_d^0(t)->K^0\bar{K}^0
- Author
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Kim, C. S., London, D., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
Time-dependent measurements of the decays B_s^0(t)-->\phi K_s and B_d^0(t) --> K^0 \bar{K}^0 can be used to compare the weak phases of B_d^0-\bar{B}_d^0 mixing and the t-quark contribution to the b->d penguin. Since these two phases are equal in the standard model, any discrepancy would be a sign of new physics, specifically in the b->d flavour-changing neutral current (FCNC). The method can be applied to other pairs of decays, such as B_s^0(t)--> J/\Psi K_s and B_d^0(t)--> J/\Psi \pi^0., Comment: 16 pages, LaTeX, Modified and accepted for publication in Phys.Lett.B
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- 1999
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40. Clinical characteristics and course of oral somatic delusions: a retrospective chart review of 606 cases in 5 years
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Umezaki Y, Miura A, Shinohara Y, Mikuzuki L, Sugawara S, Kawasaki K, Tu TTH, Watanabe T, Suga T, Watanabe M, Takenoshita M, Yoshikawa T, Uezato A, Nishikawa T, Hoshiko K, Naito T, Motomura H, and Toyofuku A
- Subjects
Oral cenesthopathy ,Delusional disorder somatic type (DDST) ,Chart review ,Dentistry ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Yojiro Umezaki,1 Anna Miura,2 Yukiko Shinohara,2 Lou Mikuzuki,2 Shiori Sugawara,2 Kaoru Kawasaki,2 Trang TH Tu,2 Takeshi Watanabe,2 Takayuki Suga,2 Motoko Watanabe,3 Miho Takenoshita,2 Tatsuya Yoshikawa,2 Akihito Uezato,4 Toru Nishikawa,4 Ken Hoshiko,5 Toru Naito,1 Haruhiko Motomura,2 Akira Toyofuku2 1Section of Geriatric Dentistry, Department of General Dentistry, Fukuoka Dental College, Fukuoka, Japan; 2Department of Psychosomatic Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; 3Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Tokyo, Japan; 4Department of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; 5Department of Pharmacy, Dental Hospital, Tokyo Medical and Dental University, Tokyo, Japan Objective: Oral cenesthopathy is characterized by foreign body sensations without medical and dental evidence for them. It is thought to be a rare disease in psychiatry, but many patients are visiting dental clinics seeking treatment to remove a foreign body. Even though the features of oral cenesthopathy might be different between a psychiatric clinic and a dental clinic, there has been no clinico-statistical study from dentists. In this study, we report a clinico-statistical study of patients with oral cenesthopathy in dentistry. Methods: This is a retrospective chart review of 606 outpatients with oral cenesthopathy in Tokyo Medical and Dental University from April 2010 through to March 2015. Results: A total of 159 male and 447 female patients were included in this study. The mean age was 62.08 years, and female patients were older than male patients. The trigger of the dental treatment and the acute phase of depression at the onset were significantly related (p=0.037). Only 128 patients (36%) had clinically significant improvement after 6 months of pharmacotherapy. No history of psychiatric disorders (odds ratio [OR] 0.479 [95% confidence interval {CI}: 0.262–0.875], p=0.017) and longer duration of illness (>18 months) (OR 2.626 [95% CI: 1.437–4.799], p=0.002) were significant factors for clinical outcomes. Conclusion: Patients with oral cenesthopathy in our clinic were predominantly elderly female patients. Dental treatment in the acute phase of depression might be a risk factor for oral cenesthopathy. Therefore, comprehending the situation of psychiatric disorder and obtaining adequate informed consent might be required to prevent the trouble concerning oral cenesthopathy. Keywords: oral cenesthopathy, delusional disorder somatic type, DDST, chart review, dentistry
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- 2018
41. A Model Independent Analysis of the Rare B Decay B -> X_s l^+ l^-
- Author
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Fukae, S., Kim, C. S., Morozumi, T., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
The most general model-independent analysis of the rare $B$ decay, $\Bsll$, is presented. There are ten independent local four-Fermi interactions which may contribute to this process. The branching ratio, the forward-backward asymmetry, and the double differential rate are written as functions of the Wilson coefficients of the ten operators. We also study the correlation between the branching ratio and the forward-backward asymmetry by changing each coefficient. This procedure tells us which types of operator contribute to the process, and it will be very useful to pin down new physics systematically, once we have the experimental data with high statistics and the deviation from the Standard Model is found., Comment: 32 pages, 21 figures, LaTex
- Published
- 1998
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42. δ-Tocotrienol suppresses tumorigenesis by inducing apoptosis and blocking the COX-2/PGE2 pathway that stimulates tumor–stromal interactions in colon cancer
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Wada, S., Naito, Y., Matsushita, Y., Nouchi, M., Kawai, M., Minami, E., Aoi, W., Ikeda, S., Higashi, A., and Yoshikawa, T.
- Published
- 2017
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43. Early results of a randomized two-by-two factorial phase II trial comparing neoadjuvant chemotherapy with two and four courses of cisplatin/S-1 and docetaxel/cisplatin/S-1 as neoadjuvant chemotherapy for locally advanced gastric cancer
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Aoyama, T., Nishikawa, K., Fujitani, K., Tanabe, K., Ito, S., Matsui, T., Miki, A., Nemoto, H., Sakamaki, K., Fukunaga, T., Kimura, Y., Hirabayashi, N., and Yoshikawa, T.
- Published
- 2017
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44. Fatty acid composition of the postmortem corpus callosum of patients with schizophrenia, bipolar disorder, or major depressive disorder
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Hamazaki, K., Maekawa, M., Toyota, T., Dean, B., Hamazaki, T., and Yoshikawa, T.
- Published
- 2017
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45. Using B_s^0 Decays to Determine the CP Angles \alpha and \gamma
- Author
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Kim, C. S., London, D., and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
Dighe, Gronau and Rosner have shown that, by assuming SU(3) flavor symmetry and first-order SU(3) breaking, it is possible to extract the CP angles \alpha and \gamma from measurements of the decay rates of B_d^0(t) --> \pi^+\pi^-, B_d^0 --> \pi^- K^+ and B^+ --> \pi^+ K^0, along with their charge-conjugate processes. We extend their analysis to include the SU(3)-related decays B_s^0 --> \pi^+ K^-, B_s^0(t) --> K^+ K^- and B_s^0 --> K^0 {\bar K^0}. There are several advantages to this extension: discrete ambiguities are removed, fewer assumptions are necessary, and the method works even if all strong phases vanish. In addition, we show that \gamma can be obtained cleanly, with no penguin contamination, by using the two decays B_s^0(t) --> K^+ K^- and B_s^0 --> K^0 {\bar K^0}., Comment: 28 pages, LaTeX
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- 1997
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46. Test of the chiral structure and FCNC in the quark sector by radiative B meson decays
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Handoko, L. T. and Yoshikawa, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
We study the effects of a vector-like SU(2) quark doublet as a fourth generation. In this model we examine the chiral structure and the FCNC in the quark sector by using radiative B meson decays in the allowed region for parameters from $R_b = {\Gamma_{qq}}/{\Gamma_{had.}}$. We compute the ratio $R = {Br (b \to d \gamma)}/{Br (b \to s \gamma)}$ in the model which realizes a different chiral structure as well as FCNC. The constraints has been extracted from the experimental results of B meson decays, the $T_{new}$ parameter of oblique corrections and $R_b$. Under the natural assumption that the violation of the $V-A$ structure in the light-quark sector is small, we can determine the allowed region for most of the mixings parameters and the vector-like quark masses. We show that there will be significant deviations in $R$ from the SM prediction due to the FCNC's and the violation of the $V-A$ structure., Comment: 19 pages, figures included, revised version for publication (accepted in Int. Jour. Mod. Phys. A)
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- 1996
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47. Effective Lagrangian for a Technicolor Model without Exact Custodial Symmetry
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Yoshikawa, T., Takata, H., and Morozumi, T.
- Subjects
High Energy Physics - Phenomenology - Abstract
Effective Lagrangian including technimesons is constructed for a realistic one-family Technicolor model without exact custodial symmetry. Tree level contribution to oblique correction parameters $S$ and $U$ due to spin 1 technimesons are computed with the effective Lagrangian. An isospin breaking term which is associated with technilepton vector mesons gives a negative contribution to the electroweak radiative correction parameter $S$ due to mixing between $I=0$ and $I=1$ vector mesons. $U$ receives non-zero contribution due to exotic left-handed charged vector mesons and its sign can be both negative and positive., Comment: 30 pages plus 1 table and 4 figures (7 postscript files append.), Latex, (HUPD-9406)
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- 1994
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48. Incorporation of SiV-centers in diamond nanoparticles using silicon background doping
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Tegetmeyer, B., Lewes-Malandrakis, G., Wernet, M., Schreyvogel, C., Lang, N., Yoshikawa, T., and Nebel, C.E.
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- 2016
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49. Evaluation of seismic response characteristics of terrace slope based on array measurement of microtremor
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Hata, Y., primary, Yoshikawa, T., additional, Minato, F., additional, Tokida, K., additional, Murata, A., additional, Miyajima, M., additional, Yamada, M., additional, and Hada, K., additional
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- 2018
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50. Dirac gap opening and Dirac-fermion-mediated magnetic coupling in antiferromagnetic Gd-doped topological insulators and their manipulation by synchrotron radiation
- Author
-
Shikin, A. M., Estyunin, D. A., Surnin, Yu. I., Koroleva, A. V., Shevchenko, E. V., Kokh, K. A., Tereshchenko, O. E., Kumar, S., Schwier, E. F., Shimada, K., Yoshikawa, T., Saitoh, Y., Takeda, Y., and Kimura, A.
- Published
- 2019
- Full Text
- View/download PDF
Catalog
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