92 research outputs found
Nature of a Strongly-Lensed Submillimeter Galaxy SMM J14011+0252
We have carried out near-infrared JHK spectroscopy of a gravitationally
lensed submillimeter galaxy SMM J14011+0252 at z=2.565, using OHS and CISCO on
the Subaru telescope. This object consists of two optical components, J1 and
J2, which are lensed by the cluster Abell 1835. J1 suffers additional strong
lensing by a foreground galaxy at z=0.25 in the cluster. The rest-optical
H-alpha, H-beta, and [O II]3727 lines are detected in both J1 and J2, and [N
II]6548,6583 lines are also detected in J1. A diagnosis of emission-line ratios
shows that the excitation source of J1 is stellar origin, consistent with
previous X-ray observations. The continua of J1 and J2 show breaks at rest
4000A, indicating relatively young age. Combined with optical photometry, we
have carried out model spectrum fitting of J2 and find that it is a very young
(~50 Myr) galaxy of rather small mass (~10e8 M_sol) which suffers some amount
of dust extinction. A new gravitational lensing model is constructed to assess
both magnification factor and contamination from the lensing galaxy of the
component J1, using HST-F702W image. We have found that J1 suffers strong
lensing with magnification of ~30, and its stellar mass is estimated to be <
10e9 M_sol. These results suggest that SMM J14011+0252 is a major merger system
at high redshift that undergoes intense star formation, but not a formation
site of a giant elliptical. Still having plenty of gas, it will transform most
of the gas into stars and will evolve into a galaxy of < 10e10 M_sol.
Therefore, this system is possibly an ancestor of a less massive galaxy such as
a mid-sized elliptical or a spiral at the present.Comment: 21 pages, 11 figures. Accepted for publication in Astronomical
Journa
A study of a karate trial teaching class in a teacher training course − based on students’ formative assessment
[EN] The purpose of this study was to examine the effectiveness of a karate trial teaching class in an initial teacher training course, through students’ formative assessment. It involved two case studies of trial teaching classes of karate and that of two other activities, taught by the students of an initial teacher training course. The results were assessed using the Students’ Formative Assessment of Physical Education (P.E.) Classes scale. Results showed significant differences between groups in “New discovery” (p<.05) and a trend toward statistical significance in “Skill growth”, “Fun Exercise” and “Learning friendly” (p<.10) based on the classes provided by karate and other teaching materials. This implies that karate might have different acute effects on students’ learning process in the context of school-level physical education
Gene Expression Profiles of the Cochlea and Vestibular Endorgans: Localization and Function of Genes Causing Deafness
Objectives: We sought to elucidate the gene expression profiles of the causative genes as well as the localization of the encoded proteins involved in hereditary hearing loss. Methods: Relevant articles (as of September 2014) were searched in PubMed databases, and the gene symbols of the genes reported to be associated with deafness were located on the Hereditary Hearing Loss Honnepage using localization, expression, and distribution as keywords. Results: Our review of the literature allowed us to systematize the gene expression profiles for genetic deafness in the inner ear, clarifying the unique functions and specific expression patterns of these genes in the cochlea and vestibular endorgans. Conclusions: The coordinated actions of various encoded molecules are essential for the normal development and maintenance of auditory and vestibular function.ArticleANNALS OF OTOLOGY RHINOLOGY AND LARYNGOLOGY. 124:6S-48S (2015)journal articl
Infrared Spectroscopy of 15 Radio Galaxies at 2<z<2.6
Near-infrared spectra of 15 high-redshift radio galaxies (HzRGs) located at
were obtained by the OH Airglow Suppressor spectrograph mounted on
the Subaru telescope. The UV-optical line ratio diagnostic diagrams indicate
that half of the observed HzRGs have extended emission-line regions with low
metal abundance, photoionized by a flat-continuum active galactic nucleus such
as a quasar. We also found two probable correlations between radio and
rest-optical parameters: (1) HzRGs with massive hosts tend to have a redder
rest-optical continuum, and (2) HzRGs with smaller radio sizes also show a
redder optical continuum. On the basis of the correlations, the nature of HzRGs
at is discussed.Comment: 23 pages, 7 figures, Corrected typos and style. Accepted for
publication in ApJ (November 20, 2003
Denoising approach with deep learning-based reconstruction for neuromelanin-sensitive MRI: image quality and diagnostic performance
[Purpose]Neuromelanin-sensitive MRI (NM-MRI) has proven useful for diagnosing Parkinson’s disease (PD) by showing reduced signals in the substantia nigra (SN) and locus coeruleus (LC), but requires a long scan time. The aim of this study was to assess the image quality and diagnostic performance of NM-MRI with a shortened scan time using a denoising approach with deep learning-based reconstruction (dDLR).[Materials and methods]We enrolled 22 healthy volunteers, 22 non-PD patients and 22 patients with PD who underwentNM-MRI, and performed manual ROI-based analysis. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) in ten healthy volunteers were compared among images with a number of excitations (NEX) of 1 (NEX1), NEX1 images with dDLR (NEX1+dDLR) and 5-NEX images (NEX5). Acquisition times for NEX1 and NEX5 were 3 min 12 s and 15 min 58 s, respectively. Diagnostic performances using the contrast ratio (CR) of the SN (CR_SN) and LC (CR_LC) and those by visual assessment for diferentiating PD from non-PD were also compared between NEX1 and NEX1+dDLR.[Results]Image quality analyses revealed that SNRs and CNRs of the SN and LC in NEX1+dDLR were signifcantly higherthan in NEX1, and comparable to those in NEX5. In diagnostic performance analysis, areas under the receiver operating characteristic curve (AUC) using CR_SN and CR_LC of NEX1+dDLR were 0.87 and 0.75, respectively, which had no signifcant diference with those of NEX1. Visual assessment showed improvement of diagnostic performance by applying dDLR.[Conclusion]Image quality for NEX1+dDLR was comparable to that of NEX5. dDLR has the potential to reduce scan time of NM-MRI without degrading image quality. Both 1-NEX NM-MRI with and without dDLR showed high AUCs for diagnosing PD by CR. The results of visual assessment suggest advantages of dDLR. Further tuning of dDLR would be expected to provide clinical merits in diagnosing PD
中学校武道領域における空手道授業に関する研究 ―教員養成課程の模擬授業の検討を通して―
The purpose of this study was to examine the effectiveness of a Karate trial teaching class in an initialteacher training course, through the student's formative assessment. It involved two case studies of trial teaching classes of Karate and that of two other activities, taught by the students of an initial teacher training course. The results were assessed using the Student's Formative Assessment of Physical Education Classes scale developed by Takahashi et.al(1994). Results of the study indicate that the students' formative assessment shows were significantly different (“new discovery”: p<.05) and show a trend toward statistical significance (‘Skill growth': p<.10, ‘Fun Exercise': p<.10, ‘Learning friendly': p<.10) based on the classes provided by Karate and other teaching materials. This implies that Karate might have different effects on the learning of students compared to other activities as teaching materials in school-level physical education
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