77 research outputs found
A Research on School Principals’ Recognition of Current Situations and Issues in Regard to the Promotion of ICT Use at Schools
本稿の目的は,校長を対象とした調査研究を通じて,教育の情報化の現状と課題に関する校長の認識を把握し,教育の情報化の推進に寄与しうる基礎的知見を得ることである。そのために,具体的には以下の点について検討した。① ICT の利用に関する現任校や自身の現状に対する校長の認識,②学校全体としてICT の活用を進めていくための改善の必要性に対する校長の認識,③ ICT の利用に関する現状認識の差異による改善の必要性に関する認識の差異,④教育の情報化を進めたり,ICT を活用したりするなかで,当初予想していなかった成果・効果,⑤教育の情報化を進めたり,ICT を活用したりするなかで,当初予想していなかった課題・問題
Mass Estimates of a Giant Planet in a Protoplanetary Disk from the Gap Structures
A giant planet embedded in a protoplanetary disk forms a gap. An analytic
relationship among the gap depth, planet mass , disk aspect ratio ,
and viscosity has been found recently, and the gap depth can be
written in terms of a single parameter . We discuss how observed gap features can be used to constrain the
disk and/or planet parameters based on the analytic formula for the gap depth.
The constraint on the disk aspect ratio is critical in determining the planet
mass so the combination of the observations of the temperature and the image
can provide a constraint on the planet mass. We apply the formula for the gap
depth to observations of HL~Tau and HD~169142. In the case of HL~Tau, we
propose that a planet with is responsible for the observed gap at
~AU from the central star based on the estimate that the gap depth is
. In the case of HD~169142, the planet mass that causes the gap
structure recently found by VLA is . We also argue that the
spiral structure, if observed, can be used to estimate the lower limit of the
disk aspect ratio and the planet mass.Comment: 16 pages, 5 figures, accepted for publication in The Astrophysical
Journal Letter
血中の2,3,4,7,8-五塩化ダイベンゾフラン(PeCDF)の個人の半減期:油症患者における臨床症状並びに検診結果との関係
BACKGROUND:
In 1968, many people developed dioxin poisoning (Yusho) in Japan. Ingestion of 2,3,4,7,8-pentachlorodibenzofuran (2,3,4,7,8-PeCDF) was considered to be the cause of this poisoning. Although some patients had high concentrations of 2,3,4,7,8-PeCDF in their blood, individuals' half-lives of 2,3,4,7,8-PeCDF were long.
OBJECTIVES:
To evaluate the relationship between clinical and laboratory parameters and the individual half-life of 2,3,4,7,8-PeCDF in blood.
METHODS:
Clinical and laboratory data were collected during annual check-ups from 2001 to 2008. We enrolled 71 patients, who were measured more than 3 times, and who had 2,3,4,7,8-PeCDF concentrations in blood >50pgg(-1) lipid. The half-life of 2,3,4,7,8-PeCDF for each patient was estimated using linear regression. Moreover, relationships between clinical and laboratory parameters and individual half-life were investigated by linear regression.
RESULTS:
A shortened individual half-life for 2,3,4,7,8-PeCDF was significantly correlated with an increased red blood cell count, increased viscous secretions from the meibomian glands, existing black comedones, and severe cedar pollen allergy.
CONCLUSIONS:
Symptoms that accelerate excretion of lipids from the body, such as viscous secretions from the meibomian glands, may lead to a shorter half-life of 2,3,4,7,8-PeCDF. Red blood cells are related to the half-life of 2,3,4,7,8-PeCDF. However, further studies are required to investigate the excretory mechanism of 2,3,4,7,8-PeCDF.博士(医学)・乙1325号・平成26年3月17
ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya
We present a high-resolution (2.5 au) multiband analysis of the
protoplanetary disk around TW Hya using ALMA long baseline data at Bands 3, 4,
6, and 7. We aim to reconstruct a high-sensitivity millimeter continuum image
and revisit the spectral index distribution. The imaging is performed by
combining new ALMA data at Bands 4 and 6 with available archive data. Two
methods are employed to reconstruct the images; multi-frequency synthesis (MFS)
and the fiducial image-oriented method, where each band is imaged separately
and the frequency dependence is fitted pixel by pixel. We find that the MFS
imaging with the second order of Taylor expansion can reproduce the frequency
dependence of the continuum emission between Bands 3 and 7 in a manner
consistent with previous studies and is a reasonable method to reconstruct the
spectral index map. The image-oriented method provides a spectral index map
consistent with the MFS imaging, but with a two times lower resolution. Mock
observations of an intensity model were conducted to validate the images from
the two methods. We find that the MFS imaging provides a high-resolution
spectral index distribution with an uncertainty of ~\%. Using the
submillimeter spectrum reproduced from our MFS images, we directly calculated
the optical depth, power-law index of the dust opacity coefficient (),
and dust temperature. The derived parameters are consistent with previous
works, and the enhancement of within the intensity gaps is also
confirmed, supporting a deficit of millimeter-sized grains within the gaps.Comment: 17pages, 12 figures, Accepted for publication in The Astrophysical
Journa
Upgrading of shielding for rare decay search in CANDLES
In the CANDLES experiment aiming to search for the very rare neutrino-less double beta decays (0νββ) using 48Ca, we introduced a new shielding system for high energy γ-rays from neutron captures in massive materials near the detector, in addition to the background reduction for 232Th decays in the 0νββ target of CaF2 crystals. The method of background reduction and the performance of newly installed shielding system are described
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