140 research outputs found
Magnetization process in a chiral p-wave superconductor with multi-domains
A simulation study for the magnetization process is performed for the
multi-domain state in a chiral p-wave superconductor, using the time-dependent
Ginzburg-Landau theory. The external field penetrates inside as core-less
vortices through the domain wall, forming the vortex sheet structure. We find
that, with increasing magnetic fields, the domain walls move so that the
unstable domains shrink to vanish. Therefore, the single domain structure is
realized at higher fields
Selective production of metallic carbon nanotubes
In this report, we discuss whether the optimal electric field to promote the
growth of armchair- type nanotubes (metallic character) evaluated using the
previous Huckel-Poisson method can be applied at the tip of a nanotube in a
realistic system. Setting the cross-section of a nanotube and the external
field by the sheath, we estimate an effective area at the sheath edge. Since
the electric charge distribution in a nanotube caused by the external electric
field was determined in our previous study, we obtained the electric field
distribution out of a nanotube by solving the Poisson equation and clarified
the structure of the electric field lines. By determining the effective area,
we show the optimal interval of the catalyst metal, which is necessary to
selectively grow the metallic nanotubes. When nanotubes grow thickly during the
initial stage of growth, a strong electric field cannot be applied to the tips
of the tubes. As a tube grows and the tube length increases, we found that the
optimal electric field decreased. To maintain the chemical activity at the tip,
the sheath electric field must be decreased. We estimated the decreasing rate
of the sheath field to the tube length.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,
Nice (France
Flux flow and pinning of the vortex sheet structure in a two-component superconductor
A simulation study using the time-dependent Ginzburg-Landau theory is
performed for the vortex state in two-component superconductors, such as
PrOs_4_Sb_12_. We investigate the flux flow and the pinning of the vortex sheet
structure. We find domain wall that traps half flux-quantum vortices and moves
with the flux flow. In the pinning case, we observe an emitting process of a
conventional vortex from the vortex sheet by combining a pair of half
flux-quantum vortices.Comment: 4 pages, 4 figures, to appear in Phys. Rev.
Vortex state in double transition superconductors
Novel vortex phase and nature of double transition field are investigated by
two-component Ginzburg-Landau theory in a situation where fourfold-twofold
symmetric superconducting double transition occurs. The deformation from 60
degree triangular vortex lattice and a possibility of the vortex sheet
structure are discussed. In the presence of the gradient coupling, the
transition changes to a crossover at finite fields. These characters are
important to identify the multiple superconducting phase in PrOs_4_Sb_12.Comment: 4 pages, 4 figures, to appear in Phys. Rev. Let
Variable Stars in the Magellanic Clouds: Results from OGLE and SIRIUS
We have performed a cross-identification between OGLE-II data and
single-epoch SIRIUS JHK survey data in the LMC and SMC. After eliminating
obvious spurious variables, we determined the pulsation periods for 9,681 and
2,927 variables in the LMC and SMC, respectively. Based on these homogeneous
data, we studied the pulsation properties and metallicity effects on period-K
magnitude (PK) relations by comparing the variable stars in the LMC and SMC.
The sample analyzed here is much larger, and we found the following new
features: (1) variable red giants in the SMC form parallel sequences on the PK
plane, just like those found by Wood (2000) in the LMC; (2) both of the
sequences A and B of Wood (2000) have discontinuities, and they occur at the
K-band luminosity of the TRGB; (3) the sequence B of Wood (2000) separates into
three independent sequences B+- and C'; (4) comparison between the theoretical
pulsation models (Wood et al. 1996) and observational data suggests that the
variable red giants on sequences C and newly discovered C' are pulsating in the
fundamental and first overtone mode, respectively; (5) the theory can not
explain the pulsation mode of sequences A+- and B+-, and they are unlikely to
be the sequences for the first and second overtone pulsators, as was previously
suggested; (6) the zero points of PK relations of Cepheids in the metal
deficient SMC are fainter than those of LMC ones by ~0.1 mag but those of SMC
Miras are brighter than those of LMC ones by ~0.13 mag, which are probably due
to metallicity effects.Comment: 9 pages, 10 figures, accepted for publication in MNRAS. High
resolution version is available at:
http://www.ioa.s.u-tokyo.ac.jp/~yita/scr/astro/papers/RefereedPaper/yitaMD250
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Individually Targeted Teaching in Social Studies Education ―A case study of “Elementary School Curriculum General Guidance Materials Ⅲ A Collection of Examples of Learning Guidance that Responds to Individual Differences”-
昭和59年に刊行された『小学校教育課程一般指導資料Ⅲ-個人差に応じる学習指導事例集-』に再注目し、「個別最適な学び」との関係から、個に応じた指導について考察を行った。社会科教育における「個に応じた指導」の課題の1点目として、目標を安易に個別化せず、共通目標達成のための方法を学級の子ども一人ひとりをイメージしながら学習問題や本時のめあてを検討・設定していくことの重要性について論じる。課題の2点目として、一人学習ができにくい子への支援について社会科教育ではどのように捉え実践されているか考察することの重要性について論じる。departmental bulletin pape
A Retrospective Analysis of Transfusion Management for Obstetric Hemorrhage in a Japanese Obstetric Center
Background. Since cryoprecipitate, fibrinogen concentrate, or recombinant activated factor VII is not approved by public medical insurance in Japan, we retrospectively assessed blood product usage in patients with obstetric hemorrhage at our tertiary obstetric center. Material and Methods. 220 patients with obstetric hemorrhagic disorders who underwent blood product transfusion in our institution during a 5-year period were reviewed for the types and volumes of blood products transfused. Results. There was a significant positive correlation (P< 0.001) between the volume of RCC (red blood cell concentrate) transfused and that of FFP (fresh frozen plasma), irrespective of underlying obstetric disorders. The median of FFP to RCC ratio in each patient was 1.3–1.4, when 6 or more units of RCC were transfused. Conclusions. In transfusion for massive obstetric hemorrhage in terms of appropriate supplementation of coagulation factors, the transfusion of RCC : FFP = 1 : 1.3–1.4 may be desirable
Alveolar Bone Microstructure Surrounding Orthodontic Anchor Screws with Plasma Surface Treatment in Rats
A lateral load was applied to anchor screws that had undergone surface treatment, and the structure, cellular dynamics, and quality of the bone surrounding anchor screws were analyzed to investigate the effect of this surface treatment on the peri-implant jawbone. In addition, bone microstructural characteristics were quantitatively evaluated for each site of loading on the bone around the anchor screw. Rats were euthanized after observation on days 3, 5, or 7, and bone quality analyses were performed. Bone–implant contact rate increased more rapidly at an early stage in the treated surface group than in the untreated surface group. Bone lacuna morphometry showed that the measured values adjacent to the screw at the screw neck on the compressed side (A) and at the screw tip on the uncompressed side (D) were significantly lower than those at the screw tip on the compressed side (B) and at the screw neck on the uncompressed side (C). Collagen fiber bundle diameter showed that the measured values adjacent to regions A and D were significantly higher than those at regions B and C. Anchor screw surface activation facilitates initial bone contact of the screw, suggesting that early loading may be possible in clinical practice.Okawa K., Matsunaga S., Kasahara N., et al. Alveolar Bone Microstructure Surrounding Orthodontic Anchor Screws with Plasma Surface Treatment in Rats. Journal of Functional Biomaterials 14, 356 (2023); https://doi.org/10.3390/jfb14070356
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