311 research outputs found
The candidates of long-periodic variable sources in 6.7 GHz methanol masers associated with four high-mass star-forming regions
Results of the long-term monitoring observations of the 6.7 GHz Class II
methanol masers associated with the four high-mass star-forming regions by
Hitachi 32-m radio telescope are presented. We detected periodic flux
variability in G06.795-0.257, G10.472+0.027, G12.209-0.102, and G13.657-0.599
with the periods of 968, 1624, 1272, and 1266 d, respectively, although the
detected period is tentative due to the short monitoring term relative to the
estimated period. The facts that the flux variation patterns show the symmetric
sine curves and that the luminosities of the central protostar and periods of
maser flux variation are consistent with the expected period-luminosity (PL)
relation suggest that the mechanisms of maser flux variability of G10.472+0.027
and G12.209-0.102 can be explained by protostellar pulsation instability. From
the PL relation, central stars of these two sources are expected to be very
high-mass protostars with a mass of 40 M and to have the mass accretion rate of
2*10-2 M yr-1. On the other hand, G06.795-0.257 and G13.657-0.599 have the
intermittent variation patterns and have luminosities that are an order of
magnitude smaller than those expected from PL relation, suggesting variation
mechanisms of these sources originated from binary system. Since almost all the
maser features vary with the same period regardless of its geometry, periodic
accretion model may be appropriate mechanisms for flux variability in
G06.795-0.257 and G13.657-0.599.Comment: arXiv admin note: text overlap with arXiv:2301.0143
Josephson junction in cobalt-doped BaFe2As2 epitaxial thin films on (La, Sr)(Al, Ta)O3 bicrystal substrates
Josephson junctions were fabricated in epitaxial films of cobalt-doped
BaFe2As2 on [001]-tilt (La,Sr)(Al,Ta)O3 bicrystal substrates. 10m-wide
microbridges spanning a 30-degrees-tilted bicrystal grain boundary (BGB bridge)
exhibited resistively-shunted-junction (RSJ)-like current-voltage
characteristics up to 17 K, and the critical current was suppressed remarkably
by a magnetic field. Microbridges without a BGB did not show the RSJ-like
behavior, and their critical current densities were 20 times larger than those
of BGB bridges, confirming BGB bridges display a Josephson effect originating
from weakly-linked BGB
Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates
High critical current densities (Jc) > 1 MA/cm2 were realized in cobalt-doped
BaFe2As2 (BaFe2As2:Co) films on flexible metal substrates with
biaxially-textured MgO base-layers fabricated by an ion-beam assisted
deposition technique. The BaFe2As2:Co films showed small in-plane crystalline
misorientations (delta fai BaFe2As2:Co) of ~3o regardless of doubly larger
misorientaions of the MgO base-layers (delta fai MgO = 7.3o), and exhibited
high self-field Jc up to 3.5 MA/cm2 at 2 K. These values are comparable to that
on MgO single crystals and the highest Jc among iron pnictide superconducting
tapes and wires ever reported. High in-field Jc suggests the existence of
c-axis correlated vortex pinning centers.Comment: Published in Appl. Phys. Let
Flap Reconstruction for Esophageal Perforation Following Anterior Cervical Plate Fixation
Anterior cervical plate fixation is a common surgical treatment for cervical spine trauma, disc herniation, or cervical spondylosis. Esophageal perforation following anterior cervical plate fixation is a rare but serious complication. Management of esophageal perforation is controversial; however, we suggest treating most cases surgically because this condition is slow to heal and often fatal. We managed 2 cases of esophageal perforation following anterior cervical plate fixation by flap reconstruction with the pectoralis major muscle in one case and a jejunal free flap in the other. Here, we report our experience and review the surgical indications
Effect of Starvation on Immunological Function of Chicks : I. Effect on Humoral Immunity
隔日絶食による長期間の飢餓状態におけるニワトリヒナのGRBC及びBAに対する抗体産生能力を調べることにより,液性免疫機能に及ぼす飢餓の影響について試験した. 本試験において得られた結果は以下のようである. (1)絶食期間中,ヒナの体重増加はまったく認められず,強度の飢餓状態にあると思われた. (2)飢餓状態にあるヒナでは,抗GRBC,抗BA共に抗体価が上昇する傾向が示された. (3)血中のγ-グロブリン総量及び産生された抗体中のIgM比率については,対照との間に差が認められなかった. (4)飢餓状態のヒナにより産生される抗GRBC抗体の半減期は,対照に比べ有意に長いことが示された. 以上の結果から,長期にわたる飢餓にさらされたヒナでは,産生される抗体の血中からの消退が遅延し,その結果,抗体価が上昇するものと思われた. これは,抗体産生の亢進によるものではなく,産生された抗体の分解遅延に起因するものと思われた
Tsukuba 32-m VLBI Station
The Tsukuba 32-m VLBI station is operated by the Geospatial Information Authority of Japan. This report summarizes activities of the Tsukuba 32-m VLBI station in 2012. More than 200 sessions were observed with the Tsukuba 32-m and other GSI antennas in accordance with the IVS Master Schedule of 2012. We have started installing the observing facilities that will be fully compliant with VLBI2010 for the first time in Japan
Laparoscopic extra-abdominal suturing technique for the repair of Larrey’s diaphragmatic hernia using the port closure needle (Endo Close®): A case report
AbstractIntroductionMorgagni’s or Larrey’s diaphragmatic hernias are relatively uncommon. If the defect is too large for primary closure, the use of a mesh is inevitable. Although primary closure is adaptable for relatively small defects, it is difficult to suture the hernial orifice in which the anterior rim is absent. Herein, we present the case of a patient with Larrey’s diaphragmatic hernia that was easily and securely repaired using the recently developed laparoscopic extra-abdominal suturing technique via the port closure needle (Endo Close®; Medtronic, Minneapolis, USA).Presentation of caseAn 89-year-old woman complaining of vomiting was transferred to our hospital. Computed tomography scan showed Larrey’s diaphragmatic hernia. Laparoscopic repair was performed after gastric decompression. We diagnosed Larrey’s hernia on the left side of the falciform ligament. The transverse colon was herniated through the defect. Since the hernial defect was located below the substernal space, there was no tissue to stitch at the anterior rim of the hernial orifice. We performed the extra-abdominal suturing technique, suturing the posterior rim of the hernia to the full thickness of the anterior abdominal wall using the port closure needle (Endo Close®) without the need for a mesh. The patient was discharged on the 8th postoperative day. There was no evidence of recurrence at 8 months postoperatively.DiscussionThe recently developed extra-abdominal suturing technique using Endo Close® to suture the full thickness of the anterior abdominal wall achieved secure mattress suture and easy extra-abdominal tying.ConclusionThis method may be useful in terms of easiness and security of suture
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