427 research outputs found
Episodic transient deformation revealed by the analysis of multiple GNSS networks in the Noto Peninsula, central Japan
流体とスロースリップに駆動された能登半島群発地震 --ソフトバンク独自基準点データを用いた地殻変動解析結果--. 京都大学プレスリリース. 2023-06-13.Since November 30, 2020, an intense seismic swarm and transient deformation have been continuously observed in the Noto Peninsula, central Japan, which is a non-volcanic/geothermal area far from major plate boundaries. We modeled transient deformation based on a combined analysis of multiple Global Navigation Satellite System (GNSS) observation networks, including one operated by a private sector company (SoftBank Corp.), relocated earthquake hypocenters, and tectonic settings. Our analysis showed a total displacement pattern over 2 years shows horizontal inflation and uplift of up to ~ 70 mm around the source of the earthquake swarm. In the first 3 months, the opening of the shallow-dipping tensile crack had an estimated volumetric increase of ~ 1.4 × 10⁷ m³ at a depth of ~ 16 km. Over the next 15 months, the observed deformation was well reproduced by shear-tensile sources, which represent an aseismic reverse-type slip and the opening of a southeast-dipping fault zone at a depth of 14–16 km. We suggest that the upwelling fluid spread at a depth of ~ 16 km through an existing shallow-dipping permeable fault zone and then diffused into the fault zone, triggering a long-lasting sub-meter aseismic slip below the seismogenic depth. The aseismic slip further triggered intense earthquake swarms at the updip
オフィスビルにおける空調設定スケジュールの進化型多目的最適化
電気通信大学202
Host Galaxies of Hard X-ray Selected Type-2 Active Galactic Nuclei at Intermediate Redshifts
We study properties of the host galaxies of 15 hard X-ray selected type-2
active galactic nuclei (AGNs) at intermediate redshifts (0.050.6) detected
in surveys. The absorption corrected hard X-ray luminosities range from 10 erg s to erg s. We took
the -band image of these AGNs with the University of Hawaii 2.2 m telescope.
Thanks to the intrinsic obscuration of nuclear light, we can decompose the
galaxies with a spheroid component and a disk component. The resulting spheroid
luminosities correlate with ; higher (lower) X-ray luminosity
AGNs tend to reside in luminous (less luminous) spheroids. It is also found
that the hosts of luminous AGNs show a large spheroid-to-disk luminosity ratio
(1), while those of less luminous AGNs spread between 0 and 1. The
correlation between and spheroid luminosity indicates that
the relation between mass of a supermassive black hole (SMBH) and spheroid
luminosity (BS-relation) at the intermediate redshifts. The BS-relation agrees
with that in the local universe if the Eddington ratio of 0.24 is adopted,
which is a mean value determined from our type-1 AGN sample at similar
redshifts through the broad-line width and continuum luminosity. The present
study demonstrates the effectiveness of using type-2 AGNs at high redshifts to
study their host properties.Comment: 21 pages, 8 figures, ApJ accepte
Trajectory analysis for fusion path in superheavy-mass region
We propose an effective method for the precise investigation of the
fusion-fission mechanism in the superheavy-mass region, using the
fluctuation-dissipation model. The trajectory calculation with friction is
performed in the nuclear deformation space using the Langevin equation. In the
reaction Ca+Pu, the trajectories are classified into the
fusion-fission process, the quasi-fission process and the deep quasi-fission
process. By analyzing the time evolution of each trajectory, the mechanism of
each process is clearly revealed, i.e., it is explained why a trajectory takes
a characteristic path in this model. We discuss, in particular, the condition
under which the fusion path is followed, which is crucial in the discussion of
the possibility of synthesizing superheavy elements.Comment: 25 pages, 12 figures, accepted for publication in Nuclear Physics
Successful Endoscopic Resection of an Early Carcinoma of the Duodenum
We describe a patient in whom an early carcinoma of the duodenum was able to be resected
endoscopically. A 77-year-old man presented with epigastric pain. Upper gastrointestinal
endoscopy revealed a mass in the duodenum, and the patient was admitted. A whitish nodular
aggregated lesion, measuring 20 mm in diameter, was found in the second portion of the
duodenum. Examination of a biopsy specimen showed a Group III tubular adenoma. Endoscopic ultrasonography showed that the lesion was confined to the mucosa. The large size
of the lesion suggested the possibility of malignancy. Endoscopic mucosal resection was
therefore performed. Histopathologically, the diagnosis was carcinoma in adenoma. The
depth of invasion was mucosal. We conclude that endoscopic muosal resection can be used
to treat mucosal lesions arising in the duodenum
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