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753 results on '"Ebihara, K."'

1. Emergence of crack tip plasticity in semi-brittle α-Fe.

Author

Suzudo, T., Ebihara, K., Tsuru, T., and Mori, H.

Subjects
*MACHINE learning, *MATERIAL plasticity, *BRITTLE fractures, *METAL fractures, *CRACK propagation (Fracture mechanics)
Abstract

Fractures in body-centered-cubic metals and alloys below the ductile-to-brittle transition temperature are brittle. This is theoretically explained by the notion that the critical stress intensity factor of a given crack front for brittle fracture is smaller than that for plastic deformation; hence, brittle fracture is selected over plastic deformation. Although this view is true from a macroscopic perspective, such a fracture is always accompanied by small-scale plastic deformation near the crack tip, that is, crack tip plasticity. This paper investigates the origin of this plasticity using atomistic modeling with the machine learning interatomic potential of α -Fe. Some plastic modes are activated by rapid crack propagation, whereas no plasticity is activated when the crack tips are gradually fractured. The group of activated atoms dynamically caused by brittle crack propagation was identified as the precursor of plasticity. [ABSTRACT FROM AUTHOR]

Published
2024
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2. LLRF controls in SuperKEKB Phase-1 commissioning

Author

Kobayashi, T., Akai, K., Ebihara, K., Kabe, A., Nakanishi, K., Nishiwaki, M., Odagiri, J., Yoshimoto, S., and Hirosawa, K.

Subjects
Physics - Accelerator Physics
Abstract

First beam commissioning of SuperKEKB (Phase-1), which is an asymmetry double ring collider of 7-GeV electron and 4-GeV positron beams, which had started from February, has been successfully accomplished at the end of June 2016, and the desired beam current for Phase-1 was achieved in both rings. This paper summarize the operation results related to low level RF (LLRF) control issues during the Phase-1 commissioning, including the system tuning, the coupled bunch instability and the bunch gap transient effect. RF system of SuperKEKB consists of about thirty klystron stations in both rings. Newly developed LLRF control systems were applied to the nine stations among the thirty for Phase-1. The RF reference signal distribution system has been also upgraded for SuperKEKB. These new systems worked well without serious problem and they contributed to smooth progress of the commissioning. The old existing systems, which had been used in the KEKB operation, were still reused for the most stations, and they also worked as soundly as performed in the KEKB operation., Comment: Poster presented at LLRF Workshop 2017 (LLRF2017, arXiv:1803.07677)

Published
2018

4. Compensation of the Crossing Angle with Crab Cavities at KEKB

Author

Abe, T., Akai, K., Akemoto, M., Akiyama, A., Arinaga, M., Ebihara, K., Egawa, K., Enomoto, A., Flanagan, J., Fukuda, S., Fukuma, H., Funakoshi, Y., Furukawa, K., Furuya, T., Hara, K., Higo, T., Hiramatsu, S., Hisamatsu, H., Honma, H., Honma, T., Hosoyama, K., Ieiri, T., Iida, N., Ikeda, H., Ikeda, M., Inagaki, S., Isagawa, S., Ishii, H., Kabe, A., Kadokura, E., Kageyama, T., Kakihara, K., Kako, E., Kamada, S., Kamitani, T., Kanazawa, K., Katagiri, H., Kato, S., Kawamoto, T., Kazakov, S., Kikuchi, M., Kikutani, E., Kitagawa, K., Koiso, H., Kojima, Y., Komada, I., Kubo, T., Kudo, K., Kudo, N., Marutsuka, K., Masuzawa, M., Matsumoto, S., Matsumoto, T., Michizono, S., Mikawa, K., Mimashi, T., Mitsunobu, S., Mori, K., Morita, A., Morita, Y., Nakai, H., Nakajima, H., Nakamura, T. T., Nakanishi, H., Nakanishi, K., Nakao, K., Ninomiya, S., Ogawa, Y., Ohmi, K., Ohsawa, S., Ohsawa, Y., Ohnishi, Y., Ohuchi, N., Oide, K., Ono, M., Ozaki, T., Saito, K., Sakai, H., Sakamoto, Y., Sato, M., Satoh, M., Shibata, K., Shidara, T., Shirai, M., Shirakawa, A., Sueno, T., Suetake, M., Suetsugu, Y., Sugahara, R., Sugimura, T., Suwada, T., Tajima, O., Takano, S., Takasaki, S., Takenaka, T., Takeuchi, Y., Tawada, M., Tejima, M., Tobiyama, M., Tokuda, N., Uehara, S., Uno, S., Yamamoto, Y., Yano, Y., Yokoyama, K., Yoshida, Ma., Yoshida, Mi., Yoshimoto, S., Yoshino, K., KEK, Oho, Tsukuba, Perevedentsev, E., Shatilov, D. N., and BINP

Subjects
Physics - Instrumentation and Detectors
Abstract

Crab cavities have been installed in the KEKB B--Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been done since February 2007. This is the first experience with such cavities in colliders or storage rings. The crab cavities have been working without serious issues. While higher specific luminosity than the geometrical gain has been achieved, further study is necessary and under way to reach the prediction of simulation., Comment: Submitted to Particle Accelerator Conference 2007, MOZAKI01, Albuquerque

Published
2007

6. Development of rf reference line for the linear collider

Author

Naito, T., Ebihara, K., Hayano, H., and Urakawa, J.

Subjects
High Energy Physics - Experiment
Abstract

The rf distribution system for the linear collider requires stable x-band(11.424GHz) rf phase signal over 25km length. In order to realize the distribution system, a fiber optic link using a phase stabilized optical fiber was tested. The phase stabilized optical fiber has been employed at LEP, KEKB, etc.. This paper describes the hardware system and result of the preliminary test of the feed back system for stabilization of the phase change., Comment: LINAC2000 THA04

Published
2000

7. Serum Leptin Level Is a Regulator of Bone Mass

Author

Elefteriou, F., Takeda, S., Ebihara, K., Magre, J., Patano, N., Kim, C. Ae, Ogawa, Y., Liu, X., Ware, S. M., Craigen, W. J., Robert, J. J., Vinson, C., Nakao, K., Capeau, J., Karsenty, G., and Chambon, Pierre

Published
2004

9. Value and protection of geographical indications by the Japanese Wine Law

Author

Ebihara K. and Omura M.

Subjects
Microbiology, QR1-502, Physiology, QP1-981, Zoology, QL1-991
Abstract

Recently, Japanese wine law has changed dramatically. In October 2015, the definition of “Japan wine” and the labelling rules were introduced, and the registration guidelines for the geographical indication (GI) were formulated. Up to now, the Commissioner of the National Tax Agency has designated two wine GIs: “Yamanashi” and “Hokkaido”. However, it is not easy for Japanese consumers to understand the value and the role of GI. The National Tax Agency, prefectures, municipal authorities and winery associations organise from time to time promotional events of GI wines to spread the notion of GI. Even though the majority of “Japan wine”, including GI wine, is consumed in the internal market, it is necessary to protect the Japanese GIs in foreign countries. Due to the EU-Japan EPA that ensures the mutual protection of GIs, it is quite probable that the GI will play an important role in the export of Japanese wine, liquor and agricultural products.

Published
2019
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22. Numerical simulation of droplet flows and evaluation of interfacial area

Author

Watanabe, T. and Ebihara, K.

Subjects
Drops -- Models, Mathematical models -- Research, Fluid dynamics -- Models, Engineering and manufacturing industries, Science and technology
Abstract

Droplet flows with coalescence and breakup are simulated numerically using the lattice Boltzmann method. It is shown that the rising velocities are in good agreement with those obtained by the force balance and the empirical correlation. The breakup of droplets after coalescence is simulated well in terms of the critical Weber number A numerical method to evaluate the interfacial area and the volume fraction in two-phase flows is proposed. It is shown that the interfacial area corresponds to the shape, the number and the size of droplets, and the proposed method is effective for numerical evaluation of interfacial area even if the interface changes dynamically. [DOI: 10.1115/1.1490128]

Published
2002

35. Optical emission study of ablation plasma plume in the preparation of diamond-like carbon films by KrF excimer laser

Author

Yamagata, Y., Sharma, A., Narayan, J., Mayo, R.M., Newman, J.W., and Ebihara, K.

Subjects
Carbon -- Research, Excimer lasers -- Usage, Semiconductor films -- Research, Thin films -- Optical properties, Physics
Abstract

Research was conducted to examine the optical emission measurements for the ablation plasma plume of graphite carbon during the preparation of a diamond-like carbon (DLC) thin film using a KrF excimer pulsed laser deposition (PLD). A monochromator with an intensified optical multichannel analyzer having gating functions was used to investigate spatially and spectrally resolved optical emission. Results indicate that the C2 molecule in the ablated plasma plume is not conducive but energetic species are very critical for producing high quality DLC films using PLD.

Published
1999

46. Experimental studies of microwave amplification in the ion-focused regime

Author

Whittum, D.H., Ebihara, K., Hiramatsu, S., Kishiro, J., Monaka, T., Ozaki, T., and Takayama, K.

Subjects
Free electron lasers -- Research, Electron beams -- Research, Microwave amplifiers -- Research, Business, Chemistry, Electronics, Electronics and electrical industries
Abstract

Studies are reported of microwave amplification with an ion-focused electron beam drawn from an induction injector. A free-electron laser (FEL) operating at 9.4 GHz and employing ion-focusing within the interaction region has achieved power in excess of 30 MW at 9.4 GHz, with a beam energy of 0.8 MeV and current of 0.7 kA. Peak gain is 20 dB/m, with no saturation after 15 wiggler periods. Also reported are the first evolution and detuning data for an ion-channel laser/maser (ICL). Two shortcomings of the prematurely halted ICL studies are noted: poor frequency discrimination and a large axial plasma gradient. Prospects for operation with an upgraded 1.6 MeV accelerator are discussed.

Published
1993

48. RF systems for the KEK B-Factory

Author

Akai, K, Akasaka, N, Ebihara, K, Ezura, E, Furuya, T, Hara, K, Hosoyama, K, Isagawa, S, Kabe, A, Kageyama, T, Kojima, Y, Mitsunobu, S, Mizuno, H, Morita, Y, Nakai, H, Nakanishi, H, Ono, M, Sakai, H, Suetake, M, Tajima, T, Takeuchi, Y, Yamazaki, Y, and Yoshimoto, S

Published
2003
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