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Volume 70, Issue 7
Displaying 1-22 of 22 articles from this issue
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Article type: Cover
2015 Volume 70 Issue 7 Pages Cover1-
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Tomi OhtsukiArticle type: Article
2015 Volume 70 Issue 7 Pages 505-
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Article type: Index
2015 Volume 70 Issue 7 Pages 506-507
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Yasuhiro SekinoArticle type: Article
2015 Volume 70 Issue 7 Pages 508-509
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Shin NakamuraArticle type: Article
2015 Volume 70 Issue 7 Pages 510-518
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSThe gauge/gravity duality is a map between a quantum gauge theory and a higher-dimensional gravity. The description of many-body dynamics of the gauge particles can be highly simplified in the gravity side through the duality. This advantage has been recently applied to describe the non-equilibrium non-linear phenomena, such as negative differential conductivity of the gauge theory. We overview how it works.View full abstractDownload PDF (4541K) -
Shin'ichi Ishiwata, Katsuhiko SatoArticle type: Article
2015 Volume 70 Issue 7 Pages 519-529
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSThe contractile system of striated muscle (skeletal and cardiac muscles) is a higher-ordered biological machine that generates the contractile force. It is usually considered that the contractile system of muscle takes either contraction or relaxation state, depending on the concentration of Ca^<2+>. However, we have found that there exists the third state, i.e., an auto-oscillatory state termed SPOC (Spontaneous Oscillatory Contraction), in which each sarcomere spontaneously oscillates showing a saw-tooth waveform composed of slow shortening and rapid lengthening phases, and the elongation phase is propagated to the adjacent sarcomeres in succession, one by one (SPOC wave). The SPOC state is realized at the intermediate activation conditions in between contraction and relaxation, which was demonstrated by constructing the three-dimensional state diagram showing contraction, relaxation, and SPOC states against the concentrations of Ca^<2+>, Pi (inorganic phosphate), and MgADP (adenosine di-phosphate) at the fixed concentration of MgATP (adenosine tri-phosphate). Here we describe the characteristics of SPOC obtained in our group and the theoretical model that can explain almost all the properties of SPOC observed not only in each sarcomere, but also in a myofibril as a whole. Finally, we discuss the possibility that the SPOC properties play an essential part in a heartbeat.View full abstractDownload PDF (9356K) -
Kiyoshi IshikawaArticle type: Article
2015 Volume 70 Issue 7 Pages 530-534
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSOptical pumping of atomic vapor provides hyperpolarization of alkali-metal salts. Laser irradiation induces electron and nuclear spin currents in the gas phase, spin transfer between gaseous atoms and condensed matter, injection of spin polarized carriers, and spin polarization transport in the materials. In this paper, spin injection optical pumping for cesium salts are performed by optical pumping of cesium vapor. The technique can be applied to a variety of different metal salts.View full abstractDownload PDF (868K) -
Satoshi Takeuchi, David Steppenbeck, Yutaka UtsunoArticle type: Article
2015 Volume 70 Issue 7 Pages 535-539
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSThe atomic nucleus is a finite quantum system composed of protons and neutrons. In a way similar to electrons in an atom, protons and neutrons in the nucleus exhibit shell structures. In the case of stable nuclei, which exist naturally in the Universe, large energy gaps persist between shells that fill when the proton or neutron number equals 2, 8, 20, 28, 50, 82 or 126. However, far from the line of β stability, these magic numbers can change in nuclei that contain a large excess of neutrons. While some of the traditional shell closures disappear, other new ones are known to present themselves. Here, we report on a study of the exotic nucleus ^<54>Ca using proton removal reactions from ^<55>Sc and ^<56>Ti projectiles at the RIKEN Radioactive Isotope Beam Factory. The results indicate a doubly magic structure for ^<54>Ca and, accordingly, provide the first experimental evidence for a new subshell closure at neutron number 34.View full abstractDownload PDF (3761K) -
Masashi Kimura, Hiroshi Tsunemi, Hiroshi TomidaArticle type: Article
2015 Volume 70 Issue 7 Pages 540-543
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSThe Monitor of All-sky X-ray Image (MAXI) is the first astronomical mission operated on the International Space Station. The solid-state slit camera (SSC) is X-ray CCDs which have been monitoring high temperature diffuse emission in our Galaxy. We confirmed the diffuse structure in the Cygnus region known as Cygnus superbubble (CSB) and analyzed its spectrum. As a result CSB is most likely a Hypernova remnant. Hypernova is an explosion of star which is 100 to 1,000 times larger than supernova. This is the first hypernova found in our Galaxy.View full abstractDownload PDF (7507K) -
Koichi Tsuchiya, Fanqiang Meng, Yoshihiko YokoyamaArticle type: Article
2015 Volume 70 Issue 7 Pages 544-548
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
JOURNAL FREE ACCESSEffect of high-pressure torsion (HPT) deformation on mechanical properties was investigated on Zr_<50>Cu_<40>Al_<10> bulk metallic glass by nanoindentation. HPT deformation resulted in the structural rejuvenation and pronounced decreases in hardness and elastic modulus. These changes were also accompanied by the transition of deformation mode from localized shear band formation to homogeneous deformation, as well as by a decrease in the frequency of pop-ins. Annealing of the deformed BMG led to the restoration of the localized deformation, hardness and elastic modulus; thus the transition is reversible. The observed reversible transition can be attributed to a change in the local atomic environment in the rejuvenated volume and the relaxed one.View full abstractDownload PDF (4424K) -
[in Japanese]Article type: Article
2015 Volume 70 Issue 7 Pages 549-551
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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[in Japanese]2015 Volume 70 Issue 7 Pages 552-562
Published: 2015
Released on J-STAGE: August 21, 2019
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[in Japanese]Article type: Article
2015 Volume 70 Issue 7 Pages 563-
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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[in Japanese]Article type: Article
2015 Volume 70 Issue 7 Pages 563-564
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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2015 Volume 70 Issue 7 Pages 564-565
Published: 2015
Released on J-STAGE: August 21, 2019
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[in Japanese]Article type: Article
2015 Volume 70 Issue 7 Pages 565-567
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...Article type: Article
2015 Volume 70 Issue 7 Pages 567-570
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Article type: Appendix
2015 Volume 70 Issue 7 Pages 571-573
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Article type: Appendix
2015 Volume 70 Issue 7 Pages 573-574
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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[in Japanese]2015 Volume 70 Issue 7 Pages 574-575
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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2015 Volume 70 Issue 7 Pages 576-582
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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Article type: Appendix
2015 Volume 70 Issue 7 Pages 583-584
Published: July 05, 2015
Released on J-STAGE: August 21, 2019
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