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Watanabe, H.,Zhang, G.X.,Yoshida, K.,Walker, P.M.,Liu, J.J.,Wu, J.,Regan, P.H.,Soderstrom, P.A.,Kanaoka, H.,Korkulu, Z.,Lee, P.S.,Nishimura, S.,Yagi, A.,Ahn, D.S.,Alharbi, T.,Baba, H.,Browne, F.,Bruce North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
The level structure of <SUP>172</SUP>Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a <SUP>238</SUP>U beam. A long-lived isomeric state with T<SUB>½</SUB>=0.71(5) s and K<SUP>π</SUP>=8<SUP>-</SUP> has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus <SUP>172</SUP>Ho via allowed β decays. The robust nature of the K<SUP>π</SUP>=8<SUP>-</SUP> isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.
Heterointerface effects in the electrointercalation of van der Waals heterostructures
Bediako, D. Kwabena,Rezaee, Mehdi,Yoo, Hyobin,Larson, Daniel T.,Zhao, S. Y. Frank,Taniguchi, Takashi,Watanabe, Kenji,Brower-Thomas, Tina L.,Kaxiras, Efthimios,Kim, Philip Nature Publishing Group UK 2018 Nature Vol.558 No.7710
Molecular-scale manipulation of electronic and ionic charge accumulation in materials is the backbone of electrochemical energy storage<SUP>1–4</SUP>. Layered van der Waals (vdW) crystals are a diverse family of materials into which mobile ions can electrochemically intercalate into the interlamellar gaps of the host atomic lattice<SUP>5,6</SUP>. The structural diversity of such materials enables the interfacial properties of composites to be optimized to improve ion intercalation for energy storage and electronic devices<SUP>7–12</SUP>. However, the ability of heterolayers to modify intercalation reactions, and their role at the atomic level, are yet to be elucidated. Here we demonstrate the electrointercalation of lithium at the level of individual atomic interfaces of dissimilar vdW layers. Electrochemical devices based on vdW heterostructures<SUP> 13</SUP> of stacked hexagonal boron nitride, graphene and molybdenum dichalcogenide (MoX<SUB>2</SUB>; X = S, Se) layers are constructed. We use transmission electron microscopy, in situ magnetoresistance and optical spectroscopy techniques, as well as low-temperature quantum magneto-oscillation measurements and ab initio calculations, to resolve the intermediate stages of lithium intercalation at heterointerfaces. The formation of vdW heterointerfaces between graphene and MoX<SUB>2</SUB> results in a more than tenfold greater accumulation of charge in MoX<SUB>2</SUB> when compared to MoX<SUB>2</SUB>/MoX<SUB>2</SUB> homointerfaces, while enforcing a more negative intercalation potential than that of bulk MoX<SUB>2</SUB> by at least 0.5 V. Beyond energy storage, our combined experimental and computational methodology for manipulating and characterizing the electrochemical behaviour of layered systems opens new pathways to control the charge density in two-dimensional electronic and optoelectronic devices.
Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v
Kuroda, D.,Ishiguro, M.,Takato, N.,Hasegawa, S.,Abe, M.,Tsuda, Y.,Sugita, S.,Usui, F.,Hattori, T.,Iwata, I.,Imanishi, M.,Terada, H.,Choi, Y.-J.,Watanabe, S.-i.,Yoshikawa, M. Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
SIMULTANEOUS REMOVAL OF PHENOL, PVA AND AMMONIA
Bang,D. Y.,Watanabe, Y. 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.13 No.1
This paper concerns simultaneous nitrification and denitrification in a completely mixed bio-reactor with partially and fully submerged rotating biological contractors. The bio-reactor is designed to cause the nitrification and denitrification in partially and fully submerged biofilms, respectively. An experimental investigation was made into the effect of organic material and ratio of influent organic carbon to ammonia nitrogen concentrations(C/N ratio) on the efficiency of simultaneous nitrification and denitrification in the bio-reactor. Settled municipal wastewater and synthetic wastewater containing ammonia nitrogen and organic material such as acetate, ethylene-gly-col, phenol and poly-vinyl-alcohol(PVA) were fed into the experimental units. A biofilm dominated by nitrifiers developed on the partially submerged contactors, while a biofilm dominated by heterotrophs developed on the fully submerged contactors. A micro-aerobic environment was formed and biological denitrification occurred in the submerged biofilm. In the municipal wastewater treatment where the influent C/N ratio was around 3.5, the maximum nitrogen removal efficiency was about 60%. Acetate and ethlene-glycol were effectively used as the organic source of the denitrification. The ability to aerobically degrade PVA was induced by phenol. Once the bacteria inhibiting the biofilm gained the ability to degrade PVA, PVA become an effective organic source of the denitrification.
High-statistics study ofηπ0production in two-photon collisions
Uehara, S.,Watanabe, Y.,Nakazawa, H.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Bakich, A. M.,Belous, K.,Bondar, A.,Brad,ko, M.,Browder, T. E.,Chang, P.,Chen, A.,Cheon, B. G.,Chistov, R.,C American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.3
Study ofπ0pair production in single-tag two-photon collisions
Masuda, M.,Uehara, S.,Watanabe, Y.,Nakazawa, H.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behe American Physical Society 2016 Physical Review D Vol.93 No.3
<P>We report a measurement of the differential cross section of pi(0) pair production in single-tag two-photon collisions, gamma*gamma -> pi(0) pi(0), in e(+) e(-) scattering. The cross section is measured for Q(2) up to 30 GeV2, where Q(2) is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and vertical bar cos theta*vertical bar < 1.0 for the total energy and pion scattering angle, respectively, in the gamma*gamma center-of-mass system. The results are based on a data sample of 759 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The transition form factor of the f(0)(980) and that of the f(2)(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.</P>
Study of KS0 pair production in single-tag two-photon collisions
Masuda, M.,Uehara, S.,Watanabe, Y.,Adachi, I.,Ahn, J. K.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bansal, V.,Behera, P.,Berger, M.,Bhardw American Physical Society 2018 Physical Review D Vol.97 No.5
Luminescence and defect centres in MgSrAl<sub>10</sub>O<sub>17</sub>:Sm<sup>3+</sup> phosphor
Singh, Vijay,Watanabe, S.,Gundu Rao, T.K.,Chubaci, J.F.D,Kwak, Ho-Young Elsevier 2010 Journal of non-crystalline solids Vol.356 No.23
<P><B>Abstract</B></P><P>An efficient reddish orange emission MgSrAl<SUB>10</SUB>O<SUB>17</SUB>:Sm<SUP>3+</SUP> phosphor was prepared by the combustion method. The phosphor has been characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis measurements. Photoluminescence spectrum revealed that samarium ions are present in trivalent oxidation states. The phosphor exhibits two thermally stimulated luminescence (TSL) peaks at 210°C and 450°C. Electron spin resonance studies were carried out to identify the defect centres responsible for the TSL process in MgSrAl<SUB>10</SUB>O<SUB>17</SUB>:Sm<SUP>3+</SUP> phosphor. Three defect centres have been identified in irradiated phosphor and these centres are tentatively assigned to an O<SUP>−</SUP> ion and F<SUP>+</SUP> centres. O<SUP>−</SUP> ion (hole centre) correlates with the 210°C TSL peak while one of the F<SUP>+</SUP> centres (electron centre) appears to relate to the 450°C TSL peak.</P>