Electronic phase diagram of the layered cobalt oxide system LixCoO2 (0.0 ≤ x ≤ 1.0) (2009)
Motohashi, T., Ono, T., Sugimoto, Y., Masubuchi, Y., Kikkawa, S., Kanno, R., ...
Here we report the magnetic properties of the layered cobalt oxide system, LixCoO2, in the whole range of Li composition, 0 ≤ x ≤ 1. Based on dc-magnetic-susceptibility data, combined with...
Electronic phase diagram of the layered cobalt oxide system, LixCoO2 (0.0 (2009)
Motohashi, T., Ono, T., Sugimoto, Y., Masubuchi, Y., Kikkawa, S., Kanno, R., ...
Here we report the magnetic properties of the layered cobalt oxide system, LixCoO2, in the whole range of Li composition, 0
Kawasaki, S., Motohashi, T., Shimada, K., Ono, T., Kanno, R., Karppinen, M., ...
CoO2 is the parent compound for the superconductor NaxCoO2\cdot1.3H2O and was widely believed to be a Mott insulator. We performed 59Co nuclear magnetic resonance (NMR) and nuclear quadrupole...
Oxygen ordering and mobility in YBaCo4O7+delta (2009)
Jia, Y., Jiang, Hua, Valkeapää, Mika, Yamauchi, H., Karppinen, Mikko, Kauppinen, Esko I.
Journal of the American Chemical Society Vol.131 Nr.13, 4880-4883
Motohashi, T., Ono, T., Katsumata, Y., Kanno, R., Karppinen, M., Yamauchi, H.
Single-phase bulk samples of the "exotic" CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na), were successfully synthesized through electrochemical de-intercalation of Li from pristine LiCoO2...
Photoproduction of neutral kaons on the liquid deuterium target in the threshold region (2007)
Tsukada, K., Takahashi, T., Watanabe, T., Fujii, Y., Futatsukawa, K., Hashimoto, O., ...
The photoproduction process of neutral kaons on a liquid deuterium target is investigated near the threshold region, Egamma = 0.8-1.1 GeV. K0 events are reconstructed from positive and negative...
Synthesis and properties of CoO2, the x = 0 end member of the LixCoO2 and NaxCoO2 systems (2007)
Motohashi, T., Katsumata, Y., Ono, T., Kanno, R., Karppinen, M., Yamauchi, H.
We report here the synthesis of single-phase bulk samples of CoO2, the x = 0 end member of the AxCoO2 systems (A = Li, Na), from a pristine LiCoO2 sample using an electrochemical technique to...
Photo-production of neutral kaons on 12C in the threshold region (2006)
Watanabe, T., Bydžovský, P., Dobashi, K., Endo, S., Fujii, Y., Hashimoto, O., ...
Kaon photo-production process on $^{12}$C has been studied by measuring neutral kaons in a photon energy range of 0.8$-$1.1 GeV. Neutral kaons were identified by the invariant mass constructed from...
The Parent of Misfit-Layered Cobalt Oxides: [Sr2O2]qCoO2 (2005)
Yamauchi, H., Sakai, K., Nagai, T., Matsui, Y., Karppinen, M.
Misfit-layered (ML) cobalt oxides of the general formula of [MmA2Om+2]qCoO2 have been proven to be efficient thermoelectric materials as the structure is capable in accommodating the two seemingly...
Visual Comput (2005) 21: 659–668 DOI 10.1007/s00371-005-0319-x ORIGINAL ARTICLE (2005)
Hitoshi Yamauchi, Stefan Gumhold, Rhaleb Zayer, Hans-peter Seidel, H. Yamauchi, S. Gumhold
The goal of surface mesh segmentation is to construct a covering of a given mesh, which is composed of surface patches, i.e., charts. There has been a considerable body of research devoted to this...
Room-temperature ferromagnetism in Sr_(1-x)Y_xCoO_(3-delta) (0.2 < x < 0.25) (2004)
Kobayashi, W., Ishiwata, S., Terasaki, I., Takano, M., Grigoraviciute, I., Yamauchi, H., ...
We have measured magnetic susceptibility and resistivity of Sr$_{1-x}$Y$_x$CoO$_{3-\delta}$ ($x=$ 0.1, 0.15, 0.2, 0.215, 0.225, 0.25, 0.3, and 0.4), and have found that...
Micro-structure and Magnetization of the 80-K Superconductor, TbSr2Cu2.7Mo0.3O7+d (2004)
Awana, V. P. S., Gupta, Anurag, Kishan, H., Karppinen, M., Yamauchi, H., Narlikar, A. V., ...
The results of micro-structural and detailed magnetization studies are reported here for our recently published TbSr2Cu2.7Mo0.3O7+d superconductor with a transition temperature (Tc) at as high as 80...
Nakane, T., Isawa, K., Liu, R. S., Chen, J. M., Yamauchi, H., Karppinen, M.
The effect of Sr(II)-for-Ba(II) isovalent substitution on the magnetic irreversibility field (Hirr) of Cu(Ba1-ySry)2YbCu2O6.95(2) (Cu-1212) sample series (y = 0 ~ 0.4) is studied to reveal guiding...
Oxygen and Cation Ordered Perovskite, Ba2Y2Mn4O11 (2004)
Karppinen, M., Okamoto, H., Fjellvag, H., Motohashi, T., Yamauchi, H.
A three-step route has been developed for the synthesis of a new oxygen-ordered double perovskite, BaYMn2O5.5 or Ba2Y2Mn4O11. (i) The A-site cation ordered perovskite, BaYMn2O5+d, is first...
Experimental investigation of variance-to-mean formula for periodic and pulsed neutron source (2004)
Kitamura, Y, Yamauchi, H, Yamane, Y, Misawa, T, Ichihara, C, Nakamura, H
Awana, V. P. S., Gupta, Anurag, Kishan, H., Malik, S. K., Yelon, W. B., Linden, J., ...
MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds, with M = Fe and Co, have been synthesized through a solid-state reaction route. Both compounds crystallize in a tetragonal structure (space group I4/mmm). A...
Shimada, T., Nakamura, J., Motohashi, T., Yamauchi, H., Karppinen, M.
Here we show that the B-site cation (Fe/Mo) ordering in the double-perovskite magnetoresistor, Sr2FeMoO6, is controlled by either kinetics or thermal equilibrium depending on the temperature range....
Iron and molybdenum valences in double-perovskite (Sr,Nd)2FeMoO6: electron-doping effect (2003)
Linden, J., Shimada, T., Motohashi, T., Yamauchi, H., Karppinen, M.
Double perovskite, (Sr1-xNdx)2FeMoO6, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 < x < 0.2). The Fe valence and the degree of B-site order were probed by...
Karppinen, M., Yamauchi, H., Yasukawa, Y., Linden, J., Chan, T. S., Liu, R. S., ...
Here we employ both Fe K and L2,3 edge x-ray absorption near-edge structure (XANES) spectroscopy techniques to clarify that iron in the B-site ordered double-perovskite halfmetal, Sr2FeMoO6.0,...
Enhanced thermoelectric properties of NaxCoO2 whisker crystals (2003)
Peleckis, G., Motohashi, T., Karppinen, M., Yamauchi, H.
Single-crystalline whiskers of thermoelectric cobalt oxide, NaxCoO2, have been grown by an unconventional method from potassium-containing compositions, and their transport properties, and chemical...
Iron valence in double-perovskite (Ba,Sr,Ca)2FeMoO6: Isovalent substitution effect (2003)
Yasukawa, Y., Karppinen, M., Linden, J., Chan, T. S., Liu, R. S., Yamauchi, H.
In the Fe-Mo based B-site ordered double-perovskite, A2FeMoO6.0, with iron in the mixed-valence II/III state, the valence value of Fe is not precisely fixed at 2.5 but may be fine-tuned by means of...
Superconductivity of up to 80 K for Tb-123 - TbSr2Cu2.7Mo0.3O7 (2003)
Awana, V. P. S., Kishan, H., Takayama-Muromachi, E., Watanabe, T., Karppinen, M., Yamauchi, H., ...
The Tb-123 phase has been synthesized in single-phase form with the composition TbSr2Cu2.7Mo0.3O7 by solid-state reaction route and its phase purity is confirmed by neutron powder diffraction...
Superconductivity in CoSr2(Y1-xCax)Cu2O7+d (2003)
Morita, Y., Yamauchi, H., Karppinen, M.
The roles of aliovalent Ca(II)-for-Y(III) substitution and high-pressure-oxygen annealing in the process of "superconducterizing" the Co-based layered copper oxide, CoSr2(Y1-xCax)Cu2O7+d (Co-1212),...
Sodium and oxygen nonstoichiometry and thermoelectric properties of NaxCoO2+d (2003)
Motohashi, T., Karppinen, M., Yamauchi, H.
The sodium-cobalt oxide NaxCoO2+d is a promising candidate for thermoelectric applications since it may possess simultaneously large thermoelectric power and low resistivity. It is difficult to...
Karppinen, M., Kotiranta, M., Nakane, T., Yamauchi, H., Chang, S. C., Liu, R. S., ...
Induction of holes not only in the superconductive CuO2 plane but also in the Bi2O2+d charge reservoir of the Bi2Sr2(Y1-xCax)Cu2O8+d superconductor upon CaII-for-YIII substitution is evidenced by...
Onset of quadrupole ordering at the structural phase transition in DyB2C2 (2003)
Tanaka, Y, Tabata, Y, Katsumata, K, Tamasaku, K, Ishikawa, T, Kawamura, N, ...
Engineering a customizable intermediate representation (2003)
K. Palacz, J. Baker, C. Flack, C. Grothoff, H. Yamauchi, J. Vitek
The Ovm framework is a set of tools and components for building language runtimes. We present the intermediate representation and software design patterns used throughout the framework. One of the...
Unconventional magnetic transition and transport behavior in Na0.75CoO2 (2002)
Motohashi, T., Ueda, R., Naujalis, E., Tojo, T., Terasaki, I., Atake, T., ...
Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide, NaxCoO2. Only for x = 0.75, a magnetic transition of the second order was clearly detected at Tm ~ 22 K...
Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10 (2002)
Awana, V. P. S., Takayama-Muromachi, E., Karppinen, M., Yamauchi, H.
Studied 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10 (Ru-1222) compound crystallized in a tetragonal I4/mmm space group crystal structure. Thermo-gravemetric (TG) analysis of the compound showed the...
Oxygen non-stoichiometry in Ru-1212 and Ru-1222 magnetosuperconductors (2002)
Matvejeff, M., Awana, V. P. S., Liu, R. S., Yamauchi, H., Karppinen, M.
Here we report the results of thermogravimetric (TG) analysis on the oxygen non-stoichiometry of RuSr2GdCu2O8 (Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222) samples. With TG annealings carried out...
Morita, Y., Awana, V. P. S., Yamauchi, H., Karppinen, M.
Here results of a systematic study on oxygen stoichiometry are reported for the first three members of the novel CoSr2(Y,Ce)sCu2O5+2s or Co-12s2 homologous series, i.e. Co-1212, Co-1222 and Co-1232...
Awana, V. P. S., Nakamura, J., Karppinen, M., Yamauchi, H., Malik, S. K.
Pr0.9Sr0.1CoO2.99 sample exhibits magnetoresistivity (MR) of up to 40 % at 5 K with a strong hysteresis/memory effect. Magnetisation measurements on Pr0.9Sr0.1CoO2.99 in an applied field of 100 Oe...
Awana, V. P. S., Karppinen, M., Yamauchi, H.
We reviewed our various results on rutheno-cuprate magneto-superconductors RuSr2GdCu2O8(Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222). It is observed, that it is difficult to control the oxygen...
Awana, V. P. S., Takayama-Muromachi, E., Malik, S. K., Yelon, W. B., Karppinen, M., Yamauchi, H.
Various MSr2YCu2Oz (M1212 with M = Fe, Co, Al and Ga) compounds have been synthesized through a solid state reaction route. All these compounds are derived from the basic CuBa2YCu2O7 structure....
Spin Glass Behavior in RuSr2Gd1.5Ce0.5Cu2O10 (2002)
Cardoso, C. A., Araujo-Moreira, F. M., Awana, V. P. S., Takayama-Muromachi, E., De Lima, O. F., Yamauchi, H., ...
The dynamics of the magnetic properties of polycrystalline RuSr2Gd1.5Ce0.5Cu2O10 (Ru-1222) have been studied by ac susceptibility and dc magnetization measurements, including relaxation and ageing...
Oxygen Content and Valence of Ru in RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222) Magnetosuperconductor (2002)
Awana, V. P. S., Karppinen, M., Yamauchi, H., Matvejeff, M., Liu, R. S.
The valence of Ru was analyzed for two RuSr2(Gd0.75Ce0.25)2Cu2O10 samples with different oxygen contents by Ru LIII edge x ray absorption near-edge structure (XANES) spectroscopy. For the sample...
Magnetization and heat capacity of R1/3Sr2/3FeO3-δ (R = La and Pr) (2001)
Awana, V. P. S., Karppinen, M., Yamauchi, H., Malik, S. K., Yelon, W. B., Mehta, A., ...
A highly flexible evaluation system for telecommunication analog front-ends (2001)
Bresch, M., Hammerschmidt, D., Hosticka, B.J., Kemmerling, M., Klein, B., Kokozinski, R., ...
As technological progress leads to increasing data transmission rates, use of digital transmission is inevitable. However, since analog waveforms are involved in digital transmission, analog...
A low-voltage low-power 0.25 µm CMOS ADSL analog front-end IC (2000)
Kokozinski, R., Bresch, M., Hammerschmidt, D., Hesener, M., Hosticka, B.J., Kemna, A., ...
A 0.12 µm 2.5V CMOS analog front-end IC for an ADSL system is presented. The IC contains all analog functions including gain-controlled transmit and receive amplifiers, highly linear continuous-time...
Preparation and Characterization of Radio-Frequency-Sputtered Ba2Si2TiO8 Thin Films. (1998)
Li, Yi, Kawa, P. M., Youdelis, W. V., Chao, B. S., Yamauchi, H.
Radio-frequency-sputtered barium titanium silicate (BST, Ba2Si2Ti8 thin films were grown on crystalline Si(100) substrates and were characterized using wavelength-dispersive spectrometry (WDS), X-ray...
Unconventional electron-phonon interaction and anharmonicity in superconducting cuprates (1996)
Egami, T, McQuenney, R J, Dmowski, W, Seiji, N, Yamauchi, H, Arai, M
Flying High : Liberalizing Civil Aviation in the Asia Pacific (1996)
Findlay, Christopher Charles, Hufbauer, G. C., Jaggi, G., Yamauchi, H., Ito, T., Kim, J., ...
Flying High : Liberalizing Civil Aviation in the Asia Pacific (1996)
Findlay, Christopher Charles, Hufbauer, G. C., Jaggi, G., Yamauchi, H., Ito, T., Kim, J., ...
Role of local lattice deformation in high temperature superconductivity (1995)
Egami, T, Dmowski, W, Sendyka, T R, McQueeney, R J, Seiji, N, Yamauchi, H, ...
Anharmonic Properties of High-Tc cuprates, Eds D Mihailovic, G Ruani, E Kaldis, K A Muller, (World Scientific) 118 (1995)
The role of surgical treatment for chronic pancreatitis.
Sato, T, Miyashita, E, Yamauchi, H, Matsuno, S
During the last 25 years, 134 patients with chronic pancreatitis were treated surgically in our clinic. According to intraoperative measurement of the pancreatic intraductal pressure, both perfusion...
The role of surgical treatment for chronic pancreatitis.
Sato, T, Miyashita, E, Yamauchi, H, Matsuno, S
During the last 25 years, 134 patients with chronic pancreatitis were treated surgically in our clinic. According to intraoperative measurement of the pancreatic intraductal pressure, both perfusion...
Involvement of apamin-sensitive K+ channels in antigen-induced spasm of guinea-pig isolated trachea.
Yamauchi, H., Miura, M., Ichinose, M., Ishikawa, J., Nakajima, N., Tomaki, M., ...
1. In order to examine whether K+ channels play a role in antigen-induced airway responses, the effect of K+ channel blockers on antigen-induced airway smooth muscle contraction and mediator release...
Angiotensin converting enzyme (ACE) inhibitor-induced cough and substance P.
Tomaki, M., Ichinose, M., Miura, M., Hirayama, Y., Kageyama, N., Yamauchi, H., ...
BACKGROUND: Angiotensin converting enzyme (ACE) inhibitors cause coughing in 5-10% of patients, but the exact mechanisms of this effect are still unclear. In the airways ACE degrades substance P so...
Yamauchi, H, Pagani, M, Fukuyama, H, Ouchi, Y, Nagahama, Y, Matsuzaki, S, ...
In cerebrovascular disease, progression of brain atrophy may reflect an increase in ischaemic changes. The purpose of this study was to determine whether atrophy of the corpus callosum progresses in...
Yamauchi, H, Fukuyama, H, Nagahama, Y, Nabatame, H, Nakamura, K, Yamamoto, Y, ...
OBJECTIVES--In major cerebral arterial occlusive diseases, patients with inadequate blood supply relative to metabolic demand (misery perfusion) may be at increased risk for cerebral ischaemia. This...
Yamauchi, H, Fukuyama, H, Dong, Y, Nabatame, H, Nagahama, Y, Nishizawa, S, ...
OBJECTIVES—It remains controversial whether selective neuronal ischaemic change develops in patients with occlusion of the large cerebral arteries. Previous studies have shown atrophy of the corpus...
Significance of white matter high intensity lesions as a predictor of stroke from arteriolosclerosis
Yamauchi, H, Fukuda, H, Oyanagi, C
Objectives: To determine whether the extent of white matter high intensity lesions (WML) on magnetic resonance imaging (MRI) is an independent predictor of risk for stroke from arteriolosclerosis,...
Pattern of collaterals, type of infarcts, and haemodynamic impairment in carotid artery occlusion
Yamauchi, H, Kudoh, T, Sugimoto, K, Takahashi, M, Kishibe, Y, Okazawa, H
Background: In internal carotid artery (ICA) occlusion, increased oxygen extraction fraction (OEF) indicates inadequate collateral blood flow distal to the occlusion, which may be caused by poor...
Oxygen extraction fraction and acetazolamide reactivity in symptomatic carotid artery disease
Yamauchi, H, Okazawa, H, Kishibe, Y, Sugimoto, K, Takahashi, M
Objective: It has been proposed that cerebral blood flow (CBF) response to acetazolamide may be reduced according to the degree of autoregulatory vasodilation in regions with normal oxygen extraction...
Yamauchi, H., Fukuyama, H., Nagahama, Y., Katsumi, Y., Hayashi, T., Oyanagi, C., ...
OBJECTIVES—The loss of the neurons in layer 3, one of the groups of cortical neurons most vulnerable in various degenerative brain diseases, results in axonal degeneration leading to atrophy of the...
Conservation economics of use-value land taxation is used to explain the intertemporal incentive effects of progressive versus regressive taxes on the stock and flow component of land into different...