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Search Results: 1 - 10 of 1282 matches for " Masayuki Iwazaki "
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Safety of Landiolol Infusion in Patients Undergoing Lung Resection  [PDF]
Kenji Ito, Masahisa Nozaki, Reinii Sakamoto, Toshiyasu Suzuki, Ryota Masuda, Masayuki Iwazaki
Open Journal of Anesthesiology (OJAnes) , 2014, DOI: 10.4236/ojanes.2014.48026

The efficacy of landiolol hydrochloride, an ultrashort-acting b-blocker with high b1 selectivity, has been confirmed in patients undergoing cardiac surgery in Japan, but there have been few reports about its use for patients having lung resection. We investigated the safety of continuous infusion of landiolol in patients undergoing lung resection. Between May 2008 and May 2011, 200 patients scheduled for lung resection were enrolled. Patients who underwent surgery before the introduction of landiolol in February 2010 were studied retrospectively (Group C) and were compared with those who received landiolol along with surgery (Group L). During the 48-hour study period, the incidence of arrhythmias, changes in heart rate and blood pressure, and occurrence of adverse reactions were examined. The white blood cell count and C-reactive protein level were measured before and after surgery to assess the anti-inflammatory effect. The heart rate was significantly lower in Group L throughout the study period. No patient in Group L developed hypotension requiring discontinuation of landiolol therapy, and no respiratory symptoms (including asthma or hypoxemia) were observed. White blood cell and C-reactive protein were significantly increased after surgery in both groups, and there were no between-group differences. Arrhythmic events occurred in 1.1% (1/99) and 9.2% (7/76) of Group L and Group C, respectively. One patient in Group C developed ventricular tachycardia. Landiolol can be administered safely during the perioperative period in patients undergoing lung resection.

Two Dimensional Quantum Well of Gluons in Color Ferromagnetic Quark Matter
Iwazaki, Aiichi
High Energy Physics - Phenomenology , 2007,
Abstract: We have recently pointed out that color magnetic field is generated in dense quark matter, i.e. color ferromagnetic phase of quark matter. Using light cone quantization, we show that gluons occupying the lowest Landau level under the color magnetic field effectively form a two dimensional quantum well (layer), in which infinitely many zero modes of the gluons are present. We discuss that the zero modes of the gluons form a quantum Hall state by interacting repulsively with each other, just as electrons do in semiconductors. Such a ferromagnetic quark matter with the layer structure of the gluons is a possible origin of extremely strong magnetic field observed in magnetars.
Spontaneous Breakdown of U(1) symmetry in DLCQ without Zero Mode
Iwazaki, Aiichi
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.75.105009
Abstract: We show that the spontaneous breakdown of U(1) symmetry in a Higgs model can be described in discretized light cone formulation even by neglecting zero mode. We obtain correctly the energy of a ground state with the symmetry breakdown. We also show explicitly the presence of a Goldstone mode and its absence when the U(1) symmetry is gauged. In spite of obtaining the favorable results, we lose a merit in the formulation without zero modes that a naive Fock vacuum is the true ground state.
Josephson Effects in Double-Layer Quantum Hall States
Aiichi Iwazaki
Physics , 1998, DOI: 10.1142/S021798499800041X
Abstract: Under quite plausible assumptions on double-layer quantum Hall states with strong interlayer correlation, we show in general framwork that coherent tunneling of a single electron between two layers is possible. It yields Josephson effects with unit charge tunneling. The origin is that Halperin states in the quantum Hall states are highly degenerate in electron number difference between two layers in the absence of electrons tunneling.
Radiations from Axion Miniclusters and Axion Boson Stars in Galactic Magnetic Fields
Aiichi Iwazaki
Physics , 1997,
Abstract: The paper has been withdrawm. A completely new version on oscillating axionic boson stars will appear.
Radiations from Oscillating Axionic Boson Stars in an External Magnetic Field
Aiichi Iwazaki
Physics , 1998, DOI: 10.1016/S0370-2693(99)00209-9
Abstract: We solve numerically a field equation of axions coupled with gravity and show solutions representing oscillating axionic boson stars with small mass $\sim 10^{-12}M_{\odot}$ and large radius $\sim 10^{8}$ cm. We present explicitly a relation between the mass and the radius of the boson stars with such a small mass. These axionic boson stars are shown to possess oscillating electric currents in an external magnetic field and to radiate electromagnetic fields with a frequency given by mass of the axions. We estimate the luminosity of the radiation in a strong magnetic field $10^{12}$G of neutron stars, typically $\sim 10^{24}$ erg/s with the axion mass being $10^{-5}$eV.
Axionic Boson Stars in Magnetized Conducting Media
Aiichi Iwazaki
Physics , 1999, DOI: 10.1103/PhysRevD.60.025001
Abstract: Axions are possible candidates of dark matter in the present Universe. They have been argued to form axionic boson stars with small masses $10^{-14}M_{\odot}\sim 10^{-11}M_{\odot}$. Since they possess oscillating electric fields in a magnetic field, they dissipate their energies in magnetized conducting media such as white dwarfs or neutron stars. At the same time the oscillating electric fields generate a monochromatic radiation with energy equal to mass of the axion. We argue that the effect of the energy dissipation can be seen in the old white dwarfs. In particular, We show that colliding with sufficiently cooled white dwarfs, plausible candidates of MACHO, the axionic boson stars dissipate their energies in the dwarfs and heat up the dwarfs. Consequently the white dwarfs in the halo can emit detectable amount of thermal radiations with the collision. On the other hand, the monochromatic radiations can be seen only during the collision; a period of the dwarf passing the axionic boson star. Assuming that MACHO are dark white dwarfs, we show that there is a threshold in luminosity function of the white dwarfs below which the number of the white dwarfs in the halo increase discontinuously. The threshold in the luminosity function is expected to be located around $10^{-5.5}L_{\odot}\sim 10^{-7}L_{\odot}$. Its precise value is determined by the mass of the axionic boson stars dominant in the halo.
Axionic Boson Stars in Magnetized Conducting Media and Monochromatic Radiations
Aiichi Iwazaki
Physics , 1998,
Abstract: Axions have been argued to form coherent axionic boson stars as well as incoherent axion gas. These are ones of most plausible candidates of dark matters. Since the axionic boson stars generate oscillating electric fields in an external magnetic field, they induce oscillating currents in magnetized conducting media, which result in emitting radiations. We show that colliding with a magnetic white dwarf, an axionic boson star can emit a monochromatic radiation with a frequency given by a mass of the axion.
Ferromagnetic Domain Wall and Primeval Magnetic Field
Aiichi Iwazaki
Physics , 1996, DOI: 10.1103/PhysRevD.56.2435
Abstract: We show that coherent magnetic field is generated spontaneously when a large domain wall is created in the early universe. It is caused by two dimensional massless fermions bounded to the domain wall soliton. We point out that the magnetic field is a candidate of primordial magnetic field.
Ferromagnetism of Axion Domain Wall
Aiichi Iwazaki
Physics , 1997, DOI: 10.1016/S0370-2693(97)00696-5
Abstract: We show that axion domain wall is ferromagnetic in the universe with nonvanishing baryon number or lepton number. It is caused by protons and electrons bounded to the domain wall with their spins aligned. These bound states arise due to attractive potentials generated through pseudo-vector couplings between the fermions and the axion. Using a model of hadronic axions we predict existence of a primordial magnetic field with strength $10^{-13}$ Gauss at recombination.
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