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Search Results: 1 - 10 of 2042 matches for " Kazuhiro Nomura "
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Phenomenological Aspects of a Direct-transmission Model of Dynamical Supersymmetry Breaking with the Gravitino Mass $m_{3/2} < 1~\KEV$
Yasunori Nomura,Kazuhiro Tobe
Physics , 1997, DOI: 10.1103/PhysRevD.58.055002
Abstract: We analyze a direct-transmission model of dynamical SUSY breaking previously proposed. In the model the gravitino mass is naturally smaller than $1~\KEV$, which is required from the standard cosmology. We find that there are many distinguishable features from in other models: for example the so-called GUT relation among the gaugino masses does not hold even if we consider the GUT models. Furthermore, the gauginos are always lighter than the sfermions since the gaugino masses have extra suppression factors. We also discuss a collider signature ``$\gamma \gamma +$ missing energy'' in the present model.
Classical and quantum radiation from a moving charge in an expanding universe
Hidenori Nomura,Misao Sasaki,Kazuhiro Yamamoto
Physics , 2006, DOI: 10.1088/1475-7516/2006/11/013
Abstract: We investigate photon emission from a moving particle in an expanding universe. This process is analogous to the radiation from an accelerated charge in the classical electromagnetic theory. Using the framework of quantum field theory in curved spacetime, we demonstrate that the Wentzel-Kramers-Brillouin (WKB) approximation leads to the Larmor formula for the rate of the radiation energy from a moving charge in an expanding universe. Using exactly solvable models in a radiation-dominated universe and in a Milne universe, we examine the validity of the WKB formula. It is shown that the quantum effect suppresses the radiation energy in comparison with the WKB formula.
Confronting the damping of the baryon acoustic oscillations with observation
Hidenori Nomura,Kazuhiro Yamamoto,Gert Huetsi,Takahiro Nishimichi
Physics , 2009, DOI: 10.1103/PhysRevD.79.063512
Abstract: We investigate the damping of the baryon acoustic oscillations in the matter power spectrum due to the quasinonlinear clustering and redshift-space distortions by confronting the models with the observations of the Sloan Digital Sky Survey luminous red galaxy sample. The chi-squared test suggests that the observed power spectrum is better matched by models with the damping of the baryon acoustic oscillations rather than the ones without the damping.
Purification and properties of S-hydroxymethylglutathione dehydrogenase of Paecilomyces variotii no. 5, a formaldehyde-degrading fungus
Ryohei Fukuda, Kazuhiro Nagahama, Kohsai Fukuda, Keisuke Ekino, Takuji Oka, Yoshiyuki Nomura
AMB Express , 2012, DOI: 10.1186/2191-0855-2-32
Nkx2.2+ Progenitors Generate Somatic Motoneurons in the Chick Spinal Cord
Hitoshi Gotoh, Katsuhiko Ono, Tadashi Nomura, Hirohide Takebayashi, Hidekiyo Harada, Harukazu Nakamura, Kazuhiro Ikenaka
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051581
Abstract: Heterogeneous classes of neurons are present in the spinal cord and are essential for its function. Expression patterns of transcription factors in neural progenitor cells determine neuron subtypes during development. Nkx2.2 is expressed in the progenitor cell pool located just ventrally to the Olig2-positive pool and is indispensable for V3 interneuron generation in the spinal cord and also for visceral motoneuron generation in the hindbrain. However, whether Nkx2.2-positive progenitor cells generate diverse classes of neuron is not fully understood. Using a chick lineage tracing method in a genetically-defined manner, we found that Nkx2.2-expressing progenitor cells differentiate into general visceral motoneurons as well as sim1-positive V3 interneurons. Surprisingly, we further observed that Nkx2.2-expressing progenitors differentiate into somatic motoneuron. Our findings suggest that the different classes of motoneurons are derived from more complex sources than were previously expected in the chick spinal cord.
Inflammatory Myofibroblastic Tumor of the Nasal Septum
Yuri Okumura,Kazuhiro Nomura,Takeshi Oshima,Atsuko Kasajima,Takahiro Suzuki,Eichi Ishida,Toshimitsu Kobayashi
Case Reports in Otolaryngology , 2013, DOI: 10.1155/2013/670105
Abstract: We report an extremely rare case of inflammatory myofibroblastic tumor of the posterior edge of the nasal septum. An 11-year-old boy presented with frequent epistaxis and nasal obstruction persisting for one year. Based on the clinical presentation and imaging studies, juvenile angiofibroma was suspected, but angiography suggested the possibility of another type of tumor. Transnasal endoscopic surgery found that the tumor protruded into the nasopharynx from the posterior end of the nasal septum. Histological examination identified spindle cells with immunoreaction for vimentin, smooth muscle actin, and anaplastic lymphoma kinase (ALK), but not for desmin and cytokeratin. This is a report of inflammatory myofibroblastic tumor mimicking juvenile angiofibroma. This case suggests that angiography is helpful in the differential diagnosis of epipharyngeal tumor in adolescence. 1. Introduction Inflammatory myofibroblastic tumor (IMT) was first observed in the lung in 1990 [1], but extrapulmonary IMTs have also since been reported. IMT is classified as myofibroblastic neoplasm with intermediate grade, which rarely metastasizes. The clinical presentation is a neoplastic process with recurrence and metastasis in some cases [2, 3]. IMT may occur throughout the body and is most commonly found in the lung, abdominal cavity, retroperitoneum, and extremities but is uncommon in the head and neck region [1, 4]. We present a case of IMT located in the nasopharynx, which mimicked juvenile angiofibroma. 2. Case Presentation An 11-year-old boy had visited a provincial hospital because of frequent epistaxis and nasal obstruction persisting for one year. A tumorous mass was found in the nasopharynx, so computed tomography (CT) and magnetic resonance (MR) imaging studies were performed. Juvenile angiofibroma was suspected, so he was referred to our hospital for further examination and treatment. Physical examination found a smooth reddish mass in the nasopharynx. The imaging studies performed at the previous hospital were reexamined. CT scans showed a homogeneously enhanced soft tissue mass in the nasopharynx without bone destruction (Figure 1). The T1-weighted MR image with contrast medium demonstrated an isointense mass with homogeneous enhancement (Figure 2). These findings elucidated the diagnostic impression of juvenile angiofibroma, as suggested by the previous physicians. Angiography detected faint tumor staining, but no obvious feeding artery (Figure 3). This result suggested the possibility of tumors other than juvenile angiofibroma because of the unexpectedly poor
Inventories and Mixed Duopoly with State-Owned and Labor-Managed Firms  [PDF]
Kazuhiro Ohnishi
iBusiness (IB) , 2010, DOI: 10.4236/ib.2010.22014
Abstract: This paper considers a two-period mixed market model in which a state-owned firm and a labor-managed firm are allowed to hold inventories as a strategic device. The paper then shows that the equilibrium in the second period occurs at the Stackelberg point where the state-owned firm is the leader.
Price-Setting Mixed Duopoly Models with Complementary Goods  [PDF]
Kazuhiro Ohnishi
Modern Economy (ME) , 2010, DOI: 10.4236/me.2010.11003
Abstract: This paper considers domestic (resp. international) Bertrand mixed duopoly competition in which a state-owned welfare-maximizing public firm and a domestic (resp. foreign) profit-maximizing private firm produce complementary goods. The main purpose of the paper is to present and to compare the equilibrium outcomes of the two mixed duopoly models.
Partial Privatization in Price-Setting Mixed Duopolies with Complementary Goods  [PDF]
Kazuhiro Ohnishi
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.21007
Abstract: We consider a domestic (resp. international) mixed duopoly model in which a domestic public firm and a domestic (resp. foreign) private firm produce complementary goods. First, the domestic government chooses the level of privatization to maximize domestic social welfare. Second, observing the level of privatization, the firms simultaneously and independently choose prices. We present the equilibrium outcomes of the two mixed duopoly models and shows that our result is in marked contrast to that of the price-setting mixed du-opoly model with substitute goods.
Labor Investment in a New International Mixed Market  [PDF]
Kazuhiro Ohnishi
Technology and Investment (TI) , 2010, DOI: 10.4236/ti.2010.12017
Abstract: This paper considers a continuous-time dynamic mixed market model of labor investment decisions of a domestic public firm and a foreign private firm. The paper studies the optimal levels of preemptive investment for the long-run structure of the international mixed market. It is then demonstrated that there are no perfect equilibria in which neither firm invests to its steady-state reaction curve.
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