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Gravitino problem in minimal supergravity inflation
Hasegawa, Fuminori,Mukaida, Kyohei,Nakayama, Kazunori,Terada, Takahiro,Yamada, Yusuke North-Holland Pub. Co 2017 Physics letters. Section B Vol.767 No.-
<P><B>Abstract</B></P> <P>We study non-thermal gravitino production in the minimal supergravity inflation. In this minimal model utilizing orthogonal nilpotent superfields, the particle spectrum includes only graviton, gravitino, inflaton, and goldstino. We find that a substantial fraction of the cosmic energy density can be transferred to the longitudinal gravitino due to non-trivial change of its sound speed. This implies either a breakdown of the effective theory after inflation or a serious gravitino problem.</P>
Saini, S,Takamura, M,Mukaida, M,Kim, S.-J IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>The <I>a</I>-axis oriented YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> thin films were grown on SrLaGaO<SUB>4</SUB> (100) substrate with a buffer layer of 50 nm thick Gd<SUB>2</SUB>CuO<SUB>4</SUB> using pulsed laser deposition technique. The thickness of Y-123 thin film was about 500 nm. Intrinsic Josephson junctions (CuO<SUB>2</SUB> planes) were aligned perpendicular to the substrate in the thin films. The bridge type pattern was fabricated using focused ion beam milling technique in such a way so that the current flow along the <I>c</I> -axis in thin film. The dimensions of bridge were 1 μm in length along the <I>c</I>-axis and 5 μm in width along the b-axis. The resistance vs. temperature characteristics showed transition temperature of about 89 K. The critical current density (J<SUB>c</SUB>) of 2×10<SUP>6</SUP> A/cm<SUP>2</SUP> was measured from current-voltage (I-V) characteristics at 10 K. The samples were irradiated with external microwave at 20 GHz and the J<SUB>c</SUB> was suppressed with increase in power. This suppression in J<SUB>c</SUB> indicates the formation of layered structure with strong coupling. The voltage steps were appeared with microwave irradiation in I-V characteristics. The values of voltage steps were irregular and change with increase in power. We have also studied all <I>a</I>-axis oriented multilayered thin films of YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Y123) and PrBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Pr123). We fabricated a submicron stack in which Josephson junctions were forming by Y123 and Pr123. The submicron stack showed response with microwave irradiation of different frequency and power. The transport characteristics of these thin films are discussed in detail.</P>
Saini, S.,Takamura, M.,Mukaida, M.,Kim, S.-J. Elsevier 2011 CURRENT APPLIED PHYSICS Vol.11 No.5
<P><B>Abstract</B></P><P>The thin film of <I>a</I>-axis oriented YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Y123) were grown on SrLaGaO<SUB>4</SUB> (100) substrate with a buffer layer of 50 nm thick Gd<SUB>2</SUB>CuO<SUB>4</SUB> using pulsed laser deposition technique. The thickness of Y123 thin film is about 400 nm CuO<SUB>2</SUB> planes are aligned perpendicular to the substrate in the thin films. A micron-bridge was fabricated using focused ion beam milling technique in such a way that the current was forced to flow along the <I>c</I>-axis in thin film. Intrinsic Josephson junctions are aligned along the <I>c</I>-axis. The dimensions of bridge are 1 μm in length along the <I>c</I>-axis and 5 μm in width along the <I>b</I>-axis. Transition temperature (<I>T<SUB>cON</SUB></I>) is about 84 K with single phase. The critical current density (<I>J<SUB>c</SUB></I>) of 2 × 10<SUP>6</SUP> A/cm<SUP>2</SUP> was measured from current–voltage (<I>I–V</I>) characteristics at 10 K. The samples were irradiated with external microwave of 20 GHz at different power and the <I>J<SUB>c</SUB></I> was suppressed as we increased the power. This suppression in <I>J<SUB>c</SUB></I> indicates the formation of layered structure with strong coupling. The voltage steps are appeared in non-linear <I>I–V</I> characteristics with microwave irradiation. The voltage steps are collective response of intrinsic Josephson junctions of micron-bridge.</P>
Microwave irradiation on a-axis oriented Y123/Pr123 two-stacked Josephson junctions device
S. Saini,P. Mele,M. Mukaida,김상재 한국물리학회 2015 Current Applied Physics Vol.15 No.5
Two-stacked submicron Josephson junctions devices were fabricated in a-axis oriented YBaCu3O7 and PrBa2Cu3O7 (Y123/Pr123) multi layered thin films using focused ion beam milling technique. The transition temperature and critical current density (Jc) of the device are about 83 K and 5 ×105 A/cm2 at 20 K, respectively. The device was irradiated with external microwave of 10 GHz and studied at 20 K. The microwave induced voltage steps are observed in I-V characteristics. The supercurrent branch become resistive above a certain microwave power and also the Jc was suppressed as we increased the microwave power. Magnetic field modulation of critical current shows periodicity of about 2000 gauss correspond to the Josephson junctions in the stack.
Development on a Coaxial Heat Integrated Distillation Column(HIDiC)
Noda, Hideo,Takamatsu, Takeichiro,Aso, Kazumasa,Naknishi, Tosinari,Yoshida, Kazufumi,Nakaiwa, Masaru,Mukaida, Tadahiro,Kuratani, Nobuyuki 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.5
Various configurations of a column for performing the principle of HIDiC can be proposed, but a coaxial column which is installed a packing in an inside tube and outer side may be one of the simplest columns for HIDiC. In order to examine whether or not the configuration of the packed column mentioned above is appropriate to HIDiC, an experimental apparatus has been set up and heat and mass transfer rates have been measured by using benzene-toluene system.
Seo, J Y,Yu, J-H,Lim, J W,Mukaida, N,Kim, H The Society 2009 Journal of physiology and pharmacology Vol.60 No.suppl7
<P>Inducible nitric oxide synthase (iNOS) and interleukin-8 (IL-8) mediate gastric inflammation. Nitric oxide (NO) produced by iNOS may activate oxidant-sensitive transcription factors. There are the binding sites for NF-kappaB, AP-1, and C/EBP (CCAAT/enhancer binding protein) in the promoter regions of IL-8 gene. The present study aims to investigate whether NO donors, SIN-1 and NOC-18, activate oxidant-sensitive transcription factors NF-kappaB and AP-1 as well as C/EBP to induce IL-8 expression in gastric epithelial AGS cells. Gastric epithelial AGS cells were treated with NO donors, SIN-1 and NOC-18. mRNA expression and protein level of IL-8 in the medium were determined. Nitrite level in the medium and DNA binding activities of NF-kappaB, AP-1, and C/EBP were assessed. NO donors induced the increase in the levels of IL-8 and nitrite in the medium as well as mRNA expression of IL-8 in AGS cells time-dependently. The induction of IL-8 by NO donors was accompanied with the activation of NF-kappaB and AP-1 but not C/EBP in AGS cells. Conclusion: Large amount of NO, which may be produced by iNOS, may induce the activation of NF-kappaB and AP-1 and the expression of IL-8 in gastric epithelial cells.</P>