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New Method to Measure the Rise Time of a Fast Pulse Slicer for Laser Ion Acceleration Research
Mori, Michiaki,Yogo, Akifumi,Kiriyama, Hiromitsu,Nishiuchi, Mamiko,Ogura, Koichi,Orimo, Satoshi,Ma, Jinglong,Sagisaka, Akito,Kanazawa, Shuhei,Kondo, Shuji,Nakai, Yoshiki,Akutsu, Atsushi,Yamamoto, Yoic IEEE 2008 IEEE transactions on plasma science Vol.36 No.4
<P> A dependence of cutoff proton kinetic energy on laser prepulse duration has been observed. Amplified spontaneous emission pedestal duration is controlled by a fast electrooptic pulse slicer where the rise time is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this rise time using a stretched frequency-chirped pulse. </P>
A Two-Dimensional Study of Transonic Flow Characteristics in Steam Control Valve for Power Plant
Yonezawa, Koichi,Terachi, Yoshinori,Nakajima, Toru,Tsujimoto, Yoshinobu,Tezuka, Kenichi,Mori, Michitsugu,Morita, Ryo,Inada, Fumio Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.1
A steam control valve is used to control the flow from the steam generator to the steam turbine in thermal and nuclear power plants. During startup and shutdown of the plant, the steam control valve is operated under a partial flow conditions. In such conditions, the valve opening is small and the pressure deference across the valve is large. As a result, the flow downstream of the valve is composed of separated unsteady transonic jets. Such flow patterns often cause undesirable large unsteady fluid force on the valve head and downstream pipe system. In the present study, various flow patterns are investigated in order to understand the characteristics of the unsteady flow around the valve. Experiments are carried out with simplified two-dimensional valve models. Two-dimensional unsteady flow simulations are conducted in order to understand the experimental results in detail. Scale effects on the flow characteristics are also examined. Results show three types of oscillating flow pattern and three types of static flow patterns.
Shun Sawatsubashi,Koichi Nishimura,Jinichi Mori,Alexander Kouzmenko,Shigeaki Kato 대한골대사학회 2019 대한골대사학회지 Vol.26 No.1
Vitamin D (VD) is essential for bone health, and VD or its analogues are widely used in clinics to ameliorate bone loss. The targets and mode of VD anti-osteoporotic actions appear to be different from those of other classes of drugs modulating bone remodeling. VD exerts its biological activities through the nuclear VD receptor (VDR)-mediated transcriptional regulation of target mRNA and non-coding RNA genes. VD-induced gene regulation involves epigenetic modifications of chromatin conformation at the target loci as well as reconfiguration of higher-order chromosomal organization through VDR-mediated recruitment of various regulatory factors. Enhancer RNAs (eRNA), a class of non-coding enhancer-derived RNAs, have recently emerged as VDR target gene candidates that act through reorganization of chromatin looping to induce enhancer-promoter interaction in activation of mRNA-encoding genes. This review outlines the molecular mechanisms of VD actions mediated by the VDR and suggests novel function of eRNAs in VDR transactivation.
Boxun Wu,Koichi Ito,Naomichi Mori,Tetsuo Oya,Tom Taylor,Jun Yanagimoto 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.2
In this study, an anisotropic constitutive model based on the non-associated flow rule was developed for anisotropic sheet metals. This model was defined in the quadratic form of the Hill’s anisotropic function under a general three-dimensional stress condition. The anisotropic parameters for the yield function were identified using the directional planar yield stresses, bulge yield stress and shear yield stress, while those for the plastic potential function were identified using the directional r-values. A full expression related to the non-associated flow rule was applied and the model was implemented into the finite element code ABAQUS. A static-implicit analysis and the solid element were applied. Capability of the developed model for predicting the anisotropic behavior of sheet metal was investigated by considering two different sheet metal forming processes: cylindrical cup drawing of AA2090-T3, A6061P-T6 and SPCE; and hole expansion forming test of A6016-O. Cup heights and through-thickness strain distributions obtained from the simulations were compared with the experimental data. Results demonstrate that the developed material model considering 3D condition can improve accuracy of predicting the anisotropic behaviors. Furthermore, the simple formulations are efficient and user-friendly for computational analyses and solving the common industrial sheet metal forming problems.
Takuya Misugi,Takashi Juri,Koichi Suehiro,Kohei Kitada,Yasushi Kurihara,Mie Tahara,Akihiro Hamuro,Akemi Nakano,Masayasu Koyama,Takasi Mori,Daisuke Tachibana 대한산부인과학회 2022 Obstetrics & Gynecology Science Vol.65 No.4
ObjectiveThis study aimed to investigate the accuracy and precision of continuous, non-invasive blood pressure obtained usingthe ClearSight system by comparing it with invasive arterial blood pressure, and to assess the hemodynamic changesusing invasive methods and the ClearSight system in patients undergoing cesarean section. MethodsArterial pressure was measured invasively with an intra-arterial catheter and non-invasively using the ClearSightsystem during cesarean section in patients with placenta previa or placenta accreta. Blood pressure measurementsobtained using these two means were then compared. ResultsTotal 1,277 blood pressure measurement pairs were collected from 21 patients. Under Bland-Altman analysis, theClearSight system demonstrated an acceptable accuracy with a bias and standard deviation of 8.8±13.4 mmHg forsystolic blood pressure, -6.3±7.1 mmHg for diastolic blood pressure, and -2.7±8.0 mmHg for median blood pressure. Cardiac index levels were significantly elevated during fetal delivery and 5 minutes after placental removal, andsystemic vascular resistance index levels were significantly decreased during fetal delivery and 40 minutes afterplacental removal. ConclusionIn patients undergoing cesarean section, the ClearSight system showed excellent accuracy and precision compared tothat of the currently used invasive monitoring system. 영어
Effect of Clearance between Two-Body on Heat Flux in Hypersonic Compression Ramp
Hiroshi Ozawa,Hironao Yokoi,Koichi Mori,Yoshiaki Nakamura 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
The hypersonic flow over a compression ramp is one of the most important problems, where various phenomena occur, such as shock/shock interaction, shock boundary layer interaction, and reattachment of separated boundary layer. Consequently, heat flux and pressure around the corner become high. Actually these phenomena appear in the body flap and wing root of space shuttle. Furthermore, a severe problem such as Columbia takes place when these interactions occur in a crack, as a result of thermal protection tiles damage. The objective of the present study is to experimentally investigate heat flux near the corner of a compression ramp at hypersonic speed. The present two-dimensional compression ramp is consisted of two flat plates. Hence the flow-field is assumed to be nearly two-dimensional. The deflection angle of the corner is fixed at 30 deg. All experiments were performed in the shock tunnel of Nagoya University. The diameter of the nozzle exit is 350㎜, which can produce a hypersonic flow with a Mach number of8.1, where the duration is 50msec. The unit Reynolds number is Re=6.5x10?m?¹. In addition, the effect of the clearance h between the two bodies on the flow-field is examined by measuring distributions of the heat flux. From shclieren images. the flow-field can be classified into two patterns. In the case of no clearance (h/L=0.00), the shear layer generated from upstream of the corner reattaches on the ramp, where heat flux rises in the downstream of the reattachment region. The heat flux is almost same as the stagnation heat flux. In the case of small clearance (h/L=0.025), the reattachment point moves upstream of the ramp, although the large separation region does not change. In the case of a large clearance (h/L=0.050). the separated boundary layer does not reattach on the ramp, and goes into the clearance.
BALDUCCI-SILANO, PINA L.,SUZUKI, KOICHI,OHTA, MASANORI,SAITO, JUN,OHMORI, MASAYUKI,MONTANI, VALERIA,NAPOLITANO, GIORGIO,SHONG, MINHO,TANIGUCHI, SHIN-ICHI,PIETRARELLI, MICHELE,LAVARONI, STEFANO,MORI, A 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-
The single strand binding protein (SSBP-1) is a positive regulator of TSH receptor gene expression and binds to an element with a GXXXXG motif. The S box of the mouse major histocompatibility classⅡ gene has multiple GXXXXG motifs and can also bind SSBP-1. The S box is one of four highly conserved elements on the 5'-flanking region of classⅡ genes that are necessary for interferon-γ (IFNγ) to overcome the normally suppressed state of the gene and induce aberrant classⅡ expression. In this report we show that SSBP-1, when overexpressed in FRTL-5 thyroid cells, is a positive regulator of human leukocyte antigen (HLA)-DRα classⅡ gene expression, as is IFNγ or the classⅡ trans-activator (CIITA). This is evidenced by increased exogenous promoter activity, increased endogenous RNA levels, and increased endogenous antigen expression after transfecting full-length SSBP-1 complementary DNA together with a HLA-DRα promoter-reporter gene chimera into TSH-treated FRTL-5 thyroid cells whose endogenous SSBP-1 levels are low. IFNγ reverses the ability of TSH to decrease endogenous SSBP-1 RNA levels. Also, whereas SSBP-1 transfection does not cause any increase in IFNγ-induced exogenous promoter activity, transfection of SSBP-1 and CIITA additively increases endogenous classⅡ RNA levels to levels measured in cells treated with IFNγ. Further, competition studies show that SSBP-1 binding is necessary for formation of the double strand protein/DNA complexes that are seen in electrophoretic mobility shift assays when the classⅡ 5'-flanking region is incubated with extracts from IFNγ-treated FRTL-5 cells and that have been previously associated with IFNγ-induced aberrant classⅡ expression. These data suggest that SSBP-1 is involved in the action of IFNγ to overcome the normally suppressed state of the classⅡ gene; it functions together with CIITA, whose expression is independently increased by IFNγ. The effect of SSBP-1 as a positive regulator of classⅡ promoter activity is lost in cells maintained without TSH, in which endogenous SSBP-1 RNA levels are already high in the absence of aberrant classⅡ gene expression. These data suggest that high levels of endogenous SSBP-1 are insufficient to cause aberrant classⅡ expression, but, rather, TSH or IFNγ treatment additionally modulates the cell, albeit differently, such that transfected or endogenous SSBP-1, respectively, can express its positive regulatory activity. The effect of TSH is consistent with reports indicating that TSH enhances the ability of IFNγ to increase classⅡ gene expression despite the fact IFNγ increases endogenous SSBP-1 to only the same levels as in cells untreated with TSH. Finally, the effect of SSBP-1 as a positive regulator is lost when GXXXXG motifs, which exist on both the coding and noncoding strands of the S box, are mutated. Consistent with this, mutation and oligonucleotide competition studies show that GXXXXG motifs are necessary for either strand of the S box to bind protein/DNA complexes containing SSBP-1 in FRTL-5 cell extracts or to bind to recombinant SSBP-1. They also suggest that the SSBP-1-binding sites on either strand of the HLA-DRα S box are functionally distinct. We conclude from these data that the positive regulatory action of SSBP-1 on classⅡ gene expression involves GXXXXG motifs on each strand of the highly conserved S box of the classⅡ 5'-flanking region. As SSBP-1 is modulated by IFNγ and is involved in classⅠ and TSH receptor as well as classⅡ gene expression in FRTL-5 cells, the sum of the data supports the hypotheses that common transcription factors regulate all three genes, and their altered activities may contribute to the development of autoimmunity. (Endocrinology 139: 2300-2313, 1998)
A Triple Squealer For Axial Flow Turbines
By Mohamed El-Ghandour,M. K. Ibrahim,Koichi Mori,Yoshiaki Nakamura 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
In this paper a new blade tip shape, triple squealer, has been proposed. This shape is based on the conventional double squealer, and the cavity on the tip surface is divided into two parts by using a third squealer along the blade camber line. Four cases for the ratio of groove depth to span (GDS ratio): 0.75%, 1.5%,2.25%, and 3%, which correspond to 50%, 100%, 150%, and 200% of the tip clearance to span ratio, respectively, were taken up to investigate the effects of the GDS ratio on the flow field and losses. The flat tip case (baseline case) and the double squealer case were also calculated for comparison. The in-house, unstructured, 3D, Navier-Stokes, finite volume, multiblock code with DES (Detached Eddy Simulation) as turbulence model was used to calculate the flow field. It was found from calculated results that reduction in the mass flow rate of leakage flow in the case of a triple squealer with a GDS ratio of 1.5% is 8 times that for the double squealer case.