243 results on '"Kenji Hasegawa"'
Search Results
102. Progress of textile machinery. From productivity pursuit to ecology age response.( Part two ). Weaving machines
- Author
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Kenji Hasegawa
- Subjects
Engineering ,Textile ,Polymers and Plastics ,Natural resource economics ,business.industry ,Materials Science (miscellaneous) ,Ecology (disciplines) ,business ,Weaving ,Productivity ,Industrial engineering ,Industrial and Manufacturing Engineering - Published
- 1997
103. Competitive Sports and Precision Engineering. A Movement Analysis of the Alpineski and the Skiing Robot
- Author
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Kenji Hasegawa
- Subjects
Movement analysis ,Precision engineering ,Computer science ,Mechanical Engineering ,Robot ,Automotive engineering - Published
- 1997
104. INTERNAL HERNIA DURING PREGNANCY DUE TO ANOMALOUS OPENING IN THE FALCIFORM LIGAMENT
- Author
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Atsushi Imamura, Uetsuji S, Hiroyuki Nakamoto, Tomoo Kamiya, Hisanao Komada, Souichirou Takai, Yasuo Kamiyama, Masanori Kwon, Kousuke Matsui, and Kenji Hasegawa
- Subjects
Internal hernia ,Pregnancy ,medicine.medical_specialty ,business.industry ,education ,Abdominal cavity ,medicine.disease ,Surgery ,Bowel obstruction ,medicine.anatomical_structure ,medicine ,Ligament ,Gestation ,Falciform ligament ,Complication ,business - Abstract
Intestinal obstruction is a rare complication during pregnancy, and almost all causes are considered to be secondary adhesions in a patient with a surgical history. During pregnancy, there have been only a few reported cases of internal hernia. An internal hernia is formed by the protrusion of a viscus through a peritoneal fossae or anomalous opening in the mesentery leading to its encapsulation within a compartment of the abdominal cavity. The difficulty of diagnosis of the disease associated with pregnancy which limits diagnostic investigation also brings a dangerous combination of bowel obstruction. We present a case of internal hernia caused by anomalous opening in the falciform ligament in a pregnant woman of the 37th week of gestation. She underwent a cesarean section, followed by lapalotomy which revealed intestinal obstruction through the opening in the ligament falciform. The ligament was divided and 40cm of the small intestine was resected. In patients with symptoms suggestive of bowel obstruction during pregnancy, internal hernia must be included in the probable differential diagnoses.
- Published
- 1997
105. Utilization of Hyper Environments for Tracking and Monitoring of Processes and Supplies in Construction and Assembly Industries
- Author
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Andre Nunez, Greyce N. Schroeder, Rafael dos Santos, Eduardo Kenji Hasegawa de Freitas, Ricardo Sole Rocha, Marcos Bichet, and Silvia Silva da Costa Botelho
- Subjects
Engineering ,Supply chain management ,business.industry ,Systems engineering ,The Internet ,Solid modeling ,Shipyard ,Virtual reality ,business ,Track and trace ,Track (rail transport) ,Manufacturing engineering ,Visualization - Abstract
This article addresses the utilization of hyper environments and RFID to track and trace processes and supplies in construction and assembly industries, using networks of sensors/actuators and virtual reality. The concept and tools for development and implementation of hyper environments a represented applied in a study case: shipyard construction for assembly of maritime ships and platforms. In this scenario is used a network of sensors and RFIDs to track management of objects and supplies.
- Published
- 2013
106. Modelling of Lyman-alpha emitting galaxies and ionized bubbles at the epoch of reionization.
- Author
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Hidenobu Yajima, Kazuyuki Sugimura, and Kenji Hasegawa
- Subjects
STELLAR evolution ,STAR formation ,GALAXIES ,OPTICAL properties ,LUMINOSITY distance - Abstract
Understanding Lyα emitting galaxies (LAEs) can be a key to reveal cosmic reionization and galaxy formation in the early Universe. Based on halo merger trees and Lyα radiation transfer calculations, we model redshift evolution of LAEs and their observational properties at z ≥ 6. We consider ionized bubbles associated with individual LAEs and IGM (integer-galactic medium) transmission of Lyα photons. We find that Lyα luminosity tightly correlates with halo mass and stellar mass, while the relation with star formation rate has a large dispersion. Comparing our models with the observed luminosity function by Konno et al., we suggest that LAEs at z ~ 7 have galactic wind of V
out ... 100 kms-1 and HI column density of NHI 1020 cm-2 . Number density of bright LAEs rapidly decreases as redshift increases, due to both lower star formation rate and smaller HII bubbles. Our model predicts future wide deep surveys with next-generation telescopes, such as James Webb Space Telescope, European Extremely Large Telescope, and ThirtyMetre Telescope, can detect LAEs at z~10 with a number density of nLAE ~ a few x 10-6 Mpc-3 for the ?ux sensitivity of 10-18 erg cm-2 S-1 . When giant HII bubbles are formed by clustering LAEs, the number density of observable LAEs can increase by a factor of few. By combining these surveys with future 21-cm observations, it could be possible to detect both LAEs with LLyα ... 1042 erg s-1 and their associated giant HII bubbles with the size ... 250 kpc at z ~ 10. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
107. SEURAT: SPH scheme extended with ultraviolet line radiative transfer.
- Author
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Makito Abe, Hiroyuki Suzuki, Kenji Hasegawa, Semelin, Benoit, Hidenobu Yajima, and Masayuki Umemura
- Subjects
HYDRODYNAMICS ,RADIATIVE transfer ,ULTRAVIOLET radiation ,SCATTERING (Physics) ,MONTE Carlo method ,PHOTONS - Abstract
We present a novel Lyman alpha (Lyα) radiative transfer code, SEURAT (SPH scheme Extended with Ultraviolet line RAdiative Transfer), where line scatterings are solved adaptively with the resolution of the smoothed particle hydrodynamics (SPH). The radiative transfer method implemented in SEURAT is based on a Monte Carlo algorithm in which the scattering and absorption by dust are also incorporated. We perform standard test calculations to verify the validity of the code; (i) emergent spectra from a static uniform sphere, (ii) emergent spectra from an expanding uniform sphere, and (iii) escape fraction from a dusty slab. Thereby, we demonstrate that our code solves the Lyα radiative transfer with sufficient accuracy. We emphasize that SEURAT can treat the transfer of Lyα photons even in highly complex systems that have significantly inhomogeneous density fields. The high adaptivity of SEURAT is desirable to solve the propagation of Lyα photons in the interstellar medium of young star-forming galaxies like Lyα emitters (LAEs). Thus, SEURAT provides a powerful tool to model the emergent spectra of Lyα emission, which can be compared to the observations of LAEs. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
108. Diversity of the Lyman continuum escape fractions of high-z galaxies and its origins.
- Author
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Takumi Sumida, Daichi Kashino, and Kenji Hasegawa
- Subjects
GALACTIC evolution ,DISKS (Astrophysics) ,GALACTIC redshift ,GALACTIC magnitudes ,PHOTONS - Abstract
The Lyman continuum (LyC) escape fraction is a key quantity to determine the contribution of galaxies to cosmic reionization. It has been known that the escape fractions estimated by observations and numerical simulations show a large diversity. However, the origins of the diversity are still uncertain. In this work, to understand what quantities of galaxies are responsible for controlling the escape fraction, we numerically evaluate the escape fraction by performing ray-tracing calculation with simplified disc galaxy models.With a smooth disc model, we explore the dependence of the escape fraction on the disposition of ionizing sources and find that the escape fraction varies up to ∼3 orders of magnitude. It is also found that the halo mass dependence of disc scale height determines whether the escape fraction increases or decreases with halo mass. With a clumpy disc model, it turns out that the escape fraction increases as the clump mass fraction increases because the density in the inter-clump region decreases. In addition, we find that clumpiness regulates the escape fraction via two ways when the total clump mass dominates the total gas mass; the escape fraction is controlled by the covering factor of clumps if the clumps are dense sufficient to block LyC photons, otherwise the clumpiness works to reduce the escape fraction by increasing the total number of recombination events in a galaxy. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
109. Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ∼2000 Lyα emitters at z = 6-7 over the 0.3-0.5 Gpc2 survey area.
- Author
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Masami OUCHI, Yuichi HARIKANE, Takatoshi SHIBUYA, Kazuhiro SHIMASAKU, Yoshiaki TANIGUCHI, Akira KONNO, Masakazu KOBAYASHI, Masaru KAJISAWA, Tohru NAGAO, Yoshiaki ONO, INOUE, Akio K., Masayuki UMEMURA, Masao MORI, Kenji HASEGAWA, Ryo HIGUCHI, Yutaka KOMIYAMA, Yuichi MATSUDA, Kimihiko NAKAJIMA, Tomoki SAITO, and Shiang-Yu WANG
- Subjects
ASTRONOMICAL surveys ,ASTRONOMICAL instruments ,IMAGING systems in astronomy ,DARK matter ,GALACTIC halos - Abstract
We present the SILVERRUSH program strategy and clustering properties investigated with ∼2,000 Lyα emitters at z=5.7 and 6.6 found in the early data of the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey exploiting the carefully designed narrowband filters. We derive angular correlation functions with the unprecedentedly large samples of LAEs at z=6−7 over the large total area of 14−21 deg2 corresponding to 0.3−0.5 comoving Gpc2. We obtain the average large-scale bias values of bavg=4.1±0.2 (4.5±0.6) at z=5.7 (z=6.6) for ≳L∗ LAEs, indicating the weak evolution of LAE clustering from z=5.7 to 6.6. We compare the LAE clustering results with two independent theoretical models that suggest an increase of an LAE clustering signal by the patchy ionized bubbles at the epoch of reionization (EoR), and estimate the neutral hydrogen fraction to be xHI=0.15
+0.15 −0.15 at z=6.6. Based on the halo occupation distribution models, we find that the ≳L∗ LAEs are hosted by the dark-matter halos with the average mass of log(⟨Mh⟩/M⊙)=11.1+0.2 −0.4 (10.8+0.3 −0.5 ) at z=5.7 (6.6) with a Lyα duty cycle of 1 % or less, where the results of z=6.6 LAEs may be slightly biased, due to the increase of the clustering signal at the EoR. Our clustering analysis reveals the low-mass nature of ≳L∗ LAEs at z=6−7, and that these LAEs probably evolve into massive super-L∗ galaxies in the present-day universe. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
110. Constraining the contribution of galaxies and active galactic nuclei to cosmic reionization.
- Author
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Shintaro Yoshiura, Kenji Hasegawa, Kiyotomo Ichiki, Hiroyuki Tashiro, Hayato Shimabukuro, and Keitaro Takahashi
- Subjects
- *
GALAXIES , *ACTIVE galactic nuclei , *IONIZATION (Atomic physics) , *STELLAR luminosity function , *SPECTRAL energy distribution - Abstract
Understanding the detailed process of cosmic reionization is one of the remaining problems in astrophysics and cosmology. Here we construct a model of cosmic reionization that includes contributions from high-z galaxies and active galactic nuclei (AGNs) and calculate reionization and thermal histories with the model. To keep the model general and realistic, we vary the escape fraction of ionizing photons, fesc, and the faint-end slope of theAGNluminosity function at high redshifts, αhz, within constraints from the observed cosmic star formation history and observed bright-end UV luminosity functions at z ≤ 6. Additionally, we model the spectral energy distribution (SED) of AGNs, which depends on the Eddington ratio and the black hole mass. By comparing the computed reionization histories with the observed HI fractions and the optical depth for Thomson scattering from Planck, we find that αhz > −1.5 and fesc < 0.15 are favoured when we employ the bright-end luminosity function obtained by Giallongo et al. Our result suggests that an AGN-dominated model with an abundance of faint AGNs as large as the estimate by Giallongo et al. is allowed only if the contribution from high-z galaxies is almost negligible, while a galaxy-dominant model is also allowed. We also find that the shape of the SED has a significant impact on the thermal history. Therefore it is expected that measurements of the thermal state of the intergalactic medium (IGM) will provide useful information on the properties of ionizing sources. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
111. Photic Stimulation of Intracellular cAMP-Dependent Protein Kinase in Paramecium
- Author
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Kenji Hasegawa, Yasuo Tsukahara, Sadanori Miura, Toshiro Sato, and Masakazu Shimamoto
- Subjects
Rhythm ,genetic structures ,biology ,Photic Stimulation ,Chemistry ,Biophysics ,Dusk ,Motility ,Paramecium ,Constant darkness ,biology.organism_classification ,Protein kinase A ,Intracellular - Abstract
The cellular concentration of Paramecium protein kinase A (PKA) exhibits a bi-modal pattern in a 12-h light and 12-h dark cycle, with peaks around midday and immediately after dusk, in contrast to that measured in constant darkness (DD) which exhibits a mono-phasic pattern with a trough after subjective midday and a peak around subjective midnight. The bi-modal increases in PKA concentration caused by the onset (dawn) and offset (dusk) of illumination might contribute discrete phase-advances of the motility rhythm in P. multimicronucleatum. Fluctuation of PKA concentrations in DD is significantly related to that of frequency of changing moving-direction, on which PKA concentrations elevated during illumination may be additively observed to cause the bi-modal pattern.
- Published
- 1996
112. A CASE OF OBSTRUCTIVE JAUNDICE CAUSED BY TUBERCULOUS ADENITIS IN THE PORTA HEPATIS
- Author
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Atsushi Imamura, Akihiko Nakagawa, Uetsuji S, Kenji Hasegawa, Yasuo Kamiyama, Soichiro Takai, Keita Kono, and Masanori Kon
- Subjects
Porta hepatis ,medicine.medical_specialty ,business.industry ,Radiography ,medicine.medical_treatment ,Adenitis ,Jaundice ,medicine.disease ,Tuberculous lymphadenitis ,Surgery ,medicine.anatomical_structure ,Biliary tract ,Laparotomy ,Medicine ,Radiology ,medicine.symptom ,Differential diagnosis ,business - Abstract
We present a case of benign biliary stricture caused by adenitis in the porta hepatis, which was determined tuberculous by diagnostic laparoscopic bioposy and subsequent histologic examiantion. A 22-year-old man, who was previously healthy and no history of suffering from disease, was admitted to our hospital because of general fatigue and jaundice. The laboratory findings revealed obstructive jaundice, and a stricture of the biliary tract was onfirmed by ERCP. Abdominal ultrasonogram and CT scan demonstrated enlarged lymph nodes in the porta hepatis. With a suspecion of malignant involvement, an exploratory laparoscopic biopsy was performed, and, then histologic examination revealed calcified granulomas consistent with tuberculous lymphadenitis. To our knowledge, only 9 cases of biliary stricture caused by tuberculous adenitis have been reported inJapan including our case. Radiographic differential diagnosis of tuberculous adenitis from malignant diseases have been reported to be difficult in the previous cases. They performed an invasive laparotomy to get the diagnosis of tuberculous adenitis. The use of laparoscopic procedure for histological diagnosis could avoid the problem of unnecessary invasive surgery and enable us to perform immediate therapy.
- Published
- 1996
113. Rediscovering America : Japanese Perspectives on the American Century
- Author
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Peter Duus, Kenji Hasegawa, Peter Duus, and Kenji Hasegawa
- Subjects
- Political science, Public opinion--Japan, History
- Abstract
In this extraordinary collection of writings, covering the period from 1878 to 1989, a wide range of Japanese visitors to the United States offer their vivid, and sometimes surprising perspectives on Americans and American society. Peter Duus and Kenji Hasegawa have selected essays and articles by Japanese from many walks of life: writers and academics, bureaucrats and priests, politicians and journalists, businessmen, philanthropists, artists. Their views often reflect power relations between America and Japan, particularly during the wartime and postwar periods, but all of them dealt with common themes—America's origins, its ethnic diversity, its social conformity, its peculiar gender relations, its vast wealth, and its cultural arrogance—making clear that while Japanese observers often regarded the U.S. as a mentor, they rarely saw it as a role model.
- Published
- 2011
114. WHERE ARE THE LOW-MASS POPULATION III STARS?
- Author
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Hajime Susa, Shingo Yokoi, Tomoaki Ishiyama, Nozomu Tominaga, Kae Sudo, and Kenji Hasegawa
- Subjects
Physics ,010308 nuclear & particles physics ,Metallicity ,Milky Way ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Galaxy ,Stars ,Star cluster ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Disc ,010303 astronomy & astrophysics ,Reionization ,Astrophysics::Galaxy Astrophysics ,Dwarf galaxy - Abstract
We study the number and the distribution of low mass Pop III stars in the Milky Way. In our numerical model, hierarchical formation of dark matter minihalos and Milky Way sized halos are followed by a high resolution cosmological simulation. We model the Pop III formation in H2 cooling minihalos without metal under UV radiation of the Lyman-Werner bands. Assuming a Kroupa IMF from 0.15 to 1.0 Msun for low mass Pop III stars, as a working hypothesis, we try to constrain the theoretical models in reverse by current and future observations. We find that the survivors tend to concentrate on the center of halo and subhalos. We also evaluate the observability of Pop III survivors in the Milky Way and dwarf galaxies, and constraints on the number of Pop III survivors per minihalo. The higher latitude fields require lower sample sizes because of the high number density of stars in the galactic disk, the required sample sizes are comparable in the high and middle latitude fields by photometrically selecting low metallicity stars with optimized narrow band filters, and the required number of dwarf galaxies to find one Pop III survivor is less than ten at 10 Msun., accepted by ApJ, 11 pages, 8 figures
- Published
- 2016
115. An inter‐oscillator mechanism modulating circadian clock period in paramecium populations
- Author
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Takashi Sasahara, Hideo Suzuki, Kenji Hasegawa, Masakazu Shimamoto, Yasuo Tsukahara, Ian G. Gleadall, Akihiro Tanakadate, and Isoji Miwa
- Subjects
Genetics ,biology ,Physiology ,Period (gene) ,Circadian clock ,biology.organism_classification ,Bacterial circadian rhythms ,Cell biology ,Light effects on circadian rhythm ,Physiology (medical) ,Circadian rhythm ,Paramecium ,Mating ,Oscillating gene ,Ecology, Evolution, Behavior and Systematics - Abstract
In populations of the ciliate protozoan, Paramecium multimicronucleatum, the circadian‐clock‐con‐trolled mating reaction expressed by a limited number of cells among them feeds back to contribute to coherence of their circadian rhythms of motility and mating reaction. This eventually causes a decrease in the period of the rhythms from the entrained 24h period to a steady‐state period of about 22h, with the rate of decrease depending on the strength of the mating reaction. These results suggest that the interaction among oscillators may be one of the factors which modulate the period of a circadian clock composed of nearly identical oscillators. The clock‐controlled mating reaction provides a promising inter‐oscillator pathway for obtaining more insight into the mechanism of modulation of the period of such circadian clocks through inter‐oscillator interaction.
- Published
- 1995
116. Dynamics of Repeated Parallel Turns of Snow Ski
- Author
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Shiro Shimizu and Kenji Hasegawa
- Subjects
Dynamics (mechanics) ,Atmospheric sciences ,Snow ,Geology - Published
- 1995
117. The impacts of ultraviolet radiation feedback on galaxies during the epoch of reionization
- Author
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B. Semelin, Kenji Hasegawa, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS-PSL)
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,0103 physical sciences ,Radiative transfer ,010303 astronomy & astrophysics ,Reionization ,ComputingMilieux_MISCELLANEOUS ,Astrophysics::Galaxy Astrophysics ,Physics ,[PHYS]Physics [physics] ,010308 nuclear & particles physics ,Star formation ,Astronomy ,Astronomy and Astrophysics ,Photoevaporation ,Galaxy ,Supernova ,13. Climate action ,Space and Planetary Science ,Halo ,Low Mass ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We explore the impacts of ultraviolet (UV) radiation feedback on galaxies during the epoch of reionisation by cosmological simulations in which hydrodynamics and the transfer of the H and He ionising photons are consistently coupled. Moreover we take into account H_2 non-equilibrium chemistry, including photo-dissociation. The most striking feature of the simulations is a high spatial resolution for the radiative transfer (RT) calculation which enables us to start considering not only external UV feedback processes but also internal UV feedback processes in each galaxy. We find that the star formation is significantly suppressed due to the internal UV and supernova (SN) feedback. In low mass galaxies with M, 14 pages, 13 figures, 1 table, accepted for publication in MNRAS
- Published
- 2012
118. Impacts of ultraviolet radiation feedback on the cosmic reionization history
- Author
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Kenji Hasegawa and B. Semelin
- Subjects
Physics ,Star formation ,media_common.quotation_subject ,Astronomy ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Galaxy ,Universe ,Ultraviolet astronomy ,Observational cosmology ,Galaxy formation and evolution ,Stellar evolution ,Reionization ,Astrophysics::Galaxy Astrophysics ,media_common - Abstract
We aim to clarify the impact of ultraviolet (UV) radiation feedback on cosmic reionization history. For the purpose, we perform radiation hydrodynamic simulations in which the formation of galaxies regulated by internal UV feedback and the global ionization of IGM by ionizing photons emitted from these galaxies are consistently solved. As a result, we find that the internal UV feedback severely suppresses the star formation not only in low mass galaxies but also in massive galaxies. One of the reasons for the suppression of the star formation in massive galaxies is smoothing of internal density structures by the internal UV and SN feedback. The smoothing of internal density structures also results in enhancements of the ionizing photon escape fractions. Our simulations well reproduce observed star formation rate densities and neutral hydrogen fractions at z ≤ 7 - 8, but cannot reproduce the optical depth for the Thomson scattering measured by WAMP. These results imply that missing sources, such as Popuplation III stars, are responsible for the reonization in the early Universe.
- Published
- 2012
119. Formation and radiative feedback of first objects and first galaxies
- Author
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Kenji Hasegawa, Hajime Susa, B. Semelin, Tamon Suwa, Masayuki Umemura, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS Paris)
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Dark matter ,General Physics and Astronomy ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Galactic halo ,0103 physical sciences ,Protostar ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Reionization ,Astrophysics::Galaxy Astrophysics ,ComputingMilieux_MISCELLANEOUS ,Physics ,[PHYS]Physics [physics] ,010308 nuclear & particles physics ,Star formation ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Stars ,Astrophysics of Galaxies (astro-ph.GA) ,Halo ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
First, the formation of first objects driven by dark matter is revisited by high-resolution hydrodynamic simulations. It is revealed that dark matter haloes of ~10^4M_sun can produce first luminous objects with the aid of dark matter cusps. Therefore, the mass of first objects is smaller by roughly two orders of magnitude than in the previous prediction. This implies that the number of Pop III stars formed in the early universe could be significantly larger than hitherto thought. Secondly, the feedback by photo-ionization and photo-dissociation photons in the first objects is explored with radiation hydrodynamic simulations, and it is demonstrated that multiple stars can form in a 10^5M_sun halo. Thirdly, the fragmentation of an accretion disk around a primordial protostar is explored with photo-dissociation feedback. As a result, it is found that the photo-dissociation can reduce the mass accretion rate onto protostars. Also, protostars as small as 0.8M_sun may be ejected and evolve with keeping their mass, which might be detected as "real first stars" in the Galactic halo. Finally, state-of-the-art radiation hydrodynamic simulations are performed to investigate the internal ionization of first galaxies and the escape of ionizing photons. We find that UV feedback by forming massive stars enhances the escape fraction even in a halo as massive as > 6* 10^9M_sun, while it reduces the star formation rate significantly. This may have a momentous impact on the cosmic reionization., 26 pages, 14 figures
- Published
- 2012
120. Roles of cyclic nucleotide in circadian clock
- Author
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Katsuharu Matsumoto, Yasuo Tsukahara, Kenji Hasegawa, and Masakazu Shimamoto
- Subjects
Cyclic nucleotide ,chemistry.chemical_compound ,chemistry ,Circadian clock ,Biology ,Cell biology - Published
- 1994
121. The American Occupiers
- Author
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Kenji Hasegawa and Peter Duus
- Published
- 2011
122. Illusion and Disillusion
- Author
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Kenji Hasegawa and Peter Duus
- Subjects
Psychoanalysis ,media_common.quotation_subject ,Illusion ,Art ,media_common - Published
- 2011
123. Modan America
- Author
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Peter Duus and Kenji Hasegawa
- Published
- 2011
124. Rediscovering AmericaJapanese Perspectives on the American Century
- Author
-
Peter Duus and Kenji Hasegawa
- Subjects
History ,American Century ,Political economy ,Economic history - Published
- 2011
125. Students and Immigrants
- Author
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Kenji Hasegawa and Peter Duus
- Subjects
media_common.quotation_subject ,Immigration ,Demographic economics ,Sociology ,media_common - Published
- 2011
126. The American Enemy
- Author
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Kenji Hasegawa and Peter Duus
- Published
- 2011
127. America Ascendant
- Author
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Peter Duus and Kenji Hasegawa
- Published
- 2011
128. A 1/4-inch 250 k pixel IT-CCD image sensor
- Author
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Hiroaki Ohki, Kenji Hasegawa, Jun-ya Suzuki, Hiroyuki Mori, Osamu Nishima, Yukinobu Wataya, Hiroshi Mori, Eiji Machisima, Mitsuru Yamashita, Koichiro Uchimura, Kazuomi Ezoe, and Tamaike Ikezawa
- Subjects
Physics ,Image area ,Pixel ,business.industry ,Optics ,Transfer (computing) ,Optical format ,Media Technology ,Charge-coupled device ,Electrical and Electronic Engineering ,Image sensor ,business ,Electronic circuit ,Voltage - Abstract
A 510-pixel (H)*492-pixel (V) IT (interline transfer) CCD (charge coupled device) with 3.65-mm (H)*2.73-mm (V) image area, corresponding to a 1/4-in optical format, has been developed. The basic characteristics of this CCD are better than or equal to those of the conventional 1/3-in 250 k CCD. Simplifying the driving circuit (54% of the components of the conventional CCD) and shrinking the package (70% of the size of the conventional CCD) makes possible the downsizing of a camera system. >
- Published
- 1993
129. A Case of Lung Cancer Associated with Pulmonary Sarcoidosis
- Author
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Kenji Hasegawa, Kenji Niitani, Takafumi Tsuya, Takeshi Isobe, Yasuhiro Yoshida, and Michio Yamakido
- Subjects
Pulmonary and Respiratory Medicine ,Pathology ,medicine.medical_specialty ,Pulmonary sarcoidosis ,Oncology ,business.industry ,Medicine ,business ,Lung cancer ,medicine.disease - Published
- 1993
130. ChemInform Abstract: Synthesis and Structure of N-(Silylalkyl)amides: Rhodium-Catalyzed Hydrosilylation of Enamides
- Author
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Shinzi Kato, Toshiaki Murai, Kiyoko Tsutsui, Fumihiro Kimura, and Kenji Hasegawa
- Subjects
Phthalimide ,chemistry.chemical_compound ,Silylation ,chemistry ,Hydrosilylation ,Amide ,Migratory insertion ,Organic chemistry ,Regioselectivity ,General Medicine ,Oxidative addition ,Medicinal chemistry ,Acetamide - Abstract
Rh(II) acetate effectively catalyzed the hydrosilylation of enamides, N-vinylurea, and imides to give N-(silylalkyl)amide derivatives in moderate to high yields. The silyl group was selectively introduced to the carbon atom adjacent to the nitrogen atom, whereas the efficiency and regioselectivity of the Rh-catalyzed hydrosilylation of vinyl carboxylates, thiocarboxylates, ethers, and thioethers were highly affected by the substitution patterns of the substrates and reaction conditions. The reaction of N-vinylphthalimide (1f) with deuteriosilane suggests that the catalytic process involving the oxidative addition of hydrosilane and migratory insertion of the alkenyl group of 1f is reversible. The molecular structures of the N-(1-silylethyl)phthalimide 2f and N-(1-silylethyl)acetamide 2k species have been determined by X-ray analyses. The results show that there is no intramolecular interaction between the silicon atom and the oxygen atom of the carbonyl groups of 2f and 2k.
- Published
- 2010
131. [Construction of a system for proper TS-1 application]
- Author
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Sayaka, Azuma, Shigefumi, Morimoto, Kunihiko, Kagawa, Yoshinori, Katada, Kenji, Hasegawa, and Katsuyoshi, Tabuse
- Subjects
Male ,Antimetabolites, Antineoplastic ,Creatinine ,Humans ,Female ,Aged ,Drug Therapy, Computer-Assisted ,Monitoring, Physiologic ,Tegafur - Abstract
TS-1 is an oral anti-tumor drug, which contains 5-chloro-2, 4-dihydroxypyridine (CDHP), a compound mainly excreted in urine. Since the CDHP concentration is increased among patients with impaired renal function, the frequency of side effects of TS-1 increases in such patients. Therefore, we constructed a computer-aided system that enables prompt monitoring of creatinine clearance (Ccr) calculated from the serum creatinine levels of patients prescribed TS-1 at the time pharmacists prepare the medicine. With this system, we found two cases who were prescribed TS-1, despite their decreased Ccr. One was a patient whose estimated Ccr was less than 30 mL/min/m2. With such renal malfunction, pharmacokinetics of the drug was considerably changed compared with normal control, and the dosage should be reduced. The other case presented with severe jaundice and had only a mild decrease of renal function (Ccr: 50 mL/min/m2). So we measured the concentration of uracil in the urine and performed a drug lymphocyte stimulation test for further investigation of concomitant affecting factors. Our system is useful because it can show pharmacists both the dosage TS-1 patients take and their renal function at a glance in real time. This system can be adapted for every medicine which might accumulate in patients with renal dysfunction.
- Published
- 2010
132. A Clinicopathological Study of Carcinoembryonic Antigen(CEA) Expression Patterns in Small-sized Adenocarcinomas of the Lung
- Author
-
Takesi Isobe, Naoki Yamaoka, Takafumi Tsuya, Yukio Takeshima, Michio Yamakido, Kenji Hasegawa, Shuji Yonehara, Kouki Inai, Takashi Nishisaka, and Yasuhiro Yoshida
- Subjects
Pulmonary and Respiratory Medicine ,Oncology ,medicine.medical_specialty ,Lung ,biology ,business.industry ,medicine.anatomical_structure ,Carcinoembryonic antigen ,Internal medicine ,medicine ,Cancer research ,biology.protein ,business - Published
- 1992
133. A Clinicopathological Study of Adenosquamous Carcinoma of the Lung
- Author
-
Kouki Inai, Takashi Nishisaka, Isao Murakami, Yukio Takeshima, Yasuhiro Yoshida, Shuji Yonehara, Naoki Yamaoka, Kenji Hasegawa, Takafumi Tsuya, and Michio Yamakido
- Subjects
Pulmonary and Respiratory Medicine ,Oncology ,medicine.medical_specialty ,Thesaurus (information retrieval) ,Adenosquamous carcinoma ,business.industry ,Internal medicine ,medicine ,medicine.disease ,business - Published
- 1992
134. Robotics applied to sports engineering
- Author
-
Masatada Yoshizawa, Shiro Shimizu, and Kenji Hasegawa
- Subjects
Human-Computer Interaction ,Sports engineering ,Engineering drawing ,Hardware and Architecture ,Control and Systems Engineering ,Computer science ,business.industry ,Robotics ,Artificial intelligence ,business ,Software ,Simulation ,Computer Science Applications - Abstract
(2000). Robotics applied to sports engineering. Advanced Robotics: Vol. 14, No. 5, pp. 377-379.
- Published
- 2000
135. Significance of urinary glucaric acid measurement and its application to paclitaxel therapy
- Author
-
Shigefumi, Morimoto, Toshiki, Koda, Tomoki, Suidzu, Ryunosuke, Uranishi, Yoshiharu, Shono, Isao, Akiyama, Kumiyo, Shimizu, Yoshikazu, Fujita, Kenji, Hasegawa, and Katsuyoshi, Tabuse
- Subjects
Male ,Glucaric Acid ,Cytochrome P-450 Enzyme System ,Paclitaxel ,Humans ,Anticonvulsants ,Female ,Middle Aged ,Antineoplastic Agents, Phytogenic ,Aged - Abstract
Individual variations in P-450 activity affect the in vivo pharmacokinetics as well as the efficacy and side effect of drugs. It is proposed that urinary glucaric acid (GA) level may indirectly represent P-450 activity and may therefore be an indicator of P- 450 activity in the clinical setting. However, no standard method has been developed so far. Metabolism of paclitaxel (PTX), an anticancer drug, is mediated by P-450. If P-450 activity could be predicted by measuring urinary GA level during PTX administration and individual blood PTX concentration could be inferred, urinary GA level would be a potent tool to predict the efficacy and side effects of the drug. We therefore measured the urinary GA levels of patients on antiepileptics that are suggested to induce P-450 and those of control subjects, to determine whether urinary GA level could be an indicator of P-450 activity. Then, we examined the relationship between urinary GA level and blood PTX concentration and looked into the possibility of predicting pharmacokinetics based on the relationship between urinary GA level and area under the blood concentration-time curve (AUC). The means+/-S. D. of urinary [(GA level)/(Cr level) x 10] levels of 16 patients on antiepileptic medication and 24 control subjects were 0. 98 mg/mL+/-0. 91 and 0. 19 mg/mL+/-0. 07, respectively. The urinary GA levels of patients on antiepileptic medication were significantly higher than those of control subjects. On the other hand, the relationship between AUC and urinary GA levels in eight patients on PTX showed that AUC tended to become large when urinary GA levels were low. The above results reveal that measuring urinary GA level by the easy and noninvasive way of urine collection would enable us to predict P-450 activity and infer blood PTX concentration.
- Published
- 2009
136. Individual differences in rate-limiting reactions during metabolism of irinotecan hydrochloride
- Author
-
Shigefumi, Morimoto, Ichiro, Matsuura, Yoshiharu, Shono, Tetsuya, Horiuchi, Yumi, Nakajima, Takashi, Miyabe, Yoshimi, Hachino, Kenji, Hasegawa, Kazuyo, Matsuyama, Yoshikazu, Fujita, and Katsuyoshi, Tabuse
- Subjects
Adult ,Aged, 80 and over ,Male ,Individuality ,Humans ,Camptothecin ,Female ,Middle Aged ,Infusions, Intravenous ,Irinotecan ,Antineoplastic Agents, Phytogenic ,Aged - Abstract
Irinotecan hydrochloride (CPT-11) is converted to SN-38 by carboxylesterase, SN-38 is conjugated by UDP-glucuronosyl- transferase (UGT) to SN-38G. Individual differences in enzyme activity influence the efficacy of this anticancer agent and the adverse reactions it induces. In this study, individual differences in the metabolism of this drug were determined by calculating its c 1 on version (CPT-11 to SN-38) and conjugation ratios (SN-38 to SN-38G) from blood concentrations of CPT-11, SN-38, and SN-38G at immediately and 60 min after a 90-min intravenous infusion of CPT-11. Changes in conversion and conjugation during long-term infusion of CPT-11 were also investigated. The median conversion and conjugation ratios were 0.0155 and 2.812, respectively (n=48). Based on these values, the patients were classified into four types: low-low type (10.4%), low-high type (31.2%), high-low type (31.2%), and high high type (27.1%). Prolongation of infusion time resulted in an increase in the conversion ratio in the low-high type and an increase in the conjugation ratio in the high-low type. These changes, however, were very slight in the high-high type. Thus, a longer infusion time made it possible to increase the number of doses in the low-high type and minimize adverse reactions in the high-low type.In patients found to have a low SN-38 conversion ratio or SN-38G conjugation ratio based on simple assessment of data obtained by 2-point blood sampling, modification of infusion time may allow pharmacokinetic changes that confer a clinical benefit.
- Published
- 2009
137. Formation of globular clusters induced by external ultraviolet radiation
- Author
-
Kenji Hasegawa, Masayuki Umemura, and Tetsu Kitayama
- Subjects
Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Star formation ,Metallicity ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Compact star ,Astrophysics - Astrophysics of Galaxies ,Stars ,Star cluster ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Globular cluster ,Galaxy formation and evolution ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Mass-to-light ratio ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present a novel scenario for globular cluster (GC) formation, where the ultraviolet (UV) background radiation effectively works so as to produce compact star clusters. Here, we explore the formation of GCs in UV radiation fields. For this purpose, we calculate baryon and dark matter (DM) dynamics in spherical symmetry, incorporating the self-shielding effects by solving the radiative transfer of UV radiation. In addition, we prescribe the star formation in cooled gas components and pursue the dynamics of formed stars. As a result, we find that the evolution of subgalactic objects in UV background radiation are separated into three types, that is, (1) prompt star formation, where less massive clouds ~10^{5-8} M_sun are promptly self-shielded and undergo star formation, (2) delayed star formation, where photoionized massive clouds >10^8 M_sun collapse despite high thermal pressure and are eventually self-shielded to form stars in a delayed fashion, and (3) supersonic infall, where photoionized less massive clouds ~10^{5-8} M_sun contract with supersonic infall velocity and are self-shielded when a compact core forms. In particular, the type (3) is a novel type found in the present simulations, and eventually produces a very compact star cluster. The resultant mass-to-light ratios, half-mass radii, and velocity dispersions for the three types are compared to the observations of GCs, dwarf spheroidals (dSphs), and ultra-compact dwarfs (UCDs). It turns out that the properties of star clusters resulting from supersonic infall match well with those of observed GCs, whereas the other two types are distinct from GCs. Hence, we conclude that supersonic infall in a UV background is a promising mechanism to form GCs., 11pages, 9figures, accepted for publication in MNRAS, a few typos are fixed
- Published
- 2009
138. [Significance of urinary uracil measurement following administration of DPD inhibitory fluoropyrimidine(DIF)products]
- Author
-
Tetsuya, Horiuchi, Yoshiharu, Shono, Takashi, Miyabe, Yumi, Nakajima, Isao, Akiyama, Kagehiro, Uchida, Yoshikazu, Fujita, Kenji, Hasegawa, and Katsuyoshi, Tabuse
- Subjects
Adult ,Male ,Duodenal Neoplasms ,Stomach Neoplasms ,Fluorine Compounds ,Humans ,Antineoplastic Agents ,Female ,Enzyme Inhibitors ,Middle Aged ,Uracil ,Dihydrouracil Dehydrogenase (NADP) ,Aged - Abstract
Individual differences in 5-FU metabolism are mainly attributed to individual differences in the activity of DPD, an enzyme that can metabolize more than 85% of 5-FU. Because urinary uracil is a reflection of DPD activity, it is measured to predict and prevent the occurrence of side effects caused by pyrimidine-type chemotherapeutic agents. From urinary uracil values measured in 84 gastrointestinal cancer patients, 0-60 mmol/g.creatinine was set as a standard. In patients whose urinary uracil values exceeded the standard, 5-FU tended to be accumulated when S-1, a DIF product, was administered and side effects, such as anorexia, vomiting and diarrhea occurred immediately after the start of S-1 administration. If an appropriate DIF product is selected and its dosage set based on the patient's urinary uracil value, the occurrence of side effects would be reduced. Subsequently, a continuation of medication would be possible.
- Published
- 2009
139. Radiative Regulation of Population III Star Formation
- Author
-
Hajime Susa, Masayuki Umemura, and Kenji Hasegawa
- Subjects
Physics ,education.field_of_study ,Photon ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Star formation ,Population ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Radiation ,medicine.disease_cause ,Ionizing radiation ,Stars ,Space and Planetary Science ,medicine ,Radiative transfer ,Physics::Atomic and Molecular Clusters ,Astrophysics::Solar and Stellar Astrophysics ,Physics::Chemical Physics ,education ,Ultraviolet ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We explore the impact of ultraviolet (UV) radiation from massive Population III (Pop III) stars of 25, 40, 80, and 120 M_sun on the subsequent Pop III star formation. In this paper, particular attention is paid to the dependence of radiative feedback on the mass of source Pop III star. UV radiation from the source star can work to impede the secondary star formation through the photoheating and photodissociation processes. Recently, Susa & Umemura (2006) have shown that the ionizing radiation alleviates the negative effect by H_2-dissociating radiation from 120$M_sun PopIII star, since an H_2 shell formed ahead of an ionizing front can effectively shield H_2-dissociating radiation. On the other hand, it is expected that the negative feedback by H_2-dissociating radiation can be predominant if a source star is less massive, since a ratio of the H_2-dissociating photon number to the ionizing photon number becomes higher. In order to investigate the radiative feedback effects from such less massive stars, we perform three-dimensional radiation hydrodynamic simulations, incorporating the radiative transfer effect of ionizing and H_2-dissociating radiation. As a result, we find that if a source star is less massive than ~25M_sun, the ionizing radiation cannot suppress the negative feedback of H_2-dissociating radiation. Therefore, the fate of the neighboring clouds around such less massive stars is determined solely by the flux of H_2-dissociating radiation from source stars. With making analytic estimates of H_2 shell formation and its shielding effect, we derive the criteria for radiation hydrodynamic feedback depending on the source star mass., 8 pages, 9 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society
- Published
- 2009
- Full Text
- View/download PDF
140. Cyclicdeformation and tribological behavior of an amorphous iron-based alloy film
- Author
-
Toyoji Nishiwaki, Kenji Hasegawa, Toru Imura, Motoharu Moori, Yoshihito Kawamura, and Makoto Takagi
- Subjects
Materials science ,Amorphous metal ,Mechanical Engineering ,Alloy ,Metallurgy ,chemistry.chemical_element ,Bending ,engineering.material ,Tribology ,Condensed Matter Physics ,Fatigue limit ,Amorphous solid ,Metal ,chemistry ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,engineering ,General Materials Science ,Cobalt - Abstract
To study the cyclic deformation and tribological behavior of amorphous alloy films and blocks (powder compacts), two types of fatigue test (cyclic bending) apparatus, wear rate test apparatus and an apparatus for measuring static and kinetic friction coefficients were constructed. From the strain amplitude-lifetime curves obtained, it was found that the fatigue limit of the amorphous films is higher than that of ordinary metal films such as 304 stainless steel films and that the fatigue limit obtained by testing three types of amorphous films, i.e. iron-based, cobalt-based and nickel-based ones, in dry argon gas and in vacuum is even higher than that obtained by testing in air. The wear rate of amorphous iron-based alloy films is much less than that of crystalline specimens tested, and the wear volume tends to saturate above a certain sliding speed of the disc. As regards the static and kinetic friction coefficients of the amorphous specimens (μ s and μ k , respectively), both are lower than those of crystalline specimens, in particular, in the case of μ k for amorphous-amorphous contact ( μ k = 0.04).
- Published
- 1991
141. Extremely Facile Arene Exchange on a Ruthenium(II) Complex Having a Novel Bis(silyl) Chelate Ligand (9,9-Dimethylxanthene-4,5-diyl)bis(dimethylsilyl) (Xantsil)
- Author
-
Hiroshi Ogino, Jim Josephus Gabrillo Minglana, Hiromi Tobita, Lung Shiang Luh, Masaaki Okazaki, and Kenji Hasegawa
- Subjects
Silylation ,Ligand ,Organic Chemistry ,Thermal decomposition ,chemistry.chemical_element ,Medicinal chemistry ,Toluene ,Ruthenium ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Organic chemistry ,Chelation ,Physical and Theoretical Chemistry ,Benzene - Abstract
Thermolysis of Ru3(CO)12 in the presence of 4,5-bis(dimethylsilyl)-9,9-dimethylxanthene (xantsilH2) (1) at 120 °C afforded cis-Ru(CO)4(xantsil) [2; xantsil = (9,9-dimethylxanthene-4,5-diyl)bis(dimethylsilyl)] as a main product. Isolated 2 reacted with toluene on reflux to give cis-Ru(CO)(xantsil)(η6-C6H5CH3) (3). The η6-toluene ligand of 3 was cleanly replaced with η6-benzene at room temperature by simply dissolving 3 in benzene.
- Published
- 1999
142. [Study of a relationship between a change in the urinary uracil value after a S-1 long-term administration and the recurrence of stomach cancer]
- Author
-
Shigefumi, Morimoto, Takeshi, Tsuji, Yoshiharu, Shono, Isao, Akiyama, Yoshikazu, Fujita, Kenji, Hasegawa, and Katsuyoshi, Tabuse
- Subjects
Male ,Drug Combinations ,Oxonic Acid ,Time Factors ,Health ,Recurrence ,Stomach Neoplasms ,Humans ,Female ,Middle Aged ,Uracil ,Aged ,Tegafur - Abstract
S-1 has been reported good results in the treatment of stomach cancer. However, a DPD activity change has also been reported as one of the causes for a recurrence though some recurrence cases observing a state of tumor being unchanged continuously for more than 1 year. Therefore the urinary uracil value, which could simply be predicted in the DPD activity at the time of a recurrence after having administered S-1 for a long-term, was measured. And the urinary uracil value was examined whether it could become an index of recurrence compared with a healthy 5-person example as reference. In the result, a monthly difference in change of the urinary uracil values of the reference was small. However, the urinary uracil values in patients who were administered S-1 more than 6 months but recurred, were significantly lower comparing with the healthy 5-person example. We concluded from this study that the change in DPD activity due to an induction of DPD by 5-FU and metastasis of cancer caused the recurrence and lower a urinary value. The urinary uracil value reflecting DPD activity of the whole body could be used as an index of recurrence at the time of long-term dosage of S-1. Furthermore, a measurement of the urinary uracil value seems to be promising for estimation and evaluation of the cure.
- Published
- 2008
143. [Determining S-1 dosage at hospitals prioritizing cancer chemotherapy]
- Author
-
Shigefumi, Morimoto, Noriaki, Kitada, Setsuko, Anami, Takashi, Miyabe, Satoko, Morita, Masakatsu, Watari, Hajime, Yamasaki, Hiroshi, Imamura, Hiroshi, Furukawa, Kenji, Hasegawa, and Katsuyoshi, Tabuse
- Subjects
Male ,Drug Combinations ,Oxonic Acid ,Dose-Response Relationship, Drug ,Neoplasms ,Antineoplastic Combined Chemotherapy Protocols ,Humans ,Female ,Middle Aged ,Combined Modality Therapy ,Hospitals ,Aged ,Tegafur - Abstract
Although it is recommended that the standard S-1 dosage should be based on how large the body surface area is, an on-site setting of the appropriate dosage is often lower than the standard one, depending on the individual's condition and considering possible side effects and so, on. Here, we investigated usage conditions for S-1 as a part of field training for expert pharmacists at our hospital that performs total clinical treatments. Decreases in dosage per day for elderly patients were although the standard dosage is generally determined according to the amount of a patient's body surface. We conducted a retrospective survey with a total 90 patients by creating a tree-diagram to identify a reduction standard. It was found that the S-1 dosage was decreased when there were side effects, aggravation in performance status, decrease in kidney function, old age, combined injection chemotherapy, and a decrease in radiation therapy performance. The dosage decreases without such medical reasons were seen in only 4 of the 90 patients. The individual target dosage on the basis of daily medical examination.
- Published
- 2008
144. [Equalization of spread of breast cancer chemotherapy regimen at general hospitals--with EC and FEC regimens]
- Author
-
Noriaki, Kitada, Takahiro, Nakayama, Satoko, Morita, Hideaki, Sasaoka, Hajime, Yamasaki, Setsuko, Anami, Masayuki, Tatsuta, Hiroshi, Furukawa, Shigefumi, Morimoto, Takashi, Miyabe, Kenji, Hasegawa, Katsuyoshi, Tabuse, Kohji, Takara, Teruyoshi, Yokoyama, and Masakatsu, Watari
- Subjects
Adult ,Male ,Dose-Response Relationship, Drug ,Breast Neoplasms ,Middle Aged ,Hospitals ,Risk Factors ,Antineoplastic Combined Chemotherapy Protocols ,Humans ,Female ,Fluorouracil ,Cyclophosphamide ,Aged ,Epirubicin - Abstract
We investigated the differences in safety and management of adverse events of chemotherapy among three hospitals, Sakai Municipal Hospital, Takarazuka Municipal Hospital and National Hospital Organization Osaka-minami Medical Center. The main purpose of this study was to equalize the spread of breast cancer chemotherapy regimen. The following three regimens were evaluated; epirubicin (75 mg/m(2)) /cyclophosphamide (500 mg/m(2)) (EC75), epirubicin (75 mg/m(2)) /cyclophosphamide (500 mg/m(2)) /5-fluorouracil (500 mg/m(2)) (FEC75) and epirubicin (100 mg/m(2)) / cyclophosphamide (500 mg/m(2)) /5-fluorouracil (500 mg/m(2)) (FEC100). Sixty-three patients were evaluated. We studied the level of myelosuppression after each regimen. As a result, there was no significant difference in neutrocyte counts at nadir after chemotherapy among hospitals and regimens. However, the values tended to be ranked EC75FEC75FEC100. In addition, we examined the risk of febrile neutropenia (FN) according to the multi- national association for supportive care in cancer (MASCC) scoring system. Almost all patients (61/63) were in the low risk group of FN, and only two patients had developed FN. At one hospital, patients receiving chemotherapy were prescribed ciprofloxacin tablets prophylactically for prexia over 38 deg C, and the patients learned from it. Thus, no marked difference in the safety (side effects such as myelosuppression) was recognized. However, management of side effects was different among these hospitals. In conclusion, it is very important to provide patients with adequate information on side effects.
- Published
- 2008
145. [Improvement of urinary d-glucaric acid assay and its application]
- Author
-
Kohei, Hasegawa, Kumiyo, Shimidzu, Shigehumi, Morimoto, Yoshimi, Hachino, Kenji, Hasegawa, Yoshiharu, Shono, Tetuya, Horiuchi, Katsuyoshi, Tabuse, Yurina, Masui, Takako, Yamaguchi, and Yoshikazu, Fujita
- Subjects
Glucaric Acid ,Cytochrome P-450 Enzyme System ,Liver ,Creatinine ,Neoplasms ,Humans ,Antineoplastic Agents ,Drug Monitoring ,Biomarkers ,Drug Administration Schedule - Abstract
We propose an improved method to measure urinary D-glucaric acid (GA), which might be of value as an indirect index of the activity of cytochrome P450 (CYP). This method was about 20 times more sensitive than existing methods. Beer's law was obeyed in the concentration range 5.5-66 ng ml(-1) for GA, with the effective molar absorptivity at 533 nm and the relative standard deviation being 9.1 x 10(5) dm(3) mol(-1) cm(-1) and 0.69% (n = 6), respectively. In addition, we introduced the correction value {GA/Cr ratio x10} of urinary GA by measuring urinary creatinine (Cr) at the same time. Based on the proposed method, the GA and Cr values in spot urines of healthy persons and cancer patients were subsequently measured and the correction values of both groups subjected to comparison. As a result, a statistically significant difference was recognized between the two groups.
- Published
- 2008
146. A rapid diagnosis (SK-013) for periodontitis based on the enzymatic activity of periodontopathic bacteria. Study on the characterization of the SK-013 and the enzyme specificity
- Author
-
Kazuyuki ISHIHARA, Yuko NAITO, Tetsuo KATO, Ichiro TAKAZOE, Katsuji OKUDA, Toru EGUCHI, Koichi NAKASHIMA, Naoki MATSUDA, Kyoko YAMASAKI, Kenji HASEGAWA, Hirohisa SUIDO, and Kunio SUGIHARA
- Subjects
Diagnostic methods ,Microbiology ,medicine ,Bacteroides ,Humans ,Treponema ,Periodontitis ,Capnocytophaga species ,chemistry.chemical_classification ,biology ,Reproducibility of Results ,food and beverages ,Treponema denticola ,Clinical Enzyme Tests ,biology.organism_classification ,medicine.disease ,stomatognathic diseases ,Enzyme ,chemistry ,Enzyme specificity ,Indicators and Reagents ,Capnocytophaga ,Periodontopathic bacteria ,Peptide Hydrolases - Abstract
We present studies for development of an enzymatic diagnostic method for periodontitis. A rapid and sensitive diagnostic method named SK-013 was provided by Sunstar Inc. to evaluate the peptidase activities specifically derived from periodontopathic bacteria such as Bacteroides gingivalis, Bacteroides forsythus and Treponema denticola and some strains of Capnocytophaga species. The results obtained indicated the specificity of the enzymatic reaction in this system.
- Published
- 1990
147. Histological study on wound healing of rat palatal mucosa following the application of Softach A
- Author
-
Masahiro Matsuura, Kunio Sugihara, Masaki Nakagaki, Takashi Takata, Kenji Hasegawa, Hiromasa Nikai, Miwako Ureshino, and Shigeyuki Watanabe
- Subjects
Pathology ,medicine.medical_specialty ,business.industry ,medicine ,Fibrin matrix ,Wound healing ,business - Published
- 1990
148. Adolescent Nonfunctioning Pituitary Adenoma with Short Stature
- Author
-
Tetsuro Tamura, Hidekoko Okazaki, Ryuichi Tanaka, Ken Morii, and Kenji Hasegawa
- Subjects
Adenoma ,Adult ,Male ,medicine.medical_specialty ,Visual acuity ,Adolescent ,Hydrocortisone ,Hormone Replacement Therapy ,Body height ,Endocrinology, Diabetes and Metabolism ,Visual Acuity ,Pituitary neoplasm ,Short stature ,Endocrinology ,Pituitary adenoma ,Internal medicine ,medicine ,Humans ,Pituitary Neoplasms ,Hormone replacement therapy ,Growth Disorders ,Human Growth Hormone ,business.industry ,medicine.disease ,Body Height ,medicine.symptom ,business ,Gonadotropins ,medicine.drug - Published
- 1998
149. Design of Fault-Detection, Isolation, Reconfigurat
- Author
-
Noriaki Tawada, Kensuke Inagaki, Kenji Hasegawa, Hiroshi Hayatake, Yoshiaki Ohkami, Shinichiro Narita, Taichi Watanabe, and Takashi Shioike
- Subjects
Isolation (health care) ,business.industry ,Computer science ,Embedded system ,business ,Fault detection and isolation - Published
- 2005
150. Can HI 21-cm lines trace the missing baryons in the filamentary structures?
- Author
-
Toshihiro HORII, Shinsuke ASABA, Kenji HASEGAWA, and Hiroyuki TASHIRO
- Subjects
BARYONS ,METAPHYSICAL cosmology ,INTERSTELLAR medium ,HYDROGEN ,HYDRODYNAMICS ,GALAXIES - Abstract
A large fraction of baryons predicted from the standard cosmology is still missing observationally. Although previous numerical simulations have indicated that most of the missing baryons reside in large-scale filaments in the form of the warm-hot intergalactic medium (WHIM), it is generally very difficult to detect signatures from such a diffuse gas. In this work, we focus on the hyperfine transition of neutral hydrogen (HI), called the 21-cm line, as a tool to trace theWHIM. For the purpose, we first construct themap of the 21-cm signals by using the data provided by the state-of-the-art cosmological hydrodynamics simulation project, Illustris, in which detailed processes affecting the dynamical and thermal evolution of the WHIM are implemented. From a comparison of the constructed 21-cm signal map with the expected noise level of the Square Kilometre Array phase 1 mid-frequency instrument (SKA1-mid), we find that the 21-cm signals from the WHIM in the filamentary structures at redshifts z = 0.5-3 are too small to detect with the SKA1-mid. Our results suggest that a sensitivity about 10 times higher than the SKA1-mid is possibly enough to detect the WHIM at z = 0.5-3. However, we also show that the signals of the filamentary structures including the contribution from galaxies are detectable with the SKA1-mid if we assume the angular resolution of Δθ ⩾ 10' and the observing time of t
obs ⩾ 100 hr. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
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