113 research outputs found
Flavor changing neutrino interactions and CP violation in neutrino oscillations
We investigate the interference effects of non-standard neutrino-matter
interactions (NSNI) with the mass-induced neutrino oscillations. The NSNI is
composed of flavor-changing neutrino interactions (FCNI) and flavor-diagonal
neutrino interactions (FDNI). Both of the interactions are introduced in the
\nu_\mu -\nu_\tau sector and the \nu_e -\nu_\mu sector in order to study their
effects in \nu_\mu\to\nu_\tau and \nu_\mu\to\nu_e oscillations, respectively.
The FCNI effect proves to possibly dominate the CP violating effect and
significantly survive as a fake CP violating effct in the neutrino energy
region where the pure CP violating effect, ordinary matter effect and FDNI
effect fall, for example, above 4 GeV at the baseline of L=730 km in the
\nu_\mu\to\nu_\tau oscillation for the maximum parameter values of FCNI and
FDNI allowed by the atmospheric neutrino oscillation data. The FCNI and FDNI
effects on CP violation in the oscillation are negligibly
small due to the stringent constraints on FCNI from the bounds on lepton flavor
violating processes and on FDNI from the limits on lepton universality
violation.Comment: 18 pages in LaTeX2e, 12 ps figures. The discussion of detectability
of the CP violation is delete
Numerical study on cavitation erosion risk of marine propellers operating in wake flow
This paper discusses the application of the CFD to cavitating flow around marine propellers operating in ship wake. Especially the emphasis was put on the tip vortex cavitation and the erosive cavitation around the trailing edge. This research found that adaptive mesh refinement methodology was effective for the resolution of tip vortex cavitation. Next, barotropy model and full cavitation model were validated, and show qualitatively agreement with the experimental results. Finally, simple four cavitation erosion indexes were applied for the estimation of the erosion risk and one index shows good agreement with the experimental results. It is concluded that the RANS CFD gives the valuable information for judging the erosion risk although its presumption accuracy and numerical stability need to be improved.http://deepblue.lib.umich.edu/bitstream/2027.42/84232/1/CAV2009-final30.pd
Effects of the and of other processes on the mixing hierarchies in the four-generation model
We analyze in the four-generation model the first measurement of the
branching ratio of rare kaon decay , along with the
other processes of mass difference , CP-violating
parameter mixing, mixing,
, and the upper bound values of mixing
and , and try to search for mixing of the fourth
generation in the hierarchical mixing scheme of the Wolfenstein
parametrization. Using the results for the mixing of the fourth generation, we
discuss predictions of the mixing () and the
branching ratio of directly CP-violating decay process
, and the effects on the CP asymmetry in neutral B
meson decays and the unitarity triangle.Comment: 29 pages written in LaTex. 6 figures(drawn on LaTeX). Revised from
" in the four-generation model" of the same
Authors(TOKUSHIMA 99-1, January 1999). A minor chang
Molecular cloning and expression analysis of MPPa-2, a novel mouse transcript detected in a differential screen of pituitary libraries
We identified a novel isoform transcript, MPP alpha-2, of the mouse Mg(2+)-dependent protein phosphatase (MPP) alpha gene. The amino acid sequence encoded by MPP alpha-2 differs from the previously known MPP alpha-1 sequence only at the carboxyl terminal region. Northern and in situ hybridization analysis revealed differential expression patterns of these two transcripts in the embryo and in the adult organism, suggesting an elaborate regulation of the MPP alpha gene
Discovery of a Featureless X-Ray Spectrum in the Supernova Remnant Shell of G330.2+1.0
We report here on the first pointed X-ray observation of the supernova
remnant (SNR) G330.2+1.0. The X-ray morphology is characterized by an extended
shell. Its X-ray spectrum is well represented by a single power-law function
with a photon index of and interstellar absorption of
[cm]. We interpret this emission as
synchrotron radiation from accelerated electrons at the SNR shock, as seen in
SN 1006. The surface brightness of the X-ray emission is anti-correlated with
the radio emission, and the power-law spectrum is dominated at the western
shell where the radio emission is weak. The co-existence of two distinct (radio
bright/X-ray faint and radio faint/X-ray bright) shells in a single supernova
remnant challenges our understanding of the particle acceleration and radiation
mechanisms in different interstellar environments. The object may be a good
target for searching TeV gamma-rays and molecular gas surrounding the blast
shock. We also report on the nature of a bright point-like source (AX
J1601-5143) to the south of the SNR.Comment: PASJ, in pres
Reasons for Tooth Extractions in Japan: The Second Nationwide Survey
BACKGROUND: More than 10 years have passed since the first nationwide study on the reasons for tooth extraction in Japan. In the present study, we conducted the second nationwide survey to update the previous data. METHODS: This was a descriptive study. A sample population consisting of 5,250 dentists was selected by systematic random sampling using the 2018 membership directory of the Japan Dental Association. The reason for each permanent tooth extraction was documented by each dentist during a period of 1 week from June 4 to June 10, 2018. A questionnaire was provided for documentation. Reasons for tooth extraction were categorised into 6 groups as follows: caries, periodontal disease, fracture, orthodontics, impacted teeth, and others. RESULTS: A total of 2345 identified dentists responded to the questionnaire (recovery rate: 44.8%). Information on 7809 extracted teeth from 6398 patients was obtained. Periodontal disease was the main reason for tooth extraction for both sexes (men: 40.4%, women: 34.9%). Caries accounted for 30.2% of tooth extractions among men and 29.0% among women. Periodontal disease was predominant in the groups older than 55 years of age. Dental fracture accounted for 16.8% of tooth extractions among men and 19.2% among women. CONCLUSIONS: Caries and periodontal disease are still the main reasons for tooth extraction in Japan. Moreover, dentists should note that fractures accounted for approximately one-fifth of permanent tooth extractions after the age of 45 years
Self-Reported Diabetes Mellitus and Tooth Extraction Due to Periodontal Disease and Dental Caries in the Japanese Population
Diabetes mellitus is closely related to oral health. We aimed to determine the relationship between diabetes mellitus and tooth extraction due to periodontal disease and dental caries. Japan’s second nationwide survey data collected from 4 June to 10 June 2018 was used to identify reasons for tooth extraction among patients aged > 40 years. General dentists collected information on patients who underwent tooth extraction procedures, and the presence of diabetes mellitus was determined through interviews. Multivariable logistic regression was performed to investigate the relationship between diabetes mellitus and the reasons for tooth extraction, including periodontal disease and dental caries. In total, 2345 dentists responded to the survey (response rate 44.8%). We analyzed data on 4625 extracted teeth from 3750 patients (1815 males and 1935 females). Among patients with self-reported diabetes mellitus, 55.4% had extractions due to periodontal disease compared to 46.7% of such extractions among those without self-reported diabetes mellitus. Self-reported diabetes mellitus was significantly associated with tooth extraction due to periodontal disease. No significant differences were observed in dental caries according to self-reported diabetes mellitus status. This study provides further evidence of a significant association between diabetes mellitus and tooth extraction due to periodontal disease
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