185 research outputs found
Constraints from Unrealistic Vacua in Supersymmetric Standard Model with Neutrino Mass Operators
We analyze a scalar potential of the minimal supersymmetric standard model
(MSSM) with neutrino mass operators along Unbounded-From-Below (UFB) and Color
and/or Charged Breaking (CCB) directions. We show necessary conditions to avoid
the potential minima which can be deeper than the realistic vacuum. These
conditions would constrain more strongly than conditions in the MSSM without
taking into account neutrino mass operators, and can improve the predictive
power of supersymmetric models with neutrino mass operators.Comment: 11 pages, 4 figure
Reconciliation of CDM abundance and in a radiative seesaw model
We reexamine relic abundance of a singlet fermion as a CDM candidate, which
contributes to the neutrino mass generation through radiative seesaw mechanism.
We search solutions for Yukawa couplings and the mass spectrum of relevant
fields to explain neutrino oscillation data. For such solutions, we show that
an abundance of a lightest singlet fermion can be consistent with WMAP data
without conflicting with both bounds of and . This reconciliation does not need any modification of the original
radiative seesaw model other than by specifying flavor structure of Yukawa
couplings and taking account of coannihilation effects.Comment: 16 pages, 2 figures, accepted version for publication
Investigation of symmetric relationship between evaluation of smoothness and roughness in fabric surface images
The purpose of this study was to investigate the symmetry relationship between evaluation of smoothness and roughness of fabrics and the physical factors related to the evaluations, using a set of images obtained by photographing the surfaces of eight fabrics. These fabric surface images were created by setting the distance between the fabric and the camera at approximately 1 m and gradually reducing the distance for each of the eight fabrics. Based on these images, we conducted an experiment to evaluate the smoothness and roughness of fabrics on a seven-level unipolar scale. Results showed that the evaluation characteristics of fabric smoothness and roughness with consideration of the shooting distance of the fabric surface images differed for each fabric. Furthermore, analysis of the correlation between evaluation of smoothness and roughness of fabrics indicated that symmetry was not established between evaluation of smoothness and roughness of some fabrics
The list of the Professor of Tohoku University Ito Nobuo\u27s collections, made up in Karafuto-Sakhalin during his personal scientific trip around the Middle and Southern parts of the island in 1933-1934
網膜電図の発生機構
金沢大学医学部研究課題/領域番号60771396, 研究期間(年度):1985出典:研究課題「網膜電図の発生機構」課題番号60771396(KAKEN:科学研究費助成事業データベース(国立情報学研究所)) (https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-60771396/)を加工して作
Introduction of Biomass Accounting as an Evaluation Tool of Biomass Utilization Systems: a Case Study on Domestic Animal Waste Treatment-Oriented Biomass Activities
Symposium Pape
Introduction of Biomass Accounting as an Evaluation Tool of Biomass Utilization Systems: a Case Study of Domestic Animal Waste Treatment-Oriented Biomass Town (Advanced Studies on Sustainable Animal Production: Interrelationships among Human, Animal and Environment, 8th International Symposium of Integrated Field Science)
Oral Sessio
Minimum oxygen cost of human walking with geometrically similar leg movements
The mechanism by which the expenditure of oxygen to walk per unit distance at an intermediate speed is minimized, by definition optimal walking, was investigated to characterize optimal walking in humans with variations in individual walking speeds. Oxygen uptake and step rate(SR)were measured among 7 young male subjects walking at an increasing speed from 16.7 to 131.7 m min−1 with 5 m min−1 increments every 1 min on a level treadmill. Measurements of leg length(L)were also made and step length(SL)was calculated by dividing walking speed by SR. The hip joint angle(θ)was calculated as a function of both L and SL such that θ=2sin−[1 SL(/ 2L)] deduced from a mathematical geometrically similar model of pendulum−like legs. The minimum oxygen cost to walk per unit distance for each subject was observed over a wide range of speeds from 60 to 100 m min−1.However, the oxygen cost of walking for all the subjects was minimized during a step cycle through a hip−joint angle of about 46 deg in the astride position, regardless of L. The stifflegged model demonstrated that the pathway of the trunk during optimal walking with a swing leg angle of 46 deg was approximately maintained at an even level by the counteracting effects of the leg decline and the heel rise. These results suggest that the minimum oxygen cost of transport during optimal walking was achieved by the mechanism underlying the maximum interchange between the gravitational−potential and kinetic energy for the body with an even level of the trunk that reduces extra muscular work needed against internal and external resistance, as well as against gravit
Orbifold Family Unification in SO(2N) Gauge Theory
We study the possibility of family unification on the basis of SO(2N) gauge
theory on the five-dimensional space-time, . Several SO(10),
or SU(5) multiplets come from a single
bulk multiplet of SO(2N) after the orbifold breaking. Other multiplets
including brane fields are necessary to compose three families of quarks and
leptons.Comment: 28 page
Oxidative stress induction of DJ-1 protein in reactive astrocytes scavenges free radicals and reduces cell injury
Astrocytes, one of the predominant types of glial cells, function as both supportive and metabolic cells for the brain. Under cerebral ischemia/reperfusion-induced oxidative conditions, astrocytes accumulate and activate in the ischemic region. DJ-1 has recently been shown to be a sensor of oxidative stress in living cells. However, the function of astrocytic DJ-1 is still unknown. In the present study, to clarify the effect of astrocytic DJ-1 protein under massive oxidative insult, we used a focal ischemic rat model that had been subjected to middle cerebral artery occlusion (MCAO) and reperfusion. We then investigated changes in the distribution of DJ-1 in astrocytes, DJ-1 release from cultured astrocytes, and the effects of recombinant DJ-1 protein on hydrogen peroxide (H2O2)-induced death in normal and DJ-1-knockdown SH-SY5Y cells and on in vitro scavenging of hydroxyl radicals (•OH) by electron spin resonance spectrometry. At 24 h after 2-h MCAO and reperfusion, an infarct lesion was markedly observed using magnetic resonance imaging and 2,3,5-triphenyltetrazolium chloride staining. In addition, reactive astrocytes enhanced DJ-1 expression in the penumbral zone of the ischemic core and that DJ-1 protein was extracellularly released from astrocytes by H2O2 in in vitro primary cultures. Although DJ-1-knockdown SH-SY5Y cells were markedly vulnerable to oxidative stress, treatment with glutathione S-transferase-tagged recombinant human DJ-1 protein (GST-DJ-1) significantly inhibited H2O2-induced cell death. In addition, GST-DJ-1 protein directly scavenged •OH. These results suggest that oxidative stress induces the release of astrocytic DJ-1 protein, which may contribute to astrocyte-mediated neuroprotection
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