270 research outputs found
12 Years of Precision Calculations for LEP. What's Next?
I shortly review time period of twelve years, 1989-2000, which was devoted to
a theoretical support of experiments at LEP and SLC at Z resonance and discuss
several directions of possible future work in the field of precision
theoretical calculations for experiments at future colliders.Comment: 11 Latex, including 1 figures. Updated version as appeared in the
Journa
Half a Century of Supreme Court Clean Air Act Interpretation: Purposivism, Textualism, Dynamism, and Activism
This Article addresses the history of the Supreme Court’s interpretation of the Clean Air Act, which now goes back almost half a century. Many scholars have argued that the Court has shifted from an approach to statutory interpretation that relied heavily on purposivism—the custom of giving statutory goals weight in interpreting statutes—toward one that relies more heavily on textualism during this period. At the same time, proponents of dynamic statutory interpretation have argued that courts, in many cases, do not so much excavate a statute’s meaning as adapt a statute to contemporary circumstances
Harmonic and reactive power compensation as ancillary services in inverter-based distributed generation
Automatic one-loop calculation of MSSM processes with GRACE
We have developed the system for the automatic computation of cross-sections,
{\tt GRACE/SUSY}, including the one-loop calculations for processes of the
minimal supersymmetric extension of the the standard model. For an application,
we investigate the process .Comment: 4 pages, 1 figure, Talk presented by Jimbo, M. at ACAT-0
Actionneur à deux degrés de liberté pour micro robot mobile
Ce projet présente un actionneur à deux degrés de liberté (mouvement verticale et rotation) pour des micro-robots mobiles. L’actionneur possède un encombrement de 12 x 10.4 x 3 mm3 et une course de 5.5 mm. L’actionnement est basé sur le principe du stick-slip avec des actionneurs piézo-électriques avec des pieds conducteurs pour éviter des fils. L’actionneur est capable de soulever un poids de 2.5 g et présente des vitesses maximales de 0.7 mm/s en verticale et 0.18 rad/s en rotation
Cyclosporine A reduces microvascular obstruction and preserves left ventricular function deterioration following myocardial ischemia and reperfusion
Postconditioning and cyclosporine A prevent
mitochondrial permeability transition pore opening providing
cardioprotection during ischemia/reperfusion.
Whether microvascular obstruction is affected by these
interventions is largely unknown. Pigs subjected to coronary
occlusion for 1 h followed by 3 h of reperfusion were
assigned to control (n = 8), postconditioning (n = 9) or
cyclosporine A intravenous infusion 10-15 min before the
end of ischemia (n = 8). Postconditioning was induced by
8 cycles of repeated 30-s balloon inflation and deflation.
After 3 h of reperfusion magnetic resonance imaging,
triphenyltetrazolium chloride/Evans blue staining and histopathology
were performed. Microvascular obstruction
(MVO, percentage of gadolinium-hyperenhanced area) was
measured early (3 min) and late (12 min) after contrast
injection. Infarct size with double staining was smaller in
cyclosporine (46.2 ± 3.1 %, P = 0.016) and postconditioning
pigs (47.6 ± 3.9 %, P = 0.008) versus controls
(53.8 ± 4.1 %). Late MVO was significantly reduced by
cyclosporine (13.9 ± 9.6 %, P = 0.047) but not postconditioning
(23.6 ± 11.7 %, P = 0.66) when compared with
controls (32.0 ± 16.9 %). Myocardial blood flow in the
late MVO was improved with cyclosporine versus controls
(0.30 ± 0.06 vs 0.21 ± 0.03 ml/g/min, P = 0.002) and
was inversely correlated with late-MVO extent ( = 0.93,
P\0.0001). Deterioration of left ventricular ejection
fraction (LVEF) between baseline and 3 h of reperfusion
was smaller with cyclosporine (-7.9 ± 2.4 %, P = 0.008)
but not postconditioning (-12.0 ± 5.5 %, P = 0.22) when
compared with controls (-16.4 ± 5.5 %). In the three
groups, infarct size (\beta = -0.69, P\0.001) and late MVO
(\beta = -0.33, P = 0.02) were independent predictors of
LVEF deterioration following ischemia/reperfusion
(R^{2} = 0.73, P\0.001). Despite both cyclosporine A and
postconditioning reduce infarct size, only cyclosporine A
infusion had a beneficial effect on microvascular damage
and was associated with better preserved LV function when
compared with controls
Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2
We investigate near-Fermi-energy (EF) element-specific electronic and spin
states of ferromagnetic van der Waals (vdW) metal Fe5GeTe2. The soft x-ray
angle-resolved photoemission spectroscopy (SX-ARPES) measurement provides
spectroscopic evidence of localized Fe 3d band. We also find prominent
hybridization between the localized Fe 3d band and the delocalized Ge/Te p
bands. This picture is strongly supported from direct observation of the
remarkable spin polarization of the ligand p bands near EF, using x-ray
magnetic circular dichroism (XMCD) measurements. The strength of XMCD signal
from ligand element Te shows the highest value, as far as we recognize, among
literature reporting finite XMCD signal for none-magnetic element in any
systems. Combining SX-ARPES and elemental selective XMCD measurements, we
collectively point an important role of giant spin polarization of the
delocalized ligand Te states for realizing itinerant long-range ferromagnetism
in Fe5GeTe2. Our finding provides a fundamental elemental selective view-point
for understanding mechanism of itinerant ferromagnetism in low dimensional
compounds, which also leads insight for designing exotic magnetic states by
interfacial band engineering in heterostructures
The Higgs - photon - Z boson coupling revisited
We analyze the coupling of CP-even and CP-odd Higgs bosons to a photon and a
Z boson in extensions of the Standard Model. In particular, we study in detail
the effect of charged Higgs bosons in two-Higgs doublet models, and the
contribution of SUSY particle loops in the minimal supersymmetric extension of
the Standard Model. The Higgs- coupling can be measured in the decay
+Higgs at colliders running on the Z resonance, or in
the reverse process Higgs with the Higgs boson produced at LHC.
We show that a measurement of this coupling with a precision at the percent
level, which could be the case at future colliders, would allow to
distinguish between the lightest SUSY and standard Higgs bosons in large areas
of the parameter space.Comment: 18 pages LaTex + 7 figures (ps). Typo corrected in eq.(5
Probing scalar-pseudoscalar mixing in the CP violating MSSM at high-energy colliders
We study the production processes , and
in the context of the CP violating MSSM. In a given
channel we show that the cross-section for all i (=1,2,3) can be above 0.1 fb
provided M_{H_{2,3}}\la 300 GeV. This should be detectable at a Next Linear
Collider and would provide evidence for scalar-pseudoscalar mixing.Comment: 17 pages, RevTex, 4 ps figures, figure 4 changed, minor modifications
to text, version to appear in PR
Analytic properties of the Landau gauge gluon and quark propagators
We explore the analytic structure of the gluon and quark propagators of
Landau gauge QCD from numerical solutions of the coupled system of renormalized
Dyson--Schwinger equations and from fits to lattice data. We find sizable
negative norm contributions in the transverse gluon propagator indicating the
absence of the transverse gluon from the physical spectrum. A simple analytic
structure for the gluon propagator is proposed. For the quark propagator we
find evidence for a mass-like singularity on the real timelike momentum axis,
with a mass of 350 to 500 MeV. Within the employed Green's functions approach
we identify a crucial term in the quark-gluon vertex that leads to a positive
definite Schwinger function for the quark propagator.Comment: 42 pages, 16 figures, revtex; version to be published in Phys Rev
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