36 research outputs found
New Einstein-Hilbert-type Action and Superon-Graviton Model(SGM) of Nature
A nonlinear supersymmetric(NLSUSY) Einstein-Hilbert(EH)-type new action for
unity of nature is obtained by performing the Einstein gravity analogue
geomtrical arguments in high symmetry spacetime inspired by NLSUSY. The new
action is unstable and breaks down spontaneously into E-H action with matter in
ordinary Riemann spacetime. All elementary particles except graviton are
composed of the fundamental fermion "superon" of Nambu-Goldstone(NG) fermion of
NLSUSY and regarded as the eigenstates of SO(10) super-Poincar\'e (SP) algebra,
called superon-graviton model(SGM) of nature. Some phenomenological
implications for the low energy particle physics and the cosmology are
discussed. The linearization of NLSUSY including N=1 SGM action is attempted
explicitly to obtain the linear SUSY local field theory, which is equivalent
and renormalizable.Comment: 37 pages, Latex, Based on a talk by K. Shima at International
Conference on Mathematics and Nucler Physics for the 21st Century, March
8-13, 2003, Atomic Energy Authority, Cairo, Egyp
Analysis of Hamiltonian formulations of linearized General Relativity
The different forms of the Hamiltonian formulations of linearized General
Relativity/spin-two theories are discussed in order to show their similarities
and differences. It is demonstrated that in the linear model, non-covariant
modifications to the initial covariant Lagrangian (similar to those
modifications used in full gravity) are in fact unnecessary. The Hamiltonians
and the constraints are different in these two formulations but the structure
of the constraint algebra and the gauge invariance derived from it are the
same. It is shown that these equivalent Hamiltonian formulations are related to
each other by a canonical transformation which is explicitly given. The
relevance of these results to the full theory of General Relativity is briefly
discussed.Comment: Section Discussion is modified and references are added; 19 page
Predictors of diagnostic yield in bronchoscopy: a retrospective cohort study comparing different combinations of sampling techniques
<p>Abstract</p> <p>Background</p> <p>The reported diagnostic yield from bronchoscopies in patients with lung cancer varies greatly. The optimal combination of sampling techniques has not been finally established.</p> <p>The objectives of this study were to find the predictors of diagnostic yield in bronchoscopy and to evaluate different combinations of sampling techniques.</p> <p>Methods</p> <p>All bronchoscopies performed on suspicion of lung malignancy in 2003 and 2004 were reviewed, and 363 patients with proven malignant lung disease were included in the study. Sampling techniques performed were biopsy, transbronchial needle aspiration (TBNA), brushing, small volume lavage (SVL), and aspiration of fluid from the entire procedure. Logistic regression analyses were adjusted for sex, age, endobronchial visibility, localization (lobe), distance from carina, and tumor size.</p> <p>Results</p> <p>The adjusted odds ratios (OR) with 95% confidence intervals (CI) for a positive diagnostic yield through all procedures were 17.0 (8.5–34.0) for endobronchial lesions, and 2.6 (1.3–5.2) for constriction/compression, compared to non-visible lesions; 3.8 (1.3–10.7) for lesions > 4 cm, 6.7 (2.1–21.8) for lesions 3–4 cm, and 2.5 (0.8–7.9) for lesions 2–3 cm compared with lesions <= 2 cm. The combined diagnostic yield of biopsy and TBNA was 83.7% for endobronchial lesions and 54.2% for the combined group without visible lesions. This was superior to either technique alone, whereas additional brushing, SVL, and aspiration did not significantly increase the diagnostic yield.</p> <p>Conclusion</p> <p>In patients with malignant lung disease, visible lesions and larger tumor size were significant predictors of higher diagnostic yield, after adjustment for sex, age, distance from carina, side and lobe. The combined diagnostic yield of biopsy and TBNA was significant higher than with either technique alone.</p
Quantization of an interacting spin-3/2 field and the Delta isobar
Quantization of the free and interacting Rarita-Schwinger field is considered
using the Hamiltonian path-integral formulation. The particular interaction we
study in detail is the \pi N \De coupling used in the phenomenology of the
pion-nucleon and nucleon-nucleon systems. Within the Dirac constraint analysis,
we show that there is an excess of degrees of freedom in the model, as well as
the inconsistency related to the Johnson-Sudarshan-Velo-Zwanzinger problem. It
is further suggested that couplings invariant under the gauge transformation of
the Rarita-Schwinger field are generally free from these inconsistencies. We
then construct and briefly analyse some lowest in derivatives gauge-invariant
\pi N \De couplings.Comment: 20 pages, published versio
Metastable eutectic composition determination of 1,3-dimethylurea/water system by temperature-resolved second harmonic generation (TR-SHG)
National audienc
Metastable eutectic composition determination of 1,3-dimethylurea/water system by temperature-resolved second harmonic generation (TR-SHG)
National audienc
Insights into metastable phase diagrams by temperature-resolved second harmonic generation (TR-SHG): a case study with 1,3-dimethylurea/water
International audienc