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Search Results: 1 - 10 of 120274 matches for " T. Gomez "
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Algebraic stacks
T. Gomez
Mathematics , 1999,
Abstract: This is an expository article on the theory of algebraic stacks. After introducing the general theory, we concentrate in the example of the moduli stack of vector budles, giving a detailed comparison with the moduli scheme obtained via geometric invariant theory.
Stability of conic bundles (with an appendix by Mundet i Riera)
T. Gomez,I. Sols
Mathematics , 1999,
Abstract: Roughly speaking, a conic bundle is a surface, fibered over a curve, such that the fibers are conics (not necessarily smooth). We define stability for conic bundles and construct a moduli space. We prove that (after fixing some invariants) these moduli spaces are irreducible (under some conditions). Conic bundles can be thought of as generalizations of orthogonal bundles on curves. We show that in this particular case our definition of stability agrees with the definition of stability for orthogonal bundles. Finally, in an appendix by I. Mundet i Riera, a Hitchin-Kobayashi correspondence is stated for conic bundles.
Inpatient rehabilitation outcomes in solid organ transplantation: Results of a unique partnership between the rehabilitation hospital and the multi-organ transplant unit in an acute hospital  [PDF]
John T. Patcai, Marie P. Disotto-Monastero, Manuel Gomez, Lesley E. Adcock
Open Journal of Therapy and Rehabilitation (OJTR) , 2013, DOI: 10.4236/ojtr.2013.12009
Abstract: Objective: To determine the outcomes in solid organ transplant recipients following inpatient rehabilitation, as a result of a unique partnership between the rehabilitation hospital and the multi-organ transplant program in an acute hospital. Design: Retrospective observational study. Setting: Community rehabilitation hospital affiliated with a university. Participants: A cohort of 173 organ transplant patients admitted consecutively over a four-year period (2004-2008) was compared to a cohort of all rehabilitation patients (n = 9762) admitted to the same inpatient rehab facility during the same period. Interventions: Inpatient rehab program to all participants. Main Outcome Measures: Length of hospital stay, Functional Independence Measure (FIMTM) change (admission-discharge), and rate of discharges to home. Results: Outcomes were measured using components of the FIMTM instrument, admission and discharge data. Chi-square and independent two-sample t-tests were used for statistical analysis. Compared to a general rehabilitation inpatient population, transplant rehabilitation inpatients had: more immediate (<3 days) transfers to an acute hospital (5.2% vs. 1.9%, p < 0.001); a higher rate of readmission to an acute hospital after the first 3 days (19.1% vs. 1.9%, p < 0.001); a longer mean length of stay (27 ± 19 vs. 20 ± 18 days, p < 0.001); a lower total FIMTM change (8.9 vs. 20.9, p < 0.001); a lower FIMTM efficiency (1.1 vs. 1.4, p < 0.001); and a higher rate of discharges to home in patients not readmitted to acute care (98.5% vs. 94.5% p < 0.001). Conclusion: Outcomes of rehabilitation in solid organ transplant patients are comparable but not identical to those in other patient groups. Inpatient rehabilitation for transplant patients is therefore fully justifiable and necessary. The ten times higher rate of transplant patient readmission to acute hospital must be communicated, facilitated, accepted and managed within a partnership strategy.
String Representation of Wilson Loops
E. Alvarez,C. Gomez,T. Ortin
Physics , 1998, DOI: 10.1016/S0550-3213(99)00103-0
Abstract: We explore the consequences of imposing Polyakov's zig/zag-invariance in the search for a confining string. We first find that the requirement of zig/zag-invariance seems to be incompatible with spacetime supersymmetry. We then try to find zig/zag-invariant string backgrounds on which to implement the minimal-area prescription for the calculation of Wilson loops considering different possibilities.
Parabolic bundles and representations of the fundamental group
Tomas L. Gomez,T. R. Ramadas
Mathematics , 1999,
Abstract: Let X be as smooth complex projective variety with Neron-Severi group isomorphic to Z, and D an irreducible divisor with normal crossing singularities. Assume r is equal to 2 or 3. We prove that if the fundamental group of X doesn't have irreducible PU(r) representations, then the fundamental group of X-D doesn't have irreducible U(r) representations. The proof uses the non-existence of certain stable parabolic bundles. We also obtain a similar result for GL(2) when D is smooth and X is a complex surface.
Reaction-diffusion model for pattern formation in E. coli swarming colonies with slime
M. -P. Zorzano,D. Hochberg,M. -T. Cuevas,J. -M. Gomez-Gomez
Physics , 2005, DOI: 10.1103/PhysRevE.71.031908
Abstract: A new experimental colonial pattern and pattern transition observed in E. coli MG1655 swarming cells grown on semi-solid agar are described. We present a reaction-diffusion model that, taking into account the slime generated by these cells and its influence on the bacterial differentiation and motion, reproduces the pattern and successfully predicts the observed changes when the colonial collective motility is limited. In spite of having small non-hyperflagellated swarming cells, under these experimental conditions E. coli MG1655 can very rapidly colonize a surface, with a low branching rate, thanks to a strong fluid production and a local incremented density of motile, lubricating cells.
Why do Asian-American women have lower rates of breast conserving surgery: results of a survey regarding physician perceptions
Jane T Pham, Laura J Allen, Scarlett L Gomez
BMC Public Health , 2009, DOI: 10.1186/1471-2458-9-246
Abstract: We surveyed physicians regarding treatment decision-making for early-stage breast cancer, particularly as it applies to Asian patients. Physicians were identified through the population-based Greater Bay Area Cancer Registry. Eighty (of 147) physicians completed a questionnaire on sociodemographics, professional training, clinical practices, and perspectives on the treatment decision-making processes.The most important factors identified by physicians in the BCT/MRM decision were clinical in nature, including presence of multifocal disease (86% identified this as being an important factor for selecting MRM), tumor size (71% for MRM, 78% for BCT), cosmetic result (74% for BCT), and breast size (50% for MRM, 55% for BCT). The most important reasons cited for the Asian treatment patterns were patient attitudes toward not needing to preserve the breast (53%), smaller breast sizes (25%), and fear and cultural beliefs (12%).These survey results suggest that physicians perceive major roles of both clinical and cultural factors in the BCT/MRM decision, but cultural factors may be more relevant in explaining surgical treatment patterns among Asians.For most patients with early-stage breast cancer, breast conserving treatment (BCT) provides a less invasive alternative to modified radical mastectomy (MRM) with equivalent survival [1] and possibly also better quality of life [2,3]. The use of BCT, however, occurs disproportionately in the US, with substantial ethnic, geographic and socioeconomic variation [4-8]. Asian women have MRM at significantly higher rates [5,7,9-11]; for example, in California, among stage 0–II breast cancer patients diagnosed in 1988–1995, 67.5% of Asians had MRM compared to 57.3% of Whites [5]. This proportion is even higher among certain Asian populations; more current data from the national Surveillance, Epidemiology, and End Results (SEER) program show that 54% of Vietnamese, 53% of Filipinas, and 48% of Chinese diagnosed with early-stage breast can
Social inequalities, labor, and health
Gomez, Carlos M.;Carvalho, S?nia Maria T. M. de;
Cadernos de Saúde Pública , 1993, DOI: 10.1590/S0102-311X1993000400010
Abstract: this article presents a brief analysis of the social inequalities expressed in the relationship between health and labor. it focuses on the brazilian context. it begins by approaching the conceptions present in the lines of investigation and intervention in this field of health. it considers an entire range of thinking, from the eminently biological and individual level to an understanding of the relationship between labor and health as a reflection of essentially social processes. the confrontation between conceptual advances, proposals for intervention, and the reality of health for brazilian workers is the parameter for analyzing the activity of state institutions, companies, and workers' organizations. based on the current situation outlined in this study, perspectives are identified for urgent and indispensable changes.
Pion scattering poles and chiral symmetry restoration
Fernandez-Fraile, D.;Nicola, A. Gomez;Herruzo, E. T.
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.76.085020
Abstract: Using unitarized Chiral Perturbation Theory methods, we perform a detailed analysis of the $\pi\pi$ scattering poles $f_0(600)$ and $\rho(770)$ behaviour when medium effects such as temperature or density drive the system towards Chiral Symmetry Restoration. In the analysis of real poles below threshold, we show that it is crucial to extend properly the unitarized amplitudes so that they match the perturbative Adler zeros. Our results do not show threshold enhancement effects at finite temperature in the $f_0(600)$ channel, which remains as a pole of broad nature. We also implement T=0 finite density effects related to chiral symmetry restoration, by varying the pole position with the pion decay constant. Although this approach takes into account only a limited class of contributions, we reproduce the expected finite density restoration behaviour, which drives the poles towards the real axis, producing threshold enhancement and $\pi\pi$ bound states. We compare our results with several model approaches and discuss the experimental consequences, both in Relativistic Heavy Ion Collisions and in $\pi\to \pi\pi$ and $\gamma\to \pi\pi$ reactions in nuclei.
Associative norms of 58 Spanish words for children from 8 to 13 years old.
Macizo P.,Gomez-Ariza C. J.,Bajo M. T.
Psicológica , 2000,
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