86 research outputs found
Inverse bremsstrahlung absorption in spherical laser targets
Inverse bremsstrahlung has been incorporated into an analytical model of the expanding corona of a laser-irradiated spherical target. Absorption decreases slowly with increasing intensity, in agreement with some numerical simulations, and contrary to estimates from simple models in use up to now, which are optimistic at low values of intensity and very pessimistic at high values. Present results agree well with experimental data from many laboratories; substantial absorption is found up to moderate intensities,say below IOl5 W cm-2 for 1.06 pm light. Anomalous absorption, wher, included in the analysis, leaves practically unaffected the ablation pressure and mass ablation rate, for given absorbed intensity. Universal results are given in dimensionless fom
BMSSM Implications for Cosmology
The addition of non-renormalizable terms involving the Higgs fields to the
MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. We analyze
in detail the two main cosmological issues affected by the BMSSM: dark matter
and baryogenesis. The regions for which the relic abundance of the LSP is
consistent with WMAP and collider constraints are identified, showing that the
bulk region and other previously excluded regions are now permitted. Requiring
vacuum stability limits the allowed regions. Based on a two-loop finite
temperature effective potential analysis, we show that the electroweak phase
transition can be sufficiently first order in regions that for the MSSM are
incompatible with the LEP Higgs mass bound, including parameter values of
\tan\beta \lsim 5, m_{\tilde{t}_{1}} > m_t, m_Q << TeV.Comment: 28 pages, 4 figures. References adde
Exploración posturográfica de pacientes simuladores
Introduction: An aphysiological pattern in computerized
dynamic posturography (CDP) may be produced by numerous
causes. We analyze the results obtained in this test
by a group of malingering patients.
Patients and method: This study analyzes a particular
group of 7 malingerers, ie patients simulating a false and
unreal equilibrium disorder, without any a priori awareness
of the gain expected from a pathological report. The condition
can only be identified with the very complex postural
disorder known as “continuous imbalance.” We analyze the
results of the dynamic posturography test following the
diagnostic criteria described by other authors.
Results: Of the criteria analyzed, we found Cevette’s to be
the most frequently positive for our study group.
Conclusions: The wide diversity in the criteria used makes
it necessary to apply them together, assuming a high level
of suspicion and great care in the diagnostic process
Phenomenological viability of orbifold models with three Higgs families
We discuss the phenomenological viability of string multi-Higgs doublet
models, namely a scenario of heterotic orbifolds with two Wilson lines,
which naturally predicts three supersymmetric families of matter and Higgs
fields. We study the orbifold parameter space, and discuss the compatibility of
the predicted Yukawa couplings with current experimental data. We address the
implications of tree-level flavour changing neutral processes in constraining
the Higgs sector of the model, finding that viable scenarios can be obtained
for a reasonably light Higgs spectrum. We also take into account the tree-level
contributions to indirect CP violation, showing that the experimental value of
can be accommodated in the present framework.Comment: 31 pages, 12 figures. Comments and references added. Final version to
be published in JHE
EVALUACIÓN DE SUSTRATOS ECOCOMPATIBLES EN EL CULTIVO DE ARÁNDANO (Vaccinium corymbosum L.) EN ASUNCIÓN NOCHIXTLÁN, OAXACA / EVALUATION OF ECOCOMPATIBLE SUBSTRATES IN THE CULTIVATION OF BLUEBERRY (Vaccinium corymbosum L.) IN ASUNCIÓN NOCHIXTLÁN, OAXACA
Se evaluó el cultivo de arándano (Vaccinium corymbosum L.) variedad Biloxi con cinco tratamientos: corteza de pino + turba + arcilla expandida + vermiculita (CPTAEV 30/40/15/15 V/V), corteza de pino (CP 100%), corteza de pino + turba (CPT 70/30 V/V), corteza de pino + turba + arcilla expandida + vermiculita (CPTAEV 60/30/5/5 V/V) y corteza de pino + turba (CPT 60/40 V/V). La investigación se realizó bajo un diseño completamente al azar, con cinco repeticiones por tratamiento; los análisis de varianza y la comparación de medias fueron mediante la prueba de Tukey (≤ 0.05), utilizando el paquete estadístico SASMR (Statistical Analysis System) versión 9.0. Las variables evaluadas fueron: altura de la planta, número de ramas, longitud de ramas, grosor de los tallos y número de frutos. Los resultados mostraron que los tratamientos en las variables de grosor de caña, número de cañas y longitud de cañas, no presentan diferencias significativas lo cual quiere decir que los tratamientos son iguales para estas variables. Las variables altura y número de frutos en el tratamiento 1, registraron los mejores resultado
Estudio de casos y controles entre anastomosis intra y extracorpórea en pacientes intervenidos de hemicolectomía derecha laparoscópica
Introduction: There is still insufficient scientific evidence on which is the best technique to
perform the anastomosis -intracorporeal (IC) or extracorporeal (EC)- in right laparoscopic
hemicolectomy. The objective of the present study is to determine whether there are
differences to compare in both techniques.
Material and methods: A study was performed on a prospective patient series subjected to
right laparoscopic hemicolectomy in our Hospital. The preoperative and the postoperative
variables associated with complications recorded depending on the type of anastomosis.
Results: A total of 60 patients were intervened form June 2004 to June 2010 (35 IC; 25 EC).
There were no significant differences between both groups as regards baseline preoperative
characteristics or associated comorbidities. The median operation time was 212 minutes
(142-305 min), with no significant difference between both techniques. The number of
lymph nodes removed was higher in the IC group (21 versus 14; p = 0.03). The beginning
of oral tolerance and the first bowel movement were significantly earlier in the IC group. The
complications rate was similar for both groups (14% IC; 16% EC; p = 0.89). Three patients in
the IC group had anastomosis dehiscence. The mortality rate was 2.8% (one patient in each
group).
Conclusion: Intracorporeal versus extracorporeal anastomosis in right laparoscopic hemicolectomy
can obtain a higher number of resected lymph nodes and an earlier oral tolerance
and intestinal transit
Cell identity and nucleo-mitochondrial genetic context modulate OXPHOS performance and determine somatic heteroplasmy dynamics
Heteroplasmy, multiple variants of mitochondrial DNA (mtDNA) in the same cytoplasm, may be naturally generated by mutations but is counteracted by a genetic mtDNA bottleneck during oocyte development. Engineered heteroplasmic mice with nonpathological mtDNA variants reveal a nonrandom tissue-specific mtDNA segregation pattern, with few tissues that do not show segregation. The driving force for this dynamic complex pattern has remained unexplained for decades, challenging our understanding of this fundamental biological problem and hindering clinical planning for inherited diseases. Here, we demonstrate that the nonrandom mtDNA segregation is an intracellular process based on organelle selection. This cell type-specific decision arises jointly from the impact of mtDNA haplotypes on the oxidative phosphorylation (OXPHOS) system and the cell metabolic requirements and is strongly sensitive to the nuclear context and to environmental cues
Interaction of Nearly-Inviscid, Multi-mode Faraday Waves and Mean Flows
Faraday waves [1] are gravity-capillary waves that are excited on the surface of a fluid when its container is vibrated vertically and the vertical acceleration exceeds a threshold value. These waves have received much attention in the literature both as a basic fluid dynamical problem and as a paradigm of a pattern-forming system [2-4]. Unfortunately, in the low viscosity limit, there are several basic issues that remain unresolved, particularly in connection with the generation of mean flows in the bulk. The viscous part of these flows (also called streaming flow or acoustic streaming) is driven by the oscillatory boundary layers attached to the solid walls and the free surface by well-known mechanisms first uncovered by Schlichting [5] and Longuet-Higgins [6]. This mean flow has been shown recently to affect the dynamics of the primary waves at leading order in a related, laterally vibrated system [7]. This is somewhat similar to the effect of an internal circulation on surface wave dynamics in drops [8]
Influence of the length of hospitalisation in post-discharge outcomes in patients with acute heart failure: Results of the LOHRCA study
Objective: To investigate the relationship between length of hospitalisation (LOH) and post-discharge outcomes in acute heart failure (AHF) patients and to ascertain whether there are different patterns according to department of initial hospitalisation.
Methods: Consecutive AHF patients hospitalised in 41 Spanish centres were grouped based on the LOH (15 days). Outcomes were defined as 90-day post-discharge all-cause mortality, AHF readmissions, and the combination of both. Hazard ratios (HRs), adjusted by chronic conditions and severity of decompensation, were calculated for groups with LOH >6 days vs. LOH <6 days (reference), and stratified by hospitalisation in cardiology, internal medicine, geriatrics, or short-stay units.
Results: We included 8563 patients (mean age: 80 (SD = 10) years, 55.5% women), with a median LOH of 7 days (IQR 4–11): 2934 (34.3%) had a LOH 15 days. The 90-day post-discharge mortality was 11.4%, readmission 32.2%, and combined endpoint 37.4%. Mortality was increased by 36.5% (95%CI = 13.0–64.9) when LOH was 11–15 days, and by 72.0% (95%CI = 42.6–107.5) when >15 days. Conversely, no differences were found in readmission risk, and the combined endpoint only increased 21.6% (95%CI = 8.4–36.4) for LOH >15 days. Stratified analysis by hospitalisation departments rendered similar post-discharge outcomes, with all exhibiting increased mortality for LOH >15 days and no significant increments in readmission risk.
Conclusions: Short hospitalisations are not associated with worse outcomes. While post-discharge readmissions are not affected by LOH, mortality risk increases as the LOH lengthens. These findings were similar across hospitalisation departments
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