Search results for "Ham"

Renormalization-group analysis for the transition to chaos in Hamiltonian systems

2002

Abstract We study the stability of Hamiltonian systems in classical mechanics with two degrees of freedom by renormalization-group methods. One of the key mechanisms of the transition to chaos is the break-up of invariant tori, which plays an essential role in the large scale and long-term behavior. The aim is to determine the threshold of break-up of invariant tori and its mechanism. The idea is to construct a renormalization transformation as a canonical change of coordinates, which deals with the dominant resonances leading to qualitative changes in the dynamics. Numerical results show that this transformation is an efficient tool for the determination of the threshold of the break-up of…

Spatio‐temporal assessment of illicit drug use at large scale : evidence from 7 years of international wastewater monitoring

2019

Background and aims Wastewater‐based epidemiology is an additional indicator of drug use that is gaining reliability to complement the current established panel of indicators. The aims of this study were to: (i) assess spatial and temporal trends of population‐normalized mass loads of benzoylecgonine, amphetamine, methamphetamine and 3,4‐methylenedioxymethamphetamine (MDMA) in raw wastewater over 7 years (2011–17); (ii) address overall drug use by estimating the average number of combined doses consumed per day in each city; and (iii) compare these with existing prevalence and seizure data. Design Analysis of daily raw wastewater composite samples collected over 1 week per year from 2011 to…

Phytosociological and phytogeographical considerations on the orophilous alliance Berberido aetnensis-Crataegion laciniatae (Rhamno-Prunetea)

2011

Subtercola boreus gen. nov., sp. nov. and Subtercola frigoramans sp. nov., two new psychrophilic actinobacteria isolated from boreal groundwater.

2000

Psychrophilic actinobacterial isolates from permanently cold groundwater in Finland were characterized using a polyphasic approach. Growth on agar plates was observed at temperatures down to -2 degrees C, with an optimum at 15-17 degrees C, but no growth was observed at 30 degrees C. The peptidoglycan type was B2y and the characteristic diamino acid was diaminobutyric acid. The cell wall sugars of strain K265T were rhamnose, ribose, xylose and mannose and those of strain K300T were glucose, rhamnose and xylose. The polar lipids included phosphatidylglycerol, diphosphatidylglycerol, one unknown phospholipid and two glycolipids. The main whole-cell fatty acids were 12-methyltetradecanoic acid…

<p><strong>Typification of two Gandoger’s names in <em>Rhamnus </em>(Rhamnaceae)</strong></p>

2020

Gandoger’s names for Rhamnus bourgaeana and R. hispanorum (Rhamnaceae) are typified. A neotype is selected for R. bourgaeana, and a specimen preserved at M is designated as the lectotype of R. hispanorum.

Leaf domatia in the section Alaternus (Miller) DC. of the genus Rhamnus (Rhamnaceae)

1993

Anatomical and morphological study of leaves from three species of Rhamnus (R. alaternus, R. myrtifolius and R. ludovici-salvatoris) which comprise the section Alaternus (Miller) DC. from the Iberian Peninsula and Balearic Islands, have revealed the presence of domatia, which are macroscopic infundibuliform structures. Although not all the leaves of one single plant showed domatia, all the individuals of each species examined presented these structures.

Análisis comparativo de las funciones de predicción del riesgo cardiovascular SCORE y Framingham y sus versiones calibradas, SCORE calibrada y REGIDO…

2009

Introducción: Las recomendaciones del ATPIII y las SSCC europeas en prevención primaria cardiovascular aconsejan para la estimación del riesgo individual las funciones de Framingham y SCORE respectivamente. Ambas disponen de versiones calibradas para la población española. Todas, excepto Framingham(ATPIII), han sido derivadas para aplicarlas en un rango de edad limitado. Por otra parte, ninguna de estas funciones predice el riesgo cardiovascular total, ya que SCORE y SCORE calibrada sólo estima el riesgo de muerte y Framingham(ATPIII) y REGICOR el riesgo coronario. Sin embargo todas las medidas preventivas van dirigidas a la prevención de la enfermedad cardiovascular globalmente y las funci…

On Aggregation of Risk Levels Using T-Conorms

2019

This paper deals with solutions for numeric evaluation of risks containing several different risk factors assessed by experts. The proposed methods can be used to assess the risks and obtain the risk scores in different industries, including financial industry, but they are also suitable for assessing risks in other areas, e.g. project management. While risk is usually considered as a function of probability and impact with strong quantitative background, there are many practical cases when only qualitative risk assessment based on expert opinions can be used. At the same time there are still requirements and needs for applying numerical values and mathematical models to such qualitative as…

An integrated framework for risk profiling of breast cancer patients following surgery.

2006

Objective: An integrated decision support framework is proposed for clinical oncologists making prognostic assessments of patients with operable breast cancer. The framework may be delivered over a web interface. It comprises a triangulation of prognostic modelling, visualisation of historical patient data and an explanatory facility to interpret risk group assignments using empirically derived Boolean rules expressed directly in clinical terms. Methods and materials: The prognostic inferences in the interface are validated in a multicentre longitudinal cohort study by modelling retrospective data from 917 patients recruited at Christie Hospital, Wilmslow between 1983 and 1989 and predictin…

Shame in decision making under risk conditions: Understanding the effect of transparency.

2017

The role played by the emotion of shame in the area of decision-making in situations of risk has hardly been studied. In this article, we show how the socio-moral emotions and the anticipated feeling of shame associated with different options can determine our decisions, even overriding the cognitive choice tendency proposed by the certainty effect. To do so, we carried out an experiment with university students as participants, dividing them into four experimental conditions. Our findings suggest that people avoid making unethical decisions, both when these decisions are made public to others and when they remain in the private sphere. This result seems to indicate that the main factor in …