Dynamischer Strukturfaktor von Plasmen in hoch angeregten Clustern

Der dynamische Strukturfaktor von Nanoplasmen in hoch angeregten Clustern wurde im Rahmen einer klassischen Molekulardynamik (MD)-Simulation modelliert. Er wurde für Cluster verschiedener Größen durch die Einführung der bilokalen Stromdichte-Korrelationsfunktion verallgemeinert. Mehrere Anregungsmoden wurden gefunden, durch Lösung einer Eigenwertgleichung charakterisiert und deren Dispersion in Abhängigkeit von Dichte, Temperatur und Clustergröße diskutiert. Die Erweiterung des Konzeptes für den dynamischen Strukturfaktor beim Übergang von Bulk zu finiten Plasmen wurde dargestellt.The dynamical structure factor of nano plasmas in strongly excited clusters was investigated via classical molecular dynamics (MD) simulations. It was generalized via introduction of the bilocal current density correlation function for clusters of different sizes. Several excitation modes were found and characterized, solving an eigenvalue problem and their dispersion with dependence on temperature, density and cluster size was discussed. The generalization of the dynamical structure factor concept going from bulk to finite plasmas was shown

Sedentarismo y Sobrepeso/Obesidad asociados a la prevalencia de infección por Virus de Papiloma Humano de alto riesgo en mujeres de la zona norte de Bucaramanga

Introduction: Infection with Human Papillomavirus is mandatory for cervical cancer development. However, viral elimination is associated to multiple factors, according to the population characteristics and geographic areas, some are modifiable and others not. Objective: To determine the factors associated with the prevalence of high risk human papillomavirus infection in women between 35-65 years old with moderate or high risk of cervical cancer located at the northern zone of Bucaramanga Methodology: Cross-sectional analytical study. Women classified as moderate/ high risk for cervical cancer in a short standardized survey, were surveyed on the side effects associated to chronic viral infection and self-sampling cervical test. Bivariate analysis and multiple analysis of log-binomial regression were performed. Results: 810 women were interviewed; 435 cases of high cancer risk were presented. The prevalence of high risk human papilloma virus infection was 5.1% (95% CI 3.2-7.6). The sedentary lifestyle (RPa 2.51, 95% CI 1.15-5.50) and overweight/obesity (PRa 4.20, 95% CI 1.00-15.51) were associated with higher prevalence. In addition, there was a trend of increased prevalence of infection among users of injectable contraceptives; as well as a tendency to decrease this prevalence according to portions of fruits and vegetables consumed daily. Conclusion: modifiable factors such as sedentary lifestyle and overweight / obesity were independently associated with a higher prevalence of infection by human high risk papilloma virus in the population studied. Introducción: Para el desarrollo de cáncer de cuello de uterino la infección con el Virus de Papiloma Humano (VPH) es una causa necesaria. Sin embargo, la eliminación viral está asociada a múltiples factores, algunos modificables y otros no, que varían según las características poblacionales y áreas geográficas. Objetivo: Determinar factores asociados a la prevalencia de infección por virus de Papiloma Humano de alto riesgo en mujeres entre 35-65 años con riesgo moderado o alto de cáncer de cuello uterino de la zona norte de Bucaramanga. Metodología: Estudio analítico de corte transversal. A las mujeres clasificadas como de moderado/alto riesgo para cáncer de cuello uterino en una encuesta corta estandarizada, se les realizó una encuesta sobre factores potenciales asociados a infección, seguida de una autónoma de muestra cérvical, que se utilizó para detección de DNA viral. Se realizó análisis múltiple de regresión log-binomial para obtener Razones de Prevalencia ajustadas (RPa). Resultados: Se entrevistaron 810 mujeres, de éstas 435 tuvieron moderado/alto riesgo para cáncer y se realizaron la autotoma. La prevalencia de infección por VPH de alto riesgo fue de 5,1% (IC 95% 3,2-7,6). El sedentarismo (RPa 2,51; IC95% 1,15-5,50) y el sobrepeso/obesidad (PRa 4,20; IC95% 1,00-15,51) se asociaron a mayor prevalencia. Además, hubo una tendencia de incremento en la prevalencia de infección en las usuarias de anticonceptivos inyectables; así como una tendencia de disminución de esta prevalencia según porciones de frutas y verduras consumidas diariamente. Conclusión: Factores modificables como sedentarismo y sobrepeso/obesidad, se asociaron independientemente a mayor prevalencia de infección por VPH en la población estudiada.&nbsp

Spatially resolved collective excitations of nano-plasmas via molecular dynamics simulations and fluid dynamics

Collective excitations in nano-plasmas are described by dynamical bi-local auto-correlation functions. These excitations, which are related to the plasmon excitations in bulk plasmas, arise in the classical as well as the quantum regime. Instead of the wave-vector-dependent dynamical structure factor, which is not well defined in finite systems, two different signatures are considered to characterize collective excitations: the bi-local particle density correlation function and the bi-local current density correlation function. The relation between both signatures is not as trivial as in the homogeneous case and is given here. Exemplary calculations are performed for expanding nearly spherical clusters of sodium atoms after excitation by a high-intensity short pulse laser beam. The lowest collective excitations obtained in the classical regime using molecular dynamics simulations agree well with the lowest collective excitations obtained from quantum calculations using fluid dynamics. The energy, damping and structure of the lowest collective modes are given. The dynamical bi-local correlation functions are of relevance for the optical properties, in particular the determination of photo absorption coefficients of nano-plasmas

Burnout Syndrome among General Hospital Nurses in Recife

This descriptive, cross sectional, census study identified the occurrence of Burnout and some associated factors among nurses working in obstetrics & gynecology and pediatric care at a general tertiary hospital in Recife. Sixty-three nurses (98.4%) answered a self-administered questionnaire (sociodemographic aspects, working conditions, and Maslach Burnout Inventory). Chi-square was used in the analysis with a 95% confidence level. Most participants were female (92.1%), with up to five years in the career (68.2%), 52.5% in pediatric area. High levels of emotional stress (49.2%) and depersonalization (27.0%) were identified, as well as low professional fulfillment (4.8%), and 4.7% presented Burnout. The following factors wee associated: high levels of emotional stress and often/always perform tasks very quickly (p=0.039) and receiving a salary incompatible to the effort employed (p=0.016); high levels of depersonalization and with up to five years in this career (p=0.010) and often/always perform tasks very quickly (p=0.009). For 19.0%, at least two of the three dimensions pointed to high propensity to the syndrome.Este estudo descritivo, transversal, censitário, identificou Burnout e alguns fatores associados entre enfermeiros da assistência pediátrica e tocoginecológica de hospital geral do nível terciário de atenção do Recife (PE). Participaram 63 profissionais (98,4% do total) que responderam a um questionário auto-aplicável (aspectos sócio-demográficos, condições laborais e Maslach Burnout Inventory). Na análise utilizou-se qui-quadrado, com nível de confiança de 95%. Predominou o gênero feminino (92,1%), com até cinco anos de profissão (68,2%), sendo 52,5% da área pediátrica. Constataram-se altos níveis de exaustão emocional (49,2%) e despersonalização (27,0%) e baixo nível de realização profissional (4,8%), estando 4,7% com Burnout. Mostraram associação: alto nível de exaustão emocional e realizar frequentemente/sempre tarefas com muita rapidez (p=0,039) e receber salário incompatível com o esforço empregado (p=0,016); altos níveis de despersonalização e ter até cinco anos de profissão (p=0,010) e efetuar frequentemente/sempre tarefas com muita rapidez (p=0,009). Para 19,0% pelo menos duas das três dimensões apontavam alta propensão à síndrome.Estudio descriptivo, transversal, censitario, identificó Burnout y factores asociados entre enfermeros de atención pediátrica y tocoginecología de hospital general de nivel terciario de atención en Recife-PE. Participaron 63 profesionales (98,4% del total), que respondieron cuestionario autoaplicable (aspectos sociodemográficos, condiciones laborales y Maslach Burnout Inventary). Analizado según Qui-cuadrado, nivel de confianza 95%. Predominó sexo femenino (92,1%), con hasta cinco años de profesión (68,2%), perteneciendo 52,5% al área pediátrica. Se constataron altos niveles de agotamiento emocional (49,2%) y despersonalización (27,0%), y bajo nivel de realización profesional (4,8%), sufriendo 4,7% de Burnout. Mostraron asociación: altos niveles de agotamiento emocional, realizar frecuentemente/siempre tareas con mucha rapidez (p=0,039), recibir salario incompatible con esfuerzo (p=0,016); alto nivel de despersonalización y tener hasta cinco años de profesión (p=0,010) y efectuar frecuentemente/siempre tareas con mucha rapidez (p=0,009). Para 19,0% al menos dos de las tres dimensiones marcaban alta propensión al síndrome

Synthesis and Characterization of Hybrid Materials Consisting of n-octadecyltriethoxysilane by Using n-Hexadecylamine as Surfactant and Q0 and T0 Cross-Linkers

Novel hybrid xerogel materials were synthesized by a sol-gel procedure. n-octadecyltriethoxysilane was co-condensed with and without different cross-linkers using Q0 and T0 mono-functionalized organosilanes in the presence of n-hexadecylamine with different hydroxyl silica functional groups at the surface. These polymer networks have shown new properties, for example, a high degree of cross-linking and hydrolysis. Two different synthesis steps were carried out: simple self-assembly followed by sol-gel transition and precipitation of homogenous sols. Due to the lack of solubility of these materials, the compositions of the new materials were determined by infrared spectroscopy, 13C and 29Si CP/MAS NMR spectroscopy and scanning electron microscopy

The Orchestration Stack: The Impossible Task of Designing Software for Unknown Future Post-CMOS Hardware

Future systems based on post-CMOS technologies will be wildly heterogeneous, with properties largely unknown today. This paper presents our design of a new hardware/software stack to address the challenge of preparing software development for such systems. It combines well-understood technologies from different areas, e.g., network-on-chips, capability operating systems, flexible programming models and model checking. We describe our approach and provide details on key technologies