Discussion on the limit cycles of the Lev Ginzburg equation by M. Bellamy and R.E. Mickens, Journal of Sound and Vibration 308 (2007) 337-342

The authors M. Bellamy and R.E. Mickens in the article "Hopf bifurcation analysis of the Lev Ginzburg equation" published in Journal of Sound and Vibration 308 (2007) 337-342, claimed that this differential equation in the plane can exhibit a limit cycle. Here we prove that the Lev Ginzburg differential equation has no limit cycles. (C) 2012 Elsevier Ltd. All rights reserved.

Could albumin level explain the higher mortality in hemodialysis patients with pulmonary hypertension?

Background: The pathogenesis of pulmonary hypertension (PH) in hemodialysis is still unclear. The aim of thisstudy was to identify the risk factors associated with the presence of PH in chronic hemodialysis patients and toverify whether these factors might explain the highest mortality among them.Methods: We conducted a retrospective study of hemodialysis patients who started treatment from August 2001to October 2007 and were followed up until April 2011 in a Brazilian referral medical school. According to theresults of echocardiography examination, patients were allocated in two groups: those with PH and those withoutPH. Clinical parameters, site and type of vascular access, bioimpedance, and laboratorial findings were comparedbetween the groups and a logistic regression model was elaborated. Actuarial survival curves were constructed andhazard risk to death was evaluated by Cox regression analysis.Results: PH > 35 mmHg was found in 23 (30.6%) of the 75 patients studied. The groups differed in extracellularwater, ventricular thickness, left atrium diameter, and ventricular filling. In a univariate analysis, extracellular waterwas associated with PH (relative risk = 1.194; 95% CI of 1.006 1.416; p = 0.042); nevertheless, in a multiple model,only left atrium enlargement was independently associated with PH (relative risk =1.172; 95% CI of 1.010 1.359;p = 0.036). PH (hazard risk = 3.008; 95% CI of 1.285 7.043; p = 0.011) and age (hazard risk of 1.034 per year of age;95% CI of 1.000 7.068; p = 0.047) were significantly associated with mortality in a multiple Cox regression analysis.However, when albumin was taken in account the only statistically significant association was between albuminlevel and mortality (hazard risk = 0.342 per g/dL; 95% CI of 0.119 0.984; p = 0.047) while the presence of PH lost itsstatistical significance (p = 0.184). Mortality was higher in patients with PH (47.8% vs 25%) who also had astatistically worse survival after the sixth year of follow up.Conclusions: PH in hemodialysis patients is associated with parameters of volume overload that sheds light on itspathophysiology. Mortality is higher in hemodialysis patients with PH and the low albumin level can explain thisassociation.© 2012 Greenfield et al.; licensee BioMed Central Ltd.

Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn

Abstract. To date, terrestrial archives of long-term climatic change within the Arctic have widely been restricted to ice cores from Greenland and, more recently, sediments from Lake El’gygytgyn in northeast Arctic Russia. Sediments from this lake contain a paleoclimate record of glacialinterglacial cycles during the last three million years. Lowresolution studies at this lake have suggested that changes observed during Transition IV (the transition from marine isotope stage (MIS) 10 to MIS 9) are of greater amplitude than any observed since. In this study, geochemical parameters are used to infer past climatic conditions thus providing the first high-resolution analyses of Transition IV from a terrestrial Arctic setting. These results demonstrate that a significant shift in climate was subsequently followed by a rapid increase in biogenic silica (BSi) production. Following this sharp increase, bioproductivity remained high, but variable, for over a thousand years. This study reveals differences in the timing and magnitude of change within the ratio of silica to titanium (Si/Ti) and BSi records that would not be apparent in lower resolution studies. This has significant implications for the increasingly common use of Si/Ti data as an alternative to traditional BSi measurements.

Na 50 Nachlass Arthur Schopenhauer - 'Schopenhauer-Archiv', 342 - Mitteilung an Professor Hugo von Meltzl über die Überlieferungssituation der Schopenhauerschen Werke

u.a.: handschriftliche und gedruckte Aufzeichnung Schopenhauers; Ferdinand Laban; Arthur Schopenhauer;

Ms.Ff.F.Stoltze 3. 342 - Brief von Friedrich Stoltze an Frankfurt am Main / Wohn- und Miethsteuer-Commission

Wohnung und Mietverhältnis 1866

Del libro didáctico a la secuencia de formación: propuestas de intervención pedagógica. 16H/342

Este proyecto se desprende de El LD como material para la enseñanza de PLE -Perspectivas políticas: industria editorial y trabajo simbólico culminado en 2011. El análisis de los LDs (libros didácticos) de PLE (Portugués Lengua Extranjera) nos proporcionó bases teórico-metodológicas para la reflexión sobre las configuraciones textuales, discursivas y semióticas acerca de la enseñanza del PLE en la Argentina y en nuestra región. Sin embargo, consideramos que nuestra tarea investigativa debe avanzar en una propuesta de intervención pedagógica que ayude a explorar nuevas estrategias y prácticas de comprensión y producción, a partir de materiales que favorezcan aprendizajes significativos. Para ello revisamos las conclusiones elaboradas en la etapa anterior en relación con las matrices discursivas predominantes de los LDs focalizadas en las dimensiones históricopolíticas y de gramaticalización de la lengua, en las matrices ético-culturales de la identidad brasileña y en las configuraciones editoriales del mundo de los negocios. Nuestro objetivo es elaborar propuestas de intervención para la enseñanza del PLE que ponderen críticamente los posicionamientos ideológicos respecto de la lengua y las textualidades que propicien la condición dialógica del quehacer educativo. Dichas propuestas serán consideradas como secuencias de formación, entendidas como focos del proceso polisémico de los saberes implicados en el aprendizaje de una lengua extranjera.

Biagini, Hugo E., Filosofía americana e identidad 'El conflictivo caso argentino', Buenos Aires, EUDEBA, 1989, 342 p.

Fil: Sánchez, Néstor Hugo.