Search results for "problems"
showing 10 items of 620 documents
Orizzonti della critica testuale fra tradizione e nuovi indirizzi (Palermo, 16 Novembre 2018), in IVRA. Rivista Internazionale di diritto romano e an…
2019
Cronaca del Seminario di Diritto Romano, svoltosi presso l'Università di Palermo, il 16 Novembre 2018, sul tema "Orizzonti della critica testuale fra tradizione e nuovi indirizzi", in occasione della pubblicazione dei "Confronti testuali. Contributo alla dottrina delle interpolazioni giustinianee. Parte speciale (Materiali)" di L. Chiazzese (Annali del Seminario giuridico dell'Università di Palermo, a cura di G. Falcone, collana Fonti - 4, Torino 2018).
Problemas históricos y dificultades de los estudiantes en la conceptualización de sustancia compuesto químico
2008
Este trabajo ofrece un análisis histórico sobre los problemas que tuvo que resolver la ciencia hasta llegar a la construcción de los conceptos macroscópicos de sustancia y compuesto químico en el contexto de la teoría daltoniana. Por otra parte, en él se muestran algunas de las dificultades de comprensión que estos conceptos ofrecen a los estudiantes. Para determinarlas, se realiza un estudio transversal con alumnos de 15 a 18 años, lo que permite evaluar el significado que otorgan a la idea de sustancia, al tiempo que se constata la necesidad de su comprensión para poder entender los cambios químicos. Por último, se plantea la existencia de ciertas semejanzas entre las ideas sobre la compo…
Trunk Packing Revisited
2007
For trunk packing problems only few approximation schemes are known, mostly designed for the European standard DIN 70020 [6] with equally sized boxes [8, 9, 11, 12]. In this paper two discretized approaches for the US standard SAE J1100 [10] are presented, which make use of different box sizes. An exact branch-and-bound algorithm for weighted independent sets on graphs is given, using the special structure of the SAE standard. Another branch-and-bound packing algorithm using linear programs is presented. With these algorithms axis-oriented packings of different box sizes in an arbitrary trunk geometry can be computed efficiently.
Numerical and experimental study of liquid metal stirring by rotating permanent magnets
2018
In this work, we study liquid gallium stirring by rotating permanent magnets. We demonstrate possibility of easily creating different flow patterns by rotating permanent magnets, which can be industrially important for controlling heat and mass transfer processes in the system. Unlike the typical approach of simulating magnet rotation as a transient problem and time-averaging the Lorentz forces, we solve the magnet rotation as a harmonic (frequency domain) problem, which leads to forces equal to time-averaged ones and decreases the simulation time considerably. Numerical results are validated using qualitative flow structure results from the neutron radiography visualization of tracer parti…
Castidad o castigo. El estupro de las Vestales como símbolo de desorden social en Roma
2016
El presente artículo tiene como objetivo tratar el sacerdocio de las vestales desde la perspectiva de la virginidad y castidad de las sacerdotisas y su relación con el bienestar de la comunidad. La base principal del estudio es la revisión de las fuentes primarias y secundarias. Se destacarán las consecuentes desgracias que acaecían en caso de incumplimiento de su voto de castidad, con la imperiosa necesidad de realizar ritos expiatorios para acabar con el prodigium y buscar nuevamente la pax deorum. El estudio de las sacerdotisas de Vesta cuenta con una largahistoriografía, remontándose los primeros trabajos con valor historiográfico a la segunda mitad del siglo XIX. A pesar de que…
NT pro BNP plasma level and atrial volume are linked to the severity of liver cirrhosis.
2013
BACKGROUND AND AIMS: Plasma levels of NT-pro-BNP, a natriuretic peptide precursor, are raised in the presence of fluid retention of cardiac origin and can be used as markers of cardiac dysfunction. Recent studies showed high levels of NT pro BNP in patients with cirrhosis. We assessed NT pro-BNP and other parameters of cardiac dysfunction in patients with cirrhosis, with or without ascites, in order to determine whether the behaviour of NT pro BNP is linked to the stage of liver disease or to secondary cardiac dysfunction. METHODS: Fifty eight consecutive hospitalized patients mostly with viral or NAFLD-related cirrhosis were studied. All underwent abdominal ultrasound and upper GI endoscop…
School grades as predictors of self-esteem and changes in internalizing problems: A longitudinal study from fourth through seventh grade
2020
This longitudinal study of 562 students (from ages 10 to 13) investigated whether developmental changes in internalizing problems (emotional and peer problems) can be predicted by school grades in mathematics and language arts and whether these predictive relations are mediated by students' self-esteem. The data comprised of teacher-rated internalizing problems, grades in math and language arts, and student self-ratings of self-esteem. The latent change score modeling indicated that math grades positively predicted self-esteem. Furthermore, lower self-esteem was related to an increase in internalizing and emotional problems in the total sample, and to an increase in peer problems in boys. T…
Immigrant status, gender, and school burnout in Finnish lower secondary school students : A longitudinal study
2017
The aim of this longitudinal study among 9223 students from grade 7 and grade 9 (age 13–14 and 15–16) was to assess whether immigrant status and gender are associated with the level and change (slope) in school burnout among lower secondary school students in the Helsinki metropolitan area. Ninety-seven percent of the variation in school burnout was attributable to individual factors. Both the intercept (2.3, p < 0.001) and slope (0.5, p < 0.001) of school burnout were statistically significant. The slope showed increasing school burnout from grades 7–9. School burnout increased more in girls than in boys. Initially apparent higher school burnout among students who had immigrated to …
Allostatic Load of Men and Women in Early Middle Age
2005
Abstract. The present longitudinal study investigated three aspects of allostatic load, a long-term negative consequence of physical responses to stress: (1) sex differences in allostatic load in early middle age, (2) associations between career stability history and allostatic load, and (3) relationships between allostatic load and health problems. Participants consisted of 62 men and 55 women from the ongoing Jyväskylä Longitudinal Study of Personality and Social Development, Finland. Allostatic load was the sum of eight parameters (dehydroepiandrosterone-sulfate, 12-h urinary norepinephrine, high-density lipoprotein, triglycerides, glycosylated hemoglobin, systolic and diastolic blood p…
On the Construction of Lusternik-Schnirelmann Critical Values with Application to Bifurcation Problems
1987
An iterative method to construct Lusternik-Schnirelmann critical values is presented. Examples of its use to obtain numerical solutions to nonlinear eigenvalue problems and their bifurcation branches are given. peerReviewed