Search results for "Solid"
showing 10 items of 3575 documents
Estatus adulto, consolidación de identidad, religiosidad y trascendencia como predictores del bienestar psicológico en la adultez emergente
2016
El fundamento de esta tesis se encuentra en una inclinación connatural por los temas relacionados con la madurez personal y las tareas de madurez en la etapa adulta, desde la perspectiva de la Teoría del Ciclo Vital del desarrollo humano. Se profundiza en el estudio de la transición de la adolescencia a la edad adulta y en el conepto de adultez emergente propuesto por Jeffrey Jensen Arnett. Se trata de una etapa del ciclo en la que el individuo puede encontrar un espacio privilegiado donde avanzar en sus tareas evolutivas, de modo que quede definitivamente conformada su propia identidad. Esta nueva etapa sería producto de un efecto de adaptación psicológica y sociológica, existencial quizá,…
Evaluation of Superparamagnetic Silica Nanoparticles for Extraction of Triazines in Magnetic in-Tube Solid Phase Microextraction Coupled to Capillary…
2014
The use of magnetic nanomaterials for analytical applications has increased in the recent years. In particular, magnetic nanomaterials have shown great potential as adsorbent phase in several extraction procedures due to the significant advantages over the conventional methods. In the present work, the influence of magnetic forces over the extraction efficiency of triazines using superparamagnetic silica nanoparticles (NPs) in magnetic in tube solid phase microextraction (Magnetic-IT-SPME) coupled to CapLC has been evaluated. Atrazine, terbutylazine and simazine has been selected as target analytes. The superparamagnetic silica nanomaterial (SiO2-Fe3O4) deposited onto the surface of a capil…
The stress-strain state and stabilization of viscoelastoplastic, imperfect moving web continuum
2014
On modelling and stability of axially moving viscoelastic materials
2013
Preconcentration and speciation analysis of mercury : 3D printed metal scavenger-based solid-phase extraction followed by analysis with inductively c…
2021
A selective method for preconcentration and determination of methylmercury (MeHg) and inorganic mercury (iHg) in natural water samples at the ng L−1 level has been developed. The method involves adsorption of Hg species into a 3D printed metal scavenger and sequential elution with acidic thiourea solutions before ICP-MS determination. Experimental parameters affecting the preconcentration of MeHg and iHg such as the sample matrix, effect of the flow rate on adsorption, eluent composition, and elution mode have been studied in detail. The obtained method detection limits, considering the preconcentration factors of 42 and 93, were found to be 0.05 ng L−1 and 0.08 ng L−1 for MeHg and iHg, res…
On the Way to Optoionics
2020
Discussions with Michael Grätzel, Ursula Röthlisberger, Robert A. Evarestov and Bettina V. Lotsch are gratefully acknowledged.
The role of collective action for the emergence and consolidation of democracy
2020
AbstractThe role of citizens' collective action for the emergence and consolidation of democracy is generally analysed within bottom-up theories. However, top-down theories show that elites might impede or promote both democracy and collective action through a set of strategies which are often unobserved and vary over time. Democratic persistence and change require then to be assessed in a dynamic framework which considers both citizens and elites' strategies. For such reason, on a large sample of countries in the period 1971–2014, we jointly estimate the probability of collective action and democracy using a Structural Dynamic Model. This allows us to account for the dynamic nature of the …
When Fiscal Consolidation Meets Private Deleveraging
2016
We analyze the interaction between fiscal consolidation and private-sector deleveraging in an economy within a monetary union. Pre-existing long term collateralized private debt – a core ingredient of the deleveraging process – plays a critical role in shaping fiscal multipliers. By buffering the short-run fall in debtors’ spending capacity, long-run private debt reduces the short-run multipliers of aggressive (large and/or fast) consolidations. However, absent credibility concerns, aggressive consolidations raise the intensity and length of private deleveraging, causing higher output losses over the medium run. In terms of discounted output losses and welfare, this latter effect dominates,…
The Concordance between Teachers’ and Parents’ Perceptions of School Transition Practices: A Solid Base for the Future
2015
This study focuses on parents’ and teachers’ perceptions of practices aimed at easing the transition to formal schooling (e.g., familiarization with the school, discussions about the school entrants). A total of 230 preschool teachers, 131 elementary school teachers, and 2,662 mothers and fathers filled in a questionnaire containing items on how important they considered different preschool-school transition practices. The participants considered the various transition practices to be at least somewhat important. On average, familiarization with the school was considered to be most important, whereas teacher co-operation and joint writing of curricula were considered to be least important. …
The consolidation of post‐autocratic democracies: A multi‐level model
1998
The mainstream of theoretical and empirical ‘consolidology’ speaks of consolidated and non‐consolidated democracies. This crude dichotomy does not allow for more differentiated judgments about the stage of consolidation of newly democratized political systems. To overcome this shortcoming, a multi‐level model of democratic consolidation is proposed, consisting of four interdependent levels. The particular configuration of each has specific impact on the consolidation of the other levels. The four levels are: constitutional, representative, behavioural, and civic cultural consolidation. This model helps us to understand why new democracies survive or collapse, to identify the degree to which…