Search results for "Solid"

Optimal design of tuned liquid column dampers for seismic response control of base-isolated structures

2017

In this paper, the use of a tuned liquid column damper (TLCD) as a cost-effective means to control the seismic response of a base-isolated structure is studied. A straightforward direct approach for the optimal design of such a device is proposed, considering a white noise model of the base excitation. On this base, a direct optimization procedure of the TLCD design parameters is performed and optimal design charts are presented as a ready-to-use practical design tool. Comparison with the optimal parameters obtained considering a classical iterative statistical linearization technique proves the reliability of the proposed approach. The performance of the base-isolated TLCD-controlled struc…

Optimal Bounds on Plastic Deformations for Bodies Constituted of Temperature-Dependent Elastic Hardening Material

1997

Bounds are investigated on the plastic deformations in a continuous solid body produced during the transient phase by cyclic loading not exceeding the shakedown limit. The constitutive model employs internal variables to describe temperature-dependent elastic-plastic material response with hardening. A deformation bounding theorem is proved. Bounds turn out to depend on some fictitious self-stresses and mechanical internal variables evaluated in the whole structure. An optimization problem, aimed to make the bound most stringent, is formulated. The Euler-Lagrange equations related to this last problem are deduced and they show that the relevant optimal bound has a local character, i.e., it …

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

2009

Organic semiconducting materials offer the advantage of solution processability into flexible films. In most cases, their drawback is based on their low charge carrier mobility, which is directly related to the packing of the molecules both on local (amorphous versus crystalline) and on macroscopic (grain boundaries) length scales. Liquid crystalline ordering offers the possibility of circumventing this problem. An advanced concept comprises: i) the application of materials with different liquid crystalline phases, ii) the orientation of a low viscosity high temperature phase, and, iii) the transfer of the macroscopic orientation during cooling to a highly ordered (at best, crystalline-like…

Efficient blue emitting organic light emitting diodes based on fluorescent solution processable cyclic phosphazenes

2008

Solution processable blue fluorescent dendrimers based on cyclic phosphazene (CP) cores incorporating amino-pyrene moieties have been prepared and used as emissive layers in organic light emitting diodes (OLEDs). These dendrimers have high glass transition temperatures, are monodisperse, have high purity via common chromatographic techniques, and form defect-free amorphous films via spin/dip coating. The solution processable blue light emitting OLEDs reach current efficiencies of 3.9 cd/A at brightness levels near 1000 cd/m2. Depending on the molecular bridge used to attach the fluorescent dendron to the inorganic core, the emission wavelength changes from 470 to 545 nm, corresponding to bl…

Phosphorescent hybrid organic-inorganic light-emitting diodes.

2010

Organic consumption and consumer participation in food community networks

2012

Due to improvements in welfare, new food consumption concerns have emerged in Europe. Such concerns go beyond issues related to food safety and market prices. Solidarity Purchasing Groups (GASs) are one way to combine utilitarian and ethical aspects: in these groups the trade in organic products predominates. The aim of GAS groups is to primarily develop a local economy which is both ethical and fair, providing networks of economic solidarity through social relations and economic-territorial districts. This paper sets out to determine the profiles of the consumer groups that constitute GASs in Sicily (southern Italy) in order to search for key elements of the movement in terms of both commu…

Varieties of Liberalization and the New Politics of Social Solidarity, by Kathleen Thelen. Cambridge University Press, Cambridge, 2014, 264 pp., ISBN…

2015

Comparison of stir bar sorptive extraction in the liquid and vapour phases, solvent-assisted flavour evaporation and headspace solid-phase microextra…

2017

The volatile fraction plays an important role on the organoleptic properties and overall acceptability of fruit juices. This work reports for first time a non-targeted approach for the analysis of the volatile fraction of fruit juice by stir bar sorptive extraction (SBSE[1]) in liquid and vapour phase (HSSE[2]) at three extraction times (30, 60, and 120 min), two temperatures (room temperature and 40 °C), and two sample volumes (5 and 10 mL). The resultant volatile profiles were compared with solvent-assisted flavour evaporation (SAFE[3]) and headspace solid-phase microextraction (HS-SPME[4]). SBSE and HSSE enabled the detection and identification of more compounds than HS-SPME and less tha…

La alteridad en el discurso de la ciencia ficción : identidad y desarraigo en Beforeigners (HBO: 2019- )

2021

La representación del miedo hacia el Otro ha sido una de las temáticas más recurrentes en el género de la ciencia ficción. En esta línea, esta investigación articula un análisis de la serie noruega Beforeigners en torno al discurso de la identidad. Desde una perspectiva cualitativa, se ha realizado un análisis textual que ha puesto de manifiesto que en la serie prevalecen los valores comunitarios y solidarios. En la discusión se han contrapuestos los resultados con otras series del género y se ha evidenciado que la serie rompe con las narrativas típicas de la ciencia ficción. Asimismo, se destaca el tono crítico de la serie hacia las políticas de inmigración de la Unión Europea. The portray…

Ab initio study of phase competition in (La1−c,Src)CoO3 solid solutions

2013

Abstract (La 1 − c ,Sr c )CoO 3 (LSC) solid solutions are promising materials for high temperature electrochemical cells and cathodes of solid oxide fuel cells. The Density Functional Theory (DFT) was applied to calculate the energies of the different superstructures in LSC which are stable with respect to formation of anti-phase domains. The energy parameters determining the relative stability of the cubic superstructures (phases) are extracted from these calculations. Using the Concentration Wave formalism and the energy parameters for different phases from DFT calculations, the temperature dependences of the long-range order parameters were obtained characterizing the order–disorder tran…