Search results for "CONST"
showing 10 items of 7706 documents
Catalytic hydrothermal liquefaction of municipal sludge assisted by formic acid for the production of next-generation fuels
2021
Abstract Hydrothermal liquefaction (HTL) of municipal sludge (MS) was studied at 325 °C and 30 min at 10 and 30% w/w concentration of MS using formic acid (FA) as a green liquid hydrogen donor both in the absence and in the presence of heterogeneous catalysts. Pellets of commercial NiMo/Al2O3, CoMo/Al2O3 and felt of activated carbon ACF 1600 were used as catalysts. The addition of FA at high MS loading allowed to increase the yields in BC from 41 to 62% and its H/C ratio from 1.80 to 2.01 leading to energy recovery (ER) higher than 100%.When heterogeneous catalysts were used together with FA, a marked improvement of BC yields and quality was obtained at 10% MS loading. This behavior was not…
A new current-mode control for DC/DC converter
2005
Current-sensing is used widely in smart power chips, especially in DC/DC converter for voltage regulator modules (VRM), implemented with interleaved synchronous rectifier buck converters. The interleaved technique main difficulty is due to its current-sharing control between the several modules. Besides, if the used control technique is current-mode type, it is necessary create a ramp signal proportional to current on the inductor. In this paper, a lossless current-sensing method, solving the major disadvantages of the current-mode control and implementing a current-sharing technique, is proposed. This innovative technique is tested in a two-module interleaved buck converter.
La deposición de Fotino de Sirmio
1998
Gonzalo.Fernandez@uv.es Este artículo estudia la condena y deposición del obispo Fotino de Sirmio en los años 346 y 347 d.C. Las fuentes principales son Código Teodosiano, Epifanio de Salamina (Panarion Haereticon), Nestorio de Constantinopla (Sermo XII), Hilario de Poitiers (Fragrnenta Historica), Atanasio de Alejandría (Apologia confra arianos e Historia arianorum ad monachos), Sozomeno (Historia Ecciesiastica), Libanio de Antioquía (Oratio XVIII) y Sócrates (Historia Ecclesiastica). Ibis article deals with Bishop Photin of Sirmiums sentence and deposition in years 346 and 347 AD. The main sources are Theodosian Code, Epiphanius of Salamis (Panarion Haereticon), Nestorius of Constantinopl…
Visco-elastic behavior through fractional calculus: an easier method for best fitting experimental results
2011
In capturing visco-elastic behavior, experimental tests play a fundamental rule, since they allow to build up theoretical constitutive laws very useful for simulating their own behavior. The main challenge is representing the visco-elastic materials through simple models, in order to spread their use. However, the wide used models for capturing both relaxation and creep tests are combinations of simple models as Maxwell and/or Kelvin, that depend on several parameters for fitting both creep and relaxation tests. This paper, following Nutting and Gemant idea of fitting experimental data through a power law function, aims at stressing the validity of fractional model. In fact, as soon as rela…
On the numerical implementation of a 3D fractional viscoelastic constitutive model
2015
The aim of this paper is the implementation of a 3D fraction al viscoelastic constitutive law in a user material subroutine (UMAT) in the finite element software Abaqus. Essential to the implementation of the model is access to the strain history at each Gauss point of each element in a constructive manner. Details of the UMAT and comparison with some analytical results are presented in order to show that the fractional viscoelastic constitutive law has been successfully implemented.
Masonry structures: A proposal of analytical generation of fragility functions for tsunami impact – Application to the Mediterranean coasts
2021
Abstract Evaluation of tsunami vulnerability of coastal buildings is gaining high interest in recent years in the areas with high tsunami hazard. Fragility evaluation is a fundamental step to obtain a quantitative estimation of the probability of building damage and in order to define possible strategies for risk mitigation. Several empirical fragility curves are available for masonry structures. However, an empirical fragility curve is generally based on field surveys after tsunami events, not always available. Conversely, analytical fragility curves are based on prediction approaches. In this paper, a proposal for the evaluation of analytical fragility curves for masonry structures typica…
Il ruolo del Consiglio costituzionale francese nella definizione del nuovo stato di emergenza sanitaria
2020
The aim of this paper is to share some observations on the role of the French Constitutional Court in the management of the health emergency caused by Sars-CoV-19. Particularly, to examine the Decision n. 799-2020, in which the Court ruled on the constitutional conformity of the organic law 30 March 2020, which declared the suspension of deadlines to transmit and decide on the priority issue of constitutionality (QPC). With the subsequent Decision n. 800-2020 the Constitutional Court ruled on the legitimacy of the law which extended the state of emergency until the 10th of July. Both Decisions offer insights into the relationship between the Constitutional Court as well as the protection of…