503 research outputs found
Time and memory: Camí de sirga and Les veus del Pamano
In this article, I will examine how historical memory is recovered and, in particular, how the issue of time is dealt with. I will explore how literary language, with its ability to penetrate and create contaminated situations, is the most suitable vehicle for presenting historical memory in a less ideological and emotional way and how it offers a means of reconstructing, filling in or setting straight the records provided in official accounts. Finally, I will argue that literature can be used to recover or recreate these official accounts and, in so doing, to give voice to previously suppressed memories, figures and realities
Lecturas polifónicas de los epistolarios de Jorge Guillén y Pedro Salinas
This article addresses Jorge Guillén and Pedro Salinas’ epistolary voice, two fundamental poets in the renewal of Spanish literature around 1927. Both excelled in their letter writing activity. The article discusses some of the similarities and differences we can detect in their correspondence, especially in the letters Guillén sent to his wife, Germaine Cahen, and the letters of Pedro Salinas in general. Letter writing, together with prose and poetry, is a significant part of Guillén and Salinas’ literary and vital projects, and it helps us better know hidden aspects of their writing. Salinas expresses a “perfect forever”, while Guillén is close to a “real human tremor”
Cross sections for the excitation of isovector charge-exchange resonances in 208Tl
The Glauber approximation for the treatment of heavy-ion scattering, has
already been shown to give reliable predictions for the reaction cross section
in the particular case of intermediate energy charge-exchange processes. In the
present work, we couple a Glauber-type model to microscopic Random Phase
Approximation calculations of the charge-exchange excitations of Pb.
The aim is to solve the longstanding question whether the very elusive
charge-exchange isovector monopole has been really identified in the past
experiments, or other multipoles were prevalent in the observed spectra.Comment: text + 4 figures; accepted for publication in Phys. Rev.
AC VS. DC flash sintering: Influence of field frequency on flash processes
Please click Additional Files below to see the full abstract
A comparative study of magnetic and electrical properties of BiFeO3 mutiferroic ceramics sintered by electric field assisted-methods: Spark plasma sintering and flash sintering
Please click Additional Files below to see the full abstract
Reaction flash sintering for producing high quality functional ceramics within seconds
For ceramic materials, it has been recently shown in literature that applying a small electric field and a small DC current through a sample produces sudden sintering (within seconds) at relatively low temperatures. This method is known as Flash Sintering and it has been applied to number of materials. In this work it is shown that both chemical reaction and sintering can be combined into a single flash sintering experiments. This new approach is known as Reaction Flash Sintering. To demonstrate the feasibility of this method, a multiferroic material, BiFeO3, is prepared from a stoichiometric mixture of Bi2O3 and Fe2O3 oxides. Thus, in a single process, dense nanostructured BiFeO3 ceramics are obtained by applying an electric field of 50 V cm-1 and with a current limit of 35 mA mm-2 within seconds at a furnace temperature of about 625 °C. The resulting materials were pure-phase perovskites without any evidence of secondary phases, sillenite or mullite, that are commonly present in materials prepared by conventional procedures. Moreover, samples were electrically insulating, as measured by complex impedance spectroscopy.
It is shown here that the synthesis of pure single-phase ceramics of complex oxides from stoichiometric mixtures of single oxides is possible by reaction flash sintering, even for materials difficult to prepare by conventional procedures. This discovery is a breakthrough in materials preparation
Swarm hybrid optimization for a piecewise model fitting applied to a glucose model
[EN] Purpose ¿ The purpose of this paper is to study insulin pump therapy and accurate monitoring of glucose
levels in diabetic patients, which are current research trends in diabetology. Both problems have a wide
margin for improvement and promising applications in the control of parameters and levels involved.
Design/methodology/approach ¿ The authors have registered data for the levels of glucose in diabetic
patients throughout a day with a temporal resolution of 5 minutes, the amount and time of insulin
administered and time of ingestion. The estimated quantity of carbohydrates is also monitored. A
mathematical model for Type 1 patients was fitted piecewise to these data and the evolution of the parameters
was analyzed.
Findings ¿ They have found that the parameters for the model change abruptly throughout a day for the
same patient, but this set of parameters account with precision for the evolution of the glucose levels in the
test patients. This fitting technique could be used to personalize treatments for specific patients and predict
the glucose-level variations in terms of hours or even shorter periods of time. This way more effective insulin
pump therapies could be developed.
Originality/value ¿ The proposed model could allow for the development of improved schedules on
insulin pump therapiesAcedo Rodríguez, L.; Botella, M.; Cortés, J.; Hidalgo, J.; Maqueda, E.; Villanueva Micó, RJ. (2018). Swarm hybrid optimization for a piecewise model fitting applied to a glucose model. Journal of Systems and Information Technology. 20(4):9618-9627. https://doi.org/10.1108/JSIT-10-2017-0103S9618962720
Active and reactive power control based on predictive voltage control in a six-phase generation system using modular matrix converters
- …