879 research outputs found
Fractura vertebral torácica en espondilitis anquilosante: importancia de la cuarta columna y consideraciones terapéuticas
Las fracturas por cizallamiento de la columna torácica con afectación de las tres columnas son
altamente inestables y requieren fijación quirúrgica para evitar deterioro neurológico. Los pacientes con espondilitis anquilosante (EA) son susceptibles a este tipo de fracturas con traumatismos mínimos. Presentamos el caso
de un varón de 72 años con EA que sufrió una fractura de la columna torácica por cizallamiento afectando a las
tres columnas. La fractura paso desapercibida y el paciente estuvo durante dos meses sin ningún tratamiento.
Sorprendentemente no se produjo lesión neurológica en este tiempo a pesar de realizar deambulación sin ortesis
externa. Se propone el concepto de cuarta columna como posible estabilizador en este caso y se discuten las características del manejo diagnóstico y tratamiento terapéuticoShear fractures affecting the three columns at the thoracic spine are highly instable and require
surgical stabilization to avoid neurological injury. Patients with Ankylosing Spondylitis (AS) are at risk to sustain
this type of fracture even with minor trauma. We present the case of a 72 years old male with AS who suffered
a shear fracture of the thoracic spine involving all three columns. The injury was overlooked and the patient did
not receive any treatment for two months. Surprisingly the patient did not develop neurological injury although
he maintained his daily activities without external support. We propose the concept of fourth column as a stabilizer frame in this particular case and the management aspects concerning diagnosis and therapeutic treatment
are discussed
Improved determination of the 1(0)-0(0) rotational frequency of NH3D+ from the high resolution spectrum of the v4 infrared band
The high resolution spectrum of the v4 band of NH3D+ has been measured by
difference frequency IR laser spectroscopy in a multipass hollow cathode
discharge cell. From the set of molecular constants obtained from the analysis
of the spectrum, a value of 262817(6) MHz (3sigma) has been derived for the
frequency of the 1(0)-0(0) rotational transition. This value supports the
assignment to NH3D+ of lines at 262816.7 MHz recorded in radio astronomy
observations in Orion-IRc2 and the cold prestellar core B1-bS.Comment: Accepted for publication in the Astrophysical Journal Letters 04 June
201
Las modificaciones de la tasa de cloruros sanguíneos y de la reserva alcalina en la oclusión intestinal experimental
Papel del tubo digestivo en la concentración globular y en las variaciones de cloro y sodio del shoc histamínico
Relaciones entre las variaciones de la reserva alcalina y la tasa de cloro y sodio sanguíneo en la obstrucción intestinal experimental
A Rational Expectations Model for Simulation and Policy Evaluation of the Spanish Economy
This paper describes a Rational Expectations Model of the Spanish economy, REMS, which is in the tradition of small open economy dynamic general equilibrium models, with a strongly microfounded system of equations. The model is built on standard elements, but incorporates some distinctive features to provide an accurate description of the Spanish economy. We contribute to the existing models of the Spanish economy by adding search and matching rigidities to a small open economy framework. Our model also incorporates habits in consumption and rule-of-thumb households. As Spain is a member of EMU, we model the interaction between a small open economy and monetary policy in a monetary union. The model is primarily constructed to serve as a simulation tool at the Spanish Ministry of Economic Affairs and Finance. As such, it provides a great deal of information regarding the transmission of policy shocks to economic outcomes. The paper describes the structure of the model in detail, as well as the estimation and calibration technique and some examples of simulations.general equilibrium, rigidities, policy simulations
Generation of new power processing structures exploiting genetic programming
This paper describes the use of genetic algorithms to generate power processing circuits. In order to speed up the algorithm, the fitness of the circuits is evaluated using an explicit integration method based on the 4th order Adams–Bashforth formula. Different combinations of genetic primitives for the crossover and mutation processes have been tested. The algorithm is demonstrated by generating new structures of voltage multipliers, which specifically focus on energy harvesting systems. These systems require low input voltages, usually under the diode threshold value. The Adams–Bashforth method allows to achieve a simulation time that is about five times faster than that of SPICE-based simulations.This work was partially funded by Spanish government project TEC2015-66878-C3-2-R (MINECO/FEDER, UE)
Extending the applicability of an open-ring trap to perform experiments with a single laser-cooled ion
An open-ring ion trap, also referred to as transparent trap was initially
built up to perform - correlation experiments with radioactive
ions. This trap geometry is also well suited to perform experiments with
laser-cooled ions, serving for the development of a new type of Penning trap,
in the framework of the project TRAPSENSOR at the University of Granada. The
goal of this project is to use a single Ca ion as detector for
single-ion mass spectrometry. Within this project and without any modification
to the initial electrode configuration, it was possible to perform Doppler
cooling on Ca ions, starting from large clouds and reaching single
ion sensitivity. This new feature of the trap might be important also for other
experiments with ions produced at Radioactive Ion Beam (RIB) facilities. In
this publication, the trap and the laser system will be described, together
with their performance with respect to laser cooling applied to large ion
clouds down to a single ion.Comment: 9 pages, 13 figure
Stability and efficiency of explicit integration in interconnect analysis on GPUs
This paper presents a technique to parallelise a numeric integration solver on general purpose GPU. The technique is based on the combination of space state modeling with an explicit integration method based on the Adams-Bashforth second order formula. The paper studies the stability of variable step explicit method and proposes a technique to guarantee integration stability using this technique. Although explicit methods require smaller integration steps compared to the traditional implicit techniques, they avoid the complex calculations on large which are used to solve the last ones. The technique is demonstrated simulating an RC model of an VLSI interconnect. Results achieved by the proposed variable step explicit method is compared to those achieved by a traditional implicit integration based simulator like Ngspice. The results show that the parallelised explicit solution is one order of
magnitude faster than the implicit one for increasingly complex circuits.This work has been partially funded by Spanish government through
project RTI2018-097088-B-C33 (MINECO/FEDER, UE) and by EPSRC
(the UK Engineering and Physical Sciences Research Council) under grant
EP/N0317681/1. The research stay at The University of Southampton has been
supported by Fundacion Séneca-Agencia de Ciencia y Tecnología de la Región
de Murcia, Programa Regional de Movilidad, Colaboración e Intercambio de
Conocimiento Jimenez de la Espada under grant 21187/EE/1
- …