Controlling Excitations Inversion of a Cooper Pair Box Interacting with a Nanomechanical Resonator

We investigate the action of time dependent detunings upon the excitation inversion of a Cooper pair box interacting with a nanomechanical resonator. The method employs the Jaynes-Cummings model with damping, assuming different decay rates of the Cooper pair box and various fixed and t-dependent detunings. It is shown that while the presence of damping plus constant detunings destroy the collapse/revival effects, convenient choices of time dependent detunings allow one to reconstruct such events in a perfect way. It is also shown that the mean excitation of the nanomechanical resonator is more robust against damping of the Cooper pair box for convenient values of t-dependent detunings.Comment: 11 pages, 5 figure

Osteosarcoma extraesquelético. Caso clínico.

El osteosarcoma extraesquelético es un tumor maligno de partes blandas poco frecuente. Es una causa rara de osificación en partes blandas que se distingue de otras entidades por las características clínicas, los estudios de imagen y los exámenes anatomopatológicos. Presentamos un caso clínico en un varón de 64 años, a nivel de muslo. Se realiza una revisión de la bibliografía, señalando las principales características de esta entidad.Extraskeletal osteosarcoma is a rare malignant soft-tissue neoplasm. The clinical feature, imaging studies findings and histologic patterns allow the diferential diagno- sis with other entities. We report a case of a 64 years old man who had this tumour in his thigh. We make a review of litera- ture

Sustainable growth in complex networks

Based on the empirical analysis of the dependency network in 18 Java projects, we develop a novel model of network growth which considers both: an attachment mechanism and the addition of new nodes with a heterogeneous distribution of their initial degree, $k_0$. Empirically we find that the cumulative degree distributions of initial degrees and of the final network, follow power-law behaviors: $P(k_{0}) \propto k_{0}^{1-\alpha}$, and $P(k)\propto k^{1-\gamma}$, respectively. For the total number of links as a function of the network size, we find empirically $K(N)\propto N^{\beta}$, where $\beta$ is (at the beginning of the network evolution) between 1.25 and 2, while converging to $\sim 1$ for large $N$. This indicates a transition from a growth regime with increasing network density towards a sustainable regime, which revents a collapse because of ever increasing dependencies. Our theoretical framework is able to predict relations between the exponents $\alpha$, $\beta$, $\gamma$, which also link issues of software engineering and developer activity. These relations are verified by means of computer simulations and empirical investigations. They indicate that the growth of real Open Source Software networks occurs on the edge between two regimes, which are either dominated by the initial degree distribution of added nodes, or by the preferential attachment mechanism. Hence, the heterogeneous degree distribution of newly added nodes, found empirically, is essential to describe the laws of sustainable growth in networks.Comment: 5 pages, 2 figures, 1 tabl

Application of Adult Learning Theory to Supplemental Instruction in Undergraduate Chemistry Classes

The Supplemental Instruction (SI) program relies on the foundations of adult education. In particular it depends heavily on peer support in difficult classes. The andragogical approach highlights the importance of addressing different learning styles and helps students to engage in collaborative learning and problem solving

Hole burning in a nanomechanical resonator coupled to a Cooper pair box

We propose a scheme to create holes in the statistical distribution of excitations of a nanomechanical resonator. It employs a controllable coupling between this system and a Cooper pair box. The success probability and the fidelity are calculated and compared with those obtained in the atom-field system via distinct schemes. As an application we show how to use the hole-burning scheme to prepare (low excited) Fock states.Comment: 7 pages, 10 figure

The new Mars climate database

Not available

Endocistectomía como tratamiento quirúrgico de elección en hidatidosis muscular primaria: caso clínico

Se presenta el caso clínico de una hidatidosis muscular primaria localizada a nivel del vasto externo del cuádriceps, describiéndose los hallazgos clínicos, analíticos y de estudios de imagen característicos. Y a propósito del mismo se describe y defiende el tratamiento mediante endocistectomía y albendazol, que permite mantener la funcionalidad completa del músculo. A los dos años de evolución la paciente se encuentra asintomática.We report a case of primary hydatíd disease. It ¡s located in the vastus lateralís of the quadriceps. We describe the clinical, serological and radiological features of this dísease. And then we argüe for the use of the surgical endocystectomy and albendazol as the best treatment; thinking that this allows to sustain the complete function of the muscle. Two years later, the patient is asymptomatic

Pseudotumor tras cirugía de revisión por rotura de cabeza cerámica en una artroplastia total de cadera con par cerámica-cerámica: caso clínico

Se presenta un caso clínico con una importante y precoz metalosis, tan solo tres meses después de la revisión de una artroplastia total de cadera primaria par cerámica-cerámica, en la que se había roto la cabeza cerámica, y en la revisión se sustituyó por un par metal-polietileno. Catorce meses después apareció un pseudotumor causado por la metalosis por rotura de la cabeza metálica, por lo que se realizó una nueva revisión utilizando un par metal-metal preservando el vástago femoral que estaba perfectamente anclado aunque el cono Morse tenía una pequeña agresión. Dos años después de esta última cirugía los resultados son satisfactorios.We report a case presenting an important and early metallosis. Three months after a total hip arthroplasty primary using ceramic-ceramic pair, the patient sustained ceramic head fracture was revised to a metal-on-polyethylene articulation. Fourteen months later, a metallosis pseudotumor caused by the fracture of the metal head was observed. The patient was then revised to a metal-metal pair preserving the femoral component since it was well anchored while the Morse cone connection had a small impact. Two years after the last surgery the results are satisfactory

The latest (version 4.3) Mars Climate Database

Introduction: The Mars Climate Database (MCD) is a database of meteorological fields derived from General Circulation Model (GCM) numerical simulations of the Martian atmosphere and validated using available observational data. The MCD includes complementary post-processing schemes such as high spatial resolution interpolation of environmental data and means of reconstructing the variability thereof. The GCM is developed at Laboratoire de Météorologie Dynamique du CNRS (Paris, France) [1,2] in collaboration with the Open University (UK), the Oxford University (UK) and the Instituto de Astrofisica de Andalucia (Spain) with support from the European Space Agency (ESA) and the Centre National d'Etudes Spatiales (CNES)

Mars Climate Database version 5

The Mars Climate Database (MCD) is a database of meteorological fields derived from General Circulation Model (GCM) numerical simulations [2,4] of the Martian atmosphere and validated using available observational data. The MCD includes complementary post-processing schemes such as high spatial resolution interpolation of environmental data and means of reconstructing the variability thereof. The GCM is developed at LMD (Laboratoire de Météorologie Dynamique, Paris, France) in collaboration with several teams in Europe: LATMOS (Laboratoire Atmosphères, Milieux, Observations Spatiales, Paris, France), the Open University (UK), the Oxford University (UK) and the Instituto de Astrofisica de Andalucia (Spain) with support from the European Space Agency (ESA) and the Centre National d'Etudes Spatiales (CNES). The MCD is freely distributed and intended to be useful and used in the framework of engineering applications as well as in the context of scientific studies which require accurate knowledge of the state of the Martian atmosphere. The Mars Climate Database (MCD) has over the years been distributed to more than 150 teams around the world. With the many improvements implemented in the GCM over the last few years, a new series of reference simulations have been run and compiled in a new version (version 5) of the Mars Climate Database, released in the first half of 2012