Quantum noise and mixedness of a pumped dissipative non-linear oscillator

Evolutions of quantum noise, characterized by quadrature squeezing parameter and Fano factor, and of mixedness, quantified by quantum von Neumann and linear entropies, of a pumped dissipative non-linear oscillator are studied. The model can describe a signal mode interacting with a thermal reservoir in a parametrically pumped cavity with a Kerr non-linearity. It is discussed that the initial pure states, including coherent states, Fock states, and finite superpositions of coherent states evolve into the same steady mixed state as verified by the quantum relative entropy and the Bures metric. It is shown analytically and verified numerically that the steady state can be well approximated by a nonclassical Gaussian state exhibiting quadrature squeezing and sub-Poissonian statistics for the cold thermal reservoir. A rapid increase is found in the mixedness, especially for the initial Fock states and superpositions of coherent states, during a very short time interval, and then for longer evolution times a decrease in the mixedness to the same, for all the initial states, and relatively low value of the nonclassical Gaussian state.Comment: 10 pages, 12 figure

Effective Hamiltonians in quantum optics: a systematic approach

We discuss a general and systematic method for obtaining effective Hamiltonians that describe different nonlinear optical processes. The method exploits the existence of a nonlinear deformation of the usual su(2) algebra that arises as the dynamical symmetry of the original model. When some physical parameter, dictated by the process under consideration, becomes small, we immediately get a diagonal effective Hamiltonian that correctly represents the dynamics for arbitrary states and long times. We extend the technique to su(3) and su(N), finding the corresponding effective Hamiltonians when some resonance conditions are fulfilled.Comment: 13 Pages, no figures, submitted for publicatio

Singular projective varieties and quantization

By the quantization condition compact quantizable Kaehler manifolds can be embedded into projective space. In this way they become projective varieties. The quantum Hilbert space of the Berezin-Toeplitz quantization (and of the geometric quantization) is the projective coordinate ring of the embedded manifold. This allows for generalization to the case of singular varieties. The set-up is explained in the first part of the contribution. The second part of the contribution is of tutorial nature. Necessary notions, concepts, and results of algebraic geometry appearing in this approach to quantization are explained. In particular, the notions of projective varieties, embeddings, singularities, and quotients appearing in geometric invariant theory are recalled.Comment: 21 pages, 3 figure

Movilizaci?n participada en la construcci?n y uso del portafolio como estrategia did?ctica y evaluativa para la consolidaci?n de ambientes propicios en el aula de clases y el aprendizaje significativo a trav?s de la disciplina aut?noma en los estudiantes del grado sexto seis (6? -6) de la Instituci?n educativa t?cnica San Luis Gonzaga del corregimiento de Chicoral, municipio de Espinal, Tolima

199 P?ginasEn el ?mbito escolar, la Instituci?n Educativa T?cnica San Lu?s Gonzaga de Chicoral ha venido sufriendo el flagelo e incremento de la indisciplina que se vive al interior de sus aulas y que d?a a d?a toma mayor fuerza en el grado sexto seis (6?-6). La indisciplina es tan grande que los docentes ven interrumpidas sus labores acad?micas diarias, tratando de mantener el orden en el sal?n de clase, convirti?ndose ?ste aspecto en el m?s importante respecto al c?mo y qu? ense?ar a los estudiantes para que su aprendizaje sea verdaderamente significativo. Convencidos que el ambiente de aula debe ser el adecuado para que se d? un aprendizaje significativo y se fomente la disciplina aut?noma en los estudiantes del grado 6?-6, en quienes se genera conductas disruptivas en el aula debido a sus caracter?sticas particulares. Producto de ?sta situaci?n surge la pregunta ?C?mo generar ambientes de aula propicios para el aprendizaje significativo a trav?s de la disciplina aut?noma en ?stos estudiantes?, enmarcada bajo el objetivo general que lleva a proponer un modelo de intervenci?n que logre impactar en la comunidad educativa y que permita generar y lograr esos ambientes propicios y dem?s resultados esperados para dar soluci?n a la problem?tica que se vive, por medio de la reflexi?n. Para desarrollar el trabajo se emple? una metodolog?a de car?cter mixto, iniciando con la parte cualitativa para lograr el acercamiento entre el objeto de estudio y los sujetos involucrados; y luego para lograr la fiabilidad de los resultados se opt? por la metodolog?a cuantitativa. Con el an?lisis de la informaci?n se concluye que algunas de las causas que generan los malos ambientes y las conductas disruptivas, son entre otras las siguientes: el inadecuado manejo del tiempo libre y la escasa supervisi?n de los padres, carencia de h?bitos y t?cnicas de estudio, la mala alimentaci?n, el desinter?s de los estudiantes por el estudio, etc. Con base en ?stos resultados se pudo plantear la propuesta de intervenci?n denominada Movilizaci?n participada en la consolidaci?n de ambientes propicios en el aula de clases para el aprendizaje significativo a trav?s de la disciplina aut?noma de sus actores sociales.La Facultad de Ciencias de la Educaci?n de la Universidad del Tolima, el director, codirector y el jurado calificador, no son responsables de los conceptos ni de las ideas expuestas por los autores del presente trabajo. Art?culo 16, Acuerdo 032 de 1976 y Art?culo 29, Acuerdo 064 de 1991, Concejo Acad?mico de la Universidad del Tolima.INTRODUCCI?N 1. EL PROBLEMA DE LA INVESTIGACI?N 1.1 PLANTEAMIENTO DEL PROBLEMA DE INVESTIGACI?N 1.1.1 Descripci?n del Problema 1.1.2 Formulaci?n del Problema 1.1.3 Pregunta de Investigaci?n 2. OBJETIVOS 2.1 OBJETIVO GENERAL 2.2 OBJETIVOS ESPEC?FICOS 3. JUSTIFICACI?N 4. MARCO TE?RICO 4.1 EL AULA COMO LUGAR DE ENCUENTRO Y DESENCUENTRO 4.2 AMBIENTE EDUCATIVO Y ESTETICA SOCIAL 4.3 LOS AMBIENTES VIRTUALES. UN DESAFIO PARA LA EDUCACI?N 5. DISE?O METODOL?GICO 5.1 METODOLOG?A 5.2 TIPO DE ESTUDIO 5.3 ENFOQUE METODOL?GICO 5.4 POBLACI?N Y MUESTRA 5.5 T?CNICAS E INSTRUMENTOS DE RECOLECCI?N DE DATOS 5.6 AN?LISIS E INTERPRETACI?N DE DATOS 6. AN?LISIS DE RESULTADOS 6.1 AN?LISIS DE RESULTADOS DE LA CARACTERIZACI?N DE LOS AMBIENTES DE AULA, NIVEL DE APRENDIZAJE Y NIVEL DE DISCIPLINA QUE PRESENTAN LOS ESTUDIANTES 6.2 AN?LISIS ENCUESTAS A PADRES DE FAMILIA 6.3 AN?LISIS ENCUESTAS MAESTROS 6.4 AN?LISIS ENCUESTAS DIRECTIVOS DOCENTES 6.5 AN?LISIS DE LA ENTREVISTA SEMIESTRUCTURADA REALIZADA A LA PSICOORIENTADORA DE LA INSTITUCI?N EDUCATIVA T?CNICA SAN LU?S GONZAGA DEL CORREGIMIENTO DE CHICORAL, MUNICIPIO DE ESPINAL-TOLIMA. 6.6 AN?LISIS CONVERSATORIO CON DOCENTES QUE ORIENTAN CLASE EN EL GRADO 6?-6 DE LA INSTITUCI?N EDUCATIVA T?CNICA SAN LU?S GONZAGA. 6.7 AN?LISIS DIARIO DE CAMPO TRABAJADO CON LOS ESTUDIANTES PARA CORROBORAR SUS CONDUCTAS Y DESEMPE?OS ACAD?MICOS 7. PROPUESTA 7.1 NOMBRE DE LA PROPUESTA 7.2 INTRODUCCI?N 7.2.1 Legitimaci?n Social. 7.2.2 La Comunicaci?n. 7.2.3 Saber Social 7.2.4 Equidad Productiva. 7.2.5 Re-Editores Sociales 7.3 OBJETIVOS 7.3.1 Objetivo General 7.3.2 Objetivos Espec?ficos 7.4 JUSTIFICACI?N 7.5 MARCO TE?RICO. 7.5.1 Antecedentes Hist?ricos 7.6 MARCO CONCEPTUAL. 7.7 LA EVALUACI?N DE COMPETENCIAS COMPLEJAS: LA PR?CTICA DEL PORTAFOLIO 7.8 PAR?METROS GENERALES PARA ORGANIZAR EL PORTAFOLIO 7.9 EL APRENDIZAJE SIGNIFICATIVO Y EL PORTAFOLIO PEDAG?GICO. 7.10 METODOLOG?A DE LA PROPUESTA 7.11 CONCLUSIONES DE LA PROPUESTA 8. CONCLUSIONES 9. RECOMENDACIONES 9.1 RESIGNIFICACI?N PEI 9.2 JUSTIFICACI?N 9.3 FUTURAS INVESTIGACIONES REFERENCIAS ANEXO

A lattice estimate of the g_{D^* D pi} coupling

We present the results of the first direct determination of the g_{D^* D pi} coupling using lattice QCD. From our simulations in the quenched approximation, we obtain g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0} and hat(g) = 0.67 +/- 0.08^{+0.04}_{-0.06}. It is in agreement with a recent experimental result from CLEO.Comment: Lattice2002(heavyquark), 3 pages, 3 figure

Real-Time Synthesis is Hard!

We study the reactive synthesis problem (RS) for specifications given in Metric Interval Temporal Logic (MITL). RS is known to be undecidable in a very general setting, but on infinite words only; and only the very restrictive BRRS subcase is known to be decidable (see D'Souza et al. and Bouyer et al.). In this paper, we precise the decidability border of MITL synthesis. We show RS is undecidable on finite words too, and present a landscape of restrictions (both on the logic and on the possible controllers) that are still undecidable. On the positive side, we revisit BRRS and introduce an efficient on-the-fly algorithm to solve it

Surviving sepsis: going beyond the guidelines

The Surviving Sepsis Campaign is a global effort to improve the care of patients with severe sepsis and septic shock. The first Surviving Sepsis Campaign Guidelines were published in 2004 with an updated version published in 2008. These guidelines have been endorsed by many professional organizations throughout the world and come regarded as the standard of care for the management of patients with severe sepsis. Unfortunately, most of the recommendations of these guidelines are not evidence-based. Furthermore, the major components of the 6-hour bundle are based on a single-center study whose validity has been recently under increasing scrutiny. This paper reviews the validity of the Surviving Sepsis Campaign 6-hour bundle and provides a more evidence-based approach to the initial resuscitation of patients with severe sepsis

Design of a Database of Case Studies and Technologies to Increase the Diffusion of Low-Temperature Waste Heat Recovery in the Industrial Sector

The recovery of waste heat is a fundamental means of achieving the ambitious medium- and long-term targets set by European and international directives. Despite the large availability of waste heat, especially at low temperatures (<250 degrees C), the implementation rate of heat recovery interventions is still low, mainly due to non-technical barriers. To overcome this limitation, this work aims to develop two distinct databases containing waste heat recovery case studies and technologies as a novel tool to enhance knowledge transfer in the industrial sector. Through an in-depth analysis of the scientific literature, the two databases' structures were developed, defining fields and information to collect, and then a preliminary population was performed. Both databases were validated by interacting with companies which operate in the heat recovery technology market and which are possible users of the tools. Those proposed are the first example in the literature of databases completely focused on low-temperature waste heat recovery in the industrial sector and able to provide detailed information on heat exchange and the technologies used. The tools proposed are two key elements in supporting companies in all the phases of a heat recovery intervention: from identifying waste heat to choosing the best technology to be adopted

Systematic review of methodologies used to assess mastectomy flap viability

BACKGROUND Accurate prediction of mastectomy skin flap viability is vital as necrosis causes significant morbidity, potentially compromising results and delaying oncological management. Traditionally assessed by clinical judgement, a more objective evaluation can be provided using intraoperative imaging modalities. This systematic review aimed to compare all intraoperative techniques for assessment of mastectomy flap viability. METHODS A systematic literature review was performed using MEDLINE and Embase databases. Primary outcomes reported included specificity, sensitivity and predictive values of each test, and mean rates of mastectomy flap necrosis and reoperation. Secondary outcomes included cost analysis. RESULTS Some 18 studies were included. Designs were prospective cohort study (8), retrospective case series (4), prospective case series (3), retrospective case–control study (1), prospective pilot trial (1) and cost analysis study (1). The studies compared indocyanine green angiography (ICGA) (16 studies) and fluorescein dye angiography (FA) (3 studies) with clinical judgement. Sensitivity and specificity were highest for ICGA (5 studies) ranging from 38 to 100 and 68 to 91 per cent respectively. Both methods overpredicted necrosis. Mean rates of flap necrosis and reoperation decreased with ICGA (7·9 and 5·5 per cent respectively) and FA (3 and 0 per cent) compared with clinical judgement (19·4 and 12·9 per cent). Two studies were designed to define numerical parameters corresponding to perfusion using intraoperative techniques. Two studies performed a cost analysis for ICGA; one claimed a cost benefit and the other advocated its use in high‐risk patients only. CONCLUSION ICGA and FA are potentially useful tools for mastectomy flap assessment. However, the predictive accuracy is subject to the specific settings and model of equipment used. Current recommendations support their use in high‐risk patients

Comparison and relative utility of inequality measurements: as applied to Scotland’s child dental health

This study compared and assessed the utility of tests of inequality on a series of very large population caries datasets. National cross-sectional caries datasets for Scotland’s 5-year-olds in 1993/94 (n = 5,078); 1995/96 (n = 6,240); 1997/98 (n = 6,584); 1999/00 (n = 6,781); 2002/03 (n = 9,747); 2003/04 (n = 10,956); 2005/06 (n = 10,945) and 2007/08 (n = 12,067) were obtained. Outcomes were based on the d3mft metric (i.e. the number of decayed, missing and filled teeth). An area-based deprivation category (DepCat) measured the subjects’ socioeconomic status (SES). Simple absolute and relative inequality, Odds Ratios and the Significant Caries Index (SIC) as advocated by the World Health Organization were calculated. The measures of complex inequality applied to data were: the Slope Index of Inequality (absolute) and a variety of relative inequality tests i.e. Gini coefficient; Relative Index of Inequality; concentration curve; Koolman and Doorslaer’s transformed Concentration Index; Receiver Operator Curve and Population Attributable Risk (PAR). Additional tests used were plots of SIC deciles (SIC10) and a Scottish Caries Inequality Metric (SCIM10). Over the period, mean d3mft improved from 3.1(95%CI 3.0–3.2) to 1.9(95%CI 1.8–1.9) and d3mft = 0% from 41.1(95%CI 39.8–42.3) to 58.3(95%CI 57.8–59.7). Absolute simple and complex inequality decreased. Relative simple and complex inequality remained comparatively stable. Our results support the use of the SII and RII to measure complex absolute and relative SES inequalities alongside additional tests of complex relative inequality such as PAR and Koolman and Doorslaer’s transformed CI. The latter two have clear interpretations which may influence policy makers. Specialised dental metrics (i.e. SIC, SIC10 and SCIM10) permit the exploration of other important inequalities not determined by SES, and could be applied to many other types of disease where ranking of morbidity is possible e.g. obesity. More generally, the approaches described may be applied to study patterns of health inequality affecting worldwide populations