Hyperfine interactions and nuclear structure

An automatic experimental apparatus for perturbed angular correlation measurements, capable of incorporating Ge(Li) detectors as well as scintillation counters, has been constructed.

The gamma-gamma perturbed angular correlation technique has been used to measure magnetic dipole moments of several nuclear excited states in the osmium transition region. In addition, the hyperfine magnetic fields, experienced by nuclei of 'impurity' atoms embedded in ferromagnetic host lattices, have been determined for several '4d' and '5d' impurity atoms.

The following magnetic dipole moments were obtained in the osmium transition region μ_2⁺(¹⁹⁰Os) = 0.54 ± 0.06 nm μ_4⁺(¹⁹⁰Os) = 0.88 ± 0.48 nm μ_2⁺(¹⁹²Os) = 0.56 ± 0.08 nm μ_2⁺(¹⁹²Pt) = 0.56 ± 0.06 nm μ_2^+’(¹⁹²Pt) = 0.62 ± 0.14 nm.

These results are discussed in terms of three collective nuclear models; the cranking model, the rotation-vibration model and the pairing-plus-quadrupole model. The measurements are found to be in satisfactory agreement with collective descriptions of low lying nuclear states in this region.

The following hyperfine magnetic fields of 'impurities' in ferromagnetic hosts were determined; H_int(Cd Ni) = - (64.0 ± 0.8)kG H_int(Hg Fe) = - (440 ± 105)kG H_int(Hg Co) = - (370 ± 78)kG H_int(Hg Ni) = - (86 ± 22)kG H_int(Tl Fe) = - (185 ± 70)kG H_int(Tl Co) = - (90 ± 35)kG H_int(Ra Fe) = - (105 ± 20)kG H_int(Ra Co) = - (80 ± 16)kG H_int(Ra Ni) = - (30 ± 10)kG, where in H_int(AB); A is the impurity atom embedded in the host lattice B. No quantitative theory is available for comparison. However, these results are found to obey the general systematics displayed by these fields. Several mechanisms which may be responsible for the appearance of these fields are mentioned.

Finally, a theoretical expression for time-differential perturbed angular correlation measurement, which duplicates experimental conditions is developed and its importance in data analysis is discussed.

Stationary random response of multidegree-of-freedom systems

An approximate approach is presented for determining the stationary random response of a general multidegree-of-freedom nonlinear system under stationary Gaussian excitation. This approach relies on defining an equivalent linear system for the nonlinear system. Two particular systems which possess exact solutions have been solved by this approach, and it is concluded that this approach can generate reasonable solutions even for systems with fairly large nonlinearities. The approximate approach has also been applied to two examples for which no exact or approximate solutions were previously available.

Also presented is a matrix algebra approach for determining the stationary random response of a general multidegree-of-freedom linear system. Its derivation involves only matrix algebra and some properties of the instantaneous correlation matricies of a stationary process. It is therefore very direct and straightforward. The application of this matrix algebra approach is in general simpler than that of commonly used approaches.

Weighted least-squares phase unwrapping algorithm based on derivative variance correlation map

Among different phase unwrapping approaches, the weighted least-squares minimization methods are gaining attention. In these algorithms, weighting coefficient is generated from a quality map. The intrinsic drawbacks of existing quality maps constrain the application of these algorithms. They often fail to handle wrapped phase data contains error sources, such as phase discontinuities, noise and undersampling. In order to deal with those intractable wrapped phase data, a new weighted least-squares phase unwrapping algorithm based on derivative variance correlation map is proposed. In the algorithm, derivative variance correlation map, a novel quality map, can truly reflect wrapped phase quality, ensuring a more reliable unwrapped result. The definition of the derivative variance correlation map and the principle of the proposed algorithm are present in detail. The performance of the new algorithm has been tested by use of a simulated spherical surface wrapped data and an experimental interferometric synthetic aperture radar (IFSAR) wrapped data. Computer simulation and experimental results have verified that the proposed algorithm can work effectively even when a wrapped phase map contains intractable error sources. (c) 2006 Elsevier GmbH. All rights reserved.

Bassenthwaite Lake: a general assessment of environmental and biological features and their susceptibility to change

Bassenthwaite (Lake) is one of the larger Cumbrian lakes, certainly one of the most distinctive, and of considerable conservation and amenity value. Although its shores lack sizeable settlements, its main inflow receives sewage effluent from a major tourist centre (Keswick) and is subject to episodic floods. These influences, the growing development of leisure activities at the lake (e.g. sailing, time-share units), and recent road-construction, have led to past appraisals of ecological impacts and lake management. The lake has not been the subject of intense and long-term ecological study, but much scattered information exists that is relevant to future management decisions. In the present Report, commissioned by North West Water, such information - published and unpublished - is surveyed. Especial attention is given to evidence bearing on susceptibility to change, affecting the lake environment and its biota or species of conservation interest. Extensive use has been made of the results of a recent (1986-7) seasonal survey by the FBA.

A general assessment of environmental and biological features of Windermere and their susceptibility to change

Bassenthwaite (Lake) is one of the larger Cumbrian lakes, certainly one of the most distinctive, and of considerable conservation and amenity value. Although its shores lack sizeable settlements, its main inflow receives sewage effluent from a major tourist centre (Keswick) and is subject to episodic floods. These influences, the growing development of leisure activities at the lake (e.g. sailing, time-share units), and recent road-construction, have led to past appraisals of ecological impacts and lake management. The lake has not been the subject of intense and long-term ecological study, but much scattered information exists that is relevant to future management decisions. In the present Report, commissioned by North West Water, such information - published and unpublished - is surveyed. Especial attention is given to evidence bearing on susceptibility to change, affecting the lake environment and its biota or species of conservation interest. Extensive use has been made of the results of a recent (1986-7) seasonal survey by the FBA.

The statistical bootstrap model

A review is presented of the statistical bootstrap model of Hagedorn and Frautschi. This model is an attempt to apply the methods of statistical mechanics in high-energy physics, while treating all hadron states (stable or unstable) on an equal footing. A statistical calculation of the resonance spectrum on this basis leads to an exponentially rising level density ρ(m) ~ cm^-3 e^βom at high masses.

In the present work, explicit formulae are given for the asymptotic dependence of the level density on quantum numbers, in various cases. Hamer and Frautschi's model for a realistic hadron spectrum is described.

A statistical model for hadron reactions is then put forward, analogous to the Bohr compound nucleus model in nuclear physics, which makes use of this level density. Some general features of resonance decay are predicted. The model is applied to the process of NN annihilation at rest with overall success, and explains the high final state pion multiplicity, together with the low individual branching ratios into two-body final states, which are characteristic of the process. For more general reactions, the model needs modification to take account of correlation effects. Nevertheless it is capable of explaining the phenomenon of limited transverse momenta, and the exponential decrease in the production frequency of heavy particles with their mass, as shown by Hagedorn. Frautschi's results on "Ericson fluctuations" in hadron physics are outlined briefly. The value of β_o required in all these applications is consistently around [120 MeV]^-1 corresponding to a "resonance volume" whose radius is very close to ƛ_π. The construction of a "multiperipheral cluster model" for high-energy collisions is advocated.

E. U. Magisterio de Vitoria-Gasteiz. Plan general Practicum I. Comisión de prácticas, 21 de marzo de 2011

[ES]La adaptación de la Universidad Española al Espacio Europeo de Educación Superior (EEES) ha supuesto un cambio en los estudios universitarios que se advierte en su estructura (títulos de grado de cuatro años,) y que debe manifestarse también en las metodologías utilizadas. En los estudios de Magisterio la nueva ordenación de las enseñanzas ha supuesto la unificación de las anteriores especialidades en dos títulos de grado: Maestro de Educación Infantil y Maestro de Educación Primaria. En estos nuevos títulos las Prácticas de Enseñanza continúan teniendo un importante papel y constituyen un momento privilegiado de integración entre la teoría y la realidad de las aulas. El Practicum es el conjunto de actividades en las que diversas instituciones colaboran con la Escuela Universitaria de Magisterio, a fin de poner al alumnado en contacto con el mundo profesional. Supone la inmersión de los estudiantes en centros educativos con la finalidad de conocerlos directamente, integrar conocimientos teórico-prácticos, y adquirir competencias profesionales en todos los ámbitos de actuación.

Water temperature studies on the R. North Tyne after impoundment by Kielder dam. 1. General introduction and background data

This report describes the general background to the project, defines the stations from which data sets have been obtained and lists the available data. The project had the following aims: To develop a more accurate and less labour-intensive system for the collection and processing of water temperature data from a number of stations within a stream/river system, and to use the River North Tyne downstream of the Kielder impoundment as a test bed for the system. This should yield useful information on the effects of impoundment upon downstream water temperatures.

E. U. Magisterio de Vitoria-Gasteiz. Plan general Practicum II. Comisión de prácticas, 21 de marzo de 2012

[ES]El Módulo de Practicum se organiza en dos materias: Prácticas escolares (38 créditos ECTS), y Trabajo fin de grado (12 créditos ECTS). Las prácticas escolares se realizarán en los dos ciclos de Educación Infantil (0-3, 3-6) y en los tres de Primaria (1ª-2º, 3º-4º, 5º-6º). Al tratarse de un Practicum progresivo, los estudiantes de los grados de Magisterio cursan la materia a lo largo del segundo, tercer y cuarto curso (Practicum I, Practicum II y Practicum III) con contenidos que tienen continuidad y que suponen un nivel de competencia superior respecto el anterior. El Practicum supone para el alumnado una oportunidad de adquirir e integrar las habilidades, los conocimientos, las competencias y la práctica necesarios para el ejercicio de su profesión, así como una ocasión para reflexionar de forma individual y grupal acerca del aprendizaje realizado. El Practicum I pretende que el alumnado establezca un primer contacto como futuros profesionales con un centro escolar, y realice una observación de carácter global, integrando los conocimientos aprendidos en la Escuela de Magisterio, ajustándolos a la diversidad del aula, a la escuela y al entorno social de ésta, y dedicando una especial atención al tratamiento de género. El Practicum II, al que se refiere esta guía, corresponde al tercer curso y se centra en el desarrollo docente de experiencias de enseñanza y aprendizaje con alumnado de la etapa, la implicación en la vida del ciclo y etapa y el ejercicio de la autocrítica y la reflexión en relación al propio desarrollo formativo y profesional. Se pretende que los estudiantes reflexionen de forma crítica sobre su conocimiento práctico inicial puesto en acción en esos contextos y sobre las condiciones que determinan su forma de pensar y actuar. El Practicum III está relacionado con las menciones (minor) y con la participación en proyectos de innovación.

E. U. Magisterio de Vitoria-Gasteiz. Plan general Practicum III. Comisión de prácticas, 4 de julio de 2014

[ES]Las Prácticas Escolares se realizarán en los dos ciclos de Educación Infantil (0-3, 3-6) y en los tres de Educación Primaria (1º-2º, 3º-4º, 5º-6º). Al tratarse de un Prácticum progresivo, cada estudiante cursa la materia a lo largo del segundo, tercer y cuarto curso (Prácticum I, Prácticum II y Prácticum III) con contenidos que tienen continuidad y que suponen un nivel de competencia superior respecto el anterior. Además, el alumnado que en 4º curso se matricule en el minor de Educación Física deberá realizar su periodo de prácticas junto a una maestra o maestro especialista en esta materia, quien tutorizará sus prácticas. El Prácticum supone para el alumnado una oportunidad de adquirir e integrar las habilidades, los conocimientos, las competencias y la práctica necesarios para el ejercicio de su profesión, así como una ocasión para reflexionar de forma individual y grupal acerca del aprendizaje realizado y de la práctica llevada a cabo.

Intensity-moments characterization of general pulsed paraxial beams with the Wigner distribution function

On the basis of the space-time Wigner distribution function (STWDF), we use the matrix formalism to study the propagation laws for the intensity moments of quasi-monochromatic and polychromatic pulsed paraxial beams. The advantages of this approach are reviewed. Also, a least-squares fitting method for interpreting the physical meaning of the effective curvature matrix is described by means of the STWDF. Then the concept is extended to the higher-order situation, and what me believe is a novel technique for characterizing the beam phase is presented. (C) 1999 Optical Society of America [S0740-3232(99)001009-1].

Aspectos psicossociais do impedimento laboral por motivos de saúde em trabalhadores de cozinhas industriais

Este estudo teve por objetivo investigar a relação trabalho / saúde em trabalhadores de cozinhas industriais, focalizando o aspecto socioeconômico e outras dimensões da vida social (estresse no trabalho e eventos de vida produtores de estresse), incluindo-se morbidade (obesidade, doenças crônicas e transtornos mentais comuns), condição laboral (incômodos ambientais e acidentes de trabalho) e comportamentos relacionados à saúde (consumo alimentar, tabagismo e álcool). Utilizando dados coletados nos nove Restaurantes Populares do Estado do Rio de Janeiro, apresentam-se três artigos. O primeiro descreve a população de estudo, considerando três grupos ocupacionais: Administrativos, Cozinheiros e Copeiros, e os Auxiliares de Serviços Gerais. O segundo artigo investiga a associação entre as características psicossociais e o impedimento laboral por motivos de saúde, considerando uma análise hierarquizada e, finalmente, o terceiro artigo discute a certificação da reprodutibilidade, na população de estudo, do questionário sueco da versão para o português do Demand-Control Questionnaire (DCQ), utilizado para avaliar estresse no ambiente de trabalho. Os homens representaram 62,7% do total de trabalhadores. A idade média dos funcionários foi de 35,1 anos, (DP=10,3). A renda familiar líquida foi de até dois salários mínimos para 60% dos trabalhadores. Obteve-se para o tempo de trabalho em cozinhas, uma média de 59,8 meses, tendo variado de um mínimo de 2 meses e máximo de 30 anos. A prevalência de doenças que tinham diagnóstico médico foi de 15,0% para Doença Osteomusculares Relacionadas ao Trabalho (DORT); 14,3% para Hipertensão Arterial Sistêmica; 12,7% para Gastrite; e, 2,1% para Diabete Mellitus tipo II. O acidente de trabalho corte foi relatado por 20,2% dos trabalhadores, seguido de contusão com 16,0%. A prevalência de acidentes de trabalho foi mais expressiva entre os ASG. A prevalência de impedimento laboral por motivos de saúde foi de 10,8%. Os modelos resultantes das análises multivariadas de associação entre impedimentos das atividades laborais e as variáveis que permaneceram no modelo final após o ajustes das variáveis indicaram que aqueles que referiram estado geral de saúde regular e ruim tiveram uma razão de prevalência de três para impedimento das atividades laborais comparados aos de muito bom e bom estado geral de saúde (RP: 3,59; IC:1,44-8,97). Os trabalhadores que exerciam suas atividades nos restaurante localizados na área 2 (Bangu, Central do Brasil, Maracanã e Niterói) apresentaram RP:2,38; IC:1,15-4,91) para ausências no trabalho quando comparados aos da área 1 (Barra Mansa, Campos, Itaboraí, Duque de Caxias e Nova Iguaçu). A confiabilidade da escala do DCQ, teste-reteste, produziu um Coeficiente de Correlação Intraclasse para as dimensões: demanda psicológica, controle do trabalho e apoio social no trabalho de 0,70, 0,68 e 0,80, respectivamente, sendo considerados bom. Este estudo reforça a importância dos aspectos psicossociais na ocorrência do impedimento por motivos de saúde e contribui para o conhecimento dessas relações. Sugere-se realizar estudos com desenho longitudinal, que permitam aprofundar o conhecimento sobre os determinantes psicossociais do trabalho e o absenteísmo.