New calculations of P(b) curves for 1s_\sigma excitation in low-Z (Z\le10) ion-atom scattering

Ab initio fully relativistic SCF molecular calculations of energy eigenvalues as well as coupling-matrix elements are used to calculate the 1s_\sigma excitation differential cross section for Ne-Ne and Ne-O in ion-atom collisions. A relativistic perturbation treatment which allows a direct comparison with analogous non-relativistic calculations is also performed.

A survey addressing the fundamental matrix estimation problem

Epipolar geometry is a key point in computer vision and the fundamental matrix estimation is the only way to compute it. This article surveys several methods of fundamental matrix estimation which have been classified into linear methods, iterative methods and robust methods. All of these methods have been programmed and their accuracy analysed using real images. A summary, accompanied with experimental results, is given

Rank estimation of trajectory matrix in motion segmentation

A novel technique for estimating the rank of the trajectory matrix in the local subspace affinity (LSA) motion segmentation framework is presented. This new rank estimation is based on the relationship between the estimated rank of the trajectory matrix and the affinity matrix built with LSA. The result is an enhanced model selection technique for trajectory matrix rank estimation by which it is possible to automate LSA, without requiring any a priori knowledge, and to improve the final segmentation

Plan estratégico exportador para la empresa: productora y comercializadora Reina (P&C Reina)

El presente trabajo de grado tiene como tema central la internacionalización de los productos fabricados por la empresa P&C REINA, fertilizantes Químicos – orgánicos. Actualmente, P&C REINA es la única compañía en producir este tipo de fertilizantes en Colombia y a su vez, fue la primera empresa en dar a conocer al mercado nacional una nueva alternativa de fertilizantes, los cuales cuentan con un alto valor agregado y un avanzado nivel tecnológico, que ayudan a recuperar y a mejorar los suelos maltratados o deteriorador por el mal uso de estos productos en las tierras. Gracias a la experiencia que lleva esta compañía en el mercado y al reconocimiento que han obtenido por sus productos, por parte de las diferentes asociaciones y cámaras agrícolas existentes en el país, P&C REINA ha demostrado que en Colombia se puede hacer agricultura sana; esto ha contribuido de manera positiva a la empresa por medio de una participación significativa en el mercado y un posicionamiento de sus productos en el nicho en donde se desempeña. P&C REINA en el último año estudió la posibilidad de incursionar en el mercado internacional, con el fin de obtener un mayor reconocimiento, incrementar sus utilidades netas, aumentar su participación en el mercado nacional como internacional, mejorar sus procesos productivos, entre otras razones. Es por esto que con este trabajo lo que se busca es analizar si la empresa tiene la capacidad logística, competitiva y productiva para poder responder a las exigencias de los consumidores que se encuentran en diferentes países; luego se llevará a cabo una investigación de mercado con 16 países, las cuales la empresa considero atractivos para sus productos, con el fin de tener claro cuál es el país objetivo o potencial en donde la empresa tiene una mayor oportunidad de participación, posteriormente, se hará un análisis de dicho país y se propondrá las diferentes estrategias de internacionalización que puede implementar la compañía para poder entrar satisfactoriamente en ese mercado. Finalmente, se armará la matriz de costos con el fin de saber cuáles son los gastos generados en el proceso de logística internacional y así, decidir cuál termino de negociación (INCOTERMS) la empresa debe utilizar a la hora de llevar a cabo un pacto comercial con algún cliente.

Estructura organizacional del área de responsabilidad social de Pacific E&P

Este artículo tiene como objetivo describir la estructura del área de Responsabilidad Social de Pacific E&P, mediante un proceso que explique el funcionamiento y desarrollo de la estructura de RSE. Este trabajo se desarrolla bajo una matriz estratégica la cual incluye variables como: evolución del área (historia), plataforma estratégica (plan de acción que desarrolla una ventaja competitiva de la empresa), división del trabajo (Fragmentación de trabajo y especialización entre sus fuerzas laborales) y por último la coordinación del trabajo (sincronización de fuerzas laborales). Los resultados que se obtienen de este estudio mostrarán las distintas unidades de trabajo de la organización y la forma de trabajar de la misma, bajo el marco de la Responsabilidad Social Corporativa.

Matrix.

Registro con código de documento duplicado y modificado posteriormente

Matrix : filosofía y cine.

Incluye anexos y un apéndice didáctico

Modalidades de aprendizaje telemático y resultados interuniversitarios extrapolables al nuevo EEES : (Proyecto MATRIX).

Se presenta un estudio sobre los criterios metodológicos, estrategias y actividades que deben adoptarse en las modalidades formativas semipresenciales, para determinar las claves que garantizan la eficacia de la docencia apoyada en entornos virtuales. Se aportan orientaciones básicas que facilitan al profesorado universitario, en el marco del nuevo Espacio Europeo de Educación Superior, la creación de los complementos virtuales en sus asignaturas presenciales y la formulación de e-actividades para el desarrollo de competencias genéricas. El contenido se estructura en dos partes: en la primera se describe el proyecto MATRIX, el entorno virtual creado para él y las asignaturas implicadas en el proyecto. En una segunda parte se analizan los resultados obtenidos, los datos cuantitativos y cualitativos y los indicadores de calidad derivados de los resultados obtenidos.

Proyecto MATRIX : modalidades de aprendizaje telemático y resultados interuniversitarios extrapolables al Blended Learning.

Monográfico con el título: 'Web 2.0 : dispositivos móviles y abiertos para el aprendizaje'. Resumen basado en el de la publicación

Impact of Resolution on the Tropical Pacific Circulation in a Matrix of Coupled Models

Results are presented from a matrix of coupled model integrations, using atmosphere resolutions of 135 and 90 km, and ocean resolutions of 1° and 1/3°, to study the impact of resolution on simulated climate. The mean state of the tropical Pacific is found to be improved in the models with a higher ocean resolution. Such an improved mean state arises from the development of tropical instability waves, which are poorly resolved at low resolution; these waves reduce the equatorial cold tongue bias. The improved ocean state also allows for a better simulation of the atmospheric Walker circulation. Several sensitivity studies have been performed to further understand the processes involved in the different component models. Significantly decreasing the horizontal momentum dissipation in the coupled model with the lower-resolution ocean has benefits for the mean tropical Pacific climate, but decreases model stability. Increasing the momentum dissipation in the coupled model with the higher-resolution ocean degrades the simulation toward that of the lower-resolution ocean. These results suggest that enhanced ocean model resolution can have important benefits for the climatology of both the atmosphere and ocean components of the coupled model, and that some of these benefits may be achievable at lower ocean resolution, if the model formulation allows.

Towards a nutrient export risk matrix approach to managing agricultural pollution at source

A generic Nutrient Export Risk Matrix (NERM) approach is presented. This provides advice to farmers and policy makers on good practice for reducing nutrient loss and is intended to persuade them to implement such measures. Combined with a range of nutrient transport modelling tools and field experiments, NERMs can play an important role in reducing nutrient export from agricultural land. The Phosphorus Export Risk Matrix (PERM) is presented as an example NERM. The PERM integrates hydrological understanding of runoff with a number of agronomic and policy factors into a clear problem-solving framework. This allows farmers and policy makers to visualise strategies for reducing phosphorus loss through proactive land management. The risk Of Pollution is assessed by a series of informed questions relating to farming intensity and practice. This information is combined with the concept of runoff management to point towards simple, practical remedial strategies which do not compromise farmers' ability to obtain sound economic returns from their crop and livestock.

The gas-phase reactions Of SiCl4 and Si2Cl6 with CH3OH and C2H5OH: an investigation by mass spectrometry and matrix-isolation infrared spectroscopy

The gas phase reactions Of SiCl4 and Si2Cl6 With CH3OH and C2H5OH have been investigated using both mass spectrometry and matrix isolation techniques. SiCl4 reacts with both CH3OH and C2H5OH upon mixing of the vapours for times in excess of 3 h to generate the HCl-elimination products SiCl3OR (R = CH3 or C2H5). The identity of these products is confirmed by deuteration experiments and by ab initio calculations at the HF/6-31G(d) level. Further products are generated when the mixture is passed through a tube heated to 750degreesC. Si2Cl6 reacts with CH3OH and C2H5OH via a different mechanism in which the Si-Si bond is cleaved to yield SiCl3OR and HCl. Other products of the type SiCl4-n(OCH3)(n) are tentatively identified by a combination of mass spectrometric and matrix isolation measurements. These latter products indicate further replacement of Cl atoms by OR groups as a result of reaction of CH3OH or C2H5OH with the initial product.

Predicting the thermal inactivation of bacteria in a solid matrix: simulation studies on the relative effects of microbial thermal resistance parameters and process conditions

A combined mathematical model for predicting heat penetration and microbial inactivation in a solid body heated by conduction was tested experimentally by inoculating agar cylinders with Salmonella typhimurium or Enterococcus faecium and heating in a water bath. Regions of growth where bacteria had survived after heating were measured by image analysis and compared with model predictions. Visualisation of the regions of growth was improved by incorporating chromogenic metabolic indicators into the agar. Preliminary tests established that the model performed satisfactorily with both test organisms and with cylinders of different diameter. The model was then used in simulation studies in which the parameters D, z, inoculum size, cylinder diameter and heating temperature were systematically varied. These simulations showed that the biological variables D, z and inoculum size had a relatively small effect on the time needed to eliminate bacteria at the cylinder axis in comparison with the physical variables heating temperature and cylinder diameter, which had a much greater relative effect. (c) 2005 Elsevier B.V All rights reserved.

The absorption of vitamin E is influenced by the amount of fat in a meal and the food matrix

Vitamin E absorption requires the presence of fat; however, limited information exists on the influence of fat quantity on optimal absorption. In the present study we compared the absorption of stable-isotope-labelled vitamin E following meals of varying fat content and source. In a randomised four-way cross-over study, eight healthy individuals consumed a capsule containing 150 mg H-2-labelled RRR-alpha-tocopheryl acetate with a test meal of toast with butter (17.5 g fat), cereal with full-fat milk (17.5 g fat), cereal with semi-skimmed milk (2.7 g fat) and water (0g fat). Blood was taken at 0, 0.5, 1, 1.5, 2, 3, 6 and 9 h following ingestion, chylomicrons were isolated, and H-2-labelled alpha-tocopherol was analysed in the chylomicron and plasma samples. There was a significant time (P<0.001) and treatment effect (P<0.001) in H-2-labelled alpha-tocopherol concentration in both chylomicrons and plasma between the test meals. H-2-labelled alpha-tocopherol concentration was significantly greater with the higher-fat toast and butter meal compared with the low-fat cereal meal or water (P< 0.001), and a trend towards greater concentration compared with the high-fat cereal meal (P= 0.065). There was significantly greater H-2-labelled α-tocopherol concentration with the high-fat cereal meal compared with the low-fat cereal meal (P< 0.05). The H-2-labelled alpha-tocopherol concentration following either the low-fat cereal meal or water was low. These results demonstrate that both the amount of fat and the food matrix influence vitamin E absorption. These factors should be considered by consumers and for future vitamin E intervention studies.