Long-term dynamics of fast rotating tethers around planetary satellites

We derive a semi-analytic formulation that enables the study of the long-term dynamics of fast-rotating inert tethers around planetary satellites. These equations take into account the coupling between the translational and rotational motion, which has a non-negligible impact on the dynamics, as the orbital motion of the tether center of mass strongly depends on the tether plane of rotation and its spin rate, and vice-versa. We use these governing equations to explore the effects of this coupling on the dynamics, the lifetime of frozen orbits and the precession of the plane of rotation of the tether.

The elliptic rendezvous problem in DROMO formulation

The extension of DROMO formulation to relative motion is evaluated. The orbit of the follower spacecraft can be constructed through differences on the elements defining the orbit of the leader spacecraft. Assuming that the differences are small, the problemis linearized. Typical linearized solutions to relativemotion determine the relative state of the follower spacecraft at a certain time step. Because of the form of DROMO formulation, the performance of a frozen-anomaly transformation is explored. In this case, the relative state is computed for a certain value of the anomaly, equal for leader and follower. Since the time for leader and follower do not coincide, the implicit time delay needs to be corrected to recover the physical sense of the solution. When determining the relative orbit, numerical testing shows significant error reductions compared to previous linearized solutions.

Asymptotic Solution for the Two Body Problem with Radial Perturbing Acceleration

In this article, an approximate analytical solution for the two body problem perturbed by a radial, low acceleration is obtained, using a regularized formulation of the orbital motion and the method of multiple scales. The results reveal that the physics of the problem evolve in two fundamental scales of the true anomaly. The first one drives the oscillations of the orbital parameters along each orbit. The second one is responsible of the long-term variations in the amplitude and mean values of these oscillations. A good agreement is found with high precision numerical solutions.

Guía para la implementación de BPM en la producción de carne de cerdo y derivados tendientes a eliminar el riesgo de presencia de Trichinella Spiralis.

En el marco de nuestra investigación: “Evaluación cuantitativa de riesgo para la salud pública por trichinelosis debido al consumo de productos elaborados con carne porcina en la provincia de Santa Fe y Córdoba”, financiada por la Universidad Católica de Córdoba, que se encuentra en su último año de ejecución; hemos observando que los establecimientos productores no cuentan con un correcto sistema de Buenas prácticas de manufacturas, diseñado e implementado para prevenir la presencia del parásito Trichinella spiralis. Por ello, surgió la inquietud de realizar un guía con los contenidos apropiados obligatorios por la Legislación Vigente (Ley 18.284, Código Alimentario Argentino, y el Decreto 4238/68, Ley Federal de Carnes), sumado a la experiencia propia de los integrantes en cuanto a la temática y a la idea de transmitir dicha experiencia en forma de contenidos sencillos, didácticos y gráficos, de fácil aplicación, prácticos y accesibles a todos los sectores de la cadena de producción y comercialización (tanto a grandes como a pequeños productores, incluidos los productores familiares) y a la comunidad en general. La enfermedad es endémica en la provincia de Córdoba y el último año se han presentado numerosos casos que alertan sobre su presentación, ya que la misma tiene impacto en salud pública y en la economía de la provincia ya que se trata de un producto con fuerte desarrollo en regiones bien definidas y sensible al turismo.

Layer description, carbon and nitrogen content and stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike

An investigation of stable isotope (d13C TOC and d15N TN) and elemental parameters (TOC, TN contents and TOC/TN ratios) of bulk organic matter (<200 µm) from sediment cores recovered from the Patagonian lake Laguna Potrok Aike (Argentina) in the framework of the ICDP deep drilling project PASADO provided insights into past changes in lake primary productivity and environmental conditions in South Patagonia throughout the last Glacial-Interglacial transition. Stratigraphically constrained cluster analyses of all proxy parameters suggest four main phases. From ca 26,100 to 17,300 cal. years BP, lacustrine phytoplankton was presumably the predominant organic matter source in an aquatic environment with low primary productivity rates. At around 17,300 cal. years BP, abrupt and distinct shifts of isotopic and elemental values indicate that the lacustrine system underwent a rapid reorganization. Lake primary productivity (phytoplankton and aquatic macrophytes) shows higher levels albeit with large variations during most of the deglaciation until 13,000 cal. years BP. The main causes for this development can be seen in improved growing conditions for primary producers because of deglacial warming in combination with expedient availability of nutrients and likely calm wind conditions. After 13,000 cal. years BP, decreased d13C TOC values, TOC, TN contents and TOC/TN ratios indicate that the lake approached a new state with reduced primary productivity probably induced by unfavourable growing conditions for primary producers like strengthened winds and reduced nutrient availability. The steady increase in d15N TN values presumably suggests limitation of nitrate supply for growth of primary producers resulting from a nutrient shortage after the preceding phase with high productivity. Nitrate limitation and consequent decreased lacustrine primary productivity continued into the early Holocene (10,970-8400 cal. years BP) as reflected by isotopic and elemental values.

Páginas olvidadas : colección de artículos publicados en diversos diarios y en diferentes épocas /

Mode of access: Internet.

Informe sobre la propiedad de las riberas é islas del Río Paraná, presentado al Exmo. Gobierno de la Nación /

Mode of access: Internet.

A history of education in New Mexico. Pertinent advice to students. Education and its relations to the discovery, conquest, civilization and colonization of New Mexico; the minister of God and the teacher,

Mode of access: Internet.

Ondas de luz /

"Contiene más de sesenta poesías del autor y entre ellas catorce laureadas en los principales juegos florales y concursos literarios del país."

The preacher of Cedar mountain

Mode of access: Internet.

Of a temporary character : an historic structure report of first fort, second fort, and the arsenal and historical base map, Fort Union National Monument, Fort Union, New Mexico /

Includes bibliographical references (p. [93]-101).

Archeological investigations along the proposed Alibates tour road improvement construction route, Alibates Flint Quarries National Monument, Potter County, Texas /

"Contract no. PX 7029-8-0986."

New Mexico statewide wilderness study.

"BLM-NM-ES-85-002-4332"--P. [2] of cover.

Reports of cases determined in the Supreme Court of the Territory of New Mexico.

Reporters: v. 1-10, C. H. Gildersleeve; v. 11-13, A. J. Abbott; v. 14-16, P. A. F. Walter.

Traffic safety in construction zones. Final report.

New Mexico State Highway and Transportation Department, Santa Fe