Developing Design Methods - A Conceptual Requirement Framework

Design methods can provide valuable support in structuring and solving complex product design problems. However, the application and the transfer of methods from academia to industry is limited. To date, research has tended to focus on solving this through improved method selection, method adaptation and training. The development of design methods itself has attracted surprisingly low attention. This paper closes this gap and adds a quite new perspective of systematic requirement management of method development. However, the variety of methods, method users and application contexts is a key challenge and does not allow for a universal set of requirements. Thus, this paper transfers the concept of solution-neutral requirements frameworks, which are established in product design, to method development. The framework is derived from analysing and structuring different requirements found in literature. Different requirement sub-/categories allow for accommodating the varying levels of detail of requirements. The framework works like a checklist and helps design researchers to consider the most important requirement categories, which subsequently can be detailed project-specifically

Comprehensive transient-state study for CARMENES-NIR high thermal stability

CARMENES has been proposed as a next-generation instrument for the 3.5m Calar Alto Telescope. Its objective is finding habitable exoplanets around M dwarfs through radial velocity measurements (m/s level) in the near-infrared. Consequently, the NIR spectrograph is highly constraint regarding thermal/mechanical requirements. As a first approach, the thermal stability has been limited to \pm 0.01K (within year period) over a working temperature of 243K. This can be achieved by means of several temperature-controlled rooms. The options considered to minimise the complexity of the thermal design are here presented, as well as the transient-state thermal analyses realised to make the best choice

Thermographic imaging: assessment of drought and heat tolerance in Spanish germplasm of Brachypodium distachyon.

The annual grass Brachypodium distachyon has been recently recognized as the model plant for functional genomics of temperate grasses, including cereals of economic relevance like wheat and barley. Sixty-two lines of B. distachyon were assessed for response to drought stress and heat tolerance. All these lines, except the reference genotype BD21, derive from specimens collected in 32 distinct locations of the Iberian Peninsula, covering a wide range of geo- climatic conditions. Sixteen lines of Brachypodium hybridum, an allotetraploid closely related to B. distachyon were used as reference of abiotic-stress well-adapted genotypes. Drought tolerance was assessed in a green-house trial. At the rosette-stage, no irrigation was applied to treated plants whereas their replicates at the control were maintained well watered during all the experiment. Thermographic images of treated and control plants were taken after 2 and 3 weeks of drought treatment, when stressed plants showed medium and extreme wilting symptoms. The mean leaf temperature of stressed (LTs) and control (LTc) plants was estimated based upon thermographic records from selected pixels (183 per image) that strictly correspond to leaf tissue. The response to drought was based on the analysis of two parameters: LTs and the thermal difference (TD) between stressed and control plants (LTs – LTc). The response to heat stress was based on LTc. Comparison of the mean values of these parameters showed that: 1) Genotypes better adapted to drought (B. hybridum lines) presented a higher LTs and TD than B. distachyon lines. 2) Under high temperature conditions, watered plants of B. hybridum lines maintained lower LTc than those of B. distachyon. Those results suggest that in these species adaptation to drought is linked to a more efficient stomata regulation: under water stress stomata are closed, increasing foliar temperature but also water use efficiency by reducing transpiration. With high temperature and water availability the results are less definite, but still seems that opening stomata allow plants to increase transpiration and therefore to diminish foliar temperature

La dinámica de un territorio en Yucatán. Informe final

En el informe presentamos los principales resultados de la investigación multidisciplinaria en un territorio formado por cuatro municipios del estado mexicano de Yucatán para responder las dos preguntas básicas del Programa Dinámicas Territoriales Rurales (PDTR): ¿cuáles han sido los fenómenos endógenos y exógenos que han influenciado la dinámica del territorio en los últimos 20 años? y ¿cuáles son los fenómenos que podrían explicar el resultado de una mejora durante el periodo en el nivel de bienestar de sus hogares según los resultados de la primera etapa del proyecto? Es común que en los procesos de desarrollo haya población excluida de sus beneficios. Con el fin de estudiar este aspecto en el territorio yucateco añadimos respuesta a la pregunta: ¿cuáles son los niveles de pobreza y desigualdad prevalecientes en el territorio?Yucatán, México, economías rurales, América Latina, dinámicas territoriales

Beta-decay of nuclei around Se-90. Search for signatures of a N=56 sub-shell closure relevant the r-process

Nuclear structure plays a significant role on the rapid neutron capture process (r-process) since shapes evolve with the emergence of shells and sub-shells. There was some indication in neighboring nuclei that we might find examples of a new N=56 sub-shell, which may give rise to a doubly magic Se-90 nucleus. Beta-decay half lives of nuclei around Se-90 have been measured to determine if this nucleus has in fact a doubly-magic character. The fragmentation of Xe-136 beam at the National Superconducting Cyclotron Laboratory at Michigan State University was used to create a cocktail of nuclei in the A=90 region. We have measured the half lives of twenty-two nuclei near the r-process path in the A=90 region. The half lives of As-88 and Se-90 have been measured for the first time. The values were compared with theoretical predictions in the search for nuclear-deformation signatures of a N=56 sub-shell, and its possible role in the emergence of a potential doubly-magic Se-90. The impact of such hypothesis on the synthesis of heavy nuclei, particularly in the production of Sr, Y and Zr elements was investigated with a weak r-process network. The new half lives agree with results obtained from a standard global QRPA model used in r-process calculations, indicating that Se-90 has a quadrupole shape incompatible with a closed N=56 sub-shell in this region. The impact of the measured Se-90 half-life in comparison with a former theoretical predication associated with a spherical half-life on the weak-r-process is shown to be strong

La dinámica de un territorio en Yucatán

El hilo conductor del proyecto en Yucatán partió de las preguntas surgidas del Programa Dinámicas Territoriales Rurales (DTR): ¿Cuáles han sido los fenómenos endógenos y exógenos que han influenciado la dinámica del territorio a estudiar en los últimos 20 años?; ¿Cuáles son los fenómenos que podrían explicar el resultado de una mejora de 1990 a 2005 en el nivel de bienestar de los hogares de cuatro municipios en el estado de Yucatán? A las estas dos preguntas hemos añadido la que sigue:¿ha cambiado el bienestar de los hogares de estos municipios en 2009? Un paso previo, necesario para llevar a cabo el estudio, fue indagar si los cuatro municipios yucatecos pueden considerarse como un territorio. Con base en los resultados obtenidos consideramos que los municipios de Cuzamá, Huhí, Acanceh y Homún forman un territorio, que denominamos CHAH a partir de la primera letra de sus nombres. Nuestra investigación se ha basado en el uso de dos metodologías: cualitativa y cuantitativa.Yucatán, México, economías rurales, Latín América, dinámicas territoriales