Control de cambios / Rastrea los cambios / El camino cambia: Reflexiones sobre un mundo en transformación

“Track changes: Reflecting on a transforming world” was the theme chosen to invite panels, papers, posters and alternative presentations to be part of the 2019 international congress of SIEF that was held in Santiago de Compostela, Galicia (Spain). This introduction includes a description of the content of the congress, the rationale of the choice of plenaries and some reflections about the outcomes of the congress.El lema elegido para presentar paneles, ponencias, posters y presentaciones en formatos alternativos para el congreso internacional 2019 de SIEF -que tuvo lugar en Santiago de Compostela, Galicia (España)- fue “Track changes: Reflecting on a transforming world”. Esta introducción incluye una descripción del contenido del congreso, la idea para la elección de las plenarias y algunas reflexiones sobre los resultados del congreso. &nbsp

An Analysis Of Flow Behavior From A Gas Turbine Combustor Using A Laser Doppler Velcimeter

The purpose of this research was to analyze the flow behavior of air through a combustor and pilot assembly. The combustor was designed to support a combustion flame in gas turbine, and the pilot was the apparatus by which fuel would be supplied to the flame. This research was performed at the University of Central Florida main campus in Orlando, Fl., and was sponsored by Siemens-Westinghouse Power Corporation (SWPC). The combustor and pilot were supplied by SWPC for the purpose of characterizing the flow behavior through them. The focus of the research was to determine the axial and tangential velocity components of the flow. Both components were present due to the fact that the assembly was designed to produce a swirled flow, resulting in a recirculation zone. The main goal of the research conducted was to aid in the combustor design process of SWPC. Measurement of the velocity components was done by using a laser doppler velocimeter (LDV). This research was performed under the supervision of Dr. Ruey-Hung Chen of the Mechanical, Materials, and Aerospace Engineering (MMAE) Department of the University of Central Florida, and will be submitted in partial fulfillment for the Master\u27s Degree in Aerospace Engineering. © 2001 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved

Development of inexpensive continuous emission monitors for feedback control of combustion devices that minimize greenhouse gases, toxic emissions, and ozone damaging products

This is the final report of a three-year, Laboratory Directed Research and Development project at the Los Alamos National Laboratory. Combustion is the major cause of poor urban air quality, of depletion of the ozone layer, and a major source of the greenhouse gas, carbon dioxide. Careful control of combustor conditions is important for minimizing the effects of combustion on the environment. The authors have developed sensitive, inexpensive continuous emission monitors that will assist in direct feedback of turbine power systems and provide assurance to the public and the operators of the facilities that their facility emissions lie within the accepted bounds. These include a robust solid-state Fourier transform spectrometer for rapid gas analysis, based on the use of ferroelectric liquid crystal technology, and an infrared helium-neon probe for real time measurement of combustor air-to-fuel ratios

Differences in life history traits of related Epilobium species : clonality, seed size and seed number

Small changes in morphology can affect the performance and functions of organisms and hence their ecological success. In modular constructed plants, contrasting growth strategies may be realized by differences in the spatial arrangement and size of shoots. Such differences change the way in which meristems and resources are assigned to various functions during the lifespan of a plant. If such changes include the capacity to spread clonally, sexual reproduction may also be affected. I compare patterns in vegetative growth and sexual reproductive traits in four allopatric species of Epilobium which are sometimes considered as subspecies of a single polymorphic taxon. The four species differ in the location of the buds which annually renew the aerial shoot system. E. dodonaei and E. steveni do not spread clonally and are characterized by a shrub-like habit. E. fleischeri, a species occurring only in the Alps, and E. colchicum, which occurs in the upper region of the Caucasus mountains, both produce buds on horizontal roots or plagiotropic shoots. Both alpine species exhibiting clonal growth have smaller shoots, fewer fruits and smaller seeds than the lowland species. An intraspecific trade-off between seed number per fruit and seed mass is realized. Both alpine species produce mon seeds per fruit at the expense of seed mass. The morphological relationship between the four species and their geographical distribution suggest that clonal growth in E. fleischeri (restricted to the Alps) and E. colchicum (restricted to the Caucasus) is adaptively associated with the stressful conditions of alpine habitats. Our results suggest that clonal growth is not necessarily correlated with reduced reproduction by seeds. The success of plants which are already established may largely depend on clonal spread, but the colonization of new habitats depends on the production of a large number of small seeds with high dispersability