43 research outputs found
Hydrographic Observations and Recovery of the Moorings
No full textMETEOR expedition M34 was carried out as part of the long-range investigations being pursued under the Special Research Project (SFB) No. 261, for the reconstruction of mass budget and current systems in the South Atlantic during the Late Quaternary. On METEOR cruise M34 samples and data were recovered from the upwelling region off Namibia, the central South Atlantic, and off North Brazil and Barbados. The cruise consisted of four legs, starting in Cape Town on January 3, 1996, and ending at Barbados on April 15, 1996. During the first leg, seismic and echographic measurements along a series of profiles as well as the sampling of surface sediments in the Cape Basin area was performed. These investigations provide basic information for a deep coring operation by the international Ocean Drilling Program, which is being prepared for by the University of Bremen. The main objective of the second leg was to investigate the biogeochemical processes in sediments of the upwelling area off Namibia. The scientific groups of the Max-Planck-Institut for Marine Microbiology and the Department of Geoscience of the University of Bremen worked closely together to produce new data for the biogeochemical reaction rates. On the third leg sediment cores were receovered to supplement the sample materials of SFB 261 in the central South Atlantic. Core-station profiles were taken from the Angola Basin to the Mid-Ocean-Ridge, and from there into the Brazil Basin. This cruise served also as a continuation of the investigations of the Institut für Meereskunde Kiel and the Traceroceanography of the University of Bremen, which are studying the spread of bottom water on the southern edge of the Brazil Basin, and determining temporal changes in the chlorofluoromethane content of the water, respectively. Three signal generator moorings were also recovered. The main objective of the fourth leg was to determine the seasonal particle sedimentaton in the western equatorial Atlantic and to extend the investigations of sediments from the Amazon Fan and Ceara Rise
Implementación de un CNC con 3 grados de libertad aplicado a impresión 3D
No full text"La robótica es un campo relativamente nuevo en la tecnología moderna. Dentro de los tipos de robots están los robots manipuladores, que se encuentran mayormente en lo que es el área industrial ya que ofrecen ventajas considerables por el hecho de que pueden realizar tareas difíciles o peligrosas para el ser humano, así como también pueden realizar dichas tareas en menor tiempo y con mayor calidad. Dentro de los robots manipuladores se encuentra el robot cartesiano, el cual es uno de los dispositivos de mayor uso en las máquinas automatizadas gracias a que puede generar trayectorias complejas en un espacio tridimensional a partir de movimientos lineales independientes. De esta forma, pueden ser empleados para manipular objetos o en máquinas-herramienta de control numérico computarizado (CNC) como las cortadoras láser, perforadoras de placas, soldadura y centros de mecanizado, para realizar trabajos de pinck & place (recoger y colocar), ensamblaje, corte, carga o incluso como impresora 3D, entre otras.
THE FUTURE OF OPEN ACCESS BOOKS: FINDINGS FROM A GLOBAL SURVEY OF ACADEMIC BOOK AUTHORS
No full textThis report presents the findings from an online survey conducted in February and March 2019 to gather author feedback on open access (OA) books. Survey questions were designed to build on previous studies of OA for journal authors, as well as previous research on OA books, to assess the current awareness, attitudes and behaviours of authors who have and have not previously published OA. The raw anonymised data has been made freely available under a CC BY licence.2 Of 5,509 responses, 2,542 book authors completed the survey, and only these responses have been analysed here. Of these, 407 authors had previously published at least one OA book, 2,037 authors had not published an OA book, and 98 authors did not know whether they had published an OA book previously.3 Additionally, from the total number of book authors, 917 had published one or more chapters OA in an otherwise non-OA book
