1,437 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
La industria lítica de Gran Coclé, Panamá, a finales del periodo Cerámico medio. Resultado del análisis de material lítico de la Operación 8 de Sitio Cerro Juan Díaz
No full textBird, J. y R.G. Cooke
1978. “La Cueva de los Ladrones, datos
preliminares sobre la ocupacion formativa”, Actas
del V Simposium Nacional de Antropología Arqueología
y Etnohistoria de Panamá, Panamá, Universidad
de Panamá/Instituto Nacional de Cultura,
pp. 283-305.Bush, M.B. y P.A. Colinvaux
1990. “A pollen record of a complete glacial cycle
from lowland Panama”, Journal of Vegetation Science
1, pp. 105-18.Bush, M. B., D.R. Piperno, P.A. Colinvaux, P.A. P.E. de
Oliveira, L.A. Krissek, M.C. Miller y W.E. Rowe
1992. “A 14,300-yr. paleoecological profile of a
lowland tropical lake in Panama”, Ecological
Monographs, 62, pp. 251-275.Carbonell, E., M. Gilbaud y R. Mora
1982. “Aplicación de la methode dialectique à la
construction d’un systeme analytique pour
l’étude des matériaux du Paléolitique Inférieur”,
Dialektike, 7, pp. 23.Clary, James, P. Hansell, A.J. Ranere, T. Buggey
1984. “The Holocene geology of the western Parita
Bay coastline of central Panama”, en F.W. Lange
(ed.), Recent Developments in Isthmian Archaeology.
British Archaeological Reports, International Series
212, Oxford: B.A.R., pp. 55-83.Cooke, R.G.
1992. “Prehistoric Nearshore and Littoral Fishing
in the Eastern Tropical Pacific: An Ichthyological
Evaluation”, Journal of World Prehistory, 6, p. 1.1998. “Subsistencia y economía casera de los
indígenas precolombinos de Panamá”, en A. Pastor
(coord.), Antropología Panameña: Pueblos y Culturas,
Panamá, Universitaria, pp. 61-134.1999. “The Native People of Central America
during Precolumbian and Colonial Times”, en
Anthony Coates (coord.), Central America, a natural
and cultural history, New Haven y London, Yale
University Press, pp. 137-176.En prensa. “Prehistory of Native Americans on the
Central American Land Bridge: colonization,
dispersal and divergence”.Cooke, G. R. y A. Ranere
1984. “The ‘Proyecto Santa Maria’: a
multidisciplinary analysis of prehistoric
adaptations to a Tropical watershed in Panama”,
en F. Lange (coord.), Recent Developments in Isthmian
Archaeology, Oxford, British Archaeological Reports
International (Series 212), pp. 3-30.1992. “The origin of wealth and hierarchy in the
Central Region of Panama (12,000-2,000BP), with
observations on its relevance to the history and
phylogeny of Chibchan-speaking polities in
Panama and elsewhere”, en F. Lange (coord.),
Wealth and Hierarchy in the Intermediate Area,
Washington, DC, Dumbarton Oaks,
pp. 243-316.1994. “Relación entre recursos pesqueros, geografía
y estrategia de subsistencia en dos sitios
arqueológicos de diferentes edades en un estuario
del pacífico central de Panamá”, Memoria del
Primer Congreso Nacional del Patrimonio
Cultural, Panamá.Cooke, R.G., M. Jiménez, A. Ranere
2002. “Influencias humanas sobre la vegetación y
fauna de vertebrados de Panamá: actualización de
datos arqueozoológicos y su relación con el paisaje
antrópico”, en E. Leigh (coord.), Ecología y
Conservación en Panamá, Panamá, Smithsonian
Tropical Research Institute.Dillehay, T.D.
1989. Monte Verde: A Late Pleistocene Settlement in
Chile, vol. 1, Washington, D.C., Smithsonian
Institution Press.1997. Monte Verde: A Late Pleistocene Settlement in
Chile, vol. 2, Washington, D.C., Smithsonian
Institution Press.Hansell, Patricia
1988. “The Rise and Fall of an Early Formative
Community: La Mula-Sarigua, central Pacific
Panama”, tesis doctoral, Filadelfia, Universidad
de Temple Press.Iltis, H.H.
2000. “Homeotic sexual translocations and the
origin of maize (Zea mays, Poaceae): a new
look at an old problem”, Economic Botany, 54,
pp. 7-42.Jiménez, Máximo
1999. “Explotación de vertebrados acuáticos y
terrestres por los indígenas precolombinos en
Cerro Juan Díaz, Los Santos, durante el Periodo
300-700 d.C.”, tesis de graduación, Escuela de
Biología, Universidad de Panamá, Panamá.Jiménez, M. y R.G. Cooke
2001. “Pesca Precolombina en el Borde de un
Estuario Neotropical: Cerro Juan Díaz (Bahía de
Parita, Costa del Pacífico de Panamá)”, Actas del
39 Congreso de Americanistas, Quito, 1997.Laplace, G.
1974. “De la dynamique de l’Analyse structurale ou
la typologie analythique”, Di Science Prehistoriche,
XXIX, pp. 1-71.Leroi-Gourhan
1988. El hombre y la materia, Madrid, Taurus,
Comunicación.Linné, S.
1929. Darién in the past. The archaeology of eastern
Panama and north-westrn Colombia, Goterborgs
Kungl. Vetensakps och Vitterhets-Samhalles
Handillingar, Femte Foldjen. Goteborg, Elanders
Boktryckeri Aktiebolag (Ser. A. Band 3).Mayo Torné, J.
2004. “La Industria Prehispánica de Conchas
Marinas en Gran Coclé, Panamá”, tesis doctoral,
Departamento de Historia de América II
(Antropología americana), Universidad
Complutense de Madrid.McGimsey III, Ch. R.
1956. “Cerro Mangote. A preceramic site in
Panamá”, American Antiquity, vol. 22, pp. 151-161.McGimsey III, Ch. R., M.B. Collins y T.W. Mckern
1986-1987. “Cerro Mangote and its population”,
Journal of the Steward Anthropological Society, 16 (1 y
2), pp. 125-157.Merino, J. M.
1994. Tipología Lítica, Antropologia-Arkeologia.
Sociedad de Ciencias Aranzadi Zientzi Elkartea,
Suplemento 9, Munibe.Pearson, G.A.
2002. “Pan-Continental Paleoindian Expansions
and Interactions As Viewed from The Earliest
Lithic Industries of Lower Central America”, tesis
doctoral, Departamento de Antropología,
University of Kansas, mecanografiado.Pearson, G.A. y R.G. Cooke
2002. “The Role of the Panamanian Land Bridge
During the Initial Colonization of the Americas”,
Antiquity, 76, pp. 931-932.Piperno, D.R.
1989. “Non-affluent foragers: resource avaliability,
seasonal shortages and the emergence of
agriculture in Panamanian tropical forests”, en
D.R. Harris y G. Hillmanm (coords.), Foraging and
Farming: the Evolution of Plant Domestication,
Londres, Unwin Hymanç, pp. 538-554.1998. “Paleoethnobotany in the Neotropics from
microfossils: new insights into ancient plant use
and agricultural origins in the tropical forest”,
Journal of World Prehistory, 12, pp. 393-449.Piperno, D.R. y D.M. Pearsall
1998. The Origins of Agriculture in the Lowland Tropics,
San Diego, Academic Press.Piperno D.R., M.B. Bush y P.A. Colinvaux
1991. “Paleoecological perspectives on human
adaptation in Panama”, The Pleistocene
Geoarchaeology, 6, pp. 201-26.Piperno, D.R., A.J. Ranere, I. Holst y P. Hansell
2000. “Starch grains reveal early root crop
horticulture in the Panamanian tropical forest”,
Nature, 407, pp. 894-897.Piperno, D.R. y J.G. Jones
2003. “Paleoecological and archaeological
implications of a Late Pleistocene/early Holocene
record of vegetation and colimate chage from the
pacific coastal plain of Panama”, Quaternary
Research, 59, pp. 79-86.Ranere, A.
1973. “Una reinterpretación del precerámico
panameño”, Actas del III Simposium de
Antropología, Arqueología y etnohistoria de
Panamá, Panamá.Ranere, A. y R.G. Cooke
1995. “Evidencias de ocupación humana en
Panamá a postrimerías del Pleistoceno y a
comienzos del Holoceno”, en Cavelier y S. Mora
(eds.), Ámbito y Ocupaciones Tempranas de la América
Tropical, Bogotá, Fundación Erigaie/Instituto
Colombiano de Antropología, pp. 5-26.1996. “Stone Tools and Cultural Boundaries in
Prehistoric Panama”, en F. Lange (ed.), Paths to
Central American Prehistory, Niwot CO, University
Press of Colorado, pp. 49-77.2002. “Late glacial and early Holocene occupation
of Central American tropical forests”, en Julio
Mercader (ed.), Under the Canopy, New Brunswick,
Rutgers University Press, pp. 219-248.Sheets, Payson D., E.J. Rosenthal y A.J. Ranere
1980. “Stone tools from Volcan Barú”, en Linares y
Ranere (eds.), Adaptive Radiations in Prehistoric
Panama, Peabody Museum Monographs 5,
Cambridge, Harvard University Press,
pp. 404-428.Valerio Lobo, W.V.
1987. “Análisis estratigráfico y funcional de
Carabalí (SF-9). Un abrigo rocoso en la Regió
Long-term fire and vegetation change in northwestern Amazonia
No full textAmazonian forest plots are used to quantify biodiversity and carbon sequestration, and provide the foundation for much of what is known about tropical ecology. Many plots are assumed to be undisturbed, but recent work suggests that past fire, forest openings, and cultivation created vegetation changes that have persisted for decades to centuries (ecological legacies). The Yasuní Forest Dynamics plot is one of the most biodiverse places on earth, yet its human history remains unknown. Here, we use charcoal and phytolith analysis to investigate the fire and vegetation history of the Yasuní forest plot, and compare results with nearby forest plots in Colombia (Amacayacu) and Peru (Medio Putumayo-Algodón (MPA)) to explore the spatial variability of past disturbances and ecological legacies in northwestern Amazonia. Three 14C dated charcoal fragments provided evidence for a modern (1956 CE) and a past fire event ca. 750 years ago at Yasuní, compared with fire ages of 1000-1600 years ago documented at Amacayacu and MPA. Small-scale disturbances and localized canopy-openings also occurred in the Yasuní plot. Phytolith assemblages from Yasuní and Amacayacu showed more variability in past vegetation change than MPA. Low-intensity, non-continuous disturbances occurred at all three plots in the past, and our results highlight the variability of past human activities both in space and time in northwestern Amazonia. Our data also suggest that post-Columbian human disturbances from the Rubber Boom (AD 1850-1920) and subsequent oil exploration have likely left stronger ecological legacies than those left by pre-Columbian peoples in our studied regions.Funding provided by: European Research CouncilCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100000781Award Number: StG 8533949Samples were collected in Yasuní Forest Dynamics Plot and analyzed at the University of Amsterdam (see Heijink et al., (2022) for more details). Phytoliths were identified using published reference photographs (Huisman et al., 2018, Morcote-Ríos et al., 2016, Piperno, 2006, Piperno and McMichael, 2020, Witteveen et al., 2022) and the phytolith reference collection of the University of Amsterdam
The Chance and Probability Concepts Project
No full textThis article, created by D.R. Green, describes an investigation of what concepts and intuitions concerning random processes are present in the minds of children of varying abilities across the 11-16 age range. The ability to list permutations, combinations and arrangements is also being investigated. The author states, "Over the past two decades the topic of 'Probabilityâ has been brought into the mathematics curriculum but it may be that this is more an empty gesture rather than a sound strategy." This article can help to alleviate many of the struggles in teaching probability concepts. The article is pitched at a more elementary audience, but is still a perfect resource for almost anyone teaching in the field
Achieving 10 ps coincidence time resolution in TOF-PET is an impossible dream
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Radiation, Science and TechnologyRST/Medical Physics & Technolog
Bepalen van het massatraagheidsmoment met behulp van een bifilar pendulum: Determining the moments of inertia using a bifilar pendulum
No full textThe aim of this thesis is to investigate the use of a bifilar pendulum for determining the moments of inertia of the TU Delft solar boat and to quantitatively predict the estimates. In the first part, several methods are discussed which can be applied in deriving the equations of motion of the pendulum. A new method, Kane's method, will be introduced. In the second part, this method will be used to derive the actual equations of motion. These equations are linearized around of the the pendulum's stationary positions to obtain expressions which link the moment of inertia about an axis to the period of oscillation of the pendulum about that axis. These equations are subsequently applied to the solar boat to derive estimates for the moments of inertia about the principle axis of the boat. The results of this thesis considers three different configurations of the bifilar pendulum with the solar boat suspended. One of these configurations results in the most accurate estimates for the moments of inertia, however, these have not been quantitatively predicted. The author suggests a modification in the definition of the bifilar pendulum such that this might be possible.Electrical Engineering, Mathematics and Computer ScienceNumerical analysi
An introduction to management science: quantitative approaches to decision making
No full textRetaining the accessible application-driven approach for which An Introduction to Management Science is highly regarded, adapting author Mik Wisniewski has carefully reworked the existing US textbook to benefit students across the UK, Europe, Middle East and Africa. Packed with diverse realistic examples from Scotland to Saudi Arabia, the landmark text from the ASW team is now available in a truly internationalised version for students studying Management Science and Operations Research at postgraduate and undergraduate level
Immunotherapy
No full textA chapter covering metastasis immunotherapy in multi-author volume devoted to all aspects of cancer metastasis
Olfactory responses of the omnivorous generalist predator Dicyphus hesperusto plant and prey odours
No full textResponses of female Dicyphus hesperus Knight (Heteroptera: Miridae) to the odours of plants and prey were tested in the laboratory using a Y-tube olfactometer. Females were attracted to the odour of tomato leaves infested with nymphs of the greenhouse whitefly, Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae), compared to uninfested leaves. No such attraction occurred to tomato leaves infested with two-spotted spider mites, Tetranychus urticae Koch (Acari: Tetranychidae). When females were simultaneously presented with the odours of whitefly and mite-infested leaves, no preference for either odour was recorded. Similarly, females were attracted to the odour of pepper leaves infested with green peach aphids [Myzus persicae (Sulzer) (Homoptera: Aphididae)] compared to uninfested leaves, but were not attracted to the odour of pepper leaves infested with eggs of cabbage loopers, Trichoplusia ni (Hübner) (Lepidoptera: Noctuidae). When aphid-infested and looper-egg-infested pepper leaves were presented simultaneously, no preference for either odour was detected. The results are discussed as they relate to the evolution of infochemical use in generalist omnivorous predators. [ABSTRACT FROM AUTHOR]Peer reviewedfinal article publishedTrialeurodes vaporariorumMiridaeHeteropterabiological controlpeppertomatoTrichoplusia niMyzus persicaeTetranychus urtica
Phytoliths in modern plants from Amazonia and the Neotropics at large. II:Enhancement of eudicotyledon reference collections
No full textPhytolith studies of Neotropical vegetation history and its human influences require large modern reference collections from diverse woody and herbaceous plants. In order to further enlarge our reference collection, we analyzed phytoliths from 435 species of eudicotyledons from 84 families and 361 genera of mainly lowland Amazonian forest taxa along with other Neotropical plants. Our analysis revealed new morphologies from the silicification of bark in arboreal taxa that don't produce diagnostic vegetative phytoliths, as well as distinctive-looking phytoliths from leaves of previously unstudied trees. Several of the phytolith types uncovered here occur as unknowns in our earlier Amazonian terrestrial soil research. No morphotypes were revealed that overlapped with diagnostic phytoliths documented previously in other families and genera. Our reference collection now totals approximately 1540 Neotropical eudicotyledon species. For the Amazonian forest below 1000m it includes 80% of eudicotyledon families often with half or more of their genera and many of the most commonly occurring trees. A significant number of herbaceous and arboreal/woody taxa can be identified at the family, genus, and possibly species level for study of Neotropical vegetational and forest history. Phytolith and palynological investigations are excellent complements to each other.</p
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