1,980 research outputs found
On the conceptual feasibility of a CAAD-CAAI integrated decision support system: A computer aided environment for technical decision-making in architecture
No full textArchitectur
Deformation and melt in natural mantle rocks: The Hilti Massif (Oman) and the Othris Massif (Greece)
No full textFor a full understanding of plate tectonics, one of the
central paradigms in Earth Sciences, it is critical to
know the mechanical properties of the material of
which the earth's upper mantle consists, i.e., peridotite.
The cold outer shell of the Earth, the lithosphere, is
broken up into strong and almost rigid plates, which
can move with relatively little resistance over a weak
substratum in the upper mantle, the asthenosphere. The
weakness of the asthenosphere is primarily caused by
the high, near-solidus ambient temperature in this
zone. However, questions remain as to the effects of
the presence of small fractions of molten material
('melt') on the deformation properties and strength of
these asthenospheric peridotites. Recent laboratory
experiments have shown that small amounts of melt (4-
ro%) can have a drastic weakening effect on peridotitelike
materials. If this weakening effect of melt plays a
role in the earth's upper mantle, then the asthenosphere
could be significantly weaker than commonly believed.
The current research was therefore initiated, aiming to
investigate the factors which govern melt-weakening of
peridotites and to determine whether evidence could
be found for melt-weakening in natural peridotites
deformed under asthenospheric conditions. However,
samples from the asthenosphere are generally
unavailable, mainly because of the great depth of this
zone (generally >roo km). Only at mid-ocean ridges,
the asthenosphere reaches relatively shallow levels of
only a few kilometres. Ophiolites, fossil fragments of
mid-ocean ridges, occasionally emplaced onto
continents as a result of the closure and disappearance
of oceans during the earth's geological history, are
therefore the most suitable source of samples of upper
mantle rocks deformed under asthenospheric
conditions. Peridotites in ophiolites can thus provide a
window into the asthenosphere, provided that the
effects of deformation related to emplacement of the
ophiolite superimposed on asthenospheric deformation
can be distinguished and that relics of the early asthenospheric deformation have been preserved.
This thesis comprises a detailed geological study of
peridotites found in two ophiolites, the Oman
Ophiolite (Oman) and the Othris Ophiolite (Greece).
Both ophiolites represent remnants of an ancient ocean,
the Neotethys, which existed in Mesozoic times.
Structural geological and lithological maps and sections
of selected areas were made, and rock samples were
subjected to detailed microstructural and petrographic
analysis using light microscopy, electron microscopy,
and chemical (electron microprobe) analysis
A letter to A.H. Esq., concerning the stage [electronic resource]
No full textA defense of the stage, in answer to Jeremy Collier's Short view of the immorality and profaneness of the English stage."The initials in the title [i.e. A.H.] have been identified as those of Anthony Hammond. Charles Hopkins has been suggested as the probable author." Cf. NUC pre-1956.Reproduction of original in Huntington Library.WingElectronic reproduction
De kosten van een zandsuppletie op het strand van de Kop van Goeree uitgevoerd met behulp van de zogenaamde "Punaise"
No full textIn het 1e deel van het afstudeerverslag van A.H. van Berk (lit. 1) werd de vraag gesteld of een baggersysteem voor het kustonderhoud van de Kop van Goeree met de punaise (fig. 0) in één van de wingebieden A, B of C (fig. 2) kan konkurreren met een systeem met een cutterzuiger in wingebied E. Voor het antwoord op deze vraag zijn de kosten van zowel de uitvoering met de punaise als die met de cutterzuiger bepaald. Deze kosten zijn omgerekend naar de gemiddelde jaarlijkse kosten voor het kustonderhoud en onderling vergeleken. In het tweede deel wordt een handleiding gegeven voor de berekening van de jaarlijkse kosten van het kustonderhoud van de lop van Goeree door zandsuppietie a.b.v. de Punaise.Hydraulic EngineeringCivil Engineering and Geoscience
Determinanten van kennisintensieve onderzoeks- en ontwikkelingssamenwerking
No full textIt is becoming increasingly important for companies to ensure a continuing supply of new knowledge. The development of innovative production processes and marketing strategies as well as better products and services improves the competitive position of firms on the world market. This is of special interest to Dutch firms who have only a small and open home market. The principal research question addressed in this thesis concerns the determinants that influence companies in their choice of whether or not to enter into a knowledge-intensive research and development collaboration. This thesis also looks in detail at the role of publicly financed research institutions such as universities, in the setting of the company innovation process as well as at cooperation among private firms. About 13% of all innovative firms in the Netherlands are engaged in some sort of knowledge-intensive research and development collaboration. Knowledge spillovers are an important reason to reject collaboration as a means of acquiring knowledge because spillovers worsen the appropriability conditions, thus decreasing the economic benefits gained from innovative efforts. In correspondence with the literature we find that a high level of R&D-intensity of the partners involved is a very important prerequisite for entering into knowledge intensive R&D-collaboration. Furthermore an important finding is that the probability of entering into a knowledge-intensive R&D-collaboration increases proportionally to the size of the firm. Most innovative firms choose to be engaged in both private and public types of knowledge intensive R&D-collaboration. From this it can be concluded that public and private types of collaboration are complementary to one another. Knowledge intensive R&D-collaboration is also of strategic importance making the decision whether to introduce either improved or newly-developed products onto the market. Firms engaged in knowledge intensive R&D-collaboration more often choose to introduce new products instead of improved products onto the market.Technology, Policy and Managemen
Experiments on nulcides decaying by position emission and electron caputure
No full textApplied Science
Metingen met een proportionele teller bij beta-desintegratie
No full textElectrical Engineering, Mathematics and Computer Scienc
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