6,250 research outputs found

    Development of an Atomic Force Microscope

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    This abstract presents the development of an Atomic Force Microscope (AFM) vertical scanner for surface topography measurements, which is composed of a single axis positioning stage with an integrated metrology system and AFM probe. The scanner is meant to track and measure a maximum topography step of 10 ?m with a measurement resolution of less then 0.1 nm and an uncertainty of less than 10 nm (1←) at a controllable bandwidth of at least 2 kHz.Precision and Microsystems EngineeringMechanical, Maritime and Materials Engineerin

    Concrete Flow in Diaphragm Wall Panels: A Full-Scale In-Situ Test

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    Flow processes, taking place during the concreting of diaphragm wall panels (D-wall panels), are of great importance for the quality of the wall. During this phase, the bentonite, present in the excavated trench, should be completely replaced by concrete in a controlled way. In literature several cases are described in which this process resulted in bentonite inclusions in the panel. These inclusions often lead to severe problems, like leakages, for the building pit to be excavated within the diaphragm wall panels. Beside the risks for the building pit, leakages caused by bentonite inclusions can also have large consequences for nearby constructions. In this article, set up and results of a full-scale diaphragm wall test are described. Conclusions are drawn with regard to the influence of several parameters on the flow process and subsequently on the quality of the wall and the risk on bentonite inclusions

    Letter from J.W. Cook to Thomas Lamb Eliot

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    https://rdc.reed.edu/v1/resources/5e17b7c9-4bca-4fcf-8784-0915783532dd/thumb/128.jpgIt is possible that the author is James W. Cook, who was an important figure in the establishment of the Portland Unitarian Church

    Letter from J.W. Cook to Thomas Lamb Eliot

    No full text
    https://rdc.reed.edu/v1/resources/c9f13811-9c93-449b-8b79-31dd26e7a981/thumb/128.jpgIt is probable that the author is James W. Cook, who was an important figure in the establishment of the Portland Unitarian Church

    Letter from J.W. Cook to Thomas Lamb Eliot

    No full text
    https://rdc.reed.edu/v1/resources/413865c0-390a-449d-9d4e-f69f66754b8e/thumb/128.jpgIt is possible that the author is James W. Cook, who was an important figure in the establishment of the Portland Unitarian Church

    Verification of BREAKWAT for berm breakwaters and low-crested structures

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    This report describes the verification of the model on dynamic stability for berm breakwaters. The model runs on a pc and is called BREAKWAT. The data received from various people allover the world contained not only berm breakwaters, but also dynamically stable low-crested structures. The title of the report was therefore changed to "Verification of BREAKWAT for berm breakwaters and low-crested structures". The calculations were performed and the report was written by Dr. J.W. van der Meer of Delft Hydraulics

    Letter from J.W. Cook to Thomas Lamb Eliot

    No full text
    https://rdc.reed.edu/v1/resources/48a1abe6-3896-473b-bc17-0796ead5e587/thumb/128.jpgIt is probable that the author is James W. Cook, who was an important figure in the establishment of the Portland Unitarian Church
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