Kevin Li – författare

This is the first fully comprehensive survey and analysis of masted structures and covers examples that have evolved during the past three decades.Masted Structures are one of the most interesting developments in post-war architecture resulting from a combination of technology, structural engineering theory and a collaboration between architects and engineers.This is an essential guide for architects to the structural and constructional implications of masted forms in relation to space enclosure, patterns of loading and use of differing materials and techniques. This useful volume will enable architects and engineers to understand the origins, development and nature of masted structures and will provide a stimulating basis for future design.

This is the first fully comprehensive survey and analysis of masted structures and covers examples that have evolved during the past three decades.Masted Structures are one of the most interesting developments in post-war architecture resulting from a combination of technology, structural engineering theory and a collaboration between architects and engineers.This is an essential guide for architects to the structural and constructional implications of masted forms in relation to space enclosure, patterns of loading and use of differing materials and techniques. This useful volume will enable architects and engineers to understand the origins, development and nature of masted structures and will provide a stimulating basis for future design.

This is the first fully comprehensive survey and analysis of masted structures and covers examples that have evolved during the past three decades.Masted Structures are one of the most interesting developments in post-war architecture resulting from a combination of technology, structural engineering theory and a collaboration between architects and engineers.This is an essential guide for architects to the structural and constructional implications of masted forms in relation to space enclosure, patterns of loading and use of differing materials and techniques. This useful volume will enable architects and engineers to understand the origins, development and nature of masted structures and will provide a stimulating basis for future design.

This is the first fully comprehensive survey and analysis of masted structures and covers examples that have evolved during the past three decades.Masted Structures are one of the most interesting developments in post-war architecture resulting from a combination of technology, structural engineering theory and a collaboration between architects and engineers.This is an essential guide for architects to the structural and constructional implications of masted forms in relation to space enclosure, patterns of loading and use of differing materials and techniques. This useful volume will enable architects and engineers to understand the origins, development and nature of masted structures and will provide a stimulating basis for future design.

Research Paper (postgraduate) from the year 2014 in the subject Physics - Optics, University of California, Berkeley , language: English, abstract: The transmission electron microscope is an indispensable tool in science, with applications across medicine, materials science, and geology, among others. However, it is limited in its ability to operate with Zernike phase contrast, a technology commonplace in light microscopy. Zernike phase contrast can be obtained, but only by using carbon-film phase plates or similar methods, all of which are short-lived. Electrons moving close to the speed of light cause damage as they bombard the phase plates. The phase plates need to be replaced frequently, which introduces inconsistencies due to variations between the plates as they are replaced. The purpose of this paper is to demonstrate the plausibility of utilizing ponderomotive forces within an optical cavity to achieve phase contrast, creating a laser-based phase plate, thereby replacing the carbon films and eliminating swapping. We approach this problem by using a Fabry-Perot to concentrate the laser power to be able to achieve the necessary electron phase shift with conventional CO2 lasers. We demonstrate a cavity with finesse of ~24000 and numerical aperture of ~.016, and calculate the laser power needed to be supplied to be ~19W, well within the state of art. These results demonstrate the practicality of laser-based electron microscope phase plates.