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Bridge Builders
Bridges are arguably the most symbolic of man-made structures. Unique in their balance between structural and aesthetic concerns, they offer a physical representation of unity and optimism. It is no coincidence that the dawn of this millennium has been marked all over the world by the building of bridges as the world has stepped into a new era. During this period, construction of monumental road or rail bridges has given way to a focus on the more intimate footbridge, reflecting the mounting concern for sustainability and the encouragement of healthier lifestyles. Bridge design has traditionally been the domain of the engineer, but recently architects have been increasingly involved in the f...
Membrane Structures
In this comprehensive work to date on membrane technology for architecture, pioneers show how one of the world's oldest forms of building material is also its most innovative. Today, the cutting edge in architecture is not sharp but curved and undulating. It is also impermeable to moisture, resistant to extreme temperatures, flexible and portable. Known as the fifth building material after wood, stone, glass, and metal, membranes are popping up everywhere: in Olympic stadiums in Berlin and Atlanta, in airports from Denver to Bangkok, over fashion shows, formal gardens, and soccer fields. Membranes' ability to not only let in but also reflect light portends enormous possibilities for harnessing energy. This fascinating survey of membrane structures throughout the world discusses the history of the medium, describes the materials and their uses, explores the technology of membrane construction, and investigates numerous current and future projects. A final chapter offers a reasoned argument for further research and experimentation in this rapidly expanding field and a projection of its exciting future. Illustrated throughout
Towards A New Engineering - second edition
This second-expanded edition of Towards A New Engineering is almost double in volume compared to the first edition, with several new chapters, new material and is more graphically oriented in order to guide readers more smoothly throughout the text. It is a collection of intimate reflections on structural engineering, its present and future. A testimony on many issues that ‘bothered’ the author during his years of designing structures. A critique and praise of built structures, structural design strategies, codes, the educational system, digital tools and much more. It’s a professional memoir dedicated to the unsung heroes of structural engineering. Not the unknown ones but the unrecog...
Roof Construction Manual
the Roof Construction Manual is a comprehensive reference work on the construction of pitched roofs, containing over 1800 plans and 220 photographs. Thirteen fundamental roof types and the relevant materials including thatch, wood, slate, tile, concrete, fibrous cement, bitumen, glass, metal, membranes, and synthetic materials are documented in detail. Essential topics such as ventilation, vapour and wind seals, insulation and drainage, renovation and energy conservation are examined. As with all the Construction Manuals, some 38 built examples illustrate the theoretical details, paying particular attention to important features such as the ridge, hip, eaves, roof valley, verge, and penetration. A compact presentation of the load-bearing physics and structures as well as current norms and standards make this volume an indispensable standard work for all architects and engineers.
Investigations of After Cavity Interaction in Gyrotrons Including the Effect of Non-uniform Magnetic Field
Dynamic after-cavity interaction (ACI) in megawatt-class gyrotrons is investigated that could lead to lower output mode purity and increased level of internal stray radiation. The self-consistent KIT-IHM multi-mode-code SELFT has been modified to extend the simulation domain into the radius up-taper section of the gyrotron cavity where the probability of ACI exists. Studies on four different gyrotron configurations confirm that undesired interactions in the up-taper region can result in additional parasitic oscillations with relative power in the 1%-range.
Influence of Emitter Surface Roughness and Emission Inhomogeneity on Efficiency and Stability of High Power Fusion Gyrotrons
The increasing demand for powerful, reliable, and efficient gyrotron oscillators for Electron Cyclotron Resonance Heating (ECRH) in fusion plasma experiments requires a close look at the various factors in gyrotrons that determine gyrotron performance. In this frame, the influence of emitter surface roughness, emission inhomogeneity, and secondary electron generation on gyrotron operation is presented, with focus on Low Frequency Oscillations (LFOs) and Electron Beam Halo (EBH) generation.
MultPhysics Modelling towards the Stabilization of PAN Fibers with Microwaves Based on Experimental Data
High energy demand is one reason for high costs of carbon fibers. One option to decrease them is to use microwave heating instead of conventional heating. In this work, steps towards a microwave assisted process during the stabilization phase are presented. In-situ dielectric measurements are performed and a reaction kinetics model is setup in connection to the dielectric loss. This allows to calculate a stabilization degree and fiber temperatures leading to a basic process understanding.
Design and Experimental Investigation of a Second Harmonic 20 kW Class 28 GHz Gyrotron for Evaluation of New Emitter Technologies
Gyrotrons are high-power mm-wave tubes. Here, the design, construction and experimental investigation of a 20 kW, 28 GHz gyrotron (2nd harmonic) are reported. This tube was designed to evaluate new emitters for future highly efficient and reliable fusion gyrotrons and for material processing applications. Following experimental results have been achieved in CW operation: 22.5 kW output power at 23.4 kV electron beam voltage and 2.23 A beam current with the world record efficiency of 43 %.
