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Shield Construction Techniques in Tunnelling presents the latest on this fast, environmentally-friendly and relatively safe construction technique, reflecting on its technical risks and challenges as seen in China. Sections introduce the type of shields, the history of the technique, shielding principles, selection, management, the latest techniques in operation, consider engineering cases, discuss construction in gravel, soft-soil, composite, and rock strata, and present video clips of construction that are accessible through QR codes embedded in the text. The book combines theory and practical experience, giving the reader unique insights into shield equipment and construction techniques. The shield tunneling technique is being used very widely, particularly in China, which is building urban-rail transit systems at an unparalleled scale and speed. The use of tunneling-shields provides a fast, relatively-safe, and ecologically-friendly method for the construction of tunnels. However, a number of incidents have shown the risks involved in tunnelling through geologically complex areas. - Gives the principles and practice of shield construction techniques, including shield selection and operation - Demonstrates the latest technologies in shield construction that can be applied in practice - Reflects on the technical risks and challenges of shield construction, based on extensive use of the technique for tunnel construction in China - Discusses challenges in construction in gravel, soft-soil, composite and rock strata - Provides engineers with applicable insights into shield equipment and construction techniques
Things I've Learned About Loss offers a comforting shoulder to anyone looking for advice on how to process loss and grief. Author Dana Shields, who lost her brother in a plane crash, shares her insight and offers comfort and companionship to readers in mourning. This heartfelt book of wisdom is a beacon of hope to help readers aching to find a new normal. • Loosely guided by the stages of grief • Helps those experiencing grief feel less alone • A beautiful, simple, and sincere book on bereavement When people experience a loss, it's hard to know what to do or say. Things I've Learned About Loss helps reinforce the message that those grieving are not alone or wrong in their grief, even if it sometimes feels that way. • Features earnest content and reassurance that grief is normal • A good pick for those grieving and struggling to cope with the loss of a loved one, or for anyone who is looking for something to help and soothe their grief • You'll love this book if you love books like It's OK That You're Not OK: Meeting Grief and Loss in a Culture That Doesn't Understand by Megan Devine; There Is No Good Card for This: What to Say and Do When Life Is Scary, Awful, and Unfair to People You Love by Dr. Kelsey Crowe and Emily McDowell; and The Hot Young Widows Club: Lessons on Survival from the Front Lines of Grief by Nora McInerny.
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Mechanised shield tunnelling has developed considerably since the publication of the first edition of this book. Challenging tunnel projects under difficult conditions demand innovative solutions, which has led to constant further development and innovation in process technology, constructions operations and the machines and materials used. The book collects the latest state of technology in mechanised shield tunnelling. It describes the basics of mechanised tunnelling technology and the various types of machines and gives calculation methods and constructural advice. Further chapters cover excavation tools, muck handling, tunnel support, surveying and steering as well as workplace safety. There is also detailled information about contractual aspects and process controlling.
The mathematical theory of wave propagation along a conductor with an external coaxial return is very old, going back to the work of Rayleigh, Heaviside, and J. J. Thomson. These words were written by S. A. Schelkunoff back in 1934. Indeed, those early works dealt with signal propagation along the line as well as electromagnetic shielding of the environment inside and/or outside the metallic enclosures. Max well himself developed pioneering studies of single-layer shielding shells, while a paper with such a "modern" title as "On the Magnetic Shielding of Concentric Spherical Shells" was presented by A. W Rucker as early as 1893! * Such "state of the art" shielding theory created in the last century is even more amazing if you think that at almost the same time (namely, in 1860s), a manuscript of Jules Verne's book, Paris in the. xx Century, was rejected by a publisher because it pre dicted such "outrageously incredible" electrotechnology as, for example, FAX service by wires and the electrocutioner's chair. (With regard to the last invention, I suspect many readers would rather Jules Verne has been wrong. ) However, although the beginning of electromagnetic shielding theory and its implementation to electronic cables date back more than a century, this dynamic field keeps constantly growing, driven by practical applications.