Download21st-Century TunnelsPDF

Home   /   Download21st-Century TunnelsPDF
Download21st-Century TunnelsPDF

21st-Century Tunnels
by LeeAnn Blankenship

As cities grow and Earth becomes more congested with millions of miles of roads and railways, tunnels offer access to some of our last available space. They pass through massive mountains, beneath bodies of water, and even under large cities. This resource introduces readers to underground engineering and explains how it works in connection with other disciplines to solve problems of tunnel design, safety, construction, and sustainability. No doubt tunnels of the future will revolutionize transportation and address other global issues. This insightful resource will inspire readers to consider a career in engineering so they can help make it happen.

Congressional Serial Set
by

Reports, Documents, and Journals of the U.S. Senate and House of Representatives.

Technological Trends and National Policy
by United States. National Resources Committee. Science Committee


Engineering News-record
by


The Railway News …
by


Engineering News
by


Great Scientific Achievements
by Salem Press

Arranged in chronological order from the mid 1880s to 1994 which discuss scientific developments, discoveries, innovations and inventions ; covers subjects such as global warming, big bang theory, radioactivity, repair of Hubble space telescope, etc. ; each of the 10 volumes also contain 4 indexes : chronological list, alphabetical and key word list, a category list, and a personages index ; the final volume includes a subject index.

Tunneling Dynamics in Open Ultracold Bosonic Systems
by Axel U. J. Lode

This thesis addresses the intriguing topic of the quantum tunnelling of many-body systems such as Bose-Einstein condensates. Despite the enormous amount of work on the tunneling of a single particle through a barrier, we know very little about how a system made of several or of many particles tunnels through a barrier to open space. The present work uses numerically exact solutions of the time-dependent many-boson Schrödinger equation to explore the rich physics of the tunneling to open space process in ultracold bosonic particles that are initially prepared as a Bose-Einstein condensate and subsequently allowed to tunnel through a barrier to open space. The many-body process is built up from concurrently occurring single particle processes that are characterized by different momenta. These momenta correspond to the chemical potentials of systems with decreasing particle number. The many-boson process exhibits exciting collective phenomena: the escaping particles fragment and lose their coherence with the source and among each other, whilst correlations build up within the system. The detailed understanding of the many-body process is used to devise and test a scheme to control the final state, momentum distributions and even the correlation dynamics of the tunneling process.

Building and Engineering News
by


Conversations with Heaven
by Theresa Cheung

Based on her own personal experiences and the experiences of ordinary people, bestselling author Theresa Cheung gathers together a collection of comforting and startling stories about contact with the departed. The theme that runs through this book is that the world of spirit is ever present in our lives, and it is possible to reconnect with those we have loved and lost. Using first-hand accounts from people whose lives have been transformed by communication from those who have passed on, Theresa shows that you can begin your own dialogue with heaven, offering comfort to those grappling with the loss of a loved one. The book concludes with a ‘how to’ section to help readers find their own way to talk to heaven.