Author: Kees van KersbergenPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Expansion and Fragmentation
Heathland fragmentation and the potential for expansion
Author: N R. WebbFragmentation of Rings and Shells
Author: Dennis GradyPublisher: Springer Science & Business Media
ISBN: 3540271457
Category : Technology & Engineering
Languages : en
Pages : 375
Book Description
For a brief period during the latter part of World War II, Nevill F. Mott led a theoretical group at Fort Halstead in the United Kingdom that tackled scientific issues related to pressing war-time concerns. Among later awards and honors, Mott was knighted and a recipient of the Nobel Prize. While at Fort Halstead, he undertook an effort to theoretically describe the statistical fragmentation of munitions subjected to intense explosive loading. Mott`s original internal reports contain seminal theoretical concepts on the physics and statistics of dynamic fracture and fragmentation, which have provided the inspiration for numerous later modeling efforts and engineering formulae. Some of his most forward-looking thoughts on the micromechanical and molecular aspects of fracture are included in these publications. The present book surveys the theoretical analysis put forth by Mott with particular focus on his efforts to characterize the size and distribution of fragments resulting from a dynamic fragmentation event. Copies of the original internal reports of Mott and his co-workers are included. The book also pursues additional theoretical analysis with the intent of delving further into the physical ideas and unfinished analysis implicit in Mott`s original studies. This book will be of interest to all scientists and engineers concerned with the dynamic fracture and fragmentation of solid bodies subject to intense transient loads imparted by explosive detonation and high-velocity impact from both the historical and modern perspective.
Cylinder Expansion (Gurney Constant) and Warhead Fragmentation. Part 2. Computerized Data Reduction
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 78
Book Description
Development of a cylinder expansion test for use in assessing the metal acceleration capability of explosives is discussed. A precisely manufactured metal cylinder is filled with explosive, and its wall expansion during detonation is observed with a streak camera. The photographic record of the cylinder expansion is analyzed by mechanized film reading and high speed computer techniques. The maximum velocity attained by the wall fragments is taken as a measure of the momentum imparted to the metal by the explosive. Both manual and automated methods of data reduction for attainment of test results are given. When standardized, this test procedure will permit the correlation of the evaluations of explosive compounds between laboratories. The computerized reduction of the pictorial data to tabular listings and graphic displays is also discussed.
Dynamical Effects in the Coulomb Expansion Following Nuclear Fragmentation
Author: K. C. ChungGovernance Fragmentation and Urban Spatial Expansion
Author: Silvia BeghelliPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This study assesses the effects of urban governance structure on the spatial expansion of metropolitan areas. A more fragmented governance structure, represented by a high number of administrative units with decision power on land use per inhabitant, is expected to increase the competition between small towns in the suburbs of metropolitan areas to attract households and workers, which, in turn, induces more land uptake. We study empirically the relationship between administrative fragmentation and the spatial size of cities in a sample of 180 metropolitan areas in the contexts of the US and Europe in the period 2000-2012. Results shed light on the structural differences between the two broad regions and suggest that administrative fragmentation impacts positively on land uptake in both the United States and Europe, although to different extents.
Habitat Fragmentation and Landscape Change
Author: David B. LindenmayerPublisher: Island Press
ISBN: 159726606X
Category : Nature
Languages : en
Pages : 349
Book Description
Habitat loss and degradation that comes as a result of human activity is the single biggest threat to biodiversity in the world today. Habitat Fragmentation and Landscape Change is a groundbreaking work that brings together a wealth of information from a wide range of sources to define the ecological problems caused by landscape change and to highlight the relationships among landscape change, habitat fragmentation, and biodiversity conservation. The book: synthesizes a large body of information from the scientific literature considers key theoretical principles for examining and predicting effects examines the range of effects that can arise explores ways of mitigating impacts reviews approaches to studying the problem discusses knowledge gaps and future areas for research and management Habitat Fragmentation and Landscape Change offers a unique mix of theoretical and practical information, outlining general principles and approaches and illustrating those principles with case studies from around the world. It represents a definitive overview and synthesis on the full range of topics that fall under the widely used but often vaguely defined term "habitat fragmentation."
Insurgent Fragmentation in the Horn of Africa
Author: Michael WoldemariamPublisher: Cambridge University Press
ISBN: 1108534384
Category : Political Science
Languages : en
Pages : 334
Book Description
When insurgent organizations factionalize and fragment, it can profoundly shape a civil war: its intensity, outcome, and duration. In this extended treatment of this complex and important phenomenon, Michael Woldemariam examines why rebel organizations fragment through a unique historical analysis of the Horn of Africa's civil wars. Central to his view is that rebel factionalism is conditioned by battlefield developments. While fragmentation is caused by territorial gains and losses, counter-intuitively territorial stalemate tends to promote rebel cohesion and is a critical basis for cooperation in war. As a rare effort to examine these issues in the context of the Horn of Africa region, based upon extensive fieldwork, this book will interest both scholarly and non-scholarly audiences interested in insurgent groups and conflict dynamics.
Generalized Many-body Expansion
Author: Kuan-Yu LiuPublisher:
ISBN:
Category : Chemistry, Physical and theoretical
Languages : en
Pages : 105
Book Description
In this work, we explore several promising aspects of generalized many-body expansion (GMBE) for computing energies and energy responses of large systems. The GMBE is recognized as one of the fragment-based methods and provides a unified view of those methods in electronic structure theory. The four elements shared by other fragment-based methods include a fragmentation method, a capping method, an embedding method, and the number of layer. We utilize the last two elements as well as the screening to approximate the non-additive many-body interactions. We found that energy-based thresholding affords linear scaling and high accuracy without embedding and multi-layer approximations. For the charge embedding scheme, the variational electrostatic embedded one-body approximation alongside symmetry-adapted perturbation theory proves promising for non-covalent interactions with the newly implemented modified Hirshfeld population analysis. We are able to reduce the cost for calculation the charge response term without compromising accuracy. The two prominent results of the GMBE show that we can apply this fragment-based method to relatively large systems due to its excellent parallel ability. Since the preliminary results of frequency calculations show the robustness of finite difference implementation, we are also looking forward to applying this methodology to energy responses such as spectroscopies.
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