1,981 research outputs found
COST EFFICIENT WATERPROOF TUNNEL LININGS
The last few years, several projects have been successfully lined by sprayed concrete with an embedded double-bonded spray-applied membrane. This composite single shell liner offers significant reduction of total project cost and construction time. Especially in drill and blast tunneling major cost savings are linked to reduced consumption of concrete materials when comparing with the traditional system with sheet membrane and cast in-situ concrete
Alien Registration- Rudquist, Knut F. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/31288/thumbnail.jp
On the geometry of rolling and interpolation curves on S-n, SOn, and Grassmann manifolds
We present a procedure to generate smooth interpolating curves on submanifolds, which are given in closed form in terms of the coordinates of the embedding space. In contrast to other existing methods, this approach makes the corresponding algorithm eas
The value premium, aggregate risk innovations, and average stock returns
We test whether innovations in aggregate risk, interpolated from a vector autoregressive system that contains the Chen, Roll and Ross (1986) five factors as in Petkova (2006), are common factors in cross-sectional stock returns. We provide direct evidence that innovation in industrial production growth, a classical business-cycle variable that summarizes the state of the economy, is associated with the cross-sectional return predictability of individual stocks. We conclude that the role of innovation in aggregate risk is not random, and furthermore that it provides guidance concerning an important source of nonfinancial market-based risk in asset returns
Topology counts: force distributions in circular spring networks
Filamentous polymer networks govern the mechanical properties of many
biological materials. Force distributions within these networks are typically
highly inhomogeneous and, although the importance of force distributions for
structural properties is well recognized, they are far from being understood
quantitatively. Using a combination of probabilistic and graph-theoretical
techniques we derive force distributions in a model system consisting of
ensembles of random linear spring networks on a circle. We show that
characteristic quantities, such as mean and variance of the force supported by
individual springs, can be derived explicitly in terms of only two parameters:
(i) average connectivity and (ii) number of nodes. Our analysis shows that a
classical mean-field approach fails to capture these characteristic quantities
correctly. In contrast, we demonstrate that network topology is a crucial
determinant of force distributions in an elastic spring network.Comment: 5 pages, 4 figures. Missing labels in Fig. 4 added. Reference fixe
04401 Abstracts Collection -- Algorithms and Complexity for Continuous
From 26.09.04 to 01.10.04, the Dagstuhl Seminar ``Algorithms and Complexity for Continuous Problems\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl.
During the seminar, several participants presented their current
research, and ongoing work and open problems were discussed. Abstracts of
the presentations given during the seminar as well as abstracts of
seminar results and ideas are put together in this paper. The first section
describes the seminar topics and goals in general.
Links to extended abstracts or full papers are provided, if available
Onset of Localization in Heterogeneous Interfacial Failure
We study numerically the failure of an interface joining two elastic
materials under load using a fiber bundle model connected to an elastic half
space. We find that the breakdown process follows the equal load sharing fiber
bundle model without any detectable spatial correlations between the positions
of the failing fibers until localization sets in. The onset of localization is
an instability, not a phase transition. Depending on the elastic constant
describing the elastic half space, localization sets in before or after the
critical load causing the interface to fail completely, is reached. There is a
crossover between failure due to localization or failure without spatial
correlations when tuning the elastic constant, not a phase transition. Contrary
to earlier claims based on models different from ours, we find that a finite
fraction of fibers must fail before the critical load is attained, even in the
extreme localization regime, i.e.\ for very small elastic constant. We
furthermore find that the critical load remains finite for all values of the
elastic constant in the limit of an infinitely large system.Comment: 4 pages, 5 figure
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