Basin stability approach for quantifying responses of multistable systems with parameters mismatch

Acknowledgement This work is funded by the National Science Center Poland based on the decision number DEC-2015/16/T/ST8/00516. PB is supported by the Foundation for Polish Science (FNP).Peer reviewedPublisher PD

The study of the attitude control of small satellites and related subsystems. Volume 2 - System and subsystem technical releases Final report

Baseline system definition of attitude control for small satellites and related subsystem

The study of the attitude control of small satellites and related subsystems. Volume 1 - Summary Final report

Engineering studies of attitude control of small satellites and related subsystem

Sample-based approach can outperform the classical dynamical analysis - Experimental confirmation of the basin stability method

In this paper we show the first broad experimental confirmation of the basin stability approach. The basin stability is one of the sample-based approach methods for analysis of the complex, multidimensional dynamical systems. We show that investigated method is a reliable tool for the analysis of dynamical systems and we prove that it has a significant advantages which make it appropriate for many applications in which classical analysis methods are difficult to apply. We study theoretically and experimentally the dynamics of a forced double pendulum. We examine the ranges of stability for nine different solutions of the system in a two parameter space, namely the amplitude and the frequency of excitation. We apply the path-following and the extended basin stability methods (Brzeski et al., Meccanica 51(11), 2016) and we verify obtained theoretical results in experimental investigations. Comparison of the presented results show that the sample-based approach offers comparable precision to the classical method of analysis. However, it is much simpler to apply and can be used despite the type of dynamical system and its dimensions. Moreover, the sample-based approach has some unique advantages and can be applied without the precise knowledge of parameter values

Erratum: Sample-based approach can outperform the classical dynamical analysis - experimental confirmation of the basin stability method

The original version of this Article contained a typographical error in the spelling of the author T. Kapitaniak, which was incorrectly given as T. Kapitaniakenglish. This has now been corrected in the PDF and HTML versions of the Article

Hidden evidence of non-exponential nuclear decay

The framework to describe natural phenomena at their basics being quantum mechanics, there exist a large number of common global phenomena occurring in different branches of natural sciences. One such global phenomenon is spontaneous quantum decay. However, its long time behaviour is experimentally poorly known. Here we show, that by combining two genuine quantum mechanical results, it is possible to infer on this large time behaviour, directly from data. Specifically, we find evidence for non-exponential behaviour of alpha decay of 8Be at large times from experiments.Comment: 12 pages LaTex, 3 figure

Rediscovery of red wolf ghost alleles in canid population along the American Gulf Coast

Rediscovering species once thought to be extinct or on the edge of extinction is rare. Red wolves have been extinct along the American Gulf Coast since 1980, with their last populations found in coastal Louisiana and Texas. We report the rediscovery of red wolf ghost alleles in a canid population on Galveston Island, Texas. We analyzed over 7000 single nucleotide polymorphisms (SNPs) in 60 canid representatives from all legally recognized North American Canis species and two phenotypically ambiguous canids from Galveston Island. We found notably high Bayesian cluster assignments of the Galveston canids to captive red wolves with extensive sharing of red wolf private alleles. Today, the only known extant wild red wolves persist in a reintroduced population in North Carolina, which is dwindling amongst political and taxonomic controversy. Our rediscovery of red wolf ancestry after almost 40 years introduces both positive opportunities for additional conservation action and difficult policy challenges

Dynamical response of a rocking rigid block

This is the author accepted manuscript. The final version is available from AIP Publishing via the DOI in this recordData accessibility: The data that support the findings of this study are available from the corresponding author upon reasonable request.This paper investigates the complex dynamical behavior of a rigid block structure under harmonic ground excitation, thereby mimicking, for instance, the oscillation of the system under seismic excitation or containers placed on a ship under periodic acting of sea waves. The equations of motion are derived assuming a large frictional coefficient at the interface between the block and the ground, in such a way that sliding cannot occur. In addition, the mathematical model assumes a loss of kinetic energy when an impact with the ground takes place. The resulting mathematical model is then formulated and studied in the framework of impulsive dynamical systems. Its complex dynamical response is studied in detail using two different approaches, based on direct numerical integration and path-following techniques, the latter implemented via the continuation platform COCO (Dankowicz & Schilder). Our study reveals the presence of various dynamical phenomena, such as branching points, fold and period-doubling bifurcation of limit cycles, symmetric and asymmetric periodic responses, as well as chaotic motion. By using basin stability method we also investigate the properties of solutions and their ranges of existence in phase and parameters spaces. Moreover, the study considers ground excitation conditions leading to the overturning of the block structure and shows parameters regions wherein such behavior can be avoidedEngineering and Physical Sciences Research Council (EPSRC)National Science Centre, Polan

Institutional Real Estate Investment Practices: Swedish and United States Experiences

In recent years, institutional real estate investment activity has experienced major changes in many countries throughout the world. In Sweden, large-scale investment projects have increasingly been dominated by several major financial institutions. As in other places, real estate investment analysis in Sweden has undergone considerable change in terms of rigor, focus, and perspective. This study is the first effort ever to systematically assess the current situation in the market for commercial real estate in Sweden. The study presents the results of a comprehensive 1988 survey of over 200 commercial real estate investment participants in Sweden including insurance companies, pension funds, construction firms, property management firms, and investment companies. The survey results are compared with results reported in the United States and elsewhere within the corporate and real estate capital budgeting literatures. The results reported here can thus be compared cross-sectionally as well as over time across numerous dimensions.

Functional diversification of maize RNA polymerase IV and V subtypes via alternative catalytic subunits.

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