Observation Needs for Climate Services and Research

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Mandelbrot set in coupled logistic maps and in an electronic experiment

We suggest an approach to constructing physical systems with dynamical characteristics of the complex analytic iterative maps. The idea follows from a simple notion that the complex quadratic map by a variable change may be transformed into a set of two identical real one-dimensional quadratic maps with a particular coupling. Hence, dynamical behavior of similar nature may occur in coupled dissipative nonlinear systems, which relate to the Feigenbaum universality class. To substantiate the feasibility of this concept, we consider an electronic system, which exhibits dynamical phenomena intrinsic to complex analytic maps. Experimental results are presented, providing the Mandelbrot set in the parameter plane of this physical system.Comment: 9 pages, 3 figure

Big Corrections from a Little Higgs

We calculate the tree-level expressions for the electroweak precision observables in the SU(5)/SO(5) littlest Higgs model. The source for these corrections are the exchange of heavy gauge bosons, explicit corrections due to non-linear sigma-model dynamics and a triplet Higgs VEV. Weak isospin violating contributions are present because there is no custodial SU(2) global symmetry. The bulk of these weak isospin violating corrections arise from heavy gauge boson exchange while a smaller contribution comes from the triplet Higgs VEV. A global fit is performed to the experimental data and we find that throughout the parameter space the symmetry breaking scale is bounded by f > 4 TeV at 95% C.L. Stronger bounds on f are found for generic choices of the high energy gauge couplings. We find that even in the best case scenario one would need fine tuning of less than a percent to get a Higgs mass as light as 200 GeV.Comment: 20 pages, 5 figures included, typos fixed, comments on the effects of extra vector-like heavy fermions adde

Western Pacific international meeting and workshop on Toga Coare : proceedings

A major observational and research program is being undertaken in Darwin, Australia as part of the Tropical Ocean and Global Atmosphere (TOGA) and the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM). Darwin is situated in northern Australia and experiences a monsoon environment typical of the maritime continent region, together with break and transition periods when continental systems are predominant. The Darwin initiative follows the recent Australian Monsoon Experiment (AMEX) and Equatorial Mesoscale Experiment (EMEX) and represents a continuing effort to gather data on the nature of convection in this strategic tropical location. (Résumé d'auteur

Research data supporting "Ellipsoid localisation microscopy infers the size and order of protein layers in Bacillus spore coats."

This dataset contains image analysis software and sample image data in support of our work on fluorescent shell localisation. The paper is archived by the Cambridge Open Access repository at https://www.repository.cam.ac.uk/handle/1810/251107This work was supported by the EPSRC [grant number EP/L015889/1]