Further search for a neutral boson with a mass around 9 MeV/c2

Two dedicated experiments on internal pair conversion (IPC) of isoscalar M1 transitions were carried out in order to test a 9 MeV/c2 X-boson scenario. In the 7Li(p,e+e-)8Be reaction at 1.1 MeV proton energy to the predominantly T=0 level at 18.15 MeV, a significant deviation from IPC was observed at large pair correlation angles. In the 11B(d,n e+e-)12C reaction at 1.6 MeV, leading to the 12.71 MeV 1+ level with pure T=0 character, an anomaly was observed at 9 MeV/c2. The compatibility of the results with the scenario is discussed.Comment: 12 pages, 5 figures, 2 table

Adaptation, interaction and urgency:a complex evolutionary economic geography approach to leisure

Local and regional governments in western European peripheral areas aim to spur leisure-led regional development. We explore planning for leisure by applying an evolutionary economic geography (EEG) approach from a complexity perspective. We identify conditions which enable and constrain leisure development and its effects on the region as a whole. This means combining the local level of individual adaptations with the institutional setting and with the regional scale. We examine the Dutch province of Fryslan and explore by means of case study analysis how current leisure development processes can be explained in a complex evolutionary manner. We explore economic novelty as a result of individual adaptations; how such adaptations through interactions create emerging spatial patterns; how these spatial patterns form self-organizing new types of order; and the way this process is dependent on previous paths whilst also creating new pathways. Our findings show that although development is dependent on individual adaptations often stemming from a few actors, for such adaptations to have an effect on the region requires a connectivity between actors and a sense of urgency amongst those actors. Using a complex EEG approach allows us to explain leisure-led regional development as the product of these conditions. This can help planners deal with the complexity and unpredictability of this process, focusing not on a desired end goal as such, but on creating the conditions in which a more autonomous development can take place

Complexity theories and ethnographies in planning for leisure-led regional development

Leisure-led regional development refers to leisure as a mechanism to achieve broad societal goals within a region: economic revenue, employment and service levels but also cultural or conservationist ambitions. Engaging in such leisure-led regional development proves a complex matter. Based on ethnographies of leisure in the Dutch province of Fryslân conducted over a five-year period between 2013 and 2018, this paper argues that combining theoretical understanding of complexity theories with analyses based on both evolutionary and discursive approaches results in enhanced understanding of the interactions shaping uncertainty in leisure development. Results of field observations, interviews, participation and document analysis show that planning for leisure-led regional development should consider autonomous and evolutionary processes, whilst focusing on purposefully influencing the interactions and perspectives of actors in leisure. More precisely, this means shaping the narratives and practices in these institutions which make specific interactions more likely to develop. This can be undertaken by including in planning efforts the individual perspectives and emotions among actors in the regional leisure sector. To cope with uncertainty at the heart of leisure-led regional development, an adaptive strategy should be adopted, both in the planning efforts taken and in how such efforts are monitored and evaluated.</p

Achievable rates for the Gaussian quantum channel

We study the properties of quantum stabilizer codes that embed a finite-dimensional protected code space in an infinite-dimensional Hilbert space. The stabilizer group of such a code is associated with a symplectically integral lattice in the phase space of 2N canonical variables. From the existence of symplectically integral lattices with suitable properties, we infer a lower bound on the quantum capacity of the Gaussian quantum channel that matches the one-shot coherent information optimized over Gaussian input states.Comment: 12 pages, 4 eps figures, REVTe

Biomarkers of caspofungin resistance in Candida albicans isolates : A proteomic approach

Acknowledgments We would like to acknowledge Dr. Donna MacCallum and Dr. Markus Kostrzewa for providing strains for this work. Funding The work was supported by the Horizon 2020 [847507]; 610 H2020 Marie Skłodowska-Curie Actions [H2020-MSCAITN-2014-642095]; H2020 Marie Skłodowska-Curie Actions [812969].Peer reviewedPublisher PD

Introducing a closed system approach for the investigation of chemical steps involving proton and electron transfer; as illustrated by a copper-based water oxidation catalyst

Solid state NMR/Biophysical Organic Chemistr

Modulating spin transfer torque switching dynamics with two orthogonal spin-polarizers by varying the cell aspect ratio

We study in-plane magnetic tunnel junctions with additional perpendicular polarizer for subnanosecond-current-induced switching memories. The spin-transfer-torque switching dynamics was studied as a function of the cell aspect ratio both experimentally and by numerical simulations using the macrospin model. We show that the anisotropy field plays a significant role in the dynamics, along with the relative amplitude of the two spin-torque contributions. This was confirmed by micromagnetic simulations. Real-time measurements of the reversal were performed with samples of low and high aspect ratio. For low aspect ratios, a precessional motion of the magnetization was observed and the effect of temperature on the precession coherence was studied. For high aspect ratios, we observed magnetization reversals in less than 1 ns for high enough current densities, the final state being controlled by the current direction in the magnetic tunnel junction cell.Comment: 6 pages, 7 figure

Energetic Effects of a Closed System Approach Including Explicit Proton and Electron Acceptors as Demonstrated by a Mononuclear Ruthenium Water Oxidation Catalyst

Solid state NMR/Biophysical Organic Chemistr

Discrete radar ambiguity problems

In this paper, we pursue the study of the radar ambiguity problem started in \cite{Ja,GJP}. More precisely, for a given function $u$ we ask for all functions $v$ (called \emph{ambiguity partners}) such that the ambiguity functions of $u$ and $v$ have same modulus. In some cases, $v$ may be given by some elementary transformation of $u$ and is then called a \emph{trivial partner} of $u$ otherwise we call it a \emph{strange partner}. Our focus here is on two discrete versions of the problem. For the first one, we restrict the problem to functions $u$ of the Hermite class, $u=P(x)e^{-x^2/2}$, thus reducing it to an algebraic problem on polynomials. Up to some mild restriction satisfied by quasi-all and almost-all polynomials, we show that such a function has only trivial partners. The second discretization, restricting the problem to pulse type signals, reduces to a combinatorial problem on matrices of a special form. We then exploit this to obtain new examples of functions that have only trivial partners. In particular, we show that most pulse type signals have only trivial partners. Finally, we clarify the notion of \emph{trivial partner}, showing that most previous counterexamples are still trivial in some restricted sense

Ab initio molecular dynamics of retinals

A Car-Paninello ab initio molecular dynamics calculation is presented of all-trans and 11-cis retinals. The minimum energy configurations of the two isomers have been determined by a simulated annealing procedure. The backbone conjugation is properly described within the local density approximation. The vibrational frequencies have been determined from the molecular dynamics trajectories. The theoretical results show an excellent agreement with experiment and provide grounds for an analysis of the retinal vibrations in terms of localized modes.Solid state NMR/Biophysical Organic Chemistr