Memory Effect, Rejuvenation and Chaos Effect in the Multi-layer Random Energy Model

We introduce magnetization to the Multi-layer Random Energy Model which has a hierarchical structure, and perform Monte Carlo simulation to observe the behavior of ac-susceptibility. We find that this model is able to reproduce three prominent features of spin glasses, i.e., memory effect, rejuvenation and chaos effect, which were found recently by various experiments on aging phenomena with temperature variations.Comment: 10 pages, 14 figures, to be submitted to J. Phys. Soc. Jp

Precision Determination of the Neutron Spin Structure Function g1n

We report on a precision measurement of the neutron spin structure function $g^n_1$ using deep inelastic scattering of polarized electrons by polarized ^3He. For the kinematic range 0.014<x<0.7 and 1 (GeV/c)^2< Q^2< 17 (GeV/c)^2, we obtain $\int^{0.7}_{0.014} g^n_1(x)dx = -0.036 \pm 0.004 (stat) \pm 0.005 (syst)$ at an average $Q^2=5 (GeV/c)^2$. We find relatively large negative values for $g^n_1$ at low $x$. The results call into question the usual Regge theory method for extrapolating to x=0 to find the full neutron integral $\int^1_0 g^n_1(x)dx$, needed for testing quark-parton model and QCD sum rules.Comment: 5 pages, 3 figures To be published in Phys. Rev. Let

The Spin Structure of the Nucleon

We present an overview of recent experimental and theoretical advances in our understanding of the spin structure of protons and neutrons.Comment: 84 pages, 29 figure

Understanding the growth in outdoor recreation participation: an opportunity for sport development in the United Kingdom

© 2018, © 2019 Informa UK Limited, trading as Taylor & Francis Group. This paper examines the growth in importance and scale of the outdoor recreation sector in the United Kingdom. It establishes a five-component model to help understand the growth in this sub-sector of the wider sport and physical activity industry. The paper is based on a narrative literature review of the importance of outdoor recreation and also sets the position of the sector in terms of sport policy in the UK. From determining the factors that are underpinning the growing importance of the sector the article goes on to establish implications for policy and practice in sport policy and development in the UK and beyond. It seeks to establish lesson learning between industry and academia that has underpinned the evolution of outdoor recreation policy development in recent years. Furthermore, it establishes future research agendas and directions for those working in outdoor recreation and physical activity spaces and places