Leading with vision is critical to the success of schools. The purpose of this book is to define and describe vision-based educational leadership. The book proposes the model of a learning school in ...which everyone is a learner. Chapter 1 discusses the ways in which vision drives educational leadership, the organization of the schools, and learning in the school. Chapter 2 provides a brief review of philosophical thought and the contribution of psychologists to the definition of learning and knowledge. Chapter 3 provides an understanding of how learning theory and research have a direct influence on one's vision of educational processes and outcomes. Chapter 4 focuses on the role of leadership in the learning school, based on the works of Peter Senge and Thomas Sergiovanni. Chapter 5 presents a model for a learning school that consists of four integrated elements: shared vision, authentic teaching and learning, supportive school organization, and assessment. Chapter 6 describes a process for developing a shared governance of the learning community. In chapter 7, four examples depict the ways in which leaders engaged others to develop a shared vision. Chapter 8 reviews lessons learned in developing a shared vision. Guidelines to engage the broader community in building and maintaining a learning community are offered in chapter 9. Seven figures and an index are included. Appendices contain a sample school-district analysis of probability statements, a district scenario, and methods for evaluating visions. (Contains 84 references.) (LMI)
The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles ...and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the simplest picture account only for a few percent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions where a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, since their masses are quite similar and small compared to the mass of the proton. In the present manuscript, we show evidence from muon pair production measurements that these distributions are significantly different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momentum. These results revive interest in several proposed mechanisms as the origin of this antimatter asymmetry in the proton that had been disfavored by the previous results and point to the future measurements that can distinguish between these mechanisms.
Evidence for a flavor asymmetry between the \(\bar u\) and \(\bar d\) quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced ...dependence of this flavor asymmetry on \(x\) (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the \(\bar d\left(x\right) / \bar u\left(x\right)\) ratio in the \(x > 0.15\) region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for \(\bar d\left(x\right) / \bar u\left(x\right)\) in the large \(x\) region up to \(x=0.45\) using the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios, \(\sigma^{pd} /2 \sigma^{pp}\), from the SeaQuest data give consistent results. The \(\bar{d}\left(x\right) / \bar{u}\left(x\right)\) ratios and the \(\bar d\left(x\right) - \bar u\left(x\right)\) differences are deduced from these cross section ratios for \(0.13 < x < 0.45\). The SeaQuest and E866/NuSea \(\bar{d}\left(x\right) / \bar{u}\left(x\right)\) ratios are in good agreement for the \(x\lesssim 0.25\) region. The new SeaQuest data, however, show that \(\bar d\left(x\right)\) continues to be greater than \(\bar u\left(x\right)\) up to the highest \(x\) value (\(x = 0.45\)). The new results on \(\bar{d}\left(x\right) / \bar{u}\left(x\right)\) and \(\bar{d}\left(x\right) - \bar{u}\left(x\right)\) are compared with various parton distribution functions and theoretical calculations.
`I would encourage undergraduates students to read it, for it does summarise well a classical Marxist analysis of social policy and welfare′ - Social Policy he anti-capitalist movement is ...increasingly challenging the global hegemony of neo-liberalism. The arguments against the neo-liberal agenda are clearly articulated in Rethinking Welfare. The authors highlight the growing inequalities and decimation of state welfare. Using Marxist approaches to contemporary social policy they provide a defence of the welfare state. They explore the question of globalization as well as the neo-liberal agenda of the Conservative and New Labour governments in Britain.
