Lattice gas models derived from effective field theory

We start from a low-energy effective field theory for interacting fermions on the lattice and expand in the hopping parameter to derive the nearest-neighbor interactions for a lattice gas model. In this model the renormalization of couplings for different lattice spacings is inherited from the effective field theory, systematic errors can be estimated a priori, and the breakdown of the lattice gas model description at low temperatures can be understood quantitatively. We apply the lattice gas method to neutron matter and compare with results from a recent quantum simulation.Comment: 13 pages, 4 figure

Sustainable Leadership: Creating Foundations for Lasting Change

The change in the United States population and the pace of Internet technology-perhaps more dramatic than most universities may have forecasted-translates into more diverse prospective students with changing needs and interests in university education (Wilson & Meyer, 2009). Immigration and U.S. population growth patterns have converged into a new prospective student profile (Banks, 2008), such that between now and the year 2050, one in three U.S. residents will be Hispanic (U.S. Census, 2009). Similarly, African Americans and Black immigrants will increase to 15% of the U.S. population, and the Asian population will grow from 5.1% to 9.2%. People of two or more cultures will more than triple between now and the year 2050, and minority children will constitute 62% of U.S. children, up from 44% today. The new challenge of recruiting new techno-savvy diverse prospective students is impacting many dimensions of higher education, particularly the historic euro-centric focus (Eckel & King, 2009)

Personhood, harm and interest: A reply to Alberto Giubilini and Francesca Minerva

In the article ‘After-birth abortion: why should the baby live?’ arguments are made in favour of the moral permissibility of intentionally killing newborn infants, under particular conditions. Here we argue that their arguments are based on an indefensible view of personhood, and we question the logic of harm and interest that informs their arguments. Furthermore, we argue that the conclusions here are so contrary to ordinary moral intuitions that the argument and conclusions based upon it—including those which defend more mainstream methods of abortion—should be treated with immediate suspicion

Modeling Technical Change in Midwest Corn Yields, 1895-2005: A Time Varying-Regression Approach

This paper explores the use of time-varying regression models to model the effects of technical change in US Midwest Corn yields. The data extends from 1895 to 2005 encompassing the implementation of hybrid technologies and improvements in farm production practices.time-vary regression model, modeling technical change, corn yield technical change, Crop Production/Industries,

THE FINANCIAL EFFECTS OF ECR

Agribusiness,

The separate neural control of hand movements and contact forces

To manipulate an object, we must simultaneously control the contact forces exerted on the object and the movements of our hand. Two alternative views for manipulation have been proposed: one in which motions and contact forces are represented and controlled by separate neural processes, and one in which motions and forces are controlled jointly, by a single process. To evaluate these alternatives, we designed three tasks in which subjects maintained a specified contact force while their hand was moved by a robotic manipulandum. The prescribed contact force and hand motions were selected in each task to induce the subject to attain one of three goals: (1) exerting a regulated contact force, (2) tracking the motion of the manipulandum, and (3) attaining both force and motion goals concurrently. By comparing subjects' performances in these three tasks, we found that behavior was captured by the summed actions of two independent control systems: one applying the desired force, and the other guiding the hand along the predicted path of the manipulandum. Furthermore, the application of transcranial magnetic stimulation impulses to the posterior parietal cortex selectively disrupted the control of motion but did not affect the regulation of static contact force. Together, these findings are consistent with the view that manipulation of objects is performed by independent brain control of hand motions and interaction forces