Books Received

We investigate the persistence of spectral gaps of one-dimensional frustration free quantum lattice systems under weak perturbations and with open boundary conditions. Assuming that the interactions of the system satisfy a form of local topological quantum order, we prove explicit lower bounds on the ground state spectral gap and higher gaps for spin and fermion chains. By adapting previous methods using the spectral flow, we analyze the bulk and edge dependence of lower bounds on spectral gaps

AGRICULTURAL PROGRAMS FOR HIGH-RISK AREAS OF THE SOUTHERN GREAT PLAINS

Agricultural and Food Policy,

What has become of the "stability-through-inflation" argument?

In this article, James B. Bullard and Alvin L. Marty begin by summarizing some popular arguments for positive steady-state rates of inflation based on the idea that a certain amount of inflation stabilizes economic performance. Then, synthesizing a number of disparate results in a single framework and using a general class of money-demand functions, they find that the stability-through-inflation arguments have either been completely replaced (by potent but unsettling results based on rational expectations) or called into question (by more sophisticated treatments of the adaptive expectations hypothesis).Inflation (Finance)

Check Swine Brucellosis

Three plans have been worked out for testing and segregating the breeding herds to control this costly and dangerous disease found on Iowa farms

Criteria for Evaluation of a Swine Brucellosis Program

The veterinarian holds a unique responsibility because of his position as the guardian of the livestock industry. The profession has an enviable record of successful disease control programs, bovine tuberculosis and Texas fever being those best known. In order to better assume leadership in the evaluation of specific programs it is important to realize that these disease control programs have developed in a logical pattern