In ring theory, the notion of annihilator is an important tool for studying the structures. Many characterizations and structure theorems can be derived by using this notion. On the other hand, certain classes of rings (e.g., Baer rings and Rickart rings) are defined by considering annihilators ideals. In the present work, we introduce a class of rings which is close to the class of Rickart rin...

While environmental pollution is becoming more and more serious, many countries are adopting policies to control pollution. At the same time, the environmental regulation will inevitably affect economic and social development, especially employment growth. The environmental regulation will not only affect the scale of employment directly, but it will also have indirect effects by stimulating up...

Background in music performance research For the past few decades there has been considerable scientific interest in expression in music performance (Gabrielsson, 2003). A particularly relevant aspect of music performance is expressive timing, that is, the fluctuations of tempo during a performance. Accordingly, expressive timing has been one of the major topics in music performance research. A...

Browne, Lockhart Clarke, Kesteven, Moxon, &c., the journal cannot fail to secure the support of the profession. With the exception of one or two articles, those which have already appeared are of an essentially practical and valuable character. We are sorry to find that Dr. Bucknill, in his review of Dr. Bateman's " Darwinism tested by Language," in the first number of Brain, has allowed his od...

Let T be an almost strongly minimal theory. Work inside a monster model M of T . Let M be a model (a small elementary substructure of M). If G is an M -definable group, and H is an M -definable subgroup, we can consider the homogeneous space G/H with the left-action by G. We will define “etale cohomology groups” H M(G/H,A) for all n ≥ 0 and all abelian groups A. We would like the following thin...

RADIATION: RECENT RESULTS FROM THE E-203 COLLABORATION∗ N. Delerue† , J. Barros, S. Le Corre, M. Vieille Grosjean, LAL, Orsay, France F. Bakkali Taheri, R. Bartolini, G. Doucas, I.V. Konoplev, C. Perry, A. Reichold, S. Stevenson, JAI, Oxford, UK N. Fuster Martinez, IFIC, Valencia, Spain H. Andrews, LANL, Los Alamos, New Mexico, U.S.A. V. Bharadwaj, C. Clarke, SLAC, Menlo Park, California, U.S.A...

Leon J. Osterweil, University of Massachusetts Amherst Matt Bishop, University of California at Davis Heather M. Conboy, University of Massachusetts Amherst Huong Phan, University of Massachusetts Amherst Borislava I. Simidchieva, University of Massachusetts Amherst and Raytheon BBN Technologies George S. Avrunin, University of Massachusetts Amherst Lori A. Clarke, University of Massachusetts A...

This study develops a methodology of inference for a widely used Cliff-Ord type spatial model containing spatial lags in the dependent variable, exogenous variables, and the disturbance terms, while allowing for unknown heteroskedasticity in the innovations. We first generalize the GMM estimator suggested in Kelejian and Prucha (1998,1999) for the spatial autoregressive parameter in the disturb...

In abstract elementary classes limit models are sometimes the appropriate substitute for saturated models. For Galois-stable abstract elementary classes which satisfy the amalgamation property, we prove under the assumption that there is a mildly behaved dependence relation, that for any model M , any two limit models over M of the same cardinality are isomorphic. This is useful in dealing with...