Metal-Insulator transition in the Generalized Hubbard model

We present the exact ground-state wave function and energy of the generalized Hubbard model, subjected to the condition that the number of double occupied sites is conserved, for a wide, physically relevant range of parameters. For one hole and one double occupied site the existence of the ferromagnetic ground-state is proved which allow one to determine the critical value of the on-site repulsion corresponding to the point of metal-insulator transition. For the one dimensional model the exact solution for special values of the parameters is obtained.Comment: 20 pages, LaTex. Mod.Phys.Lett.B 7 (1993) 1397; Journal of Physics: Condensed Matter (to appear

Potential Impacts of Free Trade Areas and Common Currency on Sustainable Agricultural Export in Africa

Peer reviewedPublisher PD

Comment letters to the National Commission on Commission on Fraudulent Financial Reporting, 1987 (Treadway Commission) Vol. 1

https://egrove.olemiss.edu/aicpa_sop/1661/thumbnail.jp

A Step Toward the Assessment of English as a Lingua Franca

This conceptual paper describes the need for L2 English tests to consider English as a lingua franca (ELF) in their development. After discussing what is meant by ELF, it describes an oral communication placement test developed at a large Midwestern university in the United States. The test is then analyzed based on a framework designed to determine the extent to which a test can be considered to have adhered to ELF principles. It is argued that for the most part the test does appear to assess ELF. However, it does not completely adhere to ELF principles, and sometimes, because there is little agreement on ELF principles, it is difficult to determine the extent to which the test actually does assess ELF. It is recommended that researchers in the field come to agreement on what can be considered critical aspects of ELF, which will make it possible for language assessment researchers to better design their assessments to include ELF.This accepted book chapter is published as Ockey, G. J., & Hirch, R. (2020). A step toward the assessment of English as a second language. In G., Ockey & B. Green (Eds.), Another generation of fundamental considerations in language assessment: A festshrift in honor of Lyle F. Bachman. Springer. Doi: 10.1007/978-981-15-8952-2. Posted with permission. </p