We are grateful to Martin N. Baily, Ernst Berndt, Bronwyn Hall, Christopher Jencks, seminar participants at Duke, the University of Michigan, Princeton University, the European University Institute, and to participants in the CRIW meeting on "Hard-to-Measure Goods and Services: Essays in Memory of Zvi Griliches" in September 2003. Weiping Zhou and Daniel Gottlieb provided superb data analysis. ...

Recently, there has been increasing interest in utilizing solar thermophotovoltaics (STPV) to convert sunlight into electricity, given their potential to exceed the Shockley–Queisser limit. Encouragingly, there have also been several recent demonstrations of improved systemlevel efficiency as high as 6.2%. In this work, we review prior work in the field, with particular emphasis on the role of ...

We introduce and study a new class of generalized inverses in rings. An element ring R has Zhou inverse if there exists b∈R such that bab=b,b∈comm2(a),an−ab∈J(R) for some n∈N. We...

In this paper, we present an integrated version of the Ng model and Zhou and Fan model [W. L. Ng,A simple classifier for multiple criteria ABC analysis, European Journal of Operation Research, 177(2007) 344-353; P. Zhou & L. Fan, A note on multi-criteria ABC inventory classification usingweighted linear optimization, European Journal of Operation Research, 182 (2007) 1488-1491]. Themodel that N...