This paper is an overall review of studied carried out by the authors and some of their colleagues on RF breakdown, Field Emirrion and RF processing in room temperature electron linac structures. The motivation behind this work is twofold: in a fundamental way, to contribute to the understanding of the RF breakdown phenomenon, and as an application, to determine the maximum electric field gradi...

In this paper, we use five decades of time-use surveys to document trends in the allocation of time. We find that a dramatic increase in leisure time lies behind the relatively stable number of market hours worked (per working-age adult) between 1965 and 2003. Specifically, we show that leisure for men increased by 6‒8 hours per week (driven by a decline in market work hours) and for women by 4...

In this paper we will study the structure of algebras A(Γ) associated to two directed, layered graphs Γ. These are algebras associated with Hasse graphs of n-gons and the algebras Qn related to pseudoroots of noncommutative polynomials. We will find the filtration preserving automorphism group of these algebras and then we will find the multiplicities of the irreducible representations of Aut(A...

A snow-covered forest mapping method for optical remote sensing is proposed. The method is based on linear sub-pixel reflectance modelling of the surface components snow, individual tree species and bare ground. Experiments are performed using a 100% snow-covered Landsat TM scene and aerial photos covering spruce, pine and birch forest in the Jotunheimen mountain area of South Norway. The refle...