The sources of the theories underlying Czech Cubist architecture before World War I have been only sketchily studied to date. To analyze these theories and identify their sources, I focus on the work of architect and theorist Pavel Janak (1882-1956),…

The work of Jean Cocteau (1889-1963), the poet, while extremely diverse, presents nonetheless a coherence and a unity of tone which transmit his artistic vision and at the same time reveal his creative process., Three works in particular, Opium--Journal d'une…

This paper reports nonparametric estimates of the effect of labor supply
behavior on the payments to families enrolled in the Seattle/Denver Income
Maintenance Experiment. The randomized assignment of families to the
treatment groups in this experiment was designed to permit…

If hours can be freely varied within jobs, the effect on hours of
changes in preferences for those who do change jobs should be similar to
the effect on hours for those who do not change jobs. Conversely, if
employers…

This paper presents evidence showing that individuals’ season of birth is
related to their educational attainment because of the combined effects of
school start age policy and compulsory school attendance laws. In most school
districts, individuals born in the beginning…

The US unemployment insurance system is financed by an experience-rated
payroll tax. The system imposes a layoff or firing cost on employers, leading
them to fire fewer workers in a downturn and hire fewer workers in an upturn.
Increases in…

Between 1960 and 1980 the gap in earnings between black and white
males narrowed by 15 percent. A detailed analysis of 1960, 1970, and 1980
Census data indicates that increases in the relative return to education
were largely responsible for…

This paper estimates the effects of school quality -- measured by the
pupil-teacher ratio, the average term length, and the relative pay of
teachers -- on the rate of return to education for men born between 1920 and
1949. Using…

This paper tests the hypothesis that compulsory school attendance
laws, which typically require school attendance until a specified birthday,
induce a relationship between years of schooling and age at school entry.
Variation in school start age created by children's date…

Luminosity profiles and the evolution of shock waves in general-relativistic radiating spheres


(Herrera, L.; Núñez, Luis)


Abstract


A method recently proposed by the authors to study the evolution of discontinuities in radiating spherically symmetric…