University of Houston

About: University of Houston is a education organization based out in Houston, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 23074 authors who have published 53903 publications receiving 1641968 citations.

Decline of Male Labor Market Participation: The Role of Declining Market Opportunities

Abstract: This paper uses micro data from the Current Population Surveys to document the secular decline in labor market activity among prime age men from 1967 to 1987. Declines in employment occur at all ages but are found to be particularly severe among less-educated and low-wage men. Information on the cross-section wage-employment relationship and on actual wage changes indicates that the initial fall in employment from the late 1960s to the early 1970s is entirely attributable to falling labor supply whereas since the early 1970s, wage changes predict most of the decline in employment for whites and approximately half of the decline for blacks.

Vascular endothelial morphology as an indicator of the pattern of blood flow.

Abstract: A quantitative study of the en face size and shape of endothelial cells from aortic intercostal ostia has been carried out in rabbits. Photomicrographs were taken from vascular casts of the rabbit aorta and the endothelial cell outlines were analyzed quantitatively using a digitizer and digital computer. The morphology of the endothelial cells was described using 8 calculated parameters (area, perimeter, length, width, angle of orientation, width: length ratio, axis-intersection ratio and shape index). Marked changes in cell morphology were found in the regions proximal and distal to ostia as well as around flow dividers. Cells on the aorta are aligned with the flow direction, and the endothelial cells within the ostia have an angle of orientation of approximately 45 deg to the axis of the vessel. The results obtained to date suggest that endothelial cell morphology and orientation around a branch vessel may be a natural marker or indicator of the detailed features of blood flow.

The Changing Environment of Selling and Sales Management

Abstract: New developments and trends in selling and sales management are creating demands and opportunities that require adaptation and new approaches on the part of both sales organizations and academic researchers. This paper summarizes critical dimensions of change in the environment that affect the practice of selling and sales management and introduces the papers that follow in this Anniversary Special Issue of JPSSM.

3D volumetric multispectral estimates of reflector curvature and rotation

Abstract: One of the most accepted geologic models is the relation between reflector curvature and the presence of open and closed fractures. Such fractures, as well as other small discontinuities, are relatively small and below the imaging rangeofconventionalseismicdata.Dependingonthetectonic regime, structural geologists link open fractures to either Gaussian curvature or to curvature in the dip or strike directions. Reflector curvature is fractal in nature, with different tectonic and lithologic effects being illuminated at the 50-m and1000-m scales.Untilnow,suchcurvatureestimateshave been limited to the analysis of picked horizons. We have developed what we feel to be the first volumetric spectral estimates of reflector curvature. We find that the most positive and negative curvatures are the most valuable in the conventional mapping of lineations — including faults, folds, and flexures.Curvatureismathematicallyindependentof,andinterpretatively complementary to, the well-established coherence geometric attribute. We find the long spectral wavelengthcurvatureestimatestobeofparticularvalueinextracting subtle, broad features in the seismic data such as folds, flexures, collapse features, fault drags, and under- and overmigrated fault terminations. We illustrate the value of these spectral curvature estimates and compare them to other attributes through application to two land data sets — a salt domefromtheonshoreLouisianaGulfCoastandafractured/ karsteddatavolumefromFortWorthbasinofNorthTexas.