Experimental and Numerical-Modeling Studies of a Field-Scale Hazardous Waste Rotary Kiln Incinerator.

A comprehensive study of rotary kiln incineration is ongoing at Louisiana State University. Through experimentation at all levels and numerical modeling, the underlying physical processes are searched out and studied with the intent to improve the understanding of how rotary kiln incinerators process waste with the eventual goal of creating a fully predictive numerical model. The experimental work presented here focuses on mapping combustion gas temperature and, for the first time, velocity fields of a field-scale, industrial incinerator. Measurements are made at multiple points across an upper quadrant of the kiln near its exit using a bidirectional pressure probe, suction pyrometer, and a newly designed, lighter yet stiffer, positioning boom. The kiln is directly fired using natural gas in a steady state mode without waste processing. Results indicate insignificant horizontal variation, but strong vertical stratification, with the highest values of temperature and velocity corresponding to the top of the kiln. Access restraints prevented the lower region from being mapped. Operating conditions were varied by adjusting the amount of ambient air added to the front of the kiln. Increasing this air flow reduced temperatures as expected, but did not have as significant an effect on velocities. The quality of the results is examined by performing mass balances and by comparing with an existing numerical model. Both methods indicate that the experimental results are reasonable. A new steady state numerical model for the rotary kiln segment of this incinerator is then presented. This model builds on previous LSU work by including radiation and soot in the heat transfer analysis, switching to an adiabatic kiln wall boundary condition, and including a more accurate geometry and better fitting grid. These changes improve agreement with data taken from this rotary kiln by up to two orders of magnitude compared with previously developed models at LSU. In most instances, prediction is within repeatability limits of the experiments. Grid dependency is demonstrated near the kiln front where gradients are very steep. Near the exit, however, where experimental data are available, both grids produce very similar results. Parametric and sensitivity studies using the developed model are reported

Retinofugal projections in the lepidosirenid lungfishes

Autoradiographic and silver methods indicate that the African and South American lungfishes, Protopterus and Lepidosiren , lack ipsilateral retinal projections. Contralaterally, the retina projects to the preoptic nucleus of the hypothalamus, to four discrete areas located in the lateral neuropil of the thalamus, to a superficial pretectal neuropil, to the upper half of the tectal neuropil, and to a laterally situated basal optic neuropil located in the rostral tegmentum. The overall pattern of the primary retinofugal projections is markedly similar to that of amphibians which suggests that lungfishes may be more closely related to amphibians than to actinopterygian fishes. Neotenic trends in both lepidosirenid lungfishes and urodeles may be expressions of parallelism, hence Latimeria and Neoceratodus must be examined to resolve this phylogenetic problem. A 300-fold range in the size of the eye, indicated by the number of ganglion cells present, occurs among lungfishes, salamanders and frogs. This variation may have implications for recognizing the morphological expression of selection operating on the visual systems of lepidosirenids and amphibians.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/50000/1/901740402_ftp.pd

THE PLEISTOCENE FAUNAL ASSEMBLAGES OF THE MIDDLE LOUP RIVER TERRACE-FILLSOF NEBRASKA.

Abstract not availabl

Vocabulario Huambisa

El Huambisa pertenece a la familia jíbaro. Su vocabulario es muy extenso y su gramática muy compleja. La lista de unas 3,000 que se presentan en este volumen no pretende ser completa. Contiene, mayormente, las palabras de los dialectos regionales

THE PLEISTOCENE FAUNAL ASSEMBLAGES OF THE MIDDLE LOUP RIVER TERRACE-FILLSOF NEBRASKA.

Abstract not availabl

Diccionario Aguaruna

Este volumen se elaboró con el propósito de proveer una fuente de información bilingüe que sirviera tanto la los hablantes del aguaruna para que valoren más su lengua y su cultura como a los hispano-hablantes que tuvieran interés en conocer este idioma