Search for New Particles Decaying to b bbar in p pbar Collisions at sqrt{s}=1.8 TeV

We have used 87 pb^-1 of data collected with the Collider Detector at Fermilab to search for new particles decaying to b bbar. We present model-independent upper limits on the cross section for narrow resonances which excludes the color-octet technirho in the mass interval 350 < M < 440 GeV/c^2. In addition, we exclude topgluons, predicted in models of topcolor-assisted technicolor, of width Gamma = 0.3 M in the mass range 280 < M < 670 GeV/c^2, of width Gamma = 0.5 M in the mass range 340 < M < 640 GeV/c^2, and of width Gamma = 0.7 M in the mass range 375 < M < 560 GeV/c^2.Comment: 17 pages in a LaTex generated postscript file, with one table and four figures. Resubmitted to Physical Review Letters. Minor clarifications were added to the text. The displayed normalization of the resonance models in Figure 2 was modified to correspond to our 95% CL upper limit on the cross section (instead of arbitrary normalization which was used previously). All results are identical to those in the previous submissio

ANALYSIS OF LEAD IN SOILS ADJACENT TO INTERSTATE 275 IN TAMPA, FLORIDA

Analysis of two hundred and twenty-four soil samples collected at logarithmic intervals on perpendicular transects adjacent to Interstate Highway 275 in Tampa, Florida revealed that thirty-five percent of the samples contained health-threatening levels of lead (greater than 500 ppm), although the pattern of contamination was not predictable. Twenty-two of the thirty-two transect locations extended toward residential areas and, of these, twenty contained soil lead values dangerous to humans. This analysis also revealed that soil lead does not decrease logarithmically with distance from the highway, as shown in other studies. Soil lead at 3, 9, 27, 81, 243, 729, and 2187 cm distances averaged 316, 305, 303, 403, 444, 295, and 212 ppm respectively

An Experimental Study of the Utility of Adventitious Roots for Determining the Hydroperiod in Isolated Wetlands

Accurate measurement of the hydroperiod in isolated wetlands currently relies upon the installation and frequent monitoring of devices such as piezometers and staff gauges. Observations of biological indicators of the hydroperiod can provide supplemental data to these devices and potentially replace them as a means of accurately determining this hydrologic interval. In this preliminary study, our objective is to determine whether adventitious root formation and maturation on buttonbush (Cephalanthus occidentalis) is a viable indicator of the hydroperiod in isolated wetlands. Buttonbush seedlings were flooded in a controlled environment over a three month period in the summer of 2011. During this time, the length and complexity of adventitious roots observed were recorded. We found a significant positive relationship between average lengths of primary adventitious roots and time of inundation. The sequential appearance of secondary, tertiary and quaternary roots also corresponded with the length of the hydroperiod. From these preliminary results, we see a strong potential of using adventitious roots on buttonbush to help determine the hydroperiods of isolated wetland systems. Ideally, future studies will extend the period of investigation beyond our three month interval and calibrate these findings with examples from natural wetlands

A High-Resolution Geological and Geophysical Investigation of the Dry Tortugas Carbonate Depositional Environment

Geophysical surveys and ground truth data are compared from a site in the Dry Tortugas, Florida. Seismic data reveal six depositional sequences bounded by high-amplitude reflectors interpreted as subaerial unconformities. Chirp sonar data reveal structure within the Holocene depositional sequence that is correlated to ground truth data. Sedimentary units within the Holocene sequence record a transition from a low-energy, lagoonal environment, to a high-energy, shallow marine environment, to a moderate-energy, slightly deeper marine environment. Forward modeling and impedance inversion reveal good agreement between sediment physical properties, acoustic properties measured by the electric logger, and the chirp sonar data