Endemic Flora and Fauna of Arkansas

Arkansas has an amazing diversity of plants and animals contained within its political boundaries. Forty-seven taxa are reported as Arkansas endemics, including seven plants, thirteen crustaceans (two amphipods, three isopods, eight crayfishes), nine insects (one mayfly, one caddisfly, three stoneflies, four beetles), ten snails, six fishes, and two salamanders

Sinc-Galerkin estimation of diffusivity in parabolic problems

A fully Sinc-Galerkin method for the numerical recovery of spatially varying diffusion coefficients in linear partial differential equations is presented. Because the parameter recovery problems are inherently ill-posed, an output error criterion in conjunction with Tikhonov regularization is used to formulate them as infinite-dimensional minimization problems. The forward problems are discretized with a sinc basis in both the spatial and temporal domains thus yielding an approximate solution which displays an exponential convergence rate and is valid on the infinite time interval. The minimization problems are then solved via a quasi-Newton/trust region algorithm. The L-curve technique for determining an approximate value of the regularization parameter is briefly discussed, and numerical examples are given which show the applicability of the method both for problems with noise-free data as well as for those whose data contains white noise

Wind tunnel balance

A flow-through balance is provided which includes a non-metric portion and a metric portion which form a fluid-conducting passage in fluid communication with an internal bore in the sting. The non-metric and metric portions of the balance are integrally connected together by a plurality of flexure beams such that the non-metric portion, the metric portion and the flexure beams form a one-piece construction which eliminates mechanical hysteresis between the non-metric and the metric portion. The system includes structures for preventing the effects of temperature, pressure and pressurized fluid from producing asymmetric loads on the flexure beams. A temperature sensor and a pressure sensor are located within the fluid-conducting passage of the balance. The system includes a longitudinal bellows member connected at two ends to one of the non-metric portion and the metric portion and at an intermediate portion thereof to the other of (1) and (2). A plurality of strain gages are mounted on the flexure beams to measure strain forces on the flexure beams. The flexure beams are disposed so as to enable symmetric forces on the flexure beams to cancel out so that only asymmetric forces are measured as deviations by the strain gages

Cave Fauna of Arkansas: Selected Invertebrate Taxa

This report is the first in a series of reports describing the fauna of Arkansas caves. Included are notes accumulated during the past four years on nematomorphs, amphipods, isopods, diplopods, decapods, and a variety of insect taxa. In addition to indicated records of distribution, the ecological status of each species (as a cavernicole) is described as troglobitic, troglophilic, trogloxenic, or accidental. Several of the included species are reported for the first time from Arkansas

Coastal ocean processes : wind-driven transport processes on the U.S. west coast : Portland, Oregon, Workshop July 14-16, 1993

Wind-driven transport occurs on nearly all of the world's continental shelves. A workshop, open to all interested scientists, was held in Portland, Oregon, on July 14-16, 1993, to assess the need for a major interdisciplinary study, and to begin defining the relevant questions and approaches. Specific questions were posed in the areas of air-sea feedback, sources and sinks of chemicals in the euphotic zone, plankton distributions and benthic exchanges. The consensus of the entire workshop was that a CoOP study of wind-drven transport processes should be made and should take place over the continental margin adjacent to the U.S. west coast. The central question to be addressed is: What processes control the cross-margin transport of biological, chemical and geological materials in a strongly wind-driven system? Some recommendations were made for locations and measurement techniques to be used in the envisioned two-year field program.Funding was provided by the National Science Foundation under Grant No. OCE92-24824

The Geology of the Davis Ranch Oil Pool, Wabaunsee County, Kansas

The discovery of the Davis Ranch oil pool in Wabaunsee County, Kansas, in April 1949 started one of the most important leasing and wildcat drilling programs in Kansas in recent years. In the 21 months since the completion of the discovery well, 65 holes have been drilled in Wabaunsee County alone. Of this total 38 may be classed as wildcat or semiwildcat wells, three of which have opened additional new pools. In view of the increased activity in Wabaunsee County and the Kansas part of the Forest City basin, a report showing our interpretations of the stratigraphy and structural relations of the Davis Ranch pool has been considered appropriate. All interpretations must be considered tentative until further information is received by the Survey. On February 1, 1951, the Davis Ranch pool had 18 producing oil wells. Six dry holes have been drilled and one oil well, the Aladdin and Bakke No. 1 Schutter in the SW SW SW sec. 34, T. 13 S., R. 10 E. was abandoned in December 1950. This well was the only producing well in the Davis Ranch East pool. The structure shown by the surface rocks is a north-northeast trending anticline with a closure of more than 20 feet. The Davis Ranch anticline is located on the northeast-trending subsurface Alma anticline which extends northward into Pottawatomie County and southward into Lyon County. The pre-Pennsylvanian structure is marked by a reverse fault which is not noticeable in the surface structure. Seventeen wells produce from the Viola dolomite and one well from the "Hunton" dolomite in the Davis Ranch pool. The thickness of the oil-saturated porous zone in the Viola ranges from a featheredge to 20 feet. Initial productivity tests indicated little or no water present in the producing zone