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

Building Sustainable Success in Art Galleries: An Exploratory Study of Adaptive Strategies

Historically, art galleries have operated in a cottage industry that placed a premium on building unique relations with artists and clients. Recent economic and technological trends threaten the viability of this model. Art galleries now face a very challenging environment, demanding careful attention to strategy formulation and execution. However, more questions than answers can be found in the literature about management practices, art gallery performance, and factors affecting gallery success. This paper reports findings on these issues from an exploratory survey of Colorado art galleries. Results suggest that art gallery owners and mangers are not overly concerned about external pressures influencing their organizations. This attitude could adversely affect efforts to build sustainable success and value through adaptive strategies