The status of the mussel community of Ohio Brush Creek and its tributaries in southeastern Ohio was evaluated over a 17-year period. Species richness increased from 16 and 20 species found in 1996 and 1987, respectively, to 23 found in 2004. Despite the increase in species richness, the abundance of live and freshly dead shells declined, particularly for common species. Community structure chan...

background and purpose: emergency physicians play an important role in the immediate diagnosis of bioterrorism activities. the present study was conducted with the purpose of comparing the effectiveness of virtual learning and classroom learning in approach to bioterrorism and chemical terrorism for emergency physician s. methods: this was a semi-empirical study, which was conducted via testing...

In this project, a design for a non-invasive, EEG-based braincontrolled wheelchair has been developed for use by completely paralyzed patients. The proposed design includes a novel approach for selecting optimal electrode positions, a series of signal processing algorithms and an interface to a powered wheelchair. In addition, a 3D virtual environment has been implemented for training, evaluati...

The aim of this article is to provide a complete analysis of the behavior of a noncontact atomic force microscope ~NC-AFM!. We start with a review of the equations of motion of a tip interacting with a surface in which the stability conditions are first revisited for tapping mode. Adding the equations of automatic gain control ~AGC!, which insures constant amplitude of the oscillations in the N...

Conventional software radios take advantage of vastly improved analog to digital converters (ADC’s) and digital signal processing (DSP) hardware. Our approach, which we refer to as virtual radios, also depends upon high performance ADC’s. However, rather than use DSP’s, we have chosen to ride the curve of rapidly improving workstation hardware. We use wideband digitization and then perform all ...

Historically, at least 3 methodological problems have dogged experimental social psychology: the experimental control–mundane realism trade-off, lack of replication, and unrepresentative sampling. We argue that immersive virtual environment technology (IVET) can help ameliorate, if not solve, these methodological problems and, thus, holds promise as a new social psychological research tool. In ...

1 Signal Processing Institute (ITS), School of Engineering (STI), Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland, {iva.bogdanova; pierre.vandergheynst; murat.kunt}@epfl.ch Abstract – The specific issue addressed in this paper is tailoring specific functionality to allow a group of teachers and students to carry out the learning process in Digital Signal and Image Pr...

Repetitive control (RC) scheme presents an attractive solution to achieve excellent steady-state tracking error and low total harmonic distortion (THD) for periodic signals. RC can produce extremely large gains at fundamental and each harmonic frequency of reference signal to achieve all harmonics suppression. However, a DC-AC inverter always has uneven THD distribution, e.g. THD concentrates a...

This article aims to redefine the concept of Thirdspace and make a trilateral relationship between the three concepts of real space, virtual space and the user. To do so, not only the concept of Thirdspace has to be redefined, but also a new understanding of virtual space as a relatively independent space is required. This three-sided relation requires a new understanding of the relationship be...