We assessed methylmercury (MeHg) concentrations across multiple ecological scales in the Edisto (South Carolina) and Upper Hudson (New York) River basins. Out-of-channel wetland/floodplain environments were primary sources of filtered MeHg (F-MeHg) to the stream habitat in both systems. Shallow, open-water areas in both basins exhibited low F-MeHg concentrations and decreasing F-MeHg mass flux....

Recently, speech recognition systems based on articulatory features such as “voicing” or the position of lips and tongue have gained interest, because they promise advantages with respect to robustness and permit new adaptation methods to compensate for channel, noise, and speaker variability. These approaches are also interesting from a general point of view, because their models use phonologi...

In this paper we report the results of a pilot project we conduct to develop a semi-automated approach for tidal stream network extraction from remote sensor data. Our test site is part of the North Inlet-Winyah Bay National Estuarine Research Reserve in Georgetown, South Carolina, U.S.A. Largely lower than 1m above sea level, the study site consists of salt marshes behind barrier islands with ...

Web-spinning spiders that inhabit stream channels are considered specialists of aquatic ecosystems and are major consumers of emerging aquatic insects, while other spider taxa are more commonly found in riparian forests and as a result may consume more terrestrial insects. To determine if there was a difference in spider taxa abundance between riverine web-spinning spider assemblages within the...

Recently, speech recognition systems based on articulatory features such as “voicing” or the position of lips and tongue have gained interest, because they promise advantages with respect to robustness and permit new adaptation methods to compensate for channel, noise, and speaker variability. These approaches are also interesting from a general point of view, because their models use phonologi...

Communication from a low-to a high-level system without acknowledgements will be unreliable; with acknowledgements, it can be insecure. We propose to provide quantiiable security, acceptable reliability, and minimal performance penalties by interposing a device (called the Pump) to push messages to the high system and provide a controlled stream of acknowledgements to the low system. This paper...

Jumping LFSRs have recently been proposed [SASC04] as building blocks for stream ciphers. In this paper a construction based on these principles is described. The proposed encryption primitive is the key stream generator part of a synchronous stream cipher accommodating a key of 128 bits and an IV of 64 up till 112 bits. A number of cryptanalytic attacks are considered, leading to the conclusio...

On the basis of stream power, the phenomena including regime channel establishment and river meandering can be studied. So, previous researchers have suggested and developed the stream power theory and believed that stream power minimization affects these phenomena. In this paper, the stream power theory and a criterion for meandering river modeling will be studied. Then the conclusion of case ...

Introduction: Ever since the first recognition of channels on Mars, attempts to estimate the flow characteristics of channel systems and their sediment transport consequences have been a holy grail of martian hydrological and sedimentological studies [1-4]. Previous attempts were severely hampered by the lack of sufficiently precise data to perform the necessary calculations. The MOLA data set ...

In the analysis of streamflow depletion, the Hunt (1999) solution has an important advantage because it considers a partially penetrating stream. By extending the Hunt drawdown solution, this paper presents semianalytical solutions for gaining streams that evaluate the induced stream infiltration and base flow reduction separately. Simulation results show that for a given deltah (the initial hy...