A Scalable Packet Sorting Circuit for High-Speed WFQ Packet Scheduling

A novel implementation of a tag sorting circuit for a weighted fair queueing (WFQ) enabled Internet protocol (IP) packet scheduler is presented. The design consists of a search tree, matching circuitry, and a custom memory layout. It is implemented using 130-nm silicon technology and supports quality of service (QoS) on networks at line speeds of 40 Gb/s, enabling next generation IP services to be deployed.     

Executive cognitive function and heavy drinking behavior among college students.

Executive cognitive functions (ECFs) seem important for motivating change and self-regulation of problem drinking. Evidence for executive cognitive deficits have been found among heavy-drinking college students. Although college students who abuse alcohol often experience a variety of negative consequences related to their drinking behavior, executive cognitive dysfunction may interfere with recognizing consequences and responding skillfully to avoid future harm. Fifty college students with drinking problems completed assessments of ECFs. Greater negative drinking consequences and short-term memory function significantly predicted greater awareness of drinking problems. ECF may be an important factor for motivation to change drinking behavior among college students. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

12W high-brightness single-frequency DBR tapered diode laser

A distributed Bragg reflector (DBR) tapered diode laser with a record optical output power of 12 W and a conversion efficiency of about 44% is presented. The device has a sixth-order surface grating and shows single longitudinal mode emission at 979 nm as well as a nearly diffraction limited beam. At 11.4 W the laser has a lateral beam propagation factor of M ² _1/ e ²=1.1 with 72% of the power in the central lobe.     

Sphärische Multipolanalyse der Beugung elektromagnetischer Wellen an einer ideal leitenden elliptisch berandeten Kugelschale

Übersicht In dieser Arbeit wird die sphärische Multipolanalyse zur Berechnung der Beugung an einer elliptisch berandeten Kugelschale herangezogen. Dieses Randwertproblem mit Laméschen Differentialgleichungen. Die numerische Auswertung umfaßt einerseits die Berechnung von Stromverläufen und Richtcharakteristiken für den dipolerregten elliptisch konturierten Kugelflächenreflektor. Andererseits werden charakteristische Streuparameter für eine Hohlkugel mit elliptischer Apertur berechnet. Die dabei benötigte Multipolentwicklung der ebenen Welle in elliptischen Kegelkoordinaten wird angegeben.

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Diffraetion of electromagnetic waves by a perfectly conducting spherical shell with elliptical contour a spherical multipole analysis

Contents In this paper the spherical multipole analysis is used in order to treat the diffraction by a spherical shell with elliptical contour. This boundary value problem can be reduced to a two-parametric eigenvalue problem with two Lamé equations. Numerical data are presented like current distributions and radiation patterns for a spherical reflector with elliptical contour. Furthermore computed scattering characteristics for a spherical cavity with an elliptical aperture are shown.

     

Automated streamflow measurements in high-elevation Alpine catchments

Salt dilution is a well-established streamflow measurement method in creeks, which works particularly well downstream of turbulent flow sections as the mixing of the salt tracer is enhanced. Usually, salt dilution measurements are performed manually, which considerably limits the observations of rare peak flow events. These events are particularly important for constructing robust rating curves and avoiding large uncertainties in the extrapolation of streamflow values. An additional challenge is the variability of the river cross section, especially after larger discharge events, leading to nonstationary rating curves. Therefore, discharge measurements well distributed over time are needed to construct a reliable streamflow–water level relationship and to detect changes caused by erosion and deposition processes. To overcome these two issues, we used an automated streamflow measuring systems at three different sites with contrasting hydrological and hydraulic characteristics in the Alps. This system allowed us to measure discharge at nearly maximum flow of the observation period (2020–2021) at all three sites and to detect abrupt changes in the rating curve by performing event-based salt injections. The uncertainty in the measurements was quantified, and the streamflow was compared with official gauging stations in the same catchment. Based on a very large dataset of almost 300 measurements, we were able to evaluate the reliability of the system and identify the primary sources of uncertainty in the experimental setup. One key aspect was the site selection for the downstream electrical conductivity sensors, as measurement location strongly controls the signal-to-noise ratio in the recorded breakthrough curves.