Application-Specific Instruction-Set Processor for Retinex-Like Image and Video Processing

This brief presents an application-specific instruction-set processor (ASIP) for real-time Retinex image and video filtering. Design optimizations are addressed at algorithmic and architectural levels, the latter including a dedicated memory structure, an adapted pipeline, bypasses, a custom address generator and special looping structures. Synthesized in CMOS technology, the ASIP stands for its better energy-flexibility tradeoff versus reference ASIC and digital signal processing Retinex implementations.     

Comparison of the efficacy of oxidative processes and flocculation for the removal of colour from Eop effluent.

Up to 30% of the released colour arising from bleached kraft pulp and paper production comes from the alkaline extraction stage. This waste stream can therefore be readily targeted to remove colour at source in mills where improved colour management is required. The efficacy of five advanced oxidative treatment and physico-chemical technologies in removing colour from a typical Eop stage effluent was compared. The most effective oxidative treatment was peroxymonosulphate (79% colour removal in 15 minutes). Ozone and TAML treatments removed 74% and 58% of colour respectively within 30 minutes. In comparison, hydrogen peroxide alone was only able to remove 35% of the colour over 4 hours. Coagulation with polyaluminium chloride achieved 89% colour removal within 5 minutes. However, this treatment produced an undesirable sludge, and may cause toxicity in the treated wastewater. Overall, colour removal ability of the five technologies ranked from highest to lowest was polyaluminium chloride > peroxymonosulfate > ozone > TAML > hydrogen peroxide. Other factors, such as operating costs, feedstock modification and capital infrastructure, also need to be taken into account when selecting the most suitable colour management option.     

Evaluating the solar resource: a review of problems resulting from temporal, spatial and angular variations

Accurate assessment of the availability of solar energy at the Earth's surface is hampered by difficulties associated with the variability of solar radiation in space and time and with the angular position in the sky hemisphere. This paper assesses each of these problem areas by highlighting the difficulties and the attempts to offset them. Major emphasis is placed on extrapolation and interpolation procedures, the sensitivity of inclined surfaces to variations in the solar input, numerical models for calculating the irradiance of inclined surfaces and the time scales for which these computations are valid.Finally, the reader is urged to consider the significance of these difficulties in light of both radiation measurement errors and the sensitivity of the application to imprecise determinations of the radiation environment.     

Verbindungstechniken mit hoher leistungsfähigkeit—Stand und entwicklung

Zusammenfassung Generell stellen die Verbindungsbereiche Schwachstellen dar. Zwar k?nnen in gewissen F?llen derartige Schwachstellen umgangen werden. im Vordergrund steht jedoch eine gesicherte Erh?hung der Leistung bekannter Verbindungsarten. Voraussetzung hierfür sind auf die jeweilige Verbindung (und Holzart) ausgerichtete konstruktive L?sungen. H?ufig lassen sich derartige Entwicklungen nicht oder nur unvollst?ndig durch bereits normierte Regeln der Baukunde abdecken. In general jointed areas are considered weak links. Although in certain cases these weak areas may be circumvented, it is important to make efforts towards improving the performance of established joints. Constructive solutions adapted to specific joints (and wood species) are one of the preconditions towards this am. Frequently this kind of development is merely insufficiently or not at all covered by existing standardized regulations in construction technology.

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High performance jointing techniques—State of art and development

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Nach einem Vortrag des Verfassers auf der Dreil?nder-Holztagung 1984 in Augsburg     

Analysis of the high-frequency spectrum of acoustic emission signals and its relationship to the wear resistance of filled polytetrafluoroethylene

We have performed tribotechnical tests of carbonaceous filled polytetrafluoroethylene in a wide range of loads with the recording of acoustic emission signals. Based on a spectral analysis of the sequence of rms deviations of acoustic emission signals using a discrete Fourier transform, we have constructed a normalized energy spectrum. We show that the mass wear of the material can be determined from the power of the high-frequency component of the spectrum obtained.