LUMEN Thrust Chamber - Injector Design and Stability Analysis

The LUMEN project at the DLR Institute of Space Propulsion has the goal of producing a bread-board demonstrator engine powered by LOX/LNG. This paper describes the design of the baseline injection system for the LUMEN thrust chamber which uses the advance porous injector (API) concept. Numerical analysis of internal flow characteristics and acoustics of the injector used in the design phase are presented. The injection system was designed to avoid injection-coupled combustion instabilities. A prediction of the low-frequency stability characteristics is also presented

Syntactical And Semantical Description Of Video Sequences

Archiving, processing, and intelligent retrieval of digital video sequences can be efficiently solved by a high-level representation of video sequences. We describe a complete system for encoding the context of video..

Up-regulating the human intestinal microbiome using whole plant foods, polyphenols, and/or fiber

Whole plant foods, including fruit, vegetables, and whole grain cereals, protect against chronic human diseases such as heart disease and cancer, with fiber and polyphenols thought to contribute significantly. These bioactive food components interact with the gut microbiota, with gut bacteria modifying polyphenol bioavailability and activity, and with fiber, constituting the main energy source for colonic fermentation. This paper discusses the consequences of increasing the consumption of whole plant foods on the gut microbiota and subsequent implications for human health. In humans, whole grain cereals can modify fecal bacterial profiles, increasing relative numbers of bifidobacteria and lactobacilli. Polyphenol-rich chocolate and certain fruits have also been shown to increase fecal bifidobacteria. The recent FLAVURS study provides novel information on the impact of high fruit and vegetable diets on the gut microbiota. Increasing whole plant food consumption appears to upregulate beneficial commensal bacteria and may contribute toward the health effects of these foods