Consider a tandem queue of two single-server stations with only one server for both stations, who may allocate a fraction α of the service capacity to station 1 and 1−α to station 2 when both are busy. A recent paper treats this model under classical Poisson, exponential assumptions. Using work conservation and FIFO, we show that on every sample path (no stochastic assumptions), the waiting tim...

This report proposes and evaluates a number of tandem feature extraction schemes. The proposed schemes use confidence measures estimated from the MLP outputs to derive tandem-like features. The analysis of variance shows that the proposed features discriminate better between phone classes than conventional tandem features. But they become less discriminant as the HMM model become more complex i...

The SAR geolocation accuracy using TerraSAR and TanDEM-X data has been demonstrated to be into centimeter level with no need of any reference frame. This paper is intended to show potential applications over maritime scenarios based on precise absolute measurements. Two specific applications are discussed and analyzed. The first one is to measure ships 2D velocity using TanDEM-X products. The s...

Tandem structures can boost the efficiency of organic solar cell to more than 15%, compared to the 10% limit of single layer bulk heterojunction devices. Design and fabricating of intermediate layers plays a very important role to achieve high device performance. This article will review the main experimental progresses of tandem organic solar cells, and focus on the intermediate layers (charge...

F indings on page 747 suggest that multiple subunits of coiled-coil proteins may meet even before each subunit is fully translated. The article from Chang et al. reveals that the precursors to intermediate fi laments (IFs) assemble at tiny translation factories containing several mRNAs. Dimers of IFs, such as the neuronal protein peripherin, form into higher-order assemblies. Before they form f...

PURPOSE The uterine tandem with open-ended vaginal cylinder is the most commonly used brachytherapy system for Federation Internationale de Gynecologie et d'Obstetrique (FIGO) Stage IIIA cervix cancer at the National Cancer Centre, Singapore. Without the 3-channel ovoid system, the dose to the parametrium is often compromised. In this study, a vaginal cylinder that could potentially be incorpor...

an efficient one-pot oxidation/condensation tandem process has been developed for the synthesis of 2-substituted benzimidazole derivatives from benzylic alcohols and 1,2-phenylenediamine with use of urea-hydrogen peroxide/silica phosphoric acid  as a bifunctional catalyst. this method provides a rapid and efficient access to 2-substituted benzimidazoles.

To transfer to the laboratory, the excellent efficiency shown by enzymes in Nature, biocatalysis, had to mimic several synthetic strategies used by the living organisms. Biosynthetic pathways are examples of tandem catalysis and may be assimilated in the biocatalysis field for the use of isolated multi-enzyme systems in the homogeneous phase. The concurrent action of several enzymes that work s...