Coalescence of Euclidean geodesics on the Poisson-Delaunay triangulation

Let us consider Euclidean first-passage percolation on the Poisson-Delaunay triangulation. We prove almost sure coalescence of any two semi-infinite geodesics with the same asymptotic direction. The proof is based on an adapted Burton-Keane argument and makes use of the concentration property for shortest-path lengths in the considered graphs. Moreover, by considering the specific example of the relative neighborhood graph, we illustrate that our approach extends to further well-known graphs in computational geometry. As an application, we show that the expected number of semi-infinite geodesics starting at a given vertex and leaving a disk of a certain radius grows at most sublinearly in the radius.Comment: 21 pages, 7 figure

Atmosphere Selection for Long-duration Manned Space Missions

This viewgraph reviews the spacecraft environment for future human space exploration missions. The choice of a atmosphere mix will play a critical role in the ultimate safety, productivity, and cost. There are a multitude of factors involved in selection of spacecraft environments

Criteria for Selection of Materials for a Flammability Test on ISS

No abstract availabl

The Impact of Prior Performance on Leadership Appointment in a Merger of Equals

Leadership appointment during mergers has a logical and established precedent when there is a clear target and acquirer. However, in the extraordinary case of Merger Of Equals (MOEs) – where this is relative equal ownership, board representation, earnings contribution etc - this process is much less defined and can often have serious consequences on the merger, both in closing negotiations as well as post-merger performance. Intuition assumes the better performing CEO should and will be appointed. In practice, however, that is often not the case. It is arguable that performance can be defined through objective means (financially & operationally), yet CEO appointment usually is resolved through political negotiations and financial concessions. Building upon previous studies of mergers and employing public information and reported financial data in multivariate statistical analyses, this study examines two research questions pertinent to MOE leadership appointment. First – is prior performance of merger CEOs a significant predictor for leadership selection in MOEs, and second - what metrics of past performance by merger CEOs, if any, are significantly correlated with short-term financial and operational success of the merged company? Determining whether or not a relationship exists between past performance and leadership selection, as well as post-merger success can have significant influence on the leadership appointment process for Mergers of Equals

The Hydroxamate Reaction of Aminoacyl-tRNA Synthetases

Amino acids are activated as aminoacyladenylates which remain bound to the aminoacyl-tRNA synthetases that catalyze their formation. The activated amino acids are then esterified to specific transfer RNA molecules. By this reaction sequence, the specificity and energetics necessary for polypeptide synthesis are conferred upon the amino acids. The first method of determining acyl group activation was the hydroxamate assay. The activated amino acids can be trapped as the stable amino acid hydroxamates by carrying out the activation reactions in high concentrations of hydroxylamine

ISO 14624 Series - Space Systems - Safety and Compatibility of Materials Flammability Assessment of Spacecraft Materials

A viewgraph presentation on the flammability of spacecraft materials is shown. The topics include: 1) Spacecraft Fire Safety; 2) Materials Flammability Test; 3) Impetus for enhanced materials flammability characterization; 4) Exploration Atmosphere Working Group Recommendations; 5) Approach; and 6) Status of implementatio

Rr2004 Test1 and 4 Data Analysis

Test 1 data analysis for Kydex, Royal Blue Cotton, and Silicon along with test 4 data analysis for Raychem Electrical Wire is presented