One and two loop self-energies are worked out explicitly for a heavy scalar field interacting weakly with a light self-interacting scalar field at finite temperature. The ring/daisy diagrams and a set of necklace diagrams can be summed simultaneously. This simple model serves to illustrate the connection between multi-loop self-energy diagrams and multiple scattering in a medium. PACS numbers: ...

The paper shows a distributed architecture for autonomous robot navigation. The architecture is based on three modules that are implemented on separate and interacting agents: the target recognizer, the obsta90cle evaluator and the planner. An adaptive genetic algorithm has been studied to identify mechanisms for reaching the target and for manipulating the 2-diretions of the robot; the distrib...

A porphyrin functionalised with pillar[5]arene and a viologen at its 5- and 15-meso positions assembles in a head-to-tail manner, producing linear supramolecular daisy chains in dichloromethane. At high concentrations, it forms an organogel which has been investigated by electron microscopy and rheological measurements, paving the way for the preparation of other functional supramolecular assem...

Pad cratering refers to the initiation and propagation of fine cracks beneath BGA pads in organic substrates or printed circuit boards. These cracks, which usually initiate under the application of excessive mechanical loads, represent a serious reliability concern for the industry. In typical board level reliability tests, solder joint failures are detected by an increase in electrical resista...

............................................................................................................................. v Resumen........................................................................................................................... vii Resum................................................................................................................................ ...

All UW undergraduate submissions are welcome. Papers must be philosophical in content, and may consist of extracurricular essays, course-related essays, discussions, book reviews, and responses to previous articles. Submissions should be typed in Times New Roman, 12-point font, and double-spaced. Please keep submissions under 15 pages in length, and attach a 100-300 word abstract or summary of ...