As the startup Low-Energy Beam Transport (LEBT) for the Spallation Neutron Source (SNS) project is undergoing commissioning aimed at transporting a 35-mA Hbeam, a new LEBT layout has been developed that is designed to transport a beam current of 65 mA, consistent with the revised nominal SNS beampower goal of 2 MW. The SNS LEBT employs two electrostatic einzel lenses and provides static beam st...

The rendezvous problem in graphs has been extensively studied in the literature, mainly using a randomized approach. Two mobile agents have to meet at some node of a connected graph. We study deterministic algorithms for this problem, assuming that agents have distinct identifiers and are located in nodes of an unknown anonymous connected graph. Startup times of the agents are arbitrarily decid...

In this paper we develop parallel A* algorithms suitable for distributed-memory machines. In parallel A* algorithms , ineeciencies grow with the number of processors P used, causing performance to drop signiicantly at lower and intermediate work densities (the ratio of the problem size to P). To alleviate this eeect, we propose a novel parallel startup phase and eecient dynamic work distributio...

In this study, experimental constant-current cold starts were performed on a polymer electrolyte fuel cell from −10°C to characterize high-frequency resistance behavior, water motion, and ice accumulation before, during, and after cold start. A diagnostic method for rapid and repeatable cold starts was developed and verified. Cold-start performance is found to be optimized when cell resistance ...

Previous work in leakage current reduction for digital circuits can be divided into two main categories: static design-time selection of slow, low-leakage transistors for non-critical paths and dynamic deactivation of fast leaky transistors on critical paths. Leakage power is dominated by critical paths, and hence dynamic deactivation of fast transistors could potentially yield large savings. W...

This paper examines how university research alliances and other cooperative links with universities contribute to startup employment growth. We argue that “scientific absorptive capacity” at the startup is critical for reaping the benefits from university research alliances, but not necessarily for other university connections. We also estimate the aggregate employment contribution from startup...

Novel startup companies often face not only risk, but also unforeseeable uncertainty (the inability to recognize and articulate all relevant variables affecting performance). The literature recognizes that established risk planning methods are very powerful when the nature of risks is well understood, but that they are insufficient for managing unforeseeable uncertainty. For this case, two fund...