Stellar and nuclear-physics constraints on two r-process components in the early Galaxy

Proceedings of "Nuclei in the Cosmos 2000", Aarhus, DanmarkComment: 3 pages, 2 figures; to be publ. in Nucl. Phys.

New attempts to understand nanodiamond stardust

We report on a concerted effort aimed at understanding the origin and history of the pre-solar nanodiamonds in meteorites including the astrophysical sources of the observed isotopic abundance signatures. This includes measurement of light elements by secondary ion mass spectrometry (SIMS), analysis of additional heavy trace elements by accelerator mass spectrometry (AMS) and dynamic calculations of r-process nucleosynthesis with updated nuclear properties. Results obtained indicate: a) there is no evidence for the former presence of now extinct 26Al and 44Ti in our diamond samples other than what can be attributed to silicon carbide and other "impurities"; this does not offer support for a supernova (SN) origin but neither does it negate it; b) analysis by AMS of platinum in "bulk diamond" yields an overabundance of r-only 198Pt that at face value seems more consistent with the neutron burst than with the separation model for the origin of heavy trace elements in the diamonds, although this conclusion is not firm given analytical uncertainties; c) if the Xe-H pattern was established by an unadulterated r-process, it must have been a strong variant of the main r-process, which possibly could also account for the new observations in platinum.Comment: Workshop on Astronomy with Radioactvities VII; Publications of the Astronomical Society of Australia, accepte

Poor Man's Content Centric Networking (with TCP)

A number of different architectures have been proposed in support of data-oriented or information-centric networking. Besides a similar visions, they share the need for designing a new networking architecture. We present an incrementally deployable approach to content-centric networking based upon TCP. Content-aware senders cooperate with probabilistically operating routers for scalable content delivery (to unmodified clients), effectively supporting opportunistic caching for time-shifted access as well as de-facto synchronous multicast delivery. Our approach is application protocol-independent and provides support beyond HTTP caching or managed CDNs. We present our protocol design along with a Linux-based implementation and some initial feasibility checks

Equilibrium magnetization in the vicinity of the first order phase transition in the mixed state of high-Tc superconductors

We present the results of a scaling analysis of isothermal magnetization M(H) curves measured in the mixed state of high-Tc superconductors in the vicinity of the established first order phase transition. The most surprising result of our analysis is that the difference between the magnetization above and below the transition may have either sign, depending on the particular chosen sample. We argue that this observation, based on M(H) data available in the literature, is inconsistent with the interpretation that the well known first order phase transition in the mixed state of high-Tc superconductors always represents the melting transition in the vortex system.Comment: 4 pages, 5 figure

Myopically Forward-Looking Agents in a Network Formation Game: Theory and Experimental Evidence

A population of players is considered in which each agent can select her neighbors in order to play a 2x2 Hawk-Dove game with each of them. We design our experiment in continuous time where participants may change their Hawk-Dove action and/or their neighborhood at any point in time. We are interested in the resulting formation of networks and the action distributions. Compared with static Nash equilibrium (e.g., Berninghaus and Vogt, 2004, 2006; Bramoulle, Lopez-Pintado, Goyal, and Vega-Redondo, 2004) and social optimum as theoretical benchmark solutions, subjects seem to employ a more complex, forward-looking thinking. We develop an other benchmark solution, called one-step-ahead stability, that combines forward-looking belief formation with rational response and that fits the data much better.

Do we eat our young and one another? Horizontal violence among signed language interpreters

The aim of this study is to research whether signed language interpreters in Ohio experience intergenerational communication conflict. The initial hypothesis was that interpreters do experience such conflict. The first phase of research was a survey of interpreters in the state of Ohio to determine whether preliminary evidence existed to suggest that new interpreters and more experienced interpreters do experience communication conflict. Such evidence was found. The second phase of research was a process of interviews with two new interpreters and two more experienced interpreters. The data revealed that while there is evidence to support that there is conflict between new and more experienced interpreters, the evidence is perhaps indicative of a larger problem in the field: horizontal violence. Both the survey data and the interview data support the idea that horizontal violence may take place in the interpreting field. Literature from the fields of education and nursing were consulted, since no research has been done about horizontal violence in the field of signed language interpreting. Information from the literature, as well as survey and interview data suggest that while new interpreters and more experienced interpreters do seem to experience conflict, such conflict is indicative of the larger problem of horizontal violence. Further research about horizontal violence in the field of signed language interpreting is recommended

Comparing Consequentialist Solutions to the Nonidentity Problem

This paper explores the nonidentity problem, an influential puzzle in modern ethics which addresses the nature of our moral responsibilities towards future generations. I begin by laying out the two conflicting intuitions comprising the problem and providing several examples to illustrate how we conceive of the moral status of future people. I then examine two versions of consequentialism, averagism and totalism, which circumvent the nonidentity problem. However, these two solutions each pose their own respective problems; thus, I argue that a modification of totalism – the critical level view – is the most viable consequentialist answer to the nonidentity problem