Determination of biaxial creep strength of T-111 tantalum alloy Semiannual report, Mar. 8 - Sep. 8, 1967

Creep behavior of T-111 alloy tubing under biaxial stress and stress effects on corrosion behavior of T-111 alloy with potassiu

Determination of biaxial creep strength of T-111 tantalum alloy

Biaxial creep strength of T-111 tantalum alloy tubing in high temperature, high vacuum environmen

Determination of biaxial creep strength of T-111 tantalum alloy Semiannual report, 8 Mar. - 8 Sep. 1968

Effects of stress on corrosion behavior of T-111 tantalum alloy for tube

Determination of biaxial creep strength of T-111 tantalum alloy Semiannual report, 8 Sep. 1968 - 8 Mar. 1969

Biaxial creep behavior of tantalum alloy tubing and stress corrosion by potassiu

Corrosion resistance of tantalum, T 111, and Cb-1Zr to mercury at 1200 F

High temperature mercury corrosion resistance of tantalum, tantalum alloy, and niobium alloy sheets after bending stres

Evaluation of high strength columbium alloys for alkali metal containment interim report no. 2, jul. 25, 1962 - jul. 10, 1964

Alkali metal containment of three high strength columbium alloy reflex capsule

Evaluation of high strength columbium alloys for alkali metal containment Final report, 25 Jul. 1962 - 15 Dec. 1964

High strength niobium alloy corrosion testing and evaluation of alkali metal containmen

Photoproduction off Nuclei and Point-like Photon Interactions Part I: Cross Sections and Nuclear Shadowing

High energy photoproduction off nuclear targets is studied within the Glauber-Gribov approximation. The photon is assumed to interact as a $q\bar{q}$-system according to the Generalized Vector Dominance Model and as a ``bare photon'' in direct scattering processes with target nucleons. We calculate total cross sections for interactions of photons with nuclei taking into account coherence length effects and point-like interactions of the photon. Results are compared to data on photon-nucleus cross sections, nuclear shadowing, and quasi- elastic $\rho$-production. Extrapolations of cross sections and of the shadowing behaviour to high energies are given.Comment: 15 pages, 12 figure

Scale-free memory model for multiagent reinforcement learning. Mean field approximation and rock-paper-scissors dynamics

A continuous time model for multiagent systems governed by reinforcement learning with scale-free memory is developed. The agents are assumed to act independently of one another in optimizing their choice of possible actions via trial-and-error search. To gain awareness about the action value the agents accumulate in their memory the rewards obtained from taking a specific action at each moment of time. The contribution of the rewards in the past to the agent current perception of action value is described by an integral operator with a power-law kernel. Finally a fractional differential equation governing the system dynamics is obtained. The agents are considered to interact with one another implicitly via the reward of one agent depending on the choice of the other agents. The pairwise interaction model is adopted to describe this effect. As a specific example of systems with non-transitive interactions, a two agent and three agent systems of the rock-paper-scissors type are analyzed in detail, including the stability analysis and numerical simulation. Scale-free memory is demonstrated to cause complex dynamics of the systems at hand. In particular, it is shown that there can be simultaneously two modes of the system instability undergoing subcritical and supercritical bifurcation, with the latter one exhibiting anomalous oscillations with the amplitude and period growing with time. Besides, the instability onset via this supercritical mode may be regarded as "altruism self-organization". For the three agent system the instability dynamics is found to be rather irregular and can be composed of alternate fragments of oscillations different in their properties.Comment: 17 pages, 7 figur

Goldstone Fermion Dark Matter

We propose that the fermionic superpartner of a weak-scale Goldstone boson can be a natural WIMP candidate. The p-wave annihilation of this `Goldstone fermion' into pairs of Goldstone bosons automatically generates the correct relic abundance, whereas the XENON100 direct detection bounds are evaded due to suppressed couplings to the Standard Model. Further, it is able to avoid indirect detection constraints because the relevant s-wave annihilations are small. The interactions of the Goldstone supermultiplet can induce non-standard Higgs decays and novel collider phenomenology.Comment: 25 pages, 6 figures. References added, minor typos corrected. Submitted to JHE