Fluctuations, Saturation, and Diffractive Excitation at low x

Diffractive excitation is usually described by the Good--Walker formalism for low masses, and by the triple-Regge formalism for high masses. In the Good-Walker formalism the cross section is determined by the fluctuations in the interaction. By taking the fluctuations in the BFKL ladder into account, it is possible to describe both low and high mass excitation in the Good-Walker formalism. In high energy pp collisions the fluctuations are strongly suppressed by saturation, which implies that pomeron exchange does not factorise between DIS and pp collisions. The Dipole Cascade Model reproduces the expected triple-Regge form for the bare pomeron, and the triple-pomeron coupling is estimated.Comment: 4 pages, proceedings from Diffraction 201

Quasielastic Scattering in the Dipole Model

A series of previous papers develops a dipole model in initial state impact parameter space that includes subleading effects such as running alpha strong, unitarity, confinement and saturation. Here some recent work is presented, where the model is applied to a new set of data: vector meson production in photon-proton, DVCS and t-dependence in elastic proton-proton collisions. This allows us to tune a more realistic model of the proton wavefunction from the pp data, and confirm the predictive power of the model in high Q2 of DVCS and vector meson production. For low Q2 vector meson resonances dominate the photon wavefunction, making our predictions depend on a tuned parametrisation in this range.Comment: Published in Proceedings of the 38th International Symposium on Multiparticle Dynamics (ISMD08

Nonnegative Polynomial with no Certificate of Nonnegativity in the Simplicial Bernstein Basis

This paper presents a nonnegative polynomial that cannot be represented with nonnegative coefficients in the simplicial Bernstein basis by subdividing the standard simplex. The example shows that Bernstein Theorem cannot be extended to certificates of nonnegativity for polynomials with zeros at isolated points

The Calling of Nursing

(excerpt) Baffled by the broad variety and diversity of nursing and unable to discover one single common thread of thought and discussion in the literature, I got desperate and finally turned to Dean Brown for help, hoping to get some viable direction. And, indeed, I did, yet of course not the way I expected. When I asked her if she would be so kind as to name me the standard instruction textbook used for nursing education and practice, she unhesitatingly replied: \u27There isn’t one. Because there are so many content areas in nursing, there is no one text that is considered the ultimate one that must be used by all.\u27 And when further asked about the \u27reference work for the history of nursing in the US\u27 her reply was: \u27I don’t think there is one most reliable source.\u27 So there I was, my puzzlement now confirmed by a knowledgeable authority

Global Human Thriving: A Christian Perspective

(excerpt) Talking about global human thriving from a decidedly religious point of view requires interpreting a particular religious tradition in light of today’s ubiquitous ecological, economic, and political challenges. One cannot any longer stay content with a monologic explanation of happenings based on an authoritarian, unilateral interpretation of holy writ and the wisdom of old, at least not according to the Christian perception of life and human responsibility, because global issues like climate change, water scarcity, and nuclear overkill—to mention only a few—indiscriminately threaten the continuation of all of life as known so far. These issues compel us to pursue the quest for human thriving as an interdisciplinary, transcultural, and inter-religious discourse in order to come to appropriate sustainable solutions. What can Christians contribute to this discourse