The evolution of the 1952 nursing practice act in the state of Rhode Island and Providence plantations.

Thesis (M.S.)--Boston Universit

Library Initiative Confronts Challenges of Human Rights Documentation and Research

Latin American Studie

Dark Energy and Dark Matter in f(R)f(R) Gravity and an Alternative Chameleon Mechanism

Metric $f(R)$ gravity theories behave like GR with cosmological constant when $f"(R)$ = 0, and like scalar-tensor theories elsewhere. I investigate the transition from $f"(R) \neq 0$ to $f"(R) = 0$, and show that this theory may offer a way to explain Dark Energy and/or Dark Matter without having to make use of the chameleon mechanism to agree with solar system tests

ACORN Organizing & Chicago Homecare Workers

[Excerpt] Every few months our office receives some piece of direct mail concerning a conference or seminar on union organizing put on by some professional salesperson. The piece extolls the virtues of professional sales techniques for selling the union to prospective union members. We throw these advertisements away. Nothing could be more foreign to ACORN\u27s way of doing things. The idea that a union organizer\u27s job is to sell his or her union is totally alien to our model for labor organizing, a model which was developed out of ACORN\u27s years of experience with successful community organizing. When we organize a company, the organizer\u27s job is to be a catalyst or contact person, to listen to peoples\u27 perceptions of what they would like to see improved where they work and to help them realize these aspirations through self-organization and action. ACORN — the Association of Community Organizations for Reform Now — formed the United Labor Unions (ULU) in 1978 with the purpose of organizing low-wage workers in industries and regions that traditional unions were not organizing

The large-parts formula for p(n)

A new formula for the partition function $p(n)$ is developed. We show that the number of partitions of $n$ can be expressed as the sum of a simple function of the two largest parts of all partitions. Specifically, if $a_1 + >... + a_k = n$ is a partition of $n$ with $a_1 \leq ... \leq a_k$ and $a_0 = 0$, then the sum of $\lfloor(a_k + a_{k-1}) / (a_{k-1} + 1)\rfloor$ over all partitions of $n$ is equal to $2p(n) - 1$.Comment: Four pages; 1 figur

Análisis de daño y estudio de tensiones residuales en componentes mecánicos

Conferencia invitadaUnderstanding the effect of residual stresses in critical for the structural integrity of railway and other mechanical components [1–3]. The most important methods for residual stress measurements are introduced, together with their main advantages and disadvantages [4]. Neutron and synchrotron strain measurements performed in European Synchrotron Radiation Facility (France) [5], Institut Laue Langevin (France) [1], Diamond Light Source (UK) [6,7] and ISIS Neutron and Muon Source (UK) are described. They allow the in-plane components of the stress tensor acting in cross-sectional rail slices to be mapped [8–10]. Alternative techniques such as laboratory X-rays and magnetic measurement systems MAPS are also depicted, showing coarser detail but similar trends than previous methods. Stress balancing appears to be worst in zones where significant plastic deformation takes place [11,12]. In addition, the measurements are complemented with contour method analysis to map the longitudinal stress components. REFERENCES [1] J.F. Kelleher, Residual Stress in Railway Rails, PhD thesis, University of Manchester, School of Materials, 2006. [2] B. Moreno, A. Martin, P. Lopez-Crespo, J. Zapatero, J. Dominguez, Estimations of fatigue life and variability under random loading in aluminum Al-2024T351 using strip yield models from NASGRO, International Journal of Fatigue. 91 (2016) 414–422. [3] C.A. Simpson, S. Kozuki, P. Lopez-Crespo, M. Mostafavi, T. Connolley, P.J. Withers, Quantifying fatigue overload retardation mechanisms by energy dispersive X-ray diffraction, Journal of the Mechanics and Physics of Solids. 124 (2019) 392–410. [4] P.J. Withers, H.K.D.H. Bhadeshia, Residual stress. Part 1 - Measurement techniques, Materials Science and Technology. 17 (2001) 355–365.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Departamento de Ingeniería Civil, de Materiales y Fabricació

Difracción de rayos X y difracción de neutrones en estudios de fatiga y fractura de materiales

Conferencia invitada de Joseph F KelleherThe fatigue behaviour of polycrystalline metals is often studied through crack propagation analysis [1,2]. Nevertheless, understanding the mechanical processes that take place right at the crack tip [3,4] would also involve considering the deformation developing at the plastic zone and the contact between the crack faces over a portion of the loading cycle [5–7]. Paris law or newer models such as Forman equation are commonly used to interpret growth data [8], but cannot be used to generalise for complex loading scenarios, such as multiaxial loads [9–11] or variable amplitude loads [2]. Diffraction methods are a powerful tool to characterise crack tip strains and stresses [12]. The basics principles of neutron and synchrotron diffraction for measuring bulk properties are discussed [13,14], with special emphasis on grain size effects [15,16], transition between plane stress and plain strain conditions [17], measurement of the plastic zone and development of shielding effects at the crack tip [18]. REFERENCES [1] P. Lopez-Crespo, P.J. Withers, F. Yusof, H. Dai, A. Steuwer, J.F. Kelleher, T. Buslaps, Overload effects on fatigue crack-tip fields under plane stress conditions: surface and bulk analysis, Fatigue and Fracture of Engineering Materials and Structures. 36 (2013) 75–84. [2] B. Moreno, A. Martin, P. Lopez-Crespo, J. Zapatero, J. Dominguez, Estimations of fatigue life and variability under random loading in aluminum Al-2024T351 using strip yield models from NASGRO, International Journal of Fatigue. 91 (2016) 414–422. [3] C. Bathias, Retrospective view on the role of the plastic zone at a fatigue crack tip, Fatigue and Fracture of Engineering Materials and Structures. 19 (1996) 1301–1306. [4] P. Lopez-Crespo, D. Camas, F. V Antunes, J.R. Yates, A study of the evolution of crack tip plasticity along a crack front, Theoretical and Applied Fracture Mechanics. 98 (2018) 59–66.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Departamento de Ingeniería Civil, de Materiales y Fabricació