An exploratory study of the nursing functions of inactive nurses as experienced by nursing requests made of the inactive nurse

Thesis (M.S.)--Boston Universit

Conduction Mapping for Quality Control of Laser Powder Bed Fusion Additive Manufacturing

A process was developed to identify potential defects in previous layers of Selective Laser Melting (SLM) Powder Bed Fusion (PBF) 3D printed metal parts using a mid-IR thermal camera to track infrared 3.8-4 m band emission over time as the part cooled to ambient temperature. Efforts focused on identifying anomalies in thermal conduction. To simplify the approach and reduce the need for significant computation, no attempts were made to calibrate measured intensity, extract surface temperature, apply machine learning, or compare measured cool-down behavior to computer model predictions. Raw intensity cool-down curves were fit to a simplified functional form designed to approximate the behavior of radiative, conductive, and convective heat transfer, yielding a conductivity parameter. This parameter was able to identify minor changes, less than twenty five percent, in the thickness of a single layer of the walls of single-pass, thin-wall structures and the presence of underlying unfused powder. Small voids were not produced in the test prints analyzed here. The thermal signature of underlying fusion defects, as measured by the conductivity parameter, is clearly present for many layers. This method was shown to be effective in detecting changes in conductivity of the material which represents a large portion of the defects commonly found in SLM additive manufacturing

The (In)Stability Of The Relationship Between Stocks, Bonds And Managed Futures

This study re-examines the traditional belief that futures contracts have very low and, in some cases, negative correlations with stocks and bonds.  Specifically, it looks at the stability of the correlations between five indices of futures market performance and two stock and bond indices over various holding periods.  Results show that large positive correlations occur over short holding periods, but over the long run, the relationship is fairly stable, in particular for certain indices

Optical properties of current carrying molecular wires

We consider several fundamental optical phenomena involving single molecules in biased metal-molecule-metal junctions. The molecule is represented by its highest occupied and lowest unoccupied molecular orbitals, and the analysis involves the simultaneous consideration of three coupled fluxes: the electronic current through the molecule, energy flow between the molecule and electron-hole excitations in the leads and the incident and/or emitted photon flux. Using a unified theoretical approach based on the non-equilibrium Green function method we derive expressions for the absorption lineshape (not an observable but a ueful reference for considering yields of other optical processes) and for the current induced molecular emission in such junctions. We also consider conditions under which resonance radiation can induce electronic current in an unbiased junction. We find that current driven molecular emission and resonant light induced electronic currents in single molecule junctions can be of observable magnitude under appropriate realizable conditions. In particular, light induced current should be observed in junctions involving molecular bridges that are characterized by strong charge transfer optical transitions. For observing current induced molecular emission we find that in addition to the familiar need to control the damping of molecular excitations into the metal substrate the phenomenon is also sensitive to the way in which the potential bias si distributed on the junction.Comment: 56 pages, 8 figures; submitted to JC

Development and testing of porous ionizer materials, part I Summary report, Feb. 1965 - May 1966

Development and testing of porous tungsten ionizer materials for cesium contact engine

A phenomenological study of Irish and Portuguese women’s experiences of receiving family support when studying STEM subjects at technical institutes

Comunicação apresentada na 44th SEFI Conference, 12-­15 September 2016, Tampere, FinlandThis paper reports a research study of women’s experiences of receiving family support when studying science, technology, engineering, and mathematics (STEM) subjects at technical institutes in Ireland and Portugal. Specifically, it reports phenomenological analysis of 19 interviews conducted during the 2014-­2015 academic years with female students studying engineering subjects at technical institutes in Ireland and Portugal. It identifies forms of positive support received from family as well as problematic family dynamics and concerns. Parents, uncles, and aunts provide many positive forces, as do surrogates (i.e., adopted family and close mentors). Cousins and brothers also provide role models and information. For our participants, meeting family obligations and being first-­generation college students presents some challenges and stress

Mountains of Maize, Persistent Poverty

The past two years are a tribute to Zambian farmers; they have responded admirably to government efforts to promote maize production. But ironically, rural poverty remains stubbornly high despite the fact that the government has spent over 2% of the nation’s gross domestic product in supporting maize production and subsidizing inputs for farmers. Why is it that maize production has increased so impressively without making a serious dent in rural poverty? And what are the lessons for the new government?maize, poverty, Zambia, Agricultural and Food Policy, Food Security and Poverty,

The Value Line Enigma Extended - An Examination Of the Performance Of Option Recommendations

We extend the research on the Value Line Enigma by examining the performance of call recommendations in Value Line Options. Galai\u27s hedge decomposition procedure identifies the components of the calls\u27 returns. Abnormal call returns were most pronounced immediately following the purchase, which is consistent with studies of Value Line\u27s stock rankings. The largest and most significant abnormal performance was by calls assigned the highest rank written on stocks judged by Value Line to be correctly priced. Abnormal call return performance by joint call and stock ranks was consistent with the hypothesis that Value Line identifies underpriced call options