Non-Profit Firms and the Provision of Durable Goods

A simple linear demand two-period durable goods is analyzed where the durable good is provided by private non-profit organization (NPO). A novel flexible objective function is utilized that allows for both the “commercial” and “social concern” aspects of NPOs. The model indicates NPO’s will not typically provide the efficient cost-minimizing durability in sales markets. Indeed, if the NPO cannot credibly commit to its own stakeholders it will manufacture output with less durability than a pure for-profit seller. We show the NPO’s level of commitment ability and social concern with its stakeholders is crucial for determining the amount of “planned obsolescence” that would prevail if NPOs expand into durable goods markets. Interestingly, the social concern commonly cited for the existence of NPOs, is a double edged sword since it may cause more or less product obsolescence.

Vanishing Fe 3d orbital moments in single-crystalline magnetite

We show detailed magnetic absorption spectroscopy results of an in situ cleaved high quality single crystal of magnetite. In addition the experimental setup was carefully optimized to reduce drift, self absorption, and offset phenomena as far as possible. In strong contradiction to recently published data, our observed orbital moments are nearly vanishing and the spin moments are quite close to the integer values proposed by theory. This very important issue supports the half metallic full spin polarized picture of magnetite.Comment: 7 pages, 4 figure

Induced magnetism of carbon atoms at the graphene/Ni(111) interface

We report an element-specific investigation of electronic and magnetic properties of the graphene/Ni(111) system. Using magnetic circular dichroism, the occurrence of an induced magnetic moment of the carbon atoms in the graphene layer aligned parallel to the Ni 3d magnetization is observed. We attribute this magnetic moment to the strong hybridization between C $\pi$ and Ni 3d valence band states. The net magnetic moment of carbon in the graphene layer is estimated to be in the range of $0.05-0.1 \mu_B$ per atom.Comment: 10 pages, 3 figure

Magnetic coupling in highly-ordered NiO/Fe3O4(110): Ultrasharp magnetic interfaces vs. long-range magnetoelastic interactions

We present a laterally resolved X-ray magnetic dichroism study of the magnetic proximity effect in a highly ordered oxide system, i.e. NiO films on Fe3O4(110). We found that the magnetic interface shows an ultrasharp electronic, magnetic and structural transition from the ferrimagnet to the antiferromagnet. The monolayer which forms the interface reconstructs to NiFe2O4 and exhibits an enhanced Fe and Ni orbital moment, possibly caused by bonding anisotropy or electronic interaction between Fe and Ni cations. The absence of spin-flop coupling for this crystallographic orientation can be explained by a structurally uncompensated interface and additional magnetoelastic effects

Strain and composition dependence of the orbital polarization in nickelate superlattices

A combined analysis of x-ray absorption and resonant reflectivity data was used to obtain the orbital polarization profiles of superlattices composed of four-unit-cell-thick layers of metallic LaNiO3 and layers of insulating RXO3 (R=La, Gd, Dy and X=Al, Ga, Sc), grown on substrates that impose either compressive or tensile strain. This superlattice geometry allowed us to partly separate the influence of epitaxial strain from interfacial effects controlled by the chemical composition of the insulating blocking layers. Our quantitative analysis reveal orbital polarizations up to 25%. We further show that strain is the most effective control parameter, whereas the influence of the chemical composition of the blocking layers is comparatively small.Comment: 9 pages, 8 figure

An Intercultural Study in Health Literacy and Adherence among Patients with Diabetes

poster abstractHealth Literacy is believed to play an essential role in the ability of individuals to effectively manage their own health care. A report by the Institute of Medicine acknowledges that 90 million Americans with low literacy probably also have low health literacy, and that even individuals with adequate health literacy face challenges in the complex demands of health care contexts. This poster presents results of a 3-year study of an interdisciplinary project on health literacy and adherence at the Indiana Center for Intercultural Communication (ICIC) funded by the Eli Lilly & Co. Foundation. The purpose was to examine multiple dimensions of health literacy, based on patients’ perspectives (van Dulmen et al., 2008), with the goal of creating a new conceptualization and way of assessing health literacy in its broader sense that includes processing and acting on information in order to integrate those findings into interventions to improve health regimen adherence. Taking critical studies into account, we developed a model to identify the most important variables of adherence (Nutbeam, D., 2000; Levin-Zamir, D. and Peterburg, Y., 2001; Von Wagner, C., Steptoe, A., Wolf, M., and Wardle, J., 2008). The data consisted of video-taped interviews with 43 English-speakers and 21 Spanish-speakers, all of whom have diabetes. The interviews involved open-ended questions that elicited information about living with diabetes as well as questions on health beliefs, medication adherence, information sources and uses, literacy level and basic demographic information. These narratives were analyzed using grounded theory methodology of the patients’ own words. The quantitative data were analyzed using a multivariate analysis as well as an ordered probit analysis (Connor, U., et al., 2008, 2009, 2010; Lauten, K., et al., 2009, 2010; Lopez-Yunez, A., et al., 2009; Matthias, M.S. & Goering, E., 2008; Rozycki, W. & Connor, U., 2008; Wolf, M.S., et al, 2007). The model that ICIC has built provides practical interventions for patient-centered care. This poster presents examples of linguistic cues and phrases from the interviews, the results of the intercultural comparisons between which information sources were used in the English-speaking and Spanish-speaking subgroups, and the resultant model. Implications are discussed in terms of enhancing the patient-centered tailoring of health information and communication.

The World According To GARP

This technical report consists of two papers describing the GARP concurrent programming system. Garp: Graph Abstractions for Concurrent Programming investigates construction of dynamic process topologies in parallel processing languages. It proposes the use of a graph-grammar based formalism to control the complexities arising from trying to program such dynamic networks. Garp: A Graphical Language for Concurrent Programming describes the GARP system, a programming environment that implements this graph-grammar approach, and gives solutions to example problems in which the topologies of concurrent systems dynamically change

Element-Specific Depth Profile of Magnetism and Stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 Interface

Depth-sensitive magnetic, structural and chemical characterization is important in the understanding and optimization of novel physical phenomena emerging at interfaces of transition metal oxide heterostructures. In a simultaneous approach we have used polarized neutron and resonant X-ray reflectometry to determine the magnetic profile across atomically sharp interfaces of ferromagnetic La0.67Sr0.33MnO3 / multiferroic BiFeO3 bi-layers with sub-nanometer resolution. In particular, the X-ray resonant magnetic reflectivity measurements at the Fe and Mn resonance edges allowed us to determine the element specific depth profile of the ferromagnetic moments in both the La0.67Sr0.33MnO3 and BiFeO3 layers. Our measurements indicate a magnetically diluted interface layer within the La0.67Sr0.33MnO3 layer, in contrast to previous observations on inversely deposited layers. Additional resonant X-ray reflection measurements indicate a region of an altered Mn- and O-content at the interface, with a thickness matching that of the magnetic diluted layer, as origin of the reduction of the magnetic moment.Comment: 13 pages, 4 figures, supplemental material include

Valence band excitations in V_2O_5

We present a joint theoretical and experimental investigation of the electronic and optical properties of vanadium pentoxide. Electron energy-loss spectroscopy in transmission was employed to measure the momentum-dependent loss function. This in turn was used to derive the optical conductivity, which is compared to the results of band structure calculations. A good qualitative and quantitative agreement between the theoretical and the experimental optical conductivity was observed. The experimentally observed anisotropy of the optical properties of V_2O_5 could be understood in the light of an analysis of the theoretical data involving the decomposition of the calculated optical conductivity into contributions from transitions into selected energy regions of the conduction band. In addition, based upon a tight binding fit to the band structure, values are given for the effective V3d_xy-O2p hopping terms and are compared to the corresponding values for alpha'-NaV_2O_5.Comment: 6 pages (revtex),6 figures (jpg

Photoemission study of the metal-insulator transition in VO_2/TiO_2(001) : Evidence for strong electron-electron and electron-phonon interaction

We have made a detailed temperature-dependent photoemission study of VO_2/TiO_2(001) thin films, which show a metal-insulator transition at \sim 300 K. Clean surfaces were obtained by annealing the films in an oxygen atmosphere. Spectral weight transfer between the coherent and incoherent parts accompanying the metal-insulator transition was clearly observed. We also observed a hysteretic behavior of the spectra for heating-cooling cycles. We have derived the ``bulk'' spectrum of the metallic phase and found that it has a strong incoherent part. The width of the coherent part is comparable to that given by band-structure calculation in spite of its reduced spectral weight, indicating that the momentum dependence of the self-energy is significant. This is attributed to by ferromagnetic fluctuation arising from Hund's rule coupling between different d orbitals as originally proposed by Zylbersztejn and Mott. In the insulating phase, the width of the V 3d band shows strong temperature dependence. We attribute this to electron-phonon interaction and have reproduced it using the independent boson model with a very large coupling constant.Comment: 7 pages, 7 figures, submitted to Phys. Rev.