Comparing the Risk Attitudes of U.S. and German Farmers

Risk and Uncertainty,

Solar Magnetic Tracking. IV. The Death of Magnetic Features

The removal of magnetic flux from the quiet-sun photosphere is important for maintaining the statistical steady-state of the magnetic field there, for determining the magnetic flux budget of the Sun, and for estimating the rate of energy injected into the upper solar atmosphere. Magnetic feature death is a measurable proxy for the removal of detectable flux. We used the SWAMIS feature tracking code to understand how nearly 20000 detected magnetic features die in an hour-long sequence of Hinode/SOT/NFI magnetograms of a region of quiet Sun. Of the feature deaths that remove visible magnetic flux from the photosphere, the vast majority do so by a process that merely disperses the previously-detected flux so that it is too small and too weak to be detected. The behavior of the ensemble average of these dispersals is not consistent with a model of simple planar diffusion, suggesting that the dispersal is constrained by the evolving photospheric velocity field. We introduce the concept of the partial lifetime of magnetic features, and show that the partial lifetime due to Cancellation of magnetic flux, 22 h, is 3 times slower than previous measurements of the flux turnover time. This indicates that prior feature-based estimates of the flux replacement time may be too short, in contrast with the tendency for this quantity to decrease as resolution and instrumentation have improved. This suggests that dispersal of flux to smaller scales is more important for the replacement of magnetic fields in the quiet Sun than observed bipolar cancellation. We conclude that processes on spatial scales smaller than those visible to Hinode dominate the processes of flux emergence and cancellation, and therefore also the quantity of magnetic flux that threads the photosphere.Comment: Accepted by Ap

Optical characterization of LDEF contaminant film

Dark brown molecular film deposits were found at numerous locations on the Long Duration Exposure Facility (LDEF) and have been documented in great detail by several investigators. The exact deposition mechanism for these deposits is as yet unknown, although direct and scattered atomic oxygen, and solar radiation interacting with materials outgassing products have all been implicated in the formation process. Specimens of the brown molecular film were taken from below the flange of the experimental tray located at position D10 on the LDEF. The tray was one of two, comprising the same experiment, the other being located on the wake facing side of the LDEF satellite at position B4. Having access to both trays, we were able to directly compare the effect that orientation with respect to the atomic oxygen flux vector had on the formation of the brown molecular film deposits. The film is thickest on surfaces facing toward the exterior, i.e. the tray corner, as can be seen by comparing the lee and wake aspects of the rivets. The patterns appear to be aligned not with the velocity vector but with the corner of the tray suggesting that flux to the surface is due to scattered atomic oxygen rather than direct ram impingement. The role of scattered flux is further supported by more faint plume patterns on the sides of the tray. The angle of these plumes is strongly aligned with the ram direction but the outline of the deposit implies that incident atoms are scattered by collisions with the edges of the opening resulting in a directed, but diffuse, flux of atomic oxygen to the surface. Spectral reflectance measurements in the 2 to 10 micron (4000 to 1000 wavenumbers) spectral range are presented for the film in the 'as deposited' condition and for the free standing film. The material was analyzed by FTIR (Fourier Transform Infrared) microspectroscopy using gold as the reference standard. The 'as deposited' specimen was on an aluminum rivet taken from beneath the tray flange while the free film was obtained by chipping some of the material from the rivet. The transmission spectrum over the 2 to 10 micron range for the free film is presented. This spectrum appears to be essentially the same as that presented by Crutcher et.al. for films formed at vent sites which faced into the ram direction and suggested to originate from urethanes and silicones used on the LDEF. Banks et. al. state that silicones, when exposed to atomic oxygen, release polymeric scission fragments which deposit on surfaces and form a glassy, dark contaminant layer upon further atomic oxygen exposure and solar irradiation

Analysis of a Convective Reaction-Diffusion Equation II

We study the large time behavior of positive solutions of the semilinear parabolic equation $u_t = u_{xx} + \varepsilon (g(u))_x + f(u)$, $0 \u3c x \u3c L$, $\varepsilon \in {\bf R}$, subject to $u(0,t) = u(L,t) = 0$. The model problem in which the results apply is $g(u) = u^m$ and $f(u) = u^p 1 \leqq m \u3c p$. The steady state problem is analyzed in some detail, and results about finite time blow up are proved

Wealth Building in Rural America: Perspective, Knowledge, Outlook

Wealth Building in Rural America: Perspective, Knowledge, Outloo

Community pharmacy-based medication therapy management services: financial impact for patients

This is the published version. Copyright 2012 Centro de Investigaciones y Publicaciones Farmaceuticas.Objective: To determine the direct financial impact for patients resulting from Medication Therapy Management (MTM) interventions made by community pharmacists. Secondary objectives include evaluating the patient and physician acceptance rates of the community pharmacists’ recommended MTM interventions. Methods: This was a retrospective observational study conducted at 20 Price Chopper and Hen House grocery store chain pharmacies in the Kansas City metro area from January 1, 2010 to December 31, 2010. Study patients were Medicare Part D beneficiaries eligible for MTM services. The primary outcome was the change in patient out-ofpocket prescription medication expense as a result of MTM services. Results: Of 128 patients included in this study, 68% experienced no out-of-pocket financial impact on their medication expenses as a result of MTM services. A total of 27% of the patients realized a cost-savings (USD440.50 per year, (SD=289.69)) while another 5% of patients saw a cost increase in out-of-pocket expense (USD255.66 per year, (SD=324.48)). The net financial impact for all 128 patients who participated in MTM services was an average savings of USD102.83 per patient per year (SD=269.18, p<0.0001). Pharmacists attempted a total of 732 recommendations; 391 (53%) were accepted by both the patient and their prescriber. A total of 341 (47%) recommendations were not accepted because of patient refusal (290, 85%) or prescriber refusal (51, 15%). Conclusions: Patient participation in MTM services reduces patient out-of-pocket medication expense. However, this savings is driven by only 32% of subjects who are experiencing a financial impact on out-of-pocket medication expense. Additionally, the majority of the pharmacists’ recommended interventions (53%) were accepted by patients and prescribers