Cyclic and constant temperature aging effects on magnetic materials for inverters and converters

Cyclic and constant temperature aging effects on magnetic materials for inverters and converter

Computation of a combined spherical-elastic and viscous-half-space earth model for ice sheet simulation

This report starts by describing the continuum model used by Lingle & Clark (1985) to approximate the deformation of the earth under changing ice sheet and ocean loads. That source considers a single ice stream, but we apply their underlying model to continent-scale ice sheet simulation. Their model combines Farrell's (1972) elastic spherical earth with a viscous half-space overlain by an elastic plate lithosphere. The latter half-space model is derivable from calculations by Cathles (1975). For the elastic spherical earth we use Farrell's tabulated Green's function, as do Lingle & Clark. For the half-space model, however, we propose and implement a significantly faster numerical strategy, a spectral collocation method (Trefethen 2000) based directly on the Fast Fourier Transform. To verify this method we compare to an integral formula for a disc load. To compare earth models we build an accumulation history from a growing similarity solution from (Bueler, et al.~2005) and and simulate the coupled (ice flow)-(earth deformation) system. In the case of simple isostasy the exact solution to this system is known. We demonstrate that the magnitudes of numerical errors made in approximating the ice-earth system are significantly smaller than pairwise differences between several earth models, namely, simple isostasy, the current standard model used in ice sheet simulation (Greve 2001, Hagdorn 2003, Zweck & Huybrechts 2005), and the Lingle & Clark model. Therefore further efforts to validate different earth models used in ice sheet simulations are, not surprisingly, worthwhile.Comment: 36 pages, 16 figures, 3 Matlab program

Long-chain omega-3 PUFAs and their role in healthy ageing

The effects of various fat subtypes can have a profound influence on our health and performance, not only in the early years of life but also as we age. The long-chain omega-3s docosahexaenoic and eicosapentaenoic acid appear to have a positive role in our mental and physical health

Solar Particle Acceleration at Reconnecting 3D Null Points

Context: The strong electric fields associated with magnetic reconnection in solar flares are a plausible mechanism to accelerate populations of high energy, non-thermal particles. One such reconnection scenario occurs at a 3D magnetic null point, where global plasma flows give rise to strong currents in the spine axis or fan plane. Aims: To understand the mechanism of charged particle energy gain in both the external drift region and the diffusion region associated with 3D magnetic reconnection. In doing so we evaluate the efficiency of resistive spine and fan models for particle acceleration, and find possible observables for each. Method: We use a full orbit test particle approach to study proton trajectories within electromagnetic fields that are exact solutions to the steady and incompressible magnetohydrodynamic equations. We study single particle trajectories and find energy spectra from many particle simulations. The scaling properties of the accelerated particles with respect to field and plasma parameters is investigated. Results: For fan reconnection, strong non-uniform electric drift streamlines can accelerate the bulk of the test particles. The highest energy gain is for particles that enter the current sheet, where an increasing "guide field" stabilises particles against ejection. The energy is only limited by the total electric potential energy difference across the fan current sheet. The spine model has both slow external electric drift speed and weak energy gain for particles reaching the current sheet. Conclusions: The electromagnetic fields of fan reconnection can accelerate protons to the high energies observed in solar flares, gaining up to 0.1 GeV for anomalous values of resistivity. However, the spine model, which gave a harder energy spectrum in the ideal case, is not an efficient accelerator after pressure constraints in the resistive model are included.Comment: 15 pages, 14 figures. Submitted to Astronomy and Astrophysic

Valuation of Child Behavioral Problems from the Perspective of US Adults

To assess preferences between child behavioral problems and estimate their value on a quality-adjusted life year (QALYs) scale

Increased risk donor criteria: The time for change is now

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/155965/1/ctr13879.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/155965/2/ctr13879_am.pd

The Iowa Crop Management Database: An Agronomic and Economic Information Recording Tool

The Iowa Crop Management Database (CMD) is designed to record field-by-field agronomic and economic information for crop production in Iowa. Iowa State University Extension is promoting use of such comprehensive records by producers and crop consultants to improve management decisions and farm profitability. Extension staff can use this information and summaries of these records in educational programs, and to document pollution prevention through refined crop management practices. The CMD program is a relational database designed on a model first developed by Pennsylvania State University. The Iowa version was expanded and developed to include a wider range of information resources needed by Iowa producers as a result of a cooperative effort between Extension, state agencies, and agribusiness organizations. The program can meet record-keeping needs for field-by-field agronomic planning, economic analysis, and regulatory documentation. The CMD program is being widely advertised in Iowa by newsletters, direct mailing, brochures displayed at ISU Extension offices, over the World Wide Web and on local radio stations. ISU Extension field specialists with responsibilities for crop production and farm management have been trained in the use of the program. ISU Extension Agribusiness Education is offering a one day short course to train CMD program users. The course will be held on December 10, 1997, January 14 & 21, 1998 and February 11, 1998

Koinonia

In This IssueThe Quest for Moral Integrity, James S. Spiegel The Freshmen Year Experience: A Senior\u27s Perspective, Ryan Hartwig Around CampusRelationship Emphasis Week, Jesse Brown Spotlight on ServiceThe Schuberts: Finding Passion on a Journey of Faith, David Craig Regular FeaturesPresident\u27s Corner Editor\u27s Disk Annual Conference: Memories of the ACSD 2000 at Taylor University Book Review: What Christians Think about Homosexuality ACSD Business: Placement Services ACSD Business: Logo Searchhttps://pillars.taylor.edu/acsd_koinonia/1014/thumbnail.jp

Complete Genomic Sequences of Three Salmonella enterica subsp. enterica Serovar Muenchen Strains from an Orchard in San Joaquin County, California.

We present here the complete genome sequences of three Salmonella enterica subsp. enterica serovar Muenchen strains, LG24, LG25, and LG26. All three strains were isolated from almond drupes grown in an orchard in San Joaquin County, California, in 2016. These genomic sequences are nonidentical and will contribute to our understanding of S. enterica genomics