14,929 research outputs found
Is There a Doctor \u27in the Suite\u27? Nurse Practitioners\u27 Services and a Reimbursement Dilemma
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Pipe Poiseuille flow of viscously anisotropic, partially molten rock
Laboratory experiments in which synthetic, partially molten rock is subjected
to forced deformation provide a context for testing hypotheses about the
dynamics and rheology of the mantle. Here our hypothesis is that the aggregate
viscosity of partially molten mantle is anisotropic, and that this anisotropy
arises from deviatoric stresses in the rock matrix. We formulate a model of
pipe Poiseuille flow based on theory by Takei and Holtzman [2009a] and Takei
and Katz [2013]. Pipe Poiseuille is a configuration that is accessible to
laboratory experimentation but for which there are no published results. We
analyse the model system through linearised analysis and numerical simulations.
This analysis predicts two modes of melt segregation: migration of melt from
the centre of the pipe toward the wall and localisation of melt into
high-porosity bands that emerge near the wall, at a low angle to the shear
plane. We compare our results to those of Takei and Katz [2013] for plane
Poiseuille flow; we also describe a new approximation of radially varying
anisotropy that improves the self-consistency of models over those of Takei and
Katz [2013]. This study provides a set of baseline, quantitative predictions to
compare with future laboratory experiments on forced pipe Poiseuille flow of
partially molten mantle.Comment: 23 pages, 7 figures. Submitted to Geophysical Journal International
on 25 April 2014. Revised after reviewer comments and resubmitted on 20
August 201
A study to determine similarities and variances among medical-surgical nursing instructors in rating selected science principles underlying the nursing care of a patient with an ileostomy
Thesis (M.S.)--Boston Universit
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An Overview of the Nonprofit and Charitable Sector
[Excerpt] A number of policy issues have direct or indirect consequences for the nonprofit and charitable sector, including the establishment of a social innovation initiative, changes in the tax treatment of charitable donations, responses to the economic downturn, and health care reform. The nonprofit and charitable sector represents a significant portion of the U.S. economy. The sector is also highly diverse. Having a greater understanding of the nonprofit and charitable sector as a whole may help policymakers evaluate proposals that may impact the sector.
The first section of this report provides a formal definition of the nonprofit and charitable sector. The term “nonprofit sector” is generally intended to refer to organizations with federal tax-exempt status; “charitable sector” refers to the subset of these organizations that have 501(c)(3) public charity status.
The next section reports on the size and scope of the charitable sector. Charitable organizations are estimated to employ more than 7% of the U.S. workforce, while the broader nonprofit sector is estimated to employ 10% of the U.S. workforce. In 2009, the charities filing Form 990 with the Internal Revenue Service reported approximately 2.6 billion in assets. Nonprofit institutions serving households (largely charities) constituted more than 5% of GDP in 2008.
The third section of this report examines how charities are funded. Revenue comes from a variety of sources, including private contributions, payments (fees for service), government grants, and investment income. Revenue sources vary significantly across different types of charities: charities involved in health care (including nonprofit hospitals) and educational institutions rely heavily on private payments while arts, culture, and humanities charities and environment and animals charities are more reliant on private contributions. Private contributions to charities are of particular interest as charitable giving may respond to changes in the tax code. As the recent economic downturn has increased the demand for goods and services provided by a number of charities, the impact of the business cycle on funding is also discussed.
The fourth section provides an overview of the charitable sector’s relationship with government. From a theoretical perspective, economics suggests that the government should subsidize activities that are either public goods or have positive external effects. It can be argued that some charitable activities possess these qualities. The costs to the government of providing grants, allowing charitable contributions to be tax deductible, exempting investment income of charities from tax, and providing property and sales tax exemptions are presented. The oversight role of the government is also reviewed.
Finally, the report concludes with policy considerations. This section opens by surveying what policy options are considered most important by charitable organizations themselves. Building on this, a number of policy options are examined, including (1) increasing government grants and subsidies to charitable organizations; (2) creating an oversight agency within the federal government to gather data, conduct research, and advocate for the charitable sector; (3) implementing policies designed to help charities and foundations in economic downturns; (4) changing the itemized deduction for charitable contributions by limiting, converting to a credit, or making the deduction more widely available; and (5) a variety of other tax issues
Attack of \u3ci\u3eUrophora Quadrifasciata\u3c/i\u3e (Meig.) (Diiptera: Tephritidae) A Biological Control Agent for Spotted Knapweed (\u3ci\u3eCentaurea Maculosa\u3c/i\u3e Lamarck) and Diffuse Knapweed (\u3ci\u3eC. Diffusa\u3c/i\u3e Lamarck) (Asteraceae) by a Parasitoid, \u3ci\u3ePteromalus\u3c/i\u3e Sp. (Hymenoptera: Pteromalidae) in Michigan
Urophora quadrifasciata (Meig.) a seedhead fly released in North America for biological control of Centaurea maculosa and C. diffusa is parasitized by a Pteromalus sp. Parasitism up to 60% of U. quadrifasciata was found in samples of seed heads of C. maculosa and C. diffusa collected from 54 of the 59 counties sampled in Michigan and in one sample of C. maculosa seed heads from Hennepin County, Minnesota. Parasitism of U. quadrifasciata has rarely been reported
Mode-matching without root-finding: Application to a dissipative silencer
This article presents an analytic mode-matching approach suitable for modelling the propagation of sound in a two-dimensional, three-part, ducting system. The approach avoids the need to the find roots of the characteristic equation for the middle section of the duct (the component) and is readily applicable to a broad class of problems. It is demonstrated that the system of equations, derived via analytic mode-matching, exhibits certain features which ensure that they can be re-cast into a form that is independent of the roots of the characteristic equation for the component. The precise details of the component are irrelevant to the procedure; it is required only that there exists an orthogonality relation, or similar, for the eigenmodes corresponding to the propagating wave-forms in this region. The method is applied here to a simple problem involving acoustic transmission through a dissipative silencer of the type commonly found in heating ventilation and air-conditioning (HVAC) ducts. With reference to this example, the silencer transmission loss is computed, and the power balance for the silencer is investigated and is shown to be an identity that is necessarily satisfied by the system of equations, regardless of the level of truncation
Analysis of whisker-toughened ceramic components: A design engineer's viewpoint
The use of ceramics components in gas turbines, cutting tools, and heat exchangers has been limited by the relatively low flaw tolerance of monolithic ceramics. The development of whisker toughened ceramic composites offers the potential for considerable improvement in fracture toughness as well as strength. However, the variability of strength is still too high for the application of deterministic design approaches. Several phenomenological reliability theories proposed for this material system are reviewed and the development is reported of a public domain computer algorithm. This algorithm, when coupled with a general purpose finite element program, predicts the fast fracture reliability of a structural component under multiaxial loading conditions
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Replacement of dichloromethane within chromatographic purification : a guide to alternative solvents
Replacement of dichloromethane as the bulk medium within chromatographic purification has been evaluated with a broad range of molecules containing functionality common within Medicinal Chemistry programmes. Analysis of the data set has generated a set of general guidelines to assist in the selection of alternative solvents for CH2Cl2 as the bulk media in these ubiquitously employed processes
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