Rietveld refinement of Sr5(AsO4)3Cl from high-resolution synchrotron data

The apatite-type compound, penta­strontium tris­[arsenate(V)] chloride, Sr5(AsO4)3Cl, has been synthesized by ion exchange at high temperature from a synthetic sample of mimetite [Pb5(AsO4)3Cl] with SrCO3 as a by-product. The results of the Rietveld refinement, based on high resolution synchrotron X-ray powder diffraction data, show that the title compound crystallizes in the same structure as other halogenoapatites with general formula A 5(YO4)3 X (A = divalent cation, Y = penta­valent cation, and X = F, Cl or Br) in the space group P63/m. The structure consists of isolated tetra­hedral AsO4 3− anions (the As atom and two O atoms have m symmetry), separated by two crystallographically independent Sr2+ cations that are located on mirror planes and threefold rotation axes, respectively. One Sr atom is coordinated by nine O atoms and the other by six. The chloride anions (site symmetry ) are at the 2a sites and are located in the channels of the structure

Donors’ influence strategies and beneficiary accountability: an NGO case study

Previous research on NGO accountability have focused on the constraining features of NGOs’ accountability to donors. We argue that donor accountability of NGOs also has enabling features which can be mobilised to the advantage of beneficiaries. Drawing on a fieldwork-based case study design in this paper, we show that how powerful stakeholders like donors can influence NGOs, and in that process facilitate beneficiary accountability. We have found that donors have applied “direct usage” (influence NGOs directly by controlling critical resources) and “indirect usage” (influence NGOs indirectly via other stakeholders such as regulators) strategies in holding the case NGO to account

View-dependent accuracy in body mass judgements of female bodies

A fundamental issue in testing body image perception is how to present the test stimuli. Previous studies have almost exclusively used images of bodies viewed in front-view, but this potentially obscures key visual cues used to judge adiposity reducing the ability to make accurate judgements. A potential solution is to use a three-quarter view, which combines visual cues to body fat that can be observed in front and profile. To test this hypothesis, 20 female observers completed a 2-alternative forced choice paradigm to determine the smallest difference in body fat detectable in female bodies in front, three-quarter, and profile view. There was a significant advantage for three-quarter and profile relative to front-view. Discrimination accuracy is predicted by the saliency of stomach depth, suggesting that this is a key visual cue used to judge body mass. In future, bodies should ideally be presented in three-quarter to accurately assess body size discrimination

The Daily

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising

The Daily

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising

Mineral investigation of the Ragged Top wilderness study area (AZ-020-197), Pima County, Arizona

A United States Bureau of Mines Mineral Land Assessment open-file report. 20 pages (PDF version)

The Daily

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising

Mineral investigation of a part of the Planet Peak wilderness study area (AZ-050-013), La Paz County, Arizona

A U.S. Bureau of Mines Mineral Land Assessment open-file report. 41 pages (PDF version)