Boise State University

About: Boise State University is a education organization based out in Boise, Idaho, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 3698 authors who have published 8664 publications receiving 210163 citations. The organization is also known as: BSU & Boise State.

Geochemical Zoning in Metamorphic Minerals

Abstract: Geochemical zoning of major and trace elements, as well as stable and radiogenic isotopes in metamorphic minerals, is reviewed, emphasizing theoretical models of compositional zoning and classic or particularly illustrative examples from the literature. Chemical and isotopic implications of Rayleigh distillation, equilibrium partitioning and growth zoning, diffusion, kinetic limitations within the rock matrix, and dissolution–reprecipitation are explored. Implications for geospeedometry and thermobarometry are also developed. Major elements and stable isotopes commonly conform well to equilibrium models of crystal growth and diffusional reequilibration during cooling, but trace elements and by extension radiogenic isotopes are strongly affected by reactions involving accessory minerals and kinetic limitations.

Phase transitions, phase coexistence, and piezoelectric switching behavior in highly strained BiFeO(3) films.

Abstract: Highly strained BiFeO3 films transition into a true tetragonal state at 430 °C but remain polar to much higher temperatures (∼800 °C). Piezoelectric switching is only possible up to 300 °C, i.e., at temperatures for which strain stabilizes the stripe-like coexistence of multiple polymorphs.

Do geochemical estimates of sediment focusing pass the sediment test in the equatorial Pacific

Abstract: [1] The paleoceanographic recording fidelity of pelagic sediments is limited by chemical diagenesis and physical mixing (bioturbation and horizontal sediment transport) Diagenesis and bioturbation are relatively well-studied, but the effects of physical sedimentation have been largely ignored Modeling U series isotopes (eg, 230Th) can potentially quantify horizontal sediment movement, but model horizontal sediment focusing often equals or exceeds the vertical particle rain We find no evidence of this level of sediment focusing in the equatorial Pacific from geophysical data or sediment core comparisons The overestimate of sediment focusing by 230Th is probably caused by poor model assumptions: that sediment does not fractionate (does not sort according to size during transport) and that 230Th cannot leak from slowly accumulating sediments Both assumptions are weak U series methods do hold promise to quantify sediment focusing if properly calibrated With calibration the trade-offs between seeking high sedimentation rates for better time resolution and the blurring by horizontal sediment focusing can be better assessed

Clawpack: Building an open source ecosystem for solving hyperbolic PDEs

Abstract: Funding sources that have contributed to the developments outlined in this paper include: NSF grants DMS-1216732, DMS-1419108, and EAR-1331412, DOE Office of Advanced Scientific Computing grant DE-FG02-88ER25053, KAUST OCRF grant 2156 CRG3, and the University of Washington Department of Applied Mathematics. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Student Attitudes Toward and Recall of Outside Day: An Environmental Science Field Trip

Abstract: Field trips are effective because they situate learning and facilitate knowledge transfer, thereby influencing students learning attitudes, interests, and motivation. Variations in field trip configurations and the subsequent affective and cognitive influences provided the motivation for this study of Outside Day—an environmental education field trip for 6th-grade students. The participants were immediately postassessed on their attitudes toward the event and 1 month later assessed on their event activity recall. Results indicate the students held positive attitudes toward the field trip and recalled a hands-on orienteering activity most frequently. The discussion provides explanations and implications of findings.