1,235 research outputs found
Regional aboveground live carbon losses due to drought-induced tree dieback in pinon-juniper ecosystems
No full textMultiscale analysis of tree cover and aboveground carbon stocks in pinyon-juniper woodlands
No full textRETRACTED – See Author Note - Validation of Crawford’s Postulate: Quantum Collapse Dynamics (v1.51)
No full textUpdated Author Note – May 2025
This paper represents an early attempt to model quantum collapse within the EiG (Energy–information Gradient) framework. While the formulation was internally consistent, I have since identified key flaws in the simulation methodology—particularly in how photon dynamics were represented across discernibility gradients.
As a result, the core conclusion of this manuscript is no longer considered valid. However, the process of developing and testing this model directly led to several foundational insights now informing an updated field theory of light, discernibility, and time—Now available here: https://osf.io/uwn2e
I’ve chosen to leave this paper online as part of an open research process. Future readers should interpret it as an early step in an ongoing effort to model physical reality from first principles under the EiG framework.
— Jason Crawfor
Ionosphere redistribution during strong geomagnetic storms as detected by the CHAMP, SAC-C, TOPEX and Jason-1 satellites
No full textIonosphere response to severe geomagnetic storms that occurred in 2001-2003 was analyzed using data of global ionosphere maps (GIM), altimeter data from the Jason-1 and TOPEX satellites, and data of GPS receivers onboard CHAMP and SAC-C satellites. This allowed us to study in detail ionosphere redistribution due to geomagnetic storms, dayside ionospheric uplift and overall dayside TEC increase. It is shown that after the interplanetary magnetic field turns southward and intensifies, the crests of the equatorial ionization anomaly (EIA) travel poleward and the TEC value within the EIA area increases significantly (up to ～50%). GPS data from the SAC-C satellite show that during the main phase of geomagnetic storms TEC values above the altitude of 715 km are 2-3 times higher than during undisturbed conditions. These effects of dayside ionospheric uplift occur owing to the > and last few hours while the enhanced interplanetary electric field impinged on the magnetopause
Retracted article: Students' learning styles and academic performance in Readings in Philippine History: Basis for a proposed course syllabus enhancement
No full textThe article entitled “Students’ learning styles and academic performance in Readings in Philippine History: Basis for a proposed course syllabus enhancement” (Volume 4, Issue 1, December 2022, pp. 45-51) written by Adrian Ote, Margie M. Lepangge, Nobelen Joy M. Marsonia, Sheena Joy C. Pagran, Jennilyn C. Se, and Jason A. Romero has been retracted at the request of the Corresponding Author
Oregon Commerce and Compliance Division safety action plan, final report
No full textby Jason C. Anderson (Ph.D., Research Associate, Portland State University) and Sal Hernandez (Ph.D., Associate Professor, Oregon State University) and Doug Hedlund (MBA, Hedlund Consulting, LLC) for Oregon Department of Transportation Commerce and Compliance Division.Title from PDF cover (viewed on February 10, 2021).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (page 39).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Molecular C dynamics downstream: The biochemical decomposition sequence and its impact on soil organic matter structure and function
No full textAdvances in spectroscopic and other chemical methods have greatly enhanced our ability to characterize soil organic matter chemistry. As a result, the molecular characteristics of soil C are now known for a range of ecosystems, soil types, and management intensities. Placing this knowledge into a broader ecological and management context is difficult, however, and remains one of the fundamental challenges of soil organic matter research. Here we present a conceptual model of molecular soil C dynamics to stimulate inter-disciplinary research into the ecological implications of molecular C turnover and its management- and process-level controls. Our model describes three properties of soil C dynamics: 1) soil size fractions have unique molecular patterns that reflect varying degrees of biological and physical control over decomposition; 2) there is a common decomposition sequence independent of plant inputs or other ecosystem properties; and 3) molecular decomposition sequences, although consistent, are not uniform and can be altered by processes that accelerate or slow the microbial transformation of specific molecules. The consequences of this model include several key points. First, lignin presents a constraint to decomposition of plant litter and particulate C (\u3e 53 μm) but exerts little influence on more stable mineral-associated soil fractions \u3c 53 μm. Second, carbon stabilized onto mineral fractions has a distinct composition related more to microbially processed organic matter than to plant-related compounds. Third, disturbances, such as N fertilization and tillage, which alter decomposition rates, can have “downstream effects”; that is, a disturbance that directly alters the molecular dynamics of particulate C may have a series of indirect effects on C stabilization in silt and clay fractions
Effects of Soil Texture on Belowground Carbon and Nutrient Storage in a Lowland Amazonian Forest Ecosystem
No full textPlant Community Mediated Responses of Alpine Ecosystems to Anthropogenic Nitrogen Deposition
No full textHuman alteration of the nitrogen (N) cycle has resulted in a rapid increase in the availability of biologically active N. An unintended consequence of increased N availability is increased levels of N deposition into natural landscapes, including alpine ecosystems which are particularly susceptible to adverse environmental impacts. In my dissertation, I have examined alpine plant and soil responses to N deposition 1) across multiple spatial scales throughout the Southern Rocky Mountains, 2) among diverse plant communities associated with unique environmental conditions common in the alpine of this region, and 3) among ecosystem pools of N contributing to stabilization of N inputs within those communities. I used a gradient of N deposition in the southern Rocky Mountains to examine spatial variation in the responses of an alpine moist meadow to gradual changes in N deposition. I developed a response framework of expected ecosystem changes associated with increasing inputs, and found that plant metrics, such as tissue concentrations of nitrogen, were positively correlated with ambient N inputs. Soil biogeochemical responses to N were minimal along the gradient, suggesting that a reduction in N inputs may allow ecosystem recovery if plant feedbacks to N cycling are negligible. I next established a N fertilization study in three common plant communities to compare community responses to simulated N deposition and examined the applicability of the response framework throughout the alpine. I found that communities responded to inputs of N differently for both plant and soil responses, with the dry meadow community showing the strongest effects of N inputs and at the lowest levels of N input while the wet meadow community had few responses contributing to ecosystem change. Finally, I compared the fate of N inputs among ecosystem pools of N within alpine communities receiving elevated N. I found differences in N uptake among the communities, and that uptake increased with elevated N inputs. Even so, ecosystem uptake of N in plant and soil pools was very low (7-11%), supporting the conclusion that the alpine ecosystem does not retain N inputs and that increased N deposition is unlikely to be stabilized in the alpine
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