Documenting Disasters: A Focus on Floods

A more thorough understanding of disasters can help archivists assemble and acquire collections of depth that will be of wide use to scholars, survivors, and others. To investigate the broader context of disasters, the focus of this article is on natural disasters, looking at floods in particular, with the hope that the information can be applied to other tragedies. The article includes an in-depth examination of disaster studies literature of assistance to archivists, along with accounts of experiences working with flood collections

"The beginning of everything": a five-year report on the Colorado State University Water Resources Archive

Includes bibliographical references (pages 13-17)

Tracing the Source of Irrigation: An Examination of Colorado Ditch Company Collections in Archival Repositories

The history of irrigation is significant in the western United States, which has now experienced over 150 years of irrigation development. When considered fully, the history of Western irrigation goes beyond agriculture and extends to engineering, economics, business, sociology, law, politics, ecology, and more. The historical understanding to be gained from any of these viewpoints depends on the preservation and accessibility of original records created by irrigators. In the West, ditch company records are the earliest and best source of irrigation history. This article examines to what extent historical records of Colorado ditch companies have been preserved in and made accessible through public archival repositories. It also contextualizes ditch companies and their records and makes recommendations so such records can be available for a variety of research

Electron-phonon coupling in 122 Fe pnictides analyzed by femtosecond time-resolved photoemission

Based on results from femtosecond time-resolved photoemission, we compare three different methods for determination of the electron-phonon coupling constant {\lambda} in Eu and Ba-based 122 FeAs compounds. We find good agreement between all three methods, which reveal a small {\lambda} < 0.2. This makes simple electron-phonon mediated superconductivity unlikely in these compounds.Comment: 11 pages, 3 figure

Colorado water history: a bibliography

March 2008.Water is at the heart of Colorado's past and future. Ongoing debates - even lawsuits - regarding water show the importance this vital resource to the state and to the West. Combined with natural disasters such as floods and drought, or human concerns such as pollution and recreation, water issues have drawn an increasing degree of public attention. For water professionals, students, and interested citizens, knowing the history of our water resources can lead to a better understanding of current issues and events. The Colorado Water History Bibliography is a helpful resource for those wanting to learn more about this timely and significant topic. This bibliography is not intended to be comprehensive. Rather, it is a selective listing of core books on the topic that are generally accessible to the public, both in terms of content and availability. In addition to illuminating books already written about Colorado's water, this list reveals areas ripe for research. There are clearly holes in the writings about our state's rich water history, waiting to be filled in by generations of scholars yet to come

Momentum dependent ultrafast electron dynamics in antiferromagnetic EuFe2As2

Employing the momentum-sensitivity of time- and angle-resolved photoemission spectroscopy we demonstrate the analysis of ultrafast single- and many-particle dynamics in antiferromagnetic EuFe2As2. Their separation is based on a temperature-dependent difference of photo-excited hole and electron relaxation times probing the single particle band and the spin density wave gap, respectively. Reformation of the magnetic order occurs at 800 fs, which is four times slower compared to electron-phonon equilibration due to a smaller spin-dependent relaxation phase space

Integrated aircraft scheduling problem: An auto-adapting algorithm to find robust aircraft assignments for large flight plans

The overall airline scheduling process involves hierarchical steps starting with the network design and ending with crew assignment. Aircraft routing is especially important with respect to timing and costs for an airline. In this contribution, we focus on aircraft routing where aircraft are assigned to flight legs further considering maintenance requirements. We developed and implemented algorithms that extend the aircraft routing problem (ARP) by including profit and robustness. The latter objective is important as the dependencies of flights and airlines increases and deviations to the original time plan as unexpected events like volcano eruptions or heavy weather-related issues are difficult to handle. A robust aircraft routing ensures that unforeseen events have less impact. The results are compared to current state-of-the-art solutions. We developed a test instance-generator to create specific problems and build a library for future benchmarking tests

A New View on Density Corrected DFT: Can One Get a Better Answer for a Good Reason?

Despite its widespread use, density functional theory (DFT) has several notable areas of failure; perhaps the most well-studied of these failures is self-interaction error (SIE). Density corrected DFT (DC-DFT) was proposed as a potential solution to systems where SIE causes traditional DFT to fail. The Hartree-Fock (HF) density is then used for cases where the DFT energy is suitable but the self-consistent density is erroneous. In this study, we investigate the utility of the higher quality orbital optimized MP2 densities in DC-DFT for barrier heights and halogen bonded complexes. For functionals such as PBE and r$^2$SCAN, find that these densities yield worse results than the HF density due to favorable cancellation between the density-driven and functional-driven errors, confirming a recent study. Error decomposition reveals functional driven error, not density driven error, to be the primary cause of inaccuracy in DFT calculations where SIE is prominent. We therefore advise caution when using HF-DFT, because the only rigorous way to remove large functional-driven errors in lower rungs of Jacob's ladder is by climbing to higher rungs that include exact exchange. We recommend that better functionals be improved by using a better density in SIE-sensitive cases. Examples support the value of this variant of DC-DFT. We also emphasize that DC-DFT potential energy surfaces have first derivative discontinuities at Coulson-Fischer points, in contrast to the second derivative discontinuities in SCF solutions