The American Military Frontiers

by Robert Wooster

2009 · UNM Press

As the fledgling nation looked west to the land beyond the Appalachian Mountains, it turned to the army to advance and defend its national interests. Clashing with Spain, Britain, France, Mexico, the Confederacy, and Indians in this pursuit of expansion, the army's failures and successes alternately delayed and hastened western migration. Roads, river improvements, and railroads, often constructed or facilitated by the army, further solidified the nation's presence as it reached the Pacific Ocean and expanded north and south to the borders of Canada and Mexico. Western military experiences thus illustrate the dual role played by the United States Army in insuring national security and fostering national development. Robert Wooster's study examines the fundamental importance of military affairs to social, economic, and political life throughout the borderlands and western frontiers. Integrating the work of other military historians as well as tapping into a broad array of primary materials, Wooster offers a multifaceted narrative that will shape our understanding of the frontier military experience, its relationship with broader concerns of national politics, and its connection to major themes and events in American history.

Additive Manufacturing of High-Performance Metallic Materials

by Robert Pederson, Joel Andersson, Shrikant Joshi

2023 · Elsevier

Additive Manufacturing of High-Performance Metallic Materials outlines the state-of-the-art on AM in high performance materials utilizing the two most industrially interesting routes of powder bed fusion (PBF) and directed energy deposition (DED). The book delves into Feedstock, Processing, Monitoring and control, Modeling and simulation, and Surface and thermal post-treatments. It specifically addresses materials and the most relevant and high performance applications, namely Ni-based alloys and Titanium alloys, and also provides insights into potential applications through illustrative case studies. With each chapter contributed by experts in the field, this work will serve as a comprehensive resource for graduate students and practitioners alike. - Covers the entire value chain relevant to additive manufacturing spanning feedstock, processing, monitoring, post-treatment, testing and applications - Includes the fundamental understanding of varied associated aspects derived from both extensive experimental knowledge and theoretical investigations - Addresses key materials relevant to varied high performance applications, namely Superalloys and Ni-based alloys

Acclimation of Nitrifiers for Activated Sludge Treatment

by Robert A. Zimmerman, Andrew T. Bradshaw, Don Richard

2004 · IWA Publishing

Nitrification kinetics were evaluated in bench-scale batch reactors fed with a synthetic wastewater containing approximately 1,000 mg ammonia-nitrogen (NH3-N)/L operated at 5, 10, and 20 day solids retention times (SRTs) and with dewatered biosolids supernatant (1,126 to 1,680 mg NH3-N/L) operated at a 20-day SRT. For the 5- and 10-day SRTs, complete nitrification appeared to be inhibited by the presence of un-ionized ammonia and un-ionized nitrous acid. For the 20-day SRT, near complete nitrification was observed for both substrates. Observed ammonium oxidation rates decreased with increasing SRT. Observed yield coefficients were similar for all SRTs and substrates. Fully established steady-state conditions were observed at higher SRTs despite process start-up and operational considerations. Although it may be possible to culture a nitrifier population capable of near-complete nitrification at lower SRTs, the design configuration and operational strategy must mitigate the potential for un-ionized ammonia and un-ionized nitrous acid inhibition (e.g. process start-up at lower concentration with gradual increase to higher concentration, continuous feed operation, etc). Batch bioaugmentation analyses were conducted in the mixed liquor suspended solids and final clarifier effluent from a non-nitrifying activated sludge with seed nitrifiers developed from the 20-day SRT reactors and with biomass from a nitrifying trickling filter facility. Ammonia removal was observed in all bioaugmentation analyses with no apparent lag or acclimation period. Observed ammonium oxidation rates were not significantly different between the seed and batch bioaugmentation reactors. Acclimation does not appear to be a critical obstacle for nitrifier bioaugmentation when environmental conditions (e.g. temperature, pH, etc.) between the seed and bioaugmentation processes are not significantly different.

Yellowstone Jack

by Robert V. Goss

2025 · Simon and Schuster

Jack Baronett (1829–1906) was an important figure in the history of Yellowstone National Park. In his early life he traveled the world, prospecting and mining in Australia, Africa, China, and Alaska. He traveled to the Yellowstone region in 1864—eight years before the Park was established—to join other early prospectors searching for gold and exploring the geyer basins. His first claim to fame came in 1869 when he and a partner rescued Truman Everts, a lost, near-death member of the Washburn Yellowstone expedition. After 1872 he served as early assistant superintendent in Yellowstone, a scout for the US Army, and one of the founders of Cooke City, MT. As a notable guide in the park, his patrons included Generals Sherman, Sheridan and Strong, President Chester Arthur, George Bird Grinnell, and Wiliam Henry Jackson. They all used Baronett’s Bridge, the first bridge built over the Yellowstone River in 1871. In 1875 Baronett was deputized as a US Marshall, making him the first federal law enforcement officer in the park. He chased horse thieves and protected the area from poachers and outlaws. Historians have dubbed Baronett prospector miner, explorer, adventurer, soldier of fortune, scout, hunter, guide, and Indian fighter—all monikers befitting his adventurous wanderlust life. Despite all these wanderings, he eventually discovered what would be his true home—southwest Montana and Yellowstone National Park.