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Articles 1 - 10 of 10
Full-Text Articles in Physical Sciences and Mathematics
Serendipitous Synthesis Of Cross-Conjugated Dienes By Cascade Deconstructive Esterification Of Thiomorpholinone-Tethered Alkenoic Acids, Abdikani Omar Farah, Jorge Garcia, Claire Borg, Timothy K. Beng
Serendipitous Synthesis Of Cross-Conjugated Dienes By Cascade Deconstructive Esterification Of Thiomorpholinone-Tethered Alkenoic Acids, Abdikani Omar Farah, Jorge Garcia, Claire Borg, Timothy K. Beng
Student Published Works
Functionalized 1,3-dienes are ubiquitous structural motifs in biologically pertinent molecules. They are frequently employed as precursors for a broad range of chemical transformations, including Diels-Alder reactions. The stereoselective construction of highly decorated 1,3-dienes therefore represents an important research objective. Medicinal chemists are becoming increasingly interested in synthetic methodologies that not only achieve expedient construction and peripheral editing of heterocycles, but also seek to modify their core framework in order to achieve skeletal remodeling. In a succinct manifestation of this 'scaffold hopping' concept, we herein describe a cascade reaction, which converts thiomorpholinone-tethered alkenoic acids to 1,1-disubstituted amino-1,3-dienes. This domino process involves …
Monitoring Whitebark Pine Stand Health In The Central Washington Cascades, Nancy H. Parra, Teresa J. Lorenz, Taza D. Schaming, Alison Scoville
Monitoring Whitebark Pine Stand Health In The Central Washington Cascades, Nancy H. Parra, Teresa J. Lorenz, Taza D. Schaming, Alison Scoville
Student Published Works
Whitebark pine (Pinus albicaulis) plays a vital role in colonizing newly disturbed areas, providing shade for other tree species to germinate, and supplying food for a variety of birds and mammals, such as Clark’s Nutcrackers (Nucifraga columbiana) and grizzly bears (Ursus arctos horribilis). Decline of whitebark pine populations has been attributed to several factors, including white pine blister rust (Cronartium ribicola), mountain pine beetle (Dendroctonus ponderosae) outbreaks, and fire exclusion. In 2009, the U.S. Forest Service began to install permanent plots in whitebark pine stands in Washington and Oregon as …
Leveraging The 1,3-Azadiene-Anhydride Reaction For The Synthesis Of Functionalized Piperidines Bearing Up To Five Contiguous Stereocenters, Jorge Garcia, Jane Eichwald, Jayme Zesiger, Timothy K. Beng
Leveraging The 1,3-Azadiene-Anhydride Reaction For The Synthesis Of Functionalized Piperidines Bearing Up To Five Contiguous Stereocenters, Jorge Garcia, Jane Eichwald, Jayme Zesiger, Timothy K. Beng
Student Published Works
A modular and scalable strategy, which remodels 3-methylglutaric anhydride to 2-oxopiperidines bearing at least three contiguous stereocenters is described. The approach relies on the chemoselective and stereocontrolled annulation of 1,3-azadienes with the anhydride component. The resulting acid-tethered allylic 2-oxopiperidines are then engaged in several selective fragment growth processes, including catalytic denitrative alkenylation, halolactonization, and Vilsmeier–Haack functionalization.
Energy Optimization In Multi-Uav-Assisted Edge Data Collection System, Bin Xu, Lu Zhang, Zipeng Xu, Yichuan Liu, Jinming Chai, Sichong Qin, Yanfei Sun
Energy Optimization In Multi-Uav-Assisted Edge Data Collection System, Bin Xu, Lu Zhang, Zipeng Xu, Yichuan Liu, Jinming Chai, Sichong Qin, Yanfei Sun
Student Published Works
In the IoT (Internet of Things) system, the introduction of UAV (Unmanned Aerial Vehicle) as a new data collection platform can solve the problem that IoT devices are unable to transmit data over long distances due to the limitation of their battery energy. However, the unreasonable distribution of UAVs will still lead to the problem of the high total energy consumption of the system. In this work, to deal with the problem, a deployment model of a mobile edge computing (MEC) system based on multi-UAV is proposed. The goal of the model is to minimize the energy consumption of the …
Incorporating Universal Design Into Tsunami Modeling Results For Cascadia Subduction Zone Faults To Create An Inundation Map And Universally Designed Evacuation Map For Port Angeles, Wa, Hannah Rose Spero, Breanyn Macinnes, Naomi J. Petersen
Incorporating Universal Design Into Tsunami Modeling Results For Cascadia Subduction Zone Faults To Create An Inundation Map And Universally Designed Evacuation Map For Port Angeles, Wa, Hannah Rose Spero, Breanyn Macinnes, Naomi J. Petersen
Student Published Works
Current tsunami hazard inundation and evacuation maps in the Puget Sound are based primarily on Cascadia and Seattle fault tsunamis. The standard evaluation process for tsunami impacts focuses on elevation and hypothetical fault rupture of known and predicted earthquakes. However, there are several known tsunami deposits in the Puget Sound that are not from Cascadia or Seattle fault tsunamis, potentially from other faults within the region, that could affect tsunami mitigation. Work to understand newly discovered crustal deformation and faults in Puget Sound is ongoing, therefore evacuation and inundation maps need to be updated to include these new faults and …
Tibetan Plateau Geladaindong Black Carbon Ice Core Record (1843–1982): Recent Increases Due To Higher Emissions And Lower Snow Accumulation, Matthew Jenkins, Susan Kaspari, Kang Shi-Chang, Bjorn Grigholm, Paul A. Mayewski
Tibetan Plateau Geladaindong Black Carbon Ice Core Record (1843–1982): Recent Increases Due To Higher Emissions And Lower Snow Accumulation, Matthew Jenkins, Susan Kaspari, Kang Shi-Chang, Bjorn Grigholm, Paul A. Mayewski
Student Published Works
Black carbon (BC) deposited on snow and glacier surfaces can reduce albedo and lead to accelerated melt. An ice core recovered from Guoqu glacier on Mt. Geladaindong and analyzed using a Single Particle Soot Photometer (SP2) provides the first long-term (1843–1982) record of BC from the central Tibetan Plateau. Post 1940 the record is characterized by an increased occurrence of years with above average BC, and the highest BC values of the record. The BC increase in recent decades is likely caused by a combination of increased emissions from regional BC sources, and a reduction in snow accumulation. Guoqu glacier …
Detection Of Radioactive Isotopes From The Fukushima Daiichi Nuclear Power Plant In The Kittitas Valley Of Washington State, Randle Affholter, Michael Braunstein, Cesar Mendoza, Anne Johansen
Detection Of Radioactive Isotopes From The Fukushima Daiichi Nuclear Power Plant In The Kittitas Valley Of Washington State, Randle Affholter, Michael Braunstein, Cesar Mendoza, Anne Johansen
Student Published Works
Following the Fukushima Daiichi nuclear power plant disaster in March, 2011, various radioactive isotopes were emitted from the plant [Ewing, 2011]. We hypothesized that emissions would bind to particulate matter, which then could be dispersed by wind currents and deposited across the planet. We analyzed an aerosol sample collected with a high volume cascade impactor in the Kittitas Valley of Washington state. NaI(Tl) gamma spectrometry revealed the presence of the isotopes 132Te and 131I, consistent with the type of nuclear accident at Fukushima Daiichi.
Geochemical Analysis Of Surface And Ground Waters Around Cle Elum, Wa; Implications For The Proposed Exempt Well Moratorium, David Hickey, Ryan Opitz, Carey A. Gazis
Geochemical Analysis Of Surface And Ground Waters Around Cle Elum, Wa; Implications For The Proposed Exempt Well Moratorium, David Hickey, Ryan Opitz, Carey A. Gazis
Student Published Works
The Yakima River drainage is one of the most heavily irrigated regions in the state, and water use has been much contested and litigated. Due to this water demand and the increase in drilling of domestic wells, a moratorium on exempt well drilling was proposed in 2007. In this study geochemical data is used to evaluate the surface-groundwater interaction in the area around Cle Elum, WA. The hydrogeology of this area is poorly understood due to the complex stratigraphy where the valley floor meets the bedrock of the Cascade Range. It is important to understand the relationship between groundwater and …
Conservation And Restoration Of Pine Forest Genetic Resources In México, C. Sáenz-Romero, Amy E. Snively, R. Lindig-Cisneros
Conservation And Restoration Of Pine Forest Genetic Resources In México, C. Sáenz-Romero, Amy E. Snively, R. Lindig-Cisneros
Student Published Works
Deforestation rates in México are about 670,000 ha/year. This threatens the richness of forest genetic resources in México, causing the disappearance of locally adapted populations and rare and endangered pine species. México is one of the six megadiverse countries in the world, with half of the world’s Pinus species. Pinus is one of the most economically and ecologically important forest genera in México. We suggest that delineation of seed zones and the establishment of a network of Forest Genetic Resource Conservation Units (FGRCUs), linked with forest management and ecological restoration programs will protect this valuable resource. We estimate that FGRCUs …
Holocene Paleoflood Hydrology Of The Lower Deschutes River, Oregon, Kurt J. Hosman, Lisa L. Ely, Jim E. O'Connor
Holocene Paleoflood Hydrology Of The Lower Deschutes River, Oregon, Kurt J. Hosman, Lisa L. Ely, Jim E. O'Connor
Student Published Works
Flood deposits at four sites along the lower Deschutes River, Oregon, were analyzed to determine magnitude and frequency of late Holocene flooding. Deposit stratigraphy was combined with hydraulic modeling at two sites to determine ranges of likely discharges for individual deposits. Combining these results with gaged flood data provides improved flood frequency estimates at the Axford site. The completeness and age spans of preserved flood chronologies differed among the four sites, but results were consistent for the largest floods of the last 5000 years. Single floods exceeded 2860-3800 mVs -4600 cal yr BP, 1060-1810 mVs -1300 cal yr BP, and …