31544 research outputs found
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Buildings & Grounds
No full textTrees in front of the Auditorium in June 1959.https://digitalcommons.cwu.edu/john_foster_photos/2200/thumbnail.jp
Washington National Bank
No full textInterior view of the Washington National Bank branch, 104 E 4th Ave, Ellensburg, WA, featuring the bank\u27s mural of Ellensburg History by Ernest Ralph Norling in 1956.https://digitalcommons.cwu.edu/john_foster_photos/2116/thumbnail.jp
Aviation Education Workshop
No full textThree people standing by a plane at the aviation education workshop in 1957.https://digitalcommons.cwu.edu/john_foster_photos/2151/thumbnail.jp
Art
No full textThree men looking at pottery in 1955.https://digitalcommons.cwu.edu/john_foster_photos/2058/thumbnail.jp
April 1955 (AP)
No full textThree people looking at a printer in 1955.https://digitalcommons.cwu.edu/john_foster_photos/2083/thumbnail.jp
Aviation Education Workshop
No full textA large group of people outside at the aviation education workshop in 1958.https://digitalcommons.cwu.edu/john_foster_photos/2146/thumbnail.jp
Taylor Roice\u27s COVID Reflections
No full textTaylor Roice talks about his experiences as a student at Central Washington University during the COVID pandemic. He discusses the move to online classes and graduating during the pandemic.https://digitalcommons.cwu.edu/cwu_covid_reflections/1007/thumbnail.jp
Design of broadband Helmholtz resonator arrays using the radiation impedance method
Get PDFThis paper describes the design process of a low-frequency sound absorptive panel composed of differently tuned Helmholtz resonators (HRs), considering size and fabrication constraints relevant for applications in the building sector. The paper focuses on cylindrical and spiral resonators with embedded necks that are thin and can achieve high absorption. the mutual interaction between the resonators was modeled based on the radiation impedance method and it plays a key component in enhancing the absorption performance of the array. The differential evolution search algorithm was used to design the resonators and modify their mutual interaction to derive the absorption performance of multiple HR arrays for comparison. Optimizations to the resonator configuration and the neck resistance were implemented to produce a unit panel that has a broadband absorption performance with emphasis on the low to mid frequencies and is thin and light in weight. Unit panels with dimensions of 20 cm x 20 cm, consisting of 29 cylindrical HRs designed to absorb in the 25–900 Hz frequency range, were constructed and tested in a custom-built impedance tube. The measured absorption performance of these panels is consistent with the theoretical predictions
Searching the Shadows: Thoughts on the West’s Political History An Extended Field Note
No full textThis article compares two works, Greg Grandin’s The End of Myth: From the Frontier to the Border Wall in the Mind of America (2019) and Heather Cox Richardson’s How the South Won the Civil War: Oligarchy, Democracy, and the Continuing Fight for the Soul of America (2020), as a microcosm of the greater field of American political history. In particular, the author focuses on ideologies and platforms that evolved in the American West—particularly Populism and progressivism—that have had an outsized effect on today\u27s political landscape
Black carbon and organic carbon dataset over the Third Pole
Get PDFThe Tibetan Plateau and its surroundings, also known as the Third Pole, play an important role in the global and regional climate and hydrological cycle. Carbonaceous aerosols (CAs), including black carbon (BC) and organic carbon (OC), can directly or indirectly absorb and scatter solar radiation and change the energy balance on the Earth. CAs, along with the other atmospheric pollutants (e.g., mercury), can be frequently transported over long distances into the inland Tibetan Plateau. During the last decades, a coordinated monitoring network and research program named “Atmospheric Pollution and Cryospheric Changes” (APCC) has been gradually set up and continuously operated within the Third Pole regions to investigate the linkage between atmospheric pollutants and cryospheric changes. This paper presents a systematic dataset of BC, OC, water-soluble organic carbon (WSOC), and water-insoluble organic carbon (WIOC) from aerosols (20 stations), glaciers (17 glaciers, including samples from surface snow and ice, snow pits, and 2 ice cores), snow cover (2 stations continuously observed and 138 locations surveyed once), precipitation (6 stations), and lake sediment cores (7 lakes) collected across the Third Pole, based on the APCC program. These data were created based on online (in situ) and laboratory measurements. High-resolution (daily scale) atmospheric-equivalent BC concentrations were obtained by using an Aethalometer (AE-33) in the Mt. Everest (Qomolangma) region, which can provide new insight into the mechanism of BC transportation over the Himalayas. Spatial distributions of BC, OC, WSOC, and WIOC from aerosols, glaciers, snow cover, and precipitation indicated different features among the different regions of the Third Pole, which were mostly influenced by emission sources, transport pathways, and deposition processes. Historical records of BC from ice cores and lake sediment cores revealed the strength of the impacts of human activity since the Industrial Revolution. BC isotopes from glaciers and aerosols identified the relative contributions of biomass and fossil fuel combustion to BC deposition on the Third Pole. Mass absorption cross sections of BC and WSOC from aerosol, glaciers, snow cover, and precipitation samples were also provided. This updated dataset is released to the scientific communities focusing on atmospheric science, cryospheric science, hydrology, climatology, and environmental science. The related datasets are presented in the form of excel files. BC and OC datasets over the Third Pole are available to download from the National Cryosphere Desert Data Center (10.12072/ncdc.NIEER.db0114.2021; Kang and Zhang, 2021)