31544 research outputs found
Sort by
DEMOGRAPHY AND HABITAT ASSOCIATIONS OF THE BASALT CACTUS: PEDIOCACTUS NIGRISPINUS
No full textCacti are iconic, conspicuous, and important contributors to arid ecosystems. They stabilize soil and provide essential food and habitat to wildlife. Pediocactus nigrispinus is a species of cactus endemic to the Pacific Northwest and has been listed as a sensitive species due to its vulnerability to habitat loss. Pediocactus nigrispinus is being threatened by habitat fragmentation, poaching, and a changing climate. Best conservation methods for this species are poorly understood, due in part to a limited understanding of its demography and associations that may help define its occurrence.
A demographic study in Washington State was implemented in 2016 to give a baseline understanding of the population dynamics for P. nigrispinus. Five years of size, fecundity, and survival information were recorded. A stochastic analysis was performed to assess survival and fecundity rates for climatic variables. Biotic and abiotic associations were assessed in an additional 16 plots throughout Washington and Oregon through in situ assessment of vegetation and ground cover associations. These variables were compared with population density, overall size of the individuals, and number of fruits to assess how changes in associations may correlate with changes in these population traits. The demography study found no juvenile recruitment and a declining population over the four years of analysis regardless of annual precipitation levels. The association analysis found no correlation in population metrics with the associations but indicated higher fruit production in Oregon compared to Washington
Paleoseismic Investigation of Rupture on the Dead Coyote Fault in the Kittitas Valley, Washington
Get PDFRecently discovered fault scarps along the Dead Coyote Fault (DCF) in the northern Kittitas Valley (KV) of central Washington suggests active faulting in the late Quaternary, but constraints on the timing and potential magnitude of earthquakes along the fault zone are limited. The KV lies at the northwestern edge of the Yakima Fold and Thrust Belt (YFTB), a low-strain region where individual structures are capable of producing M~7 earthquakes.
This investigation uses surficial geologic mapping and topographic analysis of the DCF scarps, ground penetrating radar transects, and paleoseismic trenching to determine the rupture history of the DCF. The trench was excavated across a 30-cm-high scarp in an alluvial fan surface and exposed two shallow, north-dipping, thrust fault zones within a silicic caliche. My interpretation suggests the DCF has had two major ruptures since the mid-Pleistocene based on mapped stratigraphic and structural relationships. Within the trench, measurements of correlated units across both fault zones indicate 72–76 cm of cumulative vertical separation, with the most recent rupture accounting for 36 – 45% of the total vertical separation.
Topographic profiles across the DCF scarps suggest that a greater amount of slip was accommodated along the western portion of the DCF and the estimated minimum surface rupture length of the most-recent rupture is 27.3 – 28.3 km suggesting a moment magnitude between Mw 6.5 - 6.7
JCATI Carbon Fiber Recycler: Gearing and Shredding
Get PDFThe purpose of this project is to build and improve on the carbon-fiber recycler at Central Washington University. The carbon-fiber recycler consists of four components such as a crusher, shredder, conveyor, and oven. This report will focus on the shredding and gearing elements. The chain drive on the shredder and the gearing module were replaced with a synchronous belt drive.
The pitch diameters for the sprockets on the shredder and the center distance of the shafts was evaluated to find the belt length. The velocity ratio and the angular velocity was used to find the minimum torque on the shaft. Lastly, the torque and pitch diameter were used to calculate the force on the belt. The center-to-center distance for the shafts between shredder and motor was reduced from 30.44 inches to 25.5 inches by manufacturing 4 in. x 7 in. x 2 in. spacers. The motor for the gearing component was moved downward an inch. The linear velocity ratio for the sprockets on the gearing device was changed from a 2.54:1 ratio to a 3:1 ratio to minimize the number of RPMs. A sound meter was used to measure the sound of the machine and a tachometer was used to measure the rotational speed. The intent to change the chain drive to a synchronous belt drive is to reduce the sound of the machine.
The sound of the machine was reduced by 50% when operating. The gearing portion achieved a minimum of 1000 RPMs when in operation
F-1/10th
Get PDFTeam members Nate and Max were tasked with designing, building, and testing an RC controlled vehicle to complete in a competition. This competition consists of an off-road course, on road course, and an obstacle course. The team set out to win this competition by creating a more than capable vehicle for the competition. This engineering report will cover Max’s contributions to the project.
The team was split into two roles. Max taking on steering and suspension, Nate taking on drivetrain and chassis. Each team member took responsibility for the design and construction of those systems. The design chosen was based off a real-life trophy truck. The team’s goal was to make the remote-controlled vehicle as close as possible to the real truck. Requirements were set individually as a baseline for success of the project. The team used their requirements to determine how the truck as designed. Additionally, the requirements drove what materials parts would be constructed of. Max used real word parts to model the appearance of parts and backed the parts with analysis. Analysis was done on twelve large parts to ensure the parts would hold up to the testing and competition.
The testing of the vehicle and the competition were both used to determine the success of the project. The truck meeting all its requirements and doing well in the competition being successful
Ron Olney
No full textRon Olney Basketball Player 1962https://digitalcommons.cwu.edu/john_foster_photos/4129/thumbnail.jp
Ron Schriber
No full textRon Schriber Basketball Player 1962https://digitalcommons.cwu.edu/john_foster_photos/4133/thumbnail.jp
Annual Reception Lewis County Students 1962
No full textA group photo of the Annual Reception of Lewis County Students, 1962.https://digitalcommons.cwu.edu/john_foster_photos/4134/thumbnail.jp
Annual Reception Lewis County Students 1962
No full textA group photo of the Annual Reception of Lewis County Students, 1962.https://digitalcommons.cwu.edu/john_foster_photos/4136/thumbnail.jp
Trent Jonas
No full textTrent Jonas, John Galbruith- Swimming 1963https://digitalcommons.cwu.edu/john_foster_photos/4139/thumbnail.jp
Homecoming Parade 1962
No full textA homecoming parade float for Montgomery Hall[?] in downtown Ellensburg, 1962.
Note: This image is a product of its time and may be seen as racist or culturally insensitive by today\u27s standards.https://digitalcommons.cwu.edu/john_foster_photos/4102/thumbnail.jp