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Fabrication of Alumina Membranes From Uv Resin– Alumina Particle Slurries
Get PDFCeramics membranes are made in a wide variety of different techniques using a wide variety of different materials. However, many of the common techniques utilize a slurry of ceramic particles, additives, and either organic solvent or water that is shaped into a membrane, left to dry, and then sintered together. Drying is a time consuming process, often requiring several hours for the liquid medium to evaporate. Defect formation caused by development of partial pressures across the drying membrane, including cracks and warpage, also typically occurs during the drying process. To address this, slurries of ceramic particles made with a low viscosity UV-curable resin, which can cure in the span of a few seconds, eliminating the need for drying and any defects associated with drying. Slurries were made with different particle sizes and volume fractions and made into thin membranes using an Autodesk Ember 3D printer. Curing of UV resin and slurries were examined with FTIR. Pyrolytic behavior of resin was examined using isothermal TGA. Cure depth profiles were determined using the modified Beer-Lambert Law and compared against models in literature. Results showed contrasting curing behavior based on volume fraction and particle size due to differences in UV light exposure methods
A Happy Lie
Get PDFI recently went to a zoo. Wild animals living in confinement with one single purpose: to entertain. When contemplating the concept of a zoo it will become surreal, I promise
Skip the Grid: Solar System Installations in the Navajo Nation
Get PDFSkip the Grid is an interdisciplinary project that involves installing solar energy systems in the Navajo Nation. The project’s mission was to support the Navajo families, specifically the students that have limited access to light which directly affects their education. On March 26, 2023, a team of 20 California Polytechnic State University San Luis Obispo (Cal Poly) students, across eight different majors, travelled to Arizona to collaborate with the Red Mesa and Chinle Unified School Districts to install “off-grid” solar energy systems and lights. Through this project the Cal Poly students learned about the people of Navajo Nation, solar energy, and the importance of interdisciplinary learning. Skip the Grid is now two years running and is continuing to evolve and excel not only to support the people of Navajo, but also for Cal Poly students to exercise Cal Poly’s core philosophy, “Learn by Doing
AS-957-23 Resolution on the General Faculty Status of Part Time Lecturers
Get PDFSends to the full faculty for a vote in Spring 2023 a revision of the Constitution in Article III, Section 1, part 11 (c), which proposes expanding the number of part time lecturer representatives serving on Academic Senate
Coupled Boundary Conditions for Modeling Airbreathing Engines
Get PDFModeling the flight conditions of an aircraft that utilizes an airbreathing propulsion system necessitates a method to account for the increase in energy introduced into the flow. Current methods for modeling engines either assign fixed conditions on flat faces on the intake and exhaust through a manual process with the use of external models or attempt to model the flow through the engine within the simulation using complex and computationally expensive geometry and solvers. The method presented attempts to provide an intermediate option to model airbreathing engines through coupling the intake and exhaust boundary conditions with a parametric engine model. This enables the intake conditions within the finite volume simulation to assign the exhaust boundary conditions as the solution iterates, allowing for engines to be dynamically simulated in transient cases and for continuity in the simulation to be better maintained. This method of modeling airbreathing engines could also prove useful in nacelle optimization studies and in modeling aircraft with long engine intakes. The NASA Common Research Model and an axisymmetric nacelle geometry are used to demonstrate the functionality of the developed coupled engine model and its implementation in a finite volume solver
AS-964-23 Resolution on In-Residence Requirement for Last 30 Units for Quarter-to-Semester Conversion
Get PDFResolves that 18 of the last 30 semester-units required for the degree must be taken in residence; and that colleges will separately determine the extent to which they wish to waive this requirement for students who study away on a Cal Poly led program, Cal Poly affiliated program, or department-approved exchange program for part of their last 30 units; and finally, that this requirement becomes effective for all students graduating under the 2026-27 and subsequent semester-based Catalogs
Range-Doppler Map Processing Chain For Marine Radar On FPGA Of An RFSoC
Get PDFTo improve the accuracy and resolution of the measurements, radar systems employ increasingly complex, resource-intensive signal processing, larger bandwidths, and higher carrier frequencies. However, implementing these improvements requires more expensive, complex electronics that are larger and use more power. Using RFSoC (Radio Frequency System on Chips) in radars can address these challenges. By combining processors, an FPGA (Field Programmable Gate Array), and RF data converters into a single integrated circuit, RFSoCs allow for radar electronics that are physically smaller, use less power, and are simpler to design. As using RFSoCs to perform RF data conversion for radars has been already explored, this work focuses on performing radar processing for a marine radar with an RFSoC. Performance specifications for a marine radar are defined based on the specifications for other modern marine radars, a suitable radar waveform is designed based on the derived performance specifications, and a processing chain to compute the range-doppler map is implemented based on the radar specifications and waveform. The processing chain, created as a block design in the Vivado Design Suite, consists of matched filtering and doppler processing. The processing chain is simulated in Vivado and implemented on the FPGA of a Xilinx ZCU216 RFSoC Evaluation Board. To verify the operation of the processing chain, the range-doppler maps generated by simulation and from running the design on the ZCU216 board are compared with range-doppler maps generated by a processing model implemented in MATLAB. The range-doppler map processing chain performs correctly as the outputs from simulation and the ZCU216 show close agreement with the MATLAB results with average percent differences on the order of 10-4 % to 10-5 % and average differences on the order of 10-7. The processing chain generates the range-doppler map quickly: the final range-doppler value is output 1.75 milliseconds after the final sample of a CPI (Coherent Processing Interval) of radar data (the total CPI duration is 10.49 milliseconds) is input. The FPGA resource usage of the processing chain is 85% of the BRAM, 0% of the URAM, 0.87% of the DSP slices, and approximately 1% of the configurable logic blocks. The low resource usage of the processing chain allows for possibilities of future expansion of the processing chain to include radar processing techniques such as digital beamforming or threshold estimation
USING NONINVASIVE CALIBRATED CUFF PLETHYSMOGRAPHY TO OBSERVE THE EFFECTS OF COLD-WATER IMMERSION ON ARTERIAL COMPLIANCE
Get PDFAs the prevalence of cardiovascular diseases continues to exponentially grow in populations across the globe, the necessity of determining underlying factors, effective methods of diagnoses, and universally available preventive measures also grows. Early detection of endothelial dysfunction, a proven precursor of cardiovascular diseases, can be extremely impactful in encouraging preventative measures and early intervention before medical conditions become chronic. In recent years, ice plunging, a form of cryotherapy involving full body immersion in cold water, has gained popularity within circles of fitness and health practitioners, gaining the interest of people of all backgrounds. Certain parallels observed between the human physiological response to cold exposure and endothelial function encourage further study of the effects of ice plunging on cardiovascular health. Calibrated cuff plethysmography is a promising method of reflecting on endothelial function by measuring arterial compliance of select blood vessels. In this study, a calibrated cuff plethysmography device was built and tested for efficiency as it was used to measure compliance and cross-sectional area of the brachial artery of 14 participants 30 minutes before, immediately after, and 30 minutes after a 5-minute cold plunge in a temperature of 10°C - 15°C. Results found some significant differences between baseline measurements recorded immediately after the ice plunge and measurements recorded during reactive hyperemia conditions at normal body temperature but did not conclude that 5-minute cold-water immersion intervention had a significant impact on arterial compliance or area overall since this was a short term experiment with only acute intervention methods. The device used was concluded to effectively measure arterial compliance and area
NOVEL METHOD OF THE QUANTIFICATION OF TURBULENT FLUID FLOW IN SILICONE ARTERY PHANTOMS USING ACOUSTIC ANALYSIS
Get PDFCardiovascular disease is the leading cause of death globally and is responsible for taking 17.9 million lives per year. Despite the use of clinical treatments and detection methods, there remains a large population of individuals that suffer from CVD whose symptoms are left undetected and untreated prior to a life-threatening cardiac event. This highlights a need for an early detection method that can prevent the manifestation and worsening of the disease as well as address limitations of current early detection methods. An area of interest for early detection of CVD is subclinical atherosclerosis, which is the long, early, asymptomatic stage of plaque formation. Subclinical atherosclerosis has been namely associated with endothelial dysfunction and is the result of the pathological state of the endothelium due to its impact on vascular homeostasis, thrombosis, and vascular tone. Endothelial dysfunction is a result of several factors contributing to and promoting inflammation and results in changes in biological pathways that can alter the surface of the endothelium. This surface modification or added roughness changes the flow profile from laminar to turbulent flow due to the decreased shear stress on the vascular wall. Current detection methods such as carotid intima media thickness (CIMT) and flow-mediated dilation (FMD) targeted at identifying the early stages of atherosclerosis present limitations such as identifying late-stage effects of plaque formation and subjective readings highlight the need for a different approach to early detection. This experimental study aims to present a possible method of detecting the morphological changes of the endothelium due to inflammation through acoustic analysis of flow. Three silicone artery phantom groups were created with different degrees of inner diameter surface roughness to explore the relationship between relative roughness and sound associated with fluid flow. The results of this study are power spectral density graphs (PSD) which show frequency peaks associated with each of the phantoms at a theoretical laminar and turbulent Reynolds number. The PSD graphs show that there is a difference in frequency response between a smooth and rough artery phantom at the same flow rate providing preliminary support that sound analysis of fluid flow could provide information regarding early-stage cardiovascular disease
Religion: A Repertoire of Earth Ethics – A Study on the Ecospiritual Dimensions in Refuge: An Unnatural History of Family and Place by Terry Tempest Williams
Get PDFEcological crisis, a contemporary reality has triggered a paradigm shift in human thinking and discourse. Greening of religion is a novel approach to the interpretation of religious literature. The purpose of this study is to identify how literature reflects religious ethics centred on ecology and it brings out perspectives of religion regarding environmental conservation. Through a close reading of the literary text Refuge: An Unnatural History of Family and Place by Terry Tempest Williams, this paper aims to validate how the ecological ethics of religions can be a solution to environmental crisis and how this ecological reformation in spirituality should be given the intellectual respect it deserves