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Familial Stress and Academic Performance: The Role of an Outside Stress Factor on the Academic Success of College Students
No full textWSU Vancouver Honors ThesisCollege students face large amounts of pressure to succeed, both in their academic pursuits and in their home lives. That pressure may cause a significant change in the way these students are able to succeed academically, or at the very least their perceptions of how well they are performing. Students face stress from multiple different sources throughout their academic careers, but the effects of an individual outside stressor on academic performance are limited.
Family-based stress may have a significant adverse effect on the academic performance of college students. After building and releasing a 20-question survey that focused exclusively on a student's family-based stress and their academic successes, a significant effect was found (r (27) = +0.46, p < .05, two-tailed, r2 = 0.21). This indicates that as a student experiences a higher degree of familial stress, their dissatisfaction with their academic performance increases as well. Students should be aware of this trend while making plans for college as to help alleviate some
of the pressure they might face, and campuses can allocate resources to areas that would benefit students most, such as access to mental health resources and stress management courses
ADDITIVE MANUFACTURING OF APPLICATION-BASED MULTI-MATERIAL STRUCTURES VIA LENS(TM) PROCESS: BUILD STRATEGIES AND UNDERSTANDING PROCESSING CHALLENGES
No full textThesis (Ph.D.), Mechanical Engineering, Washington State UniversityMulti-material structures provide unique solutions to many engineering problems through enhanced-property capabilities to achieve site-specific functionalities in engineering systems. Among structures made of multi-materials, bimetallics comprise largely of two different metals joined together to benefit from the distinct properties of the base materials, or to selectively improve the overall performance of one of the components. But, bimetallic-joint’s processing suffers immensely from bonding compatibility issues due to mismatch in metallurgical and thermal properties of the base-metals. Four different build-strategies: direct bonding, compositional gradation, intermediate and compositional bond layers were employed to fabricate different bimetallic joints through laser engineered net shaping (LENSTM) process. These bonding techniques applied to specific materials’ combinations stem the four research projects. In the first instance, titanium alloy (Ti64) and niobium (Nb) materials were bonded together via direct deposition due to metallurgical compatibility, single-phase solid solution, of the base-elements. Directly bonded structures are mostly characterized with well-defined interface with sharp properties’ variation. Compositional gradation approach minimizes such interfacial properties’ mismatch. Hence, the second research project involved using this strategy to fabricate a bimetallic joint of Inconel 718 and GRCop-84 materials. In the third research project, a concept suitable for bonding immiscible materials was employed. Ti64 and SS410 are dissimilar metals with incompatible metallurgical properties. An intermediate layer material, Nb, was used to join these materials. A proof-of-concept part for the direct application of the bimetallic structure was demonstrated. The final project involved use of compositional bond layer (CBL) (a mixture of VC + the base-materials) to fabricate a bimetallic structure of metallurgically incompatible alloys, Inconel 718 and Ti64. In all the four projects, a crack-free joint with no delamination or de-bonding features at the interfaces of the bimetallic joints were observed. In addition, the bimetallic joints, especially Ti64/Nb, Inconel 718/GRCop-84 and Ti64/SS410 showed strong interfacial bond strength in comparison to the base-materials. Thermal diffusivity of Ti64 and Inconel 718 materials were enhanced, as well. Hence, to manufacture a mechanically reliable joint of dissimilar materials with tailored/enhanced properties requires understanding the process-property relationships. It holds promise of next generation multi-materials metal additive manufacturing for hi-tech applications in engineering structures.Washington State University, Mechanical Engineerin