Residual stress in plasma sprayed ceramic turbine tip and gas path seal specimens

The residual stresses in a ceramic sheet material used for turbine blade tip gas path seals, were estimated. These stresses result from the plasma spraying process which leaves the surface of the sheet in tension. To determine the properties of plasma sprayed ZrO2-Y2O3 sheet material, its load deflection characteristics were measured. Estimates of the mechanical properties for sheet materials were found to differ from those reported for plasma sprayed bulk materials

The Creole Connection: What Happens Next?

The purpose of this case is to demonstrate the importance of target market selection and positioning, particularly for businesses in small college towns. Additionally, other marketing and management issues are presented to stimulate understanding of the multitude of variables that impact restaurant success. This case is intended for those interested in marketing, management, entrepreneurship, hotel/restaurant management or retailing areas

Asymptotics for the number of n-quasigroups of order 4

The asymptotic form of the number of n-quasigroups of order 4 is $3^{n+1} 2^{2^n +1} (1+o(1))$. Keywords: n-quasigroups, MDS codes, decomposability, reducibility.Comment: 15 p., 3 fi

Comparing Ecological Sensitivity with Stream Flow Rates in the Apalachicola-Chattahoochee-Flint River Basin

Environmental Economics and Policy, Resource /Energy Economics and Policy,

The Effect of Antecedent Mood On Customer Loyalty Intentions: A Mood-By-Gender Interaction

This study suggests that induced antecedent moods may, in a systematic manner, influence subsequent levels of loyalty intention within consumer scenarios. Furthermore, this research finds that there exists differential responses to induced mood states by gender, which fall in line with research on the underlying gender differences in cognitive processing, levels of risk aversion, motivation, and the experience of emotion while shopping. Past studies in this area have shown only a mild connection between induced antecedent mood state and loyalty intentions, which may be due in part to the issue of an emotion by gender interaction. This paper reinforces previous work and extends this relationship to include gender as moderator. With a better understanding of the way in which different mood states influence customer loyalty intentions, a new approach to managing customer mood-states emerges

Cyclic mutually unbiased bases, Fibonacci polynomials and Wiedemann's conjecture

We relate the construction of a complete set of cyclic mutually unbiased bases, i. e., mutually unbiased bases generated by a single unitary operator, in power-of-two dimensions to the problem of finding a symmetric matrix over F_2 with an irreducible characteristic polynomial that has a given Fibonacci index. For dimensions of the form 2^(2^k) we present a solution that shows an analogy to an open conjecture of Wiedemann in finite field theory. Finally, we discuss the equivalence of mutually unbiased bases.Comment: 11 pages, added chapter on equivalenc

Use of Social Media by Sales Students for First Post-Graduation Job-Search: An Exploratory Study

As students who studied/majored in professional sales approach graduation and start looking for their first post-graduation/entry-level positions, what avenues are used to pursue these opportunities? One might suspect that with the explosion of social media and the millennial generation’s prolific use of said media this would be their preferred choice for job hunting. Are sales students engaging social media and other online activities to land entry-level career positions or are they still using traditional methods (i.e. College/University Career Fairs, College/University Career Services, Internships, etc.) to find these positons? This paper looks at the avenues millennial students who studied/majored in professional sales use to land their first post-college graduation sales positions

The effect of annealing on the creep of plasma sprayed ceramics

The creep of plasma sprayed ZrO2-8Y2O3 was measured at temperatues from 98 to 1250 C (180 to 220 F), and compared to creep of identical samples after annealing at temperatures from 98 to 1316 C (1800 to 2400 F). Loads and temperatures which produced significant creep of as sprayed ceramics produced no creep after annealing

Film and interstitial formation of metals in plasma-sprayed ceramics

A method is described to electrodeposit noble metals such as platinum and ordinary metals such as copper on and within plasma-sprayed ceramic materials and ceramic fiber materials. Low-density ceramic fiber bodies were vacuum impregnated with plating solution and attached to an electrode. Light micrographs illustrating the density and location of deposited materials are presented and discussed. Voids in the plasma-sprayed ceramic were filled with deposits that vary from spherical to lens-shaped circular and have particle size corresponding to the full range of void size. Multiple coatings of ceramic and metal can be sequenced

Correlation of compressive stress with spalling of plasma sprayed ceramic materials

Ceramics on metal substrates for potential use as high temperature seals or other applications are exposed to forces originating from differences in thermal expansion between the ceramic and the metal substrate. This report develops a relationship between the difference in expansion of the ceramic and the substrate, defines conditions under which shear between the ceramic and the substrate occurs, and those under which bending forces are produced in the ceramic. The off-axis effect of compression forces resulting from high temperature plastic flow of the ceramic producing buckling of the ceramic is developed. Shear is associated with the edge or boundary stresses on the component while bending is associated with the distortion of an interior region. Both modes are significant in predicting life of the ceramic