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The Materials Advantage of the SLS Selective Laser Sintering Process
The rapid prototyping market continues to progress in tenns of processes and materials
used for the creation of conceptual and functional parts and prototype tooling. As this market
continues to mature, the market leaders win be able to offer rapid prototyping processes and
materials that provide parts which are accurate, have good surface finish, and provide properties
which support fqnctional applications.. The materials used for these parts will be. polymers, metals,
and ceramics. '. The strength oithe SLSTM Selective Laser Sintering Process is the. potential to use a
wide variety of powdered materials for the creation of models, patterns, and some fonns of
prototype tooling. ,This paper will cover the types of materials currently used in the SLS process
and their inherent advantages.and discuss current research into the development of new materials.Mechanical Engineerin
A comparison of the antimicrobial efficacy of silver diamine fluoride and silver nitrate: an in vitro study
A COMPARISON OF THE ANTIMICROBIAL EFFICACY OF SILVER DIAMINE FLUORIDE AND SILVER NITRATE: AN IN VITRO STUDY
By: Nicholas L Luke, D.D.S.
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Dentistry at Virginia Commonwealth University.
Virginia Commonwealth University, May 2018
Thesis Advisor: William O. Dahlke Jr., D.M.D.
Pediatric Dentistry, Department Chair
Purpose: To determine the antimicrobial efficacy of SDF and SN/NaF.
Methods: Three bacterial species were combined to create an in vitro biofilm. Treatment was completed with SN, SN/NaF, SDF, SDF½ or untreated (control).
Results: The untreated group demonstrated significantly higher growth than all other treatment groups across the study. On the BHI-plates (1-day), there were significant differences between all treatments except SDF and SDF½. On the BHI-plates (3-days), SN/NaF was not significantly different from SDF or SDF½. On the L-MRS-plates (1-day), both SN treatment groups yielded significantly higher growth than the SDF groups. On the L-MRS-plates (3-days), SN yielded significantly higher growth than SN/NaF, SDF, and SDF½.
Conclusion: SDF is more effective than SN/NaF, with the exception of BHI-plates (3-days) only and SN/NaF is more effective than SN on primarily S. mutans and L. acidophilus. There is evidence of a possible antimicrobial tolerance of oral bacteria to silver
Rational approximations to the solution of the second order Ricatti equation Technical report, 15 Jan. - 14 Oct. 1965
Rational approximations to solution of second order nonlinear Ricatti equation, using linear transformations - differential equations and operational calculu
Generalized rational approximations with applications to problems in control theory Interim technical report
Rational approximations and solution of control theory problems involving Ricatti equation
Analysis of the coupled frequencies and mode shapes of vehicle control systems Final report, 15 Apr. 1965 - 14 Apr. 1966
Coupled frequencies and mode shapes of vehicle control syste
Rational approximations to the generalized Duffing equation Final report, 15 Jan. - 1965 - 14 Jan. 1966
Linear transformation to obtain rational approximation to response of physical system described by nonlinear differential equation including Duffing equation as special cas
The Visible Hand: Race and Online Market Outcomes
We examine the effect of race on market outcomes by selling iPods through local online classified advertisements throughout the United States in a year-long field experiment. Each ad features a photograph of the product being held by a dark- or light-skinned (“black” or “white”) hand. To provide context, we also consider a group of sellers against whom buyers might statistically discriminate for similar reasons: white sellers with wrist tattoos. Black sellers do worse than white sellers on a variety of market outcome measures: They receive 13% fewer responses and 17% fewer offers. These effects are strongest in the Northeast, and are similar in magnitude to those associated with the display of a wrist tattoo. Conditional on receiving at least one offer, black sellers also receive 2–4% lower offers, despite the selfselected—and presumably less biased—pool of buyers. In addition, buyers corresponding with black sellers exhibit lower trust: They are 17% less likely to include their name in e-mails, 44% less likely to accept delivery by mail, and 56% more likely to express concern about making a long-distance payment. We find evidence that black sellers suffer particularly poor outcomes in thin markets; it appears that discrimination may not “survive” in the presence of significant competition among buyers. Furthermore, black sellers do worst in the most racially isolated markets and markets with high property crime rates, consistent with channels through which we might expect statistical discrimination to operate.race, advertising
Numerical integration of nonlinear differential equations by use of rational approximation Final report, 15 Jan. 1965 - 14 Jul. 1967
Numerical integration of nonlinear differential equations by use of rational approximatio
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