Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 343 for “"positivity"”.
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Invariant Differential Positivity
… of monotonicity is provided by differential positivity with respect to a constant cone field, which combines positivity theory with a local analysis of nonlinear systems. Since many dynamical systems are naturally defined on nonlinear spaces, it is important to seek a suitable adaptation of …
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Combinatorial aspects of total positivity
… aspects of an emerging field known as total positivity. The classical theory of total positivity concerns matrices in which all minors are nonnegative. While this theory was pioneered by Gantmacher, Krein, and Schoenberg in the 1930s, the past decade has seen a flurry of research in this area …
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Total positivity and real flag varieties
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1998.
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Negative answers to some positivity questions
… to a number of questions related to positivity properties of line bundles on algebraic varieties. The examples are based on studying the geometry of varieties that admit pseudo automorphisms of positive entropy, and in particular on the action of standard Cremona transformations on …
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Liberté - The Positivity Coffee Bar: Challenging Perceptions
There are 117 prisons in England and Wales (Institute For Government (IFG), Prisons, 2022). But there are no prisons for women, in Wales (Fraser, 2018; Gov. Wales, 2022). Society and community suffer from preconceived ideas, often based on fear and rumour, labelling women ex-offenders or persons …
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Economic pressure, positivity, and positive child development
… of this dissertation is to identify the role of positivity as a resiliency factor for individual adaptive functioning and a protective factor for young children’s positive development. The dissertation includes two studies: the first study examined the association between individuals’ economic …
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Positivity properties associated with linear differential operators
… of this dissertation is the study of analogous positivity results associated with linear differential operators of the form (Ly)(t) = a₂(t)y''(t) + a₁(t)y¹(t) + a₀(t)y(t), where a₂(t), a₁(t) and a₀(t) are real-analytic in some interval I and where a₂(t) > 0 for t ε I. We call a function f ε …
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Positivity preserving solutions of partial integro-differential equations
… domain knowledge can address these issues. Positivity and mass-conservation of certain quantities are two conditions that are difficult to achieve in standard numerical solution methods. However, careful design of the discretizations can achieve these properties with a negligible performance …
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Symmetries, unitarity and positivity of cosmological effective field theories
… scales. Finally we provide a new way to derive positivity bounds and constrain which parts of this parameter space admit unitary and causal UV completions. Comparing with observational constraints on primordial non-Gaussianities, they give us new ways to unravel the physics of inflation.
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Promoting Positivity: Securing Memphis's Image in Times of Crisis
Situating the 1878 yellow fever epidemic in Memphis's long history shows how concern over Memphis's national reputation influenced how city leaders dealt with crisis. Throughout its history, Memphis government officials and business leaders promoted Memphis as a good city to do business, free from …
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A Patankar Predictor-Corrector Approach for Positivity-Preserving Time Integration
… solutions. This thesis presents a novel positivity-preserving correction strategy applicable to general time integration schemes, with a particular focus on Runge-Kutta methods. The proposed method operates as a predictor-corrector framework, using algebraic post-processing to clip …
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Positivity: A key for enhancing creativity. Enhancing organizational creativity through positive leadership
… Advertising Agency. The results indicate that positivity (the quality of having a positive mindset) is a key behavioral contributor to enhanced creativity. Positivity was found to positively influence employee psychological well-being as well as motivation. Both motivation and psychological …
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Redefining health on Instagram: Women's experiences with body positivity and body neutrality
… thesis explores women’s experiences with body positivity and body neutrality movements on social media. Body positivity is an umbrella term for a movement that resists diet culture and beauty standards which emphasize thinness and whiteness. Mainstream body positivity focuses on loving one’s …
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Analysis and implementation of a positivity preserving numerical method for an HIV model
… deals with analysis and implementation of a positivity preserving numerical method for a vaccination model for the transmission dynamics of two HIVsubtypesnin a given community. The continuous model is analyzed for stability and equilibria. The qualitative information thus obtained is used …
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The Thin Ideal and Body Positivity: How Do Influencers Affect Female Instagram Users?
… influencers. They also support the body positivity movement but are not comfortable posting body positive content. To manage the paradox, participants took actions to create an idealized Instagram account while also taking steps to avoid the thin ideal.</p>
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Negativity and Positivity Biases in Product Evaluations: The Impact of Consumer Goals and Prior Attitudes
… with extant theories of the negativity and positivity effects is provided, and four experiments are conducted to systematically test this explanation against the extant theories of negativity and positivity effects. Results indicate that selective hypothesis testing is a viable explanation …
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Constraints on Pion-Pion Partial Wave Amplitudes Below Threshold, From Crossing Symmetry, Positivity and Analyticity
Made available in DSpace on 2015-05-12T22:38:46Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7212182.PDF: 3553094 bytes, checksum: c2a234ae2fb8e15ae8cbda3f75daac13 (MD5) Previous issue date: 1971
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Constraints on pi-pi partial wave amplitudes below threshold, from crossing symmetry, positivity and analyticity
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-03-20T18:42:54Z No. of bitstreams: 1 1971_griss.pdf: 4463098 bytes, checksum: e116157fb542c2257ff2212345037457 (MD5)
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Positivity Beyond Absence of Negativity: Social Competence Mediates the Association Between Positive Parenting and Adolescent Friendship Quality
Parenting is important for adolescent friendship development. However, previous research has focused on the adverse effect of negative parenting on adolescents' behavioral problems that undermines their friendships (e.g., Cook et al., 2012). Positive parenting, beyond the absence of negative …
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