172 research outputs found
Asa G. Hilliard, III Papers
No full textThe Asa G. Hilliard, III papers span the years between 1933 and 2007. The bulk of the collection dates from 1971 to 2007. The collection includes organizational files from organizations of which Hilliard was a member, subject files on topics of interest, records from his work at both San Francisco State University and Georgia State University, files related to his speaking engagements, photographs and videos, and manuscripts of articles, books, speeches and reports. The collection also contains some materials related to trials in which Hilliard served as an expert witness. Of note are the files related to the Larry P. V. Wilson Riles case from the late 1970s, photographs of the ceremony during which Hilliard became Nana Baffour and the slides from Hilliard's presentation "Free Your Mind! Return to the Source.
Digitized audio-visual materials from the Asa G. Hilliard, III Papers feature speeches, lectures, and presentations given by Dr. Hilliard and others between 1964 and 2000, throughout the United States. Topics include Afrocentricity, Egypt, Black history, education, and school psychology.
At the AUC Robert W. Woodruff Library we are always striving to improve our digital collections. We welcome additional information for any of the works in this collection. To submit information, please contact us at [email protected]
To Exercise Our Talents : The Democratization of Writing in Britain /
No full textIn twentieth-century Britain the literary landscape underwent a fundamental change. Aspiring authors--traditionally drawn from privileged social backgrounds--now included factory workers writing amid chaotic home lives and married women joining writers' clubs in search of creative outlets. In this brilliantly conceived book, Christopher Hilliard reveals the extraordinary history of "ordinary" voices. In capturing the creative lives of ordinary people--would-be fiction-writers and poets who until now have left scarcely a mark on written history--Hilliard sensitively reconstructs the literary culture of a democratic age.In twentieth-century Britain the literary landscape underwent a fundamental change. Aspiring authors--traditionally drawn from privileged social backgrounds--now included factory workers writing amid chaotic home lives and married women joining writers' clubs in search of creative outlets. In this brilliantly conceived book, Christopher Hilliard reveals the extraordinary history of "ordinary" voices. In capturing the creative lives of ordinary people--would-be fiction-writers and poets who until now have left scarcely a mark on written history--Hilliard sensitively reconstructs the literary culture of a democratic age.Electronic reproduction.Mode of access: Internet via World Wide Web.Description based on online resource; title from PDF title page (publisher’s Web site, viewed October 27 2015
Culture Takeaway
Get PDFThis keynote is mainly based on Wallace's research for Volume X of La Cultura Italiana published by UTET in 2010. The volume is in Italian and, by translating it, it can now be shared with colleagues, students and friends. The relationship that each citizen has with his/her own country and culture is mediated by personal experiences and matured during a lifetime. It is a delicate task to identify what motivates the consciousness of “insiders” of a culture whilst, at the same time, stimulating the interest of outsiders. To be able to observe the prodigious artistic production of one’s own country from the point of view of another culture and another genetic material offers fresh cues. Curiosity, prodded by geographical and physical distance, helps to identify in a schematic way those characteristics that define a country’s visual culture in a decisively distinctive way
Finite Element Analysis of Cahn-Hilliard equations: Mass transfer of an oil-soluble chemical for water control
No full textTwo models have been constructed and physically motivated based on the (system of) Cahn-Hilliard equation(s) and Stefan problem in order to describe the behavior of fluids in a hypothetical mixture. A finite element method is developed to solve the Cahn-Hilliard equations based on a mixed formulation where reduction of the forthorder spatial derivative is applied. The method is also extended to multiple species. Furthermore, mass conservation and energy decrease for the (system of) Cahn-Hilliard equation(s) as well as the Stefan problem are demonstrated mathematically. Then, all proved mathematical subjects have been verified by the numerical aspects for the purpose of approving the numerical results. The Cahn-Hilliard equations with a diffuse interface has been compared to a Stefan problem with a sharp interface and a reasonable agreement is obtained. To find out the advantages and disadvantages, the results and assumptions are discussed at the end for both models.Civil Engineering and GeosciencesGeoscience & EngineeringPetroleum Engineering and Geoscience
Numerical methods for the implementation of the Cahn-Hilliard equation in one dimension and dynamic boundary condition in two dimensions
No full textThis project can be divided into two parts. The goal of the first part is to numerically implement the Cahn-Hilliard equation in one dimension both explicitly and implicitly. This will be done using Matlab. The goal of the second part is to validate the coupled Cahn-Hilliard-Navier-Stokes equation and the dynamic boundary condition for moving contact lines of (Carlson et al, 2011, p.9) by considering a two-dimensional spreading droplet case. This will be done using the CFD software OpenFOAM. In Chapter 1, the theory of positive and negative diffusion, including the normal diffusion equation and the Cahn-Hilliard equation, are discussed. Some background is given regarding the thermodynamics of the Cahn-Hilliard equation and its steady-state solution. After that, the theory of the coupled Cahn-Hilliard-Navier-Stokes equation, the dynamic boundary condition for moving contact lines and the case which is implemented in OpenFOAM, are discussed. In Chapters 2 and 3, the diffusion equation and the Cahn-Hilliard equation are implemented in one dimension, using the Euler Forward scheme. In implementing the Cahn-Hilliard equation, two different discretizations are used, of which only one gives the desired results. Next, an extensive stability analysis is done, using a linearization of the Cahn-Hilliard equation as well as numerical experiments. The stability condition is increasingly severe with increasing interface width. Regarding the results of the evolving interface, a qualitative analysis is done which discusses three subjects: the deviation of the solutions with the steady-state solution, the interface width for different parameters and grid sizes and the interface overshoot, which is an unphysical appearence. In Chapter 4, two semi-implicit methods and one implicit iterative method, are discussed. The implementations of the two semi-implicit methods, Implicit-Explicit (ImEx) and Modified Furihata, are succesful and their stability conditions are better than the stability condition of the Euler Forward scheme, for most interface widths. The results regarding the evolving interface are nearly identical to the results of the Euler Forward scheme, therefore the qualitative analysis is also similar. The implicit iterative method, which involves the use of the G\^ateaux derivative, has not been succesfully implemented, eventhough two different discretizations are used. The results regarding the evolving interface are behaving in a positive diffusive way, which results in a flattening interface with time. In Chapter 5, the coupled Cahn-Hilliard-Navier-Stokes equation and a dynamic boundary condition for moving contact lines are used to model a spreading droplet on a flat surface. The implemented model is validated using different cases in which the steady-state contact angle and the friction factor of the surface varies. Next, parametric studies are done regarding the interface width, the surface tension and the ratio of the surface tension and the friction factor. The conclusions are that the modeled system differs too much from the system in literature to make an absolute comparison but, qualitatively, the model behaves as expected.Transport PhenomenaChemical EngineeringApplied Science
Existence of solutions for two types of generalized versions of the Cahn-Hilliard equation
Get PDFsummary:We show existence of solutions to two types of generalized anisotropic Cahn-Hilliard problems: In the first case, we assume the mobility to be dependent on the concentration and its gradient, where the system is supplied with dynamic boundary conditions. In the second case, we deal with classical no-flux boundary conditions where the mobility depends on concentration , gradient of concentration and the chemical potential . The existence is shown using a newly developed generalization of gradient flows by the author and the theory of Young measures
Pharmacokinetics and toxicodynamics of intravenously administered rigid microparticles that passively target the pulmonary circulation of rodents
No full textSystemic treatment of localized diseases, currently the most widely used method of drug delivery, often results in dose limiting toxicity. Reducing the amount of drug administered to minimize toxicity often reduces treatment effectiveness. Many drug delivery systems actively target their site based on an over-expression of cell surface receptors that may differ during disease or treatment progression. The purpose of this thesis was to determine the optimal size/number of intravenously administered rigid polystyrene microparticles (MPs) that are passively filtered by the pulmonary circulation system prior to causing dose-limiting toxicity and to develop an appropriately sized rigid yet biodegradable MP for future use. Passive entrapment of MPs in the lung depended upon size. In a rat model, rigid, non-degradable 10 μm polystyrene MPs were trapped in the lung capillary and remained for the duration of the 1-week study. Smaller MPs (6 μm) were initially trapped in the lung but migrated to the liver and spleen over 48 h whereas 3 μm MPs eluded the lung’s filtering capability and became entrapped in the liver by 1 h. To devise a non-invasive technique to detect early toxicity, a mathematical algorithm based on a clinically-relevant, non-invasive method developed in humans was adapted to study pulmonary gas exchange in young CD-1 mice. A threshold MP dosage that resulted in a rapid decrease in function was found for different MP sizes. The ventilation-perfusion ratio (VA/Q) was dramatically reduced from pre-treatment to Day 1 post-treatment when ≥550,000 10 μm MPs/g, ≥40,000 25 μm MPs/g or ≥4,000 45 μm MPs/g were administered. Shunt increased slightly with MP burden but was not a consistent early marker for impaired gas exchange from microemboli. Of interest was that by Day 7, the resulting hypoxemia was resolved. Finally, the manufacture of biodegradable, albumin-based MPs was optimized to create an appropriately-sized narrow distribution using an emulsion technique. Increased heating (150 °C vs. 120 °C) caused an increase in lysinoalanine formation and decreased the lung clearance rate, while not changing MP size. In summary, understanding of the pharmacokinetics, toxicodynamics, and design of passively targeted intravenously administered MPs was significantly advanced.Ph. D.Includes bibliographical referencesIncludes vitaby Hilliard L. Kutsche
A unified framework for Navier-Stokes Cahn-Hilliard models with non-matching densities
Get PDFOver the last decades, many diffuse-interface Navier-Stokes Cahn-Hilliard
models with non-matching densities have appeared in the literature. These
models claim to describe the same physical phenomena, yet they are distinct
from one another. The overarching objective of this work is to bring all of
these models together by laying down a unified framework of Navier-Stokes
Cahn-Hilliard models with non-zero mass fluxes. Our development is based on
three unifying principles: (1) there is only one system of balance laws based
on continuum mixture theory that describes the physical model, (2) there is
only one natural energy-dissipation law that leads to quasi-incompressible
Navier-Stokes Cahn-Hilliard models, (3) variations between the models only
appear in the constitutive choices. The framework presented in this work now
completes the fundamental exploration of alternate non-matching density
Navier-Stokes Cahn-Hilliard models that utilize a single momentum equation for
the mixture velocity, but leaves open room for further sophistication in the
energy functional and constitutive dependence.Comment: Corrections; 49 page
Asa G. Hilliard, III Symposium, Day 2, September 23, 2022
No full textThe AUC Woodruff Library hosted the Asa G. Hillard, III Symposium, "Return to the Source", a two-day symposium celebrating the life and legacy of Dr. Hilliard with his family, friends, colleagues, students, and educators. Day 2 of symposium featured Truer of Voice special speakers, Dr. Mario Beatty, Dr. Rev. Iva Carruthers, and Dr. Joyce King that covered topics related to Dr. Hilliard's work on Kemetic Studies, African Spiritualities, African healing, curating knowledge, applying what we know, scholarship, rigor, teaching, pedagogy, teacher education and more. The one Mbongi session facilitated a conversation about having the will to educate the youth and collaborating to become current and future translators and facilitators working for liberation. The symposium highlighted archival video from the Dr. Asa G. Hilliard, III Papers in the AUC Woodruff Library's Archives Research Center. The symposium closes with remarks by The Hilliard Family
From nonlocal Euler-Korteweg to local Cahn-Hilliard via the high-friction limit
No full textSeveral recent papers considered the high-friction limit for systems arising in fluid mechanics. Following this approach, we rigorously derive the nonlocal Cahn-Hilliard equation as a limit of the nonlocal Euler-Korteweg equation using the relative entropy method. Applying the recent result by the first and third author, we also derive rigorously the local degenerate Cahn-Hilliard equation. The proof is formulated for dissipative measure-valued solutions of the nonlocal Euler-Korteweg equation which are known to exist on arbitrary intervals of time. Our work provides a new method to derive equations not enjoying classical solutions via relative entropy method by introducing the nonlocal effect in the fluid equation
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