202,113 research outputs found
Spatio-temporal growth of disturbances in a boundary layer and energy based receptivity analysis
No full textIn fluid dynamical systems, it is not known a priori whether disturbances grow either in space or in time or as spatio-temporal structures. However, for boundary layers, it is customary to treat it as a spatial problem and some limited comparison between prediction and laboratory experiments exist. In the present work, the receptivity problem of a zero pressure gradient boundary layer excited by a localized harmonic source is investigated under the general spatio-temporal framework, using the Bromwich contour integral method. While this approach has been shown to be equivalent to the spatial study, for unstable systems excited by a single frequency source [T. K. Sengupta, M. Ballav, and S. Nijhawan, Phys. Fluids6, 1213 (1994)], here we additionally show, how the boundary layer behaves when it is excited (i) at a single frequency that corresponds to a stable condition (given by spatial normal-mode analysis) and (ii) by wideband frequencies, that shows the possibility of flow transition due to a spatio-temporally growing forerunner or wave front. An energy based receptivity analysis tool is also developed as an alternative to traditional instabilitytheory. Using this, we reinterpret the concept of critical layer that was originally postulated to explain the mathematical singularity of inviscid disturbance field in traditional instabilitytheory of normal modes
Uniform Bounds on Product Sylvester-Gallai Configurations
No full textIn this work, we explore a non-linear extension of the classical Sylvester-Gallai configuration. Let be an algebraically closed field of characteristic zero, and let ℱ = {F_1, …, F_m} ⊂ [x_1, …, x_N] denote a collection of irreducible homogeneous polynomials of degree at most d, where each F_i is not a scalar multiple of any other F_j for i ≠ j. We define ℱ to be a product Sylvester-Gallai configuration if, for any two distinct polynomials F_i, F_j ∈ ℱ, the following condition is satisfied: ∏_{k≠i, j} F_k ∈ rad (F_i, F_j) .
We prove that product Sylvester-Gallai configurations are inherently low dimensional. Specifically, we show that there exists a function λ : ℕ → ℕ, independent of , N, and m, such that any product Sylvester-Gallai configuration must satisfy: dim(span_(ℱ)) ≤ λ(d).
This result generalizes the main theorems from (Shpilka 2019, Peleg and Shpilka 2020, Oliveira and Sengupta 2023), and gets us one step closer to a full derandomization of the polynomial identity testing problem for the class of depth 4 circuits with bounded top and bottom fan-in
Supplemental Material - Metro–Nonmetro Differences in Adverse Events in Residential Care Communities: Results From the National Post-Acute and Long-Term Care Study
No full textSupplemental Material for Metro–Nonmetro Differences in Adverse Events in Residential Care Communities: Results From the National Post-Acute and Long-Term Care Study by Manisha Sengupta and Emily M. Agree in Journal of Applied Gerontology.</p
Intern experience at the Honeywell Test Instrument Division: an internship report
No full text"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirements for the degree of Doctor of Engineering."Includes vita (leaf 42)Includes bibliographical referencesThis report documents the industrial experience accrued by the author
during a twelve month Doctor of Engineering internship served with Honeywell. The internship
was served at the Test Instrument Division, Denver, Colorado as a Biomedical Applications
Engineer between June 15, 1976 and June 30, 1977
High Economic Growth, Equity and Sustainable Energy Development of India
No full textIndia has been experiencing sustained high economic growth in the recentyears. However, there exists substantial amount of unacceptable poverty among the people in the country. The expressions of symptoms of such poverty include among others inadequate educational and health attainment of the people and lack of access to basic amenities like modern clean energy, safe water and sanitation which are crucial determinants of capability development. There exists in fact significant amount of energy poverty among the people, particularly in the rural India which has more than 70% share of its population, in the form of use of traditional inefficient biomass as the primary fuel with injurious health effect and the lack of connectivity of the households with electricity. The eleventh five year plan of India which has recently been initiated has taken the approach of inclusive faster growth for the development of the Indian economy. This paper analyses the implications of this high inclusive growth in respect of the twin challenges of environmental sustainability of the energy use required by such growth and the removal of energy poverty, which have to be addressed in India's energy planning. The paper defines the concept of sustainable development and points out its resource accounting implications in respect of energy related resource use. It focuses in this context on the instrumental role of the efficiency of energy use and energy supply, fuel composition and technology in determining the strength of the linkage between the GDP growth and the growth of energy use and that between the energy use and the pollution intensity of energy. The paper also defines, on the other hand, the notion of energy poverty and discusses the problem of equity and energy development in a dual society like that of India. It then reviews the past trend and pattern of energy use and the future projections of energy requirement and supply with special reference to the twin issues of equity and environmental sustainability. In this context it makes a decomposition analysis of the past energy use and CO2 emissions in India for examining its environmental sustainability and if economic reforms of India could make any impact on it. It makes further a brief review of the methodologies of projections and policy planning for the future energy sector development in India as existing in the recent literature. Finally, the paper discusses certain selected issues of energy security and macroeconomic viability of such energy development in the background of the sustained steep rise of oil prices and high cost of carbon free new technologies. It concludes by highlighting certain policy issues relating to pricing, technology and institution for the attainability of inclusive growth and particularly for meeting the gaps in such attainment that would possibly remain as per the existing alternative projections for the future. However, this paper does not pay any special attention to the climate change related global policy issues that would affect India and gives priority to the national level issues relating to energy equity and energy related environmental sustainability of Indian development.
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
A sequence modeling approach for structured data extraction from unstructured text
No full textExtraction of structured information from unstructured text has always been a problem of interest for NLP community. Structured data is concise to store, search and retrieve; and it facilitates easier human & machine consumption. Traditionally, structured data extraction from text has been done by using various parsing methodologies, applying domain specific rules and heuristics. In this work, we leverage the developments in the space of sequence modeling for the problem of structured data extraction. Initially, we posed the problem as a machine translation problem and used the state-of-the-art machine translation model. Based on these initial results, we changed the approach to a sequence tagging one. We propose an extension of one of the attractive models for sequence tagging tailored and effective to our problem. This gave 4.4% improvement over the vanilla sequence tagging model. We also propose another variant of the sequence tagging model which can handle multiple labels of words. Experiments have been performed on Wikipedia Infobox Dataset of biographies and results are presented for both single and multi-label models. These models indicate an effective alternate deep learning technique based methods to extract structured data from raw text.</p
Vortex imaging: new information gain from tracking cardiac energy loss
No full textEditorial on the manuscript: Stugaard M, Koriyama H, Katsuki K, Masuda K, Asanuma T, Takeda Yet al. Energy loss in the left ventricle obtained by vector flow mapping as a new quantitative measure of severity of aortic regurgitation. a combined experimental and clinical study. EurHeart J, Cardiovasc Imag 2015; (same issue)
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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