288 research outputs found
Terascale direct numerical simulations of turbulent combustion – fundamental understanding towards predictive models
No full textAdvances in high-performance computational capabilities enable scientific simulations with increasingly realistic physical representations. This situation is especially true of turbulent combustion involving multiscale interactions between turbulent flow, complex chemical reaction, and scalar transport. A fundamental understanding of combustion processes is crucial to the development and optimization of next-generation combustion technologies operating with alternative fuels, at higher pressures, and under less stable operating conditions, such as highly dilute, stratified mixtures. Direct numerical simulations (DNS) of turbulent combustion resolving all flow and chemical features in canonical configurations are used to improve fundamental understanding of complex flow processes and to provide a database for the development and validation of combustion models. A description of the DNS solver and its optimization for use in massively parallel simulations is presented. Recent DNS results from a series of three combustion configurations are presented: soot formation and transport in a nonpremixed ethylene jet flame, the effect of fuel stratification in methane Bunsen flames, and extinction and reignition processes in nonpremixed ethylene jet flames
The Phil Rogers Russell, D.O. Collection
No full textFinding aid for The Phil Rogers Russell, D.O. CollectionPhil Rogers Russell, D.O., practiced osteopathic medicine in the state of Texas from his 1917 graduation from the American School of Osteopathy, Kirksville, Missouri, until his death at the age of 80 in 1975. He was a strong supporter of the profession and was instrumental in the establishment and growth of the Fort Worth Osteopathic Hospital and the Texas College of Osteopathic Medicine. He won numerous awards and honors from the American Osteopathic Association, the Texas Osteopathic Association, other osteopathic institutions and associations, and civil awards. He was the author of "Quack Doctor", a memoir of his years as an osteopathic physician.The Phil R. Russell, D.O. Collection consists of speeches, articles, book manuscripts, books, memorabilia, photographs, certificates and awards that Dr. Russell authored or was presented during his lifetime
Distributed secondary gas injection via a fractal injector: A nature-inspired approach to improving conversion in fluidized bed reactors
No full textThe conversion in bubbling fluidized bed reactors is suppressed because the interphase mass transfer and gas-solid contact in bubbling fluidized bed reactors are often poor. Most of the gas is present in the form of bubbles, which have low surface-to-volume ratios and are nearly devoid of catalyst particles. The chaotic behaviour of the bubbles is difficult to predict and can change with reactor size, making scale-up very difficult. The work in this thesis presents a novel approach to overcoming these difficulties in bubbling fluidized beds. Nature uses branching, fractal structures, which greatly facilitate mass transfer in natural systems, such as trees and lungs. These structures scale easily, which is a very important feature as the organism grows. This approach can also be applied to fluidized beds. A fractal injector was developed for both quasi 2-D and 3-D beds to distribute a portion of the total gas flow throughout the fluidized bed. To determine the effect of this distributed secondary gas injection on the properties of a gas-solid fluidized bed, the study is split into four topics: the effect on the hydrodynamics of the fluidized bed, the mechanisms leading to the observed changes in the hydrodynamics, the residence time and macroscopic mixing of the gas, and the influence on the performance of the reactor. The results indicate that secondary gas injection via a fractal injector effectively reduces the bubble diameter by up to 30% (~70% reduction in the volume) and increases the gas-solid contact. It is shown that these effects lead to a higher conversion and selectivity in a bubbling fluidized bed reactor. Mechanisms for these effects are proposed.Applied Science
Trends in Osteopathic Authorship in Orthopedic Publications and Its Impact on Adult Reconstruction Match Rates
No full textBackground: Doctors of osteopathy (D.O.) have historically been underrepresented in the orthopedic literature. As adult reconstruction (AR) continues to rank among the most competitive orthopedic fellowships, participation in research likely serves a key role for successfully matching. This study sought to identify trends in D.O. orthopedic publications and assess for correlations between these trends and osteopathic AR match results. Methods: The top 10 orthopedic surgery journals based on impact factor were selected for analysis. Articles published between 2010 and 2021 were screened to assess for publications with a D.O. author, as well as authorship position. A total of 29,499 articles were available for final analysis. Data from the San Francisco Residency and Fellowship Match Services were also reviewed to evaluate the number of osteopathic applicants and their match rates during the same study period. Trends in D.O. publications and osteopathic AR match rates were then assessed for any correlations. Results: From 2010 to 2021, there was a significant increase in orthopedic and arthroplasty-related publications with a D.O. author (P < .0001), as well as D.O. first (P = .0006) and senior authorship positions (P = .009). Osteopathic match rate significantly increased during the study period (P = .003). There was a strong correlation between the increase in osteopathic match rate and arthroplasty-related publications with a D.O. author (r = 0.76). Conclusions: From 2010 to 2021, there was an upward trend of osteopathic orthopedic publications. This increase is strongly correlated with an increase in osteopathic AR match rate. Our findings suggest that authorship in publications may play a key role in successfully matching into an AR fellowship
Correction to: A multi-center analysis of adverse events among two thousand, three hundred and seventy two adult patients undergoing adult autologous stem cell therapy for orthopaedic conditions
No full textThe published online version contains mistake in Acknowledgment Section. The author name "Steve Gorin, M.D." should have been "Steven Gorin, D.O, M.S.Ed."
A manual of photographic chemistry : including the practice of the collodion process /
No full textIncludes index.Mode of access: Internet.nding: blind tooled cloth boards; stamp of D.O. Cauldwell on front pastedown and front free endpaper and an ink inscription possibly by him on front pastedown
Geographic profiling in Nazi Berlin: fact and fiction
No full textGeographic profiling uses the locations of connected crime sites to make inferences about the probable location of the offender’s ‘anchor point’ (usually a home, but sometimes a workplace). We show how the basic ideas of the method were used in a Gestapo investigation that formed the basis of a classic German novel about domestic resistance to the Nazis during the Second World War. We use modern techniques to re-analyse this case, and show that these successfully locate the Berlin home address of Otto and Elise Hampel, who had distributed hundreds of anti-Nazi postcards, after analysing just 34 of the 214 incidents that took place before their arrest. Our study provides the first empirical evidence to support the suggestion that analysis of minor terrorism-related acts such as graffiti and theft could be used to help locate terrorist bases before more serious incidents occur
Theoretical studies of the historical development of the accounting discipline: a review and evidence
No full textMany existing studies of the development of accounting thought have either been atheoretical or have adopted Kuhn's model of scientific growth. The limitations of this 35-year-old model are discussed. Four different general neo-Kuhnian models of scholarly knowledge development are reviewed and compared with reference to an analytical matrix. The models are found to be mutually consistent, with each focusing on a different aspect of development. A composite model is proposed. Based on a hand-crafted database, author co-citation analysis is used to map empirically the entire literature structure of the accounting discipline during two consecutive time periods, 1972–81 and 1982–90. The changing structure of the accounting literature is interpreted using the proposed composite model of scholarly knowledge development
Optimization of the Al-Shaheen Field Performance using Smart Well Technology
No full textThis MSc thesis reports the results on optimizing the Al-Shaheen field performance using smart well technology. The field is currently being developed by Maersk Oil and Gas (MOG) offshore Qatar, using large-scale water injection on very long horizontal wells. The studied reservoir consists of a laterally uniform, tight matrix. However, undesired water short-circuiting between injectors and producers due to localized heterogeneity leads to reduced sweep efficiency and increased water production, thereby reducing the economic life of approximately 10% of the wells. Smart well technology combines monitoring and control capabilities with multi-segment completions in order to optimize flooding mechanisms. In this study two different optimization strategies were simulated on a sector model containing different level of heterogeneity. The first method comprised a reactive, measurement-based approach, where injection segments were shut-in when increased water production was observed in production segments. The second method comprised a proactive, model-based approach where the optimal shut-in timing of injection segments was obtained from gradient information. The evaluated flooding mechanisms include water injection and Water-Alternating-Gas (WAG) injection. Results show optimization with smart well technology can significantly improve recovery and reduce water and gas circulation under varying conditions of reservoir heterogeneity. The measurement-based optimization confirms that the technology can improve reservoir engineering by its increased downhole monitoring capabilities. Results from measurement-based optimization approach the optimum found by model-based optimization.Section Petroleum EngineeringCivil Engineering and Geoscience
Oregon Health Authority - Highway 36 public health assessment
No full textprepared by the Environmental Health Assessment Program, Oregon Health Authority, Public Health Division ; authors: Sujata Joshi, MSPH, Epidemiologist, David Farrer, Ph.D., Toxicologist, Jae P. Douglas, MSW, Ph.D., Principal Investigator, Administrator, Center for Prevention and Health Promotion, Karen Bishop, MPH, Public Health Educator, Matthew Dubrow, D.O, Preventive Medicine Resident.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 59-62).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
- …
