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Effect of changing the stroke on air capacity, power output and detonation of a single-cylinder engine

Description: Report presenting an investigation of a special single-cylinder test engine constructed with provision for operation with three different lengths of piston stroke. Results regarding the air capacity of the engine, extent to which the spark must be retarded in order to prevent detonation, and brake mean effective pressure are provided.
Date: February 1945
Creator: Livengood, James C. & Eppes, James V. D.
Partner: UNT Libraries Government Documents Department

The effect of inlet-valve design, size, and lift on the air capacity and output of a four-stroke engine

Description: Report presenting a series of performance tests made with a CFR engine at constant inlet pressure and temperature and constant exhaust pressure. Special cylinder heads with different sizes and designs of inlet valve and port were used.
Date: November 1943
Creator: Livengood, James C. & Stanitz, John D.
Partner: UNT Libraries Government Documents Department

Scavenging a piston-ported two-stroke cylinder

Description: An investigation was made with a specially designed engine to determine the scavenging characteristics of a large number of inlet-port shapes and arrangements and the optimum port arrangement and timing for this particular type of engine. A special cylinder construction permitted wide variations in timing for this particular type of engine. A special cylinder construction permitted wide variations in timing as well as in shape and arrangement of both the inlet and exhaust ports. The study of the effect of port shape combinations and timings on engine performance was made using illuminating gas as a fuel. Through variations in inlet-port arrangement and port timings, the value of the scavenging efficiency was increased from an original 44 percent to approximately 67 percent with a corresponding increase in power. With the optimum port arrangement and timing determined, a large number of performance runs were made under both spark-ignition and compression-ignition operation.
Date: November 1938
Creator: Rogowski, A. R. & Bouchard, C. L.
Partner: UNT Libraries Government Documents Department

Two-Stroke-Cycle Engines for Airplanes

Description: Now that the two-stroke-cycle engine has begun to make its appearance in automobiles, it is important to know what services we have a right to expect of it in aeronautics, what conditions must be met by engines of this type for use on airplanes and what has been accomplished.
Date: January 1926
Creator: Jalbert, J.
Partner: UNT Libraries Government Documents Department

Power Output and Air Requirements of a Two-Stroke Cycle Engine for Aeronautical Use

Description: This investigation was undertaken to determine the pressure and amount of air necessary for satisfactory high-speed, two-stroke cycle operation and thus permit the power requirements of the air pump or blower to be determined. Based on power output and air requirement here obtained the two-stroke cycle engine would seem to be favorable for aeronautical use. No attempts were made to secure satisfactory operation at idling speeds.
Date: 1927
Creator: Paton, C. R. & Kemper, Carlton
Partner: UNT Libraries Government Documents Department

Morphology and cardiac physiology are differentially affected by temperature in developing larvae of the marine fish mahi-mahi (Coryphaena hippurus)

Description: This article investigates the influence of water temperature on cardiac plasticity in developing mahi-mahi.
Date: April 18, 2017
Creator: Perrichon, Prescilla; Pasparakis, Christina; Mager, Edward M.; Stieglitz, John D.; Benetti, Daniel D.; Grosell, Martin et al.
Partner: UNT College of Arts and Sciences

Heat-Related Deaths

Description: "This indicator presents data on deaths classified as 'heat-related' in the United States."
Date: August 2016
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Harbor: The Act of Autobiography

Description: This written thesis accompanies a sixteen-minute documentary video, Harbor, in which the filmmaker explores her relationship with her father who has suffered a stroke. Detailed accounts of the pre-production, production and post-production of the video allow the reader to understand the challenging and rewarding process of making an autobiographical documentary. Theoretical issues are also discussed, including the validity, criticisms, artistic nature and ethical concerns of autobiographical filmmaking. The filmmaker stresses the universality of her story, and how, despite the film's very personal nature, it is applicable for anyone who has dealt with the illness and/or disability of a parent.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: August 1999
Creator: Doeren, Catherine Wallace
Partner: UNT Libraries

Heat-Related Illnesses

Description: "This indicator tracks how often people are hospitalized because of exposure to heat."
Date: August 2016
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Limiting Disability Post-Brain Injury Through a Physical Activity Centered Education Program

Description: Brain injury (i.e., traumatic brain injury, stroke) is a considerable public health issue due to complicated outcomes of the injury, increasing incidence, and high costs linked with medical treatment. Rehabilitation centers are challenged to help individuals manage the resultant associated conditions and prevent secondary and chronic conditions. Research has shown that health promotion programs (HPP) that incorporate education about physical activity (PA) are one mode of rehabilitation that can improve the health of individuals with disabilities. However, PA is not included in the rehabilitation program for individuals with a brain injury, indicating a gap in the services provided. Consequently, the purpose of this study was to create and implement a physical activity centered education (PACE) program within an outpatient rehabilitation program. PACE consisted of an 8-week (16 session) program which aimed to (1) increase PA self-efficacy, (2) increase intention to change PA behaviors, (3) increase amount of PA completed regularly, and (4) promote positive rehabilitation outcomes. Based on previous research it was hypothesized that participation in PACE would result in (1) increased PA self-efficacy, (2) forward progression in intention to change PA behaviors, (3) increased amount of PA completed, and (4) improved rehabilitation outcomes (i.e., abilities, adjustment, participation). The PACE program resulted in an average increase of 16.1% in participants’ PA self-efficacy (effect size [ES] = 0.41), an increase from three of nine participants at pre-test to six of nine participants at post-test reporting to be in a stage of change in which they are most likely to be successful in regular PA participation (i.e., action or maintenance), and a comparable improvement in MPAI-4 scores (rehabilitation outcomes) after discharge to a rehabilitation program without a PA education component. In conclusion, the PACE program can improve PA self-efficacy, intention to change PA behaviors, and short-term rehabilitation outcomes.
Date: August 2011
Creator: Irwin, Kelley
Partner: UNT Libraries

Summary and Evaluation of NRC-Sponsored Stellite 6 Aging and Friction Tests

Description: This report describes four sets of tests sponsored by the U.S. Nuclear Regulatory Commission and conducted by the Idaho National Engineering and Environmental Laboratory. The tests support research addressing the need to provide assurance that motor-operated valves are able to perform their intended safety function, usually to open or close against specified (design basis) flow and pressure loads. One of the parameters that affects a gate valve's operability is the friction between the disc seats and the valve body seats. In most gate valves, these surfaces are hardfaced with Stellite 6, a cobalt-based alloy. The tests described in this report investigate the changes that occur in the friction as the Stellite 6 surfaces develop an oxide film as they age. Stellite 6 specimens were aged in a corrosion autoclave, the oxide films were examined and characterized, and the specimens were subjected to friction testing in a friction autoclave. A very thin oxide film formed after only a fe w days of natural aging. Even a very thin oxide film caused an increase in friction. The surface structure of the oxide film was dominated by a hard crystalline structure, such that the friction response was analogous to rubbing two pieces of sandpaper together. In the limited data provided by naturally aged specimens (78 days maximum exposure, very thin oxide films), the friction increased with greater aging time, approaching an as-yet-undetermined plateau. Although the thickness of the oxide film increased with greater aging time, the mechanical properties of the oxide film (larger granules with greater aging time) appeared to play a greater role in the friction response. Friction testing of specimens subjected to simulated in-service testing strokes at intervals during the aging process showed only a slight decrease in friction, compared to other specimens. Results from specimens subjected to accelerated aging were ...
Date: April 1, 1999
Creator: Watkins, J. C.; DeWall, K. G. & Bramwell, D.
Partner: UNT Libraries Government Documents Department

Aligning ontologies and integrating textual evidence for pathway analysis of microarray data

Description: Expression arrays are introducing a paradigmatic change in biology by shifting experimental approaches from single gene studies to genome-level analysis, monitoring the ex-pression levels of several thousands of genes in parallel. The massive amounts of data obtained from the microarray data needs to be integrated and interpreted to infer biological meaning within the context of information-rich pathways. In this paper, we present a methodology that integrates textual information with annotations from cross-referenced ontolo-gies to map genes to pathways in a semi-automated way. We illustrate this approach and compare it favorably to other tools by analyzing the gene expression changes underlying the biological phenomena related to stroke. Stroke is the third leading cause of death and a major disabler in the United States. Through years of study, researchers have amassed a significant knowledge base about stroke, and this knowledge, coupled with new technologies, is providing a wealth of new scientific opportunities. The potential for neu-roprotective stroke therapy is enormous. However, the roles of neurogenesis, angiogenesis, and other proliferative re-sponses in the recovery process following ischemia and the molecular mechanisms that lead to these processes still need to be uncovered. Improved annotation of genomic and pro-teomic data, including annotation of pathways in which genes and proteins are involved, is required to facilitate their interpretation and clinical application. While our approach is not aimed at replacing existing curated pathway databases, it reveals multiple hidden relationships that are not evident with the way these databases analyze functional groupings of genes from the Gene Ontology.
Date: October 8, 2006
Creator: Gopalan, Banu; Posse, Christian; Sanfilippo, Antonio P.; Stenzel-Poore, Mary; Stevens, S.L.; Castano, Jose et al.
Partner: UNT Libraries Government Documents Department

[News Clip: Dapper Bandit]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date: October 21, 1988, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections