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 86 for “"long-term study"”.
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EI Eridani and the art of doppler imaging : a long-term study
Das Verständnis magnetisch verursachter Aktivität auf Sternen sowie der zugrundeliegenden Dynamoprozesse ist von fundamentaler Bedeutung für das Verständnis von Entstehung und Entwicklung von Sternen sowie des Lebens im Universum. Sichtbare Erscheinungen dieser stellaren Aktivität sind u.a. …
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A long-term study of educational robotics and achievement in math and science
… studies lack strong controls and focus on short-term effects, while the programs they investigate have few contact hours and do not have a consistent curriculum. This situation indicates that more research is needed. This work focuses on a public high school in Texas with a year-long robotics …
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Changes in Integumental Dimensions of the Face Following Orthodontic Treatment: A Long-term Study
… in adults have relied on cross-sectional data. Longitudinal studies in this area are scarce because it is difficult to collect data on adults across time and because the changes are less dramatic than during childhood or adolescence. An interesting sample exists in the Charles H. Tweed …
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French osteotomy for cubitus varus in children: a long term study over 27 years
Background: Cubitus varus is a cosmetically unacceptable complication of supracondylar fractures of the elbow in children. We have performed the lateral closing wedge (French) osteotomy to correct the varus for 27 years. More complex osteotomies have been described to correct the associated …
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Cephalometric Analysis of Soft Tissue Profile Change Associated with Orthodontics and Orthognathic Surgery : A Long-Term Study
<p>The purpose of this study was to determine the effect of combined orthodontic and orthognathic surgical treatment upon the soft tissue profile, and to determine the correlation between soft tissue response and the following variables: type of surgery, genioplasty, lip thickness, method of …
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Histologic evaluation of calcium phosphate coated endosseous implants prepared by spark discharge oxidation : a long-term study in the sheep
The present study was designed to evaluate the in vivo degree of bone apposition of experimentally coated endosseous implants. Cylindrical rods of commercially pure titanium were prepared by means of electrochemical spark discharge oxidation. The created highly textured titanium oxide layers of two …
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West Nile Virus Seroreversion and the Influence of Herd Immunity on Disease Risk in a Long-term Study of Free-ranging Birds
… hosts. The quantity of susceptible hosts is determined by 1) recruitment of juvenile birds during the breeding season, 2) adult birds previously unexposed to WNV, and 3) adult birds with waning antibody titers. Although rarely tested, avian herd immunity and seroreversion could have a direct …
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Long-Term Study of Prescribed Fire Effects on Stand Dynamics and Oak Regeneration Potentials in Degraded Upland Oak-Hickory Stands in Northwestern Arkansas
… species. Forest health disturbances along with the implementation of a single dormant season burn, reduced overall overstory basal area, while improving overall crown health conditions and increased oak sapling and seedling densities compared to pre- treatment values. Prescribed fire …
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Design and development of a tractor-mounted, recording penetrometer
As part of a long term study dealing with the effect of continuous use of no-till practice on soil structural characteristics, this study was conducted with the following objectives: (i) to design and develop a tractor-mounted, hydraulically-operated, recording penetrometer, (ii) to collect the …
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Long term nitrate removal in a denitrification wall
… years in Iowa, and 15 years in Canada; however, long-term data on the efficacy of denitrification walls remain limited. In order to understand how these systems function in the long term, the performance of a New Zealand denitrification wall installed in 1996 was examined. Field sampling was …
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Änderung der Nierenfunktion bei Patienten mit primär maligner Hypertonie und sekundär maligner Nephrosklerose im Vergleich zu Patienten mit Glomerulonephritis
… loss of kidney function. In this retrospective long-term study, the kidney function of patients with malignant hypertension and resulting secondary malignant neprhosklerosis was compared to the kidney function of patients with glomerulonephritis and secondary hypertonicity, focusing on the …
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Short-term Athletic Foreign Tours and Student Learning Outcomes: A Program Evaluation
… the same student learning outcomes observed in long-term study abroad can be met during short-term programs, if executed correctly. Intercollegiate athletic foreign travel tours (AFTs) are similar to short-term study abroad programs, but little research has been done on these programs. By …
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Vegetation community development after dam removal on the Elwha River
… in the world to date and serves as a case study for the ecological effects of large dam removal. The 2012-2014 removal of two dams on the Elwha River exposed a cumulative 2.76 km2 of previously inundated surfaces. Environmental conditions including sediment texture and nutrients, …
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Effects of heat stress and fescue toxicosis on the immune system and other physiological parameters
… system when consumed by animals . Our first study showed that sensitizing rats helped them adapt to the toxin by maintaining a lower core body temperature on subsequent exposure. The short-term study showed an increased proinflammatory response to stimulation with bacterial toxins. In the …
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Parallelization of ECG template-based abnormality detection
… to develop techniques to predict cardiac arrest, long-term study of electrocardiogram (ECG) data needs to be done to detect changes in electrical activity of diseased hearts. In the past, limitations of computing power and storage space restricted the duration of long-term studies to several days. …
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Implantologische und prothetische Überlebens- und Erfolgsraten beim teilbezahnten Patienten : eine prospektive Langzeitstudie mit 3i-Implantaten über 5 Jahre
… nach 1, 2, 3, 4 und 5 Jahren. Bei den Kontrollterminen wurden standardisierte Zahnfilme angefertigt. <br>9 Implantate gingen vor Belastung verloren und 6 nach prothetischer Versorgung. Somit gingen 15 Implantate während der Untersuchung verloren, 30 Implantate wurden aufgrund eines radiologisch …
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Efekt konzumace jednoduchých cukrů na kognitivní funkce potkaních samic
… water or with isocaloric fructose solution in a long-term study (7 months), simulating the chronic consumption of sugars in humans. Plasma parameters and expression of proteins, involved in metabolic pathways, were determined in the frontal cortex. Cognitive functions were evaluated through the …
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Population Dynamics of Copepoda and Cladocera in an Iowa farm pond, Summer 1973
… It would be necessary to conduct a long term study of the same pond so that a complete understanding could be obtained of development, growth. and extinction of the various populations. For a complete understanding of the zooplankton community, techniques involving evaluations of …
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Assessment and Characterization of Microbial Communities in Salt Affected Soils on Galveston Island
… elevated sodium concentrations. As part of a long-term study that aims to restore plant life to the island, various soil amelioration techniques are being evaluated. Samples from bedded and non- bedded plots treated with gypsum, mulch, or both were assessed for microbial populations. Samples …
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