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 41 for “"Perforations"”.
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Clinical Characteristics and Patterns of Chronic Tympanic Membrane Perforations
고막 천공은 이비인후과 외래에서 비교적 자주 접할 수 있는 질환으로, 일반적으로 고막 천공의 크기가 큰 경우, 변연 천공인 경우, 또는 지속적인 감염의 경우에 만성화되는 경향이 있다. 고막의 재생 능력은 우수한 것으로 알려져 있지만 아직 그 기전이 명확히 밝혀져 있지는 않다. 따라서 본 연구는 만성 고막 천공의 유형과 특징을 분석하고 재생과정에서 보이는 경향에 대해 알아보고자 하였으며, 이러한 임상적 특징을 다른 동물 실험등과 비교하여 고막 재생 기전을 확립하고 새로운 재생 기술을 개발하고자 하였다. 본 이비인후과에서 …
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Personalized absorbable gastrointestinal stents for intestinal fistulae and perforations
Gastrointestinal (GI) tract perforations and obstructions are relatively frequent surgical emergencies, are potentially life-threatening, and can occur from several different sources. In general, treatment requires urgent surgical repair or resection and at times can lead to further complications. …
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Effects of Size on Ovoid Anterior Septal Perforations: Physiologic Modeling With Computational Fluid Dynamics
The general metadata -- e.g., title, author, abstract, subject headings, etc. -- is publicly available, but access to the submitted files is restricted to UT Southwestern campus access and/or authorized UT Southwestern users.
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Effects of tympanic-membrane perforations on middle-ear sound transmission : measurements, mechanisms, and models
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1998.
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Development of New Regeneration Methods in Animal Models with Chronic Tympanic membrane Perforations Using Tissue Engineering Techniques
… of TM regeneration in both acute and chronic perforations. 3) And we also developed new regeneration methods to treat CTMPs. For the first purpose, nine methods were applied to 100 Sprague-Dawley rats; I) simple perforation, II) mitomycin C (MC) gelfoam for 10min, III) MC for 10min with saline …
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Elastic buckling solutions for thin-walled metal columns with perforation patterns
… with perforation patterns. The influence of perforations is accounted by reduced thicknesses related to the plate buckling coefficient and transverse web rotational stiffness in the prediction of local and distortional buckling respectively. Global buckling prediction including the influence …
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Morphogenesis of the early post-implantation mouse embryo
… perforated during the implantation stages. These perforations are initially evenly distributed and then accumulate asymmetrically at the future posterior part of the embryo, just prior to gastrulation. Finally, I demonstrate that remodelling of the basement membrane requires the expression of …
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Development of water-insoluble chitosan patch scaffold for regeneration of tympanic membranes
… TMs out of 19 adult rats with CPSs showed no perforations at 1 and 2 weeks, respectively. However, left control TMs showed healing of 0 (0%) at 1 week and 18 (94.7%) at 2 weeks. Transmission electron microscope findings of regenerated TM using CPSs showed thinner, smoother, and more compact …
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Optimisation of Hall cross devices towards magnetic particle counting
… It is hypothesised that the inclusion of perforations within the active area of such devices could make the Hall cross insensitive at locations where the stray field components of a landing magnetic particle reduce the overall Hall signal, thus enhancing the response. This concept is …
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The role of helicobacter pylori infection in adults presenting with spontaneous gastroduodenal perforation at the University Teaching hospitals, Lusaka Zambia.
… presenting with spontaneous gastroduodenal perforations at the University Teaching Hospitals (UTH), Lusaka, Zambia. This was a cross-sectional study carried out in patients aged 18 years or above who presented to the surgical department of UTH with gastroduodenal perforation between June …
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The role of helicobacter pylori infection in adults presenting with spontaneous gastroduodenal perforation at the University Teaching hospitals, Lusaka Zambia.
… presenting with spontaneous gastroduodenal perforations at the University Teaching Hospitals (UTH), Lusaka, Zambia. This was a cross-sectional study carried out in patients aged 18 years or above who presented to the surgical department of UTH with gastroduodenal perforation between June …
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Modeling and design of perforated prosthetic sockets ARCHM to increase heat transfer of residual limbs
… With the addition of small holes, or perforations, in the socket, there will be an increase in the heat transfer by convection, while still maintaining the strength of a carbon fiber prosthesis. Through the use of discrete approximation modeling, the transient temperature inside of the …
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Growth and Deterioration
… open to expose their interior. The tearing and perforations on the surface of each piece are employed to emphasize deterioration. In opposition to the tearing and perforations, I also add concave lines to the surface creating a flowing moving force. The surface is both visually active and …
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The production of stone beads at the pre-pottery neolithic site of el-Hemmeh, Jordan
… reconstructed based on the close examination of perforations, polishing, and tool marks on ten PPNA beads carefully selected as case studies. The typology of PPN stone beads at el-Hemmeh falls into place with a regional range of shapes and sizes, although I propose here the establishment of a …
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Daily migrations in a shifting landscape: Facilitating a circular economy on the south peninsula
… across planning divides through walkable perforations of hard urban divisions. It improves resilience through a network of safe public spaces within effective lighting and activation for around the clock utility. The project also provides dignified access to sanitation, waterpoints, …
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Design and control of a mobile light ballet platform
… perforated box. Light escapes through the perforations and creates a display of lights on surrounding surfaces. This thesis documents the process of transforming the generally stationary art display into a mobile exhibit. The light ballet modules will be placed on a mobile platform driven …
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Toward a micro-scale acoustic direction-finding sensor with integrated electronic readout
… fabricated structures. It is also shown that perforations in the sensor’s structure have no effect on curvature. The results presented here provide several essential tools for the continued development of the MEMS acoustic direction-finding sensor.
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A Study Of Intermittent Convective Heating Effects On Fine Fuel Ignition
… After acoustically stimulating a long tube with perforations at the top, creating a pulsed linear flame, thin fuels with different densities and diameters are quickly placed in the center of the flame. The temperature of these fuels is measured using an infrared camera, distinguishing the …
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An urban infill : a residual site in Boston
… the established city datum, has resulted in deep perforations of the city skin and it has caused discontinuity in the urban fabric. The result is the formation of "leftover" sites in the city which are devoid of life. The proposed solution involves the study of a possible way to span the highway …
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Hydrodynamic loading of a porous plate at low Reynolds number conditions
… loading on the size and shape of the perforations in the disk using a parameter called drag ratio, which compares the magnitudes of drag that porous and impermeable disks experienced. These experiments were conducted using a displacement controlled experimental apparatus, which, to the …
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