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 17 of 17 for “"airtight"”.
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The effect of oxidation-reduction potential on the outgrowth, toxin production, and chemical inhibition of Clostridium botulinum type A spores
… formation, and Eh7 changes were monitored in an airtight four necked flask containing electrodes for continuous measurement of Eh and pH and connections for the exchange and mixing of prepurified nitrogen and anaerobic carbon dioxide. Strict anaerobic procedures and prepurified media were …
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Comparison of Treatment Methods for Chronic Periapical Inflammatory Diseases // Сравняване на методи за лечение на хронични периапикални възпалителни заболявания
… to stimulate the healing process; to provide an airtight filling of the root canal to isolate the apical periodontium from contact with saliva in the oral cavity. The removal of the etiological factor is associated with mechanical and chemical treatment of the root canal. Since most endodontic …
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The removal of nitrogen and phosphorus in anoxic-aerobic digestion of waste activated sludge from biological nutrient removal systems
… digestion which is complex to operate requiring airtight containers with fire risk, heating and much recycling. In anoxic-aerobic digestion, the nitrogen is removed by nitrification-denitrification, which has the added advantages of reducing the digester's oxygen demand and recovering some of the …
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Design of an Experimental Mine Simulator for the Development of a Procedure for Utilization Multiple Tracer Gases in Underground Mines
… for the use of tracer gases by being both airtight and open-circuit (exhausting to the atmosphere) and by maintaining turbulent flow throughout the model, ensuring the tracer gas is fully dispersed. The model features ports for injection and sampling of tracer gases, which represent …
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Quantitative Analyse klappeninduzierter Mikroembolien mittels Doppler-Sonographie in vitro für gängige Herzklappenprothesen
… was investigated. Circulation was set up as a airtight circulatory mock loop using a cell-free filtered water-glycerol test fluid. Several prosthetic valve types were inserted in mitral position of a left ventricular assist device (MEDOS?). A pulsed ultrasound machine with a dual gated 2 MHz …
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Nonelectric, standalone heating element for an infant incubator
… melting temperatures of the wax and lack of airtight containers for the tests caused irregularities in the results. However, the simulations' behavior implicated two features the model should incorporate for future study: (1) the thermal resistance and temperature gradients within the air …
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Silicon-based pH sensor for biological and environmental applications
… for capacitance measurements, and ensuring airtight (PDMS) bonding with the device substrate, guaranteeing seamless solution delivery to the test chamber. It is our hope that future students are able to build upon these results and create a better, more reliable device.
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The Architecture of the Great House in the Contemporary Postcolonial Novel
… that the colonial power structures were never airtight and impervious but also that they still exist, even if in ruins, and must be dealt with. Bringing together novels set in diverse places exposes the continuing potency of the power structures erected through the colonial process while …
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Constraining air-sea equilibrium and biological end-members for marine gross productivity estimates using oxygen triple isotopes
… biological oxygen, gas from the headspace of airtight bottles with Picochlorum sp. and Emiliania huxleyi cultures was sampled every 48 hours during eight days, after which the triple oxygen isotopic composition was determined. Results indicate the 17O excess obtained for both species is in the …
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Analysis of the pressure-wall interaction at the release of a stop closure
… tip, or the tongue body, is raised to make an airtight closure. Stevens [I] pp 32 9-3 30 hypothesized that the interaction of the air pressure with the yielding soft-tissue wall would lead to a plateau-shaped release trajectory, and the duration of the plateau is progressively longer for …
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Expert Control Strategies for Solar Cooling systems
… insulation, reduction of thermal bridge, airtight façade components), minimizing solar gains in low latitudes or maximizing solar gains in high latitudes. In addition to passive solutions, a reduction of energy consumption may be achieved with active parts of a building, as space heating …
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Digital material skins : for reversible reusable pressure vessels
… to construct a functional structural skin for airtight,waterproof, high or low pressure applications.The surface is enclosed or the surface is open. Digital material skins are used to construct any shape or interior volume that is regular or amorphous. A digital material skin is an exterior …
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The effect of oxidation-reduction potential on the outgrowth and chemical inhibition of Clostridium botulinum type E spores
… botulinum type E spores was studied. An airtight flask containing electrodes for continuous measurement of Eh and pH and attached tubing for the exchange and mixing of various gases (i.e. prepurified nitrogen, anaerobic carbon dioxide, hydrogen, oxygen) were utilized. Prereduced media and …
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Developing energy-loss test techniques for large buildings.
… of the document was that a fan pressurisation airtightness performance assessment be made of the completed building envelope. For all non-domestic buildings with a gross floor area of greater than 1000m[2] an air leakage test would be required in accordance with CIBSE TM 23:2000 to prove that …
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Control of micro- and nanostructure: I. polymer gas chromatography microcolumns and II. applications of ultrasound
… and challenges with using a 3D printer to make airtight capillary channels. Spiral and serpentine column designs were made and tested. The microcolumns were printed using PLA as the substrate material and coated with OV-101. In a separation of a mixture of alkanes, one serpentine microcolumn …
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Konservierung von Rundholz unter Sauerstoffabschluss - Folienkonservierung
Der Rohstoff "Holz" ist vielfältigen Zersetzungsprozessen ausgesetzt, wenn er zwischengelagert werden muss. Dies kann der Fall sein nach Kalamitäten, wie beispielsweise Stürmen, aber auch zur Überbrückung zwischen winterlichem Holzeinschlag und der Weiterverarbeitung im Werk. Bisher stand der …
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Design strategies for residential ventilation systems
… concepts show superior optimal performance in airtight than in leaky conditions. Additionally, dedicated ventilation systems achieve 30-40% lower exposure at equal ventilation heat loss than leakage as a means of ventilation. Subsequently, the effectiveness of the different ventilation …