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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 22 for “"dry ice"”.
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Geometry optimization of dry ice blasting nozzle for the noise reduction using experimental validation
Dry ice blasting provides many advantages to surface cleaning in which the blasting medium sublimate during the surface impact will not leave a secondary contamination. However, on the negative side of dry ice blasting (DIB), it produces a high noise exposure. The noise exposure during a high …
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Birch reduction of benzamide, m-methoxy-benzamide and terephthalic acid
… experimental procedures for Birch reduction at dry-ice temperature (-65 to -78°C), benzamide was reduced to 1,4-dihydrobenzamide: (a) By using Niem’s procedure (27), with lithium and ethanol in liquid ammonia at dry-ice temperature and where ethanol was added slowly after lithium addition, …
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Effect of transport methods on recovery of bacteria from ground beef samples
… using an appropriate, pre-chilled container with dry ice as the temperature contro11ant resulted in a significant1y higher (P ~ 0.01) survival rate of Clostridium perfringens vegetative cells in ground beef samples as compared to survivals in samples shipped in Trans Temp containers using …
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The behaviour of gas-emitting particles in fluidised beds
… spheres of devolatilising biomass, spheres of dry ice, sublimating in a hot fluidised bed were used, because dry ice emits a single, readily detectable gas. The spheres of dry ice were, however, much denser than any biomass fuel and so only segregated once the rate of sublimation was very high. …
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Realizing a design for a cloud chamber cooled by thermoelectric modules
… chambers require the use of material such as dry ice to induce surface temperatures below -26° C. Cooling a surface below this threshold enables the formation of super-saturated vapors of fluids such as isopropyl alcohol, which is used in this experiment. In order to address the problems with …
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Thermal Drilling and Anchoring on Icy Planetary Bodies
… drilling process to burrow into Europa’s surface ice and then serves as an anchor, supporting the mobility of the rover to which it is attached. Thermal drilling provides high reliability but can be energetically costly. An intermittent thermal drilling approach was developed that dramatically …
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Characteristics of the Recovery of the Coenzyme A-Synthesizing Protein Complex from Saccharomyces Cerevisiae
… formed by exposing the yeast cell to ether and dry ice. Only after solubilization has this multienzyme complex been shown to catalyze the formation of bound dephospho-CoA utilizing the substrates adenosine triphosphate, D-pantothenic acid and L-cysteine. A low molecular weight component or …
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Analysing aspects of the performance of an ironblast furnace
… model of the raceway was developed, using dry ice particles to simulate the packed bed. The sublimation properties of the ice give a more realistic simulation to coke combustion, compared to the use of inert particles. The results of the experiment brought to light the effects of …
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An Investigation of the Reaction of Ozone with Barium Peroxide and Barium Hydroxide
… were reacted with ozone while being cooled with dry ice and acetone. There has been no work done on the composition of these compounds because they decompose as soon as they are removed from the cooling bath. |The purpose of this investigation was to study the effect of ozone on anhydrous barium …
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Cryogenic penetration and relaxation behavior of dry and icy lunar regolith simulants
… in space – from platinum-group metals to water ice – has permeated space-focused media, culminating with the establishment of a price for water delivered in low-earth orbit. Much of the discussion about space resources focuses on the potential of regolith (extraterrestrial soil) to provide …
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Kryokonservierung von hepatischen Sternzellen der Ratte
… The cryopreservation and the exchange on dry ice could be a practical solution. Therefore a successful proceeding for the longtime storage of HSC was developed. Many parameters has been examined for example the freezing rates, the prefreeze processing the different cryoprotectants, the …
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EFFECT OF DIETARY GLYCOMACROPEPTIDE AND CHOLESTEROL ON CORTICAL GANGLIOSIDE- AND GLYCOPROTEIN-BOUND N-ACETYLNEURAMINIC ACID IN YOUNG RATS
… to the sialic acid-supplemented diets and sacrificed on P32. In the second experiment, litters were weaned on P21 to the diet of their dams. Pups consumed the dams’ diets until P24 or P33 and their assigned sialic acid-supplemented diets thereafter. The pups were sacrificed between P38 and P47, …
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Cryogenic penetration and relaxation behavior of dry and icy lunar regolith simulants
… in space – from platinum-group metals to water ice – has permeated space-focused media, culminating with the establishment of a price for water delivered in low-earth orbit. Much of the discussion about space resources focuses on the potential of regolith (extraterrestrial soil) to provide …
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Adsorption at Treated Steel-Paint Interfaces
… steel substrates can be modelled. A dry ice-garnet mixed stream is also investigated to see whether abrasive residue could be reduced. It is found that a quarter of the steel surface is covered with blasting residue. However, cooling and moisture-condensation leads to corrosion spots …
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Prevention, Control and Eradication of Aquatic Invasive Species
… of many proposed spread-prevention practices are frequently inhibited due to low practicality, high expense, undesirable non-target effects and a lack of known efficacy. Similarly, as suppression techniques are not always successful, or necessarily suitable for all field scenarios, there …
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Impact of impurities on thermo-physical properties of CO2-rich systems : experimental and modelling
… CO2 pipelines and the possibility of solid or ‘dry ice’ discharge during an accidental release or rapid decompression. The frost points of some of the above systems were measured using the SETARAM BT 2.15 calorimeter at various pressures.
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Design, modeling and construction of a novel ablative fast pyrolysis reactor and product collection system
… was to have a nominal throughput of 10 kg/11r of dry biomass and be inherently scalable up to an industrial scale application of 10 tones/hr. The whole process consists of a bladed ablative pyrolysis reactor, two high efficiency cyclones for char removal and a disk and doughnut quench column …
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Self-organization in immiscible alloy systems under irradiation and severe plastic deformation
… determining when an alloy would fail under service, it would be best if it were possible to design an alloy which would simply never fail over its expected lifetime. To achieve this goal, research has been conducted in material science to better understand the fundamentals of driven materials. …
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Investigation into the Neurogenetics of Vocal Learning in Tursiops Truncatus, the Bottlenose Dolphin
… and the right hemisphere flash-frozen on dry ice. We utilized this protocol in collaboration with the NOAA stranding response network to opportunistically collect specimens from necropsy procedures. In this study, we demonstrated the feasibility of this methodology for collecting …
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