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 111 for “"pH-value"”.
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Untersuchungen zur Sorption von Innenraum-Luftschadstoffen durch Wolle
… of several aldehydes were examined. The emphasis of the investigation is on formaldehyde as the most important and most frequent aldehyde occurring in interiors. Under static conditions of 22°C wool takes up large quantities of formaldehyde from the gaseous phase. The sorption follows a …
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Preparation and characterisation of poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads for the chromium (VI) (Cr(VI) removal
… transform infrared spectroscopy (FTIR) analysis. pH value for each sample before and after the absorption test also has been measured. As a result, the data obtained by AAS showed that the Cr(VI) solution of PVA/CS/SiO2 beads of PCS 25 recorded the most percentage of Cr(VI) absorption which was …
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An investigation of corrosion mechanisms of constructional alloys in supercritical water oxidation (SCWO) systems
… Corrosion in aqueous feed streams of ambient pH values of 2, 1 and 7 is studied both at supercritical (-425⁰C) and subcritical (-300-360⁰C) temperatures with a constant pressure of 24.1MPa. Dealloying of Ni and Fe, and oxidation of Cr and Mo are observed at subcritical temperatures at a pH …
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Análise da Utilização de Produtos Ambientalmente Amigáveis como Inibidores de Corrosão em Ambientes Contendo CO2
… the effects of shear stress, test duration, pH value and the iron carbonate film previously formed on the metal surface were also evaluated. The results indicated which blends are stable and capable to provide corrosion protection in the 72 hours tested, as well as the component that most …
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Characterization of nanostructures ZnO synthesized through hydrothermal method
… are types of alkaline solution, the alkaline pH value used and the application hours of the hydrothermal process. This research focuses on the fabricated ZnO nanostructures via hydrothermal synthesis and the effects of alkaline solution on the morphology of ZnO nanostructures. Distilled water …
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Physicochemical properties of soy- and pea-based imitation sausage patties
… mushrooms (KOM) (0%, 3.5% and 7%) affect the physicochemical properties of imitation sausage patties using textured soy or pea proteins as the main base ingredient. After all materials were blended evenly and formed into circular patties, the raw patties were then fried on the pan with corn …
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Compact Optical Sensing Systems for pH and Other Substances Detection - Theory and Implementation
… ways. In the first project real-time optical pH sensor based on complementary metal–oxide–semiconductor (CMOS) contact imaging and microfluidics, an optical contact imaging sensor for pH detection with capillary microfluidics is proposed. The CMOS array detects the changes of light intensity …
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Characterization of sludges produced when using polyaluminum chloride coagulants
… (r*), capillary suction time (CST), and sludge pH. The effects of chemical conditioning (lime and cationic polymer) and mixing intensity (Gt) upon the sludge dewatering characteristics in a pilot-scale plate and frame press were also studied. The dewatering characteristics of the Hyper⁺Ion …
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Visualization of water/oil displacement in porous media in the presence of chemical reaction.
… tension, optimum wettability condition, high pH value, and the electric charge density at the interface can improve the oil recovery percentage appreciably. However, the addition of sodium hydroxide changes the interfacial tension to an ultra-low value. Interfacial tension decreases as a …
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Smart Hydrogels based on Responsive Star-Block Copolymers
… external stimuli, specifically temperature and pH. Our concept was based on (AB)x diblock copolymer stars where both blocks are responsive to temperature and pH. This approach led to physically crosslinked hydrogels, which could form/disintegrate in response to a first trigger, i.e. the outer B …
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CHITOSAN PARTICLES FOR THE CONTROLLED RELEASE OF PROTEINS
… microparticles found a lot of applications in pharmaceutics such as vaccine delivery, mucosal delivery and gene delivery, etc. Down to the nanoscale, chitosan nanoparticles have more attractive properties more than that of chitosan microparticles, which further widen the applications of …
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Untersuchung der Kalzifikation von Perikard und Polyurethan in Abhängigkeit des pH-Wertes
… part of the study is aimed to investigate the pH-dependency as one of the main physico-chemical factor of Calcification. Incubation of PUR and bovine pericardium using buffered physiological fluid to precipitate is carried out. With 0.024 M HEPES-and TRIS buffer solution bovine plasma was …
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Experimental investigation of integrated systems for biohydrogen and biomethane production
… V, outperforming other electrodes. The optimum pH value and temperature for bioH2 production in the MEC systems are 6 and 40°C, respectively. The bioH2 production is enhanced by CO2 and N2 sparging, resulting in a 40% and 35% increase, respectively, under improved conditions. The highest H2 …
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Effect of processing and storage conditions upon canned apple sauce headspace gas composition
… sauce and storage time and temperature, food pH and consistency, and headspace vacuum and volume were studied. The apple sauce processing method used essentially duplicated commercial procedures. Canned apple sauce was stored at l00°F for 7 or 10 months, and sampled for headspace gases with a …
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Synthesis, characterization and catalytic testing of metal tungstates as catalysts for activation of lower alkanes
… and structural properties of vanadium-containing phases govern the formation of isolated active sites at the surface of these catalysts for selective alkane oxidation. This concept is not restricted to vanadium oxide. The deliberate use of hydrothermal techniques can turn the typical combustion …
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Development and application of a microfluidic single-cell cultivation device to simulate dynamic environmental conditions for Corynebacterium glutamicum
… dissolved oxygen, substrate concentration, and pH value, which are negligible at the laboratory scale. The gradients resulting from the fluctuating environmental conditions are generated by insufficient mixing of the volume. This can not only affect individual cells as they travel through the …
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Studies of gastric aspirate nitrite, pH, bacterial flora and mutagenicity in man
… patients. The nitrite concentration and pH values of the aspirates were measured, the microorganisms present in selected specimens were isolated and identified, and the mutagenicity ratios of the aspirates were determined. The median nitrite concentration of the gastric aspirates from the …
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Development of a method for quantitative imaging of air-water gas exchange
Using a fluorescent pH indicator (pyranine), a new measurement method to investigate the exchange of a soluble alkaline gas (ammonia) from air to water was developed. Key feature of the method is that a linear relationship between the concentrations of the dissolved gas and the alkaline form of the …
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Synthesis and use of new Porphyrin Derivatives
The Ph.D work was aimed to design, synthesize, and test capabilities of new spermine-porphyrin and BODIPY derivatives, and to study their interactions with various biological targets. The research period was focused on the synthesis of porphyrin derivatives with a different number of spermine …
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