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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 18 of 18 for “"Total acid"”.
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Anthropogenic Lead Deposition and Four National Parks in Poland as Determined by Lead Isotope Ratios
… underwent sequential chemical extractions and total acid extractions, while soils from Biesczcady National Park, Roztocze National Park, and Poleski National Park underwent total acid extractions.</p>
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From field to feed: The effects of fungicidie application and cutting height on the quality and in situ degradability of corn ensilied as whole plant corn silage
… prevalence was recorded as percent of the total individual plant infected. Fungicide application had no effect (P = 0.5922) on disease prevalence (1.62%, 1.07%, 1.23%, 1.48%; SEM = 0.30 for CON, V5, V5R1, and R1, respectively). On August 30, 2017, WPCS was harvested at 34.0±1.6% dry matter …
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Reactor Design for Partial Upgrading of Bitumen via Aquaprocessing
… /bbl. because of its high viscosity, density, total acid number, and sulfur content and lack of access to market outside North America. Under these circumstances, partial upgrading processes such as Aquaprocessing are envisioned as a potential solution. The synthetic crude oil produced from …
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Development of a fine coal beneficiation circuit for the Twistdraai Colliery
… of the coals hydroxyl, carboxylic and total acid groups, since these exert the most important influence on the properties of the coal surface. These are supported by contact angle measurements, petrographic analysis and washability measurements in orde:r to determine the oil wettability …
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CO2 sequestration using brine impacted fly fish
… mass spectrometry and ion chromatography. Total acid digestion was carried out to evaluate the differences in the total elemental content in both the fresh ash and the carbonated solid residues. The results suggested that South African FA from Secunda belongs to class F based on the CaO …
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Structures of the Didemnins (Antiviral, Antitumor, Compounds)
… isolated from a Caribbean tunicate. Their amino acid compositions were ascertained by gas chromatography/mass spectrometry of the trifluoroacetyl n-butyl ester derivatives of the amino acids present in the total acid hydrolyzates. The identities of non-amino acyl components were revealed by ('1)H …
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Hydrocracking of long chain n-Paraffins under Fischer-Tropsch conditions
… the metal de-/hydrogenation (HD/DHD) and the acidic -scission function. The addition of CO to reactions involving monometallic palladium hydrocracking catalysts has led to an imbalance between these functions due to the migration of the noble metal resulting in significant and undesirable …
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Characteristic Analysis of Acid Mine Drainage Precipitates for the Optimization of Rare Earth Extraction Processes
Acid mine drainage (AMD) forms when sulfur bearing rocks such as pyrite, are exposed to air and water. The oxidation of these minerals leads to the generation of sulfuric acid, which in turn mobilizes metals such as iron, aluminum, manganese, and others. If left untreated, AMD can cause severe harm …
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Isolation and lactose metabolism of Streptococcus lactis variety tardus from southwestern Virginia
… composed 61.5, 90.0 and 95.2 per cent of the total lactic streptococci population. Identification of the S. lactis var. tardus cultures was accomplished by silicic acid column chromatography of the spent lactose-phosphate-yeast extract media. Two cultures of S. lactis var. tardus were isolated …
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Kinetic Study of the Catalytic Desorption of Carbon Dioxide (CO2) from CO2-Loaded Monoethanolamine (MEA) and Blended Monoethanolamine-Methyldiethanolamine (MEA-MDEA) during Post Combustion CO2 Capture from Industrial Flue Gases
… an internal diameter of 2-inches (0.051 m) and a total height of 3.5 ft (1.067 m). The experimental kinetic data for CO2 desorption were obtained in the catalytic packed bed tubular desorber at three temperatures (348, 358, and 358 K), using MEA and MEA-MDEA concentrations respectively of 5M and …
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Multiphase Flow Effects on Naphthenic Acid Corrosion of Carbon Steel
… of corrosive sulfur compounds and naphthenic acids (NAP) which, at high velocity multiphase flow conditions, can impair the integrity of transfer lines in crude distillation units. Previous studies have shown that NAP corrosion is particularly aggressive in the presence of a liquid phase at …
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An investigation into the tropospheric chemistry of acidic aerosols and ammonia in the laboratory
… between various ratios of ammonia gas and acidic aerosols were studied in aerosol form as opposed to bulk solutions. The apparatus is unique, in that it employed two aerosol generation methods to follow the size evolution of the aerosol while allowing detailed spectroscopic investigation of …
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Partial Upgrading of Lignocellulosic Bio-Oil via Deep Catalytic Hydrotreating
… bioenergy accounts for one-tenth of the world's total primary energy supply and biofuel production is forecasted to increase 25% by 2024. The bio-oil is composed of a complex mixture of oxygenated compounds with a relatively high concentration of water. Compared to crude oil, bio-oil has high …
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The recovery of acetic acid from wastes of tanning extract manufacture
… The liquors are highly corrosive due to acetic acid contained therein along with lesser quantities of other organic substances common to woody materials. Recovery of the acetic acid would be desirable from two standpoints: (1) the value of the acetic acid, and (2) reuse of the acid-free …
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Quantification of sugars and organic acids in 210 cucumber (cucurbis sativus) varieties for genome-wide association studies (GWAS)
There is limited information on the sugar and acid contents in Genome-Wide Association Study (GWAS) cucumbers. This study aimed to measure total soluble solid content (ºBrix), three main sugars via high-performance liquid chromatography (HPLC), pH, titratable acidity (TA), and three main organic …
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Trace metals and nutrients in aerosols over the tropical and subtropical North Atlantic Ocean
… tropical North Atlantic Ocean in January 2008. Total acid digestion followed by ICP-MS analysis reveals that the total elemental composition of the dust is close to average crustal composition and shows a high degree of consistency. Based on elemental composition data alone, dust collected on …
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Gene Activation in Early Amphibian Development
… The time course of incorporation of uridine into total acid insoluble RNA shows a marked increase between the blastula and early gastrula stages. Autoradiographic studies demonstrated a sudden activation of nuclear RNA synthesis by the late blastula stage from an initially negligible level in the …
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Development of zeolite based acid catalysts for the synthesis of methyl tertiary butyl ether
… industrially from methanol and isobutene over an acidic ion-exchange resin Amberlyst-15. This commercial catalyst, although very active, still suffers from several drawbacks such as thermal instability, acid leaching, and need of a high methanol over isobutene ratio. Zeolites for their higher …