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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 28 for “"Ashing"”.
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Design of experiments on a semiconductor plasma ashing process : methods and analysis
… in a semiconductor fabrication process (plasma ashing). New approaches are introduced to Analog Devices Inc. in calculating wafer statistics. Methodologies are developed that will help the company to choose the right experimental designs based on the objective (e.g. accurate prediction of the …
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Post oxide etching cleaning process using integrated ashing and HF vapor process
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Study and analysis of surface charge collection and emission spectrum of plasma ashing process
… Probe for changes in parameters during plasma ashing. In this report, it is covered on the plasma characteristics and performance using the optical emission spectroscopy (OES) measurement, the study on how processing condition change can impact the total surface charge collection and also the …
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Pulse microwave mediated sample clean-up method to analyse trace metals, PCBs and pesticides, and for treatment of organic wastes
… is described for open vessel pulse microwave wet ashing system. In wet ashing procedure organic matrix in biological tissues is digested in acid. This step must precede trace metal analysis by atomic absorption spectroscopy. Conventional wet ashing procedure using hot plate takes several hours. …
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Control of a semiconductor dry etch process using variation and correlation analyses
… SPC to a dry etch process (in this case plasma ashing), at Analog Devices, Inc., a company that runs large-scale fabrication sites in the Boston area. This thesis focuses on spatial and run-to-run variation across multiple measurement sites on a wafer and validates the assumptions of normality …
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REACTIVE GASES IN ELECTROTHERMAL ATOMISATION ATOMIC ABSORPTION SPECTROMETRY
… by converting the normal charring into an ashing step. A number of interferences eg. magnesium chloride on lead determinations and non-specific absorbance interferences, decreased when air was introduced. Hydrocarbon gases (< 5% v/v) introduced during charring improved sensitivity (up to …
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Gradient ion chromatographic determination of rare earth elements in coal and fly ash
… pressure vessels in a microwave oven. Standard ashing procedures, followed by acid dissolution, were carried out to allow comparison with the microwave digestion technique. A lithium metaborate/tetraborate fusion and acid dissolution technique was used for the dissolution of fly ash. For the …
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Utilization of crab processing waste and chitin associated with the waste as feed for ruminants
… Similar values were obtained for chitin when ADF/ashing method was compared to the ADF/deacetylation method. These methods prevented loss of chitin during preparation. Digestibility of chitin was higher (58%) for sheep fed 100% crab waste-straw silage compared to the value of 37% in sheep fed 50% …
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Kukorica (Zea mays L.) hibridek biogén szilícium tartalma és a termésbiztonság növelésében betöltött szerepének alapjai
… négy ismétlésben, ún. „dry ashing” módszerrel. Vizsgáltuk továbbá a buroklevelek Cr, Mn, Fe, Al, Cu, Ni, Zn tartalmát ICP-MS technikával, kontroll és műtrágyázott beállításokban, összefüggést keresve a Si tartalom és az említett elemek mennyisége között. Vizsgálataink …
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Selected minerals in raw and cooked chicken parts
… and drippings. A nitric and perchloric acid wet-ashing digestion eliminated all organic matter from ten gram samples leaving behind the elements which were detected spectrophotometrically. Values were expressed in mg/100g wet sample. The most abundant minerals studied were phosphorus and …
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Studies of clay minerals and their decomposition products
… .the dehydroxylation of the clay minerals during ashing at 700 to 750 C. By using a combination of several physicochemical methods, different successive stages of dehydroxylation, structural consolidation, and recrystallisation of illite, montmorillonite and hectorite upon thermal treatment to …
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The determination of trace metals in mixed matrices
… and compared statistically with a standard dry ashing/fusion procedure and with a wet oxidation method employing a high pressure asher. Results showed there to be no significant differences between the direct slurry method and the comparison procedures.
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Characteristics of the Recovery of the Coenzyme A-Synthesizing Protein Complex from Saccharomyces Cerevisiae
… trypsin and protease; (4) it is inactivated by ashing; and (5) has no ultraviolet absorption at 260 mu and 280 my. </p> <p>Replacement of t-Factor by commercially available compounds or solubilizing agents has failed to reveal its identity. A "one-step" purification of CoA-SPC may be obtained by …
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What are southern Cape renosterveld geophytes storing in their underground organs?
… (mass spectrometry), phosphorus percentage (dry-ashing extraction method) and starch content (Megazyme Total Starch Assay Kit, which follows an enzymatic procedure). Bulbs (mean = 30.89mm) and tubers (18.65mm) were found to have significantly larger widths than corms (11.13mm) and secondary …
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Chamber matching in semiconductor manufacturing using statistical analysis and run-to-run control
… and applied to chambers that run the plasma-ashing process. Using design of experiments, the machines are modeled individually and globally. While individual models reveal the mismatch, a global model is proposed as a step to optimize the process recipes for matching. The root cause of the …
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… added barytes estimated gravimetrically after ashing. Shock cooling of the extruder and sectioning of the solidified compound in the screw channels was used to-study the flow mechanism. The maximum throughput achieved, polymer melting mechanism, filled volume and axial mixing Are interrelated, …
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Quantification of biomass in a biooxidation system
… determination of chemical oxygen demand, ashing, protein analysis, nitrogen analysis, total organic carbon analysis and measurement of oxygen utilisation rate. The oxygen utilisation rate method differs from the other methods as it uses the metabolic activity of the bacteria to measure the …
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Quantification of biomass in a biooxidation system
… determination of chemical oxygen demand, ashing, protein analysis, nitrogen analysis, total organic carbon analysis and measurement of oxygen utilisation rate. The oxygen utilisation rate method differs from the other methods as it uses the metabolic activity of the bacteria to measure the …
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Mercury methylation potentials in sediments an ancient cypress wetland using species-specific isotope dilution-GC-ICP-MS: Analytical method development and the effect of sorbent amendments
… mass spectrometry (ICP-MS) with online sample ashing. The method combines a direct mercury analyzer (DMA) that is based on sample combustion, Hg pre-concentration by amalgamation with gold, and atomic absorption spectrometry (AAS), with a high resolution ICP-MS. Unlike AAS, the ICP-MS is …
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The effect of a magnesia based additive on fly ash depostition in a chain-grate boiler system.
… ash components separated by high temperature ashing of coarse particles of coal as well as the bulk ash from the coarse and fine sizes of coal particles. The softening behaviour on heating and crystallisation tendency behaviour on cooling for a selected range of the ash components was …
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