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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 185 for “"contact time"”.
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A Study of the Resin Contact Time Method for the Determination of Bound Calcium
Made available in DSpace on 2014-12-10T22:38:15Z (GMT). No. of bitstreams: 1 7114807.pdf: 5089273 bytes, checksum: f706c300242d680d760f1eacde141ba6 (MD5) Previous issue date: 1970
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Effect of organic matter and contact time on the sorption and bioavailability of chlorophenols
… a large percentage of unextractable compounds. Contact time was found to have the greatest effect on the amount of this nondesorbable fraction. The ultrafiltration study suggested that DOM polymerized into larger molecules after sufficient mixing time (3 months) in solution, which also increased …
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Evaluation of an Electro-Disinfection Technology as an Alternative to Chlorination of Municipal Wastewater Effluents
… of 98.7 % or higher was achieved within a contact time of less than 15 min and a current density lower than 7.5 mA/cm2 when stainless steel electrodes were used, and a contact time of less than 5 min and a current density lower than 3.5 mA/cm2 when the stainless steel/titanium cell was …
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Squeeze-film flows, with application to the human knee joint
… case of an impermeable bed, in which an infinite time is required for the two surfaces to come into contact, for a porous bed contact occurs in a finite time. Lubrication approximations are used and numerical and (where possible) analytical solutions for the fluid layer thickness, the fluid …
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Oxidation of Microplastics: Evidenced by Spectroscopy, Hydrophilicity, and Heavy Metal Uptake
… using various temperatures, pH values and contact time. Irradiation studies were done at varying contact times. Weathered microplastics, as opposed to pristine, more accurately indicate how microplastics can serve as vectors for other pollutants in the environment. Evidence of weathering is …
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A Biomechanical Analysis of Sprinters vs. Distance Runners at Equal and Maximal Speeds
… overlap. With distance events, there comes a time near the end of the race where economy gives way to speed. If the distance runners knew how to alter their technique in a way to become more sprint-like, this process could possibly be more successful. <strong>PURPOSE:</strong> This study …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΟΥ ΕΞΕΥΓΕΝΙΣΜΟΥ ΥΨΗΛΟΒΑΘΜΩΝ ΠΥΡΗΝΕΛΑΙΩΝ
… OF PHOSPHATIDES AT 80 C, WITH 2-5% H2O AND CONTACT TIME 10 MIN RESULTS TO - 35-40% REMOVING OF PHOSPHOROUS CONTENT IN CRUDE OIL. THE DEGUMMING RESULT IS IMPROVED BY INCREASING THE CONTACT TIME, BUT IT'S NOT RECOMMENDED BECAUSE OF THE INCREASE OF THE DEGUMMED OIL ACIDITY. THE ALKALI REFINING …
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Optimization of the automated spray layer-by-layer technique for thin film deposition
… solution concentration, polyelectrolyte spray time, spraying distance, air pressure and polyelectrolyte charge density. These parameters are independent of the type of species used to construct the film, and thus the trends should apply to any species used to construct thin films. The effect of …
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Tibial Acceleration and Shock Attenuation in Female and Male Distance Runners at Different Levels of Body Weight Unloading
… peak TA and shock attenuation, bone stimulus, or contact time, regardless of running speed. However, a significant relationship was observed between running speed and both mean peak TA and bone stimulus where an increase in speed led to an increase in TA and bone stimulus. Furthermore, running …
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Efficacy of Selected Chemicals on the Attachment and Survival of Campylobacter jejuni on Chicken Breast Skin
… breast skin. All chemicals were evaluated using contact times of 30 sec., 3 min. or 10 min. Statistically significant (p £ 0.05) differences in the reduction of C. jejuni populations were observed across chemical treatments and contact time. When bacteria were applied before treatment, a …
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The Impact of Lower Limb Dominance on Side-to-Side Symmetry in Daily Living and Sports-related Tasks
… collect plantar loading data such as peak force, contact area, and contact time, from 10 athletes. Participants completed five t-drill trials and five agility ladder drill trials. The acceleration phase of the t-drill served as standard running. A mixed effects model was used to test if …
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Vapour phase catalytic oxidation of 2-methylpropene over bismuth molybdate catalysts.
… and carbon dioxide increased rapidly at longer contact time, it was hardly affected in the range of shorter contact time. Out of the several models proposed for the oxidation of 2-methylpropene over bismuth molybdate catalyst. The most suitable one appear to be the one in which the rate …
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Investigating the Effects of Shoe Upper Panel Stiffness on Biomechanics
… Stiffening the upper panel significantly altered contact time during the lateral skater jump with the stiffest shoe having the shortest contact time compared to the other two shoe stiffness conditions (p=0.020-0.046). Shoe upper panel stiffness significantly changed peak concentric power in the …
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An Evaluation of the Loss of Copper, Chromium, and Arsenic Preservatives From Pressure-Treated Lumber
… while acidity of the leachate, ion exchange, and contact time may offer minor increases in CCA loss.
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Land Use Impacts of Plastic Mulch Tomato Production and Evaluation of Sorbent Control on Shellfish Hatchery Operations
… nearby streams and estuaries. During the same time period, there was also an increase in the use of plastic mulch on some of the vegetable fields on the Eastern Shore. The increased runoff commonly associated with these plastic-covered fields often contains copper-based bactericides that are …
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A Comparative Analysis of Two Low-Acuity Flow Processes in the Emergency Department
… were calculated using "arrival to first provider contact time" and "arrival to departure time" as the dependent variables and RMA process versus FT process as well as ESI levels as the independent variables. There was a significant difference in the mean arrival to first provider contact times for …
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Efficacy and impact of sanitizers in controlling pathogenic bacteria on irrigation water
… under varying turbidities (0, 50, 100, 150 NTU), contact times (CT: 3 or 5 minutes), and bacterial concentrations of EHEC, SM, or LM at 6 and 3 log CFU/mL per EPA 2020 guidelines. Treatments that achieved a 3-log reduction of the selected organisms within a 5-minute contact time, with no viable …
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The oxidation of ethylene to ethylene oxide
… ethylene feed concentration, temperature, and contact time on the products of oxidation of ethylene to ethylene oxide; and together with subsequent hydrolysis to evaluate the commercial feasibility of the manufacture of ethylene glycol. The review of the literature contained 10 references. The …
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Optimization of biosorption process using cucumis melo rind for the removal of Fe, Mn and Pb ions from groundwater
… dosage, initial metal concentration and contact time. Characterization of biosorbent was done by the means of SEM-EDX, XRF and FTIR analysis to observe for the surface morphology, elemental composition and functional groups available on the biosorbent. Sorption was most efficient at pH 7 …
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Regrowth of E. coli and S. faecalis in treated sewage after chlorination in a continuous-flow reactor
… Regrowth was evaluated at varying chlorine contact times and chlorine residuals. In addition, chemical and physical characteristics of the sewage were evaluated in relation to regrowth. The results showed that while a 99% kill of E. coli could be achieved, regrowth always occurred regardless …
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