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.
Results
Showing 1 to 20 of 70 for “"Mixing Time"”.
-
Experimental investigation of mixing time in a stirred, torispherical-bottomed tank equipped with a retreat-blade impeller
… tank a single baffle mounted from the top. The mixing performance of such reactors has not received significant attention in the literature, despite their ubiquitous presence in the pharmaceutical industry. In particular, mixing time, i.e., the time required by the system to achieve a predefined …
-
Minimum agitation speed for solid suspension and mixing time in a torispherical -bottomed pharmaceutical stirred tank under different baffling conditions
… in this work for a glass-lined type of mixing tank provided with a torispherical bottom and agitated with a retreat-blade impeller under different baffling configurations. Ns for the same tank but equipped with a different agitation system, namely an axial impeller, was also …
-
Power dissipation and mixing time in a partially filled pharmaceutical reactor equipped with a retreat-blade impeller at different fill ratios
… industry, some of the most important mixing characteristics of this type of reactor have not been fully studied, such as the power dissipated by the impeller under different baffling conditions and blend time, i.e., the time required by a system to achieve a predetermined level of …
-
In situ observation of the distribution and location of gliadin as a function of mixing time in wheat flour dough using quantum dots
… and location of gliadins as a function of mixing time in model wheat flour dough were investigated for the first time using confocal laser scanning microscopy. In this research we tagged gliadin proteins with Quantum Dots (QDs) to increase the clarity and specificity of imaging and then …
-
INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… and subjected to high temperature and prolonged mixing time. The thesis also aimed at formulating recommendations for the effective use of chemical admixtures in high temperature environments. In order to achieve these objectives, the rheological properties of portland cement pastes incorporating …
-
INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… and subjected to high temperature and prolonged mixing time. The thesis also aimed at formulating recommendations for the effective use of chemical admixtures in high temperature environments. In order to achieve these objectives, the rheological properties of portland cement pastes incorporating …
-
Microbial flocculation for large scale harvesting of marine microalgae for the production of biodiesel.
… (acetic acid, glucose or glycerine) and a 24 h mixing time, a recovery efficiency (RE) of over 90% and a concentration factor (CF) of 226 was achieved. Statistical analysis showed that both RE and CF were independent of the substrates used and that RE was positively correlated with mixing time, …
-
Characterization of mixing in a coaxial jet mixer for nanoparticle fabrication
Mixing in a micro-scale coaxial turbulent jet mixer for the fabrication of nanoparticles for drug delivery was experimentally characterized. Rapid mixing due to turbulence offers improved control of nanoparticle production over conventional bulk nanoprecipitation methods. Mixing time was determined …
-
Processing and microstructure of standard and modified macro-defect-free cements
… were prepared through an alternative, Banbury mixing route. Experiments with varying mixing time at constant mixing rate showed that an intimate distribution of constituents in the composite was assured at the early stages in the shear mixing step. With increasing mixing time, mechanically …
-
Exponential Random Graphs and a Generalization of Parking Functions
… <p>For finite systems, we analyze the mixing time of exponential random graph models. The mixing time of unweighted exponential random graphs was studied by Bhamidi, Bresler, and Sly. We extend upon the work of Levin, Luczak, and Peres by studying the Glauber dynamics of a certain …
-
Integral geometry, Hamiltonian dynamics, and Markov Chain Monte Carlo
… demanding situations, since their mixing times need not grow exponentially with the dimension of [pi]. However, if [pi] has many modes, MCMC algorithms may still have very long mixing times. It is therefore crucial to understand and reduce MCMC mixing times, and there is currently a …
-
Application of restaurant waste lipids (RWL) as a binder component in metal injection moulding
… of RWL as binder component was monitored base on mixing condition, rheological characteristic, injection moulding, debinding and sintering process. Mixing time of 90 minutes was obtained as suitable mixing time for producing good homogenise feedstock base on mixing the polypropylene (PP) and RWL. …
-
Kac's random walk and coupon collector's process on posets
… we study a long standing open problem on the mixing time of Kac's random walk on SO(n, R) by random rotations. We obtain an upper bound mix = O (n2.5 log n) for the weak convergence which is close to the trivial lower bound [Omega] (n2). This improves the upper bound O (n4 log n) by Diaconis …
-
The relationship of chlorination and protein and lipid content to baking quality of soft wheat flour
… treatments involving rate and application time to alter protein content. One-half of all flour treatments were subjected to chlorination. The lipid and protein content, gliadin and glutenin composition, microstructure, rheological properties, ash, pH and color were examined. Baked angel …
-
Production of Selenium-enriched Wheat Protein Concentrates and Isolates for Enhancement of Wheat Flour Functionality
… of wheat protein isolates decreased peak dough mixing time while vital gluten, in general, contributed to increased dough mixing time requirement. However, there was no significant difference in peak mixing time for the blends. Dough stability was significantly higher in vital gluten blends …
-
Evaluation of the degree of blending of Reclaimed Asphalt Pavement (RAP) binder for warm mix asphalt
… well as other varying pre-paving conditions like mixing time, mixing temperatures, conditioning time, and WMA type. A comparison between fine and coarse extracted samples immediately showed that the binder from virgin and RAP aggregate is not similar and is not fully blended. Degree of blending …
-
Single and multiphase mixing in partially filled stirred vessels
In many industrial applications, mixing vessels have a liquid height-to-tank diameter ratio, H/T, equal to, or larger than 1. However, there are many instances where this ratio is lower than 1, as in all those cases in which the vessel is either emptied or filled. Even when H/T<1, sufficient …
-
Fast spectral primitives for directed graphs
… following: -- We give the first nearly linear time algorithms for a large class of directed graph problems including computing the stationary distribution of a Markov chain with only a logarithmic dependence on the mixing time. Our approach is based on developing new spectral tools for directed …
-
Municipal sludge dewatering using a belt filter press
… filter press performance. In addition the total mixing energy, G (the shear) and t (the mixing time), that represents the laboratory belt filter press was found to be approximately 45,000. Using a mixing energy input of 45,000 and a standard Buchner funnel apparatus the correct polymer dose for …
-
Universality of Cutoff for Random Walks on Random Cayley Graphs
… cutoff with high probability (whp); • the cutoff time depends only on k and |G| asymptotically (up to smaller order terms). The cutoff time should not depend (strongly) on the choice of generators. In other words, "cutoff is universal for the random walk on the random Cayley graph". Restricted to …
Page 1 of 4