نتایج جستجو برای: mechanical stirring
تعداد نتایج: 239876 فیلتر نتایج به سال:
Dry anaerobic digestion (DAD) is an attractive method for simultaneous organic waste disposal and bioenergy recovery. DAD has the problems of low methane yields, reaction rates, easy inhibition due to its limited mass transfer heat transfer. In this work, two methods mechanical stirring percolate recirculation were compared regarding their capacities improving enhancing performances in batch ex...
Reviewed were the problems and methods for control of chaos, which in the last decade was the subject of intensive studies. Consideration was given to their application in various scientific fields such as mechanics (control of pendulums, beams, plates, friction), physics (control of turbulence, lasers, chaos in plasma, and propagation of the dipole domains), chemistry, biology, ecology, econom...
We study the evolution of a localized perturbation in a chemical system with multiple homogeneous steady states, in the presence of stirring by a fluid flow. Two distinct regimes are found as the rate of stirring is varied relative to the rate of the chemical reaction. When the stirring is fast localized perturbations decay towards a spatially homogeneous state. When the stirring is slow (or fa...
The experiment of the rheocasting-rolling for semi-solid magnesium was carried out on the equipment made by ourselves in our laboratory. Semi-solid AZ91D magnesium slurry was prepared by cooling slope and mchanical sirring The evolution of microstructure under different technological parameters were studied. The results show that the technological parameters have great influence on the microstr...
To investigate quantitatively the effects of stirring on protein crystallization, a new stirring system which can agitate a protein solution, approximately 100 nl, by providing Hagen-Poiseuille flow has been successfully developed. In addition, this new stirring system provides flow with a well defined pattern and velocity. Using this system, hen egg-white lysozyme was crystallized in 100-200 n...
The hydrophilic flocculation of pyrite fines in aqueous suspensions with corn starch was studied by measuring particle size distribution, microscopy observation and micro-flotation. Furthermore, the interaction of corn starch with pyrite was investigated by determining the adsorption density and based on zeta potential measurements and X-ray photoelectron spectrometer (XPS) analysis in this wor...
Objective: Studying new carrier materials to solve the problems of bioavailability and side effects drugs in body choose suitable coat drug. This not only improves release absorption drug molecules body, but also significantly reduces toxic high concentrated drugs. Therefore, this paper focuses on research synthesis a material. Methods: Using ferric nitrate as iron source, first add nitrate, 1,...
Nowadays one can observe the explosion in recovery of new polysaccharidic materials with specific controllable properties, including mechanical characteristic, morphology, biological activity and biodegradability. Specifically, formation and application of hydrogel microcapsules by biomedical and pharmaceutical industry seem to be very promising (Wang, et al., 2006). Despite many successful app...
Constructive effects of noise in spatially extended systems have been well studied in static reaction-diffusion media. We study a noisy two-dimensional Fitz Hugh-Nagumo excitable model under the stirring of a chaotic flow. We find a regime where a noisy excitation can induce a coherent global excitation of the medium and a noise-sustained oscillation. Outside this regime, noisy excitation is ei...
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