The goal of the present study, characterizing the effect of phase proportions on polyphase aggregate strength, was to some extent motivated by prior work (Hitchings et al., 1989) that suggested weaker behavior for mixed-phase aggregates than for single-phase aggregates with end-member compositions of enstatite and olivine. A meaningful ...
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These suspensions were passed through a high-pressure dispersion apparatus described in detail elsewhere [14]. A pressure drop ranging from 200 to 1400 bar was applied by the high-pressure intensifier using pressurized air. The TiO 2 suspension was expanded through a 1 cm long nozzle of 125 μm diameter and collected for analysis …
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High hydrostatic pressure treatment. High hydrostatic pressure treatment was applied using the S-IL-070-550-09W system (Stansted Fluid Power Ltd., Harlow, Essex, UK). SPP dispersions at 4% were vacuum-sealed in two layers of polyethylene bags. Pressure was applied at 400 or 600 MPa for different holding times (0.5, 2, 8, and 16 h) at 20 °C.
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Loading conditions were determined by studying impact experiments of a 1.2 kg-projectile on a high explosive contained in a metallic shell [4], [5], [6].Different shells were used ensuring front and back confinements of the target (Fig. 1).The front plate was thin (less than 5 mm) whereas a thicker back plate was used to limit back face …
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Examples include highpressure homogenization (throttling a liquid suspension through a fine capillary nozzle) or high-speed/high-shear stirring. Using a motionless high-pressure homogenizer for individual suspensions of zirconia (12 nm), silica (7, 12, 20, and 30 nm), and titania (21 nm) in an ethylene glycol aqueous solution.
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Hence, achieving acceptable yield (e.g., .10%) of refolded protein often requires protein to be refolded at very low concentrations (10–100. mg yml) (16, 17, 19). As a result, once a therapeutic protein is refolded, it must be concentrated (typically 100- to 1,000-fold) to final dosage concentration. Losses of native protein also can occur ...
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Resilient modulus (Mr) and permanent deformation (PD) characteristics of unbound aggregates under repetitive traffic loads dictate the structural response and performance of pavement base and subbase layers.Aggregate material behavior is dependent on the amount of fines in particulate matrix, also referred to as fines content …
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Abstract. Accelerated carbonation is recognized as a possible way to improve the quality of recycled concrete aggregates (RCA) and thus increase the possibilities of their use for concrete manufacturing. This work is a contribution to exploring high-pressure carbonation as a possible technology for carbonation of cement-based RCA.
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In the process of blasting construction, a large amount of dust generated from a driving face rapidly covers an entire work zone under the action of detonation gas at high temperatures and high pressures.
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The particle sizes of fine aggregates (sand, laterite, and quarry dust) ranged from 0.06 to 4.75 mm, while coarse aggregate (crushed granite) ranged from 5 to 20 mm in sizes.
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A high pressure wet-type jet mill was employed to disperse nano-particle suspensions. Commercially available nano-particles, fumed silica (SiO 2) of primary particle diameter (d 0) ranging from 7 to 40 nm, alumina (Al 2 O 3) of d 0 = 12 nm and titanium oxide (TiO 2) of d 0 = 21 nm were dispersed in the continuous phase up to viscosity η c …
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The average dust suppression efficiencies for Total Suspended Particles (TSP), PM10, and PM2.5 for the mist generators are 80.9%, 77.9%, and 76.9%, respectively, whereas …
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gold layer. For a given ambient pressure and given laser inten-sity (controlled with the driver current) the temperature of the dust aggregates was measured with an infrared camera as seen in Fig.3. Calibration curves were recorded to calculate the tempera-ture of aggregates for a given pressure and intensity combination as seen in Fig.4.
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Fig. 10 (c) shows the pressure profiles of venting with high dust concentration and big venting area. The pressure change from rising to falling is still completed in a transient time. However, the maximum reduced pressure is greater than the activation pressure compared with pressure in Fig. 10 (b). Because of the rapid …
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This implies that the absolute dust load is not the only factor important for the suspension, but also the availability of the dust load for suspension. Even though the …
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To add water (hydrogen), high-pressure annealing experiments were performed at the pressure of 4.0 GPa and temperature of 1373 K, where the annealing time is 3 hr and the oxygen partial …
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By comparative analysis, dust-proof effects of seam, dynamic pressure water infusion and high-pressure spray in the tunneling face at the Daning coal mine using pure water, wetting agent SRJ-1and ...
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Rasoul H. Moghadam, Claudia A. Trepmann, Bernhard Stöckhert, Jörg Renner, Rheology of Synthetic Omphacite Aggregates at High Pressure and High Temperature, Journal of Petrology, Volume 51, Issue 4, April 2010, ... the thin sections were chemically polished using a colloidal silica suspension (15–20 min). For a number of …
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The most effective sprays come from low-velocity systems, as high-velocity air movement can keep dust particles in suspension. The techniques to improve plain …
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Under some conditions, the abnormal hemoglobin molecules can aggregate to form long, rigid fibers that cause the red blood cells to deform, adopting a characteristic sickle shape that prevents them from passing through the capillaries ( Figure 13.6.2 ). The reduction in blood flow results in severe cramps, swollen joints, and liver damage.
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Baier and Knorr (2015) observed minor and sometimes reversible modifications in patatin structure and ing property following different pressure-temperature combinations (200–600 MPa and 20–40 °C), concluding that patatin is rather pressure-stable and requires high pressure levels to be altered.
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Request PDF | On Feb 24, 2015, Anthony Rondeau and others published First experimental results of particle re-suspension in a low pressure wind tunnel applied to the issue of dust in fusion ...
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Sometimes classified as Washing Equipment, wet dust suppression systems are typically integrated on standalone conveyors or newer machinery that involves conveyor belts and screens, (like crushers that include built-in belts and/or screening capabilities). This equipment tends to generate the most dust in a variety of aggregate production and ...
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NESCO "Dr. Dust" High Pressure Spray Systems use state-of-the-art technology to control dust year round in aggregate plants without blinding screens or throwing products out of spec. High pressure sprays use a powerful mist to suppress dust and conserve water. Remote electronic control allows operators to switch on spray nozzles when and where ...
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The sand equivalent test (Figure 1) is a rapid field test to show the relative proportions of fine dust or clay-like materials in fine aggregate (or granular soils). The term "sand equivalent" expresses the concept that most fine …
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High-pressure homogenization was recently studied for recovering rice starch and protein fractions (Guraya and James, 2002). The flour particle size was reduced to less than 10-µm after the rice ...
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Comparing the results obtained by using both technologies, it can be seen that the aggregates washed in high pressure washer contained ten times less dust at the water consumption level between 1–1.2 m3/Mg/h. Energy consumption for the high pressure washer was 1.08 MJ/Mg. At the same time,
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Overview. The soundness test determines an aggregate's resistance to disintegration by weathering and, in particular, freeze-thaw cycles. Aggregates that are durable (resistant …
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