S. G. Mason—A retrospective

Ven, Theo G. M. van de

doi:10.1016/0301-9322(90)90016-c

Cited by 3 publications

(4 citation statements)

References 41 publications

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“…A more plausible explanation concerns the effect of polymer dosage on the extension of adsorbed polymer tails from the fiber surface. For interactions between spheres and cylinders, van de Ven (15,16) has shown that in the absence of colloidal forces the spheres (filler) would follow a dosed trajectory around the (circular) periphery of the cylinder (fiber) without becoming attached. For this trajectory there is a distance of minimum approach; the bridging polymer must be able to span this distance for retention to occur.…”

Section: Resultsmentioning

confidence: 99%

The effects of retention aid distribution in the furnish

Stratton¹,

Miller²

1993

Nordic Pulp &Amp; Paper Research Journal

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Section: Resultsmentioning

confidence: 99%

The effects of retention aid distribution in the furnish

Stratton¹,

Miller²

1993

Nordic Pulp &Amp; Paper Research Journal

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Section: Circular-linear Weighted Correlation Of Theta Sequences Prementioning

confidence: 99%

“…quantifying theta sequences [7,8] were not well-suited to developmental data: the preferred theta phase of CS cell firing changed during development (see Fig 4a) meaning that it was not possible to define a consistent set of phase by position 'quadrants' on the theta sequence, which would be needed for a 'quadrant score' [7]. Furthermore, maturing theta sequences did not always approximate a linear band, meaning that a linear band fitting approach [8] could not be used. Instead, the tendency of decode probabilities to systematically change throughout the theta cycle was assessed by correlating position and theta cycle time bin, weighted by the posterior probability for each bin (analogous to the weighted correlation of a probability posterior in [5]).…”

Section: Circular-linear Weighted Correlation Of Theta Sequences Prementioning

confidence: 99%

Coordinated emergence of hippocampal replay and theta sequences during post-natal development

Muessig

Lasek

Varsavsky

et al. 2018

Preprint

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Hippocampal place cells encode an animal's current position in space during exploration[1]. During subsequent sleep, hippocampal network activity recapitulates patterns observed during recent experience: place cells with overlapping spatial firing fields during locomotion show a greater tendency to co-fire ('reactivation') [2] and temporally ordered and compressed sequences of place cell firing observed during wakefulness are reinstated ('replay') [3-5]. Reactivation and replay are thought to be network mechanisms underlying memory consolidation [6-10].Compressed sequences of place cell firing also occur during exploration: during each cycle of the theta oscillation, the set of active place cells shifts from those signalling positions behind to those signalling positions ahead of an animal's current location [11,12]. These 'theta sequences' have been linked to spatial planning [13].Here we demonstrate that, before weaning (post-natal day 21, P21), offline place cell activity reflects predominantly stationary locations in recently visited environments. By contrast, sequential place cell firing, describing extended trajectories through space during exploration ('theta sequences') and subsequent sleep ('replay'), emerge gradually after weaning in a coordinated fashion, possibly due to a protracted decrease in the threshold for experiencedriven plasticity.

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“…Hence selective shear mechanisms are operating that favor the coagulation of similar sized particles (9,10) .…”

mentioning

confidence: 99%

Physiocochemical and Hydrodynamic Aspects of Fines and Fillers Retention

van de Ven

1989

Trans. Of the IXth Fund. Res. Symp. Cambridge, 1989

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From the results of model studies on well-characterized systems, valuable conclusions can be drawn regarding several phenomena occurring in papermaking suspensions relevant to fines and fillers retention. We have shown that long range hydrodynamic interactions are operating between small particles (such as fillers) and spheroids (such as fibers) subjected to simple shear, preventing small particles from approaching large ones to within distances where colloidal forces become important. We can expect similar effects in papermaking suspensions, resulting in very low efficiencies for the deposition of fillers or fines on fibers. The efficiency can be improved by high molecular weight polymers which adsorb on the particles and can reduce the minimum distance of approach between a filler and a fiber. From model experiments on the deposition of T102 particles on cellophane, it can be concluded that the electrostatic forces also play an important role in fines and fillers retention. Usually no deposition occurs far below a critical deposition concentration (CDC) of electrolyte, slow deposition occurs just before the CDC and fast deposition above the CDC. Charged polymers, such as cationic polyelectrolytes, are most effective in retention because they can reduce the gap between a filler and a fiber during an encounter, and they ensure that electrostatic repulsion is negligible. Resides increasing the efficiency of deposition, retention aids can also increase the bond strength between a filler and a fiber, thus preventing or minimizing the rupture of fiber-filler bonds.

show abstract

S. G. Mason—A retrospective

Cited by 3 publications

References 41 publications

The effects of retention aid distribution in the furnish

The effects of retention aid distribution in the furnish

Coordinated emergence of hippocampal replay and theta sequences during post-natal development

Physiocochemical and Hydrodynamic Aspects of Fines and Fillers Retention

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