Understanding the Generation of Dissolved Silica in Thermal Projects: Theoretical Progress

2008 ◽  
Vol 47 (01) ◽  
Author(s):  
H.F. Thimm
Keyword(s):  
Dissolved Silica ◽  
Theoretical Progress

PRECIPITATION OF DISORDERED DOLOMITE CATALYZED BY DISSOLVED SILICA AND IMPLICATIONS

2020 ◽  
Author(s):  
Yihang Fang ◽  
◽  
Huifang Xu ◽  
Huifang Xu
Keyword(s):  
Dissolved Silica

scholarly journals The Problem of Coordination and the Pursuit of Structural Constraints in Psychology

2021 ◽  
pp. 174569162097477
Author(s):  
David Kellen ◽  
Clintin P. Davis-Stober ◽  
John C. Dunn ◽  
Michael L. Kalish
Keyword(s):  
Functional Relationship ◽  
Historical Analysis ◽  
Structural Constraints ◽  
Theoretical Concepts ◽  
Psychological Science ◽  
Theoretical Progress ◽  
Slow Progress ◽  
Empirical Means ◽  
The Way

Paul Meehl’s famous critique detailed many of the problematic practices and conceptual confusions that stand in the way of meaningful theoretical progress in psychological science. By integrating many of Meehl’s points, we argue that one of the reasons for the slow progress in psychology is the failure to acknowledge the problem of coordination. This problem arises whenever we attempt to measure quantities that are not directly observable but can be inferred from observable variables. The solution to this problem is far from trivial, as demonstrated by a historical analysis of thermometry. The key challenge is the specification of a functional relationship between theoretical concepts and observations. As we demonstrate, empirical means alone cannot determine this relationship. In the case of psychology, the problem of coordination has dramatic implications in the sense that it severely constrains our ability to make meaningful theoretical claims. We discuss several examples and outline some of the solutions that are currently available.

Theoretical progress in the H2+ molecular ion: towards electron to proton mass ratio determinationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 103-107 ◽  
Author(s):  
J.-Ph. Karr ◽  
L. Hilico ◽  
V. I. Korobov
Keyword(s):  
High Resolution ◽  
Mass Ratio ◽  
Theoretical Determination ◽  
Atomic Systems ◽  
The Road ◽  
Theoretical Progress ◽  
Proton Mass ◽  
Accuracy Level ◽  
Ratio Determination

High resolution ro-vibrational spectroscopy of H 2+ or HD+ can lead to a significantly improved determination of the electron to proton mass ratio me/mp if the theoretical determination of transition frequencies becomes sufficiently accurate. We report on recent theoretical progress in the description of the hyperfine structure of H 2+ , as well as first steps in the evaluation of radiative corrections at order mα7. Completion of the latter calculation should allow us to reach the projected 10−10 accuracy level and open the road to mass ratio determination.

Philosophical Issues and Nursing Science

2017 ◽  
Vol 31 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Pamela G. Reed
Keyword(s):  
Scientific Knowledge ◽  
Theory Development ◽  
Nursing Science ◽  
Theoretical Progress

The author of this article introduces a new column that will explore philosophical issues of concern to nurse scientists. In this initial column, I review the general terrain of philosophy in nursing science and explore some philosophical issues relevant to theory development. One conclusion is that inquiry into philosophical issues may help expand our repertoire of conceptual tools useful in building scientific knowledge and facilitating theoretical progress.

Effect of dissolved silica on photocatalytic water purification with a TiO2 ceramic catalyst

2019 ◽  
Vol 150 ◽  
pp. 40-46 ◽  
Author(s):  
Nobuaki Negishi ◽  
Masami Sugasawa ◽  
Yukari Miyazaki ◽  
Yuki Hirami ◽  
Setsuko Koura
Keyword(s):  
Water Purification ◽  
Dissolved Silica ◽  
Tio2 Ceramic ◽  
Ceramic Catalyst

Treatment of cooling tower blowdown water containing silica, calcium and magnesium by electrocoagulation

2009 ◽  
Vol 60 (9) ◽  
pp. 2345-2352 ◽  
Author(s):  
Z. Liao ◽  
Z. Gu ◽  
M. C. Schulz ◽  
J. R. Davis ◽  
J. C. Baygents ◽  
...  
Keyword(s):  
Cooling Tower ◽  
Target Species ◽  
Organic Additives ◽  
Dissolved Silica ◽  
Ion Removal ◽  
Ph Values ◽  
Silica Removal ◽  
Initial Ph ◽  
Aluminum Electrodes ◽  
Calcium And Magnesium

This research investigated the effectiveness of electrocoagulation using iron and aluminium electrodes for treating cooling tower blowdown (CTB) waters containing dissolved silica (Si(OH)4), Ca2 +  and Mg2 + . The removal of each target species was measured as a function of the coagulant dose in simulated CTB waters with initial pH values of 5, 7, and 9. Experiments were also performed to investigate the effect of antiscaling compounds and coagulation aids on hardness ion removal. Both iron and aluminum electrodes were effective at removing dissolved silica. For coagulant doses ≤3 mM, silica removal was a linear function of the coagulant dose, with 0.4 to 0.5 moles of silica removed per mole of iron or aluminium. Iron electrodes were only 30% as effective at removing Ca2 +  and Mg2 +  as compared to silica. There was no measurable removal of hardness ions by aluminium electrodes in the absence of organic additives. Phosphonate based antiscaling compounds were uniformly effective at increasing the removal of Ca2 +  and Mg2 +  by both iron and aluminium electrodes. Cationic and amphoteric polymers used as coagulation aids were also effective at increasing hardness ion removal.

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