Polymeric Complexes of Polyaniline as Anticorrosion Coatings

1997 ◽  
Vol 488 ◽  
Author(s):  
R. J. Racicot ◽  
S. C. Yang ◽  
R. Brown
Keyword(s):  
Driving Forces ◽  
Molecular Design ◽  
Electrochemical Impedance ◽  
Conductive Polymer ◽  
Molecular Engineering ◽  
Mechanistic Study ◽  
Polymeric Complex ◽  
The Past ◽  
Anticorrosion Coatings ◽  
Polymer Metal

AbstractDuring the past few years there has been a strong interest in developing conducting polymers as an alternative to the traditional anticorrosion coatings. One of the driving forces for this research comes from the need for an environmentally friendly chromate-free anticorrosion coating for highstrength light weight aluminum alloys. The possibilities for a new scratch-tolerant paint for steel prompted the development of conductive polymer anticorrosion paints. By molecular engineering, we have synthesized a double-strand polymeric complex of polyaniline that is suitable as an anticorrosion paint on metals in low pH environments. In this article, we will discuss (1) the molecular design for solubility and adhesion, (2) the effectiveness of the electroactive coating under electrochemical impedance tests, and (3) a mechanistic study of the anticorrosion mechanism by examining the polymer/metal interfacial interactions.

Indicators of Possible Driving Forces for the Spread of Quechua and Aymara Reflected in the Archaeology of Cuzco

2012 ◽  
Author(s):  
GORDON F. McEWAN
Keyword(s):  
Cultural History ◽  
Driving Force ◽  
Driving Forces ◽  
Alternative Possibilities ◽  
The Past ◽  
The North ◽  
The Andes ◽  
Inca Empire ◽  
Culture History ◽  
History Of

Linguistic studies have shown that the traditional idea that the expansion of the Inca Empire was the driving force behind the spread of all Quechua cannot be correct. Across much of its distribution, Quechua has far greater time-depth than can be accounted for by the short-lived Inca Empire. Linguistics likewise suggests that Aymara spread not from the south into Cuzco in the late Pre-Inca period, but also from an origin to the north. Alternative explanations must be sought for the expansion of these language families in the culture history of the Andes. Archaeological studies over the past two decades now provide a broad, generally agreed-upon outline of the cultural history of the Cuzco region. This chapter applies those findings to examine alternative possibilities for the driving forces that spread Quechua and Aymara, offering a clearer cross-disciplinary view of Andean prehistory.

Associations Between Driving Forces to Adopt ICT and Benefits Derived from that Adoption in Medical Practices in Australia

2011 ◽  
pp. 652-668
Author(s):  
R. C. MacGregor ◽  
P. N. Hyland ◽  
C. Harvie
Keyword(s):  
Decision Making ◽  
Information And Communication Technology ◽  
Communication Technology ◽  
Driving Forces ◽  
Perceived Benefits ◽  
Medical Practices ◽  
The Past ◽  
Ict Adoption ◽  
Information And Communication ◽  
The Way

Information and Communication Technology (ICT) is today seen as a catalyst for change in the way work is carried out. Over the past decade there have been a number of studies examining both the decision-making behind ICT adoption (the driving forces for adoption) as well as the perceived benefits from that adoption. However, no studies have attempted to determine, or indeed map whether emphasis given to specific driving forces have manifested in differing perceptions of perceived benefits. The purpose of this chapter is to examine whether emphasis on particular driving forces for ICT adoption are associated with the perception of particular benefits. A study was undertaken amongst 198 Australian GPs. Results suggest that greater emphasis on improving communications gives rise to higher perceived benefits both in terms of communications and practice effectiveness, while emphasis on other drivers does not significantly alter the perception of benefits derived from adoption.

scholarly journals Recent Advances in Non-Fullerene Acceptors of the IDIC/ITIC Families for Bulk-Heterojunction Organic Solar Cells

2020 ◽  
Vol 21 (21) ◽  
pp. 8085
Author(s):  
Giacomo Forti ◽  
Andrea Nitti ◽  
Peshawa Osw ◽  
Gabriele Bianchi ◽  
Riccardo Po ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Molecular Design ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Fine Tuning ◽  
The Past ◽  
Recent Advances ◽  
Group Modification ◽  
End Capping

The introduction of the IDIC/ITIC families of non-fullerene acceptors has boosted the photovoltaic performances of bulk-heterojunction organic solar cells. The fine tuning of the photophysical, morphological and processability properties with the aim of reaching higher and higher photocurrent efficiencies has prompted uninterrupted worldwide research on these peculiar families of organic compounds. The main strategies for the modification of IDIC/ITIC compounds, described in several contributions published in the past few years, can be summarized and classified into core modification strategies and end-capping group modification strategies. In this review, we analyze the more recent advances in this field (last two years), and we focus our attention on the molecular design proposed to increase photovoltaic performance with the aim of rationalizing the general properties of these families of non-fullerene acceptors.

scholarly journals Empirical evidence for definitions of episode, remission, recovery, relapse and recurrence in depression: a systematic review

2018 ◽  
Vol 28 (5) ◽  
pp. 544-562 ◽  
Author(s):  
P. L. de Zwart ◽  
B. F. Jeronimus ◽  
P. de Jonge
Keyword(s):  
Depressive Symptoms ◽  
Depressive Episode ◽  
Rating Scale ◽  
Driving Forces ◽  
Evidence Based ◽  
Limited Data ◽  
Major Depressive ◽  
The Past ◽  
Duration Threshold ◽  
Hamilton Rating Scale

Aims.For the past quarter of a century, Frank et al.’s (1991) consensus-based definitions of major depressive disorder (MDD) episode, remission, recovery, relapse and recurrence have been the paramount driving forces for consistency in MDD research as well as in clinical practice. This study aims to review the evidence for the empirical validation of Frank et al.’s proposed concept definitions and to discuss evidence-based modifications.Methods.A literature search of Web of Science and PubMed from 1/1/1991 to 08/30/2017 identified all publications which referenced Frank et al.’s request for definition validation. Publications with data relevant for validation were included and checked for referencing other studies providing such data.Results.A total of 56 studies involving 39 315 subjects were included, mainly presenting data to validate the severity and duration thresholds for defining remission and recovery. Most studies indicated that the severity threshold for defining remission should decrease. Additionally, specific duration thresholds to separate remission from recovery did not add any predictive value to the notion that increased remission duration alleviates the risk of reoccurrence of depressive symptoms. Only limited data were available to validate the severity and duration criteria for defining a depressive episode.Conclusions.Remission can best be defined as a less symptomatic state than previously assumed (Hamilton Rating Scale for Depression, 17-item version (HAMD-17) ⩽4 instead of ⩽7), without applying a duration criterion. Duration thresholds to separate remission from recovery are not meaningful. The minimal duration of depressive symptoms to define a depressive episode should be longer than 2 weeks, although further studies are required to recommend an exact duration threshold. These results are relevant for researchers and clinicians aiming to use evidence-based depression outcomes.

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