scholarly journals New methods of controlled monolayer-to-multilayer deposition of Pt for designing electrocatalysts at an atomic level

2001 ◽  
Vol 66 (11-12) ◽  
pp. 887-898 ◽  
Author(s):  
S.R. Brankovic ◽  
J.X. Wang ◽  
R.R. Adzic
Keyword(s):  
Co Oxidation ◽  
Electrode Surface ◽  
Redox Reaction ◽  
Atomic Level ◽  
The Other ◽  
Spontaneous Deposition ◽  
Co Tolerance ◽  
New Methods ◽  
Ru Nanoparticles ◽  
Local Cell

Two new methods for monolayer-to-multileyer Pt deposition are presented. One involves Pt deposition by the replacement of an UPD metal monolayer on an electrode surface and the other the spontaneous deposition of Pt on Ru. The first method, exemplified by the replacement of a Cu monolayer on a Au(111) surface, occurs as a spontaneous irreversible redox reaction in which the Cu monolayer is oxidized by Pt cations, which are reduced and simultaneously deposited. The second method is illustrated by the deposition of Pt on a Ru(0001) surface and on carbon-supported Ru nanoparticles. This deposition takes place upon immersion of a UHV-prepared Ru(0001) crystal or Ru nanoparticles, reduced in H2, in a solution containing PtCl6 2- ions. The oxidation of Ru to RuOH by a local cell mechanism appears to be coupled with Pt deposition. This method facilitates the design of active Pt-Ru catalysts with ultimately low Pt loadings. Only a quarter of a monolayer of Pt on Ru nanoparticles yields an electrocatalyst with higher activity and CO tolerance for H2/CO oxidation than commercial Pt-Ru alloy electrocatalysts with considerably higher Pt loadings.

Non-Cottrell Behavior of the Dopamine Redox Reaction Observed on the Carbon Fibre Microelectrode by the Double-Step Voltcoulometry

2004 ◽  
Vol 69 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Katarína Gmucová ◽  
Jozef Orlický ◽  
Juraj Pavlásek
Keyword(s):  
Carbon Fibre ◽  
Redox Reaction ◽  
Measured Data ◽  
The Other ◽  
Diffusion Current ◽  
Double Step ◽  
Dopamine Concentration ◽  
Living Body ◽  
Carbon Fibre Microelectrode ◽  
Experimental Errors

The redox reaction of the neurotransmitter dopamine at the carbon fibre microelectrode was studied by several electrochemical methods. It was found that under conditions usual in a living body, the diffusion current fullfils, within experimental errors, the behavior theoretically predicted by the Cottrell equation. Nevertheless, attention should be paid to the fact that unsupported or weakly supported conditions give rise to a non-Cottrell response of diffusion current. Moreover, similar changes were observed if the dopamine concentration was either lower such as several units of μmol l-1, or about 100 μmol l-1 or higher. The non-Cottrell behavior of diffusion current involves the nonlinearity of the dopamine calibration curve obtained by pulse techniques. The present work is aimed at pointing out that such behavior of the measured data could lead to misinterpretation of the obtained dopamine concentration. Similar features could be also achieved for the other catecholamines.

CO tolerance and CO oxidation at Pt and Pt–Ru anode catalysts in fuel cell with polybenzimidazole–H3PO4 membrane

2010 ◽  
Vol 55 (20) ◽  
pp. 6073-6080 ◽  
Author(s):  
A.D. Modestov ◽  
M.R. Tarasevich ◽  
V.Ya. Filimonov ◽  
E.S. Davydova
Keyword(s):  
Fuel Cell ◽  
Co Oxidation ◽  
Anode Catalysts ◽  
Co Tolerance

scholarly journals Error Analysis for a Noisy Lacunary Cubic Spline Interpolation and a Simple Noisy Cubic Spline Quasi Interpolation

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Feng-Gong Lang ◽  
Xiao-Ping Xu
Keyword(s):  
Error Analysis ◽  
Error Bounds ◽  
Interpolation Method ◽  
Spline Interpolation ◽  
Cubic Spline ◽  
The Other ◽  
Cubic Spline Interpolation ◽  
Numerical Tests ◽  
New Methods ◽  
Noisy Function

We mainly present the error analysis for two new cubic spline based methods; one is a lacunary interpolation method and the other is a very simple quasi interpolation method. The new methods are able to reconstruct a function and its first two derivatives from noisy function data. The explicit error bounds for the methods are given and proved. Numerical tests and comparisons are performed. Numerical results verify the efficiency of our methods.

Gender and National Differences in Attitudes toward Same-Gender Touch

1994 ◽  
Vol 78 (3) ◽  
pp. 1027-1034 ◽  
Author(s):  
Frank N. Willis ◽  
Vicki A. Rawdon
Keyword(s):  
Cultural Differences ◽  
Female Students ◽  
Cross Cultural ◽  
The Other ◽  
Male And Female ◽  
New Methods ◽  
Cross Cultural Differences ◽  
National Differences ◽  
The Us ◽  
Same Gender

Women have been reported to be more positive about same-gender touch, but cross-cultural information about this touch is limited. Male and female students from Chile (n = 26), Spain (n = 61), Malaysia (n = 32), and the US (n = 77) completed a same-gender touch scale. As in past studies, US women had more positive scores than US men. Malaysians had more negative scores than the other three groups. Spanish and US students had more positive scores than Chilean students. National differences in attitudes toward particular types of touch were also noted. The need for new methods for examining cross-cultural differences in touch was discussed.

scholarly journals BIOLOGICAL CONTROL IN LEAF-CUTTING ANTS, Atta sexdens (HYMENOPTERA: FORMICIDAE), USING PATHOGENIC FUNGI

2021 ◽  
Vol 45 ◽  
Author(s):  
Tarcísio Marcos Macedo Mota Filho ◽  
Luis Eduardo Pontes Stefanelli ◽  
Roberto da Silva Camargo ◽  
Carlos Alberto Oliveira de Matos ◽  
Luiz Carlos Forti
Keyword(s):  
Biological Control ◽  
Chemical Control ◽  
Pathogenic Fungi ◽  
Behavioral Changes ◽  
The Other ◽  
Fungus Garden ◽  
Atta Sexdens ◽  
Main Method ◽  
New Methods ◽  
Leaf Cutting

ABSTRACT Chemical control using toxic baits containing the active ingredient sulfluramid at 0.3% (w/w) is the main method for controlling leaf-cutting ants of the genera Atta and Acromyrmex. However, since 2009, when sulfluramid was included in Annex B of the Stockholm Convention on Persistent Organic Pollutants, there has been an intense search for new methods that are efficient in controlling these insects. Among said new methods, biological control using pathogenic fungi has shown promising results in laboratory conditions. The objective of this study, given the context presented, was to assess the potential of the fungi Beauveria bassiana and Trichoderma harzianum in controlling Atta sexdens. Colonies of A. sexdens were exposed to the fungi by means of formulated baits provided in a foraging chamber, or of suspensions sprayed on the fungus garden, and had their behavioral changes recorded for 21 days. For both formulations, concentrations of 10 and 20% (w/w) of the fungi being studied were used. The results allowed concluding that baits containing 10 and 20% (w/w) of the fungi B. bassiana and T. harzianum were not efficient in controlling colonies of A sexdens. On the other hand, spraying suspensions of 20% (w/w) of B. bassiana and 10% and 20% (w/w) of T. harzianum was efficient and resulted in 100% mortality of the colonies 11, 9 and 7 days after application, respectively. These findings indicate that the fungi B. bassiana and T. harzianum are promising as agents for the control of A. sexdens colonies, when sprayed on the fungus garden, although there are still some challenges as to their use related to the development of technologies for the application of the pathogen.

Political Economy Inside the Strategy of Line Game

2022 ◽  
pp. 832-845
Author(s):  
Annesha Biswas ◽  
Tinanjali Dam ◽  
Joseph Varghese Kureethara ◽  
Sankar Varma
Keyword(s):  
Game Theory ◽  
Political Economy ◽  
21St Century ◽  
Behavioural Economics ◽  
Pareto Efficiency ◽  
The Other ◽  
New Methods ◽  
Simple Rules ◽  
Winning Strategies ◽  
Person Game

In today's world, the concept of the game and game theory is turned into new methods of knowing and understanding some of the human behaviours followed by society. In the 21st century, behavioural economics plays a major role in understanding the concept of the `line' game and hence the strategies followed by it. It is a country game played in many parts of India. It is a two-person game with very simple rules and moves. It can be played indoors. Students play the game during the break-outs. The game keenly and minutely determines the objectivity of the game and the behaviour of the players involved inside the game and the way one starts moving helps the other players to understand what one is trying to portray through the game whether it is winning or losing. The strategies involved can be put forth and looked upon from different perspectives. Referring to one such perspective, it can be looked at from a concept of Pareto efficiency, a microeconomic concept. It helps develop logical skills and learn winning strategies.

Engineering Ni3+ Cations in NiO Lattice at the Atomic Level by Li+ Doping: The Roles of Ni3+ and Oxygen Species for CO Oxidation

ACS Catalysis ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 8033-8045 ◽  
Author(s):  
Xianglan Xu ◽  
Lin Li ◽  
Jin Huang ◽  
Hua Jin ◽  
Xiuzhong Fang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Atomic Level ◽  
Oxygen Species ◽  
Li Doping

Actionable knowledge with the help of method repositories

2020 ◽  
Vol 36 (2) ◽  
pp. 149-156
Author(s):  
Hero Khezri ◽  
Peyman Rezaei-Hachesu ◽  
Reza Ferdousi
Keyword(s):  
Rapid Growth ◽  
Design Methodology ◽  
Scientific Research ◽  
The Other ◽  
Research Papers ◽  
Content Type ◽  
Actionable Knowledge ◽  
New Methods ◽  
The People ◽  
Scientific Terms

Purpose Nowadays, there is a rapid growth in different sciences that has led to thousands of publications in the form of scientific research papers. The readers of these papers are generally the people that are involved in science (i.e. researchers, students, teachers and professors). On the other hand, practitioners rarely use these articles as a resource to learn and apply new methods. They prefer an easy to understand, step-by-step guide (i.e. cookbook) helping them skip over the difficult scientific terms and structures. Therefore, because of a shortage of tools in this space, it takes practitioners many years to use newly developed methods. Design/methodology/approach The purpose of this study is to review the literature on verified repositories and presents the necessity of method repositories. Findings This paper aims to introduce method repositories as new tools to bridge the gap between science and practice. Originality/value Method repositories presented in this paper act as an easy to understand guide for newly developed methods in specific fields.

Facile enhancement of the durability and CO tolerance of CB/PtRu by poly(2,5-benzimidazole) coating via in situ polymerization

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 96416-96420 ◽  
Author(s):  
Zehui Yang ◽  
Xinxin Yu ◽  
Fang Luo
Keyword(s):  
In Situ Polymerization ◽  
Co Tolerance ◽  
Ru Nanoparticles

Ru nanoparticles were stabilized when coated with a polymer formed in situ from its monomer.

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