Effect of silver coating on electrochemical performance of 0.5Li2MnO3.0.5 LiMn1/3Ni1/3Co1/3O2 cathode material for lithium-ion batteries

Journal of Solid State Electrochemistry - In this work, a Li-rich layered 0.5Li2MnO3.0.5LiMn1/3Ni1/3Co1/3O2 (LMNCO) pristine cathode material synthesized with a glycine-nitrate combustion method is...     

Silver(I) Complexes of 2,2′;6′,4″-Terpyridine: The Formation of Discrete Dimers versus Helical Polymers is Anion Dependent

The ligand 2,2′;6′,4″-terpyridine combines a chelating bipyridine group and terminal pyridine donor into a single molecule which is incapable of bonding all three donor N-atoms to a single metal center. Upon chelation to Ag(I), a pro-chiral, building block is produced which can subsequently aggregate by terminal coordination of the pyridine nitrogen. Two forms are possible; a discrete bimetallic complex with a center of symmetry and an infinite helical coordination polymer. Which of these structures occurs is dependent upon the counter anion.     

Metal induced molecular nano-extraction

We have previously devised a “scorpion” like system which is composed of a zigzag (8,0) single walled carbon nanotube attached to a 20 ringed graphene sheet by a glycine dimer species. Theoretical density functional theory calculations on a potential mechanism driven by a metal induced charge transfer process has been proposed for the extraction of molecules from nanotubes.     

[80]Fullerene–amino acid interactions: Theoretical insights

This work reports the interactions of a C₈₀ fullerene species with the 20 naturally occurring amino acids. As a result of the analysis of multiple configurations, we have determined that the most stable C₈₀ complexes form with thiol containing amino acids. The stabilities of the resulting complexes have been classified according to biochemical classifications that are used to develop trends among the calculated data. The computed trends in the dissociation energies are related to the backbone structure of the corresponding amino acids. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2010     

Ueber den Mechanismus der Agglutination

Ohne Zusammenfassung     

High-frequency gratings for applications to microoptical ellipsometer/polarimeter systems

We report on experimental results which we conducted on manufactured microretarder arrays. The array consists of miniaturized retarder elements with different orientations of their fast axes. Diffractive phase retardation elements are chosen as microretarder elements since nanostructuring techniques such as electron beam lithography and successive reactive ion etching allow in principle an effortless way to arrange the microretarders as desired by the application. In this paper, we discuss the fabrication and the experimental results of manufactured retarder arrays. Furthermore, their use for potential applications in the fields of polarimetry is discussed.     

Fragmentation associated with Lévy processes using snake

We consider the height process of a Lévy process with no negative jumps, and its associated continuous tree representation. Using Lévy snake tools developed by Le Gall-Le Jan and Duquesne-Le Gall, with an underlying Poisson process, we construct a fragmentation process, which in the stable case corresponds to the self-similar fragmentation described by Miermont. For the general fragmentation process we compute a family of dislocation measures as well as the law of the size of a tagged fragment. We also give a special Markov property for the snake which is of its own interest.      

Learning beginning algebra with spreadsheets in a computer intensive environment

This study is part of a large research and development project aimed at observing, describing and analyzing the learning processes of two seventh grade classes during a yearlong beginning algebra course in a computer intensive environment (CIE). The environment includes carefully designed algebra learning materials with a functional approach, and provides students with unconstrained freedom to use (or not use) computerized tools during the learning process at all times. This paper focuses on the qualitative and quantitative analyses of students’ work on one problem, which serves as a window through which we learn about the ways students worked on problems throughout the year. The analyses reveal the nature of students’ mathematical activity, and how such activity is related to both the instrumental views of the computerized tools that students develop and their freedom to use them. We describe and analyze the variety of approaches to symbolic generalizations, syntactic rules and equation solving and the many solution strategies pursued successfully by the students. On that basis, we discuss the strengths of the learning environment and the open questions and dilemmas it poses.