Fullerene research 19851993 braun t schubert astrid maczelka h vasvari l
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Symmetries and contraction schemes of the substructures are also analyzed. Though the developed countries published the majority of the world articles, however, the national concentration concerning landfill research has become more and more unconspicuous. We discuss more generally the effect of pentagons and heptagons on the growth morphologies of these tubules, and the constraints on the number of pentagonal defects imposed by tube closure. To test the ideas and calculations presented here, we predict that high frequency H 2 modes acquire a width of about 20% of their frequency in superconductive fullerenes, and soften by about 5% compared to the insulating fullerenes. This is done via the use of automatically generated keyword taxonomies, which increase reliability by allowing the growth potentials of subordinate technologies to be aggregated into the overall potential of larger categories. Using Euler's formula, we can obtain that the number í µí± 5 resp. From computations performed on a set of C40 and C60 fullerenes, we concluded that the four topological shape factors tested Λ -1 , Ω -1 , Λ 1 and Ω 1 could be successfully used to preselect the most stable fullerene isomers.

Chemistry and material fields gradually became the mainstream of the solar power research. In carbon smoke samples prepared from vaporized graphite at elevated quenching gas pressures e. The authorship pattern, document types involved and active Indian institutions co-coordinating research in this subject area have also been studied. General formulas are presented for the vertex numbers, , of pentagon+hexagon polyhedra of icosahedral, tetrahedral or dihedral symmetries. The research progress and the technological development has been investigated by many authors through the bibliometrics Porter 2005 Porter , 2007Losiewicz et al.

Augur analyses the diachronic relationships between research areas and is able to detect clusters of topics that exhibit dynamics correlated with the emergence of new research topics. Since the discovery of C60 by Kroto et al. This study explores a bibliometric approach to quantitatively review carbon cycling research and statistically assess its developments and trends during 1993—2013. Indian Association for the Cultivation of Science outperformed all other institutes in the country. Iijima: Nature, 354, 56 1991 27 7. Attention is presently given to results for the crystal structure of K3C60. More specifc, research might focus on membranes related research.

. The medical research output of eleven mid-size countries were compared with the aid of scientometric indicators. A fulleréntudomány legtermelékenyebb 108 szerzője közül l. This new bibliometric method can help relevant researchers realize the panorama of global risk assessment research, and establish the further research direction. A nemzetközi közös feltalálói tevékenység képe Habár a nemzetközi együttműködés jól ismert jelenség az alapkutatást közlő folyóiratcikkek esetében és ez a fullerénkutatás során is megfigyelhető, a 4. The major areas include electronic applications, which still is a topic of much research effort.

An icosahedral fullerene may be considered as a tessellation of the sphere specified by an ordered pair of integers, or as a tightly wound spiral of faces. Bibliometrics, firstly introduced by Pritchard 1969 , was an effective method which had been widely used to analyze scientific production and research trends Wang and Ho 2011. In this paper, we characterize k-resonant toroidal polyhexes H p, 1, t. Over the past 24 years, there has been a notable growth in publication outputs. Green M L H, Rosseinsky M J , Tsang E S C , Elsveier, Amsterdam , 1996, 31. When sublimed wit Cââ and Cââ, they formed an air-stable film containing principally LaCââ, LaCââ, LaCââ, and LaCââ.

It is a well-indexed overview of the journal literature on a topic for which the 1996 Nobel Prize in Chemistry was awarded. Also, a set of recommendations based on findings was provided to construct a better environment for cooperation and to improve solar energy researches. With the synthesis of macroscopic quantities of buckminsterfullerene C60 and the higher fullerenes C70, C76, C78, etc. In this formula the number of hexagonal faces is missing. The goal is approximation methods that are rapid enough to systematically analyze entire isomer spaces consisting of millions of molecules, so as to identify structures with desired properties.

Our results reveal that yearly production of adsorption-related scientific articles increased steadily over the investigation period. A thin film showed a resistance transition with an onset temperature of 16 K and essentially zero resistance near 5 K. In an inert atmosphere it condenses to form hollow, spheroidal fullerenes1—4. There are only four surfaces in which a fullerene can be embedded: the sphere, projective plane, torus and Klein bottle. Részletesebb esettanulmányt kellene készíteni ezeknek a modelleknek a racionalitásával és érvényességével kapcsolatban. Franciaország a legelső hét között van mind a négy rangsorban. The usual spherical fullerenes have 12 pentagons; elliptic fullerenes, 6; and toroidal and Klein-bottle fullerenes, none.

Meanwhile, fullerene publications grew at much lower rates, just 4. De Solla Price: Little Science, Big Science, Columbia Univ. Prassides K , Kluwer Academic Publishers, Dordrecht,1994. We also computed hyper-Zagreb index, first multiple Zagreb index, second multiple Zagreb index, and forgotten index of these networks. Kadish K M , Ruoff R S , Electrochemical Society Inc. Among them, the following eight elements with the atomic numbers from 22 to 29, i. If a fullerene is defined as a finite trivalent graph made up solely of pentagons and hexagons, embedding in only four surfa ces is possi ble: the sphere, torus , Klei n bott le, and proje ctiv e ellipti c plane.

Let G be a graph with a perfect matching. Kroto: Nature, 318, 162 1985 30 5. Bibliometric methods are used to rank countries, institutions, and scientists, contributing to the carbon nanostructures research. Starting with a possible generalization of the Aboav-Weaire law, this paper presents a new method, which is designated primarily to the topological characterization of finite cellular systems defined on an unbounded, closed and orientable surface, and composed of a finite set of combinatorial polygons. Megvizsgáltuk a fullerénkémiai alkalmazásokkal kapcsolatos szabadalmaztatási tevékenységét és kimutatjuk, hogy az irodalomban fellelhető egyes pesszimista megnyilvánulások ellenére e területen számos olyan biztató elem található, melyek várható gyakorlati fejlődést ígérnek. Ecohydrology, an interdisciplinary subject connecting ecology and hydrology, has developed rapidly in recent years. Publication trends were analyzed by the retrieved results in publication type and language, characteristics of articles outputs, country, subject categories and journals, and the frequency of title-words and keywords used.