scholarly journals The Seascale cluster: a probable explanation

1999 ◽  
Vol 81 (1) ◽  
pp. 3-5 ◽  
Author(s):  
Richard Doll
Keyword(s):  
Probable Explanation ◽  
Cluster A

Qualificando o caráter ‘regressivo’ da especialização industrial do Brasil

2014 ◽  
Vol 15 (1) ◽  
Author(s):  
Ana Urraca Ruiz ◽  
Jorge Nogueira de Paiva Britto ◽  
Karla Sarmento Gonçalves de Souza
Keyword(s):  
Cluster A

Este trabalho tem como objetivo revisar a forma como é observada a estrutura industrial brasileira e avaliar se esta pode ser qualificada como de ‘regressiva’. Para isto será utilizado: (i) uma classificação industrial específica construída a partir de um conjunto de indicadores relativos aos resultados de inovação; (ii) a evolução do crescimento das exportações mundiais para cada cluster contemplado; (iii) os efeitos de encadeamento (up e downstream) de cada cluster. A partir desta caracterização, o trabalho revisa a evolução da produção industrial, a estrutura de exportações e o desempenho industrial do Brasil entre 1996 e 2011. O artigo conclui que não é possível qualificar a estrutura produtiva brasileira como regressiva por diversas razões. Primeiro, porque uma parte significativa de sua especialização em industrias tradicionais que exploram recursos naturais tem representativos efeitos encadeamento e um nível de conteúdo tecnológico médio-alto (petróleo).  Segundo, porque não ha diferenças significativas na agregação de valor entre as atividades com alto e baixo grau de inovatividade, ou seja, entre atividades onde o Brasil se especializa e não se especializa. Terceiro, porque o crescimento da produtividade real está positiva e significativamente relacionado com a evolução da estrutura industrial em termos de valor agregado, ou seja, a diversificação industrial contribuiu positivamente ao crescimento da produtividade industrial.

Electroanalytical chemistry of vanadium complexes. Comparison of the voltammetric features of amavadine with those of the vanadium complexes with iminodiacetic acid and methyliminodiacetic acid

1989 ◽  
Vol 54 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Roland Meier ◽  
Harald Frank ◽  
Reinhard Kirmse ◽  
Reiner Salzer ◽  
Joachim Stach ◽  
...  
Keyword(s):  
Iminodiacetic Acid ◽  
Vanadium Complexes ◽  
Reduction Mechanism ◽  
Reversible Process ◽  
Electroanalytical Chemistry ◽  
Probable Explanation ◽  
Chemical Sense ◽  
Ece Mechanism ◽  
Methyliminodiacetic Acid

The voltammetric behaviour of amavadine (AV) was found to be considerably different from that of the complexes of VO2+ with methyliminodiacetic acid (MIDA) and iminodiacetic acid (IDA). To get an insight in the rather complicated reduction mechanism of the latter complexes the reductions of V(III) (MIDA) and V(III) (IDA) have been studied for comparison. The species V(III) (MIDA)2 and V(III) (IDA)2 are reduced to the appropriate V(II) complexes in a chemically reversible process. VO(MIDA)2 and VO(IDA)2 are reduced to the same complexes via an ECE mechanism. The investigation of the electroreduction of AV shows that this process is not reversible in the chemical sense. As a probable explanation, the conclusion was drawn that AV and the usual V(IV)O-iminocarboxylato complexes differ in their structures.

scholarly journals A CLASS OF GENES AFFECTING B FACTOR-REGULATED DEVELOPMENT IN SCHIZOPHYLLUM COMMUNE

Genetics ◽  
1976 ◽  
Vol 82 (3) ◽  
pp. 423-428
Author(s):  
Celia Dubovoy
Keyword(s):  
Genetic Factor ◽  
Schizophyllum Commune ◽  
Nuclear Migration ◽  
Complex Pattern ◽  
Developmental Phase ◽  
Linear Map ◽  
Incompatibility Factor ◽  
Complementation Groups ◽  
Cluster A ◽  
Specific Phase

ABSTRACT Twelve mutations affecting nuclear migration, a major developmental phase in Schizophyllum commune, display a complex pattern of complementation and recombination. They are expressed only when a genetic factor controlling this phase of development, the B incompatibility factor, is operative. All twelve mutations are linked to the B factor, nine in a cluster and three in distinct loci outside the cluster. A linear map cannot be constructed from the frequency of recombination. Complementation maps are not linear. There is little correlation between the complementation groups and the groups based on recombination. Many pairs of mutations that do not complement recombine with frequencies of 1.1% to 26.9%. The genes represented by the twelve mutations are located in a linked group of about 18 known genes involved in the specific phase of development controlled by the B factor.

A Highly Luminescent Hexanuclear Molybdenum Cluster - A Promising Candidate toward Photoactive Materials

2012 ◽  
Vol 2012 (19) ◽  
pp. 3107-3111 ◽  
Author(s):  
Kaplan Kirakci ◽  
Pavel Kubát ◽  
Michal Dušek ◽  
Karla Fejfarová ◽  
Václav Šícha ◽  
...  
Keyword(s):  
Promising Candidate ◽  
Molybdenum Cluster ◽  
Photoactive Materials ◽  
Cluster A

A novel tetrarhodium cluster: a face-to-face carbonyl-bridged dimer of a dirhodium macrocyclic hexaamine

1987 ◽  
Vol 26 (16) ◽  
pp. 2644-2646 ◽  
Author(s):  
J. Michael Johnson ◽  
John E. Bulkowski ◽  
Arnold L. Rheingold ◽  
Bruce C. Gates
Keyword(s):  
Face To Face ◽  
Cluster A

scholarly journals On the distribution of the scattered Röntgen radiation

1912 ◽  
Vol 86 (589) ◽  
pp. 478-494 ◽  
Keyword(s):  
Wave Front ◽  
Scattered Radiation ◽  
Single Electron ◽  
Primary Beam ◽  
Secondary Radiation ◽  
Electromagnetic Forces ◽  
Probable Explanation ◽  
The Mean ◽  
Most Probable Explanation

The fact that a substance through which Röntgen rays from a focus tube are passing becomes itself a source of secondary Röntgen rays has long- been known. The most probable explanation was given by Prof. Sir J. J. Thomson. If a Röntgen pulse is due to the acceleration of a charged electron, then if the electrons in the atom are free to move under the action of the electromagnetic forces in the wave front of the primary Röntgen pulse, their motion will be accelerated during the passage of the latter through the atom, and they will themselves become sources of secondary Röntgen radiation. Considering only a single electron, the intensity of the secondary radiation at any angle α with the direction of motion will be proportional to sin 2 α . If the primary beam is unpolarised, the motion of the electron may have any direction in the plane at right angles to the primary beam. The intensity of the scattered radiation in the direction θ with the primary beam is thus the mean of all the values of sin 2 α for that direction. It can easily be shown that this is proportional to 1 + cos 2 θ . If I' θ is the intensity of the scattered radiation in the direction θ , we thus have I' θ = I' π /2 (1 + cos 2 θ ).

Cluster From Cluster: A Quantitative Approach to Magic Gold Nanoclusters [Au25(SR)18]‐

2021 ◽  
Author(s):  
Zhen Lei ◽  
Jiao-Jiao Li ◽  
Zi-Ang Nan ◽  
Zhan-Guo Jiang ◽  
Quan-Ming Wang
Keyword(s):  
Gold Nanoclusters ◽  
Quantitative Approach ◽  
Cluster A
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