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Search Results: 1 - 10 of 144613 matches for " F. Garibaldi "
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High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A
F. Garibaldi,P. Bydzovsky,E. Cisbani
Physics , 2012, DOI: 10.1016/j.nuclphysa.2013.02.054
Abstract: The characteristics of the Jefferson Lab electron beam, together with those of the experimental equipment, offer a unique opportunity to study hypernuclear spectroscopy via electromagnetic induced reactions. Experiment 94-107 started a systematic study on 1p-shell targets, $^{12}C$, $^{9}Be$ and $^{16}O$. For $^{12}C$ for the first time measurable strength in the core-excited part of the spectrum between the ground state and the p state was shown in $^{12}_{\Lambda}B$ spectrum. A high-quality $^{16}_{\Lambda}N$ spectrum was produced for the first time with sub-MeV energy resolution. A very precise $\Lambda$ binding energy value for $^{16}_{\Lambda}N$, calibrated against the elementary $(e,e'K^+)$ reaction on hydrogen, has also been obtained. $^{9}_{\Lambda}Li$ spectrum shows some disagreement in strength for the second and third doublet with respect to the theory.
Orthogonal involution on algebras of degree 16 and the Killing form of E8
Skip Garibaldi
Mathematics , 2007,
Abstract: We exploit various inclusions of algebraic groups to give a new construction of groups of type E8, determine the Killing forms of the resulting E8's, and define an invariant of central simple algebras of degree 16 with orthogonal involution "in I^3", equivalently, groups of type D8 with a half-spin representation defined over the base field. The determination of the Killing form is done by restricting the adjoint representation to various twisted forms of PGL2 and requires very little computation. An appendix by Kirill Zainoulline contains a type of "index reduction" result for groups of type D.
The Rost invariant has zero kernel for quasi-split trialitarian groups
Skip Garibaldi
Mathematics , 2010,
Abstract: The Book of Involutions includes the NON-trivial parts of a proof that the kernel of the Rost invariant is zero for quasi-split trialitarian groups. We record the missing (mechanical) details here. This note is recorded here on the arxiv only for the convenience of readers who like the style of The Book and obviously does not merit publication. A proof in Harder's style can be found in a paper by Chernousov (see the bibliography).
Outer automorphisms of algebraic groups and determining groups by their maximal tori
Skip Garibaldi
Mathematics , 2010, DOI: 10.1307/mmj/1339011524
Abstract: We give a cohomological criterion for existence of outer automorphisms of a semisimple algebraic group over an arbitrary field. This criterion is then applied to the special case of groups of type D_2n over a global field, which completes some of the main results from the paper "Weakly commensurable arithmetic groups and isospectral locally symmetric spaces" (Pub. Math. IHES, 2009) by Prasad and Rapinchuk and gives a new proof of a result from another paper by the same authors.
Orthogonal representations of twisted forms of SL2
Skip Garibaldi
Mathematics , 2007, DOI: 10.1090/S1088-4165-08-00335-X
Abstract: For every absolutely irreducible orthogonal representation of a twisted form of SL2 over a field of characteristic zero, we compute the "unique" symmetric bilinear form that is invariant under the group action. We also prove the analogous result for Weyl modules in prime characteristic (including characteristic 2) and an isomorphism between two symmetric bilinear forms given by binomial coefficients.
Models for photo- and electro-production of K^+ in view of new data
P. Bydzovsky,F. Cusanno,S. Frullani,F. Garibaldi,M. Iodice,M. Sotona,G. M. Urciuoli
Physics , 2003,
Abstract: Predictions of isobaric and Regge models are compared with the latest experimental data (Bonn,JLab) to select among the models those providing a satisfactory description of the data. Only the Saclay-Lyon and MAID models are in a reasonable agreement with both photo- and electro-production data ranging up to about 2.5 GeV.
Comportamento dos pre?os históricos do leite no Rio Grande do Sul, Brasil
Viana, Jo?o Garibaldi Almeida;Zen, Bárbara;Karlec, Fábio;Souza, Renato Santos de;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000200026
Abstract: the objective of this study is to analyse tendency behaviour, seasonality and price cycles of real prices paid to milk farmers in rio grande do sul between 1973 and 2007, as well as the evolution of consumer prices and commercialization margins. the study was based on historical price series of nominal monthly milk prices paid to the producer and by consumers in rio grande do sul, obtained through emater/rs and iepe/ufrgs, respectively. the nominal prices were deflated for december 2007 according to the igp-di of the fgv. consumer and farmer price indexes, seasonal indexes, relative cycles and product commercialization margins were calculated. it was observed that the prices paid to the farmer presented a decreasing tendency throughout the whole historical series. the milk market presented historical cycles generally regular until the beginning of the 1980s, and from 1987 on, a strong tendency toward change in farmer and consumer price indexes. the commercialization margin of milk increased during the period analysed, placing itself between 27% and 69%.
The Nature of Culture and Keystones
Ann Garibaldi,Nancy Turner
Ecology and Society , 2004,
Cultural Keystone Species: Implications for Ecological Conservation and Restoration
Ann Garibaldi,Nancy Turner
Ecology and Society , 2004,
Abstract: Ecologists have long recognized that some species, by virtue of the key roles they play in the overall structure and functioning of an ecosystem, are essential to its integrity; these are known as keystone species. Similarly, in human cultures everywhere, there are plants and animals that form the contextual underpinnings of a culture, as reflected in their fundamental roles in diet, as materials, or in medicine. In addition, these species often feature prominently in the language, ceremonies, and narratives of native peoples and can be considered cultural icons. Without these "cultural keystone species," the societies they support would be completely different. An obvious example is western red-cedar (Thuja plicata) for Northwest Coast cultures of North America. Often prominent elements of local ecosystems, cultural keystone species may be used and harvested in large quantities and intensively managed for quality and productivity. Given that biological conservation and ecological restoration embody human cultures as crucial components, one approach that may improve success in overall conservation or restoration efforts is to recognize and focus on cultural keystone species. In this paper, we explore the concept of cultural keystone species, describe similarities to and differences from ecological keystone species, present examples from First Nations cultures of British Columbia, and discuss the application of this concept in ecological restoration and conservation initiatives.
Italo Campodónico Garibaldi
Revista Chilena de Obstetricia y Ginecología , 2006,
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