A new geometrical setting for classical field theories is introduced. This description is strongly inspired in the one due to Skinner and Rusk for singular lagrangians systems. For a singular field theory a constraint algorithm is developed that gives a final constraint submanifold where a well-defined dynamics exists. The main advantage of this algorithm is that the second order condition is a...

MAPPING. L.R. Gaddis, J.A. Skinner, Jr., T. Hare, K. Tanaka, B.R. Hawke, P. Spudis, B. Bussey, C. Pieters, and D. Lawrence, U.S. Geological Survey, Astrogeology Program, 2255 N. Gemini Drive, Flagstaff, AZ ([email protected]), PGD/SOEST, Univ. Hawaii, Honolulu, HI; Johns Hopkins Univ., Baltimore, MD; Dept. Geological Sciences, Brown Univ., Providence, RI; Los Alamos National Laboratory, Los Alam...

Derek J. Roberts ([email protected]) Craig N. Jenne ([email protected]) Chad G. Ball ([email protected]) Corina Tiruta ([email protected]) Caroline Leger ([email protected]) Zhengwen Xiao ([email protected]) Peter D. Faris ([email protected]) Paul B. McBeth ([email protected]) Christopher J. Doig ([email protected]) Christine R. Skinner (christine...

The k-cosymplectic Lagrangian and Hamiltonian formalisms of first-order field theories are reviewed and completed. In particular they are stated for singular almost-regular systems. After that, both formalisms are unified by giving an extension of the Skinner-Rusk formulation on classical mechanics for first-order field theories. M.S. Classification (2000): 70S05, 53D05, 53Z05

Simona Neumann,1,2 Joao M. Braz,1,2 Kate Skinner,1,2 Ida J. Llewellyn-Smith,3 and Allan I. Basbaum1,2 Departments of 1Anatomy and 2Physiology and W. M. Keck Foundation Center for Integrative Neuroscience, University of California, San Francisco, San Francisco, California 94158, and 3Cardiovascular Medicine and Center for Neuroscience, Flinders University, Bedford Park, South Australia 5042, Aus...

M.N. Bester, J.P. Bloomer, R.J. van Aarde, B.H. Erasmus, P.J.J. van Rensburg, J.D. Skinner, P.G. Howell & T.W. Naude Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria, 0002 South Africa Department of Infectious Diseases, Faculty of Veterinary Sciences, University of Pretoria, Onderstepoort, 0110 South Africa Department of Pharmacology and Toxicolo...

Skinner and colleagues (Research Article, 23 January 2015, p. 395), based on metacarpal trabecular bone structure, argue that Australopithecus africanus employed human-like dexterity for stone tool making and use 3 million years ago. However, their evolutionary and biological assumptions are misinformed, failing to refute the previously existing hypothesis that human-like manipulation preceded ...

" An adequate formulation of the interaction between an organism and its environment must always specify three things (1) the occasion upon which a response occurs, (2) the response itself and (3) the reinforcing consequences. The interrelations among them are the contingencies of reinforcement. " Burrhus F. Skinner

The first aim of this paper is to extend the Skinner-Rusk formalism on classical mechanics for first-order field theories. The second is to generalize the definition and properties of the evolution K-operator on classical mechanics for first-order field theories using in both cases Günther’s formalism (k-symplectic formalism). M.S. Classification (2000): 70S05, 53D05, 53Z05

BACKGROUND Operant behavioural testing provides a highly sensitive and automated method of exploring the behavioural deficits seen in rodent models of neurodegenerative diseases, including Huntington's disease (HD). The delayed matching to position (DMTP) and delayed non-matching to position (DNMTP) tasks probe spatial learning and working memory and when applied serially they can be used to me...