38 research outputs found
Symplectic Cobordism in Small Dimensions and a Series of Elements of Order Four
We present the structure of symplectic cobordism ring in dimensions
up to 51 and give a construction of an infinite series of elements ,
, of order four in this ring, where . The key element of the series is in dimension 103.Comment: 117 pages, 18 table
Long-term observation of amphibian populations inhabiting urban and forested areas in Yekaterinburg, Russia
This article presents data derived from a 36 year-long uninterrupted observational study of amphibian populations living in the city and vicinity of Yekaterinburg, Russia. This area is inhabited by six amphibian species. Based on a degree of anthropogenic transformation, the urban territory is divided into five highly mosaic zones characterized by vegetation, temperature, and a distinctive water pollution profile. Population data is presented year-by-year for the number of animals, sex ratio, and species-specific fecundity including the number and quality of spawns for the following amphibian species: Salamandrella keyserligii, Rana arvalis, R. temporaria, Lissotriton vulgaris, and Pelophylax ridibundus. These data provide an excellent opportunity to assess an urban environment from an animal population-wide perspective, as well as revealing the forces driving animal adaptation to the anthropogenic transformation of habitats
Calculation principles for a superconducting inductive FCL and a current-limiting transformer
We present general principles of the parameters calculation and application
of two power devices: an inductive fault current limiter and a current-limiting
transformer. Both the devices are based on the superconducting - normal state
transition in a superconducting switching element magnetically coupled with a
primary winding. The relationships between the design parameters of the devices
and the limited current, losses and temperature in the superconducting element
were investigated. It is shown that, in spite of similarity, the devices have
distinctive features manifested in different depths of the fault current
limitation. The case of performance of the superconducting winding in the form
of HTS BSCCO hollow cylinders is analyzed. Basic parameters of the devices are
evaluated for their application in 45 MVA power circuit. Problems of the
transition into the normal state and recovery of the superconducting state in
the switching element are discussed.Comment: 26 pages including 11 figures and 1 table, submitted to IEEE
Transactions on Applied Superconductivit