419 research outputs found
Pursuit-evasion predator-prey waves in two spatial dimensions
We consider a spatially distributed population dynamics model with excitable
predator-prey dynamics, where species propagate in space due to their taxis
with respect to each other's gradient in addition to, or instead of, their
diffusive spread. Earlier, we have described new phenomena in this model in one
spatial dimension, not found in analogous systems without taxis: reflecting and
self-splitting waves. Here we identify new phenomena in two spatial dimensions:
unusual patterns of meander of spirals, partial reflection of waves, swelling
wavetips, attachment of free wave ends to wave backs, and as a result, a novel
mechanism of self-supporting complicated spatio-temporal activity, unknown in
reaction-diffusion population models.Comment: 15 pages, 15 figures, submitted to Chao
HPV-negative cervical cancer: a distinct type of the uterine cervix with poor prognosis
The real-time PCR method was used to study cervical scrapings from 116 patients with stag
ΠΠΎΠΊΡΠ°ΡΠ΅Π½Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π½ΠΈΠΊΡΠ² ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΎΡΡΠ² Π· Π²ΠΈΡΠΈΠΌΠΈ Π½Π΅ΡΠΎΠ·βΡΠΌΠ½ΠΈΠΌΠΈ ΠΌΠ°Π³Π½ΡΡΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π°ΠΌΠΈ ΡΠ»ΡΡ ΠΎΠΌ Π·ΠΌΡΠ½ΠΈ ΡΠΎΡΠΌΡΠ²Π°Π½Π½Ρ ΠΊΡΡΠ³ΠΎΠ²ΠΈΡ Π²ΠΈΡΠΊΡΠ² ΠΎΠ±ΠΌΠΎΡΠΊΠΈ
Introduction. With the adoption of standards to reduce losses in transformers it is necessary to change the design of transformers that remain unchanged. Further energy saving is possible with the use of non-traditional technical solutions for the improvement of transformers. Problem. In order to reduce idle losses, the curved magnetic circuits of power transformers are carried out in the form of low-volume circuits. Windings are injected into assembled magnetic conductors by shuttle machines. The shuttle of windings provides technological gaps in winding windows, which results in an increase in size, metal capacity and losses. Goal. Rationale for transformer performance improvement by excluding process gaps in winding windows. Methodology. The definition of the change in transformer indicators is performed using optimization functions of the dimensionless indicators of the technological level. The adequacy of the functions is confirmed by the calculation of the mass of the electromagnetic system and the losses of the transformer. The figures of the compact analogue are calculated from the named serial analogue. Results. The result is a reduction in mass and a loss in the compactness of the transformer. Originality. The improvement of the indicators and the simplification of the winding technology are provided by a change in the design of insulating frames of winding coils. Winding on the rods is ensured by rotating the outer part of the composite insulating frame. Practical significance. Replacement the design of the windings of transformer with power of 40 kVA of 1000 V voltage class with a spatially twisted, small-dimensional magnetic conductor on a compact analogue leads to a reduction in mass and overall dimensions by 15 % and (17-18) %. Efficiency increases by 0.3 %.ΠΠΈΠΊΠΎΠ½Π°Π½ΠΎ Π°Π½Π°Π»ΡΠ· ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎ-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
ΠΎΡΠΎΠ±Π»ΠΈΠ²ΠΎΡΡΠ΅ΠΉ Π΅Π»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΡΡΠ½ΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΎΡΡΠ² Π· Π²ΠΈΡΠΈΠΌΠΈ Π½Π΅ΡΠΎΠ·βΡΠΌΠ½ΠΈΠΌΠΈ ΠΌΠ°Π³Π½ΡΡΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π°ΠΌΠΈ Ρ ΠΊΡΡΠ³ΠΎΠ²ΠΈΠΌΠΈ ΡΡΠ²ΠΎΡΡΡΡΠΈΠΌΠΈ ΠΊΠΎΠ½ΡΡΡΠ°ΠΌΠΈ ΡΡΡΠΈΠΆΠ½ΡΠ² ΡΠ° ΠΎΠ±ΠΌΠΎΡΠΊΠΎΠ²ΠΈΡ
Π²ΠΈΡΠΊΡΠ². ΠΠ°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½ΠΎ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ ΠΎΠ±ΠΌΠΎΡΠΊΠΎΠ²ΠΎΡ ΠΊΠΎΡΡΡΠΊΠΈ Π· Π·ΠΎΠ²Π½ΡΡΠ½ΡΠΎΡ ΡΡΡ
ΠΎΠΌΠΎΡ ΡΠ° Π²Π½ΡΡΡΡΡΠ½ΡΠΎΡ Π½Π΅ΡΡΡ
ΠΎΠΌΠΎΡ ΡΠ°ΡΡΠΈΠ½Π°ΠΌΠΈ ΠΎΠΏΠΎΡΠ½ΠΎ-ΡΠ·ΠΎΠ»ΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΡΠΊΠ°ΡΡ ΡΠ° Π·Π°ΠΌΡΠ½Ρ Π²ΠΌΠΎΡΠΊΠΈ Π²ΠΈΡΠΊΡΠ² Π½Π° ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡ Π½Π°ΠΌΠΎΡΠΊΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΠΎ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ Π·Π°ΠΌΡΡΡΡ ΡΠΎΠ²Π½ΠΈΠΊΠΎΠ²ΠΎΡ Π²ΠΌΠΎΡΠ°Π½ΠΎΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ Π²ΠΈΠΊΠΎΠ½Π°Π½Π½Ρ ΠΎΠ±ΠΌΠΎΡΠΊΠΈ Π· Π·ΠΎΠ²Π½ΡΡΠ½ΡΠΎΡ ΡΠ°ΡΡΠΈΠ½ΠΎΡ ΡΠ·ΠΎΠ»ΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΡΠΊΠ°ΡΠ°, ΡΠΎ ΠΎΠ±Π΅ΡΡΠ°ΡΡΡΡΡ, ΠΏΡΠΈΠ·Π²ΠΎΠ΄ΠΈΡΡ Π΄ΠΎ ΠΏΠΎΠ»ΡΠΏΡΠ΅Π½Π½Ρ ΠΌΠ°ΡΠΎΠ³Π°Π±Π°ΡΠΈΡΠ½ΠΈΡ
Ρ Π΅Π½Π΅ΡΠ³Π΅ΡΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠΊΠ°Π·Π½ΠΈΠΊΡΠ² ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΎΡΠ°
The Euclid Archive Processing and Data Distribution Systems: A Distributed Infrastructure for Euclid and Associated Data
The Euclid Archive System is an ambitious information system, which sits at the heart of the Euclid Science Ground Segment. It is a joint development between the Euclid Consortium and the ESAC Science Data Centre. It encompases both Euclid data and the large volume of associated ground based data (e.g. KiDS, DES and LSST). The Euclid Science Ground Segment consists of the Euclid Science Operations Centre and ten national Science Data Centres. The large data volumes demand that data transfer is minimized and that the processing is taken to the data. This is supported by the Euclid Archive Data Processing System and the Euclid Archive Distributed Data System. The Data Processing System consists of a central metadata repository, which contains the information necessary to process any data item and full data lineage of any data product created. The Distributed Data System provides a cloud solution with a node at each of the national Science Data Centres, which controls data storage and transfer. It supports a large number of storage types, including POSIX, iRODS, gridftp and Xrootd. No limitations are placed on the storage implemented at an individual SDC. Further more, the user of the system needs no knowledge of where data is located. Jobs will be started at the most appropriate locations, or data transferred as necessary
Target and (Astro-)WISE technologies - Data federations and its applications
After its first implementation in 2003 the Astro-WISE technology has been
rolled out in several European countries and is used for the production of the
KiDS survey data. In the multi-disciplinary Target initiative this technology,
nicknamed WISE technology, has been further applied to a large number of
projects. Here, we highlight the data handling of other astronomical
applications, such as VLT-MUSE and LOFAR, together with some non-astronomical
applications such as the medical projects Lifelines and GLIMPS, the MONK
handwritten text recognition system, and business applications, by amongst
others, the Target Holding. We describe some of the most important lessons
learned and describe the application of the data-centric WISE type of approach
to the Science Ground Segment of the Euclid satellite.Comment: 9 pages, 5 figures, Proceedngs IAU Symposium No 325 Astroinformatics
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