172 research outputs found
Stirring by blinking rotlets in a bounded Stokes flow
A blinking rotlet model is used for the analysis of stirring in a Stokes flow in a rectangular domain. After the two-dimensional biharmonic equation is solved analytically, the associated velocity field of a pair of blinking rotlets positioned symmetrically on the y -axis, is used studying the stirring qualities of this blinking rotlet model. Contour kinematic simulations are performed in order to
obtain information about the chaotic behaviour of a blob of passive tracer material put in this flow field
New classes of exact solutions of three-dimensional Navier-Stokes equations
New classes of exact solutions of the three-dimensional unsteady
Navier-Stokes equations containing arbitrary functions and parameters are
described. Various periodic and other solutions, which are expressed through
elementary functions are obtained. The general physical interpretation and
classification of solutions is given.Comment: 11 page
Jacobi multipliers, non-local symmetries and nonlinear oscillators
Constants of motion, Lagrangians and Hamiltonians admitted by a family of
relevant nonlinear oscillators are derived using a geometric formalism. The
theory of the Jacobi last multiplier allows us to find Lagrangian descriptions
and constants of the motion. An application of the jet bundle formulation of
symmetries of differential equations is presented in the second part of the
paper. After a short review of the general formalism, the particular case of
non-local symmetries is studied in detail by making use of an extended
formalism. The theory is related to some results previously obtained by
Krasil'shchi, Vinogradov and coworkers. Finally the existence of non-local
symmetries for such two nonlinear oscillators is proved.Comment: 20 page
Π£ΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΡ ΡΠΏΠ΅ΡΠΌΠ°ΡΠΎΠ³Π΅Π½Π΅Π·Π° ΠΈ ΠΏΡΠΎΡΠ²Π»Π΅Π½ΠΈΡ ΠΎΡΠ±ΠΎΡΠ° Π½Π° ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΌ ΠΈ ΠΈΠ½Π΄ΠΈΠ²ΠΈΠ΄ΡΠ°Π»ΡΠ½ΠΎΠΌ ΡΡΠΎΠ²Π½ΡΡ Ρ Π½Π΅Π·ΡΠ΅Π»ΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΠΈΡΠ΅Π»Π΅ΠΉ Pelophylax esculentus complex
Pelophylax esculentus is an interspecific hybrid which reproduces hemiclonally by crossing with the parental species (P. ridibundus or P.Β lessonae). The structure of hemiclonal population systems is of great interest. The majority of investigations into populations of water frogs deal with samples of mature animals, while subadults are less studied. We collected a random sample of 73 small water frogs from three localities in the Siverskyi Donets River floodplain. All frogs were measured, injected with colchicines and killed after anesthesia. WeΒ determined the species specifity, sex, age and ploidy of every individual. In addition, we measured testis length and studied the germ cells of all males by means of karyological analysis. We calculated the portion of triploids in the largest subsample from the vicinity of the Biological Station of V.N. Karazin Kharkiv National University and carried out a meta-analysis of previous publications dealing with composition of green frog samples from this locality. The proportion of triploids in our sample appeared to be approximately the same as 12Β years ago. However, this proportion in our sample differed significantly from that obtained in recent samples of green frogs belonging to other age groups (adults and metamorphs) from the same locality. The share of triploids of P. esculentus is the lowest in the sample of metamorphs. This proportion increases in froglets because of early death of representatives of parental species which originated from hybrid-hybrid crossing. Then the number of triploids among adult P. esculentus individuals declines again probably because of their lower viability compared to diploids. We have revealed that subadult diploids have erythrocytes smaller than 28 microns, while triploidsβ erythrocytes exceed 27 microns. Therefore, in borderline cases true ploidy could be determined only by the karyological technique. The average ratio between testis length and body length appeared to be larger in the parental species than in both diploid and triploid hybrids. Karyological analysis has revealed that P. esculentus had significantly lower portions of spermatocytes I with normal karyotype (13 bivalents) in the testis in comparison with P. ridibundus, but this value increases in adult hybrids. We suggest that increasing of spermatogenesis stability in adult frogs as opposed to subadults might be the consequence of both selection of germ cell lines in the testis and more frequent survival of individuals with stable gametogenesis.Β ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π° ΡΠ»ΡΡΠ°ΠΉΠ½Π°Ρ Π²ΡΠ±ΠΎΡΠΊΠ° Π½Π΅ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
Π·Π΅Π»Π΅Π½ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΈΠ· Π‘Π΅Π²Π΅ΡΡΠΊΠΎ-ΠΠΎΠ½Π΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π½ΡΡΠ° ΡΠ°Π·Π½ΠΎΠΎΠ±ΡΠ°Π·ΠΈΡ Pelophylax esculentus complex. Π£ ΠΊΠ°ΠΆΠ΄ΠΎΠΉ ΠΎΡΠΎΠ±ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΠΏΠΎΠ», Π²ΠΎΠ·ΡΠ°ΡΡ (ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΊΠ΅Π»Π΅ΡΠΎΡ
ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΠΈ), ΠΏΠ»ΠΎΠΈΠ΄Π½ΠΎΡΡΡ ΠΈ ΠΏΡΠΈΠ½Π°Π΄Π»Π΅ΠΆΠ½ΠΎΡΡΡ ΠΊ P.Β esculentus ΠΈΠ»ΠΈ P. ridibundus, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΈΠ·ΠΌΠ΅ΡΡΠ»ΠΈ Π΄Π»ΠΈΠ½Ρ ΡΠ΅Π»Π° ΠΈ Π΄Π»ΠΈΠ½Ρ ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ² Ρ ΡΠ°ΠΌΡΠΎΠ². ΠΠΎ ΠΌΠ°Π·ΠΊΠ°ΠΌ ΠΊΡΠΎΠ²ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΡΠ΅Π΄Π½ΡΡ Π΄Π»ΠΈΠ½Ρ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ². ΠΠ· ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ² ΠΈΠ·Π³ΠΎΡΠ°Π²Π»ΠΈΠ²Π°Π»ΠΈ ΠΊΠ°ΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΡ, ΠΏΠΎ ΠΊΠΎΡΠΎΡΡΠΌ ΠΎΠΏΠΈΡΡΠ²Π°Π»ΠΈ ΠΊΠ°ΡΠΈΠΎΡΠΈΠΏΡ ΠΊΠ»Π΅ΡΠΎΠΊ Π²ΠΎ Π²ΡΠ΅ΠΌΡ ΠΌΠΈΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΌΠ΅ΠΉΠΎΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄Π΅Π»Π΅Π½ΠΈΠΉ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΠΌΠ΅ΡΠ°Π°Π½Π°Π»ΠΈΠ· ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π΄Π°Π½Π½ΠΎΠΉ ΠΈ ΠΏΡΠ΅Π΄ΡΠ΅ΡΡΠ²ΠΎΠ²Π°Π²ΡΠΈΡ
ΡΠ°Π±ΠΎΡ, Π² ΠΊΠΎΡΠΎΡΡΡ
ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΠΎΡΡΠ°Π² Π²ΡΠ±ΠΎΡΠΎΠΊ Π·Π΅Π»Π΅Π½ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΏΠΎΠΉΠΌΠ΅ Ρ. Π‘Π΅Π²Π΅ΡΡΠΊΠΈΠΉ ΠΠΎΠ½Π΅Ρ Π² ΠΎΠΊΡΠ΅ΡΡΠ½ΠΎΡΡΡΡ
ΠΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ°Π½ΡΠΈΠΈ Π₯Π°ΡΡΠΊΠΎΠ²ΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ½ΠΈΠ²Π΅ΡΡΠΈΡΠ΅ΡΠ° ΠΈΠΌΠ΅Π½ΠΈ Π.Π. ΠΠ°ΡΠ°Π·ΠΈΠ½Π°. ΠΠΎΠ»Ρ ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΡ
P. esculentus Π½ΠΈΠΆΠ΅ Π²ΡΠ΅Π³ΠΎ Ρ ΠΌΠ΅ΡΠ°ΠΌΠΎΡΡΠΎΠ², ΠΏΠΎΠ²ΡΡΠ°Π΅ΡΡΡ (Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ Π³ΠΈΠ±Π΅Π»ΠΈ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΠΈΡΠ΅Π»Π΅ΠΉ ΡΠΎΠ΄ΠΈΡΠ΅Π»ΡΡΠΊΠΎΠ³ΠΎ Π²ΠΈΠ΄Π°, ΠΏΠΎΡΠ²Π»ΡΡΡΠΈΡ
ΡΡ ΠΎΡ ΡΠΊΡΠ΅ΡΠΈΠ²Π°Π½ΠΈΡ Π³ΠΈΠ±ΡΠΈΠ΄ΠΎΠ²) Ρ Π½Π΅Π·ΡΠ΅Π»ΡΡ
ΠΎΡΠΎΠ±Π΅ΠΉ ΠΈ ΡΠ½ΠΈΠΆΠ°Π΅ΡΡΡ (ΠΈΠ·-Π·Π° Π±ΠΎΠ»ΡΡΠ΅ΠΉ ΡΠΌΠ΅ΡΡΠ½ΠΎΡΡΠΈ ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄ΠΎΠ²) Ρ ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
ΠΎΡΠΎΠ±Π΅ΠΉ. ΠΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΠ΅ Π»ΡΠ³ΡΡΠΊΠΈ ΠΈΠΌΠ΅ΡΡ Π΄Π»ΠΈΠ½Ρ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΠΌΠ΅Π½Π΅Π΅ 28 ΠΌΠΊΠΌ, ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΠ΅ β Π±ΠΎΠ»Π΅Π΅ 27 ΠΌΠΊΠΌ; Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ 27β28 ΠΌΠΊΠΌ ΠΏΠΎ Π΄Π»ΠΈΠ½Π΅ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΡΡΡΠ°Π½ΠΎΠ²ΠΈΡΡ ΠΏΠ»ΠΎΠΈΠ΄Π½ΠΎΡΡΡ Π½Π΅Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ. ΠΠ΅Π·ΡΠ΅Π»ΡΠ΅ P. esculentus ΠΈΠΌΠ΅ΡΡ ΡΠ΅Π½Π΄Π΅Π½ΡΠΈΡ ΠΊ Π·Π°Π΄Π΅ΡΠΆΠΊΠ΅ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π³ΠΎΠ½Π°Π΄ ΠΈ Π·Π½Π°ΡΠΈΠΌΠΎ Π±ΠΎΠ»ΡΡΠ΅Π΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ Π°Π½ΠΎΠΌΠ°Π»ΡΠ½ΡΡ
ΠΊΠ°ΡΠΈΠΎΡΠΈΠΏΠΎΠ² Π² ΠΌΠΈΡΠΎΠ·Π΅ ΠΈ ΠΌΠ΅ΠΉΠΎΠ·Π΅, ΡΠ΅ΠΌ P.Β ridibundus. ΠΠΎΠ²ΡΡΠ΅Π½ΠΈΠ΅ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΠΈ ΡΠΏΠ΅ΡΠΌΠ°ΡΠΎΠ³Π΅Π½Π΅Π·Π° Ρ ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π½Π΅Π·ΡΠ΅Π»ΡΠΌΠΈ ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ΠΌ ΠΊΠ°ΠΊ ΠΎΡΠ±ΠΎΡΠ° ΠΊΠ»Π΅ΡΠΎΡΠ½ΡΡ
Π»ΠΈΠ½ΠΈΠΉ Π²Π½ΡΡΡΠΈ ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ², ΡΠ°ΠΊ ΠΈ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π²ΡΠΆΠΈΠ²Π°Π½ΠΈΡ ΠΎΡΠΎΠ±Π΅ΠΉ Ρ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ ΡΡΡΠΎΠΉΡΠΈΠ²ΡΠΌ Π³Π°ΠΌΠ΅ΡΠΎΠ³Π΅Π½Π΅Π·ΠΎΠΌ.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π° ΡΠ»ΡΡΠ°ΠΉΠ½Π°Ρ Π²ΡΠ±ΠΎΡΠΊΠ° Π½Π΅ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
Π·Π΅Π»Π΅Π½ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΈΠ· Π‘Π΅Π²Π΅ΡΡΠΊΠΎ-ΠΠΎΠ½Π΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π½ΡΡΠ° ΡΠ°Π·Π½ΠΎΠΎΠ±ΡΠ°Π·ΠΈΡ Pelophylax esculentus complex. Π£ ΠΊΠ°ΠΆΠ΄ΠΎΠΉ ΠΎΡΠΎΠ±ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΠΏΠΎΠ», Π²ΠΎΠ·ΡΠ°ΡΡ (ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΊΠ΅Π»Π΅ΡΠΎΡ
ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΠΈ), ΠΏΠ»ΠΎΠΈΠ΄Π½ΠΎΡΡΡ ΠΈ ΠΏΡΠΈΠ½Π°Π΄Π»Π΅ΠΆΠ½ΠΎΡΡΡ ΠΊ P.Β esculentus ΠΈΠ»ΠΈ P. ridibundus, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΈΠ·ΠΌΠ΅ΡΡΠ»ΠΈ Π΄Π»ΠΈΠ½Ρ ΡΠ΅Π»Π° ΠΈ Π΄Π»ΠΈΠ½Ρ ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ² Ρ ΡΠ°ΠΌΡΠΎΠ². ΠΠΎ ΠΌΠ°Π·ΠΊΠ°ΠΌ ΠΊΡΠΎΠ²ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΡΠ΅Π΄Π½ΡΡ Π΄Π»ΠΈΠ½Ρ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ². ΠΠ· ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ² ΠΈΠ·Π³ΠΎΡΠ°Π²Π»ΠΈΠ²Π°Π»ΠΈ ΠΊΠ°ΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΡ, ΠΏΠΎ ΠΊΠΎΡΠΎΡΡΠΌ ΠΎΠΏΠΈΡΡΠ²Π°Π»ΠΈ ΠΊΠ°ΡΠΈΠΎΡΠΈΠΏΡ ΠΊΠ»Π΅ΡΠΎΠΊ Π²ΠΎ Π²ΡΠ΅ΠΌΡ ΠΌΠΈΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΌΠ΅ΠΉΠΎΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄Π΅Π»Π΅Π½ΠΈΠΉ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΠΌΠ΅ΡΠ°Π°Π½Π°Π»ΠΈΠ· ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π΄Π°Π½Π½ΠΎΠΉ ΠΈ ΠΏΡΠ΅Π΄ΡΠ΅ΡΡΠ²ΠΎΠ²Π°Π²ΡΠΈΡ
ΡΠ°Π±ΠΎΡ, Π² ΠΊΠΎΡΠΎΡΡΡ
ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΠΎΡΡΠ°Π² Π²ΡΠ±ΠΎΡΠΎΠΊ Π·Π΅Π»Π΅Π½ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΏΠΎΠΉΠΌΠ΅ Ρ. Π‘Π΅Π²Π΅ΡΡΠΊΠΈΠΉ ΠΠΎΠ½Π΅Ρ Π² ΠΎΠΊΡΠ΅ΡΡΠ½ΠΎΡΡΡΡ
ΠΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ°Π½ΡΠΈΠΈ Π₯Π°ΡΡΠΊΠΎΠ²ΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ½ΠΈΠ²Π΅ΡΡΠΈΡΠ΅ΡΠ° ΠΈΠΌΠ΅Π½ΠΈ Π.Π. ΠΠ°ΡΠ°Π·ΠΈΠ½Π°. ΠΠΎΠ»Ρ ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΡ
P. esculentus Π½ΠΈΠΆΠ΅ Π²ΡΠ΅Π³ΠΎ Ρ ΠΌΠ΅ΡΠ°ΠΌΠΎΡΡΠΎΠ², ΠΏΠΎΠ²ΡΡΠ°Π΅ΡΡΡ (Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ Π³ΠΈΠ±Π΅Π»ΠΈ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΠΈΡΠ΅Π»Π΅ΠΉ ΡΠΎΠ΄ΠΈΡΠ΅Π»ΡΡΠΊΠΎΠ³ΠΎ Π²ΠΈΠ΄Π°, ΠΏΠΎΡΠ²Π»ΡΡΡΠΈΡ
ΡΡ ΠΎΡ ΡΠΊΡΠ΅ΡΠΈΠ²Π°Π½ΠΈΡ Π³ΠΈΠ±ΡΠΈΠ΄ΠΎΠ²) Ρ Π½Π΅Π·ΡΠ΅Π»ΡΡ
ΠΎΡΠΎΠ±Π΅ΠΉ ΠΈ ΡΠ½ΠΈΠΆΠ°Π΅ΡΡΡ (ΠΈΠ·-Π·Π° Π±ΠΎΠ»ΡΡΠ΅ΠΉ ΡΠΌΠ΅ΡΡΠ½ΠΎΡΡΠΈ ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄ΠΎΠ²) Ρ ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
ΠΎΡΠΎΠ±Π΅ΠΉ. ΠΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΠ΅ Π»ΡΠ³ΡΡΠΊΠΈ ΠΈΠΌΠ΅ΡΡ Π΄Π»ΠΈΠ½Ρ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΠΌΠ΅Π½Π΅Π΅ 28 ΠΌΠΊΠΌ, ΡΡΠΈΠΏΠ»ΠΎΠΈΠ΄Π½ΡΠ΅ β Π±ΠΎΠ»Π΅Π΅ 27 ΠΌΠΊΠΌ; Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ 27β28 ΠΌΠΊΠΌ ΠΏΠΎ Π΄Π»ΠΈΠ½Π΅ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΡΡΡΠ°Π½ΠΎΠ²ΠΈΡΡ ΠΏΠ»ΠΎΠΈΠ΄Π½ΠΎΡΡΡ Π½Π΅Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ. ΠΠ΅Π·ΡΠ΅Π»ΡΠ΅ P. esculentus ΠΈΠΌΠ΅ΡΡ ΡΠ΅Π½Π΄Π΅Π½ΡΠΈΡ ΠΊ Π·Π°Π΄Π΅ΡΠΆΠΊΠ΅ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π³ΠΎΠ½Π°Π΄ ΠΈ Π·Π½Π°ΡΠΈΠΌΠΎ Π±ΠΎΠ»ΡΡΠ΅Π΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ Π°Π½ΠΎΠΌΠ°Π»ΡΠ½ΡΡ
ΠΊΠ°ΡΠΈΠΎΡΠΈΠΏΠΎΠ² Π² ΠΌΠΈΡΠΎΠ·Π΅ ΠΈ ΠΌΠ΅ΠΉΠΎΠ·Π΅, ΡΠ΅ΠΌ P.Β ridibundus. ΠΠΎΠ²ΡΡΠ΅Π½ΠΈΠ΅ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΠΈ ΡΠΏΠ΅ΡΠΌΠ°ΡΠΎΠ³Π΅Π½Π΅Π·Π° Ρ ΠΏΠΎΠ»ΠΎΠ²ΠΎΠ·ΡΠ΅Π»ΡΡ
Π»ΡΠ³ΡΡΠ΅ΠΊ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π½Π΅Π·ΡΠ΅Π»ΡΠΌΠΈ ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ΠΌ ΠΊΠ°ΠΊ ΠΎΡΠ±ΠΎΡΠ° ΠΊΠ»Π΅ΡΠΎΡΠ½ΡΡ
Π»ΠΈΠ½ΠΈΠΉ Π²Π½ΡΡΡΠΈ ΡΠ΅ΠΌΠ΅Π½Π½ΠΈΠΊΠΎΠ², ΡΠ°ΠΊ ΠΈ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π²ΡΠΆΠΈΠ²Π°Π½ΠΈΡ ΠΎΡΠΎΠ±Π΅ΠΉ Ρ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ ΡΡΡΠΎΠΉΡΠΈΠ²ΡΠΌ Π³Π°ΠΌΠ΅ΡΠΎΠ³Π΅Π½Π΅Π·ΠΎΠΌ
Lie symmetry analysis and exact solutions of the quasi-geostrophic two-layer problem
The quasi-geostrophic two-layer model is of superior interest in dynamic
meteorology since it is one of the easiest ways to study baroclinic processes
in geophysical fluid dynamics. The complete set of point symmetries of the
two-layer equations is determined. An optimal set of one- and two-dimensional
inequivalent subalgebras of the maximal Lie invariance algebra is constructed.
On the basis of these subalgebras we exhaustively carry out group-invariant
reduction and compute various classes of exact solutions. Where possible,
reference to the physical meaning of the exact solutions is given. In
particular, the well-known baroclinic Rossby wave solutions in the two-layer
model are rediscovered.Comment: Extended version, 24 pages, 1 figur
Experiment for Testing Special Relativity Theory
An experiment aimed at testing special relativity via a comparison of the
velocity of a non matter particle (annihilation photon) with the velocity of
the matter particle (Compton electron) produced by the second annihilation
photon from the decay Na-22(beta^+)Ne-22 is proposed.Comment: 7 pages, 1 figure, Report on the Conference of Nuclear Physics
Division of Russian Academy of Science "Physics of Fundamental Interactions",
ITEP, Moscow, November 26-30, 200
Dynamics of Vortex Pair in Radial Flow
The problem of vortex pair motion in two-dimensional plane radial flow is
solved. Under certain conditions for flow parameters, the vortex pair can
reverse its motion within a bounded region. The vortex-pair translational
velocity decreases or increases after passing through the source/sink region,
depending on whether the flow is diverging or converging, respectively. The
rotational motion of two corotating vortexes in a quiescent environment
transforms into motion along a logarithmic spiral in the presence of radial
flow. The problem may have applications in astrophysics and geophysics.Comment: 13 pages, 9 figure
Sustainable coexistence of the parental species and hemiclonal interspecific hybrids is provided by the variety of ontogenetic strategies
Factors determining the sustainability of Hemiclonal Population Systems in which the interspecies hybrids Pelophylax esculentus complex coexist with members of parental species were studied using a combination of empirical data and computer simulation modeling. The empirical data demonstrates the existence of different intrapopulation strategies by partitioning a sample of individuals into two groups on the basis of their body size at a given age and comparing selected groups in terms of factors such as growth rate, life span, femalesβ fecundity and the age at which breeding commences. Then by using simulation modeling, we study the probable importance of intrapopulation ontogenetic strategies for the stability of Pelophylax esculentus complex HPS
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