3,711 research outputs found
Thermodynamics of graviton condensate and the Kiselev black hole
No full textTesis (Master in Physics)--Pontificia Universidad Católica de Chile, 2020In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.In this thesis, we will present the thermodynamic study of a model that considers
the black hole as a condensation of gravitons (55) (56). We will obtain a correction to
the Hawking temperature and a negative pressure for a black hole of mass M. In this
way, the graviton condensate, which is assumed to be at the critical point defined by
the condition µch=0, will have well-defined thermodynamic quantities P, V , Th, S, and
U as any other Bose-Einstein condensate. We will also discuss the Kiselev black hole,
which has the capacity to parametrize the most well-known spherically symmetric black
holes. We will show that this is true, even at the thermodynamic level. Finally, we will
present a new metric, which we will call the BEC-Kiselev black hole, that will allow us
to extend the graviton condensate to the case of solutions with different types of the
energy-momentum tensor.2020-08-2
Microscopia de força piezoeléctrica de relaxors ferroeléctricos
Get PDFDoutoramento em Ciência e Engenharia de MateriaisNesta tese, ferroeléctricos relaxor (I dont know uf the order is correct) de base
Pb das familias (Pb,La)(Zr,Ti)O3 (PLZT), Pb(Mg1/3,Nb2/3)O3-PbTiO3 (PMN-PT),
Pb(Zn1/3,Nb2/3)O3-PbTiO3 (PZN-PT) foram investigados e analisados. As
propriedades ferroeléctricas e dieléctricas das amostras foram estudadas por
métodos convencionais de macro e localmente por microscopia de força
piezoeléctrica (PFM).
Nos cerâmicos PLZT 9.75/65/35 o contraste da PFM à escala nanometrica _
foi investigado em função do tamanho e orientação dos grãos. Apurou-se que
a intensidade do sinal piezoeléctrico das nanoestruturas diminui com o
aumento da temperatura e desaparece a 490 K (La mol. 8%) e 420 K (9,5%).
Os ciclos de histerese locais foram obtidos em função da temperatura. A
evolução dos parâmetros macroscópicos e locais com a temperatura de
superfície sugere um forte efeito de superfície nas transições de fase
ferroeléctricas do material investigado. A rugosidade da parede de domínio é
determinada por PFM para a estrutura de domínio natural existente neste
ferroeléctrico policristalino. Além disso, os domínios ferroeléctricos artificiais
foram criados pela aplicação de pulsos eléctricos à ponta do condutor PFM e o
tamanho de domínio in-plane foi medido em função da duração do pulso.
Todas estas experiências levaram à conclusão de que a parede de domínio
em relaxors do tipo PZT é quase uma interface unidimensional. O mecanismo
de contraste na superfície de relaxors do tipo PLZT é medido por PFMAs estruturas de domínio versus evolução da profundidade foram estudadas
em cristais PZN-4,5%PT, com diferentes orientações através da PFM. Padrões
de domínio irregulares com tamanhos típicos de 20-100 nm foram observados
nas superfícies com orientação das amostras unpoled?. Pelo contrário,
os cortes de cristal exibem domínios regulares de tamanho mícron
normal, com os limites do domínio orientados ao longo dos planos
cristalográficos permitidos. A existência de nanodomínios em cristais com
orientação está provisoriamente (wrong Word) atribuída à natureza
relaxor de PZN-PT, onde pequenos grupos polares podem formar-se em
coindições de zero-field-cooling (ZFC). Estes nanodomínios são considerados
como os núcleos do estado de polarização oposta e podem ser responsáveis
pelo menor campo coercitivo para este corte de cristal em particular. No
entanto, a histerese local piezoelétrica realizada pelo PFM à escala
nanométrica indica uma mudança de comportamento de PZN-PT semelhante
para ambas as orientações cristalográficas investigadas. A evolução das
estruturas de domínio com polimento abaixo da superfície do cristal foi
investigada. O domínio de ramificações e os efeitos de polarização de triagem
após o polimento e as medições de temperatura têm sido estudados pela PFM
e pela análise SEM. Além disso, verificou-se que a intensidade do sinal
piezoeléctrico a partir das estruturas de nanodomínio diminui com o aumento
da temperatura, acabando por desaparecer aos 430 K (orientaçáo ) e
470 K (orientação ). Esta diferença de temperatura nas transições de
fase local em cristais de diferentes orientações é explicada pelo forte efeito de
superfície na transição da fase ferroelétrica em relaxors.A comutação da polarização em relaxor ergódico e nas fases ferroeléctricas do
sistema PMN-PT foram realizadas pela combinação de três métodos,
Microscopia de Força Piezoeléctrica, medição de um único ponto de
relaxamento eletromecânico e por ultimo mapeamento de espectroscopia de
tensão. A dependência do comportamento do relaxamento na amplitude e
tempo da tensão de pulso foi encontrada para seguir um comportamento
logarítmico universal com uma inclinação quase constante. Este
comportamento é indicativo da progressiva população dos estados de
relaxamento lento, ao contrário de uma relaxação linear na presença de uma
ampla distribuição do tempo de relaxamento. O papel do comportamento de
relaxamento, da não-linearidade ferroeléctrica e da heterogeneidade espacial
do campo na ponta da sonda de AFM sobre o comportamento do ciclo de
histerese é analisada em detalhe. Os ciclos de histerese para ergódica PMN-
10%PT são mostrados como cineticamente limitados, enquanto que no PMN,
com maior teor de PT, são observados verdadeiros ciclos de histerese
ferroeléctrica com viés de baixa nucleação.In this thesis, Pb-based relaxor ferroelectrics of the (Pb,La)(Zr,Ti)O3 (PLZT),
Pb(Mg1/3,Nb2/3)O3-PbTiO3 (PMN-PT), Pb(Zn1/3,Nb2/3)O3-PbTiO3 (PZN-PT)
families were investigated and analyzed. Ferroelectric and dielectric properties
of the samples were studied by conventional macroscopic methods and locally
by piezoresponse force microscopy (PFM).
In PLZT 9.75/65/35 ceramics the nanoscale PFM contrast was investigated as
a function of grain size and grain orientation. It was found that the intensity of
piezoresponse signal from nanodomain structure decreases with temperature
and it disappears at 490 K (La mol. 8%) and 420 K (9.5%). Local hysteresis
loops were obtained as a function of temperature. The evolution of the
macroscopic and local parameters with temperature suggests strong surface
effect on ferroelectric phase transition in the investigated materials. The domain
wall roughness is determined with PFM for the natural domain structure
existing in this polycrystalline ferroelectric. Besides, artificial ferroelectric
domains were created by application of voltage pulses to the conducting PFM
tip, and the in-plane domain size was measured as a function of pulse duration.
All these experiments result in the conclusion that the domain wall in PZT-type
relaxors is quasi one-dimensional interface. The mechanism of the surface
contrast in PLZT-type relaxors is uncovered by PFM.
Domain structures vs. depth evolution was studied in PZN-4.5%PT crystals
with different orientation via PFM. Irregular domain patterns with the typical
sizes 20-100 nm were observed on the (001)-oriented surfaces of unpoled
samples. On the contrary, (111) crystal cuts exhibit normal micron-size regular
domains with the domain boundaries directed along allowed crystallographic
planes. The existence of nanodomains in (001)-oriented crystals is tentatively
attributed to the relaxor nature of PZN-PT where small polar clusters may form
under zero-field-cooling (ZFC) conditions. These nanodomains are considered
as the nuclei of the opposite polarization state and can be responsible for the
smaller coercive field for this particular crystal cut. However, local piezoelectric
hysteresis performed by PFM on the nanometer scale indicates similar
switching behavior of PZN-PT for both investigated crystallographic
orientations. Evolution of the domain structures with polishing below the crystal
surface has been investigated. The domain branching and polarization
screening effects after polishing and temperatures measurements have been
studied by PFM and SEM analysis. In addition, it was found what the intensity
of piezoresponse signal from nanodomain structures decreases with
temperature and finally disappears at 430 K ( orientation) and 470 K
( orientation). This difference of the temperature of local phase
transitions for crystals of different orientaions is explained by strong surface
effect on ferroelectric phase transition in relaxors.
Polarization switching in ergodic relaxor and ferroelectric phases in the PMNPT
system is studied using Piezoresponse Force Microscopy, single point
electromechanical relaxation measurements, and voltage spectroscopy
mapping. The dependence of relaxation behavior on voltage pulse amplitude
and time was found to follow a universal logarithmic behavior with a nearly
constant slope. This behavior is indicative of the progressive population of
slow relaxation states, as opposed to a linear relaxation in the presence of a
broad relaxation time distribution. The role of relaxation behavior,
ferroelectric non-linearity, and the spatial inhomogeneity of the tip field on
hysteresis loop behavior is analyzed in detail. The hysteresis loops for
ergodic PMN-10%PT are shown to be kinetically limited, while in PMN with
larger PT content, true ferroelectric hysteresis loops with low nucleation
biases are observed.FCT - SFRH/BD/22391/200
Doklady Physics V. 50, I. 04
No full textdc.description[en_US]Doklady Physics -- April 2005
Volume 50, Issue 4, pp. 165-226
PHYSICS
Electromagnetically Induced Transparency and Controlling the Time Shape of Laser Pulses
V. G. Arkhipkin and I. V. Timofeev
pp. 165-168 Full Text: PDF (51 kB)
Stochastic Simulation of the Fluctuation Stage in the Formation of Thin Films
A. L. Bondareva and G. I. Zmievskaya
pp. 169-173 Full Text: PDF (308 kB)
Effect of Relaxation-Time Distribution in the Dielectric Spectra of Semielectrics
N. V. Afanas'ev, L. V. Mukhaeva, A. A. Maksimov, T. G. Ermakova, and M. G. Voronkov
pp. 174-177 Full Text: PDF (105 kB)
Calculation of the Electromagnetic Fields of Dipole Sources in Layered Media
S. I. Smagin and V. N. Mazalov
pp. 178-183 Full Text: PDF (95 kB)
MECHANICS
On the Theory of Longitudinal and Transverse Vibrations of Preliminary Stressed Beams and Rods
Yu. A. Dem'yanov
pp. 184-187 Full Text: PDF (48 kB)
On the Effect of a Porous Insert in the Supersonic Section of a Nozzle upon Change in Its Thrust
V. N. Zaikovskii, V. P. Kiselev, S. P. Kiselev, B. M. Melamed, M. I. Sokolovskii, A. I. Todoshchenko, G. V. Trubacheev, and V. M. Fomin
pp. 188-191 Full Text: PDF (58 kB)
Families of Symmetric Periodic Motions of the Euler Problem
V. N. Tkhai
pp. 192-194 Full Text: PDF (48 kB)
Structure of a Diffusion-Induced Flow Near a Sphere in a Continuously Stratified Fluid
V. G. Baydulov, P. V. Matyushin, and Yu. D. Chashechkin
pp. 195-199 Full Text: PDF (3823 kB)
Initial Stage of the Generation of Dam-Break Waves
V. I. Bukreev and A. V. Gusev
pp. 200-203 Full Text: PDF (361 kB)
Acceleration Waves in Micropolar Elastic Media
V. A. Eremeyev
pp. 204-206 Full Text: PDF (47 kB)
Stationary Motion of a Homogeneous Meteor Ring in a Central Gravitational Field
G. V. Kasatkin
pp. 207-210 Full Text: PDF (49 kB)
Dynamic Model of a Porous Medium Saturated with a Viscous Liquid
S. V. Nesterov and L. D. Akulenko
pp. 211-214 Full Text: PDF (50 kB)
Microstructure Sources of Sound Backscattering in a Stratified Flow
V. E. Prokhorov
pp. 215-219 Full Text: PDF (399 kB)
On the Theory of Roll Waves in Inclined Channels
E. A. Demekhin, E. N. Kalaidin, and E. M. Shapar'
pp. 220-222 Full Text: PDF (50 kB)
On Evolutional and Catastrophic Regimes of Meso���Macro Energy Exchange in Dynamically Loaded Media
Yu. I. Mescheryakov
pp. 223-226 Full Text: PDF (54 kB)dc.description.contributor[en_US]dc.description.contributor[en_US
Doklady Physics V. 50, I. 04
No full textDoklady Physics -- April 2005
Volume 50, Issue 4, pp. 165-226
PHYSICS
Electromagnetically Induced Transparency and Controlling the Time Shape of Laser Pulses
V. G. Arkhipkin and I. V. Timofeev
pp. 165-168 Full Text: PDF (51 kB)
Stochastic Simulation of the Fluctuation Stage in the Formation of Thin Films
A. L. Bondareva and G. I. Zmievskaya
pp. 169-173 Full Text: PDF (308 kB)
Effect of Relaxation-Time Distribution in the Dielectric Spectra of Semielectrics
N. V. Afanas'ev, L. V. Mukhaeva, A. A. Maksimov, T. G. Ermakova, and M. G. Voronkov
pp. 174-177 Full Text: PDF (105 kB)
Calculation of the Electromagnetic Fields of Dipole Sources in Layered Media
S. I. Smagin and V. N. Mazalov
pp. 178-183 Full Text: PDF (95 kB)
MECHANICS
On the Theory of Longitudinal and Transverse Vibrations of Preliminary Stressed Beams and Rods
Yu. A. Dem'yanov
pp. 184-187 Full Text: PDF (48 kB)
On the Effect of a Porous Insert in the Supersonic Section of a Nozzle upon Change in Its Thrust
V. N. Zaikovskii, V. P. Kiselev, S. P. Kiselev, B. M. Melamed, M. I. Sokolovskii, A. I. Todoshchenko, G. V. Trubacheev, and V. M. Fomin
pp. 188-191 Full Text: PDF (58 kB)
Families of Symmetric Periodic Motions of the Euler Problem
V. N. Tkhai
pp. 192-194 Full Text: PDF (48 kB)
Structure of a Diffusion-Induced Flow Near a Sphere in a Continuously Stratified Fluid
V. G. Baydulov, P. V. Matyushin, and Yu. D. Chashechkin
pp. 195-199 Full Text: PDF (3823 kB)
Initial Stage of the Generation of Dam-Break Waves
V. I. Bukreev and A. V. Gusev
pp. 200-203 Full Text: PDF (361 kB)
Acceleration Waves in Micropolar Elastic Media
V. A. Eremeyev
pp. 204-206 Full Text: PDF (47 kB)
Stationary Motion of a Homogeneous Meteor Ring in a Central Gravitational Field
G. V. Kasatkin
pp. 207-210 Full Text: PDF (49 kB)
Dynamic Model of a Porous Medium Saturated with a Viscous Liquid
S. V. Nesterov and L. D. Akulenko
pp. 211-214 Full Text: PDF (50 kB)
Microstructure Sources of Sound Backscattering in a Stratified Flow
V. E. Prokhorov
pp. 215-219 Full Text: PDF (399 kB)
On the Theory of Roll Waves in Inclined Channels
E. A. Demekhin, E. N. Kalaidin, and E. M. Shapar'
pp. 220-222 Full Text: PDF (50 kB)
On Evolutional and Catastrophic Regimes of Meso–Macro Energy Exchange in Dynamically Loaded Media
Yu. I. Mescheryakov
pp. 223-226 Full Text: PDF (54 kB)Archived web conten
On Singularity Formation of Monotone Flows
No full textThe well-posedness problem of Euler equations is one of the most intriguing yet difficult mathematical problems in fluids. The global existence of classical solutions of 2D Euler equations has been solved by H older, Wolibner and the global existence of weak solutions by Yudovich. Yet in 3D, due to of quadratic non-linearity and non-locality, the global well-posedness of Euler's equations remains unclear still. In 2013, Hou-Luo investigated 3D Euler's equations under the axisymmetric assumptions and observed numerical blow up on a ring of hyperbolic points on the boundary of the fluid domain. Their numerical simulation has shed important light on studying the evolution of vorticity of Euler equations. In this thesis, we propose and discuss a few models of 3D Euler equations. In particular, with the modi cations to the original models, we are able to gain uniform control in the direction of the flows for the modi ed models, which will then create a mathematical rigorous scenario reminiscent of Hou-Luo's numerical work. In these models, we show that solutions blow up in finite time for a wide range of initial data.
The content of Chapter 2 includes a joint work with V. Hoang, M. Radosz and B. Orcan and content of Chapter 3 is a joint work with A. Kiselev. Both of these works are published and can be found in [1] and [2]. The content of Chapter 4 is being revised for publication
Leidynema bestium Spiridonov & Kiselev 2022, sp. n.
No full textLeidynema bestium sp. n. (Figs. 1 – 3; Tables 1 – 2) Female. Cephalic capsule well defined, 22 – 23 µm long and 51–53 µm in diameter with anteriorly protruding circumoral disk of 25 µm in diameter (Fig. 1B; 2A). First five rings of cuticle narrow, 12 – 14 to 20 µm wide with diameter increasing from 50 – 52 µm up to 75 µm (Fig. 2A). Cuticular rings posterior to first five ones much wider (25 µm and more) and keeping this more or less uniform width throughout the body. Stomatal opening round, encircled with eight trapezoidal pseudolabia (Fig. 2A – C). Circumoral disk of eight pseudolabia separated from remaining surface of anterior end with a deep seam. Cuticle on both sides of this seam groove with wrinkled surface (Fig. 2B). Amphidial opening on separate plate 1 x 0.6 µm in size, wedged between pseudolabia (Fig. 2B – C). Buccal cavity thin-walled at anterior (cheilostom), containing strongly cuticularised tubular part at level of cephalic capsule (Fig. 1B). Additional cuticularised structures at bottom of buccal cavity embedded into pharyngeal tissue (stegostom). Lateral alae 13–18 µm wide, starting from bulb level and terminating before anus level without sharpened spikes (Fig. 2F). Three elongated structures 4 x 1.5 µm in size situated at anterior of pharyngeal lumen (Fig. 1B). Anterior half of pharyngeal corpus narrower (26 – 27 µm) than its basal part (57 – 58 µm). Nerve ring situated at border between narrow and wider parts of pharynx, 157 – 168 µm from anterior. Basal bulb and isthmus separated from corpus by thick basal membrane (Fig. 1C). Bulb containing valves and separate from valvular cuticularised structures: triangular plates posterior to valves and round structures closer to cardia. Excretory pore located in 310 – 580 µm from anterior. Cuticularised excretory duct leading from pore to excretory vesicle (Fig. 1D). Four wide thin-walled excretory channels running into lateral chords (X-shaped excretory system). Intestine composed of numerous hexagonal-polygonal cells. Proventriculus wide with thick walls. Voluminous caecum starting from proventriculus and ending 150 – 230 µm from anterior border of muscular vagina. Didelphic amphidelphic reproductive system. Two uteri run in opposite direction from proximal end of vagina. Anterior uterus then turns back into posterior body part, with majority of eggs situated posterior to vulva. Egg-shell length 115 μm (112–119 μm), width 45 μm (41–47 μm). Muscular vagina about 120 – 180 µm long directed anteriorly from vulvar opening. Vulva equatorial (V% = 49–51). Posterior body tightly filled with gonadal tubes. Anterior ovary tip cell situated usually at level of intestinal caecum and posterior ovary tip cell midway between vulva and anus. Anal diameter four times less as mid-body diameter. Tail filament comparatively short, dagger-like (Fig. 1A, 2D). Female juvenile of fourth stage. Cuticle on ventral and dorsal sides of the body covered with regularly distributed bulges (Fig. 2E) with approx. size (length x width) 5 – 10 x 4 – 9 µm. Male. Body slender, with ventrally bent posterior end (Fig. 1G, 3C). Circumoral plate 10 µm wide. Cephalic capsule swollen, 15 µm in diameter. Body narrowing just posterior to capsule (11 – 12 µm in diameter). Fifteen anterior cuticular rings prominent, with longitudinal ridges (striation) increasing in length from 2 – 3 µm to 7 – 8 µm (Fig. 3A). Lateral alae starting at level of fifteenth ring or mid-corpus level (body diameter at this level about 30 µm) and terminating near rectum. Buccal cavity tubular with transparent walls and single short mid-length thickening of cuticular lining (Fig. 1H). Three refractive thickenings on stoma-pharynx junction. Nerve ring at posterior of corpus. Isthmus transparent, swollen at border with corpus bulb (Fig. 1H). Bulb containing three distinct valves with very thin cuticular folds. Excretory pore visible in some specimens at bulb level. Intestine anterior with wide lumen. Testis reflexing at mid-body (Fig. 1G). Posterior half of gonadal tube with transparent walls. A portion of gonadal tube before cloaca with vacuolated walls (vas deferens). Single rod-like spicule with slightly curved tip and thickened head. Four pairs of copulatory papillae: a pair of protruding subventral ones before cloacal opening (Fig. 3C – F); two pairs of subventral postcloacal papillae of different size: a pair of larger-sized situated at midtail on cuticle protrusion, and a pair of smallest ones close to tail mucron (Fig. 3D – F) and a subdorsal pair of papillae intermediate in size. Precloacal and subdorsal papillae of typical thelastomatid structure with central round protrusion and nine smaller tubercles around (Fig. 3D – G). Well defined mid-ventral opening of unknown function behind the cloaca. Deep lateral surface pit at mid-tail distinguished under SEM only (maybe due to an artefact of drying). Tail mucron 3 – 5 µm long, rod-like (Fig. 3F). Type host. Diploptera punctata (Eschscholtz, 1922). Another host. Elliptorhina chopardi (Lefeuvre, 1966) Etymology. The specific name of the new species reflects its finding in cultured cockroaches from a zoo (bestiarium). Localization. Hind gut lumen (colon). Type specimens. Holotype male on the slide accession number 1333 (IPEE RAS parasites) and paratypes (five males on slides 14301 a–e and five females on slides 14300 a–e) are deposited in the Museum of the Helminthological Collections of the Centre of Parasitology, A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences. The voucher specimens, two females of L. bestium obtained from the dissections of Elliptorhina chopardi, are stored at the same collection (slides 14302 a–b). Bionomics. Intensity of the infection with Leidynema bestium of the Diploptera punctata: 1– 3 females and 1– 2 males per host. Molecular phylogenetic analysis. The LSU rDNA sequences of specimens obtained from both hosts were compared and found to be completely identical (Table 2). The final dataset of the obtained alignment for new and related species contained 650 positions. The LSU rDNA sequence of the new species has demonstrated the 42 bp difference with L.portentosae Van Waerebeke, 1978 and 68–70 bp difference with the type species L. appendiculatum. The nucleotide difference between L. appendiculatum and L. portentosae was 63 – 64 bp. Remarkably, the nucleotide sequences of L. appendiculatum were splitting onto two clades (Fig. 4), designated conditionally as clade A and clade B. The sequences of the clade A were obtained from Leidynema nematodes parasitizing in different cockroach genera (Blaberus Serville, 1831, Blatta Linnaeus, 1758, Periplaneta Burmeister, 1838, Shelfordella Adelung, 1910. The sequences of clade B were obtained from L. appendiculatum nematodes originating nearly exclusively from Periplaneta cockroaches with only sequence deposited under KY057029 originating from nematode parasitizing Pycnoscelus surinamensis (Linnaeus, 1758). The nucleotide difference between these two clades was in 10 bp. The distances between of L. bestium sp. n. and species of other thelastomatid genera associated with cockroaches were more remarkable accounting for 109 bp of Buzionema validum Kloss, 1966, 112 bp of Severianoia blapticola Guzeyeva, 2009, 121 bp of Cranifera cranifera (Chitwood, 1932), 138 bp of Aoruroides chubadaigaku Morffe, García, Hasegawa & Carreno, 2019 and 167 bp of Hammerschmidtiella keeneyi Carreno, 2017. Differential diagnosis. Morphology of L. bestium sp. n. demonstrates several features to distinguish it from the previously described species (Singh et al. 2014). The new species is characterised by the presence of lateral alae in both sexes with posterior margin of alae before the anal opening level, absence of a spike-like posterior termination of lateral alae in females, longitudinal striation of the anteriormost annuli in males; four pairs of male genital papillae, and the equatorial position of vulva. The lateral alae are present both in males and females of L. bestium sp. n. In this aspect the new species is similar to L. appendiculatum, L. delatorrei Chitwood, 1932; L. periplaneti Farooqui, 1967; L. orientalis Singh & Malti, 2004; L. saltense (Achinelly & Camino, 2008) and L. meerutensis Singh, Rastogi & Singh, 2014. Leidynema bestium sp. n. is closest to L. delatorrei in the presence of longitudinal striation of the first 15 annuli at the male anterior end (Leibersperger, 1960) and in the structure of a female tail filament (quite short, dagger-like), but differs in the total number of genital papillae in males (five in L. delatorrei vs four in L. bestium sp. n.). Lateral alae in L. delatorrei males end at cloaca level vs in 20 µm anterior to cloaca in L. bestium sp. n. The new species also differs from L. delatorrei in having the longer average male body (above 900 µm vs 680 µm in L. delatorrei). According to Singh et al. (2014), the vulva in L. delatorrei is displaced to anterior part of the body (V% = 41 – 43) while in the new species vulva is located in mid-body. The new species can be distinguished from the type species L. appendiculatum by the presence of longitudinal striations of annuli at the male anterior end, presence of four vs five genital papillae and the wider and shorter female tail filament.All remaining species of Leidynema, both sexes of which possess lateral alae can be distinguished from L. bestium sp. n. by the following unique features (Singh et al. 2014): five pairs of papillae in L. periplaneti and L. orientalis, anteriorly displaced excretory pore in L. saltense and asymmetrically disposed female ala posterior ends (spikes) in L. meerutensis. Thus, L. orientalis differs from the present species by the posterior position of vulva. L. saltense unlike L. bestium sp. n. n has more anterior position of the excretory pore. Leidynema meerutensis can be differentiated from L. bestium sp. n. in the presence of a terminal spike, i.e. pointed posterior end of female lateral alae vs not pointed.Published as part of Spiridonov, Sergei E. & Kiselev, Sergei M., 2022, Leidynema bestium sp. n. (Oxyuridomorpha: Thelastomatidae) an intestinal parasite of blaberid cockroaches from Yaroslavl Zoo, Russia, pp. 271-280 in Zootaxa 5200 (3) on pages 272-276, DOI: 10.11646/zootaxa.5200.3.5, http://zenodo.org/record/726053
Astronomy Letters, V. 29, I. 01
No full textAstronomy Letters -- January 2003
Volume 29, Issue 1, pp. 1-63
New Properties of Scalar-Field Dynamics in an Isotropic Cosmological Model on the Brane
A. V. Toporensky, P. V. Tret'yakov, and V. O. Ustiansky
pp. 1-5 Full Text: PDF (163 kB)
Observational Manifestations of Prerecombination Protoobjects
V. K. Dubrovich
pp. 6-9 Full Text: PDF (118 kB)
Effects of Boundary Conditions and Viscous Energy Dissipation on Carbon Burning in Thermonuclear Supernova Models
N. V. Dunina-Barkovskaya and V. S. Imshennik
pp. 10-19 Full Text: PDF (310 kB)
Possibilities for Detecting Extinct Radio Pulsars
V. S. Beskin and S. A. Yeliseyeva
pp. 20-25 Full Text: PDF (181 kB)
Triplet Structure of the H2O Spectra in S255
M. I. Pashchenko, E. E. Lekht, and A. M. Tolmachev
pp. 26-30 Full Text: PDF (215 kB)
Spectroscopic and Photometric Studies of the Magnetic Cataclysmic Variable EU UMa (=RE1149+28)
T. A. Somova, N. N. Somov, J. M. Bonnet-Bidaud, and M. Mouchet
pp. 31-36 Full Text: PDF (223 kB)
Determining the Minimum Sum of the Component Masses for a Binary with a Known Parallax from Observations of a Short Arc of Its Apparent Motion
A. A. Kiselev and O. V. Kiyaeva
pp. 37-40 Full Text: PDF (130 kB)
Dynamics of Rotating Triple Systems
M. J. Valtonen, A. A. Mülläri, V. V. Orlov, and A. V. Rubinov
pp. 41-49 Full Text: PDF (193 kB)
Natural Superrotation of a Rarefied Planetary Atmosphere
P. A. Bespalov and O. N. Savina
pp. 50-57 Full Text: PDF (205 kB)
A Model for the Tail Region of the Heliospheric Interface
V. V. Izmodenov and D. B. Alexashov
pp. 58-63 Full Text: PDF (217 kB)Archived web conten
Astronomy Letters, V. 27, I. 06
No full textAstronomy Letters -- June 2001
Volume 27, Issue 6, pp. 345-409
The Ursa Major Supercluster of Galaxies: II. The Structure and Peculiar Velocities
F. G. Kopylova and A. I. Kopylov
pp. 345-352 Full Text: PDF (120 kB)
Type Ia Supernovae: An Explosion in the Regime of a Convergent Delayed Detonation Wave
N. V. Dunina-Barkovskaya, V. S. Imshennik, and S. I. Blinnikov
pp. 353-362 Full Text: PDF (200 kB)
Low State of the X-ray Burster SLX 1732-304 in the Globular Cluster Terzan 1 According to RXTE Data
S. V. Molkov, S. A. Grebenev, and A. A. Lutovinov
pp. 363-365 Full Text: PDF (60 kB)
Relativistic Gravitational Collapse of a Cool White Dwarf with Allowance for the Neutronization Kinetics
A. I. Voropinov and M. A. Podurets
pp. 366-375 Full Text: PDF (113 kB)
Detection of Optical Circular Polarization in the Herbig Ae Star WW Vul
D. N. Shakhovskoi, O. S. Shulov, and E. N. Kopatskaya
pp. 376-378 Full Text: PDF (45 kB)
Close Binary Systems in Star-Forming Regions: EQ Ori in the Ori I Association
M. M. Zakirov
pp. 379-385 Full Text: PDF (107 kB)
Hipparcos Trigonometric Parallaxes and the Distance Scale for Open Star Clusters
A. V. Loktin and G. V. Beshenov
pp. 386-390 Full Text: PDF (59 kB)
An Astrometric Study of the Triple Star ADS 48
O. V. Kiyaeva, A. A. Kiselev, E. V. Polyakov, and V. B. Rafal'skii
pp. 391-397 Full Text: PDF (98 kB)
Preliminary Results of the Alignment and Hartmann Tests of the AZT-22 Telescope
Z. Aslan, I. F. Bikmaev, É. A. Vitrichenko, R. I. Gumerov, L. A. Dembo, S. F. Kamus, V. Keskin, U. Kiziloglu, M. N. Pavlinsky, L. N. Panteleev, N. A. Sakhibullin, S. O. Selam, R. A. Sunyaev, I. Khamitov, and A. L. Yaskovich
pp. 398-403 Full Text: PDF (120 kB)
Orbital Evolution of Uranus's New Outer Satellites
M. A. Vashkov'yak
pp. 404-409 Full Text: PDF (159 kB)Archived web conten
Crystal morphology and surface reactivity studies of calcium hydroxide
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Calcium hydroxide samples, obtained as a precipitate from the mixing of solutions of sodium hydroxide with a variety of calcium salts in the optional presence of ethanol and a silylating agent, have been characterised by the techniques of nitrogen adsorption, water vapour adsorption , thermogravimetric analysis, Fourier-transform infra-red spectroscopy, ultra-violet spectroscopy and electron microscopy. The morphology of the samples varied from octahedral crystals to hexagonal prisms to sheets. The individual morphology depends on the conditions of precipitation, the nature and concentration of the calcium salt(s) and the nature of the precipitation medium. It has been shown that a large excess of sodium hydroxide results in octahedral forms, calcium salt(s) in approximate equimolar amount or in large excess to the sodium hydroxide results in hexagonal forms, and sheets are formed in the presence of ethanolic precipitation medium. A poisoning mechanism has been suggested in terms of the morphological properties of the samples. It has been found that the sheet forms of calcium hydroxide can be stabilised by reaction with a silylating agent, resulting in greater thermal stability and chemical stability of the surface. Silylation was found not to occur by direct contact between the precipitated calcium hydroxide samples and silylating agents. Silylation only occurred when precipitation was carried out in the presence of a solution of the silylating agent in absolute ethanol. The silylation of the surface of calcium hydroxide has been found to stabilise the material. Reaction of this with 3-aminopropyltriethoxysilane formed an intermediate which subsequently reacted with p-nitrobenzoyl chloride to form an inorganic - organic composite. The technique of thermogravimetric analysis has been employed to measure the thermal stability of the samples. It has been found that the samples exhibit major weight losses at around 688K for the non-silylated samples and around 918K for the silylated samples. The BETnitrogen and the BET-H20 surface areas of the samples range typically from --1 to 43 m2g-1 , and from 9 to 798 m2g-1 respectively. On the basis of this evidence, taken together with the isotherm shapes it has been shown that: the samples are non-porous; non-silylated calcium hydroxide samples are more hydrophobic than the silylated samples, but upon heat-treatment in air below the decomposition temperature the silylated samples became more hydrophobic, whereas the non-silylated samples became more hydrophilic; samples heated in air at above the decomposition temperature exhibit a dramatic increase in hydrophilicity, the H 20-BET surface areas becoming —800 m2g-1 for non silylated samples, compared to 368 - 600 m 2g-1 for silylated samples, indicative of chemisorption following decomposition of the calcium hydroxide to form calcium oxide
JETP Letters V. 71, I .06
No full textJETP Letters -- March 25, 2000
Volume 71, Issue 6, pp. 217-272
FIELDS, PARTICLES, NUCLEI
Gell-Mann–Low Function in the phi4 Theory
I. M. Suslov
pp. 217-221 Full Text: PDF (65 kB)
Nonforward Color Octet BFKL Kernel
V. S. Fadin and D. A. Gorbachev
pp. 222-226 Full Text: PDF (73 kB)
Compton Tensor with Heavy Photon for Longitudinally Polarized Electron with Next-to-Leading Accuracy
G. I. Gakh, M. I. Konchatnij, and N. P. Merenkov
pp. 227-230 Full Text: PDF (54 kB)
P-Vortices, Nexuses, and Effects of Gauge Copies
V. G. Bornyakov, D. A. Komarov, M. I. Polikarpov, and A. I. Veselov
pp. 231-234 Full Text: PDF (55 kB)
Eigenfunctions of GL(N, [openface R]) Toda Chain: Mellin–Barnes Representation
S. Kharchev and D. Lebedev
pp. 235-238 Full Text: PDF (59 kB)
Low-Energy Theorems and the Dirac Operator Spectral Density in QCD
A. Gorsky
pp. 239-241 Full Text: PDF (34 kB)
ATOMS, SPECTRA, RADIATIONS
Exciton Luminescence of Quasi-Two-Dimensional Solid Solutions
A. Klochikhin, A. Reznitskii, L. Tenishev, S. Permogorov, S. Ivanov, S. Sorokin, Kh. Mumanis, R. Seisyan, and C. Klingshirn
pp. 242-245 Full Text: PDF (67 kB)
Hard X Radiation and Fast Particles in Laser Plasma Experiments at Laser Intensities of up to 5 × 1018 W/cm2 on the Target Surface
V. G. Borodin, O. N. Gilev, A. L. Zapysov, V. M. Komarov, V. A. Lykov, V. A. Malinov, V. M. Migel', N. V. Nikitin, V. G. Pokrovskii, V. A. Pronin, V. N. Saprykin, A. V. Charukhchev, and V. N. Chernov
pp. 246-249 Full Text: PDF (53 kB)
CONDENSED MATTER
Spin-Glass Transition in a Kondo Lattice with Quenched Disorder
M. N. Kiselev and R. Oppermann
pp. 250-254 Full Text: PDF (69 kB)
Electrostatic Potential, Energy Spectrum, and Fano Resonances in a Ballistic Ring Interferometer Based on an AlGaAs/GaAs Heterojunction
O. A. Tkachenko, V. A. Tkachenko, D. G. Baksheev, Z. D. Kvon, and J. C. Portal
pp. 255-258 Full Text: PDF (81 kB)
Dispersion Relation for Kink-Type Solitons in One-Dimensional Ferromagnets
E. G. Galkina and B. A. Ivanov
pp. 259-261 Full Text: PDF (43 kB)
Deformation and Instability of Nematic Drops in an External Electric Field
B. I. Lev, V. G. Nazarenko, A. B. Nych, and P. M. Tomchuk
pp. 262-265 Full Text: PDF (95 kB)
Trapped Bose Condensate in a Gravitational Field
D. B. Baranov and V. S. Yarunin
pp. 266-270 Full Text: PDF (68 kB)
Conductivity of a "Colored" Plane
V. G. Marikhin
pp. 271-272 Full Text: PDF (27 kB)Archived web conten
- …
