Immanuel Kant Baltic Federal University

www.kantiana.ru
Kaliningrad, Russia

Immanuel Kant Baltic Federal University formerly known as the Immanuel Kant Russian State University , or in brief the Kant University and as Kaliningrad State University , is a university in the Russian city of Kaliningrad .The university claims to maintain the traditions of its German predecessor, the German University of Königsberg . Wikipedia.

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Astashenok A.V.,Immanuel Kant Baltic Federal University | Capozziello S.,University of Naples Federico II | Capozziello S.,Compl University Of Monte gelo | Capozziello S.,National Institute of Nuclear Physics, Italy | And 2 more authors.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

Quark star models with realistic equation of state in nonperturbative f(R) gravity are considered. The mass-radius relation for f(R)=R+αR2 model is obtained. Considering scalar curvature R as an independent function, one can find out, for each value of central density, the unique value of central curvature for which one has solutions with the required asymptotic R→0 for r→∞. In other words, one needs a fine-tuning for R to achieve quark stars in f(R) gravity. We consider also the analogue description in corresponding scalar-tensor gravity. The fine-tuning on R is equivalent to the fine-tuning on the scalar field ϕ in this description. For distant observers, the gravitational mass of the star increases with increasing α (α>0) but the interpretation of this fact depends on frame where we work. Considering directly f(R) gravity, one can say that increasing of mass occurs by the "gravitational sphere" outside the star with some "effective mass". On the other hand, in conformal scalar-tensor theory, we also have a dilaton sphere (or "disphere") outside the star but its contribution to gravitational mass for distant observer is negligible. We show that it is possible to discriminate modified theories of gravity from General Relativity due to the gravitational redshift of the thermal spectrum emerging from the surface of the star. © 2015 The Authors.


Gavrilov N.M.,Saint Peterburg State University | Kshevetskii S.P.,Immanuel Kant Baltic Federal University
Advances in Space Research | Year: 2015

We performed numerical simulations of nonlinear AGW propagation to the middle and upper atmosphere from a plane wave forcing at the Earth's surface with period τ = 2 × 103 s. After activating the surface wave forcing, initial pulse of acoustic and very long gravity modes in a few minutes can reach altitudes above 100 km. Dissipation of this initial pulse produces substantial mean heating and wave-induced mean winds at altitudes above 200 km. This may influence AGW propagation and produce enhanced vertical gradients of temperature, horizontal velocity and increased wave dissipation in the lower part of the wave-induced mean flows helping their downward expansions. Later, AGWs may produce layers of convective instability and peaks of the wave-induced jets at altitudes 100-120 km. Shorter AGWs with smaller horizontal wave speeds produce smaller mean heating and wave-induced mean velocities in the upper atmosphere at fixed amplitudes and periods of the surface wave excitation. Numerical simulation of nonlinear AGW propagation helps better understanding the details of dynamical and thermal influence of waves coming from the troposphere on the mean temperature and wind in the middle and upper atmosphere. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.


Astashenok A.V.,Immanuel Kant Baltic Federal University | Odintsov S.D.,Catalan Institution for Research and Advanced Studies | Odintsov S.D.,Institute Of Ciencies Of Lespai Csic Ieec | Odintsov S.D.,Eurasian University | Odintsov S.D.,Tomsk State Pedagogical University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

We confront dark energy models which are currently similar to ΛCDM theory with observational data which include the SNe data, matter density perturbations and baryon acoustic oscillations data. DE cosmology under consideration may evolve to Big Rip, type II or type III future singularity, or to Little Rip or Pseudo-Rip universe. It is shown that matter perturbations data define more precisely the possible deviation from ΛCDM model than consideration of SNe data only. The combined data analysis proves that DE models under consideration are as consistent as ΛCDM model. We demonstrate that growth of matter density perturbations may occur at sufficiently small background density but still before the possible disintegration of bound objects (like clusters of galaxies, galaxies, etc.) in Big Rip, type III singularity, Little Rip or Pseudo-Rip universe. This new effect may bring the future universe to chaotic state well before disintegration or Rip. © 2012.


Astashenok A.V.,Immanuel Kant Baltic Federal University | Nojiri S.,Nagoya University | Odintsov S.D.,Nagoya University | Odintsov S.D.,Catalan Institution for Research and Advanced Studies | And 2 more authors.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

We construct phantom energy models with the equation of state parameter w which is less than -1, w<-1, but finite-time future singularity does not occur. Such models can be divided into two classes: (i) energy density increases with time ("phantom energy" without "Big Rip" singularity) and (ii) energy density tends to constant value with time ("cosmological constant" with asymptotically de Sitter evolution). The disintegration of bound structure is confirmed in Little Rip cosmology. Surprisingly, we find that such disintegration (on example of Sun-Earth system) may occur even in asymptotically de Sitter phantom universe consistent with observational data. We also demonstrate that non-singular phantom models admit wormhole solutions as well as possibility of Big Trip via wormholes. © 2012 Elsevier B.V.


Lavrova A.I.,Immanuel Kant Baltic Federal University | Vanag V.K.,Immanuel Kant Baltic Federal University
Physical Chemistry Chemical Physics | Year: 2014

Two non-identical, frequency-different pulse-coupled oscillators with time delay have been systematically studied using four-variable model of the Belousov-Zhabotinsky (BZ) reaction at mutual inhibitory, mutual excitatory, and mixed excitatory-inhibitory types of coupling. Different resonances like 1 : 2, 2 : 3, 1 : 3, etc., as well as complex rhythms and abrupt changes between them occur depending on the coupling strengths, time delay, and frequency ratio. Analogously to in-phase and anti-phase oscillations for 1 : 1 resonance, a similar phase locking exists for 1 : 2 resonance in the case of inhibitory coupling. For excitatory coupling, a bursting regime is found. The number of spikes in a single burst can be tuned by both the frequency ratio and time delay. For excitatory-inhibitory coupling, a region where one oscillator is suppressed (OS zone) has been found. Boundary of the OS zone depends on the frequency ratio. For weakly coupled oscillators, Farey sequence has been found for excitatory-inhibitory and mutual excitatory coupling. © 2014 the Partner Organisations.


Zaytsev A.,Immanuel Kant Baltic Federal University
Finite Fields and their Applications | Year: 2016

We investigate maximal and minimal curves of genus 4 and 5 over finite fields with discriminant -11 and -19. As a result the Hasse-Weil-Serre bound is improved. © 2015 Elsevier Inc. All rights reserved.


Mikhaylov A.S.,Immanuel Kant Baltic Federal University
European Journal of Scientific Research | Year: 2014

Mikhaylova A. A. Immanuel Kant Baltic Federal University, A. Nevskogo str.14, Kaliningrad, 236041, Kaliningrad region, Russia This article reveals the spatial and sectoral distribution of international clusters in the Baltic macro-region. The research results suggest that there are 28 international clusters in the Baltic region, all of which have an organized structure and are supported by the state. An overwhelming majority of identified clusters represent cross-border type. The most prosperous cross-border regions in this regard are Oresund, Jutland, Bothnian Arc and Oslo - Vaster Gotland (or the GO region). Nearly half of the international clusters studied represent knowledge intensive sectors of economy and almost all are associated with the introduction of innovative solutions. A quarter of all international clusters of the macro-region are engaged in the life science sector, which could be a competitive niche of the Baltic region on the global scale. © European Journals Inc 2014.


Seledtsov V.I.,Immanuel Kant Baltic Federal University | Seledtsova G.V.,Institute of Clinical Immunology
Immunobiology | Year: 2012

The immune system has been shown to be involved in not only the host defense against infectious pathogens but also in tissue repair processes continuously occurring in the body. Our review presents the hypothesis about the mechanism of TLR-mediated regulation of adaptive immune responses linked to the tissue destruction. In our opinion following injury to a tissue, the expression of tissue-specific determinant/MHC class II complexes on dendritic cells and macrophages are upregulated significantly due to the increased uptake of tissue debris. Consequently, T-cells become activated as a result of low affinity, but high avidity interactions between self-reactive CD4. +. T cells and antigen-presenting cells (APCs). The type of self antigen-induced immune responses depends on the multiple downstream signals generated by intracellular toll-like receptors (TLRs) 3, 7, 8, and 9, that discriminate " self" and " non-self" nucleic acids. Accumulating data suggest that ligation of intracellular TLRs by endogenous DNA/RNA released from necrotic cells may result in developing Th2-like responses, as well as in the alternative activation of macrophages (M2), that favor local tissue protection and compensatory cell growth. In contrast, ligation of intracellular TLRs by exogenous pathogen-derived DNA/RNA may promote Th1-driven responses, as well as classical activation of macrophages (M1), that contribute to local tissue destruction and suppress cell growth. We suggest here that the balance between the host- and pathogen-derived nucleic acids interacting with intracellular TLRs contributes to the balance between immune-mediated tissue-protective and tissue-destructive events occurring in the body. © 2011 Elsevier GmbH.


Astashenok A.V.,Immanuel Kant Baltic Federal University
Astrophysics and Space Science | Year: 2014

Various cosmological models in frames of F(T) gravity are considered. The general scheme of constructing effective dark energy models with various evolution is presented. It is showed that these models in principle are compatible with ΛCDM model. The dynamics of universe governed by F(T) gravity can mimics ΛCDM evolution in past but declines from it in a future. We also construct some dark energy models with the "real" (non-effective) equation-of-state parameter w such that w≤-1. It is showed that in F(T) gravity the Universe filled phantom field not necessarily ends its existence in singularity. There are two possible mechanisms permitting the final singularity. Firstly due to the nonlinear dependence between energy density and H 2 (H is the Hubble parameter) the universe can expands not so fast as in the general relativity and in fact Little Rip regime take place instead Big Rip. We also considered the models with possible bounce in future. In these models the universe expansion can mimics the dynamics with future singularity but due to bounce in future universe begin contracts. © 2014 Springer Science+Business Media Dordrecht.


News Article | September 28, 2015
Site: www.techtimes.com

Russian scientists and engineers from the Kaliningrad-based Immanuel Kant Baltic Federal University has showed off a new cockroach-sized robot that touts to save lives... and spy on people. The members of the team that built this micro-robot revealed that their project has actually caught the interest of the Russian military. In fact, they said they will present a sample of the cockroach-like robot which comes with camouflage colors. The tiny 'bot measures four inches and boasts a speed of up to 12 inches per second. It houses contact and non-contact probes as well as light sensors, allowing it to move without bumping into obstacles. Presently, the prototype can work autonomously for 20 minutes. However, the team is planning to stretch the time. It will also be equipped with a navigation system, allowing users to program the 'bot's route. It is interesting to note that the robot can carry a weight of 10 grams, enough to load up a mini portable camera. The robot, according to its makers, can help during emergency services, particularly in assisting in rescue missions and penetrating hard-to-reach areas. The development of the 'bot started from observing the movements of real cockroaches to ensure its movement are as organic as possible. Specifically, the experts used a specimen of the Blaberus Craniifer as model for the development of the robot. The experts revealed they have created the mini robot for a private company. They did not go into detail, though, which company they have been working with. The company wanted the robot to look like a real cockroach, act like one, and be the right size, the team said. “Probably that was the most difficult part - to find balance between those three requirements,” said Aleksey Belousov, the head engineer of the project. “We had to develop many things from scratch," said Danil Borchevkin, the leading engineer of the university. "For example there’s a company in Austria that produces gearing for legs, but a unit for one robot would have cost us near US$9,000 while our whole budget is US$22,500." A similar project was developed by experts at North Carolina State University. They created cockroaches equipped with microphones and electronic backpacks, allowing the user to control the movement of the insects and to help locate humans during emergencies.

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