Yuriy Mishchenko: Publication List

[1] Mishchenko Y., Kaya M., Ozbay E., Yanar H. (2017) "Developing a 3- to 6-state EEG-based brain-computer interface for a robotic manipulator control.", BioRxiv 171025; doi: 10.1101/171025, details, full text.
The paper describes development of an electroencephalography (EEG) based noninvasive BCI system that can be used for a robotic manipulator control and detecting user's mental intent based on motor-imagery BCI paradigm. Experiments involving 12 healthy participants and analyzed offline as well as online are described. The EEG BCI system is shown to correctly identify different motor imageries in EEG data with good accuracy. 3 participants are shown to achieve BCI control accuracy in offline experiments of 80-90%. 2 participants did not achieve satisfactory accuracy. Online BCI system is then implemented for control of a virtual 3 degree-of-freedom prosthetic arm and tested with 3 best participants. These participants were able to successfully complete online BCI control tasks demonstrating on average the error rate of 80% and requiring 5-10 seconds to complete manipulator move.' Full text is here.


[2] Akirmak O. O., Cagdas T., Gokalp Z., Mishchenko Y. (2017) "Design of an Accessible, Powered Myoelectrically Controlled Hand Prosthesis.", TEM Journal, 6, 479, details, full text.
In this paper, an accessible myoelectric prosthetic hand design is described based on a modification of prior available mechanical prosthesis and all off-the-shelf parts and components. Despite significant advances in myoelectric prosthetics, existing such devices are firmly out of reach for a majority of the patients needing them, due to high cost and complexity of existing designs. This paper offers a simple design for a myoelectric prosthetic built on base of an existing mechanical prosthesis, which can be assembled with minimal expertise and all readily available parts, at approximately 1% the price of the cheapest commercially available such prosthetic. Full text is here.


[3] Mishchenko Y., Ji C.-R. (2017) "Dark matter phenomenology of high speed galaxy cluster collisions.", European Physical Journal, 77, 505; arXiv:1511.00597, details, full text.
The paper provides a numerical study of various possible conditions of colliding galaxy clusters and searches for signatures that could be left in such collisions by weak self-interactions of dark matter. Certain such signatures are found and related to some recent observations in galaxy cluster collisions' astrophysics.' Full text is here.


[4] Mishchenko Y., Kaya M., Comert M. (2017) "A brain-computer interface detection of right and left hand movement imageries from EEG data using SVM machine learning method.", TUBAV Bilim Dergisi, 10 (3), 1-20, details, full text.
This paper is a tutorial-like resource in Turkish for constructing EEG BCI systems' hardware and performing signal processing in them for detection of BCI mental imageries.' Full text is here.


[5] Mishchenko Y. (2016) "Application of the radial distribution function for quantitative analysis of neuropil microstructure in stratum radiatum of CA1 region in hippocampus.", Medical Research Archives, 4(4), 10.18103/mra.v4i4.604, BioRxiv 003863, details, full text.
Various structures in the brain contain many important clues to the brain's development and function. Among these, the organization of neuropil tissue at micron scales is of particular importance since such organization has a direct potential to affect the formation of synaptic connectivity between nearby axons and dendrites, thus, serving as an important factor contributing to the brain's development and disorders. While the organization of the brain at large and intermediate scales had been well studied, the microscopic organization of neuropil tissue remains largely unknown. In particular, presently it is not known what specific structures exist in neuropil at micron scales, what effect such structures have on synaptic connectivity, and what processes shape the neuropil's organization at micron scales. The present work performs an analysis of recent complete electron microscopy reconstructions of blocks of hippocampal CA1 neuropil tissue in rat to produce answers to these questions.'... Full text is here.


[6] Mishchenko Y. (2016) "Recent Advances in Neural Connectivity Inference Problem for Very Large Scale Population Calcium Imaging." in Neuroimaging, SM E-books, www.smgebooks.com/neuroimaging, details, full text.
This Neuroimaging e-book chapter chapter provides a technical overview of some of the important recent advances in computational connectivity inference from very large-scale population calcium imaging data, emphasizing specifically the opportunities that became open in population calcium imaging thanks to such advances. The chapter discusses the current status of the problem of computational deconvolution of calcium fluorescence signals, inference of neural connectivity from population calcium imaging data, and the recent advances related to the so-called sparse or "shotgun" neural activity imaging. The chapter presents a theoretical framework based on the notion of effective connectivity that can be used to combine recent computational and experimental advances in large-scale population calcium imaging and provide the foundation for rapid advancements in quantitative understanding of the neural circuits in the brain. Chapter's link is http://www.smgebooks.com/neuroimaging/chapters/NI-16-08'... Full text is here.


[7] Kaya M., Yanar H., Mishchenko Y. (2016) "Developing computational infrastructure for an EEG-based brain computer interface." in Signal Processing and Communications Applications Conference (SIU), 2016 24th, Zonguldak, 2016, 88. , details, full text.
The paper reports on the development of EEG slow cortical potential-based brain computer interface and the software tools created in the course of that development. Full text is here.


[8] Mishchenko Y. (2016) "Consistent estimation of complete neuronal connectivity in large neuronal populations using sparse 'shotgun' neuronal activity sampling.", Journal of Computational Neuroscience, 41, 158-184, details, full text.
This paper analyses recently proposed "shotgun" neuronal activity imaging solution for impossibility of completely imaging large neuronal circuits in the brain with required accuracy. The paper offers a number of theoretical results establishing correctness of complete neuronal connectivity matrices reconstructions with this type of "sparse" neuronal activity monitoring, as well as establishing necessary conditions that need to be met by imaging protocol designs to insure such correctness. A numerical Expectation Maximization Sequantial Monte-Carlo algorithm is also provided for solving resulting estimation problem in general neuronal activity models. Full text is here.


[9] Yanar H., Mishchenko Y. (2016) "A hidden Markov Model of electroencephalographic brain activity for advanced EEG-based brain computer interfaces." in Signal Processing and Communications Applications Conference (SIU), 2016 24th, Zonguldak, 2016, 89. , details, full text.
The paper presents the development of a hidden Markov Model based approach for the analysis of EEG-signals for applications in EEG-based brain computer interfaces. Full text is here.


[10] Mishchenko Y. (2015) "Variability in cellular gene expression profiles and homeostatic regulation.", BioRxiv 021048, doi: 10.1101/021048, details, full text.
The paper looks into recent issue of "stochastic variability" in make-up of living cells that are thought to have to be identical (that is same genotype, same environment, same phenotype). It is shown that rather straightforward effect of such cells homeostatically maintaining their internal state would lead very generally to similar phenomenon of "stochastic variability" of the internal make-up of identical organisms. Full text is here.


[11] Mishchenko Y. (2015) "A function for fast computation of large discrete Euclidean distance transforms in three or more dimensions in Matlab.", Signal, Image and Video Processing, 9, 19, details, full text.
This paper describes a fast line scan algorithm for calculations of discrete Euclidean distance transform in dimensions three or higher, also available from Matlab Central as function "bwdistsc". Implemented in Matlab as a plain script, described algorithm outperforms standard compiled Matlab's Image Processing Toolbox's function "bwdist" in terms of the calculation time by a factor of two. Described implementation also allows processing data of much larger size and calculations of the Euclidean distance transform with the data having anisotropic pixel dimensions (aspect ratio). Full text is here.


[12] Mishchenko Y., Kaya M. (2015) "Detecting the attention state of an operator in continuous attention task using EEG-based brain-computer interface.", in Signal Processing and Communications Applications Conference (SIU), 2015 23th, Malatya, 2015, pp. 232-235, details, full text.
An EEG-BCI system for detecting the attention states of process or machinery operators in primarily passive control task. Suggests and SVM+EEG-BCI system for identification of focused, unfocused and sleepy states of passive control task operators and demonstrates validity on certain virtual reality application. Full text is here.


[13] Marblestone A., Daugharthy E., Kalhor R., Peikon I. D., et al. (2014) "Rosetta Brains: A Strategy for Molecularly-Annotated Connectomics.", arXiv:1404.5103, details.
The paper discusses a novel connectomics approaches based on expressing two random genetic codes in pre- and post-synaptic neuronal cells, and reading out the combinations of the code pairs at actual synapses using a novel time-based fluorescent readout technique.


[14] Mishchenko Y. (2014) "Oscillations in rational economies.", PLoS ONE 9(2), e87820, details, full text.
Economic fluctuations or business cycles are some of the most noted features of market economies also ranked among the most serious of economic problems. Despite a large number of economic cycle theories developed over the past two hundred years, the causes of the cycles remain a mystery and every new recession that hits global economy (such as the Great Recession of 2007) is attributed to a new set of reasons, notably, tied commonly to irrationalities in human economic behavior such as crowd effects, speculations, erroneous policy or strategy decisions, incomplete market information, etc. This paper shows that boom-bust cycles, in fact, are an integral part of open market economies caused by rational competitive dynamics in open markets. The paper does so by using an example of extremely simple and fundamental model of single commodity market with several rational producers. It is shown that already this most fundamental market setting possesses a property otherwise known as "Tragedy of"... Full text is here.


[15] Rah J.-C., Bas E., Colonell J., Mishchenko Y., et al. (2013) "Thalamocortical input onto layer 5 pyramidal neurons measured using quantitative large-scale array tomography.", Frontiers in Neural Circuits, 7, 177, details, full text.
The paper is the first work to perform a large scale imaging of thalamocortical synapsesusing array-tomography imaging technique and detection of synapses from such optical data using co-localization of fluorescent dies associated to pre- and post-synaptic structures (see further Mishchenko Y. (2010) On Optical Detection of Densely Labeled Synapses in Neuropil and Mapping Connectivity with Combinatorially Multiplexed Fluorescent Synaptic Markers. PLoS ONE 5(1): e8853). The paper verifies and quantifies the accuracy of co-localization optical detection of synapses directly against correlative EM data, and then uses imaging of a large segment of volume of layer 5 cortical tissue to reconstruct a large number of thalamocortical synapses and to relate such synaptic distributions to the properties of thalamocortical input onto layer 5 pyramidal neurons. Full text is here.


[16] Marblestone A., Daugharthy E., Kalhor R., Peikon I., et al. (2013) "Conneconomics: The Economics of Large-Scale Neural Connectomics.", BioRxiv 001214, doi: 10.1101/001214, details, full text.
The paper discusses prospects and economic aspects of application of two types of connectomics approaches - large scale dense electron microscopy imaging and reconstruction of neural tissue and Synaptic Brainbow/BOINC based approaches. Full text is here.


[17] Mishchenko Y., Paninski L. (2012) "A Bayesian compressed-sensing approach for reconstructing neural connectivity from subsampled anatomical data.", Journal of Computational Neuroscience, 33(2), 371, details, full text.
In recent years, the problem of reconstructing the connectivity in large neural circuits ("connectomics") has re-emerged as one of the main objectives of neuroscience. Classically, reconstructions of neural connectivity have been approached anatomically, using electron or light microscopy and histological tracing methods. This paper describes a statistical approach for connectivity reconstruction that relies on relatively easy-to-obtain measurements using fluorescent probes such as synaptic markers, cytoplasmic dyes, transsynaptic tracers, or activity-dependent dyes. We describe the possible design of these experiments and develop a Bayesian framework for extracting synaptic neural connectivity from such data. We show that the statistical reconstruction problem can be formulated naturally as a tractable L_1-regularized quadratic optimization. As a concrete example, we consider a realistic hypothetical connectivity reconstruction experiment in C. elegans, a popular neuroscience... Full text is here.


[18] Rivera-Alba M., Vitaladevuni, S. N., Mishchenko, Y., et al. (2011) "Wiring economy and volume exclusion determine neuronal placement in the Drosophila brain.", Current Biology, 21, 2000, details, full text.
This paper uses newly developed techniques for semi-automated reconstruction from serial electron microscopy (EM) to obtain the shapes of neurons, the location of synapses, and the resultant synaptic connectivity in a module of the Drosophila melanogaster brain known as lamina cartridge. Relying on these reconstructions, it proposes that wiring length minimization and volume exclusion together can explain the structure of the lamina microcircuit. Full text is here.


[19] Mishchenko Y. (2011) "Reconstruction of complete connectivity matrix for connectomics by sampling neural connectivity with fluorescent synaptic markers.", Journal of Neuroscience Methods 196, 289, details, full text.
Physical organization of the nervous system is a topic of great interest in neuroscience. Although significant amount of knowledge about brain structures had been accumulated in the past, many details of nervous system organization and its role in animals? behavior remain obscure, while the problem of complete connectivity reconstructions has recently re-emerged as one of the major directions in modern neuroscience (i.e. connectomics). In this paper I talk about a novel paradigm for reconstructions of neural connectivity that can yield connectivity maps with high resolution, high speed of imaging, and robust and transparent data analysis. In essence, it is proposed that physical connectivity in a neural circuit can be sampled using anatomical fluorescent synaptic markers localized to different parts of the neural circuit with a technique for randomized genetic targeting such as Cre/Lox. High-resolution connectivity maps then can be extracted from particular datasets thus obtained. I describe... Full text is here.


[20] Mishchenko Y., Paninski L. (2011) "Efficient methods for sampling spike trains in networks of coupled neurons.", Annals of Applied Statistics, 5, 1893, details, full text.
Monte Carlo approaches have recently been proposed to quantify and estimate connectivity in neuronal networks. The key problem is to sample from the conditional distribution of a single neuronal spike train, given the activity of the other neurons in the network. Dependencies between neurons are usually relatively weak; however, temporal dependencies within the spike train of a single neuron are typically strong. In this paper we develop several Metropolis-Hastings samplers which are specialized to take advantage of this dependency structure. These samplers are based on two ideas: 1) an adaptation of fast forward-backward algorithms from the theory of hidden Markov models to take advantage of the local dependencies inherent in spike trains, and 2) a first-order expansion of the conditional likelihood which allows for efficient exact sampling in the limit of weak coupling between neurons. We also demonstrate that these samplers can effectively incorporate side information, in particular... Full text is here.


[21] Mishchenko Y., Vogelstein J., Paninski L. (2011) "A Bayesian approach for inferring neuronal connectivity from calcium fluorescent imaging data.", Annals of Applied Statistics, 5, 1229, details, full text.
In this paper we develop a statistical method for inferring neural connectivity matrix from neural population spontaneous activity recording with fluorescent calcium imaging, and study how well such performance may be done under various experimental conditions. We find that such inference may be performed remarkably well, allowing quite accurate estimation of the functional connectivity matrix under plausible neuro-biological and imaging conditions from observation containing ~1500-3000 spikes per neuron (~5-10 min observation of neural population spontaneously spiking ~5Hz). One interesting, unexpected conclusion is that this observation time requirement does not grow with the size of neural population. Ie, even for very large neural circuits, ~100-1000 neurons, connectivity matrix can be inferred by monitoring their activity for the same duration. That's definitely a very valuable property of this method. The package containing Matlab code used in this work can be downloaded from'... Full text is here.


[22] Mishchenko Y., Hu T., Spacek J., et al. (2010) "Ultrastructural analysis of hippocampal neuropil from the connectomics perspective.", Neuron, 67(6), 1009, details, full text.
Complete reconstructions of vertebrate neuronal circuits on the synaptic level require new approaches. Here, serial section transmission electron microscopy was automated to densely reconstruct four volumes, totaling 670 ?m^3, from the rat hippocampus as proving grounds to determine when axo-dendritic proximities predict synapses. First, in contrast with Peters' rule, the density of axons within reach of dendritic spines did not predict synaptic density along dendrites because the fraction of axons making synapses was variable. Second, an axo-dendritic touch did not predict a synapse; nevertheless, the density of synapses along a hippocampal dendrite appeared to be a universal fraction, 0.2, of the density of touches. Finally, the largest touch between an axonal bouton and spine indicated the site of actual synapses with about 80% precision but would miss about half of all synapses. Thus, it will be difficult to predict synaptic connectivity using data sets missing ultrastructural details'... Full text is here.


[23] Mishchenko Y. (2010) "On optical detection of densely labeled synapses in neuropil and mapping connectivity with combinatorially multiplexed fluorescent synaptic markers.", PLoS ONE 5(1): e8853, details, full text.
In this paper I use complete reconstruction of a volume of neuropil from series of electron micrographs, at a few nm resolution, to show that light microscopy techniques such as isotropically diffraction limited light microscopy (ie array tomography or LM on ultra-thin slices) and linear structured illumination microscopy are sufficient to observe individual synapses in dense neuropil with accuracy over 99%. I use this fact to suggest an approach to mapping connectivity in a neural circuit by labeling synapses of different groups of cells using distinct color fluorescent synaptic markers, and then scanning neuropil optically searching for synaptic puncta of given color - thus identifying the location and number and size of all synapses between given populations of neurons. Full text is here.


[24] Mishchenko Y. (2009) "Nontrivial vacuum solutions in flavor mixing and critical phenomena.", VDM Verlag: Saarbrucken, 228p, details.
My PhD dissertation published as a book. The book.


[25] Mishchenko Y. (2009) "Automation of 3D reconstruction of neural tissue from large volume of conventional serial section transmission electron micrographs.", Journal of Neuroscience Methods 176, 276, details, full text.
This paper publishes methods for segmentation and tracing of neural processes in the images acquired with serial section transmission electron microscopy of neural tissue. The above two tasks can be seen as part of neural circuits reconstruction problem, using the tools of electron microscopy, which involves identification of synapses, segmentation of axonal and dendritic processes, and tracing them toward cell body in order to establish presence of a connection between two cell in a neural circuit. Such approach is considered to be the main option for large scale, complete, and detailed anatomical reconstructions of neural circuits; although some significant problems with this paradigm had been found and discussed in this paper. [Open access: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948845/] Full text is here.


[26] Mishchenko Y. (2008) "Strategies for identifying exact structure of neural circuits with broad light microscopy connectivity probes.", Nature Precedings; retrieved http://hdl.handle.net/10101/npre.2009.2669.2, details, full text.
In this paper I study the possibility of reconstructing anatomical connectivity matrix of a neural circuit in the brain, from an ensemble of measurements performed with fluorescent synaptic markers genetically introduced into transgenic model to express in random manner in different neurons. This setup can be treated as random sampling of the connections from the connectivity matrix, which therefore allows to infer the connectivity matrix from a sample of such measurements using the analysis methods of compressive sensing. Analysis of potential performance of such approach in one popular neuroscience model, C. elegans, leads to very encouraging results, implying that complete connectivity in that animal can be routinely reconstructed over a span of a few days - a fit yet unheard of in neuroscience. Full text is here.


[27] Mishchenko Y. (2006) "Remedy for the fermion sign problem in the diffusion Monte Carlo method for few fermions with antisymmetric diffusion process.", Physical Review E 73, 026706, details, full text.
This works introduces an original "solution" to so called fermion problem of diffusion Monte Carlo. Diffusion Quantum Monte Carlo is a method for solving Schrodinger equation using what is now known particle filtering, ie by interpreting solution wave-function as density of diffusing particles, and then simulating diffusion corresponding to particular potential in Schrodinger equation. Fermion sign problem is a very old issue with this paradigm, applied to calculation of the ground states of fermion, since the true ground state of Schrodinger equation is always bosonic, and fermionic ground state is exp-weak fluctuation on top of it. Solution proposed in this paper was to supplement Schrodinger equation with non-local anti-symmetrization operator, which makes fermion state the true ground state of the problem. This solution was moderately successful, whereas non-local nature of the anti-symmetrization operator led to complications extending this idea to higher dimensional problems. Ultimately... Full text is here.


[28] Ji C.-R., Mishchenko Y., Radyushkin A. (2006) "Higher Fock state contributions to the generalized parton distribution of pion.", Physical Review D 73, 114013, details, full text.
This work is a pQCD study in Light Front of the pion generalized parton distribution (GPD) computed in an effective theory with exponential wave-function representation of quarks, which was shown earlier by C.-R. Ji to reproduce pion form-factors rather well. The leading perturbative contribution to pion's GPD correspond to 2-body state of that theory only. This particular work calculates the next-to-leading correction containing 3-body state (ie gluon exchange corrections).' Full text is here.


[29] Ji C.-R., Mishchenko Y. (2005) "Time to space conversion in quantum field theory of flavor mixing.", Annals of Physics 315, 488, details, full text.
In this work we study translation of high-frequency flavor oscillation effects, found in quantum field theory for flavor mixing and primarily related to virtual anti-particle creation associated with the flavor oscillations, into space-domain. In particular, we predict a small antiparticle anti-beam, traveling in the direction opposing to flavor particles, that should exist in particles oscillating further away from relativistic regime, such as Kaons or eta. Full text is here.


[30] Bakker B., DeWitt M., Ji C.-R., Mishchenko Y. (2005) "Restoring the equivalence between the light-front and manifestly covariant formalisms.", Physical Review D 72, 076005, details, full text.
This work studies the phenomenon that certain diagrams in perturbative quantum field theory (QFT), nonvanishing when written covariantly, vanish in Light Front reference frame. The problem is linked, in this paper, to two types of limits, not performed carefully typically when going to Light Front reference frame. Outer arc integration limit is one of them, whereas when reducing covariant integrands by integrating out one of the momentum variables using Cauchy residues, the infinite arc closing the contour is often dismissed, even in certain cases it gives contribution to the integral, as we show. The second type of limits is the case where particular cingular points on the integration axis of the remaining integrand give a finite-constant contribution. Properly taking care of these limits restore the equivalence between LF and covariant frames without need for any ad-hoc regularization prescriptions. Full text is here.


[31] Mishchenko Y., Ji C.-R. (2005) "General formulation of flavor mixing in Quantum Field Theory.", in O. Kovras (ed.): Focus on Quantum Field Theory, Nova Science Publisher, pp115-149, details.
A book chapter on our general formalism for quantum-field-theoretic mixing.


[32] Mishchenko Y., Ji C.-R. (2005) "A novel variational approach for quantum field theory: example of study of the ground state and phase transition in nonlinear sigma model.", International Journal of Modern Physics A 20, 3488, details, full text.
We study here a novel approach to finding ground state of a quantum field theory. Ground state is the quantum state of a field theory that minimizes its energy, E[H]. Since quantum state is, in general, a functional, such optimization, in general, is very difficult. In some cases, E[H] can be decomposed into a sum of fairly simple expectations. An obvious example - E[H]=E[K]+E[V], where K is kinetic energy term, and V is the potential. The essence of this work is to solve variational problem in terms of this expectation values after finding a set of constraints they should satisfy. I.e., instead of solving variational functional problem, solve min A + B, where A and B are simply numbers, A=E[K], B=E[V], satisfying constraints C(A,B)=0 established by analyzing (E[K],E[V]) for all possible quantum states. Here, this approach is applied to studying nonlinear sigma model. Full text is here.


[33] Mishchenko Y., Ji C.-R. (2005) "Exploring properties of dark and visible mass distribution on different scales in the Universe.", International Journal of Modern Physics A 20, 3124, details, full text.
This work re-iterates our earlier finding that the log-mass density of the visible (shining) and the dark (non-shining) matter in spiral galaxies and at least in one galaxy cluster respects amazing linear correlation, i.e. log rho_v = k log rho_d. What's most interesting is that the proportionality constant is the same both in the case of spiral galaxies and the galaxy cluster, k=4. Our earlier interpretation of this fact, re-iterated here, is in terms of thermodynamic Boltzman law, which leads to two conclusions: a) dark and visible components are in near-thermal equilibrium, which means that dark matter in fact is quite strongly interacting, and b) mass of dark matter particles is about 1/4 that of the proton mass, or 250MeV.' Full text is here.


[34] Capolupo A., Ji C.-R., Mishchenko Y., Vitiello C.-R. (2004) "Phenomenology of flavor oscillations with nonperturbative effects from quantum field theory.", Physics Letters B 594, 135, details, full text.
In this paper we study the applications of our formalism for QFT of flavor mixing, predicting in particular high-frequency oscillations component in flavor mixing primarily due to virtual anti-particles creation during oscillations, to phenomenologically interesting cases - neutrinos, kaons and eta. Full text is here.


[35] Ji C.-R., Mishchenko Y., Shalaby A. (2004) "Duality and canonical transformations in the scalar field theory.", in S. G. Pandalai: Recent Developments in Physics, vol. 5, Transworld Research Network, pp1487-1510, full text.


[36] Mishchenko Y. (2004) "Applications of Canonical Transformations and Nontrivial Vacuum Solutions to Flavor Mixing and Critical Phenomena in Quantum Field Theory.", Ph.D. Dissertation(Supervisor: C.-R. Ji), UMI-31-54334, 226pp, full text.


[37] Mishchenko Y., Ji C.-R. (2004) "Distribution of mass in galaxy cluster CL0024 and the particle mass of dark matter.", in J. Val Blain (ed.): Progress in Dark Matter Research, Nova Science Publisher, pp217-239, details, full text.
A book chapter with some more detailed analysis of the distributions of visible and dark mass in the galaxy cluster CL0024. Full text is here.


[38] Mishchenko Y., Ji C.-R. (2003) "Molar mass estimate of dark matter from the dark mass distribution measurements.", Physical Review D 68, 063503, details, full text.
We present an amazing observation that the log-mass density of the visible (shining) and the dark (non-shining) matter in spiral galaxies and at least in one galaxy cluster respects linear correlation, i.e. log rho_v = k log rho_d, with the same proportionality constant k=4. We interpret this fact in terms of thermodynamic Boltzman law, which leads to two conclusions: a) dark and visible components are in near-thermal equilibrium, which means that dark matter in fact is quite strongly interacting, and b) mass of dark matter particles is about 1/4 that of the proton mass, or 250MeV. Full text is here.


[39] Ji C.-R., Mishchenko Y. (2002) "The general theory of quantum field mixing.", Physical Review D 65, 096015, details, full text.
In this paper we develop general quantum-field-theoretic formalism for studying quantum flavor mixing of particles, for arbitrary number of flavors and arbitrary spin. Special cases of spin 0 (mesons), spin 1/2 (neutrinos) and spin 1 (vector-mesons) are explicitly considered. Full text is here.


[40] Ji C.-R., Mishchenko Y. (2001) "Nonperturbative vacuum effect in the quantum field theory of meson mixing.", Physical Review D 64, 076004, details, full text.
In this paper we derive high-frequency oscillations contribution in flavor oscillations of mesons. Full text is here.


[41] Mishchenko Y. (2000) "Nonperturbative Mass Renormalization in 2+1 Scalar Yukawa Model.", M.Sc. Thesis (Supervisor: I. Simenog), unpublished master thesis, full text.


[42] Mishchenko Y. (1999) "Precision Quantum Mechanical Variational Calculations of Three-Body Coulomb System (dtmu).", B.Sc. thesis (Supervisor: I. Simenog), unpublished bachelor thesis, full text.