Staff
 
 
 
   

Dr. Lev A. Matveev
Research Scientist at the Department of nonlinear geophysical processes
Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), Ph.D.

Date and place of birth:
18.05.1984 in Nizhniy Novgorod, Russia (former Gorky, USSR)
Nationality:
Russian Federation
Family status:
Married to Natalia Matveeva, daughter Maria Matveeva (Birthday: Jan. 16, 2012)

Education:
09.2001 – 06.2005
Bachelor degree at the Radiophysical dept. Nizhniy Novgorod State University
Bachelor thesis: “Strain-amplitude dependent dissipation in linearly dissipative and nonlinear elastic microinhomogeneous media”
09.2005 – 06.2007
Master degree at the Radiophysical dept. Nizhniy Novgorod State University
Master thesis: “Non-classical modulation effects and strain-amplitude dependent dissipative properties in the microinhomogeneous elastic media” (Supervisor Dr. Vladimir Yu. Zaitsev, master thesis received an award at the National competition organized by the Russian Ministry of Education)
07.2007 – 06.2010
Ph.D. Student at the Institute of Applied Physics of the Russian Academy of Sciences
Ph.D. thesis: “Non-classical manifestations of the microstructure-induced acoustic nonlinearity of elastic media” (Supervisor Dr. Vladimir Yu. Zaitsev, thesis was defended on May 31, 2010, in a dissertation council D002.069.01 in IAP RAS, Nizhny Novgorod)

Research topics:
· Non-linear acoustic effects for using in nondestructive testing, material characterization and
geophysical applications
· Investigation of mechanical and acoustical properties of inhomogeneous media
· Signal and image processing for elasticity mapping in Optical Coherence Tomography (OCT)

Work experience:
09.2005 – 06.2007
Assistant at the Department of nonlinear geophysical processes IAP RAS
07.2007 – 01.2011
Junior Research Scientist at the Department of nonlinear geophysical processes IAP RAS
02.2011 – present
Research Scientist at the Department of nonlinear geophysical processes IAP RAS
06.2012 – present
Research Scientist at the MedLAB of the Radiophysical Faculty of the Nizhniy Novgorod State
University
10.2013 – present
Research Scientist at the OCT Lab of Institute of Biomedical Technologies of the Nizhniy Novgorod State Medical Academy

Research visits:
· 2009 Visiting Researcher at the Acoustics Laboratory of the Université du Maine
· 2011 Visiting Researcher at the Acoustics Laboratory of the Université du Maine
Visits were organized by CNRS (PICS Project “Studies of dynamics and structure of granular materials and
related contact-containing systems using novel diagnostic possibilities based on the nonlinear acoustic
approach”)

Involvement:
Member of Society of Photo-Optical Instrumentation Engineers (SPIE)

Reviewer of:
Journal of Biomedical Optics
Acta Acustica united with Acustica

Scholarships and awards:
· National award for Master thesis from Russian Ministry of Education, 2007
· G.A. Razuvaev Scholarship from the Nizhny Novgorod Region Administration to the best
graduate students, 2008-2010
· Ph.D. Student Award for foreign students from the Acoustical Society of America, 2009

Publications:
Total: 51
· Articles in refereed journals: 12
· Papers in Proceedings of the International Conferences: 13
· Papers in Proceedings of the National Conferences: 15
· Abstracts of Presentations: 11

Most significant series of publications:

I. A series of papers "Elasticity mapping in optical coherence tomography":

V. Y. Zaitsev, L. A. Matveev, G. V Gelikonov, A. L. Matveyev, and V. M. Gelikonov, "A correlation-stability approach to elasticity mapping in optical coherence tomography," Laser Physics Letters, 10(6), 065601(1-5) (2013). [DOI: http://dx.doi.org/10.1088/1612-2011/10/6/065601]

V.Y. Zaitsev, L. A. Matveev, A. L. Matveyev, G.V. Gelikonov, and V.M. Gelikonov, "Elastographic mapping in optical coherence tomography using an unconventional approach based on correlation stability," Journal of Biomedical Optics, 19(2), 021107(1-13) (2014) [DOI: http://dx.doi.org/10.1117/1.JBO.19.2.021107]

L.A. Matveev, V.Yu. Zaitsev, A.L. Matveyev, G.V. Gelikonov, V.M. Gelikonov “Correlation-stability approach in optical microelastography of tissues,” Proc. SPIE, V. 8699, pp. 869904(1-10) , (2013) [DOI: http://dx.doi.org/10.1117/12.2018377‎]

V. Y. Zaitsev, L. A. Matveev, A. L. Matveyev, G. V. Gelikonov, and V. M. Gelikonov, "Correlation-stability elastography in OCT: algorithm and in vivo demonstrations," Proc. SPIE. Vol. 8802 pp. 880208–(1–11) ,  (2013) [DOI: http://dx.doi.org/10.1117/12.2032631].

Abstract of research:
An approach to elastographic mapping in optical coherence tomography (OCT) using comparison of correlation stability of sequentially obtained intensity OCT images of the studied strained tissue is discussed. The basic idea is that for stiffer regions, the OCT image is distorted to a smaller degree. Consequently, cross-correlation maps obtained with compensation of trivial translational motion of the image parts using a sliding correlation window can represent the spatial distribution of the relative tissue stiffness. An important advantage of the proposed approach is that it allows one to avoid the stage of local-strain reconstruction via error-sensitive numerical differentiation of experimentally determined displacements. Another advantage is that the correlation stability (CS) approach intrinsically implies that for deformed softer tissue regions, cross-correlation should already be strongly decreased in contrast to the approaches based on initial reconstruction of displacements. This feature determines a much wider strain range of operability than the proposed approach and is favorable for its free-hand implementation using the OCT probe itself to deform the tissue. The CS approach can be implemented using either the image elements reflecting morphological structure of the tissue or performing the speckle-level cross-correlation. Examples of numerical simulations and experimental demonstrations using both phantom samples and in vivo obtained OCT images are presented.

II. A series of papers "Elastic-wave modulation approach to crack detection":

V.Yu. Zaitsev, L.A. Matveev, A.L. Matveyev "Elastic-wave modulation approach to crack detection: comparison of conventional modulation and higher-order interactions," NDT&E int, 2011, V.44, Issue 1, Pp 21-31 [DOI: http://dx.doi.org/10.1016/j.ndteint.2010.09.002]

V. Yu.Zaitsev, L.A. Matveev, A.L. Matveyev "On the ultimate sensitivity of nonlinear-acoustic methods of crack detection," NDT&E int., 2009, V. 42, Issue 7, Pp. 622-629 [DOI: http://dx.doi.org/10.1016/j.ndteint.2009.05.001]

V.Yu. Zatsev, L.A. Matveev, A.L. Matveyev, and W. Arnold “Cascade Cross Modulation Due to the Nonlinear Interaction of Elastic Waves in Samples with Cracks,” Acoustical Physics, 2008, V. 54, No. 3, Pp. 398-407 [DOI: http:// dx.doi.org/10.1134/S1063771008030160]

V.Yu. Zaitsev, L.A. Matveev “Strain-amplitude dependent dissipation in linearly dissipative and nonlinear elastic microinhomogeneous media,” Russian Geology and Geophysics,  2006, V. 47,  No. 5, Pp. 694 [DOI: dx.doi.org/10.1134/S1069351311100156]

V. Zaitsev, L. Matveev, and A. Matveyev “Nonlinear-acoustic damage detection in solid samples: comparison between conventional modulation technique and double-modulation,” AIP Conf. Proc., V. 1022, Pp. 581-585 [DOI: http://dx.doi.org/10.1063/1.2956291]

Abstract of research:
Comparison of recent theoretical estimates with experiments has indicated that the ultimate sensitivity of the conventional modulation technique of crack detection is mainly determined by the background modulation produced by the quadratic component of the atomic nonlinearity of the matrix material. Much smaller level of masking nonlinear effects is typical of higher-order interactions due to cubic and higher-order components in the power-series expansion of the background nonlinearity of the solid. In contrast, the level of formally higher-order components originated due to nonlinearity of crack-like defects can be comparable with that of the first-order components. Such strongly increased efficiency of higher-order interactions is due to the fact that crack-like defects often demonstrate non-analytic (non power-law) nonlinearity even for moderate acoustic amplitudes. Besides the increased level, the higher-order components arisen due to non-analytic nonlinearity of cracks can demonstrate significantly different functional behavior compared to manifestations of the atomic nonlinearity. This difference can also help to discriminate the contributions of the defects and the background atomic nonlinearity. Here, we focus on the main differences between the modulation components arisen due to cubic terms in the power-series expansion of the atomic nonlinearity and similar components generated by clapping Hertzian nonlinearity of inner contacts in cracks. We also examine experimental examples of higher-order modulation interactions in damaged samples. These examples clearly indicate non-analytical character of the defects’ nonlinearity and demonstrate that the use of higher-order modulation effects can significantly improve the ultimate sensitivity and reliability of the modulation approach to detection of crack-like defects.

III. A series of papers "Modulation of HF seismic noise by tidal deformations":

V.Yu. Zaitsev, L.A. Matveev "Giant strain-sensitivity of acoustic energy dissipation in solids containing dry and saturated cracks with wavy interfaces," JASA, 2012, V. 131(1), 1-12. [DOI: http://dx.doi.org/10.1121/1.3664079]

V.Yu. Zaitsev, V.A. Saltykov, L.A. Matveev “Modulation of HF seismic noise by tidal deformations: possible physical mechanism and effect features before approaching strong earthquakes,” Izvestiya Physics of the Solid Earth, 2011, V. 47, No. 11, Pp. 951-965

V.Yu. Zaitsev, V.A. Saltykov, L.A. Matveev “Relation between the Tidal Modulation of Seismic Noise and the Amplitude-Dependent Loss in Rock,” Acoustical Physics, 2008, V. 54, No. 4, Pp. 538-544 [DOI: dx.doi.org/10.1134/S1063771008040143]

Abstract of research:
Geological materials and many other microinhomogeneous media exhibit pronounced nonlinear properties under very small strains, when one may expect an almost linear behavior of the material. These properties are conventionally described on the basis of elastically nonlinear or hysteretic models. The present paper discusses the amplitude-dependent dissipation that is unrelated to hysteretic nonlinearity but is also a universal property of microinhomogeneous media. This property allows the explanation of the effect of correlation between the tidal strains of the Earth’s crust (on the order of 10^−8) and the unexpectedly strong (on the order of 10^−2 – 10^−1) variations of seismic noise intensity, which has been observed for more than 25 years without being given any adequate interpretation.

IV. A series of papers "Microstructure-induced giant elastic nonlinearity of threshold origin":

V. Yu. Zaitsev, A Dyskin, E Pasternak, L.A. Matveev “Microstructure-induced giant elastic nonlinearity of threshold origin: Mechanism and experimental demonstration,” Europhysics Letters, 2009, V. 86, Pp. 44005 1-6 [DOI: http://dx.doi.org/10.1209/0295-5075/86/44005]

V. Yu. Zaitsev, L. A. Matveev “Giant strain-sensitivity of local acoustic dissipation near inner wavy contacts in dry and fluid-saturated cracks,” AIP Conf. Proc., V. 1433, 2011, pp. 159-162 [DOI: http://dx.doi.org/10.1063/1.3703161]

Abstract of research:
There are known numerous examples of strong physical nonlinearity of elastic microinhomogeneous materials caused by the presence of a small amount of a “soft” component (cracks, intergrain contacts, bubbles, etc.). The dimensionless parameter B/A of quadratic nonlinearity for such materials can be on the order of 10^2 – 10^3 in contrast to values on the order of unity typical of ideal crystals, homogeneous amorphous solids or liquids. The sign of this nonlinearity is such that all those materials become stiffer as pressure increases. We consider an extension of this “soft-rigid paradigm” of the nonlinearity increase by accounting for threshold-type properties intrinsic to some inclusions. We show that the nonlinearity in this case can additionally be orders of magnitude higher. We present an example of such a material which unlike “normal” media becomes softer with increasing pressure. Its quasistatic negative parameter B/A reaches ~ (0.5–1)*10^5, which to our knowledge is a record value.
           
Scientific research projects:

Project leader at the current projects:
· RFBR grant ¹ 13-02-00627-à “Studies of new approaches to shear-elastisity mapping in optical coherence tomography: analysis of physical principles, simulations, and experimental demonstrations” (2013-2015)
· President of the Russian Federation Grant ¹ MK-4826.2013.2 “Development of physical principles of elastic properties diagnostics of biological tissues with high resolution using optical coherence tomography” (2013-2014)

Responsible investigator at the current projects:
· Russian Federation Government Grant for Leading Researchers ("Megagrant") ¹ 14.B25.31.0015 "Development of new optical coherence tomography technologies to enable individualized cancer therapy" (2013-2015)
· RFBR grant ¹ 13-02-97131_povolzhe_a "Development of physical principles of optical coherence tomography for multi-parameter characterization of biological tissues" (2013-2014)
· Russian Federation Government Grant for Leading Researchers ("Megagrant") ¹ 11.G34.31.0066 "Development of technologies for biomedical diagnostics" (2011-2013)
· Russian Academy of Sciences research project “Fundamentals of acoustic diagnostics of artificial and natural media” (2009-2013)
· RFBR grant ¹ 11-05-01003-à “Structure-induced «nonclassical» nonlinear properties of Earth’s rocks: theoretical models and experiment” (2011-2013)

Responsible investigator at the completed projects:
· RFBR grant ¹ 11-02-97017-regional-a “Research of influence of fine-grained concrete structure on their non-linear acoustic properties to create effective methods of diagnostics and prediction of durability of concrete structures” (2011-2012)
· Russian Academy of Sciences research project “Development of nonlinear acoustic diagnostic for the early detection of incipient cracks with a nanometer scale” (2009- 2011)
· CNRS PICS project in cooperation with RFBR (RFBR grant ¹ 09-02-91071-CNRS) "Studies of dynamics and structure of granular materials and related contact-containing
systems using novel diagnostic possibilities based on the nonlinear-acoustic approach" (2009-2011)
· RFBR grant ¹ 08-02-97039-r_povolzhe_a "Development of nonlinear diagnostic methods and nondestructive testing of solid-state materials, constructions and production of machinery" (2008-2010)
· RFBR grant ¹ 08-05-00692-A "Tidal effects in the variations of background seismicity and seismoacoustic emission: laboratory experiments, mathematical simulation, observations in seismoactive region" (2008-2010)
· CNRS-RFBR grant ¹ 06-02-72550-CNRS “Diagnostic applications of the "nonclassical" acoustic nonlinearity: from qualitative effects to quantitative characterization” (2006-2008)
· RFBR grant ¹ 05-05-64941 “Experimental investigation of nonlinear wave processes in rocks” (2005-2007)
· RFBR grant ¹ 05-02-17355 “Microstructure-induced acoustic nonlinearity of solids: experiments and models” (2005-2007)

Language skills:

· Russian – native
· English – fluent (Upper-intermediate level)
· German – fluent (Goethe-Institute certificate B2 level, Grade 91.5/100)

Additional language courses:
· September – October 2010, Bloomsbury International Language School, London, UK
(English language, Upper-intermediate level)
· August – September 2009, DID-Deutsch Institute, Munich, Germany (German language, C1
level)
· October 2006 – December 2009, Goethe-Institute, Nizhniy Novgorod, Russia (German
language, up to C1 level)