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Practical obstacles and their mitigation strategies in compressional optical coherence elastography of biological tissues

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Journal of Innovative Optical Health Sciences 2017年第6期10卷 51-63页

作者： vladimir Y.Zaitsev Alexandr L.Matveyev Lev A.Matveev ekaterina v.Gubarkova Alexandr A.Sovetsky Marina A.Sirotkina Grigory v.Gelikonov Elena v.Zagaynova natalia D.Gladkova Alex vitkin Institute of Applied Physics Russian Academy of Sciences Ulyanova Street 46 nizhny novgorod 603950 Russia nizhny novgorod State Medical Academy 10/1 Minina Square nizhny novgorod 603005 Russia University of Toronto and University Health network 610 University Avenue Toronto ON M5G 2M9Canada

In this paper,we point out some practical obstacles arising in realization of compressional optical coherence elastography(OCE)that have not attracted sufficient attention ***-cally,we discuss(i)complications in quantification of the Young modulus of tissues related to partial adhesion between the OCE probe and soft intervening reference layer sensor,(i)distorting influence of tisue suface curvature/corrugation on the subsurface strain distri-bution mapping,(ii)ways of signal-to-noise mtio(SnR)enhancement in OCE strain mapping when periodic averaging is not realized,and(iv)potentially significant infuence of tissue elastic nonlinearity on quantification of its *** pnactical approaches to mitigate the effects of these complications are also described.

关键词： Optical coherence elastography optical coherence tomography phase-resolved methods strain mapping stiffness characterization

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novel Synthesis Method of nonst0ichiometric na2-xlrO3 Crystal Structure, Transport and Magnetic Properties

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Journal of Chemistry and Chemical Engineering 2016年第4期10卷 153-160页

作者： Katharina Rolfs ekaterina Pomjakushina Denis Sheptyakov Kazimierz Conder Laboratory for Scientific Development and novel Materials Paul Scherrer Institute Hlligen PSI 5232 Switzerland Laboratory for neutron Scattering and lmaging Paul Scherrer Institute Villigen PSI 5232 Switzerland

Transition metal oxides with 4d or 5d metals are of great interest due to the competing interactions, of the Coulomb repulsion and the itineracy of the d-electrons, opening a possibility of building new quantum ground states. Particularly the 5d metal oxides containing Iridium have received significant attention within the last years, due to their unexpected physical properties, caused by a strong spin orbit coupling observed in It（iv）. A prominent example is the Mott-insulator Sr2IrO4. Another member of this family, the honeycomb lattice compound na2IrO3, also being a Mott-insulator having, most probably, a Kitaev spin liquid ground state. By deintercalating sodium from na2IrO3, the authors were able to synthesize a new honeycomb lattice compound with more than 50% reduced sodium content. The reduction of the sodium content in this layered compound leads to a change of the oxidation state of iridium from ＋ iv to ＋ v/＋ vI and a symmetry change from C2/c to P-3. This goes along with significant changes of the physical properties. Besides the vanishing magnetic ordering at 15 K, also the transport properties changes and instead insulating semiconducting properties are observed.

关键词： Strongly correlated electron systems iridates oxidation neutron diffraction

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