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Nucleation of New Phases in Alloy: A Long Way to True

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Advances in Materials Physics and Chemistry 2022年第10期12卷 240-259页

作者： yuri ustinovshikov Udmurt Federal Research Center of Russian Academy of Sciences Izhevsk Russia

The article presents our generalization of electron microscopy results that got for binary and some ternary alloys based on Ni. These results are considered as the basis for the conclusion that chemical bonds between atoms are realized in binary alloys according to the principle of pair-wise chemical interaction. In ternary alloys, such a process begins with the separation of the liquid alloy into diffusion micro-pairs, inside which particles of a new phase are subsequently formed. The latter circumstance allows us to consider the liquid state of the alloy as the initial stage of the formation of a new phase. That formation of diffusion micro-pairs (and particles of a new phase inside them) occurs because of the presence of alloys, along with a metallic bond, of the ionic and covalent components of a strong chemical bond, which exist at all temperatures of the condensed state. The article shows what exactly needs to be done so that such a branch of science as the science of alloys can get rid of the empirical approach when creating new alloys.

关键词： Alloys Microstructure Electronic Structure Phase Transformation Transmission Electron Microscopy

Formation of Diffusion Pairs as an Initial Stage in the Process of Decomposition of Alloys

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Advances in Materials Physics and Chemistry 2020年第12期10卷 328-338页

作者： yuri ustinovshikov Udmurt Federal Research Center Russian Academy of Sciences Izhevsk Russia

The paper discusses the researches that formed the basis of the study of the transition of “ordering-phase separation” and the reasons for such transition occurrence. Experimental results have presented what diffusion pairs are and how they occur in binary and multicomponent alloys. The paper illustrates that the chemical bonds between atoms are realized on the principle of pair interaction in both solid and liquid states of the alloy. The process of separating a multi-component ABC alloy into diffusion pairs A/B, A/C, and B/C occurs in a liquid solution, where the diffusion mobility of atoms is very high, and the resistance of the environment is relatively low. The driving force of such a process is the chemical attraction between like and unlike atoms, that is, the tendency to phase separation and the tendency to ordering. Quenching the liquid alloy into the water fixes a microstructure consisting of microscopic areas corresponding in composition to one or another diffusion pairs. The paper shows what exactly should be done so that such a branch of science as Materials Science could get rid of the empirical approach when creating new alloys.

关键词： Ordering-Phase Separation Transition Ionic Bond ↔ Covalent Bond Pair Interaction Diffusion Pairs Transmission Electron Microscopy Superalloys

Process of New Phase Nucleation in Alloys

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材料科学与工程（中英文B版） 2021年第2期11卷 43-58页

作者： yuri ustinovshikov Udmurt Federal Research Center of Russian Academy of Sciences 34 Baramzina St.IzhevskRussia

The article presents a generalization of our electron microscopic results got on some binary and ternary alloys based on Ni,Fe or *** are considered as the basis for the conclusion that chemical bonds between atoms are realized in alloys according to the principle of pair *** process begins with the separation of the alloy into diffusion micro-pairs already in the liquid state,which makes it possible to consider the liquid state of the alloy as the initial stage of the new phase *** a subsequent decrease in temperature,particles of a new phase form inside a diffusion *** formation of diffusion micro-pairs and phases within them occurs due to the existence in alloys,along with a metallic bond,of ionic and covalent components of a strong chemical bond at all temperatures of the condensed *** article shows what exactly needs to be done so that such a branch of science as materials science could get rid of the empirical approach when creating new alloys.

关键词： “Ordering-phase separation”transition chemical bonds in alloys electronic structure of alloys diffusional micro-pairs TEM(transmission electron microscopy)

Experimental Detection of Diffusion Micro-pairs in a Structure of the Ni_(65)Mo_(20)Cr_(15)Alloy

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材料科学与工程（中英文A版） 2021年第2期11卷 63-70页

作者： yuri ustinovshikov Udmurt Federal Research Center of Russian Academy of Sciences 34 Baramzina St.IzhevskRussia

The article raises the question of how diffusion pairs A/B,A/C,and B/C form in three-component alloys *** issue solves experimentally using the TEM(transmission electron microscopy)method and Ni65Mo20Cr15 *** quenching of this alloy from a liquid showed that such pairs form in the liquid state of the alloy,and as the quenching temperature decreases,particles of the new phases form inside *** concluded that not a disordered solid solution after high-temperature quenching“from a region of disordered solid solution at the phase diagrams”is the starting point for the formation of a low-temperature microstructure,but a liquid state,into which the alloy passes during its *** author hopes the results got will lead to a reorientation of our ideas about alloys and will change a lot both in the theory of alloys and in the technology of their manufacture.

关键词： TEM superalloys new phase formation “ordering-phase separation”transition transition“ionic bond↔covalent bond”

High-Q resonant terahertz metasurfaces

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Opto-Electronic Advances 2024年第4期7卷 1-3页

作者： Manukumara Manjappa yuri Kivshar Department of Instrumentation and Applied Physics Indian Institute of ScienceBengaluru 560012India Nonlinear Physics Center Australian National UniversityCanberra ACT 2601Australia

In photonics, the quest for high-quality (high Q) resonances driven by the physics of bound states in the continuum (BIC)1,2has motivated researchers to explore innovative avenues for realizing groundbreaking applications in lasing3, sensing4and nonlinear photonics5. A conventional strategy to harness the properties of BICs involves breaking the symmetry of resonators in a uniform lattice, allowing uncoupled modes to interact with free space that opens a leaky channel in the form of socalled (quasi) q BIC6modes.

关键词： breaking resonant symmetry

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Breaking the scattering limits of water waves

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National Science Review 2024年第6期11卷 85-86页

作者： Adrià Canós Valero Thomas Weiss yuri Kivshar Institute of Physics University of Graz 4th Physics Institute University of Stuttgart Research School of Physics Australian National University

When water, light or sound waves impinge on objects smaller than the wavelength, a scattering process takes place[1]. The scattering of waves plays an essential role in a myriad of natural phenomena. In ocean engineering, enhancing the scattering of water waves allows capturing energy from larger areas, with clear implications for energy harvesting and coastal protection.

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Unveiling field-coupled nanocomputing:Leaning molecules to shape readable bits

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Nano Research 2024年第9期17卷 8447-8454页

作者： yuri Ardesi Giuliana Beretta Fabrizio Mo Chiara Elfi Spano Gianluca Piccinini Mariagrazia Graziano Corso Duca degli Abruzzi Department of Electronics and TelecommunicationsPolitecnico di TorinoTurin 10129Italy Corso Duca degli Abruzzi Department of Applied Science and TechnologyPolitecnico di TorinoTurin 10129Italy

Molecular field-coupled nanocomputing(molFCN)encodes information in the molecule charge distribution and elaborates it through electrostatic *** the advantageous sub-nanometric size and low-power dissipation,only a few attempts have been made to validate the technology *** of the obstacles is the difficulty in measuring molecule charges to validate information encoding or integrate molFCN with complementary-metal-oxide-semiconductor(CMOS).In this work,we propose a paradigm preserving the advantages of molFCN,which exploits the position of waiving molecules to augment the information *** validate the paradigm,named bend-boosted molFCN,with density functional theory using 6-(ferrocenyl)hexanethiol *** demonstrate that the encoded information can be electrically read by constituting a molecular *** paradigm is compatible with the charge-based molFCN,thus acting as a readout *** obtained results favor the experimental assessment of the molFCN principle through scanning probe microscopy techniques and the design of molFCN-CMOS heterogeneous circuits.

关键词： nanoelectronics molecular electronics field-coupled nanocomputing electronics beyond-complementary-metal-oxidesemiconductor(CMOS)

Long-term Speckle Interferometric Monitoring of Binary Systems:2007–2023Positional Measurements and Orbits of Seven Objects

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Research in Astronomy and Astrophysics 2024年第9期24卷 147-155页

作者： Arina Mitrofanova Vladimir Dyachenko Anatoly Beskakotov yuri Balega Alexander Maksimov Denis Rastegaev Special Astrophysical Observatory 369167 Nizhnij ArkhyzRussia

The results of seventeen years of speckle interferometric monitoring of seven objects(Chara 122Aa,GJ 3010,HIP1987,GJ 3076,HIP 11253,HIP 11352,and HIP 14929)are *** data were obtained at the 6 m Big Telescope Alt-azimuthal Special Astrophysical Observatory of the Russian Academy of Science(BTA SAO RAS)from 2007 to the *** of previously published and new measurements made it possible to construct completely new orbits for Chara 122Aa,HIP 11253,and HIP *** orbit of GJ 3076 cannot be constructed accurately due to the large influence of the weights assigned to the *** resulting orbital solutions are classified based on a grading scheme suggested by ***,*** and ***;most orbits are“definitive”(Grade 1).The mass sums and masses of components calculated by two independent methods using Hipparcos and Gaia DR2 and DR3 parallaxes were compared for the objects under study.

关键词： techniques:high angular resolution (stars:)binaries:visual stars:fundamental parameters stars:low-mass stars:solar-type

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Neurogenic potential of NG2 in neurotrauma:a systematic review

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Neural Regeneration Research 2024年第12期19卷 2673-2683页

作者： yuri R.Rigo Radharani Benvenutti Luis V.Portela Nathan R.Strogulski Departamento de Bioquímica Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul(UFRGS)Porto AlegreBrazil School of Pharmacy and Biomolecular Sciences RCSI University of Medicine and Health SciencesDublinIreland School of Biochemistry and Immunology Trinity Biomedical Sciences InstituteTrinity College DublinUniversity of DublinDublinIreland

Regenerative approaches towards neuronal loss following traumatic brain or spinal cord injury have long been considered a dogma in neuroscience and remain a cutting-edge area of *** is reflected in a large disparity between the number of studies investigating primary and secondary injury as therapeutic to rgets in spinal co rd and traumatic brain *** advances in biotechnology may have the potential to reshape the current state-of-the-art and bring focus to primary injury neurotrauma *** studies using neural-glial factor/antigen 2(NG2)cells indicate that they may differentiate into neurons even in the developed *** these cells show great potential to play a regenerative role,studies have been conducted to test various manipulations in neurotrauma models aimed at eliciting a neurogenic response from *** the present study,we systematically reviewed the experimental protocols and findings described in the scientific literature,which were peer-reviewed original research articles(1)describing preclinical experimental studies,(2)investigating NG2 cells,(3)associated with neurogenesis and neurotrauma,and(4)in vitro and/or in vivo,available in PubMed/MEDLINE,Web of Science or SCOPUS,from 1998 to ***,we have reviewed a total of 1504 papers,and summarized findings that ultimately suggest that NG2 cells possess an inducible neurogenic potential in animal models and in *** also discriminate findings of NG2 neurogenesis promoted by different pharmacological and genetic approaches over functional and biochemical outcomes of traumatic brain injury and spinal co rd injury models,and provide mounting evidence for the potential benefits of manipulated NG2 cell ex vivo transplantation in primary injury *** findings indicate the feasibility of NG2 cell neurogenesis strategies and add new players in the development of therapeutic alternatives for neurotrauma.

关键词： neural-glial antigen 2 neural-glial factor 2 neuron differentiation NG2 cell regeneration spinal cord injury(SCI) traumatic brain injury(TBI)

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