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Article ; Online: Resonant generation of propagating second-harmonic spin waves in nano-waveguides.

Nikolaev, K O / Lake, S R / Schmidt, G / Demokritov, S O / Demidov, V E

2024 Volume 15, Issue 1, Page(s) 1827

Abstract: Generation of second-harmonic waves is one of the universal nonlinear phenomena that have found numerous technical applications in many modern technologies, in particular, in photonics. This phenomenon also has great potential in the field of magnonics, ... ...

Abstract	Generation of second-harmonic waves is one of the universal nonlinear phenomena that have found numerous technical applications in many modern technologies, in particular, in photonics. This phenomenon also has great potential in the field of magnonics, which considers the use of spin waves in magnetic nanostructures to implement wave-based signal processing and computing. However, due to the strong frequency dependence of the phase velocity of spin waves, resonant phase-matched generation of second-harmonic spin waves has not yet been achieved in practice. Here, we show experimentally that such a process can be realized using a combination of different modes of nano-sized spin-wave waveguides based on low-damping magnetic insulators. We demonstrate that our approach enables efficient spatially-extended energy transfer between interacting waves, which can be controlled by the intensity of the initial wave and the static magnetic field.
Language	English
Publishing date	2024-02-28
Publishing country	England
Document type	Journal Article
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-024-46108-y
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Book ; Online: Ontomathedu Ontology Enrichment Method

Nevzorova, O. A. / Nikolaev, K. S.

2022

Abstract: Nowadays, distance learning technologies have become very popular. The recent pandemic has had a particularly strong impact on the development of distance education technologies. Kazan Federal University has a distance learning system based on LMS Moodle. ...

Abstract	Nowadays, distance learning technologies have become very popular. The recent pandemic has had a particularly strong impact on the development of distance education technologies. Kazan Federal University has a distance learning system based on LMS Moodle. This article describes the structure of the OntoMathEdu ecosystem aimed at improving the process of teaching school mathematics courses, and also provides a method for improving the OntoMathEdu ontology structure based on identifying new connections between contextually related concepts.
Keywords	Computer Science - Artificial Intelligence
Publishing date	2022-12-01
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Adapting the LodView RDF Browser for Navigation over the Multilingual Linguistic Linked Open Data Cloud

Kirillovich, Alexander / Nikolaev, Konstantin

2022

Abstract: The paper is dedicated to the use of LodView for navigation over the multilingual Linguistic Linked Open Data cloud. First, we define the class of Pubby-like tools, that LodView belongs to, and clarify the relation of this class to the classes of URI ... ...

Abstract	The paper is dedicated to the use of LodView for navigation over the multilingual Linguistic Linked Open Data cloud. First, we define the class of Pubby-like tools, that LodView belongs to, and clarify the relation of this class to the classes of URI dereferenciation tools, RDF browsers and LOD visualization tools. Second, we reveal several limitations of LodView that impede its use for the designated purpose, and propose improvements to be made for fixing these limitations. These improvements are: 1) resolution of Cyrillic URIs; 2) decoding Cyrillic URIs in Turtle representations of resources; 3) support of Cyrillic literals; 4) user-friendly URLs for RDF representations of resources; 5) support of hash URIs; 6) expanding nested resources; 7) support of RDF collections; 8) pagination of resource property values; and 9) support of $\LaTeX$ math notation. Third, we partially implement several of the proposed improvements.
Keywords	Computer Science - Computation and Language ; Computer Science - Artificial Intelligence ; Computer Science - Human-Computer Interaction ; 68T30 (Primary) 68T50 (Secondary) ; I.2.4 ; H.5.4
Publishing date	2022-08-28
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Depth resolved study of annealing in IrMn/(Fe, Co, CoFe) exchange bias systems

Khaydukov, Yu. / Dobrynin, A. / Hassan, S. / Ormston, M. / Nikolaev, K. / Bencok, P. / Fan, R. / Steadman, P. / Csik, A. / Vorobiev, A.

2023

Abstract: Depth resolved study of structural and magnetic profiles of antiferromagnetic/ferromagnetic (AFM/FM) system upon annealing was performed in this work. We studied systems comprising of AFM IrMn and FM (Co, Fe, Co$_{70}$Fe$_{30}$) structures using ... ...

Abstract	Depth resolved study of structural and magnetic profiles of antiferromagnetic/ferromagnetic (AFM/FM) system upon annealing was performed in this work. We studied systems comprising of AFM IrMn and FM (Co, Fe, Co$_{70}$Fe$_{30}$) structures using polarized neutron and soft X-ray scattering, secondary neutral spectrometry, and magnetometry. Structural depth profiles obtained from neutron reflectometry indicate non-homogeneity of the AFM layer even before annealing, which is associated with the migration of manganese to the surface of the sample along grain boundaries. Annealing of samples with CoFe and Co layers leads to a slight increase in the migration of manganese, which, however, does not lead to significant degradation of the exchange coupling at the AFM/FM interface. A significantly different picture was observed in the Fe/IrMn systems where a strong migration of iron into the AFM layer was observed upon annealing of the sample, leading to erosion of the magnetic profile, the formation of a non-magnetic alloy and degradation of the pinning strength. This study can be useful in the design of AF/FM systems in different spintronics devices, including HDD read heads, where thermal annealing is applied at different stages of the device manufacturing process.
Keywords	Condensed Matter - Materials Science ; Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Strongly Correlated Electrons
Subject code	530
Publishing date	2023-11-08
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: [Clinical and morphological features of breast cancer in men].

Nikolaev, K S

Voprosy onkologii

2013 Volume 59, Issue 3, Page(s) 358–362

Abstract: Breast cancer in men is 100 times less common than in women. The main risk factors include: the mutation of genes BRCA 1 and 2, Klinefelter's syndrome, alcohol, liver disease, obesity. Clinical examinations, mammography and ultrasound are informative and ...

Abstract	Breast cancer in men is 100 times less common than in women. The main risk factors include: the mutation of genes BRCA 1 and 2, Klinefelter's syndrome, alcohol, liver disease, obesity. Clinical examinations, mammography and ultrasound are informative and highly sensitive for early detection of these tumors, but are rarely implemented due to lack of awareness of general practitioners. Local treatment includes the Patey-Dyson mastectomy and radiation therapy. Adjuvant systemic therapy is determined by pTNM and typically involves tamoxifen.
MeSH term(s)	Adult ; Aged ; Alcohol Drinking/adverse effects ; Antineoplastic Agents, Hormonal/therapeutic use ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use ; Biomarkers, Tumor/analysis ; Breast Neoplasms, Male/chemistry ; Breast Neoplasms, Male/diagnosis ; Breast Neoplasms, Male/diagnostic imaging ; Breast Neoplasms, Male/genetics ; Breast Neoplasms, Male/pathology ; Breast Neoplasms, Male/therapy ; Chemotherapy, Adjuvant ; Disease Progression ; Early Detection of Cancer ; Genes, BRCA1 ; Genes, BRCA2 ; Humans ; Klinefelter Syndrome/complications ; Liver Diseases/complications ; Male ; Mammography ; Mastectomy, Modified Radical ; Middle Aged ; Mutation ; Neoplasm Staging ; Obesity/complications ; Palpation ; Radiotherapy, Adjuvant ; Receptors, Estrogen/analysis ; Risk Factors ; Tamoxifen/therapeutic use ; Ultrasonography, Mammary
Chemical Substances	Antineoplastic Agents, Hormonal ; Biomarkers, Tumor ; Receptors, Estrogen ; Tamoxifen (094ZI81Y45)
Language	Russian
Publishing date	2013
Publishing country	Russia (Federation)
Document type	Journal Article
ZDB-ID	955397-6
ISSN	0507-3758
ISSN	0507-3758
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Article ; Online: Influence of Himasthla elongata (Trematoda: Echinostomatidae) metacercariae on heart rate in blue mussels (Mytilus edulis).

Bakhmet, Igor / Nikolaev, Kirill / Levakin, Ivan / Ekimov, Dmitry

Journal of invertebrate pathology

2019 Volume 166, Page(s) 107220

Abstract: Whether metacercariae of the digenean Himasthla elongata (Himasthlidae) are harmful to their secondary intermediate hosts, the blue mussel, Mytilus edulis, is a disputable question. To shed light on this issue, we performed field monitoring of the heart ... ...

Abstract	Whether metacercariae of the digenean Himasthla elongata (Himasthlidae) are harmful to their secondary intermediate hosts, the blue mussel, Mytilus edulis, is a disputable question. To shed light on this issue, we performed field monitoring of the heart rate (HR) in mussels infected with H. elongata over a period of 1.5 years. We observed a significant rise in HR in infected mussels, but only 1 year after infection and at temperatures of 15-17 °C. HR variance also grew sharply in infected mussels within the same temperature range. We also detected a decreased ability of infected mussels to compensate for the rise in the environment temperature. Finally, growth rate in the infected mussels was slower compared to the control group. We provide evidence for measurable pathogenic effects caused by H. elongata metacercariae in their secondary intermediate mussel hosts.
MeSH term(s)	Animals ; Echinostomatidae ; Heart Rate/physiology ; Mytilus edulis/parasitology ; Trematode Infections/veterinary
Language	English
Publishing date	2019-08-06
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	390885-9
ISSN	1096-0805 ; 0022-2011
ISSN (online)	1096-0805
ISSN	0022-2011
DOI	10.1016/j.jip.2019.107220
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Article: [Surfactant proteins A and D: role in the pathogenesis of community-acquired pneumonia and possible predictive perspectives].

Kharlamovа, O S / Nikolaev, K Y / Ragino, Y I / Voevoda, M I

Terapevticheskii arkhiv

2020 Volume 92, Issue 3, Page(s) 109–115

Abstract: Community-acquired pneumonia is one of the most common infectious diseases and remains one of the leading causes of death in this group of diseases. Studies of community-acquired pneumonia are extremely relevant for modern clinical practice. One of the ... ...

Abstract	Community-acquired pneumonia is one of the most common infectious diseases and remains one of the leading causes of death in this group of diseases. Studies of community-acquired pneumonia are extremely relevant for modern clinical practice. One of the important role in the pathogenesis of bacterial, viral, fungal invasion in the system of a human lung system belongs to the pulmonary surfactant, in particular, its proteins SP-A and SP-D. This article reviews the well-known mechanisms of important biological properties of immunomodulatory activity of the proteins SP-A and SP-D in response to microbial infection in the lungs. The mechanisms of participation of surfactant proteins SP-A and SP-D in the cascade of reactions that lead to severe life-threatening complications in community-acquired pneumonia are considered. The use of serum levels of surfactant proteins SP-A and SP-D can help finding new diagnostic and prognostic approaches in patients with community-acquired pneumonia.
MeSH term(s)	Community-Acquired Infections ; Humans ; Pneumonia ; Pulmonary Surfactant-Associated Protein A ; Pulmonary Surfactant-Associated Protein D ; Surface-Active Agents
Chemical Substances	Pulmonary Surfactant-Associated Protein A ; Pulmonary Surfactant-Associated Protein D ; Surface-Active Agents
Language	Russian
Publishing date	2020-04-27
Publishing country	Russia (Federation)
Document type	Journal Article ; Review
ZDB-ID	40718-5
ISSN	2309-5342 ; 0040-3660
ISSN (online)	2309-5342
ISSN	0040-3660
DOI	10.26442/00403660.2020.03.000275
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Article: Khirurgicheskie oslozhneniya u bol'nykh COVID-19.

Ivchenko, D R / Kovalev, A S / Akimov, A V / Nikolaev, K N / Yudenkov, S N / Emelyanov, I N / Golubov, E A / Chevychelov, S V

Khirurgiia

2022 , Issue 8, Page(s) 69–74

Abstract: Objective: To analyze in-hospital perioperative complications in COVID-19 patients.: Material and methods: We analyzed medical records of 1.250 patients with COVID-19 for the period from April 2020 to December 2021. Mean age of patients was 62.8±2.1 ... ...

Title translation	Surgical complications in patients with COVID-19.
Abstract	Objective: To analyze in-hospital perioperative complications in COVID-19 patients. Material and methods: We analyzed medical records of 1.250 patients with COVID-19 for the period from April 2020 to December 2021. Mean age of patients was 62.8±2.1 years, length of hospital-stay - 44.3±3.7 days. All patients received therapy in accordance with the national guidelines on prevention, diagnosis and treatment of new coronavirus infection (COVID-19)» (versions 1-12). Visualization of hematomas, arterial and venous thrombosis was performed using ultrasound, CT and CT angiography. Results: Mortality rate was 1.5%. Surgical complications included various hematomas, arterial and venous thrombosis of great vessels. Hematomas were detected in 15 (1.2%) patients, 2 of them died. There were hematomas of extremities in 5 cases, retroperitoneal space - 4, soft tissues of the body - 4, internal organs (spleen) -2 patients. The volume of hematoma was up to 100 ml in 6 patients, 100-500 ml in 5 patients, 500-1000 ml in 3 patietns, more than 1000 ml in 1 patient. Hematomas occurred in 23.1±1.1 days after laboratory verification of COVID-19. Four (26.7%) patients underwent emergency surgery. Conservative therapy was followed by lysis of hematoma after 25.1±2.7 days. Venous thrombosis without signs of flotation occurred in 20 (1.6%) patients, arterial thrombosis - in 3 (0.24%) patients (2 ones required surgery). Conclusion: Management of COVID-19 patients with various hematomas should be as conservative as possible. Arterial thrombosis and extensive spleen hematomas requiring surgical treatment are features of COVID-19.
MeSH term(s)	COVID-19/complications ; Hematoma/diagnosis ; Hematoma/etiology ; Hematoma/therapy ; Humans ; Middle Aged ; Retroperitoneal Space ; Retrospective Studies ; Thrombosis/complications ; Venous Thrombosis/diagnosis ; Venous Thrombosis/etiology ; Venous Thrombosis/therapy
Language	Russian
Publishing date	2022-08-03
Publishing country	Russia (Federation)
Document type	Journal Article
ZDB-ID	419230-8
ISSN	2309-5628 ; 0023-1207
ISSN (online)	2309-5628
ISSN	0023-1207
DOI	10.17116/hirurgia202208169
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Article: The Impact of Hypoglycemic Therapy on the Prognosis for Acute Coronary Syndrome in Patients with Type 2 Diabetes.

Nikolaev, K Yu / Shevela, A I / Mustafina, S V / Rymar, O D / Ovsyannikova, A K / Zelenskaya, E M / Kovaleva, A Y / Lifshits, G I

Journal of personalized medicine

2022 Volume 12, Issue 5

Abstract: The article discusses particular circumstances of acute coronary syndrome (ACS) in patients with type 2 diabetes (T2D). In addition, the available literature data and clinical guidelines reflecting the role of hypoglycemic therapy as a cardioprotection ... ...

Abstract	The article discusses particular circumstances of acute coronary syndrome (ACS) in patients with type 2 diabetes (T2D). In addition, the available literature data and clinical guidelines reflecting the role of hypoglycemic therapy as a cardioprotection factor in ACS are analyzed. The article considers possible protective molecular mechanisms of various groups of drugs in ischemic cardiomyocytes.
Language	English
Publishing date	2022-05-22
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2662248-8
ISSN	2075-4426
ISSN	2075-4426
DOI	10.3390/jpm12050845
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Article: Horseradish Peroxidase-Based Biosensors with Different Nanotransducers for the Determination of Hydrogen Peroxide

Nikolaev, K. G / Ermakov, S. S / Ermolenko, Yu. E / Navolotskaya, D. V / Offenhäusser, A / Mourzina, Yu. G

Journal of analytical chemistry. 2021 Apr., v. 76, no. 4

2021

Abstract: We studied methods of the in situ synthesis of gold nanostructures on the electrode surface and of the directed electrochemical synthesis of nanodendrites to create biosensors based on horseradish peroxidase. The effect of nanostructuring of the ... ...

Abstract	We studied methods of the in situ synthesis of gold nanostructures on the electrode surface and of the directed electrochemical synthesis of nanodendrites to create biosensors based on horseradish peroxidase. The effect of nanostructuring of the transducer surface and its subsequent modification on the electroanalytical characteristics of sensors for the determination of hydrogen peroxide was studied. The use of these methods can significantly improve the performance characteristics of the biosensors, such as the sensitivity coefficient, limit of detection, and stability in the range of micromolar and submicromolar concentrations of hydrogen peroxide. The electrodes modified by the in situ synthesis of nanostructures with subsequent treatment with Meerwein’s reagent, as well as ultramicroelectrodes prepared by directional electrochemical synthesis, show low limits of detection for hydrogen peroxide, 0.2 and 0.08 µM, and high sensitivity coefficients, 0.71 and 0.84 A M–¹ cm–², respectively.
Keywords	analytical chemistry ; biosensors ; detection limit ; electrodes ; electrosynthesis ; gold ; horseradish ; hydrogen peroxide ; peroxidase
Language	English
Dates of publication	2021-04
Size	p. 510-517.
Publishing place	Pleiades Publishing
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2057336-4
ISSN	1608-3199 ; 1061-9348
ISSN (online)	1608-3199
ISSN	1061-9348
DOI	10.1134/S1061934821040080
Database	NAL-Catalogue (AGRICOLA)

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