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Article ; Online: OAM-mode coupling by segmented helical-ring-core waveguides inscribed with a femtosecond laser beam.

Likhov, Vladislav / Vasiliev, Sergei / Alagashev, Grigory / Okhrimchuk, Andrey

Optics letters

2024 Volume 49, Issue 5, Page(s) 1217–1220

Abstract: Azimuthally segmented helical-ring-core waveguides (HRCWs) were fabricated in silica glass by direct laser writing. Triple-segmented waveguides provided single-mode or few-mode light guidance depending on the core diameter. Bragg resonance reflection of ... ...

Abstract	Azimuthally segmented helical-ring-core waveguides (HRCWs) were fabricated in silica glass by direct laser writing. Triple-segmented waveguides provided single-mode or few-mode light guidance depending on the core diameter. Bragg resonance reflection of the light carrying orbital angular momentum (OAM) was registered confirming the generalized angular phase-matching condition, which considers the azimuthally segmented structure of the waveguides.
Language	English
Publishing date	2024-03-01
Publishing country	United States
Document type	Journal Article
ISSN	1539-4794
ISSN (online)	1539-4794
DOI	10.1364/OL.515710
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Article: Pervichnaya vnutrikostnaya kavernoznaya gemangioma kostei cherepa: obzor literatury i opisanie klinicheskogo nablyudeniya khirurgicheskogo lecheniya.

Nenashev, E A / Vasiliev, S A / Vandaeva, E V / Levin, R S

Khirurgiia

2023 , Issue 11, Page(s) 113–117

Abstract: Primary intraosseous cavernous hemangioma (PICH) is a rare benign vascular tumor. This neoplasm is common in the spine and less common in skull. Toynbee J. first described this tumor in 1845. PICH of the cranium does not always have typical X-ray ... ...

Title translation	Primary intraosseous cavernous hemangioma of the cranium: a case report.
Abstract	Primary intraosseous cavernous hemangioma (PICH) is a rare benign vascular tumor. This neoplasm is common in the spine and less common in skull. Toynbee J. first described this tumor in 1845. PICH of the cranium does not always have typical X-ray features and should be always differentiated with other more common skull lesions. Surgical resection is preferable since total resection is followed by favorable prognosis. We present a 65-year-old patient with asymptomatic tumor of the right parietal bone. CT revealed osteolytic lesion that required total resection and skull repair. Histopathological analysis revealed intraosseous cavernous hemangioma.
MeSH term(s)	Humans ; Aged ; Skull Neoplasms/diagnosis ; Skull Neoplasms/surgery ; Skull Neoplasms/pathology ; Vascular Neoplasms ; Skull ; Hemangioma, Cavernous/diagnostic imaging ; Hemangioma, Cavernous/surgery
Language	Russian
Publishing date	2023-11-27
Publishing country	Russia (Federation)
Document type	Case Reports ; English Abstract ; Journal Article
ZDB-ID	419230-8
ISSN	2309-5628 ; 0023-1207
ISSN (online)	2309-5628
ISSN	0023-1207
DOI	10.17116/hirurgia2023111113
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Article ; Online: Purely Spatial Quantum Diffusion of H Atoms in Solid H_{2} at Temperatures below 1 K.

Sheludiakov, S / Lee, D M / Khmelenko, V V / Järvinen, J / Ahokas, J / Vasiliev, S

Physical review letters

2021 Volume 126, Issue 19, Page(s) 195301

Abstract: We report on a direct measurement of the quantum diffusion of H atoms in solid molecular hydrogen films at T=0.7 K. We obtained a rate of pure spatial diffusion of H atoms in the H_{2} films, D^{d}=5(2)×10^{-17} cm^{2} s^{-1}, which was 2 orders of ... ...

Abstract	We report on a direct measurement of the quantum diffusion of H atoms in solid molecular hydrogen films at T=0.7 K. We obtained a rate of pure spatial diffusion of H atoms in the H_{2} films, D^{d}=5(2)×10^{-17} cm^{2} s^{-1}, which was 2 orders of magnitude faster than that obtained from H atom recombination, the quantity used in all previous work to characterize the mobility of H atoms in solid H_{2}. We also observed that the H-atom diffusion was significantly enhanced by injection of phonons. Our results provide the first measurement of the pure spatial diffusion rate for H atoms in solid H_{2}, the only solid state system beside ^{3}He-^{4}He mixtures, where atomic diffusion does not vanish even at temperatures below 1 K.
Language	English
Publishing date	2021-05-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.195301
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Article ; Online: Experimental cell with a Fabry-Pérot resonator tuned in situ for magnetic resonance studies of matrix-isolated radicals at temperatures below 1 K.

Sheludiakov, S / Lee, D M / Khmelenko, V V / Järvinen, J / Ahokas, J / Vasiliev, S

The Review of scientific instruments

2020 Volume 91, Issue 6, Page(s) 63901

Abstract: We describe the design and construction of an experimental cell for the study of free radicals in macroscopically thick films of solidified molecular and rare gases by 128 GHz Electron Spin Resonance (ESR) at temperatures below 1 K. The ESR resonator has ...

Abstract	We describe the design and construction of an experimental cell for the study of free radicals in macroscopically thick films of solidified molecular and rare gases by 128 GHz Electron Spin Resonance (ESR) at temperatures below 1 K. The ESR resonator has an open Fabry-Pérot design, and its frequency can be tuned in situ by adjusting the spacing between the mirrors. The tuning mechanism consists of a piezo positioner and a stainless-steel edge-welded bellows, which can change the resonator frequency by at least 6 GHz. The films of solidified gases can be deposited either directly from a room temperature reservoir or by recondensing from a specially arranged chamber. The free radicals can be created in the solid films by dissociating matrix species by running an rf discharge in a helium vapor. We suggest that such a sample cell design can also be used for a broad range of low-temperature ESR experiments where sample cooling needs to be enhanced by the presence of superfluid helium.
Language	English
Publishing date	2020-06-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/5.0012178
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Article: Khirurgiya spinal'nykh opukholei s ispol'zovaniem intraoperatsionnogo ul'trazvukovogo issledovaniya.

Levin, R S / Vasiliev, S A / Aslanukov, M N / Zuev, A A / Oshchepkov, S K

Zhurnal voprosy neirokhirurgii imeni N. N. Burdenko

2022 Volume 86, Issue 1, Page(s) 56–65

Abstract: Objective: To improve technique of intraoperative ultrasound-assisted microsurgery of spinal tumors.: Material and methods: There were 68 patients with 70 spinal tumors who underwent intraoperative ultrasound-assisted resection between 2007 and 2018. ...

Title translation	Intraoperative ultrasound-assisted surgery of spinal tumors.
Abstract	Objective: To improve technique of intraoperative ultrasound-assisted microsurgery of spinal tumors. Material and methods: There were 68 patients with 70 spinal tumors who underwent intraoperative ultrasound-assisted resection between 2007 and 2018. Age of patients varied from 21 to 80 (mean 48.5±14.3). Intradural tumors were diagnosed in 54 (79.4%) patients (of them intramedullary in 16 (23.5%) and extramedullary in 38 (55.9%) cases). Fourteen patients (20.6%) had extradural tumors. Intraoperative ultrasound was used to determine localization, margins and structure of tumors, interrelations with neural structures, zones of dura opening and myelotomy. We also assessed quality of resection and spinal decompression. Results: In surgery of spinal tumors, intraoperative ultrasound allows to localize the tumor with 95.3% sensitivity, determine the character of its growth, shape, size and internal structure. One can also differentiate the margins of neoplasm, control accuracy of approach, select the optimal zone for dura opening and myelotomy, objectively assess spinal cord and nerve roots decompression in real-time mode. Quality of intraoperative ultrasonography images is comparable to preoperative MRI, and even exceed resolution of MR scans in some cases. Conclusion: In our study, intraoperative ultrasound has proven to be a method complementing preoperative CT and MRI. This approach provides additional data in real-time mode to form a complete picture of surgical area, increase accuracy of manipulations and reduce surgical trauma.
MeSH term(s)	Dura Mater ; Humans ; Neurosurgical Procedures ; Spinal Cord ; Spinal Cord Neoplasms/diagnostic imaging ; Spinal Cord Neoplasms/surgery ; Spinal Neoplasms/surgery ; Ultrasonography
Language	Russian
Publishing date	2022-02-15
Publishing country	Russia (Federation)
Document type	Journal Article
ZDB-ID	603458-5
ISSN	0042-8817
ISSN	0042-8817
DOI	10.17116/neiro20228601156
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Article: Morphological Differentiation of Equids (Equus ovodovi, Equus hemionus) and Their Distribution Ranges in Western Siberia in the Late Pleistocene

Plasteeva, N. A. / Vasiliev, S. K. / Klementiev, A. M. / Kosintsev, P. A.

Biology bulletin of the Russian Academy of Sciences. 2021 Dec., v. 48, no. Supplement 1

2021

Abstract: This paper presents the results of a morphological study for distinguishing the remains of two small equid species that inhabited the south of Western Siberia in the Late Pleistocene: the Ovodov horse (Equus ovodovi Eisenmann et Vasiliev) and the Asiatic ...

Abstract	This paper presents the results of a morphological study for distinguishing the remains of two small equid species that inhabited the south of Western Siberia in the Late Pleistocene: the Ovodov horse (Equus ovodovi Eisenmann et Vasiliev) and the Asiatic wild ass (E. hemionus Pallas). A detailed analysis of metric and nonmetric characters of equid limb bones shows that only metric features can be used for species discrimination. The Asiatic wild ass had smaller and more gracile limb bones than the Ovodov horse. The examination of new fossil remains from Western Siberia suggests that the distribution ranges of the Asiatic wild ass and the Ovodov horse did not overlap in the past. The Ovodov horse inhabited the southeastern part of the study area, from the Ob Plateau to the Altai Mountains and Kuznetsk Alatau. The remains of the Asiatic wild ass were found only in the southwest and southeast of Western Siberia, thus indicating a restricted distribution of this species in the area during the Late Pleistocene.
Keywords	Equus hemionus ; Pleistocene epoch ; Siberia ; fossils ; horses
Language	English
Dates of publication	2021-12
Size	p. S197-S207.
Publishing place	Pleiades Publishing
Document type	Article
ZDB-ID	1161709-3
ISSN	1062-3590
ISSN	1062-3590
DOI	10.1134/S1062359021140132
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A large octupole magnetic trap for research with atomic hydrogen.

Ahokas, J / Semakin, A / Järvinen, J / Hanski, O / Laptiyenko, A / Dvornichenko, V / Salonen, K / Burkley, Z / Crivelli, P / Golovizin, A / Nesvizhevsky, V / Nez, F / Yzombard, P / Widmann, E / Vasiliev, S

The Review of scientific instruments

2022 Volume 93, Issue 2, Page(s) 23201

Abstract: We describe the design and performance of a large magnetic trap for storage and cooling of atomic hydrogen (H). The trap operates in the vacuum space of a dilution refrigerator at a temperature of 1.5 K. Aiming at a large volume of the trap, we ... ...

Abstract	We describe the design and performance of a large magnetic trap for storage and cooling of atomic hydrogen (H). The trap operates in the vacuum space of a dilution refrigerator at a temperature of 1.5 K. Aiming at a large volume of the trap, we implemented the octupole configuration of linear currents (Ioffe bars) for the radial confinement, combined with two axial pinch coils and a 3 T solenoid for the cryogenic H dissociator. The octupole magnet consists of eight race-track segments, which are compressed toward each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement or repair of each segment. A maximum trap depth of 0.54 K (0.8 T) was reached, corresponding to an effective volume of 0.5 l for hydrogen gas at 50 mK. This is an order of magnitude larger than ever used for trapping atoms.
Language	English
Publishing date	2022-03-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/5.0070037
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Article: Diagnostics of thrombocytopenias.

Mazurov, A V / Khaspekova, S G / Vasiliev, S A

Terapevticheskii arkhiv

2019 Volume 90, Issue 7, Page(s) 4–13

Abstract: Laboratory methods used for the diagnostics of thrombocytopenias are reviewed. Differential diagnosis is usually carried out between immune and hypoproductive forms of thrombocytopenia. Immune thrombocytopenias are caused by appearance in blood of ... ...

Abstract	Laboratory methods used for the diagnostics of thrombocytopenias are reviewed. Differential diagnosis is usually carried out between immune and hypoproductive forms of thrombocytopenia. Immune thrombocytopenias are caused by appearance in blood of antiplatelet abtibodies and accelerated destruction of platelets sensibilized by those antibodies, and hypoproductive thrombocytopenias - by impaired platelet production in the bone marrow. Main directions of the laboratory diagnostics of thrombocytopenias - analysis of auto- and alloautoantibodies and evaluation of platelet production and turnover in the blood stream. The following methods are used for the investigation of antiplatelet antibodies: 1) measurement of platelet associated immunoglobulins; 2) determination of circulating antibodies reacting with platelets; 3) determination of antibodies using antigen specific methods - by their reactivity with isolated platelet antigens (glycoproteins). Efficacy of platelet production could be assessed by measuring in blood the amount of "young" (reticulated) platelets. One more method for the evaluation of platelet production as well as the rate of platelet turnover - measurement of plasma soluble glycocalicin, glycoprotein Ib fragment shed from the surface of platelets upon their destruction in spleen and liver. In patients with immune thrombocytopenia autoantibodies are evaluated in all cases, the percentage of reticulated platelets is significantly increased and the amount of plasma glycocalicin is within the normal range or increased. In patients with hypoproductive thrombocytopenia autoantibodies are not detected or detected at low level, the percentage of reticulated platelets is within the normal range or slightly increased and the amount of plasma glycocalicin is lowered. Diagnostics of hapten forms of immune thromocytopenias (heparin-induced thrombocytopenia and others) and of alloimmune thrombocytopenias (neonatal alloimmune thrombocytopenia in particular) are considered in the separate sections of this review.
MeSH term(s)	Antigens, Human Platelet/blood ; Antigens, Human Platelet/immunology ; Autoantibodies/blood ; Blood Platelets/cytology ; Blood Platelets/immunology ; Diagnosis, Differential ; Humans ; Platelet Count ; Purpura, Thrombocytopenic, Idiopathic/blood ; Thrombocytopenia/blood
Chemical Substances	Antigens, Human Platelet ; Autoantibodies
Language	English
Publishing date	2019-01-30
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/terarkh20189074-13
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Article ; Online: Dynamic nuclear polarization and ESR hole burning in As doped silicon.

Järvinen, J / Zvezdov, D / Ahokas, J / Sheludiakov, S / Lehtonen, L / Vasiliev, S / Vlasenko, L / Ishikawa, Y / Fujii, Y

Physical chemistry chemical physics : PCCP

2020 Volume 22, Issue 18, Page(s) 10227–10237

Abstract: We present an experimental study of the Dynamic Nuclear Polarization (DNP) ... ...

Abstract	We present an experimental study of the Dynamic Nuclear Polarization (DNP) of
Language	English
Publishing date	2020-04-30
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/c9cp06859g
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Article ; Online: Formation of Nuclear-Polarized Phases of H Atoms Embedded in Solid H_{2} Films.

Sheludiakov, S / McColgan, P T / Lee, D M / Khmelenko, V V / Järvinen, J / Ahokas, J / Vasiliev, S

Physical review letters

2019 Volume 122, Issue 22, Page(s) 225301

Abstract: We report on an experimental observation of two phases of hydrogen atoms in solid H_{2} films at temperatures of 0.1-0.8 K, characterized by a large enhancement of the nuclear spin polarization compared to that given by Boltzmann statistics (p=0.15 at T= ... ...

Abstract	We report on an experimental observation of two phases of hydrogen atoms in solid H_{2} films at temperatures of 0.1-0.8 K, characterized by a large enhancement of the nuclear spin polarization compared to that given by Boltzmann statistics (p=0.15 at T=0.15 K). The first phase with p=0.35(5) is formed spontaneously during sample storage in a high magnetic field (B=4.6 T). The second phase with an even higher nuclear polarization, p=0.75(7), can be achieved at T≤0.55 K by repeating sequences of dynamic nuclear polarization followed by a system relaxation. Upon warming through the range 0.55-0.65 K, the highly nuclear-polarized phase undergoes a phase transition to the spontaneously polarized phase which breaks down at T≃0.8 K, and the nuclear polarization gradually converges to the Boltzmann distribution. We discuss possible scenarios for explaining the nature of the observed phenomena.
Language	English
Publishing date	2019-07-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.122.225301
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