268 results on '"O. Kiselev"'
Search Results
2. First measurement of isoscalar giant resonances in a stored-beam experiment
- Author
-
J.C. Zamora, T. Aumann, S. Bagchi, S. Bönig, M. Csatlós, I. Dillmann, C. Dimopoulou, P. Egelhof, V. Eremin, T. Furuno, H. Geissel, R. Gernhäuser, M.N. Harakeh, A.-L. Hartig, S. Ilieva, N. Kalantar-Nayestanaki, O. Kiselev, H. Kollmus, C. Kozhuharov, A. Krasznahorkay, Th. Kröll, M. Kuilman, S. Litvinov, Yu.A. Litvinov, M. Mahjour-Shafiei, M. Mutterer, D. Nagae, M.A. Najafi, C. Nociforo, F. Nolden, U. Popp, C. Rigollet, S. Roy, C. Scheidenberger, M. von Schmid, M. Steck, B. Streicher, L. Stuhl, M. Thürauf, T. Uesaka, H. Weick, J.S. Winfield, D. Winters, P.J. Woods, T. Yamaguchi, K. Yue, and J. Zenihiro
- Subjects
Physics ,QC1-999 - Abstract
A new technique developed for measuring nuclear reactions at low momentum transfer with stored beams in inverse kinematics was successfully used to study isoscalar giant resonances. The experiment was carried out at the experimental heavy-ion storage ring (ESR) at the GSI facility using a stored 58Ni beam at 100 MeV/u and an internal helium gas-jet target. In these measurements, inelastically scattered α-recoils at very forward center-of-mass angles (θcm≤1.5°) were detected with a dedicated setup, including ultra-high vacuum compatible detectors. Experimental results indicate a dominant contribution of the isoscalar giant monopole resonance at this very forward angular range. It was found that the monopole contribution exhausts 79−11+12% of the energy-weighted sum rule (EWSR), which agrees with measurements performed in normal kinematics. This opens up the opportunity to investigate the giant resonances in a large domain of unstable and exotic nuclei in the near future. It is a fundamental milestone towards new nuclear reaction studies with stored ion beams. Keywords: Storage ring, Inverse kinematics, Isoscalar giant resonances
- Published
- 2016
- Full Text
- View/download PDF
3. Quasi-free proton knockout from 12C on carbon target at 398 MeV/u
- Author
-
V. Panin, M. Holl, J.T. Taylor, Y. Aksyutina, H. Alvarez-Pol, T. Aumann, C.A. Bertulani, K. Boretzky, C. Caesar, M. Chartier, L.V. Chulkov, D. Cortina-Gil, J. Enders, O. Ershova, H. Geissel, R. Gernhäuser, M. Heil, H.T. Johansson, B. Jonson, A. Kelić-Heil, O. Kiselev, C. Langer, T. Le Bleis, R. Lemmon, T. Nilsson, S. Paschalis, M. Petri, R. Plag, R. Reifarth, D. Rossi, H. Scheit, H. Simon, F. Wamers, H. Weick, and C. Wimmer
- Subjects
Physics ,QC1-999 - Abstract
The proton-removal mechanism of the 12C→11B reaction induced on a carbon target via elementary nucleon-nucleon scattering is investigated in exclusive triple-coincidence measurements. The observed two-nucleon angular correlations are found to be consistent with quasi-free scattering of a projectile-like proton off a target-like nucleon. Exclusive cross sections for one-step pp and pn interactions are determined as σpp=17.2(12) mb and σpn=18.2(18), respectively. The extracted quasi-free component amounts up to 58(4)% of the total proton-removal cross section. The results are compared to total proton-removal cross sections obtained from the experiment and eikonal reaction theory. Keywords: Direct nuclear reactions, One-nucleon removal, Quasi-free scattering, Cross sections
- Published
- 2019
- Full Text
- View/download PDF
4. HCl and ClO in activated Arctic air; first retrieved vertical profiles from TELIS submillimetre limb spectra
- Author
-
A. de Lange, M. Birk, G. de Lange, F. Friedl-Vallon, O. Kiselev, V. Koshelets, G. Maucher, H. Oelhaf, A. Selig, P. Vogt, G. Wagner, and J. Landgraf
- Subjects
Environmental engineering ,TA170-171 ,Earthwork. Foundations ,TA715-787 - Abstract
The first profile retrieval results of the Terahertz and submillimeter Limb Sounder (TELIS) balloon instrument are presented. The spectra are recorded during a 13-h balloon flight on 24 January 2010 from Kiruna, Sweden. The TELIS instrument was mounted on the MIPAS-B2 gondola and shared this platform with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) and the mini-Differential Optical Absorption Spectroscopy (mini-DOAS) instruments. The flight took place within the Arctic vortex at an altitude of ≈34 km in chlorine activated air, and both active (ClO) and inactive chlorine (HCl) were measured over an altitude range of respectively ≈16–32 km and ≈10–32 km. In this altitude range, the increase of ClO concentration levels during sunrise has been recorded with a temporal resolution of one minute. During the daytime equilibrium, a maximum ClO level of 2.1 ± 0.3 ppbv has been observed at an altitude of 23.5 km. This equilibrium profile is validated against the ClO profile by the satellite instrument Microwave Limb Sounder (MLS) aboard EOS Aura. HCl profiles have been determined from two different isotopes – H35Cl and H37Cl – and are also validated against MLS. The precision of all profiles is well below 0.01 ppbv and the overall accuracy is therefore governed by systematic effects. The total uncertainty of these effects is estimated to be maximal 0.3 ppbv for ClO around its peak value at 23.5 km during the daytime equilibrium, and for HCl it ranges from 0.05 to 0.4 ppbv, depending on altitude. In both cases the main uncertainty stems from a largely unknown non-linear response in the detector.
- Published
- 2012
- Full Text
- View/download PDF
5. Experimentation and Rated Approach to Estimation Zone of Stable Inhomogeneity of the Magnetic Field in Magnetometer with the Pole Pieces-hemispheres.
- Author
-
Anna A. Sandulyak, Daria A. Sandulyak, Marina V. Shitikova, Alexander V. Sandulyak, and Dmitriy O. Kiselev
- Published
- 2023
- Full Text
- View/download PDF
6. Game Equilibria and Transition Dynamics in a Dyad with Heterogeneous Agents.
- Author
-
A. O. Kiselev and N. I. Yurchenko
- Published
- 2021
- Full Text
- View/download PDF
7. Study of proton and deuteron pickup reactions (d,3He), (d,4He) with 8He and 10Be radioactive beams at ACCULINNA-2 fragment separator
- Author
-
E.Yu. Nikolskii, I.A. Muzalevskii, S.A. Krupko, A.A. Bezbakh, V. Chudoba, S.G. Belogurov, D. Biare, A.S. Fomichev, E.M. Gazeeva, A.V. Gorshkov, L.V. Grigorenko, G. Kaminski, M. Khirk, O. Kiselev, D.A. Kostyleva, M.Yu. Kozlov, B. Mauyey, I. Mukha, Yu.L. Parfenova, A.M. Quynh, V.N. Schetinin, A. Serikov, S.I. Sidorchuk, P.G. Sharov, R.S. Slepnev, S.V. Stepantsov, A. Swiercz, G.M. Ter-Akopian, R. Wolski, and M.V. Zhukov
- Subjects
Nuclear and High Energy Physics ,Instrumentation - Published
- 2023
8. The MEG detector for ${\mu}+\to e+{\gamma}$ decay search
- Author
-
Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Cerri, C., Corbo, M., Curalli, N., De Bari, A., De Gerone, M., Del Frate, L., Doke, S., Dussoni, S., Egger, J., Fratini, K., Fujii, Y., Galli, L., Galeotti, S., Gallucci, G., Gatti, F., Golden, B., Grassi, M., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hisamatsu, M. Hildebrandt Y., Ignatov, F., Iwamoto, T., Kaneko, D., Kasami, K., Kettle, P. -R., Khazin, B. I., Korenchenko, O. Kiselev A., Kravchuk, N., Lim, G., Maki, A., Mihara, S., Molzon, W., Mori, T., Morsani, F., Mzavia, D., Nardò, R., Natori, H., Nicolò, D., Nishiguchi, H., Ootani, Y. Nishimura W., Ozone, K., Panareo, M., Papa, A., Pazzi, R., Piredda, G., Popov, A., Raffaelli, F., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Sawada, R., Schneebeli, M., Sergiampietri, F., Signorelli, G., Suzuki, S., Tenchini, F., Topchyan, C., Uchiyama, Y., Voena, R. Valle C., Xiao, F., Yamada, S., Yamamoto, S., Yamashita, S., Yudin, Yu. V., and Zanello, D.
- Subjects
Physics - Instrumentation and Detectors ,High Energy Physics - Experiment - Abstract
The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\ by using one of the most intense continuous $\mu^+$ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus., Comment: 59 pages, 90 figures
- Published
- 2013
- Full Text
- View/download PDF
9. Classification of Edge Instabilities at Globus-M2 Tokamak
- Author
-
V. V. Solokha, G. S. Kurskiev, A. Yu. Yashin, I. M. Balachenkov, V. I. Varfolomeev, A. V. Voronin, V. K. Gusev, V. Yu. Goryainov, V. V. Dyachenko, N. S. Zhiltsov, E. O. Kiselev, V. B. Minaev, A. N. Novokhatsky, Yu. V. Petrov, A. M. Ponomarenko, N. V. Sakharov, A. Yu. Telnova, E. E. Tkachenko, V. A. Tokarev, S. Yu. Tolstyakov, E. A. Tukhmeneva, N. A. Khromov, and P. B. Shchegolev
- Subjects
Physics and Astronomy (miscellaneous) ,Condensed Matter Physics - Abstract
Abstract Among the peripheral instabilities observed at the Globus-M2 tokamak, two types of edge localized modes (ELMs) are brought into focus: ELMs synchronized and desynchronized with the sawtooth oscillations. The desynchronized ELMs appear in regimes that are characterized by high values of pressure in the pedestal, pped ≥ 3 kPa, and they are observed in discharges with the toroidal magnetic field BT > 0.6 T and plasma current IP > 0.3 MA. The desynchronized ELMs belong to the type-III/V with the dominating effect of the peeling mode. The synchronized ELMs were observed in a wider range of discharge parameters, including at BT < 0.6 T and IP < 0.3 MA. Calculations of the stability of the peeling-ballooning (PB) mode showed that at pedestal width ψnorm = 0.09 and pped > 3.5 kPa, destabilization of PB modes is possible without additional influence. Experimental data shows that the microtearing mode plays a dominant role in the pedestal. The microtearing mode does not allow the pedestal at Globus-M2 tokamak to reach the state of the unstable kinetic ballooning mode (KBM), which explains the low predictive power of the EPED model at this tokamak.
- Published
- 2023
10. Hot Ion Mode in the Globus-M2 Spherical Tokamak
- Author
-
G. S. Kurskiev, N. V. Sakharov, V. K. Gusev, V. B. Minaev, I. V. Miroshnikov, Yu. V. Petrov, A. Yu. Telnova, N. N. Bakharev, E. O. Kiselev, N. S. Zhiltsov, P. B. Shchegolev, I. M. Balachenkov, V. I. Varfolomeev, A. V. Voronin, V. Yu. Goryainov, V. V. Dyachenko, E. G. Zhilin, M. V. Iliasova, A. A. Kavin, A. N. Konovalov, S. V. Krikunov, K. M. Lobanov, A. D. Melnik, A. B. Mineev, A. N. Novokhatsky, M. I. Patrov, A. V. Petrov, A. M. Ponomarenko, O. M. Skrekel’, V. A. Solovei, V. V. Solokha, E. E. Tkachenko, V. A. Tokarev, S. Yu. Tolstyakov, E. A. Tukhmeneva, E. M. Khilkevitch, N. A. Khromov, F. V. Chernyshev, A. E. Shevelev, K. D. Shulyat’ev, and A. Yu. Yashin
- Subjects
Physics and Astronomy (miscellaneous) ,Condensed Matter Physics - Abstract
Abstract NBI-assisted plasma heating with one or two injectors of fast neutral atoms was studied at the Globus-M2 spherical tokamak at the toroidal magnetic fields of 0.8–0.9 T and plasma currents of 0.35–0.4 MA. Measurements of the spatial temperature and electron density distributions, performed using the Thomson scattering diagnostics, showed a twofold increase in heating of plasma electrons during the injection of neutral particles with energies of up to 45 keV at the beam power of 0.75 MW, as compared to the ohmic heating regime. Switching on the second additional beam with the particle energy of up to 30 keV and power of up to 0.5 MW resulted in obtaining the hot ion mode in the range of mean plasma densities of (1.6–10) × 1019 m−3. According to the data of active spectroscopy and neutral particle analyzer diagnostics, in the hot zone, the ion temperature reached 4 keV at the plasma density of 8 × 1019 m−3, which is more than 2.5 times higher than the electron temperature.
- Published
- 2023
11. Engineering-Physical Model (GLOBSYS) for the Next STEP of the Globus-M Spherical Tokamak Program: Verification of Some Subsystems on Achieved and Predictable Data from Installations NSTX, NSTX-U, MAST, MAST-U, and ST40
- Author
-
A. B. Mineev, E. N. Bondarchuk, A. A. Kavin, A. Yu. Konin, I. Yu. Rodin, V. N. Tanchuk, V. A. Trofimov, O. G. Filatov, N. N. Bakharev, N. S. Zhilzov, G. S. Kurskiev, E. O. Kiselev, V. B. Minaev, N. V. Sakharov, Yu. V. Petrov, and A. Yu. Telnova
- Subjects
Nuclear and High Energy Physics ,Atomic and Molecular Physics, and Optics - Published
- 2022
12. Application of Machine Learning to Determine Electron Temperature in Globus-M2 Tokamak Using the Soft X-Ray Emission Data and the Thomson Scattering Diagnostics Data
- Author
-
E. E. Tkachenko, G. S. Kurskiev, N. S. Zhiltsov, A. V. Voronin, V. Yu. Goryainov, E. E. Mukhin, S. Yu. Tolstyakov, V. I. Varfolomeev, V. K. Gusev, V. B. Minaev, A. N. Novokhatsky, M. I. Patrov, Yu. V. Petrov, N. V. Sakharov, E. O. Kiselev, and P. B. Shchegolev
- Subjects
Nuclear and High Energy Physics ,Atomic and Molecular Physics, and Optics - Published
- 2022
13. Parametric Studies of a Globus-3 Spherical Tokamak with Various Options of Electromagnetic Systems Based on Copper Alloys Using the GLOBSYS Code
- Author
-
A. B. Mineev, V. B. Minaev, N. V. Sakharov, N. N. Bakharev, E. N. Bondarchuk, A. A. Voronova, A. M. Glushaev, S. A. Grigoriev, V.K. Gusev, N. S. Zhiltsov, E. R. Zapretilina, A. A. Kavin, E. O. Kiselev, A. Yu. Konin, A. M. Kudriavtseva, G. S. Kurskiev, A. N. Labusov, Yu. V. Petrov, I. Yu. Rodin, V. N. Tanchuk, A. Yu. Tel’nova, V. A. Trofimov, and O. G. Filatov
- Subjects
Nuclear and High Energy Physics ,Atomic and Molecular Physics, and Optics - Published
- 2022
14. ГИПОКСИЧЕСКАЯ ПРОБА КАК МЕТОД ПРОГНОЗИРОВАНИЯ ГЕМОТРАНСФУЗИОННОЙ ТАКТИКИ И ХАРАКТЕРА ТЕЧЕНИЯ РАННЕГО ПОСЛЕОПЕРАЦИОННОГО ПЕРИОДА В КОРОНАРНОЙ ХИРУРГИИ
- Author
-
I. A. Mandel, V. O. Kiselev, Yu. K. Podoksenov, Yu. S. Svirko, and V. M. Shipulin
- Subjects
ГЕМОТРАНСФУЗИЯ ,НИЗКАЯ ФРАКЦИЯ ВЫБРОСА ЛЕВОГО ЖЕЛУДОЧКА ,ГИПОКСИЧЕСКАЯ ПРОБА ,ПОСЛЕОПЕРАЦИОННЫЕ ОСЛОЖНЕНИЯ ,HEMOTRANSFUSION ,Surgery ,RD1-811 - Abstract
The study focuses on the tactics of transfusion therapy during coronary artery bypass surgery with cardiopulmonary bypass in patients with left ventricular ejection fraction higher or lower than 40%. To predict the tactics of intraoperative transfusion therapy, hypoxic tests were preoperatively conducted in the main group of patients. A traditional approach to blood transfusion was applied in the control group of patients. The analysis of clinical and laboratory data, hemodynamics and oxygen balance, as well as follow-up data allowed to prove the possibility of decreasing allogenic blood use by 48.8% (p = 0,02). Based on the hypoxic test data, criteria for lowering the intraoperative trigger hemoglobin level down to 70 g/l, including the patients with a low left ventricular ejection fraction. It was shown that our tactics of trigger hemoglobin level calculation allows for reducing artificial lung ventilation time, frequency of gastrointestinal complications, multiple organ failure, as well as duration of stay at ICU.
- Published
- 2018
- Full Text
- View/download PDF
15. DEFINITION AND COMPARATIVE ANALYSIS OF THE GENOMIC STRUCTURE OF SIBERIAN STRAINS OF TICK-BORNE ENCEPHALITIS VIRUS OF THE EUROPEAN SUBTYPE
- Author
-
T. V. Demina, I. V. Kozlova, S. E. Tkachev, E. K. Doroshchenko, O. V. Lisak, Yu. S. Savinova, O. V. Suntsova, M. M. Verkhozina, Yu. P. Dzhioev, A. I. Paramonov, D. O. Kiselev, and V. I. Zlobin
- Subjects
tbe ,tbev ,genotype ,subtype ,genetic variability ,polyprotein ,amino acids substitutions ,Microbiology ,QR1-502 - Abstract
Tick-borne encephalitis virus (TBEV) is classified into three subtypes: Far Eastern (TBEV-FE), European (TBEV-EU) and Siberian (TBEV-SIB). In Russia, these are also called genotypes 1, 2 and 3, respectively. Geographically, TBEV-EU dominates in Central and Northern Europe, but its representatives are also found to the east - along the southern part of the forest zone of extratropical Eurasia - up to Eastern Siberia and South Korea. However, the strains isolated outside Europe remain poorly investigated. In the proposed study, eight full genomes of the Siberian isolates of TBEV-EU were determined and 13 complete genomes were compared. The analysis of 152 full-genome TBEV sequences showed that the TBEV-EU has a higher degree of stability of the genome-coding region in the entire Eurasian area (3.1% of differences) compared to TBEV-FE (6.6%) and TBEV-SIB (7.8%). At the same time, the maximum differences are observed not between European and Siberian strains, as one could expect, but between the representatives from Europe - TBEV strains Mandl-2009 from Norway and Hypr from the Czech Republic. The studied strains from Siberia form the compact genetic cluster of 42 TBEV-EU strains and are divided into two subclusters - West Siberian and East Siberian variants. These variants differ in the combinations of amino acid substitutions in all proteins except NS2B. The West Siberian variant mostly circulates in the territory of Altai, and the closest relative of its representatives is Absettarov strain from the European part of Russia. The strains similar to the East Siberian variant of the European subtype were recorded in the Altai (strain 84.2, 2007) and in Belarus (N256, about 1940).
- Published
- 2018
- Full Text
- View/download PDF
16. Impact of the method of internal opening closure of anal fistula on outcomes after laser fistula coagulation. Preliminary results of randomized clinical trial
- Author
-
A. V. Zakharyan, I. V. Kostarev, L. A. Blagodarny, A. Yu. Titov, A. A. Mudrov, D. O. Kiselev, and S. B. Kozyreva
- Subjects
Oncology ,Gastroenterology ,Surgery - Abstract
AIM: to estimate the outcomes after fistula laser coagulation for transsphincteric anal fistulas.PATIENTS AND METHODS: a prospective randomized single-center study included 42 patients with transsphincteric anal fistulas, 36 (85.7%) of them had a follow-up > 3 months. Nineteen patients were randomized to the group of laser thermocoagulation of the fistula track (diode laser 1560 nm) combined with ligation of intersphincteric fistula track (LC + LIFT). Seventeen patients were randomized to the group of laser thermocoagulation of the fistula combined with closure of internal fistula opening by advancement flap (LC + AF). Mean follow-up period was 6.5 months. Perioperatively (before surgery, 1 and 2 months after surgery), patients underwent ultrasound to assess fistula healing and early detection of recurrence.RESULTS: no intraoperative and early postoperative complications occurred. In the LC + LIFT group, healing rate was 89,5% (17/19 patients), in the LC + AF group — 64.7% (11/17patients). Endorectal ultrasound confirmed healing or early recurrence. No significant factors affecting recurrence rate were identified in both groups.CONCLUSION: treatment of transsphincteric anal fistulas by LC + LIFT showed better results compared with LC + AF technique. However, further recruitment of patients into study groups is required with evaluation of late results.
- Published
- 2022
17. Spectroscopic Diagnostic of the Peripheral Plasma in the Globus-M2 Tokamak with the Injection of Neutral Helium
- Author
-
V. M. Timokhin, V. Yu. Sergeev, E. A. Anufriev, D. D. Korobko, I. A. Sharov, V. I. Varfolomeev, A. N. Novokhatsky, N. N. Bakharev, E. O. Vekshina, K. V. Dolgova, N. S. Zhil’tsov, A. A. Kavin, V. G. Kapralov, E. O. Kiselev, A. N. Koval’, G. S. Kurskiev, K. M. Lobanov, V. B. Minaev, I. V. Miroshnikov, E. E. Mukhin, Yu. V. Petrov, V. A. Rozhansky, N. V. Sakharov, V. G. Skokov, A. Yu. Tel’nova, E. E. Tkachenko, V. A. Tokarev, S. Yu. Tolstyakov, E. A. Tyukhmeneva, and N. A. Khromov
- Subjects
Physics and Astronomy (miscellaneous) - Published
- 2022
18. Aerosol composition, air quality, and boundary layer dynamics in the urban background of Stuttgart in winter
- Author
-
H. Zhang, W. Huang, X. Shen, R. Ramisetty, J. Song, O. Kiseleva, C. C. Holst, B. Khan, T. Leisner, and H. Saathoff
- Subjects
Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Aerosol distributions are of great relevance for air quality, especially for cities like Stuttgart, which has limited air exchange due to its location in a basin. We collected a comprehensive set of data from remote sensing and in situ methods including radiosondes for the urban background of downtown Stuttgart to determine the impact of boundary layer mixing processes on local air quality and to evaluate the simulation results of the high-resolution large eddy simulation (LES) model PALM-4U at 10 m grid spacing. Stagnant meteorological conditions caused accumulation of aerosols, and chemical composition analysis shows that ammonium nitrate (37 ± 9 %) and organic aerosol (OA; 34 ± 9 %) dominated during this winter study. Case studies show that clouds during previous nights can weaken temperature inversion and accelerate boundary layer mixing after sunrise by up to 3 h. This is important for ground-level aerosol dilution during the morning rush hour. Furthermore, our observations validate results of the LES model PALM-4U in terms of boundary layer heights and aerosol mixing for 48 h. The simulated aerosol concentrations follow the trend of our observations but are still underestimated by a factor of 4.5 ± 2.1 due to missing secondary aerosol formation processes and uncertainties of emissions and boundary conditions in the model. This paper firstly evaluates the PALM-4U model performance in simulating aerosol spatio-temporal distributions, which can help to improve the LES model and to better understand sources and sinks for air pollution as well as the role of horizontal and vertical transport.
- Published
- 2024
- Full Text
- View/download PDF
19. Study of the Characteristics of EEG Frequency Patterns: the Automatic Marking of Sleep Stage without Additional Physiological Signals
- Author
-
Maksim O. Zhuravlev, Anton O. Kiselev, and Anastasia E. Runnova
- Published
- 2022
20. Magnetic Properties of Ferromagnetic Samples of Various Lengths, Approximation of the Demagnetizing Factor
- Author
-
M. N. Polismakova, D. O. Kiselev, Alexander V. Sandulyak, A. A. Sandulyak, D. A. Sandulyak, and R. Yu. Tkachenko
- Subjects
Magnetization ,Range (particle radiation) ,Materials science ,Condensed matter physics ,Ferromagnetism ,Permeability (electromagnetism) ,General Engineering ,General Materials Science ,Field strength ,equipment and supplies ,human activities ,Electromagnetic induction ,Exponential function - Abstract
Families of dependences of the parameters of magnetic induction, permeability, susceptibility, and magnetization for cylindrical steel samples on the field strength H and the ratio of their length to diameter L/D are obtained. It is shown that the dependences of these parameters on L/D reach self-similarity regions (thereby proving the correspondence to the magnetic properties of the material) at different H-dependent L/D values, in contrast to the existing opinion. It is also shown that the range of L/D samples used in practice is characterized by an exponential relationship between their demagnetizing factor and L/D.
- Published
- 2021
21. Evolution of treatment for rectal fistula: from resection to FiLaC® laser ablation
- Author
-
S. V. Pozdnyakov, D. O. Kiselev, A. O. Atroshchenko, D. L. Davidovich, and A. V. Teterin
- Subjects
Anal fistula ,medicine.medical_specialty ,business.industry ,Chronic persistent ,minimal‑invasive treatment of rectal fistulas ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,Disease ,rectal fistulas ,medicine.disease ,Surgery ,Clinical Practice ,03 medical and health sciences ,0302 clinical medicine ,fistula‑tract laser closure ,030220 oncology & carcinogenesis ,medicine ,030211 gastroenterology & hepatology ,business ,Surgical interventions ,RC254-282 ,Rectal fistula - Abstract
Rectal fistula – one of the most common coloproctological diseases. Annually, thousands of patients with anal fistula have had treated around the world. Treatment of this disease is an actual problem in coloproctology nowadays due to the high frequency of recurrence and anal incontinency. The chronic persistent perianal suppuration and multiple surgical interventions the main predictor of emergence of the anal incontinence, which could be achieve almost 50 %, according the literature data. The risk of emergence the anal incontinence is particularly high in the treatment of complex fistulas. Therefore, the problem of complex rectal fistulas treating remains an actual task in the clinical practice of a coloproctologist.
- Published
- 2021
22. First Results of the Ion Heat Transport Studies in the Globus-M2 Spherical Tokamak
- Author
-
A. Yu. Tel’nova, I. V. Miroshnikov, M. M. Mitrankova, N. N. Bakharev, V. K. Gusev, N. S. Zhil’tsov, E. O. Kiselev, G. S. Kurskiev, V. B. Minaev, Yu. V. Petrov, N. V. Sakharov, P. B. Shchegolev, and E. A. Tukhmeneva
- Subjects
Physics and Astronomy (miscellaneous) - Published
- 2021
23. H6 states studied in the H2(He8,He4) reaction and evidence of an extremely correlated character of the H5 ground state
- Author
-
E. Yu. Nikolskii, I. A. Muzalevskii, A. A. Bezbakh, V. Chudoba, S. A. Krupko, S. G. Belogurov, D. Biare, A. S. Fomichev, E. M. Gazeeva, A. V. Gorshkov, L. V. Grigorenko, G. Kaminski, M. Khirk, O. Kiselev, D. A. Kostyleva, M. Yu. Kozlov, B. Mauyey, I. Mukha, Yu. L. Parfenova, W. Piatek, A. M. Quynh, V. N. Schetinin, A. Serikov, S. I. Sidorchuk, P. G. Sharov, N. B. Shulgina, R. S. Slepnev, S. V. Stepantsov, A. Swiercz, P. Szymkiewicz, G. M. Ter-Akopian, R. Wolski, B. Zalewski, and M. V. Zhukov
- Published
- 2022
24. First Heat and Particles Transport Study in the Globus-M2 Spherical Tokamak with Neutral Beam Injection at the Current Ramp-Up
- Author
-
I V Miroshnikov, V. K. Gusev, M. I. Patrov, V. B. Minaev, N. A. Khromov, P. B. Shchegolev, I. M. Balachenkov, V. A. Tokarev, G. S. Kurskiev, N.S. Zhiltsov, E. O. Kiselev, N. N. Bakharev, A. A. Kavin, N. V. Sakharov, Yu. V. Petrov, K. D. Shulyat’ev, E. A. Tukhmeneva, A. Yu. Telnova, and S. Yu. Tolstyakov
- Subjects
010302 applied physics ,Tokamak ,Materials science ,Physics and Astronomy (miscellaneous) ,Thomson scattering ,Plasma ,Spherical tokamak ,Thermal diffusivity ,01 natural sciences ,Neutral beam injection ,010305 fluids & plasmas ,law.invention ,Physics::Plasma Physics ,law ,0103 physical sciences ,Heat transfer ,Electron temperature ,Atomic physics - Abstract
The article presents the results of studying the transfer of heat and particles in the Globus-M2 spherical tokamak in discharges with neutral injection at the current ramp up. An atomic beam was injected into the tokamak plasma at a fixed toroidal magnetic field of 0.7 T. The plasma current on the plateau was varied in the range 0.2–0.3 MA. Based on the electron temperature and concentration spatial distributions measured by the Thomson scattering method, the transport of heat and particles in plasma was simulated using the ASTRA code. The energy confinement time of the plasma was determined, as well as estimates of the coefficients of thermal diffusivity and diffusion was made.
- Published
- 2021
25. Calculating the Neutron Yield of the Globus-M2 Tokamak with Allowance for the Anisotropy of the Ion Velocity Distribution Function during Neutral Injection of High-Energy Atoms
- Author
-
E. O. Kiselev, V. K. Gusev, N. N. Bakharev, and O. M. Skrekel
- Subjects
010302 applied physics ,Physics ,Tokamak ,Physics and Astronomy (miscellaneous) ,02 engineering and technology ,Spherical tokamak ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Ion ,Computational physics ,Distribution function ,Deuterium ,law ,Neutron flux ,0103 physical sciences ,0210 nano-technology ,Anisotropy ,Legendre polynomials - Abstract
Two algorithms for calculating the neutron yield of the Globus-M2 tokamak are considered for the case of anisotropic ion velocity distribution functions. Such calculations are necessary for estimating the neutron flux produced as a result of the interaction between fast particles (deuterons) arising from the injection of a high-energy atomic beam. The first algorithm comprises the calculation of the six-dimensional integral in the velocity space, and the second uses the expansion of the ion distribution function in Legendre polynomials, which allows one to reduce the dimension of integration. The results obtained using these algorithms are compared, and the advantages and disadvantages of both algorithms are discussed.
- Published
- 2021
26. Measurement of Radiation Losses and Effective Ion Charge on the Globus-M2 Tokamak
- Author
-
N. N. Bakharev, A. Yu. Telnova, P. B. Shchegolev, V. K. Gusev, N. V. Sakharov, A. D. Sladkomedova, E. A. Tukhmeneva, V. I. Varfolomeev, G. S. Kurskiev, N. S. Zhil’tsov, S. Yu. Tolstyakov, V. B. Minaev, Yu. V. Petrov, and E. O. Kiselev
- Subjects
010302 applied physics ,Electron density ,Range (particle radiation) ,Tokamak ,Materials science ,Physics and Astronomy (miscellaneous) ,02 engineering and technology ,Radiation ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Power (physics) ,Ion ,Magnetic field ,law ,0103 physical sciences ,Plasma diagnostics ,Atomic physics ,0210 nano-technology - Abstract
In this Letter, results of measurements of radiation losses Prad and effective ion charge Zeff in the conditions of magnetic field up to 0.7 T and plasma current up to 300 kA for a wide range of electron density first obtained on the Globus-M2 tokamak are presented. The analysis of the results shows the decrease in the radiation losses share of the input power on the Globus-M2 tokamak as compared with the same parameter for the Globus-M facility. A large dip at the center of the Prad power profiles is revealed. A decrease in the Zeff values is observed with an increase in electron density.
- Published
- 2021
27. Percutaneous Urolithiasis Surgery in Military
- Author
-
M V Lazutkin, M V Paronnikov, K. A Lukinov, S. A Alentiev, V. V Protoshak, A. A Sivakov, and A. O Kiselev
- Subjects
medicine.medical_specialty ,Percutaneous ,business.industry ,Stone free ,030232 urology & nephrology ,Operating team ,Percutaneous techniques ,medicine.disease ,Surgery ,03 medical and health sciences ,Military personnel ,0302 clinical medicine ,030220 oncology & carcinogenesis ,Sick leave ,Medicine ,Kidney stones ,Clinical efficacy ,business - Abstract
The clinical efficacy and safety of the use of percutaneous techniques in the treatment of kidney stones in 72 servicemen were studied. All percutaneous operations were performed by one operating team. It was found that percutaneous urolithiasis surgery was effective in 88.9% of people. Stone free rate was achieved in 83,8% of military personnel undergoing standard percutaneous nephrolitholapaxy and in 94.3% of patients undergoing minipercutaneous nephrolitholapaxy. With stones larger than 2 cm, the effect was observed in 81.8% of cases with standard surgery and in 96% of patients with mini-percutaneous approach. Percutaneous interventions in military personnel with stones larger than 2 cm were effective in 84,6% of patients with standard surgery and in 90% with mini-percutaneous access. Complications according to the Clavien-Dindo classification were found in 29,1% of servicemen: in 20,8% of cases of standard nephrolitholapaxy and in 8,3% of minipercutaneous nephrolitholapaxy. The bulk of the complications were Grade III 20,8%. Grade III IV were determined less frequently in 8,3% of cases. Urosepsis (Grade IV b) and death (Grade V) were not observed in our study. Duration of labor losses for conscripted servicemen were about 17 days, for contract servicemen when performing standard nephrolitholapaxy 12,8 days, for military personnel with minipercutaneous nephrolitholapaxy 11,2 days. The dismissal rate among conscripts was 18,2%. There were no contractual servicemen who were dismissed from the ranks of the Armed Forces of the Russian Federation, however, 14,7% of servicemen who underwent a standard operation and 11,1% of patients who underwent mini-percutaneous nephrolitholapaxy after surgery needed sick leave for a period of 15 days. In general, percutaneous techniques are common and effective methods of surgical treatment for military personnel suffering from urolithiasis. Mini-percutaneous approach for nephrolitholapaxy is safer than the standard approach, but it is less effective for coral calculi. Percutaneous methods for removing kidney stones are associated with a low rate of dismissal and short recovery times for military personnel.
- Published
- 2020
28. First Observations of Alfvén Cascades on the Globus-M2 Tokamak and Their Application for Minimal Safety Factor Value Analysis
- Author
-
V. K. Gusev, A. M. Ponomarenko, Yu. V. Petrov, N. N. Bakharev, N.A. Khromov, V. B. Minaev, A. Yu. Telnova, A. V. Petrov, A. Yu. Yashin, M. I. Patrov, V. I. Varfolomeev, P. B. Shchegolev, E. O. Kiselev, N. S. Zhil’tsov, N. V. Sakharov, V. A. Tokarev, V. V. Bulanin, I. M. Balachenkov, and G. S. Kurskiev
- Subjects
Physics ,Toroid ,Tokamak ,Safety factor ,Physics and Astronomy (miscellaneous) ,Radius ,Spherical tokamak ,Neutral beam injection ,Computational physics ,Magnetic field ,law.invention ,Physics::Plasma Physics ,law ,Wavenumber - Abstract
On the spherical tokamak Globus-M2 in discharges with toroidal magnetic field of 0.7 T by means of magnetic probes and a number of other diagnostics during neutral beam injection at the current ramp up stage, magnetic field oscillations in the range of 100–300 kHz having their frequency increasing in time, had been observed. Eigenmodes with wavenumbers n = 1–3 and m = 2–4 were being registered. These oscillations were identified as Alfven cascades. By means of multi-channel fluctuation reflectometer, observed eigenmodes were found to be localized near the magnetic shear reversal radius. Application of MHD-spectroscopy technique allowed us to determine safety factor temporal evolution and experimental values are in well agreement with modelling results, provided by ASTRA transport code.
- Published
- 2020
29. Power of 3D Transrectal Ultrasonography and Magnetic Resonance Imaging in Diagnosis of Cryptogenic Rectal Fistulae
- Author
-
A. V. Мatinyan, I. V. Zarodnyuk, Yu. L. Trubacheva, I. V. Kostarev, D. O. Kiselev, and R. R. Eligulashvili
- Subjects
Anal fistula ,Mri techniques ,medicine.diagnostic_test ,anal fistula ,business.industry ,Magnetic resonance imaging ,medicine.disease ,03 medical and health sciences ,0302 clinical medicine ,transrectal ultrasonography ,Paraproctitis ,Patient age ,030220 oncology & carcinogenesis ,medicine ,diagnostics ,Transrectal ultrasonography ,magnetic resonance imaging ,Medicine ,030211 gastroenterology & hepatology ,In patient ,Abscess ,Nuclear medicine ,business ,3d image rendering - Abstract
Background. The only radical curative treatment for rectal fistulae is surgery. The choice of surgery requires precise characterisation of the fistulous tract. The most common instrumental methods for rectal fistula diagnosis are transrectal ultrasonography (TRUS) and magnetic resonance imaging (MRI).Objectives. Comparative assessment of the diagnostic power of 3D TRUS and MRI techniques in revealing cryptogenic anal fistulae with respect to intraoperative examination.Methods. The study enrolled 92 patients with rectal fistulae aged 27 to 66 years. Fistulous opening was external in 47 (51.1%) and obliterated in 45 (48.9%) patients. The average patient age was 42.7 ± 15.9 years. Surgery for acute paraproctitis 14 to 32 days prior to examination was in history of 58 (63.1%) patients. All patients had preoperative subsequent 3D TRUS and MRI compared with intraoperative examination results.Results. The rate of correct fistulous tract type diagnosis verified with intraoperative revision was 96.7% (89/92) with 3D TRUS and 82.6% (76/92) with MRI (p = 0.0027). The error rate of 3D TRUS estimation of external sphincter involvement was 1.1% (1/92), sensitivity 96.6%, specificity 93.5%, overall accuracy 94.5%. The MRI error rate was 21.7% (20/92), with a statistically significant difference for sensitivity and overall accuracy (p < 0.0001). The rate of correct estimation of internal fistulous localisation in “anorectal clock” was 97.8% (90/92) with 3D TRUS and 90% (81/90) with MRI (p = 0.0342). Internal fistula was not detected with MRI in 2/92 (2.2%) cases, which explains the deviation. Intraoperative revision identified total 113 abscesses. The rate or correct abscess estimation was 97.3% (110/113) with 3D TRUS and 74.7% (71/95) with MRI. MRI failed to detect abscess in 18/113 (15.9%) cases (p < 0.0001).Conclusion. 3D transrectal ultrasonography is statistically superior over magnetic resonance imaging in estimating internal fistula localisation in “anorectal clock”, fistulous type, as well as the fistulous tract location relative to external sphincteric tissue in patients with transsphincteric anal fistulae. Estimation of pararectal and intramural abscesses was also significantly different.
- Published
- 2020
30. Comparative analysis of the results of treatment of trans- and suprasphincteric anal fistulae by thermo-obliteration of fistula track with diode laser or monopolar electrocoagulation
- Author
-
I. V. Kostarev, D. O. Kiselev, L. A. Blagadarni, E. E. Zharkov, A. Yu. Titov, E. E. Bolkvadze, A. A. Mudrov, and A. V. Matinyan
- Subjects
Anal fistula ,medicine.medical_specialty ,RD1-811 ,External anal sphincter ,Fistula ,medicine.medical_treatment ,minimally-invasive fistula treatment ,030204 cardiovascular system & hematology ,Electrocoagulation ,03 medical and health sciences ,0302 clinical medicine ,Healing rate ,medicine ,Fecal incontinence ,In patient ,sphincter sparing treatment ,business.industry ,laser anal fistula treatment ,General Medicine ,medicine.disease ,Surgery ,anal fistula ,030211 gastroenterology & hepatology ,medicine.symptom ,business ,fistula coagulation ,Laser coagulation ,filac - Abstract
The objective of the study was to compare the results of two methods of thermo-obliteration of the fistula track by diode laser or monopolar electrocoagulation in patients with trans- and suprasphincteric anal fistulas. Methods and materials . 52 patients (men - 40, women - 12) were included in the study. 29 patients underwent laser coagulation (Laser group) and 23 patients underwent monopolar electrocoagulation (ME group) of fistula track combined with closure of internal fistula opening. Mean age of patients in Laser group was (46±13) years, in ME group - (41±12) years. In the Laser group, 11 (38 %) patients had suprasphincteric fistulae, and 18 (62 %) had transsphincteric fistulae passing through a superficial or deep portion of the external anal sphincter. In the ME group, 9 (39.1 %) patients had an suprasphincteric fistula and 14 (60.9 %) had a transsphincteric fistulae. The minimal period for assessing the healing rate was 2 months after surgery. Results. The average follow-up period after Laser was (9.5±3.0) (5-18) months, after ME - (12.2±7.3) (2-22) months. Primary healing of fistula in 2 months after surgery was 19/29 (65.5 %; 10 transsphincteric and 9 suprasphincteric fistulas) in the Laser group versus 7/23 (30.4 %; 5 transsphincteric and 1 suprasphincteric fistulas) in the ME group (p
- Published
- 2020
31. Assessing the Methods for Forming Interfacial Heat-Mass Exchange Surface in Flowing Air Contact with Water
- Author
-
A. G. Averkin, A. I. Eremkin, and S. O. Kiselev
- Published
- 2022
32. Quality of life in patients with ureterolithiasis
- Author
-
M V Paronnikov, A. O Kiselev, Russia St. Petersburg, and V.V. Protoschak
- Subjects
medicine.medical_specialty ,Quality of life (healthcare) ,business.industry ,medicine ,In patient ,Ureterolithiasis ,Intensive care medicine ,business - Abstract
Introduction. In modern scientific literature it is becoming increasingly popular to study Quality of Life (QoL) index as an integral indicator of the entire therapeutic complex. QoL along with physical examination, laboratory and instrumental tests allows a doctor to fully assess patient’s condition. That is why the QoL researches has been recently become more and more widespread in the scientific papers. Aim. The aim of this study was to determine applicability of the Wisconsin Stone Quality of Life Questionnaire (WISQOL) and the SF-36 General Questionnaire for evaluating treatment outcomes and postoperative follow-up in patients with ureterolithiasis. Materials and methods. 123 patients with diagnosed urolithiasis (ureteral stone) were included in the study. Clinical efficacy of the shock wave lithotripsy (SWL) and contact (laser) ureterolithotripsy (CLT) was assessed after 1 week, 1 and 3 months using stone free rate (SFR). To analyze clinical factors influencing patients QoL, differences in the WISQOL and SF-36 total scores and scores before and after treatment were compared. At the third step, the dynamics of QoL indicators at different stages of treatment was analyzed. Results. The SFR at 1 week, 1 and 3 months after SWL and CLT were 47,1%, 58,8%, 72,5% and 6,4%, 84,7, 93,1% respectively. Gender, age, stone size and the Stone Free Rate achieved during treatment had a significant effect on QoL (p
- Published
- 2020
33. Quality of life of patients with kidney stones
- Author
-
V V Protoshchak, Mikhail V. Paronnikov, Aleksei A. Sivakov, and Artem O. Kiselev
- Subjects
medicine.medical_specialty ,Percutaneous ,SF-36 ,business.industry ,medicine.medical_treatment ,Urology ,Stone size ,medicine.disease ,Extracorporeal shock wave lithotripsy ,Quality of life ,medicine ,Kidney stones ,Stage (cooking) ,business ,Hydronephrosis - Abstract
Relevance. In 2013, the Wisconsin Stone Quality of Life Questionnaire (WISQoL) was developed a specific tool for assessing the quality of life (QoL) in patients with urolithiasis. Aim. To determine the possibility of using the WISQoL and SF-36 questionnaires to study the treatment results of patients with kidney stones. Materials and methods. The study included 218 patients with nephrolithiasis. Patients were divided into 2 groups: the first the size of the stone up to 10 mm and the second from 11 to 20 mm. At the first stage, the efficacy of treatment patients by the extracorporeal shock wave lithotripsy (ESWL) and percutaneous nephrolitholapaxy (PNL) 1 week, 1 and 3 months after surgery was compared. Questionnaires were used to study factors affecting the QOL of patients, including: gender, age, number, density and size of stones, hydronephrosis, stone free rate (SFR), type of surgery. At the next stage, the dynamics of changes in scores for the domains of questionnaires at different stages of treatment was evaluated. Results. The efficacy of treating kidney stones up to 1 cm in size after 3 months with ESWL was 86,1% and PNL 94,4 %, while stones up to 20 mm using ESWL 73,4% and percutaneous techniques 90,6%. Gender, age, stone size, SFR affected the QoL of patients with nephrolithiasis, while the number and density of stones, the presence of hydronephrosis and the type of operation were not significant. Patients 1 week after PNL had lower QoL scores in the domains of social impact and impact on vitalyty of WISQoL and mental heals of SF-36. After 1 month, these changes were determined only in the social impact domain and completely regressed by the 3rd month. Conclusion. SFR after ESWL and PNL in the first group is comparable, in the second group, percutaneous operations were 17,2% more effective. Male gender, age up to 40 years, stone size more than 1 cm, and also not reached SFR negatively affects patients with nephrolithiasis. Compared with ESWL and PNL is accompanied by the worst dynamics of QOL scores only 1 week after the operation; upon further observation, negative changes are leveled.
- Published
- 2020
34. First Globus-M2 Results
- Author
-
M. Iliasova, I V Miroshnikov, V. I. Varfolomeev, V. V. Dyachenko, A. D. Melnik, N. N. Bakharev, A. N. Novokhatsky, N. A. Khromov, A. V. Voronin, P. B. Shchegolev, I.N. Chugunov, I. M. Balachenkov, S. Yu. Tolstyakov, V. B. Minaev, A. N. Konovalov, V. K. Gusev, V. A. Tokarev, A. E. Shevelev, Yu. V. Petrov, E.M. Khilkevitch, O. M. Skrekel, E. A. Tukhmeneva, A. Yu. Telnova, E. O. Kiselev, G. S. Kurskiev, M. I. Patrov, N. V. Sakharov, and F. V. Chernyshev
- Subjects
010302 applied physics ,Physics ,Toroid ,Physics and Astronomy (miscellaneous) ,Plasma ,Spherical tokamak ,Condensed Matter Physics ,01 natural sciences ,Neutral beam injection ,010305 fluids & plasmas ,Computational physics ,Plasma current ,Magnetic field ,Physics::Plasma Physics ,0103 physical sciences ,Stored energy ,Energy (signal processing) - Abstract
Globus-M2—a new 1-Tesla spherical tokamak—was recently launched. The main features and research directions of this machine in scope of fusion–fission reactor development are described. Main results of the first experimental campaign with toroidal magnetic field up to 0.73 T and plasma current up to 0.33 MA are discussed. Significant improvement of the discharge parameters as compared to Globus-M was achieved. Plasma total stored energy higher than 7 kJ was obtained. Energy confinement time increase was consistent with predictions by spherical tokamak scalings. Toroidal Alfven eigenmode-induced losses decrease with increase of plasma current and toroidal magnetic field. For the first time, LHCD with the toroidal wave slowing-down was successfully used at a spherical tokamak.
- Published
- 2020
35. Detection of the Low Energy Recoil 3He in the Reaction 2H(8He,3He)7H
- Author
-
A. V. Gorshkov, S. I. Sidorchuk, A. Serikov, V. Chudoba, S. V. Stepantsov, A. M. Quynh, Yu. L. Parfenova, E. Yu. Nikolskii, S. A. Krupko, I. G. Mukha, W. Piatek, O. Kiselev, S. G. Belogurov, B. Zalewski, M. Yu. Kozlov, G. Kaminski, I. A. Muzalevskii, B. Mauyey, G. M. Ter-Akopian, A. S. Fomichev, D. A. Kostyleva, R. S. Slepnev, E. M. Gazeeva, A. Swiercz, R. Wolski, D. Biare, A. A. Bezbakh, M. S. Golovkov, V. N. Schetinin, P. G. Sharov, P. Szymkiewicz, and L. V. Grigorenko
- Subjects
010302 applied physics ,Normalization (statistics) ,Physics ,010308 nuclear & particles physics ,Detector ,Hadron ,General Physics and Astronomy ,01 natural sciences ,law.invention ,Ion ,Telescope ,Nuclear physics ,Recoil ,Deuterium ,law ,0103 physical sciences ,Energy (signal processing) - Abstract
Investigation of the 7H-system in the experiment conducted at the fragment separator ACCULINNA-2 in the 8He(2H,3He)7H reaction requires to detect the recoil 3He ions with energy down to 6 MeV. For this purpose two $$\Delta E{\text{—}}E$$ particle telescopes are used, with each telescope having in front a thin (20-μm) Si strip detector ($$\Delta E{\text{—}}SSD$$). The maps of thickness heterogeneity of the thin detectors were determined by measuring the energy losses of the 226Ra α-particles. The adopted thickness normalization method provides a good identification of the 3He nuclei being recorded in the presence of a high 4He background. Two approaches were used for calculating the energy losses of the identified 3He and 4He reaction ejectiles and reconstructing their energy values available at the exit from the deuterium target. The developed techniques were applied for the 7H missing-mass reconstruction.
- Published
- 2020
36. Historical and modern aspects of surgical treatment of Ebstein’s anomaly
- Author
-
N. M. Troshkinev, A. Yu. Podoksenov, E. A. Svyazov, O. A. Egunov, E. V. Krivoshchekov, and V. O. Kiselev
- Subjects
medicine.medical_specialty ,Tricuspid valve ,ebstein’s anomaly ,business.industry ,tricuspid valve repair ,Surgical correction ,medicine.disease ,congenital heart defects ,Present moment ,Surgery ,Drug treatment ,medicine.anatomical_structure ,Ventricle ,Ebstein's anomaly ,medicine ,Molecular Medicine ,Medicine ,In patient ,tricuspid valve replacement ,TRICUSPID VALVE REPAIR ,business - Abstract
Congenital heart defects (CHDs) are recognized as the most common type of congenital pathology. The frequency of CHDs reaches 2.4–14.2 % per 1 000 newborns. Ebstein’s anomaly is a rare and complex pathology that can be manifested clinically at any age. Drug treatment is ineffective in patients with this pathology. Preference in this case should be given to surgical treatment. Cardiac surgeons must know basic methods of correction of this pathology, their advantages, and disadvantages. The literature review shows the evolution of Ebstein’s anomaly surgical correction techniques from the middle of the XX century to the present moment. The description of the main tricuspid valve repair techniques, which had an impact on the development of Ebstein’s anomaly surgery, is given. The volume of flap tissue that can be separated from the wall of the right ventricle is the key to successful valve repair. A case of tricuspid valve repair and replacement is given. “Cone” reconstruction is the most promising modern technique. There is also a need in new techniques and modification of the existing ones. The works aimed at their improvement and elimination of imperfections are promising.
- Published
- 2020
37. Surgical Management of Right Aortic Arch Obstruction Associated With Rare Form of Vascular Ring
- Author
-
Oleg A. Egunov, Valeriy O Kiselev, Evgenii A. Sviazov, Nikita M Troshkinev, Evgeny V. Krivoshchekov, and Frank Cetta
- Subjects
Heart Defects, Congenital ,Male ,Aortic arch ,medicine.medical_specialty ,Bypass grafting ,Aorta, Thoracic ,Right descending aorta ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,medicine.artery ,Rare case ,medicine ,Humans ,Child ,business.industry ,Vascular ring ,General Medicine ,medicine.disease ,Sternotomy ,Vascular Ring ,Surgery ,030228 respiratory system ,Echocardiography ,Pediatrics, Perinatology and Child Health ,Clinical case ,Deglutition Disorders ,Tomography, X-Ray Computed ,Cardiology and Cardiovascular Medicine ,business ,Vascular Surgical Procedures - Abstract
This clinical case demonstrated surgical management for a rare case of vascular ring associated with an elongated and kinked aortic arch and a right descending aorta in a ten-year-old male using an extra-anatomic bypass grafting method and dividing the vascular ring. Computer tomography performed at six-month follow-up showed a favorable surgical outcome.
- Published
- 2020
38. Comments on the Selection of a Dispersed Sample to Determine the Magnetic Susceptibility of the Sample and the Dispersed Phase Particles
- Author
-
V. A. Ershova, D. O. Kiselev, A. A. Sandulyak, D. A. Sandulyak, Alexander V. Sandulyak, and M. N. Polismakova
- Subjects
010302 applied physics ,Materials science ,Field (physics) ,Sample (material) ,General Engineering ,Analytical chemistry ,Fraction (chemistry) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Magnetic susceptibility ,Suspension (chemistry) ,Colloid ,chemistry.chemical_compound ,chemistry ,Phase (matter) ,0103 physical sciences ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,Magnetite - Abstract
An analysis has been made of field experimental dependences of the magnetic susceptibility of low-concentration colloids with different values of concentration of the dispersed phase of particles (magnetite). An attempt has been made to generalize them to a single dependence in coordinates in which the ordinate is the concentration-rated susceptibility and thus to determine the magnetic susceptibility of individual particles. It has been shown that the obtained results significantly exceed maximum permissible ones. Furthermore, there is contradiction in them (in using data for one and the same colloid, but with a different concentration of the dispersed phase). This is due to the formation of chains and aggregates of particles. Thus, to determine the magnetic susceptibility of dispersed phase particles, it is necessary to use "hard" dispersed samples, in particular, two-fraction powder samples (with addition of a passive fraction), which ensures the fixation of the dispersed phase particles. Examples have been given of concentration dependences of the magnetic susceptibility of powder samples (with a dispersed phase of magnetite particles), and also of ferro-impurity particles of sugar sand and farina. These dependences having characteristic linear portions make it possible to obtain data on the magnetic susceptibility of individual ferroparticles.
- Published
- 2020
39. ENHANCEMENT OF STATE SUPPORT MECHANISMS FOR SPORTS IN THE RUSSIAN FEDERATIO
- Author
-
Aleksey O. Kiselev and Nikolay I. Iurchenko
- Subjects
State (polity) ,media_common.quotation_subject ,Political science ,Russian federation ,General Medicine ,Public administration ,media_common - Published
- 2020
40. A Multichannel Spectrometric Readout System for Strip Semiconductor Detectors
- Author
-
A. S. Fomichev, I. Eremin, V. Eremin, Yu. V. Chichagov, O. Kiselev, Yu. V. Tubol'tsev, D. A. Kostyleva, A. A. Bezbakh, and A. A. Bogdanov
- Subjects
010302 applied physics ,Physics ,Range (particle radiation) ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,business.industry ,Detector ,STRIPS ,Chip ,01 natural sciences ,Signal ,Semiconductor detector ,law.invention ,Integral nonlinearity ,Gate array ,law ,0103 physical sciences ,Optoelectronics ,business ,Instrumentation - Abstract
A new readout system for strip semiconductor detectors has been developed based on a dedicated IDE1140 chip. The system consists of 64 spectrometric channels that provide readout of signals from detector strips. The source of the trigger signal can be either an external signal or a detector that measures the passage of an ionizing particle through the strips. The amplitude of the signal from this detector can also be used for particle spectrometry. The control and signal-readout unit for the IDE1140 chip has been designed on an EP3C16Q240 field-programmable gate array and is used for processing, storage, and transfer of acquired data. The main characteristics of the system are presented: the integral nonlinearity is
- Published
- 2019
41. Nuclear matter density distributions of the neutron-rich He6,8 isotopes from a sum-of-Gaussian analysis of elastic proton scattering data at intermediate energies
- Author
-
Xiehe Liu, Peter Egelhof, O. Kiselev, and Manfred Mutterer
- Subjects
Diffraction ,Physics ,Valence (chemistry) ,Isotope ,Scattering ,Proton scattering ,Neutron ,Atomic physics ,Nuclear matter ,Glauber - Abstract
Differential cross sections for elastic $p\text{\ensuremath{-}}^{6}\mathrm{He}$ and $p\text{\ensuremath{-}}^{8}\mathrm{He}$ scattering, measured in inverse kinematics at high momentum transfer up to the first diffraction minimum and at projectile energies around 700 MeV/u at GSI Darmstadt, are analyzed applying the sum-of-Gaussians (SOG) method based on the Glauber multiple-scattering theory. The rms point matter radii of $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ are deduced to be 2.29(6) fm and 2.53(7) fm, respectively, in close agreement with those from former analyses using phenomenological parametrizations for describing the matter distributions. With the aid of the measurement at high momentum transfer, the overall radial density distributions of $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ are precisely deduced using the SOG method, in particular at small radii. A pronounced core rearrangement by adding the valence neutrons to an $\ensuremath{\alpha}$-like core to form $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ is elucidated, and briefly discussed.
- Published
- 2021
42. Overview of Globus-M2 spherical tokamak results at the enhanced values of magnetic field and plasma current
- Author
-
N. A. Khromov, Anna Yu Telnova, V. A. Kornev, A. N. Novokhatsky, Evgenii Khilkevich, V. I. Varfolomeev, V. B. Minaev, Andrei D Melnik, A. A. Petrov, A. M. Ponomarenko, V. V. Dyachenko, A. E. Shevelev, E.N. Bondarchuk, N. V. Sakharov, F. V. Chernyshev, S. V. Krikunov, Konstantin Shulyatiev, A. A. Kavin, N. N. Bakharev, I. M. Balachenkov, V. V. Bulanin, N.S. Zhiltsov, V. A. Tokarev, Y. V. Petrov, V. K. Gusev, Eugene G Zhilin, Igor Vitalievich Miroshnikov, O. M. Skrekel, Alexander Yashin, Valery Goryainov, E. O. Kiselev, G. S. Kurskiev, A. V. Voronin, Peter Bagryansky, Margarita Iliasova, M. I. Patrov, E. A. Tukhmeneva, Alexey N Konovalov, P. B. Shchegolev, and Sergey Tolstyakov
- Subjects
Physics ,Nuclear and High Energy Physics ,Spherical tokamak ,Condensed Matter Physics ,Plasma current ,Magnetic field ,Computational physics - Published
- 2021
43. MODERN PROBLEMS OF EDUCATION OF YOUTH OF PHYSICAL CULTURE
- Author
-
Andrej V. Bochkov, Alexander M. Ryltsov, and Alexander O. Kiselev
- Subjects
Physical culture ,Sociology ,Social science - Published
- 2020
44. Hafnium Oxide as a Nanoradiosensitizer under X-ray Irradiation of Aqueous Organic Systems: A Model Study Using the Spin-Trapping Technique and Monte Carlo Simulations
- Author
-
Anastasiia A. Sherstiuk, Ekaterina S. Shiryaeva, V. N. Morozov, I. A. Baranova, Pavel V. Krivoshapkin, Grigorii O. Kiselev, Vladimir I. Feldman, A. V. Belousov, and M. A. Kolyvanova
- Subjects
Materials science ,Radical ,Inorganic chemistry ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,Ceramic ,Irradiation ,Physical and Theoretical Chemistry ,Electron paramagnetic resonance ,Aqueous solution ,Spin trapping ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,chemistry ,visual_art ,visual_art.visual_art_medium ,Methanol ,0210 nano-technology - Abstract
The development of the physicochemical basis for applications of nanoradiosensitizers for targeted treatment of tumors is one of the crucial issues of modern radiotherapy. Ceramic nanoparticles (NPs) composed of heavy metal oxides are considered as prospective sensitizers, particularly for X-ray treatment. This study reports a novel approach for experimental simulations of the radiosensitizing effect of NPs in biomimetic systems based on the quantification of radicals produced from organic components in concentrated aqueous organic solutions using the spin-trapping technique with electron paramagnetic resonance detection. This approach was first applied to X-ray irradiation (45 kVp) of aqueous methanol solutions systems containing different concentrations of hafnium oxide nanoparticles with an average diameter of ca. 84 nm (up to 1.8 wp). It was found that the amount of radicals produced from methanol at the same exposition time increased linearly with the increasing content of HfO2 NPs. The effect can be...
- Published
- 2019
45. Scientific program of DERICA—prospective accelerator and storage ring facility for radioactive ion beam research
- Author
-
O. Kiselev, V. Bart, Aleksei Aleksandrovich Korsheninnikov, Sergei N. Dmitriev, Yurii M. Shatunov, Igor Kalagin, A. A. Yukhimchuk, P. Yu. Shatunov, Vasilii V. Parkhomchuk, S. A. Krupko, Sergei Nikolaevich Ershov, Valery Shvetsov, Boris Yu. Sharkov, Andrei Sergeevich Fomichev, Gurgen Mkrtychevich Ter-Akopian, V.K. Eremin, P. G. Sharov, Sergei Markovich Polozov, N. B. Shulgina, Mikhail Sergeevich Golovkov, Yu. A. Litvinov, A. V. Gorshkov, Igor Meshkov, S. Jaramyshev, M. Pfützner, T. V. Kulevoi, A.V. Karpov, Herbert A. Simon, V. Chudoba, Yu. L. Parfenova, L. V. Grigorenko, E. V. Lychagin, G. V. Trubnikov, A. L. Barabanov, Takeshi Katayama, I. P. Maksimkin, Sergey Bogomolov, I. Mukha, E. Yu. Nikolskii, A. A. Bezbakh, K. Scheidenberger, Mikhail V. Zhukov, S. I. Sidorchuk, and R. S. Slepnev
- Subjects
Radioactive ion beams ,Nuclear reaction ,Particle properties ,Ion beam ,Nuclear engineering ,General Physics and Astronomy ,Nuclear matter ,01 natural sciences ,law.invention ,law ,Project based ,0103 physical sciences ,010306 general physics ,Collider ,010303 astronomy & astrophysics ,Storage ring - Abstract
Studies of radioactive ions (RIs) are the most thriving field of low-energy nuclear physics. In this paper, the concept and the scientific agenda of the prospective accelerator and storage ring facility for RI beam (RIB) research are proposed for a large-scale international project based at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research. The motivation for the new facility is discussed and its characteristics are briefly presented and shown to be comparable to those of advanced world centers, the so-called “RIB factories”. In the project, the emphasis is made on studies with short-lived RIBs in storage rings. A unique feature of the project is the possibility of studying electron–RI interactions in a collider experiment to determine the fundamental properties of nuclear matter, in particular, electromagnetic form factors of exotic nuclei.
- Published
- 2019
46. Toxicity Patterns of Clinically Relevant Metal Oxide Nanoparticles
- Author
-
Vladimir V. Vinogradov, Elena I. Koshel, Elizaveta I. Anastasova, Polina A. Kalikina, Grigorii O. Kiselev, Elena F. Krivoshapkina, Pavel V. Krivoshapkin, Anastasia S. Solovyeva, Valeria B. Saparova, Alexander A. Shtil, Vladimir V. Chrishtop, Sabina R. Gabdullina, Anna F. Fakhardo, and Ekaterina D. Koshevaya
- Subjects
Biomaterials ,Chemistry ,fungi ,Biochemistry (medical) ,Toxicity ,Biomedical Engineering ,food and beverages ,Nanoparticle ,General Chemistry ,Metal oxide nanoparticles ,Pharmacology ,Cytotoxicity ,Acute toxicity - Abstract
Nanostructured drugs are being approved for clinical use, although there is a serious deficit of systematic studies of these materials. Data on toxicity of nanoparticles (NPs) can vary due to different methods of preparation, size, and shape. We investigated the toxicity against cultured human cells, the acute toxicity in mice, and the influence on conjugative transfer of antibiotic resistance genes of clinically relevant NPs such as TiO
- Published
- 2019
47. Using Texture of Linear Objects for Build Enviroments Model and Navigations
- Author
-
I. O. Kiselev and V. P. Noskov
- Subjects
0209 industrial biotechnology ,Optimization problem ,Machine vision ,Computer science ,0211 other engineering and technologies ,Point cloud ,Video camera ,02 engineering and technology ,law.invention ,020901 industrial engineering & automation ,Software ,Artificial Intelligence ,law ,Computer vision ,Electrical and Electronic Engineering ,Sequence ,021103 operations research ,business.industry ,Process (computing) ,Object (computer science) ,Computer Science Applications ,Human-Computer Interaction ,Control and Systems Engineering ,Artificial intelligence ,business - Abstract
The actual tasks of 3D-reconstruction of the industrial-urban environment and navigation models are considered by solving the identification of textured linear objects in the process of movement according to the onboard complex and technical vision system consisting of a mutually adjusted 3D laser sensor and a video camera with a common viewing area. For a complete solution of the navigation task (determination of three linear and three angular coordinates of the control object), it is necessary to select and identify at least three mutually non-parallel flat objects in the process of moving in a sequence of point clouds formed by a 3D laser sensor. In the case of the allocation of less than three flat objects (for example, in environments subjected to destruction), the navigation problem is not fully solved (not all coordinates are determined unambiguously, and some coordinates are related by linear or non-linear dependencies). In these cases, it is proposed to additionally use the texture of the selected flat objects formed by the video camera. In the paper is given the analysis of the features of the solution of the navigation problem is carried out depending on the number of allocated and identifiable textured linear objects in the current integrated images and algorithms for solving the navigation problem are evaluated for selecting and identifying the process of movement of one textured linear object and of two textured non-parallel linear objects. It is shown that in the first case, the use of texture makes it possible to reduce the solution of the navigational problem to a three-dimensional one, and in the second case to a one-dimensional optimization problem (finding the global optimum of a functional three and one variable, respectively). The proposed algorithms for processing complexed images provide a complete solution to the navigation task even if less than three linear objects are selected, which significantly increases the reliability of solving the navigation task and building an environmental model even in industrial-urban environments that have been destroyed, and therefore, the reliability and survivability of the ground ones and airborne robotic tools in autonomous modes of movement. The results of the corresponding software and hardware solutions in real industrial-urban environments, confirmed the accuracy and effectiveness of the proposed algorithms.
- Published
- 2019
48. Heat and Particle Transport in the Initial Phase of Ohmic Discharges in the Globus-M Spherical Tokamak
- Author
-
V. A. Tokarev, V. B. Minaev, Yu. V. Petrov, I. V. Miroshnikov, S. Yu. Tolstyakov, N. A. Khromov, N. N. Bakharev, P. B. Shchegolev, A. Yu. Telnova, E. A. Tukhmeneva, G. S. Kurskiev, N. V. Sakharov, V. K. Gusev, M. I. Patrov, and E. O. Kiselev
- Subjects
010302 applied physics ,Electron density ,Materials science ,Thermonuclear fusion ,Physics and Astronomy (miscellaneous) ,Hydrogen ,chemistry.chemical_element ,02 engineering and technology ,Plasma ,Spherical tokamak ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry ,Phase (matter) ,0103 physical sciences ,Electron temperature ,Atomic physics ,0210 nano-technology ,Ohmic contact - Abstract
The results of experiments and simulations of the transport of heat and particles in the Globus-M spherical tokamak are presented. Investigations were carried out in the ohmic mode in hydrogen and deuterium plasma. It is shown that in the phase of current growth under the same initial conditions, as long as the condition is met at which the minimum of the safety factor exceeds unity, two scenarios of discharge development are possible: with an electron temperature dive or with an electron density peak. After the safety factor reaches the value of 1, the differences are no longer observed. Modeling of transport processes using the ASTRA code showed that the dive of the electron temperature and density is a consequence of the decrease in the transport of heat and particles in the plasma core (i.e., the presence of internal transport barriers).
- Published
- 2019
49. Neutral Beam Current Drive in Globus-M Compact Spherical Tokamak
- Author
-
V. K. Gusev, M. I. Patrov, Yu. V. Petrov, P. B. Shchegolev, G. S. Kurskiev, E. O. Kiselev, A. Yu. Telnova, V. B. Minaev, and N. N. Bakharev
- Subjects
010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,Hydrogen ,chemistry.chemical_element ,Plasma ,Spherical tokamak ,Condensed Matter Physics ,01 natural sciences ,Magnetic flux ,010305 fluids & plasmas ,Bootstrap current ,Magnetic field ,Deuterium ,chemistry ,Physics::Plasma Physics ,0103 physical sciences ,Atomic physics ,Beam (structure) - Abstract
The article presents research on neutral beam current drive in Globus-M compact spherical tokamak. The experiments were performed in the plasma current range of 0.17–0.20 MA with a 0.4- or 0.5‑T toroidal magnetic field. The injection impact parameter was 33 cm. The variable parameters included compositions of plasma and the heating beam (hydrogen, deuterium), plasma density, and vertical displacement of the plasma column. The simultaneous increase in the plasma current and drop in the loop voltage were used to determine the neutral beam current drive. The injection of a hydrogen/deuterium beam into deuterium or hydrogen plasma resulted in a significant and reproducible drop in the loop voltage (up to 0.5 V). In order to process the obtained data, the authors developed an ASTRA code-based model, which allows one to calculate the neutral beam-driven current and bootstrap current. The share of noninductive currents as a function of plasma density during the injection of a hydrogen beam (28 keV, 0.5 MW) into the deuterium plasma was calculated. The authors analyze the results of experiments on off-axis beam injection achieved by vertical displacement of the plasma column and the effect of increasing the toroidal magnetic field on the consumption of the poloidal magnetic flux in discharges with atomic beam injection.
- Published
- 2019
50. COMPARISON OF MODEL AND EXPERIMENTAL CHARACTERISTICS OF FIELD BETWEEN SPHERIC POLE PIECES AT FARADAY BALANCE
- Author
-
D. A. Sandulyak, A. A. Sandulyak, Alexander V. Sandulyak, R. Yu. Tkachenko, M. N. Polismakova, and D. O. Kiselev
- Subjects
Balance (metaphysics) ,Materials science ,Field (physics) ,law ,Quantum electrodynamics ,Faraday cage ,law.invention - Abstract
Experimental coordinate characteristics of magnetic field induction and its gradient are obtained between pole pieces of Faraday balance electromagnetic system. Pole pieces have spheric form that is preferable by possibility of obtaining area with a stable gradient as a working area for specimen’s positioning. Alternative characteristics which are obtained by modeling at the program COMSOL Multiphysics are shown using the same values of supply current and distance between pole pieces as at the experiment. It is shown that together with qualitative commonality of model and experimental characteristics difference of its data at the working area are up to 11 % (by induction), 24 % (by gradient), hereby testify about probable error of conclusive result which is up to 35 %, and up to 5 % by coordinate of gradient extremum. Questions about determining correction factor are discussed (normalizing factor for model characteristic); at its proved value equals 0,86 (e.g. at starting exclude of 14 % «systematic» error, probably obtained at the case of using results after modeling) a differences of mentioned data are up to 4, 5, 5% accordingly.
- Published
- 2019
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.