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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kashkina L. V., Stebeleva O. P., Emelyanova T. Y., Petrakovskaya E. A., Bayukov O. A.
Заглавие : Hydrodynamic dispersion of calcium aluminosilicate from technogenic and nonmetallic material
Место публикации : J. Sib. Fed. Univ. Eng. Technol. - 2014. - Vol. 7, Is. 1. - P.3-12; Журн. СФУ. Сер. "Техника и технологии"
Ключевые слова (''Своб.индексиров.''): hydrodynamic dispersion--cavitation--crystal ceramic foam--porous glass material--гидродинамическое диспергирование--кавитация--зола--пеноматериал--пористая стеклокерамика
Аннотация: Physicochemical properties of two calcium aluminosilicate materials after reducing in the hydrodynamic rotary generator in supercavitation mode were studied. The samples are the crystal ceramic foam based on Kansko-Achinsk lignite-ash and the porous glass material obtained from low-manganese nonmetallic feed. X-ray phase analysis, EPR-method, NPR-method (the Mossbauer Effect) and optical microscopy were used. It was found that the material is changing its stucrure in a hydrodynamic dispersion process caused by high-cavitation. The nature of the changes depends on its initial state.Изучены физико-химические свойства двух кальций-алюмосиликатных материалов после измельчения в гидродинамическом генераторе роторного типа в режиме суперкавитации. Исследованы образцы – кристаллическая пенокерамика на основе зол бурых Канско-Ачинских углей и пористый стекломатериал, полученный из нерудного сырья с низким содержанием марганца. Для анализа были использованы методы РФА, ЭМР, ЯГР (эффект Мёссбауэра), оптическая микроскопия. Показано, что в процессе гидродинамического диспергирования за счет высокоэнергетического кавитационного воздействия в материалах происходят глубокие структурные изменения. Получено, что характер изменений зависит от исходного состояния исследуемого материала.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaykhutdinov K. A., Balaev D. A., Gokhfeld D. M., Kuzmin Y. I., Popkov S. I., Petrov M. I.
Заглавие : Study of current-voltage characteristics of Bi-based high-temperature superconductors with fractal cluster structure
Коллективы : International Workshop on Weak Superconductivity
Место публикации : Physica C. - 2006. - Vol. 435, Is. 1-2. - P.19-22. - ISSN 0921-4534, DOI 10.1016/j.physc.2006.01.010
Примечания : Cited References: 18
Предметные рубрики: NORMAL-PHASE
VORTEX MOTION
TRANSPORT
Ключевые слова (''Своб.индексиров.''): superconducting foam--pinning--critical current density--fractal--percolation--cluster--cluster--critical current density--fractal--percolation--pinning--superconducting foam--bismuth--critical current density (superconductivity)--electric currents--electric potential--foams--percolation (solid state)--polycrystalline materials--cluster--fractal--pinning--superconducting foam--superconducting materials
Аннотация: We study the effect of the structure on critical currents and current-voltage characteristics (CVC's) of foamed bismuth-based polycrystalline high-temperature superconductors (HTSC). The fractal cluster structure of superconducting foams has been observed and the fractal dimension of boundaries between superconducting and normal clusters has been determined. Based on the magnetic and transport properties of the foamed polycrystalline superconductors, we have shown that the initial parts of CVC's of the superconducting foams are described well by the model that accounts the magnetic flux trapping in fractal clusters of a normal phase. (c) 2006 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Balaev D. A., Popkov S. I., Shaykhutdinov K. A., Petrov M. I.
Заглавие : Magnetization loop and critical current of porous Bi-based HTS
Место публикации : Physica C: ELSEVIER SCIENCE BV, 2006. - Vol. 434, Is. 2. - P135-137. - ISSN 0921-4534, DOI 10.1016/j.physc.2005.12.088
Примечания : Cited References: 11
Предметные рубрики: SUPERCONDUCTORS
Ключевые слова (''Своб.индексиров.''): porous superconductor--critical current--bean model--foam--bean model--critical current--foam--porous superconductor--hysteresis--magnetization--mathematical models--porous materials--bean model--critical current--foam--porous superconductor--superconductivity
Аннотация: The magnetization of porous Bi(1.8)Pb(0.3)Sr(2)Ca(2)Cu(3)O(x) has been investigated. The experimental magnetization hysteretic loops of M(H) were described in the frames of Val'kov-Khrustalev model developed for type II granular superconductors. (c) 2005 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka, Michael R., Naik, Sugali Pavan Kumar, Koblischka-Veneva, Anjela, Murakami, Masato, Gokhfeld D. M., Reddy, Eddula Sudhakar, Schmitz, Georg J.
Заглавие : Superconducting YBCO Foams as Trapped Field Magnets
Коллективы : ANR [ANR-17-CE05-0030]; DFG [DFG-ANR Ko2323-10]; SIT start-up grant
Место публикации : Materials. - 2019. - Vol. 12, Is. 6. - Ст.853. - ISSN 1996-1944, DOI 10.3390/ma12060853
Примечания : Cited References: 62. - This work is part of the SUPERFOAM international project funded by ANR and DFG under the references ANR-17-CE05-0030 and DFG-ANR Ko2323-10, respectively. Further funding by a SIT start-up grant is also gratefully acknowledged.
Предметные рубрики: CRITICAL CURRENT-DENSITY
TRANSPORT-PROPERTIES
SINGLE-GRAIN
BULK
Ключевые слова (''Своб.индексиров.''): high-tc superconductors--ybco--foam--trapped fields--current flow
Аннотация: Superconducting foams of YBa2Cu3Oy (YBCO) are proposed as trapped field magnets or supermagnets. The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of 0.5 T produced by a square Nd-Fe-B permanent magnet. The maximum trapped field (TF) measured is about 400 G (77 K) at the bottom of the sample. Several details of the TF distribution, the current flow and possible applicatons of such superconducting foam samples in space applications, e.g., as active elements in flux-pinning docking interfaces (FPDI) or as portable strong magnets to collect debris in space, are outlined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka M. R., Pavan Kumar Naik S., Koblischka-Veneva A., Gokhfeld D. M., Murakami M.
Заглавие : Flux creep after field trapping in YBa2Cu3Ox foams
Место публикации : Supercond. Sci. Technol. - 2020. - Vol. 33, Is. 4. - Ст.044008. - ISSN 09532048 (ISSN), DOI 10.1088/1361-6668/ab72c3
Примечания : Cited References: 38. - We thank G Schmitz (ACCESS, Aachen, Germany) for providing us with the foam sample, and K Berger, B Douine and Q Nouailhetas (GREEN, Nancy, France) for valuable discussions concerning applications of the superconducting foam materials. This work is part of the SUPERFOAM International Project funded by ANR and DFG under references ANR-17-CE05–0030 and DFG-ANR Ko2323–10, respectively
Аннотация: The time-dependence of the field distribution on the surface of YBa2Cu3O x (YBCO) foam samples after field trapping is analysed. The foam samples were magnetised using a bulk permanent magnet at 77 K, and the trapped fields (TFs) were recorded with a scanning Hall probe 1 mm above the sample surface. Besides a large TF peak, several small peaks are observed. The time dependence of the local fields of these peaks and of the large peak are clearly different, which points to a different origin. In this way, the time-dependent TF measurements reveal important information about the current flow in the foam samples. A non-logarithmic relaxation process takes place in the foam samples. Furthermore, we compare these results with classic creep measurements performed on an individual foam strut removed from the bulk. The creep rate for the TF distribution is found to be ~8%, whereas the creep rate of the foam strut is about 4% in a large temperature and field range (20–60 K, 0–2 T).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Koblischka M. R., Koblischka-Veneva A.
Заглавие : Highly Porous Superconductors: Synthesis, Research, and Prospects
Место публикации : Phys. Metals Metallogr. - 2020. - Vol. 121, Is. 10. - P.936-948. - ISSN 0031-918X, DOI 10.1134/S0031918X20100051. - ISSN 1555-6190(eISSN)
Примечания : Cited References: 146
Предметные рубрики: HIGH-T-C
CRITICAL-CURRENT DENSITY
HIGH-TEMPERATURE SUPERCONDUCTORS
Аннотация: This paper presents a review of studies of superconductors with a porosity above 50%. The pores in such superconducting materials allow refrigerant penetration and provide efficient heat dissipation and stable operation. Methods for the synthesis of the main groups of porous superconductors are described. The results of studies of the structural, magnetic, and electrical transport properties are presented, and the features of the current flow through porous superconductors of various types are considered. The directions of further development and application of porous superconductors are presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova A. N., Kashurnikov V. A., Moroz A. N., Gokhfeld D. M.
Заглавие : Trapped field in superconductors with perforations
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [20-21-00085]; ROSATOM [20-21-00085]
Место публикации : J. Supercond. Nov. Magn. - 2022. - Vol. 35, Is. 1. - P.283-290. - ISSN 1557-1939, DOI 10.1007/s10948-021-06067-7. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 35. - The reported study was funded by RFBR and ROSATOM according to the research project No 20-21-00085 (V.A. Kashurnikov, A.N. Moroz)
Предметные рубрики: MAGNETIZATION
BULK
Аннотация: The Monte Carlo method has been used to calculate the trapped magnetic field in superconducting plates with holes. The mechanism of flux pinning on the holes is implemented with special subprocesses added to the algorithm: vortex capture and emission, both occurring on the hole boundaries. Secondary peaks related to the holes emerge on the calculated profiles of the trapped magnetic field. It has been found that these peaks disappear in plates with sufficiently strong pinning or when the computational mesh is coarse (the case corresponding to a low resolution of probes in experiments). The dependence of the trapped field on the hole radius has been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka M. R., Koblischka-Veneva A., Nouailhetas Q., Hajiri G., Berger K., Douine B., Gokhfeld D. M.
Заглавие : Microstructural parameters for modelling of superconducting foams
Место публикации : Materials. - 2022. - Vol. 15, Is. 6. - Ст.2303. - ISSN 19961944 (ISSN), DOI 10.3390/ma15062303
Примечания : Cited References: 62
Аннотация: Superconducting YBa2Cu3Oy (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y2 BaCuO5 foams which are then converted into superconducting YBCO by using the infiltration growth process. For modelling the supercon-ducting and mechanical properties of the foam samples, a Kelvin-type cell may be employed as a first approach as reported in the literature for pure polyurethane foams. The results of a first modelling attempt in this direction are presented concerning an estimation of the possible trapped fields (TFs) and are compared to experimental results at 77 K. This simple modelling revealed already useful information concerning the best suited foam structure to realize large TF values, but it also became obvious that for various other parameters like magnetostriction, mechanical strength, percolative current flow and the details of the TF distribution, a refined model of a superconducting foam sample incorporating the real sample structure must be considered. Thus, a proper description of the specific microstructure of the superconducting YBCO foams is required. To obtain a set of reliable data, YBCO foam samples were investigated using optical microscopy, scanning electron microscopy and electron backscatter diffraction (EBSD). A variety of parameters including the size and shape of the cells and windows, the length and shape of the foam struts or ligaments and the respective intersection angles were determined to better describe the real foam structure. The investigation of the foam microstructures revealed not only the differences to the original polymer foams used as base material, but also provided further insights to the infiltration growth process via the large amount of internal surface in a foam sample.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fadeeva N. P., Pavlov M. V., Kharchenko I. A., Simunin M. M., Shabanova K. A., Pavlov V. F., Ryzhkov I. I.
Заглавие : High strength ceramic substrates based on perlite and foam silicates for filtration membranes
Место публикации : Membr. Membr. Technol. - 2022. - Vol. 4, Is. 3. - P.170-176. - ISSN 25177516 (ISSN), DOI 10.1134/S2517751622030040
Примечания : Cited References: 32. - The work was performed using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences. This work was partially supported by the Russian Foundation for Basic Research, grant no. 18-29-19078
Аннотация: Samples of two-layer ceramics based on polydisperse powder of the pearlite mineral and foam silicates possessing high compressive strength up to 50 MPa, thermal stability up to 1150°C, and water permeability of 272 m3/h m2 bar have been obtained. According to the X-ray powder diffraction analysis, the supporting substrate material is X-ray amorphous. The average pore size of the supporting substrate is 40 µm, while the average pore size of the modifying layer is 17 µm according to the bubble method and electron microscopy. The obtained materials are promising for use as substrates of microfiltration, ultrafiltration, and nanofiltration membranes.
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