118 research outputs found
Two-dimensional growth, anisotropic polaron transport, and magnetic phase segregation in epitaxial Nd0.52Sr0.48MnO3 films
No full textNd0.52Sr0.48MnO3 films have been fabricated by dc magnetron sputtering on single-crystal LaAlO3 (001) and SrTiO3 (011) substrates with additional annealing to relax the lattice strain. Although the Nd0.52Sr0.48MnO3 films were deposited simultaneously on different substrates at the same deposition rate, they differ in thickness by a factor of ? . The observed difference in thickness is explained by the two-dimensional (layer-by-layer) film growth, rather than by a difference in growth rate controlled by the crystalline orientation of the substrate. An analysis of optical and transport properties reveals that the observed anisotropy in the polaron motion is governed by a strong anisotropy in the trapping energy, rather than in polaron formation. It is shown that the deposited Nd0.52Sr0.48MnO3 films exhibit magnetic behavior typical of two-phase magnetic systems and should be regarded as an assembly of interacting magnetic clusters.Applied Science
Low Temperature Physics V. 30, I. 04
No full textLow Temperature Physics -- April 2004
Volume 30, Issue 4, pp. 261-344
Advances in point-contact spectroscopy: two-band superconductor MgB2 (Review)
I. K. Yanson and Yu. G. Naidyuk
Full Text: PDF (809 kB)
SUPERCONDUCTIVITY, INCLUDING HIGH-TEMPERATURE SUPERCONDUCTIVITY
Features of the local structure of fine-grained HTSC YBa2Cu2.985 57Fe0.015Oy
A. A. Vishnev, E. F. Makarov, L. G. Mamsurova, K. S. Pigalskiy, and Yu. V. Permyakov
Full Text: PDF (169 kB)
Structural and high-frequency (0–110 MHz) resistive characteristics of MgB2 in the temperature range 5–300 K
V. M. Dmitriev, N. N. Prentslau, V. N. Baumer, N. N. Galtsov, L. A. Ishchenko, A. L. Prokhvatilov, M. A. Strzhemechny, A. V. Terekhov, A. I. Bykov, V. I. Liashenko, Yu. B. Paderno, and V. N. Paderno
Full Text: PDF (125 kB)
LOW-TEMPERATURE MAGNETISM
Temperature dependence of the conductivity, thermopower, and heat capacity of TlCoS2
E. M. Kerimova, S. N. Mustafaeva, M. A. Aldjanov, and A. I. Jabbarly
Full Text: PDF (40 kB)
The approximation of geometrical optics for bulk spin waves in spatially inhomogeneous ferromagnetic insulators with an exchange defect
S. A. Reshetnyak
Full Text: PDF (67 kB)
Structural imperfection, phase transitions, and the properties of magnetoresistive ceramic and films of La0.66Mn1.23V0.11(c)O2.842-V0.16(a)
V. P. Paschenko, A. A. Shemyakov, A. V. Pashechenko, L. T. Tsymbal, G. K. Kakazei, V. P. Dyakonov, H. Szymczak, J. A. M. Santos, and J. B. Sousa
Full Text: PDF (94 kB)
Electronic structure and x-ray magnetic circular dichroism in uranium monochalcogenides
V. N. Antonov, B. N. Harmon, O. V. Andryushchenko, L. V. Bekenev, and A. N. Yaresko
Full Text: PDF (212 kB)
LOW-DIMENSIONAL AND DISORDERED SYSTEMS
Boundary friction on molecular lubricants: rolling mode?
V. M. Loktev and Yu. G. Pogorelov
Full Text: PDF (99 kB)
QUANTUM EFFECTS IN SEMICONDUCTORS AND DIELECTRICS
Charge ordering and interlayer phase coherence in quantum Hall superlattices
S. I. Shevchenko, D. V. Fil, and A. A. Yakovleva
Full Text: PDF (104 kB)
Low-temperature anomalies of the mobility and Shubnikov–de Haas oscillations due to electron resonance scattering on donor impurities in semiconductors. Explanation based on the Friedel approach
V. I. Okulov, L. D. Sabirzyanova, K. S. Sazonova, and S. Yu. Paranchich
Full Text: PDF (56 kB)
LOW-TEMPERATURE PHYSICS OF PLASTICITY AND STRENGTH
Structural mechanisms of low-temperature work hardening and fracture of cryogenic metallic materials
Yu. A. Pokhyl
Full Text: PDF (134 kB)
Features of the low-temperature creep of a Nb–Ti alloy after large plastic deformations at 77 K
V. K. Aksenov, O. I. Volchok, E. V. Karaseva, and Ya. D. Starodubov
Full Text: PDF (55 kB)
ERRATA
Erratum: Fluctuation conductivity and critical currents in YBCO films [Low Temp. Phys. 29, 973 (2003)]
A. L. Solovjov, V. M. Dmitriev, V. N. Svetlov, and V. B. Stepanov
Full Text: PDF (19 kB)Archived web conten
Properties of Hybrid Complexes Composed of Photosynthetic Reaction Centers from the Purple Bacterium Rhodobacter sphaeroides and Quantum Dots in Lecithin Liposomes
No full textA photosynthetic reaction center (RC) is a natural mesoscopic structure with dimensions of ~10 nm However, for creating a RC-based hybrid energy transformer it is necessary to solve some problems. First, it is necessary to obtain a high stability of photosynthetic pigment-protein complexes in vitro, because without photoprotection and repair systems they are subject to pronounced photodestruction. Second, the solar light absorption by the pigment-protein complexes of RCs is not equally efficient throughout the whole spectrum: the main absorption bands of the RC pigments are in the blue and near infrared regions of the spectrum, and it is impor- ISSN 0006-2979, Biochemistry (Moscow), 2014, Vol. 79, No. 11, pp. 1183-1191. © Pleiades Publishing, Ltd., 2014. Original Russian Text © V. E. Zagidullin, E. P. Lukashev, P. P. Knox, N. Kh. Seifullina, O. S. Sokolova, E. V. Pechnikova, H. Lokstein, V. Z. Paschenko, 2014, published in Biokhimiya, 2014, Vol. 79, No. 11, pp. 1452-1463 On-Line Papers in Press, as Manuscript BM14-145, Published on September 7, 2014. 1183 Abbreviations: BChl, bacteriochlorophyll; BPheo, bacteriopheophytin; D-D, detergent-and dialysis-based method of liposomes preparation; RC, photosynthetic reaction center; QDs, quantum dots. * To whom correspondence should be addressed. Abstract-Quantum dots (QDs) can absorb ultraviolet and long-wavelength light energy much more efficiently than natural light-harvesting proteins and transfer the excitation energy to photosynthetic reaction centers (RCs). Inclusion into liposomes of RC membrane pigment−protein complexes combined with QDs as antennae opens new opportunities for using such hybrid systems as a basis for artificial energy-transforming devices that potentially can operate with greater efficiency and stability than devices based only on biological components. RCs from Rhodobacter sphaeroides and QDs with fluorescence maximum at 530 nm (CdSe/ZnS with hydrophilic covering) were embedded in lecithin liposomes by extrusion of a solution of multilayer lipid vesicles through a polycarbonate membrane or by dialysis of lipids and proteins dispersed with excess detergent. The dimensions of the resulting hybrid systems were evaluated using dynamic light scattering and by transmission cryoelectron microscopy. The efficiency of RC and QD interaction within the liposomes was estimated using fluorescence excitation spectra of the photoactive bacteriochlorophyll of the RCs and by measuring the fluorescence decay kinetics of the QDs. The functional activity of the RCs in hybrid complexes was fully maintained, and their stability was even increased. Properties of Hybrid Complexes Composed of Photosyntheti
The reaction of pea’s plants pro-antioxidant system on biostimulants stimpo and regoplant treatment
No full textPeas (Pisum sativum L.) are one of the main leguminous plants grown in Ukraine. The sown square of peas is 0,3 min. ha and 25% of them is in stepp. Peas are very light-, water- and soil-demanding culture, that’s why not realize its genetic productivity potential under adverse environmental conditions, owing to photosynthetic and photophosphorylation processes malfunctioning, changing in water state and development of oxidative defence. The usage of growth regulators normalize the metabolism and increase the crop production. The antioxidant system is very important for plant adaptation, and biostymulants Stimpo and Regoplant increase the plants stress resistance. The aim of presented work was to determine the impact of bioregulators Stimpo and Regoplant on the peroxidation processes, changes of antioxidant enzimes activity, proline content during peas onthogenesis under the conditions of South Steppe of Ukraine
The measuring of structure inhomogeneity sizes in armor composite materials by two-dimensional processing of scanning data
No full textDesigning of Loss Optimum Regulator for Control of D.C. Electric Drive with Varying Inertia Moment in CoDeSys Programming System
No full textCoDeSys programming system is considered as the most complete version of software for programmed logical controllers (PLC) that meets requirements of IEC 61131-3-standard. The given software is the most suitable for simulation and development of control system algorithms and execution of semi-full-scale tests without involvement of an actual object. Programming medium operated at a personal computer in Windows medium. As CoDeSys provides a machine code it is rather easy to support its programming and its minimum support presupposes selection of IN/OUT and program debugging functions.The investigations have been directed on optimization of an electric drive operation with varying inertia moment. The whole software developed for the solution of the considered problem, has been written and realized in the CoDeSys programming system. «Modified principle of maximum» of V. I. Panasiuk is applied as a body of mathematics that allows to obtain positive results of the investigations
HOW SOFTWARE COMPANY ENGINEERS PERCEIVE CHANGES IN PRODUCTION
No full textThis article is dedicated to describing the results of Delphi Study, organized by the author from April to July of 2014 in 11 countries of Central and Western Europe, including Russia. Those countries have a similar history of software development process maturity in last 15 years. Study was focused on engineer’s perception and experience in change implementation in software development processes. The main problems, defined in study and this article, are organizational resistance, change management, typical risks in change implementation in software domain and measurements of risk’s effect reducing. Also there are major recommendation for process management optimization and specific risk management in IT domain
The electromagnetic interaction of a nonmonochromatic field and a moderately orthotropic composite material with a dielectric surface coat
No full textThe calculation of structure inhomogeneity influence on eddy currents value in armor composite material
No full textTHE METRIZATION LANDSCAPE BIOCENTRIC-NETWORK CONFIGURATION WITHIN THLEFT-BANK THE DNIPRO RIVER OF UKRAINE TERRITORY
No full textThe biocentric-network configuration of landscapes (BNCL) is understood as a variety of biocenters that located at the matrix of landscapes and along which the biotic migrations take places. The theoretic-methodological contemporary apparatus of BNCL exploration formed by scientific results which we could find out in works of European and Ukrainian scientists, in particular: A. Buchek, Ja. Lazina, I. Ljov, P Kavaljauskas, R. Forman, M. Godron, M. Grodzinskyi, P. Shyschenko, V. Paschenko, S. Kukurudza, etc. Nevertheless, lack of works which could clarify questions of landscape representativeness and metrization BNCL under conditions of considerable fragmented and anthropogenic territories leads us to accomplishment becoming exploration.
Thus, the aim of the article is to determine landscape representiveness (at the levels of type, and sort of landscape complexes) of BNCL by using results of our mapping modelling of landscape-typological structure of the Left-Bank the Dnipro river of Ukraine territory, the structure of BNCL and the nature reserved fund, which could be a good background for choosing criteria of landscape planning typological units distinguishing and for the future possibility of usage it for the purpose of landscape planning tools implementation.
The region of the exploration – the Left-Bank the Dnipro river of Ukraine territory – is understood as a totality of four administration region of Ukraine, such as Poltavsjka, Sumsjka, Harkivsjka, and Chernighivsjka. The levels of landscape representiveness were determined by using GIS-parcel MapInfo Professional 10.0.1, and type, and sort of landscape complexes data, including 1 552 objects of nature reserved fund (by 1.11.2016). The methodical basis of the research is formed by the system of methods such as mapping, graphical, statistic, analysis, and synthesis, etc., especially the method of laying on to each other the mapping models of sort of landscape, the nature reserve fund, and the BNCL structure of the Left-Bank the Dnipro river of Ukraine territory done by the author. The level of landscape representiveness of landscapes sorts by the elements of BNCL is understood as plurality it on the unit of a biocentric area. According to the received results of region landscape representiveness calculation at the level of sort of landscapes, we summarized that same objects of BNCL has high or low level of its.
The metrization of elements the BNCL structure helps us to distinguish “central” and “provincial” biocenters. Altogether, received results of graphical and matrix modeling the BNCL will be a good background for the future landscape planning tools implementation.</jats:p
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