96 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
Designing 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
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 electromagnetic interaction of a nonmonochromatic field and a moderately orthotropic composite material with a dielectric surface coat
No full textClinical case of a patient with pulmonary capillary hemangiomatosis: rapid progression or lost time?
No full textThe article describes a clinical case of a 37-year-old patient with pulmonary capillary hemangiomatosis of functional class IV according to the WHO classification with difficulties of diagnostic search and features of PAH-specific therapy.Pulmonary arterial hypertension - group 1 in the clinical classification is represented by several forms of pathology, including very rare diseases such as pulmonary veno-occlusive disease and pulmonary capillary hemangiomatosis.The difficulties of diagnostic search consist in the absence of specific symptoms, a variety of interstitial or focal changes according to spiral computed tomography, and the final diagnosis can be made only after performing a lung biopsy, which is associated with a high risk of possible complications. During the initial treatment and examination of the patient, clinical and hemodynamic parameters did not immediately allow to suspect the presence of pulmonary capillary hemangiomatosis. And only the difficulties of the patient’s management associated with the lack of the expected effect of the therapy with PAH-specific drugs served as the basis for further diagnostic search.Against the background of taking vasodilators, with the normalization of hemodynamic parameters, the progression of respiratory and right ventricular insufficiency was noted in the patient. According to the results of an additional examination, a diagnosis of pulmonary capillary hemangiomatosis was established, therapy was corrected and further tactics of management and treatment of the patient were determined. Currently, the patient is awaiting transplantation at V.I. Shumakov national medical research center and receives specific therapy with riociguate 2.5 mg TID and bosentan 125 mg BID
SOME TRACE ELEMENT CONTENT IN TISSUES HONEYBEES UNDER FEEDING, SUGAR SYRUP, MEAL SOYA AND CITRATE CO AND NI
No full textПодано результати досліджень впливу підгодівлі бджіл цукровим сиропом з додаванням борошна з бобів сої сорту Чернівецька–9, а також різних кількостей «наноаквацитратів» Со і Ni в умовах термостату на вміст Fe, Co, Cu, Zn, Ni, Cd та Pb у тканинах організму медоносних бджіл. У першому періоді досліджень встановлено вірогідно вищий вміст Co і Zn на тлі зниження Cu у тканинах бджіл III–ої групи, яким згодовували борошно з бобів сої (25 г) і цитрату Со (СоНЦ) в дозі 2 мг Со, а також Zn в II–ій групі. За впливу борошна сої з додаванням цитрату Ni (NiНЦ) в дозі 1 мг Ni у IV –ій групі знижувався вміст у тканинах Fe, Co, Cu і Zn та підвищувався – Ni і Pb. Комплексне поєднання цитратів Co і Ni в дозах 2 мг Co і 1 мг Ni у V –ій дослідній групі супроводжувалось зниженням вмісту Fe і Cu у тканинах бджіл на тлі зростання вмісту Со та Ni. За умов додавання до цукрового сиропу (ЦС) борошна сої (II гр.) і «наноаквацитратів» Co та Ni (III, IV і V гр.) у 2–ий період досліджень у тканинах бджіл II гр. зменшився рівень Fe, Co іNi, а III –ої (2мг Со) групи зріс вміст Zn і Pb на тлі зниження вмісту Ni. Відзначено нижчий вміст Fe, Co і Zn у тканинах бджіл IV і V груп та Cu – тільки V групи на тлі зростання у цих групах вмісту Ni. Представлены результаты исследований влияния подкормки пчел сахарным сиропом с добавлением муки с бобов сои сорта Черновицкая–9, а также различных количеств «наноаквацитратов» Со и Ni в условиях термостата на содержание Fe, Co, Cu, Zn, Ni, Cd и Pb в тканях организма медоносных пчел. В первом периоде исследований установлено достоверно высшее содержание Co и Zn на фоне снижения Cu в тканях пчел III –й группы, которым скармливали муку с бобов сои (25 г) и цитрата Со (СоНЦ) в дозе 2 мг Со, а также Zn во II –й группе. При влиянии муки сои с добавлением цитрата Ni (NiНЦ) в дозе 1 мг Ni в IV –й группе снизилось содержание в тканях Fe, Co, Cu и Zn и повысилось содержание – Ni и Pb. Комплексное сочетание цитратов Co и Ni в дозах 2 мг Co и 1 мг Ni в V –й опытной группе сопровождалось снижением содержания Fe и Cu в тканях пчел на фоне роста содержания Со и Ni. При добавлении к сахарному сиропу (ЦС) муки сои (II гр.) и «наноаквацитратов» Co и Ni (III, IV и V гр.) во 2–ом периоде исследований в тканях пчел II гр. уменьшился уровень Fe, Co и Ni, а III – ей (2 мг Со) группы увеличилось содержание Zn и Pb на фоне снижения содержания Ni. Отмечено низшее содержание Fe, Co и Zn в тканях пчел IV и V групп и Cu – только в V группе на фоне увеличения в этих группах содержания Ni. The results of studies of the effect feeding bees sugar syrup with the addition of flour from soybeans varieties Chernivtsi–9, and various amounts of «nanoakvatsytrats» Co and Ni in terms thermostat on the content of Fe, Co, Cu, Zn, Ni, Cd and Pb in tissues honeybees. In the first period studies found significantly higher levels of Co and Zn Cu amid falling in the tissues of bees III –term groups fed meal from soybeans (25 g) and citrate Co (СоNTs) at a dose of 2 mg Co and Zn in II –s group. Under the influence soybean meal with addition of citrate Ni (NiNTs) at a dose of 1 mg Ni in group IV –s reduced content in tissues Fe, Co, Cu and Zn and rose – Ni and Pb. Citrate complex combination of Ni and Co in doses of 2 mg 1 mg Co and Ni in the V –s experimental group was accompanied by a decrease in content of Fe and Cu in tissues of bees against the background of the content of Co and Ni. Given the addition to the sugar syrup (SS) soybean meal (II gr.) and «nanoakvatsytrats» Co and Ni (III, IV and V g.) in the second period of research in the tissues of bees II gr. decreased levels of Fe, Co and Ni, and III of th (Co 2 mg) increased the content of Zn and Pb on the background of reduction of Ni. Noted lower content of Fe, Co and Zn in the tissues of bees IV and V groups and Cu – V group only against the back ground of these groups content Ni.
Pinning features of the magnetic flux trapped by YBCO single crystals in weak constant magnetic fields
No full textKinetic models of photosystem II should accommodate the effect of donor side quenching on variable chlorophyll a fluorescence in the microseconds time
No full textQuantitative data on laser flash-induced variable fluorescence in the 100 ns to 1 ms time range (Belyaeva et al. in Photosynth Res 98:105–119, 2008) confirming those of others (Steffen et al. in Biochemistry 40:173–180, 2001, Biochemistry 44:3123–3132, 2005; Belyaeva et al. in Biophysics 51(6):976–990, 2006), need a substantial correction with respect to magnitude of the normalized variable fluorescence associated with single turnover-induced charge separation in RCs of PS II. Their data are conclusive with the involvement of donor side quenching, the release of which occurs with a rate constant in the range of tens of ms-1, and presumed to be associated with reduction of YZ+ by the OE
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