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  • Biochemistry and Biotechnology  (4)
  • 76.60.Gv  (3)
  • 61.72.Hh  (2)
  • DSC  (2)
  • Matter waves and collective properties of cold atoms and molecules  (2)
  • 1
    facet.materialart.
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    Long-lived periodic revivals of coherence in an interacting Bose-Einstein condensate (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-08-23
    Description: Author(s): M. Egorov, R. P. Anderson, V. Ivannikov, B. Opanchuk, P. Drummond, B. V. Hall, and A. I. Sidorov We observe the coherence of an interacting two-component Bose-Einstein condensate (BEC) surviving for seconds in a trapped Ramsey interferometer. Mean-field-driven collective oscillations of two components lead to periodic dephasing and rephasing of condensate wave functions with a slow decay of the... [Phys. Rev. A 84, 021605] Published Mon Aug 22, 2011
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Measurement of s-wave scattering lengths in a two-component Bose-Einstein condensate (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-21
    Description: Author(s): M. Egorov, B. Opanchuk, P. Drummond, B. V. Hall, P. Hannaford, and A. I. Sidorov We use collective oscillations of a two-component Bose-Einstein condensate (2CBEC) of 87 Rb atoms prepared in the internal states |1〉≡| F =1, m F =−1〉 and |2〉≡| F =2, m F =1〉 for the precision measurement of the interspecies scattering length a 12 with a relative uncertainty of 1.6×10 −4 . We show that in a cigar... [Phys. Rev. A 87, 053614] Published Mon May 20, 2013
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
    Electronic Resource
    Electronic Resource
    Shape of the Cu(2) NQR spectra in YBa2Cu3O7, TmBa2Cu3O7 and TmBa2Cu4O8 (1997)
    Springer
    JETP letters 66 (1997), S. 624-629 
    Details
    ISSN: 1090-6487
    Keywords: 76.60.Gv ; 74.72.Bk ; 74.72.Yg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a study of shape of the Cu(2) NQR spectra in YBa2Cu3O7, TmBa2Cum3O7, and TmBa2Cu4O8 compounds at temperatures of 4.2–300 K. The results of the quantitative analysis lead us to conclude that the shape of the Cu(2) NQR spectra in all the samples studied can be described in the framework of the “motional narrowing” model, which implies that the Cu(2) nucleus possesses two different NQR frequencies between which it can rapidly jump. The difference in frequencies seems to be related to the charge-stripe correlations in CuO2 planes resulting in a dynamical modulation of the electric field gradients at the Cu(2) nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567612
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  • 4
    Electronic Resource
    Electronic Resource
    Stripe motion in CuO2 planes of Y1−x Pr x Ba2Cu3O7 as observed from the Cu(2) quadrupole resonance (1997)
    Springer
    JETP letters 65 (1997), S. 821-827 
    Details
    ISSN: 1090-6487
    Keywords: 61.72.Hh ; 74.72.Bk ; 74.80.−g ; 76.60.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The NQR spectra of copper in the compounds YBa2Cu3O7, TmBa2Cu3O7, and Y0.9Pr0.1Ba2Cu3O7 at temperatures of 4.2–200 K are investigated by a pulsed NQR technique at frequencies of 28–33 MHz. Quantitative analysis of the spectra shows that the shape of the “plane” Cu(2) spectra is well described by using a model of 1D correlations of the charge and spin distribution in the CuO2 planes (stripe correlations). In the undoped superconductors the charge-spin stripe structure moves fast in the CuO2 planes, but doping the YBa2Cu3O7 lattice with praseodymium slows this motion down.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567452
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  • 5
    Electronic Resource
    Electronic Resource
    Antiferromagnetism in hydrated 123 compounds (1999)
    Springer
    JETP letters 69 (1999), S. 792-797 
    Details
    ISSN: 1090-6487
    Keywords: 74.72.Bk ; 74.25.Ha ; 75.50.Gg ; 76.60.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Copper nuclear quadrupole resonance and zero-field nuclear magnetic resonance (ZFNMR) studies of YBa2Cu3O6.5 show that a magnetic phase appears in underdoped 123 superconductors treated in ambient moist air. The studies give convincing evidence that the “empty” CuO chains play the role of easy water insertion channels. The reaction occurs first in ordered regions of the crystallites. The final product of the reaction is a nonsuperconducting antiferromagnetic compound characterized by at least two types of magnetically ordered copper ions, with ZFNMR spectra in the frequency ranges 46–96 and 96–135 MHz, respectively. Even for powder samples fixed in an epoxy resin, this reaction is found to have partially occurred after a few years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568092
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  • 6
    Electronic Resource
    Electronic Resource
    Comparative studies of the NMR of thulium in Tm123 and Tm124 compounds: Evidence for structural and electronic phase separation (1996)
    Springer
    JETP letters 64 (1996), S. 398-403 
    Details
    ISSN: 1090-6487
    Keywords: 61.72.Hh ; 74.72.Bk ; 74.80.Bj ; 76.60.Lz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear magnetic relaxation of 169Tm in TmBa2Cu3O6+x (x=0.1–1.0, Δ x=0.1) and TmBa2Cu4O8 is studied at temperatures below 5 K. In all the samples, the Tm spin-lattice relaxation proceeds via intrinsic paramagnetic centers (PCs) like Cu2+ or copper-oxygen spin-polarized clusters. The experimental data for TmBa2Cu3O6+x support the idea of the structural (chemical) micro-phase separation in oxygen-deficient 123 compounds. Apparently, the samples with x⩾0.4 contain hole-poor nonsuperconducting regions, enriched with PCs, and hole-rich (PC-poor) superconducting regions. The volume fraction f n of the PC-rich phase reaches a maximum value of 0.85 at x=0.4 and decreases monotonically with increasing x (f n=0.5, 0.3, and 0.25 at x=0.5, 0.6, and 0.7, respectively). The Tm spin-lattice relaxation in the underdoped TmBa2Cu4O8 compound indicates that this sample, in contrast to oxygen-deficient TmBa2Cu3O6+x , has a homogeneous composition. However, the Tm spin-spin relaxation measurements reveal two sorts of the Tm nuclear spins in Tm124, having different NMR spectra and different relaxation times T 2. The latter result is evidence of electronic phase separation in CuO2 phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567210
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  • 7
    Electronic Resource
    Electronic Resource
    Anomalies of Glass Transition: Manifestation in fullerene core polystyrene stars (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 23-31 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; fullerene ; glass transition ; star-like polystyrene ; segmental dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Segmental dynamics around Tg in the 4- and 6-arm fullerene (C60) core star-like polystyrenes with different preset arm lengths was studied by DSC as compared to that in the linear PS and PS/C60 blend. The ‘anomalies’ in glass transition behavior were found for the stars including both suppression and facilitation of segmental motion, and pronounced dynamic heterogeneity within a transition range. The results are interpreted in terms of breakdown of intermolecular cooperativity of segmental motions and PS-C60 interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010163307598
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  • 8
    Electronic Resource
    Electronic Resource
    DSC investigation of oxygen subsystem in Ba-Y-Cu-O superconductors (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1123-1137 
    Details
    ISSN: 1572-8943
    Keywords: Ba-Y-Cu-O superconductor ; DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für eine Reihe von Verbindungen der allgemeinen Formel Ba2YCu3Oy und einem Sauerstoffgehalt vony=6.0....6.9 wurden mittels verschiedener Wärmebehandlungen bei 800–1200 K, gefolgt durch Abschrecken oder beim chemischen Sauerstoffentzug durch Einbringen der Probe in Diwasserstoff bei 470–490 K DSC-Untersuchungen durchgeführt. Wird die Probe in Stickstoff erhitzt, so behält sie ihren Sauerstoffgehalt bei und zeigt bei 450–850 K einen exothermen Effekt. Es wurde gezeigt, daß die Funktion ΔH(y) bei etwa y=6.5 ein Maximum erreicht. Kinetische Messungen zeigen, daß für diesen Effekt die diffusive Beweglichkeit der Sauerstoffatome im Gitter verantwortlich ist.
    Notes: Abstract DSC investigations have been performed for a series of compounds Ba2YCu3Oy with the oxygen content varying in the rangey=6.0...6.9 by means of various heat treatments at 800–1200 K followed by quenching, or through the chemical extraction of oxygen by placing the sample in dihydrogen at 470–490 K. The sample preserving a constant oxygen content during heating in nitrogen exhibited exothermal effects between 450 and 850 K. It has been shown that the ΔH vs. y function reaches maximum aty ≈ 6.5. Kinetic measurements have shown that the diffusive mobility of oxygen atoms in the lattice is responsible for these effects, viz. the Arrhenius and cooperative processes of reorganization in the non-equilibrium oxygen subsystem of the bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979174
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  • 9
    Electronic Resource
    Electronic Resource
    Enhanced chemiluminescence reaction applied to the study of horseradish peroxidase stability in the course of p-iodophenol oxidation (1997)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 12 (1997), S. 299-308 
    Details
    ISSN: 0884-3996
    Keywords: enhanced chemiluminescent reaction ; horseradish peroxidase ; enzyme inactivation ; p-iodophenol ; free radical ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The enhanced chemiluminescence reaction (ECL) was applied to the study of horseradish peroxidase (HRP) inactivation during the oxidation of p-iodophenol. Enzyme inactivation was shown to be the main reason for light decay in the course of the reaction. No individual effect of luminol and p-iodophenol as enhancer on HRP activity towards 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) was detected, enzymatic activity loss was detected only in the course of the ECL reaction. HRP activity towards ABTS (a colorimetric substrate) fell in a similar manner to the decay in light emission. The reactive radical species formed during enhancer oxidation were suggested as the main inactivating agents. The similarity of changes in light intensity and enzymatic activity allows one to apply the ECL reaction for testing potential stabilizers of HRP. The loss of enzyme activity can be partially explained by non-specific interaction of radical species with protein globule. The addition of bovine serum albumin provided almost complete protection of peroxidase from inactivation. This confirms the non-specific inactivation with highly reactive endogenous intermediates through the modification of a protein globule. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Chemiluminescent biosensors with immobilized peroxidaseThis work is published as a supplementary paper to the 9th International Symposium on Bioluminescence and Chemiluminescence. It has not been peer reviewed. (1997)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 12 (1997), S. 33-36 
    Details
    ISSN: 0884-3996
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: No Abstract
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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