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  • Chemistry  (7)
  • Surface physics, nanoscale physics, low-dimensional systems  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Polarized raman scattering from oriented single microcrystals of d(A5T5)2 and d(pTpT) (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 493-507 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarized Raman spectra have been obtained from single microcrystals of the duplex of the decamer d(A5T5)2 using a Raman microscope. This is the first report of Raman spectra from a crystal of a deoxyoligomer that contains only long, nonalternating sequences of adenine and thymine. Sequences containing d(A)n and d(T)n are of interest in view of recent suggestions that they induce bends in DNA and that they might exist in a nonstandard B-conformation. Polarized Raman spectra of a crystal of d(pTpT) have also been obtained. Both crystals display Raman bands whose intensities are very sensitive to the orientation of the crystal with respect to the direction of polarization of the incident laser beam. These spectra indicate that the helical axes of the oligonucleotides are parallel to the long axes of the crystals and that the d(A5T5)2 is not appreciably bent in the crystal. The Raman spectrum from the d(pTpT) crystal indicates that all of the furanose ring puckers are in a C2′-endo configuration since only the C2′-endo marker band at 835 ± 5 cm-1 is present. Crystals of d(A5T5)2 show measurable Raman intensities in both the 838- and 816-cm-1 bands. This indicates the presence of both the C2′-endo and C3′-endo, or possibly other non-C2′-endo, furanose conformations. The 816-cm-1 band is weak so that only a small fraction of the residues are estimated to be in the non-C2′-endo conformation. In both the d(pTpT) and d(A5T5)2 crystals the intensity of the bands due to vibrations of the backbone show only a small dependence on orientation of the crystals. This result is explained by the low symmetry of the puckered sugar rings. It is concluded that Raman spectra obtained from oligonucleotide crystals in which the orientation of the crystal axes to the laser polarization is not carefully controlled may contain intensity artifacts that are due to polarization effects.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360270310
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Theory and operational characteristics of the magnetic valve for solids Part II: Collar designG. Zhang is on leave from East China Institute of Chemical Technology, Shanghai, China; E. Jaraiz-M., from Departamento de Quimica Tecnica, University of Salamanca, Spain; and Y. Wang, from the Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, China. (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 959-966 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper reports on the operating characteristics of the collar type MVS which uses either orifice plates or screens as supports for the solids.The optimum placement for the support (screens or orifice plates), the current needed to operate the valve as a function of vessel size (up to 0.55 m) and screen or orifice opening, and the response characteristics of the valve were all determined. These findings were then compared with theory.Finally, the operational characteristics of the MVS (magnetic valve for solids) when handling a mixture of magnetic and nonmagnetic solids were briefly examined.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300611
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  • 3
    Electronic Resource
    Electronic Resource
    Theory and operational characteristics of the magnetic value for solids: Part I: Grate designE. Jaraiz-M. is on leave from Departamento de Quimica Tecnica, University of Salamanca, Spain; Y. Wang, from The Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, China; and G. Zhang, from East China Institute of Chemical Technology, Shanghai, China. (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 951-959 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The operational characteristics of the grate-type MVS with screen were studied in detail. First, theory was developed to predict how the current needed to operate the valve was related to the valve geometry. Then experiments were made to see how bed height, screen aperture, grate spacing, the presence of nonmagnetic solids in the mixture all affected the current needed to operate the valve and on the mass flux of solids. The response time of the valve was also determined.The experiments were compared with the predictions of the theory.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300610
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  • 4
    Electronic Resource
    Electronic Resource
    Non-linear resonance conditions and their relationships to higher multipole fields in ion traps and quadrupole mass filters (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 920-928 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Deviations of electrode shapes from pure quadrupole systems result in the superposition of higher multipole fields onto the quadrupole field. Non-linear resonances are generated due to these higher multipole fields. These non-linear resonances can be thought of as internal resonances, which must fulfil appropriate conditions. In this paper, general non-linear resonance conditions for a time-variable, three-dimensional, non-linear quadrupole system are derived, using previously described methods. The occurrence of resonances depends on the electrode shapes of the non-linear quadrupole systems which control the weight factors of the higher multipole fields. With special electrode shapes, for example shapes with symmetry, the resonance effects are reduced. Different higher multipoles (for example, octopoles and dodecapoles) generate non-linear resonances which fulfil different and/or the same resonance conditions. Each resonance condition can be described by resonance lines within the stable regions of the stability diagram. Resonant ion motion possesses the characteristic that groups of ion frequencies are simultaneously resonant. These properties are analyzed and corresponding results are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071013
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and X-ray characterization of double oxides of the formula Cr1-xW1+xO4 (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 569 (1989), S. 153-157 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und röntgenographische Charakterisierung von Doppeloxiden der Formel Cr1-xW1+xO4Mixed-Valenz-Verbindungen der Formel Cr1-xW1+xO4 wurden bei 1300°C dargestellt. Aus Röntgenbeugungsdiagrammen konnten drei verschiedene Phasen identifiziert werden, eine vom Rutiltyp für 0,40 ≤ x ≤ 0,50 und zwei andere mit Rutil-ähnlichen Strukturen bzw. vom CrWO4-Typ für 0 ≤ x ≤ 0,25 und vom WO2-Typ für 0,80 ≤ x ≤ 1.
    Notes: Mixed valency compounds of formula Cr1-xW1+xO4 have been prepared at 1300°C. Three phases have been identified by X-ray diffraction: one of rutile type for 0.40 ≤ x ≤ 0.50 and two others with rutile-related structures, i. e. of CrWO4-type for 0 ≤ x ≤ 0.25 and of WO2-type for 0.80 ≤ x ≤ 1.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895690116
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  • 6
    Electronic Resource
    Electronic Resource
    Saturation effects on ultraviolet resonance Raman intensities: Excimer/YAG laser comparison and aromatic amino acid cross-sections (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 435-440 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Substantial saturation effects are noted for resonance Raman (RR) bands of the aromatic residues in cytochrome c (excited at 230 nm) with an H2 Raman-shifted YAG or a frequency-doubled excimer-pumped dye laser. At a given average power, saturation is much lower for excimer than for YAG excitation because of the longer pulse and higher repetition rate of the excimer laser. The signal quality at low average power is significantly higher for the excimer-excited spectra. Ultraviolet RR cross-sections have been redetermined for aqueous phenylalanine, tyrosine and tryptophan at a series of wavelengths from 240 to 192 nm. The excimer laser was used at 209 nm and longer wavelengths, and in addition deconvolution techniques were applied to better define the individual RR bands. These improvements led to quantitative changes in the cross-section values from those reported previously, but the interpretation of the excitation profiles in terms of excited-state properties of the aromatic residues remains unchanged.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210709
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  • 7
    Electronic Resource
    Electronic Resource
    Surface-enhanced Raman scattering of CO2 dissolved in aqueous colloidal solutions of silver and gold (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 959-962 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The observation of surface-enhanced Raman scatterings (SERS) from CO2 molecules dissolved in aqueous solutions of silver and gold colloids measured with 850 nm near-IR excitation is reported. Different types of surface enhancement and surface-enhanced Raman spectra were observed. The SERS spectrum of CO2 on colloidal gold is in good agreement with the spectrum of CO2 dissolved in water. Two different types of SERS spectra were found for CO2 on colloidal silver. They can be assigned to physisorbed and/or weakly chemisorbed CO2 molecules and to strongly bonded CO2 - negatively charged surface radicals, respectively. The enhancement factor for the stretching mode of carbon dioxide is estimated to be of the order of 102-104, depending on the kinds of metal and types of adsorption, which demonstrates that SERS on colloidal silver or gold particles in solution offers possibilities for detecting CO2 dissolved in liquids at low concentrations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250261006
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  • 8
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    Feedback-optimized extraordinary optical transmission of continuous-variable entangled states (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-03-13
    Description: Author(s): Dong Wang, Chuanqing Xia, Qianjin Wang, Yang Wu, Fang Liu, Yong Zhang, and Min Xiao We report on the feedback-optimized extraordinary optical transmission of continuous-variable entangled states through a hexagonal metal-hole array. The continuous-variable entanglements from a nondegenerate optical parametric amplifier are first demonstrated to survive after a photon-plasmon-photon... [Phys. Rev. B 91, 121406] Published Thu Mar 12, 2015
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Resonant bonding driven giant phonon anharmonicity and low thermal conductivity of phosphorene (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-10-27
    Description: Author(s): Guangzhao Qin, Xiaoliang Zhang, Sheng-Ying Yue, Zhenzhen Qin, Huimin Wang, Yang Han, and Ming Hu Two-dimensional (2D) phosphorene, which possesses fascinating physical and chemical properties distinctively different from other 2D materials, calls for a fundamental understanding of thermal transport properties for its rapidly growing applications in nano- and optoelectronics and thermoelectrics.… [Phys. Rev. B 94, 165445] Published Wed Oct 26, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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