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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of sintered Sm2Fe17Ny magnets (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 489-494 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sintered magnets of Sm2Fe17Ny nitrides, with a density of 6.0–7.4 g/cm3, have been prepared by using an explosion technique. Both crystalline structure and the magnetic properties of Sm2Fe17Ny nitrides were retained in the process. The sintered magnet had a remanence Br=0.83 T, an intrinsic coercivity μ0iHc=0.57 T and an energy product (BH)max=88 kJ/m3. The temperature dependence of coercivity and remanence were also measured. The temperature coefficients α of remanence and β of coercivity are −0.076%/°C and −0.51%/°C, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355258
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Self-organization of (In,Ga)As/GaAs quantum dots on relaxed (In,Ga)As films (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2164-2166 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the synthesis of (In,Ga)As/GaAs quantum dots on strain-relaxed (In,Ga)As epitaxial films. It is found that the incorporation of a relaxed prelayer provides a systematic and effective method for controlling the dot distribution and emission wavelength. The robustness of the optical properties of quantum dots to dislocations may provide a method for engineering the band structure of quantum dot devices. We demonstrate, for example, that longer band-to-band emission wavelengths can be obtained by simply decreasing the residual strain in the relaxed films. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122410
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  • 3
    Electronic Resource
    Electronic Resource
    New higher-dimensional instanton and monopole solutions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 1861-1865 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Two classes of spherically symmetric solutions to the empty space Einstein equations in even dimensions are presented. The solutions are constructed as radial extensions of circle bundles over a compact homogeneous Kähler manifold M. Type B solutions can be turned into higher-dimensional Kaluza–Klein monopoles. Both the Gross–Perry–Sorkin solution and the Bais–Batenburg solutions are contained as special cases of the general solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528272
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulations of ion clustering and conductivity in NaI/ether solutions. I. Effect of ion charge (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 8734-8745 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Model systems of sodium iodide dissolved in dimethyl ether were studied in order to investigate the structural and dynamic properties of ionic solutions in small and polymeric ethers having low dielectric constants. Full molecular dynamics simulations were performed at ion charges ranging from 0.5 to 0.1 e, and an algorithm designed to assign ions to clusters and calculate all the terms contributing to ionic conductivity was implemented. Quantitative results were obtained for the contributions of various ionic species to the conductivity. These model systems are stable for ion charges at or below 0.3 e, and a maximum in conductivity is observed at 0.3 e. A range of ion cluster sizes is observed in each system, but the current giving rise to ionic conductivity is due primarily to the movement of free ions and the relative movement of ions within loosely bound pairs. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470130
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulations of ion clustering and conductivity in NaI/ether solutions. II. Effect of ion concentration (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 8746-8755 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics simulations of sodium iodide dissolved in dimethyl ether or 1,2-dimethoxyethane (glyme) were studied at a range of salt concentrations. The interactions among the species were represented with Lennard-Jones and Coulomb forces. Dimethyl ether and glyme were represented by a rigid three-site model and a six-site model with flexible dihedral angles, respectively. Glyme is demonstrated to be a much better solvent than dimethyl ether, although both are low-dielectric solvents. At the highest concentration studied in glyme, which corresponds to an oxygen/cation ratio of 16:1, free ions make up about 50% of the total ion concentration, and neutral pairs make up about 20%. A quantitative analysis of the species important in conductivity shows that the current is primarily the result of the movement of free ions and the relative movement of ions within loosely bound ion pairs. At higher salt concentrations, many different ionic species can make contributions to the conductivity. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470131
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of a novel Pr-Fe-Ti phase : 38th Annual Conference on Magnetism an Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7120-7121 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a systematic study of the (Pr1−xTix)Fe5 alloy series, the (Pr0.65Ti0.35)Fe5 alloy has been found to have a dominant phase with either the rhombohedral Th2Zn17 structure or the newly discovered Nd2(Fe,Ti)19 (S. J. Collocott, R. K. Day, J. B. Dunlop, and R. L. Davis, in Proceedings of the Seventh International Symposium on Magnetic Anisotropy and Coercivity in R-T Alloys, Canberra, July 1992, p. 437) structure, depending on the annealing procedure. Powder-x-ray-diffraction patterns and scanning electron microscopy show that the sample annealed at a temperature of 850 °C followed by 1000 °C has the 2:17 structure whereas annealing at 1000 °C directly leads to the new 2:19 structure. Energy-dispersive x-ray analysis yields Pr:Fe:Ti ratios of 10.7:86.2:3.1 for the Pr2(Fe,Ti)17 phase and 9.2:85.9:4.9 for the Pr2(Fe,Ti)19 phase. 57Fe Mössbauer spectroscopy (at 295 K) gives values for the average 57Fe hyperfine field of 15.7 T for the 2:17 phase and 17.5 T for the 2:19 phase, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356698
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  • 7
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    Sensors, Vol. 13, Pages 7492-7504: Direct Electrochemistry of Hemoglobin at a Graphene Gold Nanoparticle Composite Film for Nitric Oxide Biosensing (2013)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2013-06-08
    Description: A simple two-step method was employed for preparing nano-sized gold nanoparticles-graphene composite to construct a GNPs-GR-SDS modified electrode. Hemoglobin (Hb) was successfully immobilized on the surface of a basal plane graphite (BPG) electrode through a simple dropping technique. Direct electrochemistry and electrocatalysis of the hemoglobin-modified electrode was investigated. The as-prepared composites showed an obvious promotion of the direct electro-transfer between hemoglobin and the electrode. A couple of well-defined and quasi-reversible Hb CV peaks can be observed in a phosphate buffer solution (pH 7.0). The separation of anodic and cathodic peak potentials is 81 mV, indicating a fast electron transfer reaction. The experimental results also clarified that the immobilized Hb retained its biological activity for the catalysis toward NO. The biosensor showed high sensitivity and fast response upon the addition of NO, under the conditions of pH 7.0, potential ‒0.82 V. The time to reach the stable-state current was less than 3 s, and the linear response range of NO was 0.72–7.92 μM, with a correlation coefficient of 0.9991.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 8
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    An in-situ study of magnetic domain structures in undercooled Fe-29.5 at. %Pd magnetostrictive alloys by Lorentz microscopy and electron holography (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-04-25
    Description: Understanding of correlation between magnetic domain structure and functional properties is of importance for the magnetic field driven phase transition (e.g., martensitic transformation) or microstructure variation (e.g., twin boundary motion) materials. In this work, we report a Fe-29.5 at. %Pd shape memory alloy treated by undercooling processing upon a degree of 320 K below the liquid temperature. The effect of high undercooling on the solidified microstructure and martensitic transformation temperatures was investigated. By in-situ Lorentz transmission electron microscopy and electron holography, magnetic domain structure and the field-induced domain wall motion behavior in as-cast and undercooled samples have been schematically studied. The irregular domain structure can be observed in these alloys. On the application of a field up to 300 Oe, the domain walls for both samples are able to move along the direction of the external magnetic field, but structural transition and rearrangement of variants are not observed in the undercooled alloy. The large magnetostriction of Fe-29.5 at. %Pd undercooled alloy originates from the irregular domain walls motion instead of the rearrangement of martensitic twin variants.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    A Novel Model of Set Pair Analysis Coupled with Extenics for Evaluation of Surrounding Rock Stability (2015)
    Hindawi
    Details
    Publication Date: 2015-09-28
    Description: The evaluation of surrounding rock stability is a complex problem involving numerous uncertainty factors. Here, based on set pair analysis (SPA) coupled with extenics, a novel model, considering incompatibility, certainty, and uncertainty of evaluation indicators, was presented to analyze the surrounding rock stability. In this model, extension set was first utilized to describe the actual problem of surrounding rock stability. Then, the connectional membership degree of the set pair was introduced to compare the measured values with classification standards from three aspects embracing identity, discrepancy, and contrary. Also, according to identity-discrepancy-contrary (IDC) analysis in the universe of the extension set, the connection numbers were proposed to specify the connectional membership degree of an evaluation indicator to each class. Combined with the weights of evaluation indicators, integrated connectional membership degrees were calculated to determine their classes of rock stability. Finally, a case study and comparison with variable fuzzy set method, triangular fuzzy number method, and basic quality (BQ) grading method were performed to confirm the validity and reliability of the proposed model. The results show that this model can effectively and quantitatively express the differences within a group, transformation of different groups, and uncertainty of complex indicators as a whole.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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  • 10
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    Effects of strain on effective work function for Ni/HfO2 interfaces (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-13
    Description: The effective work functions for Ni/HfO 2 interfaces under two strain modes (uniaxial and triaxial strains) were studied by using first-principles methods based on density functional theory. The calculated results indicate that the effective work functions are strongly affected by the type of interface and the strain states (tensile and compressive strains). For the both above strain states, the changed value of the effective work functions linearly increases with increasing strain. Moreover, it is observed that for a certain strain, the variation of the effective work function for triaxial strain state is almost larger than that for uniaxial strain state. Finally, the electrons gas model, the interface dipole, and screening role of HfO 2 were used to analyze and explain the strain and interface effects in metal-oxide interfaces. The evident difference between the effective work functions of Ni-Hf and Ni-O interfaces is found to be attributed to different metallic bondings and ionic bondings via the analysis of the charge density distributions. Our work strongly suggests that controlling the strain and interface structure is a promising way for modulating the work function of Ni/HfO 2 interfaces.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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