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  • 1
    Electronic Resource
    Electronic Resource
    Effect of size and dimensionality on the magnetic moment of transition metals (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4484-4486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of size and dimensionality on the magnetic moments of Fe, Co, and Ni have been studied theoretically by confining the atoms to various structural forms such as chains, surfaces, and thin films. The size of these systems is controlled by limiting the number of atoms. A new first-principles theory is developed that enables us to study the electron spin density of states and moments of atoms in clusters containing two to a few thousand atoms. The theory is based upon the elementary principles governing the tight binding and linear combination of atomic orbitals formulations. It contains no adjustable parameters and can be applied to systems with or without topological symmetry. We have discovered quantum size effects on the magnetic moments of linear chains and these effects disappear when the chains contain more than 20 atoms. We have also found distinct effects of the local environment on the magnetic moment. For example, the moments increase with decreasing coordination number and increasing interatomic distance. Our results will be compared with available experimental and theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344889
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of absolute polydispersity and molecular weight distribution of high molecular weight polymers from dynamic light scattering (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 673-681 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Intensity correlation function obtained from dynamic light scattering (DLS) experiments has been theoretically analyzed within the framework of the Schulz molecular weight distribution. The correlation function has been expanded about the mean molecular weight instead of the average linewidth as is normally done in cumulant analysis. This allows the explicit determination of polydispersity (Z). In addition to this, it has been shown that the molecular weight exponent of diffusion coefficient ν, occurring in the Mark–Houwink equation DM−ν and the average molecular weight M¯, can in principle be determined from DLS data. Finally, from the knowledge of Z and M¯ it is possible to construct the Schulz molecular weight distribution function. Experiments performed on three model systems, polystyrene in cyclohexane at 35 °C (θ system), polystyrene in toluene at 20 °C (good system), and latex beads in a deionized aqueous medium (hard spheres system), provide excellent matching between the experimental data and results obtained using our proposed method of analysis of DLS studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465739
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  • 3
    Electronic Resource
    Electronic Resource
    Light scattering observation of spinodal line in gelatin gels (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3568-3570 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Light scattering measurements have been performed on dilute gelatin gels to determine the spinodal curve through Tanaka's mean-field approach of density fluctuations in gels. The spinodal zone has been found to be much below the sol–gel transition line determined through differential scanning calorimetry measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464080
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  • 4
    Electronic Resource
    Electronic Resource
    Managing Asthma Within the Context of the Rural Family (2001)
    Oxford, UK : Blackwell Science Inc
    Public health nursing 18 (2001), S. 0 
    Details
    ISSN: 1525-1446
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this qualitative study was to describe the experiences of rural families caring for children with asthma. The chief caregivers from six rural families were interviewed about the family's daily experiences in living with asthma, their knowledge of asthma triggers, and strategies for managing asthma. Parental knowledge about asthma and asthma management strategies was quite good. The cost of asthma regimens and school policies about medications were major barriers to better control. Other management strategies were directed at maintaining normality of family life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1525-1446.2001.00385.x
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular view of the interfacial adhesion in aluminum-silicon carbide metal-matrix composites (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2308-2310 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The binding energies, electron charge transfer, bond lengths, and core level shifts of Al-Al, Al-Si, Al-C, and Si-C dimers have been calculated self-consistently using the linear combination of atomic orbitals-molecular orbital theory. The exchange interactions are treated using the unrestricted Hartree–Fock theory and correlation corrections are included through the Möller–Plesset perturbation scheme up to fourth order. The results are used to understand the nature and strength of bonding at the interface of Al and SiC crystals. The strong bonding of Al-C dimers compared to Al-Al and Al-Si is shown to be responsible for the aluminum carbide formation at the interface. The charge transfer between the constituent atoms in the dimer and the accompanying core level shifts are also shown to be characteristic of what has been observed at the Al/SiC interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103878
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  • 6
    Electronic Resource
    Electronic Resource
    Dipole scattering in polarization induced III–V nitride two-dimensional electron gases (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4734-4738 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Unusually large spontaneous and piezoelectric fields in the III–V nitrides have led to the making of an entirely new class of two-dimensional electron gas. Fluctuation from a perfectly periodic binary structure in highly polar semiconductor alloys present the same physical situation as a random distribution of microscopic dipoles. The excess dipole distribution in the barrier layers is evaluated by a method similar to the virtual crystal approximation. It is shown that the mobility of electrons in the two-dimensional electron gas formed in highly polar heterostructures is intrinsically limited by scattering from such dipoles. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311832
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum chemical study of adhesion at the SiC/Al interface (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6246-6253 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the intermediate neglect of differential overlap approximation, the total energies of a number of clusters modelled to represent the SiC/Al interface have been calculated as a function of distance separating the two surfaces of SiC and Al. The adhesive energy of the interface is calculated by minimizing the total energies corresponding to various crystallographic orientations of the SiC and Al surfaces. The results are used to provide semiquantitative understanding of the bonding mechanism and the effect of reconstruction at the SiC/Al interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342082
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of scattering by strain fields surrounding edge dislocations on electron transport in two-dimensional electron gases (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 64-66 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a theory of deformation potential carrier scattering of two-dimensional electron gases from the strain fields surrounding edge dislocations. The scattering rate is evaluated in closed form without any fitting parameters. The result is directed towards understanding mobility limiting scattering mechanisms for two-dimensional electron gases at AlGaN/GaN heterointerfaces. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1429758
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  • 9
    Electronic Resource
    Electronic Resource
    Dislocation scattering in a two-dimensional electron gas (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1707-1709 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theory of scattering by charged dislocation lines in a two-dimensional electron gas (2DEG) is developed. The theory is directed towards understanding transport in AlGaN/GaN high-electron-mobility transistors which have a large number of line dislocations piercing through the 2DEG. The scattering time due to dislocations is derived for a 2DEG in closed form. This work identifies dislocation scattering as a mobility-limiting scattering mechanism in 2DEGs with high dislocation densities. The insensitivity of the 2DEG (as compared to bulk) to dislocation scattering is explained by the theory. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126143
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  • 10
    Electronic Resource
    Electronic Resource
    VISCOELASTIC CHARACTERIZATION OF RICE GEL (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of texture studies 34 (2003), S. 0 
    Details
    ISSN: 1745-4603
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Rice flour dispersions with 15–25% solids were subjected to microwave heating for 0–75 s and samples were subjected to oscillatory frequency sweep between 0.01–10 Hz. The initial rapid increase in storage modulus (G1) with frequency decreased to a plateau at higher frequencies. An increase in G1 and complex viscosity (η*) with an increase in the time of treatment or concentration of solid indicate the extent of sol-gel transformation. The sensory data on hardness, elasticity and stickiness also followed similar trend. Principal component analysis (PCA) of the sensory results indicate that a minimum treatment time of 45 s is needed to achieve a rice gel with acceptable sensory characteristics. The G' values were modeled (0.936 ≤ r ≤ 0.988, P ≤ .01) by the 4-element spring-dashpot model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4603.2003.tb01068.x
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