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The supermolecular structure and viscoelastic and diffusion properties of a perfluorinated polymer containing sulfonic acid (Nafion) were investigated. The breakdown of time–temperature super-position for the dry salt and and acid in the presence of 0.5 H2O/SO3H as well as the results of small-angle x-ray scattering s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVelocity-Voidage Relationships for Fluidization and Sedimentation in Solid-Liquid SystemsJohn Garside and Maan R. Al-DibouniCite this: Ind. Eng. Chem. Process Des. Dev. 1977, 16, 2, 206–214Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Pu…
Constraints that may be applied to the spin orbitals used in Hartree–Fock theory are classified and discussed. Once a constrained stationary wavefunction has been obtained by a self-consistent procedure, it may be tested for stability both internally (with constraints remaining) and externally (with some constraints r…
The types of compounds in the A2O3– B2O5 systems, where A = the p-, d-, and f-elements of Group III, the p-elements of Group V, and the d-elements of the fourth period in the tervalent state and B=Nb or Ta, are considered. An analysis of the methods of making the niobates and tantalates is given, their structure is de…
Fifteen different electron traps have been characterised in v.p.e., l.p.e., m.b.e. and bulk-grown GaAs from d.l.t.s. experiments. An accurate description of each level is given, and allows a fruitful comparison with fragmentary previous data. A catalogue of these electron traps is provided as a working tool.
Dry proteins are dead, or at best asleep. Substitution of D2O can drastically alter biological activity. Water is thus essential in maintaining the structural integrity of biologically active macromolecules, and is implicated in their functioning. Such water may occupy a range of dynamical states, from being strongly…
The behaviour of the shear viscosity near the critical point in fluids is discussed. The values of the critical exponents obtained by analysing available experimental data from the view point of multiplicative renormalization of transport coefficients are shown to be in a very good agreement with the theoretical resul…
After irradiation with infrared and visible light as 20K WO 3 single crystals show ESR attributable to W 5+ (5d 1 ) electrons trapped as polarons at lattice sites of the low-temperature WO 3 structure.
The photovoltage transients of GaP were examined with the retarding-potential electron-beam technique. Systematic changes in the signal size and shape were noted as the light intensity, chopping frequency, and wavelength were independently varied. The initial rise in the photovoltage signal was linear in light intensi…
A mean-field model of a one-dimensional conductor is shown in the presence of a fixed total current to exhibit a dynamic charge-density-wave (CDW) solution which can propagate without Landau damping at a temperature higher than ${T}_{c}$, the transition temperature for the static instability. However, the free energy…
Thermal, spectroscopic, and other properties of methane solids, especially those concerning Phase II of solid CH4 in nuclear spin species equilibration, are theoretically studied from a unified point of view, i.e., the extended James–Keenan model. It assumes a rigid lattice and treats the molecular motions with respec…
The scattered electric field amplitude autocorrelation function of a dilute solution of large rigid anisotropic particles is computed in the Rayleigh–Debye approximation. The autocorrelation function for cylindrically symmetric particles is an infinite series of decaying exponentials with time constants τ−1l=q2D +l (l…
The two-dimensional energy-band structure of the layer compound InSe has been determined directly from the polar-angle dependence of its photoemission spectra. The measurements were performed using synchrotron radiation in the photon energy range 15-29 eV. The measuring system consisted of two miniature plane-mirror a…
Simple Monte Carlo multiple-trapping model simulations of the observed anomalous transit-time dispersion have been made. The model employs multiple trapping from an exponential distribution. Our results simulate the features of the experimental observations as well as provide a rational explanation for the transition…
A model is presented for the electronic properties of graphite intercalation compounds in the dilute limit, corresponding to intercalate concentrations more dilute than a stage-4 or -5 compound. In this limit, the electronic effect of intercalation in donor and acceptor compounds is modeled, respectively, as a raising…
Optical properties of polystyrene in the form of thin films were determined for photon energies between 0.6 and 82 eV from transmission measurements. The results for $k$, the extinction coefficient, were combined with previous experimental results in the soft and hard x-ray regions up to 8050 eV. Analyses were made on…
The heat capacity and resistivity at the charge-density-wave (CDW) transitions of several layered transition-metal dichalcogenides are presented. The magnitude of the thermal and resistive anomalies in the $2H$ polytypes indicates only a small fraction of the Fermi surface is involved in the CDW distortion. The transi…
Systematic x-ray photoelectron spectroscopy (XPS) measurements are reported for both core and valence electrons for oxides of the actinides thorium, uranium, neptunium, plutonium, americum, curium, berkelium, and californium. The XPS spectra of the localized $5f$ electron states were compared to the appropriate multip…
We have measured the second and third order hyperpolarizabilities of the three nitroaniline isomers and of two related molecules. For some isomers the intramolecular charge transfer is found to cause a very large enhancement of the second order polarizabilities. We present a theory relating this contribution to the fi…
The thermoluminescence glow curve of CaF 2 :Dy TLD-200 extends from room temperature up to about 450 degrees C. Dy 3+ is the main emitting centre for all the glow peaks. However, in addition to Dy 3+ emission, the glow peaks above 325 degrees C show four extrabands in the region 250-600 nm. Three of these are attribut…