Materials Literature
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The near-surface nucleation and crystallization behavior of Ag+ ion-implanted lithia-alumina-silica glasses has been studied. For room-temperature Ag implants, crystallization of the glass ceramic phase was prevented by dissolution of Ag precipitates and migration of Ag atoms at temperatures below that necessary for f…
Electron dense markers of a size suitable for transmission electron microscopy and scanning electron microscopy have been prepared with gold granules labeled with a monolayer of specific macromolecules. The optimum conditions for preparing the markers have been ascertained. The method is simple, rapid and seems to be…
Abstract Nickel complexes (NiCl2 (2,2′-bipyridine) and NiBr2(triphenylphosphine)2) catalyze polycondensation of di- and polyhalogenated aromatic compounds including p-dibromobenzene, p-dichlorobenzene, m-dichlorobenzene, bis (4-bromophenyl)ether, p-chlorobenzyl chloride and 1,3,5-trichlorobenzene by dehalogenation wit…
<p>This study investigated possible similarities between the ability to identify pitches and the ability to identify loudnesses. Systematic training of musically naive subjects indicated that frequency identification performance improves at about the same rate as intensity identification performance. Examination…
Solubility isothe nns of hydroxyapatite, Ca5(PO.h OH (OHAp) , pre pa red by titrating a boiling aqueous suspe nsion of Ca(O HJ, with 0 .5 M H3PO., we re detennined in the te rnary system Ca(OHJ,-H3PO.-H20 at 5, 15, 25, a nd 3 7 C in the pH ra nge 3 .7-6. 7 by equilibration with dilute H3PO. solutio ns. The solubility…
Principles and Techniques of Electron Microscopy has established itself as a standard book for biological electron microscopists wishing to learn how to prepare their specimens for electron microscopic investigation. This fully revised and expanded 4th edition includes three new chapters covering such topics as immuno…
Abstract Samples of isotactic polypropylene (PP) were zone‐solidified in temperature gradients up to 300°C/cm at growth rates down to 3 μm/min. Oriented α‐type spherulites were obtained only by nucleation. While β nucleation is extremely rare, the β phase is easily initiated by growth transformations along the oriente…
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…