Materials Literature
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Abstract The Sanchez‐Lacombe equation of state was used to model the sorption of high‐pressure gases into solid, amorphous polymers and molten polymers. Only one adjustable parameter per binary pair, δ 12 , was used in the mixing rules to correct the deviation of the characteristic pressure of the mixture, P 12 * , fr…
The mobility of foams in porous media is dominated by foam texture (i.e., foam bubble size). The effect of bubble size can be incorporated into a reservoir simulator by adding balances on the number density of bubbles in flowing and stationary foam to the equations of mass, momentum, and energy conservation. These bal…
Abstract Average advancing and receding contact angles made against cotton and glass fibers by a set of probe liquids are determined using the Wilhelmy technique. The dispersive and polar components of the surface energy are calculated from the measured contact angles using both the geometric and the harmonic mean met…
The stoichiometric complex formed between human leukocyte elastase and a synthetic MeO-Suc-Ala-Ala-Pro-Val chloromethyl ketone inhibitor was co-crystallized and its X-ray structure determined, using Patterson search methods. Its structure has been crystallographically refined to a final R value of 0.145 (8.0 and 2.3 A…
Diamond-like carbon films have been deposited onto clean, unseeded substrates using a hybrid ion beam technique. In this method the ion fluences available for acceleration were particularly enhanced by the use of laser ablation plumes ejected from highly purified graphite targets. The combination of levels of purity c…
We report frequency-dependent measurements of the specific heat ${c}_{p}$ thermal conductivity $\ensuremath{\kappa}$ of ${(o\ensuremath{-}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\mathrm{l})}_{1\ensuremath{-}x}{(o\ensuremath{-}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\ma…
A field-effect transistor structure is used to study the transport properties of the soluble conductive polymer, poly(3-hexylthiophene). We have measured conductance, mobility, and carrier concentration in undoped polymer thin films. The field-effect mobility was found to be 10−5–10−4 cm2/V s at room temperature. The…
The magnetic properties of five different microstructures of AISI 4140 steel are measured as a function of compressive plastic deformation. Coercivity, hysteresis loss, remanence, permeability, differential permeability, and anhysteretic magnetisation are determined for strains of up to 10%. Coercivity, hysteresis los…
The intrinsic magnetic material parameters of the 2: 17 type matrix phase and the 1: 5 type precipitation phase in sintered multiphase Sm(Co0.68Cu0.08Fe0.22Zr0.02)7.6 permanent magnets are determined in the whole ferromagnetic temperature regime between 10 K and Tc = 1070 K. Magnetization curves measured parallel and…
The interaction of surface plasmons with surface-optical-phonon modes in the presence of an external dc magnetic field, neglecting the retardation effect, has been studied to investigate the factors which may influence the coupling between the two waves in III-V polar semiconductors. It has been found that the couplin…
The time and temperature dependence of the specific heat of glasses is considered in light of an analytic form for the density-of-states function of two-level systems, N(E), which has recently been calculated. It is shown that experimentally observed time and temperature dependences are explainable with this function…
A structural investigation by x-ray diffraction is presented on ionic conducting glasses of composition (AgI)x (AgPO3)1−x, with x=0.0, x=0.45, and x=0.55. The radial distribution functions of the AgI-doped glasses, calculated from the experimental diffracted intensities, are dominated by a peak centered at about 2.80–…
Refinement and thin film synthesis methods were used by members of six different institutions to design antireflection coatings for germanium substrates. The solutions are based on the use of zinc sulfide and germanium layers only. Several systems were found with an average reflectance that is less than 1% in the 7.7…
The origin and characteristics of the field-off state optical properties of the general twisted nematic liquid-crystal displays (LCD) are discussed. The optical field propagating normally in a uniformly twisted nematic structure can be represented by two mutually orthogonal elliptically polarized normal modes, one wit…
The dynamic structure factor S(q,\ensuremath{\omega}) of electrons in highly oriented pyrolytic graphite for q\ensuremath{\parallel}c and q\ensuremath{\perp}c with 0.37<q<2.06 a.u. was measured at 0.8 eV resolution by inelastic scattering of synchrotron x radiation. The energy-transfer regions both of interband…
We present a Landau theory of the martensitic structural phase transformation undergone by bcc Li into the 9R phase. We propose that the transition occurs via incomplete softening of the ((1/3 1) /3 0) ${\ensuremath{\Sigma}}_{4}$ phonon. Even though this branch does not soften to zero frequency (or even close to zero…
We generalize the Fibonacci Penrose tiling to three classes of one-dimensional, two-tile Penrose tilings which can be obtained geometrically as well as recursively. From a numerical study of their spectral properties, we conclude that the Fibonacci case has the generic features of all three classes. As a model of epit…
We present a valence effective Hamiltonian (VEH) nonempirical investigation of the electronic properties of metal-free phthalocyanine. The valence one-electron energy levels are related to those of the phthalocyanine components: benzene, pyrrole, and isoindole. From the electronic structure standpoint, phthalocyanine…
Mean electronic resonant wavelength of some single substance liquid crystals obtained by ultraviolet transmission spectrum and by wavelength dependent birefringence agrees very well. Both ground and higher state π→π* electronic transitions are found to make a major contribution to the observed birefringence of those l…
Phase transitions of the linear-chain semiconductor (${\mathrm{NbSe}}_{4}$${)}_{3}$I, which occur successively at ${T}_{c1}$=271 K and ${T}_{c2}$\ensuremath{\simeq}100 K, were studied by Raman scattering and electrical resistivity. The resistivity data showed that the band gap increases below ${T}_{c1}$. It was found…