Materials Literature
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The fundamental vibration–rotation spectra of condensed DT and T2 were measured. The 24 separate spectral lines identified consist mainly of QQ, QR, QQ+So(0), and QQ+So(1) transitions. The last two appear as triad sets in D2–DT–T2 solutions because of double transitions between different isotopes. The QQ frequencies a…
Pressure–volume–temperature relationships of three low-density polyethylenes are reported in the temperature range of 30°–225°C and in the pressure range of 0–2000 kg/cm2. The same materials had previously been studied by the IUPAC Working Party on Structure and Properties of Commercial Polymers with regard to basic c…
The vibrational properties of six different polytypes of Pb${\mathrm{I}}_{2}$ crystals have been studied experimentally by means of Raman spectroscopy and x-ray diffraction. The crystals were prepared either by gel growth or by thermal annealing. The Raman spectra are used to determine features of the phonon dispersio…
The vibrational and electronic spectra for the sodium mono-, di-, and trianion salts of TCNQ prepared in vacuo by solvent-free vapor codeposition methods, have been measured. These data, combined with published vibrational assignments for neutral TCNQ and the monoanion salts of TCNQ, have permitted an empirical analys…
A new method is presented for a systematic calculation of the effective dielectric constant ${\ensuremath{\epsilon}}_{e}$ of a granular, two-component composite material with a precisely known microscopic geometry. The basic approach is to attempt to calculate the poles and residues of ${\ensuremath{\epsilon}}_{e}$ as…
Ordered collagen in native, intact rat tail tendon has been studied by means of optical second harmonic generation (SHG). The two independent hyperpolarizability tensor elements of the collagen molecule, β3 and β1, have been found to be of opposite sign and roughly equal in absolute magnitude. Evidence is presented fo…
The author has considered the dynamics of the interaction of a 180 degrees ferromagnetic domain wall with a planar defect characterised by an abrupt change in both the magnetic anisotropy and exchange energies. It is shown that the minimum velocity for the soliton or domain wall to penetrate the barrier is proportiona…
The drift mobility mu d of melt-grown BaTiO 3 single crystals has been determined in the 20 degrees C to 80 degrees C temperature range, using the Spear method. At room temperature, mu d =(3+or-1)*10 -7 m 2 V -1 s -1 with a resistivity of 4*10 8 Omega m. The mobility thermally activated with an activation energy of 0.…
For pt.I see ibid., vol.10, no.9, p.1431 (May 1977). A modified form of the electron-gas approximation is proposed for the calculation of interionic potentials in the solid state. On the basis of these potentials perfect lattice and defect properties of a number of solids are calculated and compared both with experime…
Resistivity, annealing, and neutron-diffraction studies of $\mathrm{Pd}{\mathrm{H}}_{x}$ and $\mathrm{Pd}{\mathrm{D}}_{x}$ provide evidence for ordering of the H and D atoms on the octhaderal interstitial sublattice. Neutron diffraction results on a Pd${\mathrm{D}}_{0.76}$ single crystal indicate that the D atoms orde…
A phase transformation is observed in scandium metal at a pressure of approximately 170 kbar as seen from a rise of the electrical resistance by a factor of 4. The high-pressure phase (Sc II) is a superconductor. ${T}_{c}$ is found to increase with pressure from \ensuremath{\simeq} 50 mK at 186 kbar to \ensuremath{\si…
Abstract Two sets of ozonization reactions, for 1 h and 24 h respectively, have been carried out at −20°C on degraded samples of PVC having different contents of tactic sequences. The evolution of the polyene sequences distribution with the ozonization was followed by UV‐Visible spectroscopy. The number of chain sciss…
Material usages from 1900 are traced with emphasis on introduction of new materials and alloys. The historic prospective taken also extrapolates current developmental trends into the future. The paper is divided into three periods---1900-1940-THE PAST, after World War II to 1978-THE PRESENT, and THE FUTURE. The future…
In preparation for peening an outdoor bronze sculpture, glass beads (the abrasive) are loaded into a metallic hopper. This vessel, after being filled with beads, operates by accepting compressed air (the propellant medium) through a single entrance pipe and dispensing (at a variable rate) the abrasive laden medium thr…
The method for measuring the stopping power of materials for charged particles using ion-induced x-ray emission is described in detail, and the results for 100-keV protons on yttrium and samarium are presented to exemplify the method. By utilizing a lithium-drifted silicon detector, the thickness and uniformity of the…
The variation of longitudinal magnetoresistance with angle and strength of an applied field is used to determine the anisotropy energy and its strain dependence in 80-20 and 90-10 Permalloy films. The results can usually be interpreted in terms of single-domain theory. Measurements for applied strains at angles other…
One of the textile industry’s largest consumers of energy is the tenter frame dryer. To assist the industry in operating these dryers efficiently, a mathematical model which simulates the drying process and a scheme to solve for the parameters in the differential equations of the model have been developed and are pres…
Abstract Changes in transparency and color as well as G HCl values of hard PVC foils exposed to gamma radiation were investigated while using different amounts of the stabilizers ethylene glycol bis‐β‐aminocrotonate (I), calcium/zinc laurate + epoxy compounds (II), and magnesium/zinc stearate + sorbitol + epoxy compou…
Abstract A technique for producing thin film samples WS 2 is reported. Exciton peak positions are measured as a function of hydrostatic pressure to 3500 atm at 90 K and temperatures in the range 90 to 300 K. Values for (∂ E /∂ P ) T for the A‐ and B‐peaks are 5.9 × 10 −6 and 7.2 × 10 −6 eV/atm, respectively. Peak C sh…
Abstract Die Lösewirkung von Systemen aus Säreanhydrid beziehungsweise Särechlorid des Schwefels oder Phosphors und polarer organischer Flüssigkeit beziehungsweise aus Säureanhydrid oder ‐chlorid, aliphatischem Amin und polarer organischer Flüssigkeit gegenüber Cellulose wurde verglichen. Es wurde festgestellt, daß si…