Materials Literature
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The doublet at 850 and 830 cm-1 in the Raman spectra of proteins containing tyrosyl residues has been examined as to its origin and the relation of its components to the environment of the phenyl ring, the state of the phenolic hydroxyl group, and the conformation of the amino acid backbone. Raman spectral studies on…
Article Determination of the crystal symmetry of the polymorphs of thallium indium disulfide, TlInS2 was published on November 1, 1975 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 141, issue 1-6).
Abstract The DTA patterns of synthesized coprecipitated gels, the SiO2–Al2O3–Sc2O3–H2O system, resembled that of allophane as well as those of coprecipitated gels, the SiO2–Al2O3–M2O3–H2O system (M: Fe, Ga, or In). The exothermic reaction around 980 °C in the DTA was confirmed to arise from the formation of mullite. T…
According to earlier measurements with the two-aperture method, the brightness of electron guns has sometimes a maximum value near the cut-off potential. This result has been confirmed by means of the lens method. Experiments with well-oriented monocrystalline spherical cathodes lead to the result that a brightness ma…
The effects of the background vacuum level and of atomic migration on the stability of pulsed-field emission have been investigated. Initial studies concerned the emission characteristics that depend on the emitter temperature. Then the effects of the bias field and the change of the emitter shape were considered, in…
Microminiaturization for the production of modern large-scale integrated circuits requires electron-optical devices capable of recording more than 10 000 resolved lines per frame at a resolution of 0.1 μm. Magnetic demagnifying electron-projection systems with compensated chromatic field aberrations are capable of rec…
Abstract The accelerated aging of a vulcanizate of fluorosilicone rubber was studied by four methods: infrared spectroscopy, GPC, weight loss, and stress relaxation, with the object of gathering information pertinent to understanding the basic mechanism of its aging. No changes were observed in infrared spectra of the…
Specific rates have been measured for hydrogen–water deuterium isotope exchange over unsupported nickel promoted with about 20% of various metal oxides. The oxides used were Cr 2 O 3 , MoO 2 , MnO, WO 2 −WO 3 , and UO 2 . Nickel surface areas, which are required to measure the specific rates, were determined by hydrog…
Abstract The effects of diffusion in the oxidation of cis ‐1,4‐polyisoprene vulcanizates were investigated by means of the stress relaxation method. It was assumed that the diffusion of oxygen is coupled with first‐order oxygen consumption and that the rate of chain scission is proportional to the rate of oxygen consu…
Abstract Die Kristallstruktur von MgTe 2 O 5 , orthorhombisch, Raumgruppe Pbcn–D , enthält Te 2 O 5 ‐Gruppen, in denen Te(IV) von drei Sauerstoffatomen in pyramidaler Anordnung koordiniert und ein Sauerstoffatom beiden Telluratomen gemeinsam ist. Durch längere TeO‐Bindungen sind diese Te 2 O 5 ‐Gruppen kettenartig ve…
The effect of aluminium addition on the magnetic moments of the constituent atoms of binary BCC Fe-Co, Fe-Cr and FCC Ni-Fe alloys was investigated by comparing the results of Mossbauer and average magnetization measurements. It was found that the Al neighbours do not perturb the moment of Fe atoms in the Fe-Co and Ni-…
Abstract When V2O5 is reduced isothermally by SO2 gas (200 cc/min), the weight loss shows the stepwise curve. Each step corresponds to the intermediate phase expressed by general formula VNO2N+1 (N=3,4,5, … and ∞). The quenched specimens at each step analyzed by an X-ray diffraction, however, have revealed to be coexi…
For some time a needle-to-sphere impulse breakdown test (ASTM D-3300) has been used for characterization of insulating oils used in high voltage equipment. Several observations can be made based upon a long background of use with this test.
Values of heats of combustion and oxygen indexes cited in the literature were used to develop the following equations: Oxygen Index = 0.0126 (mean heat energy of limiting heat flux, kcal/mole) - 0.036, and Oxygen Index = 0.01286 (mean heat energy of limiting heat flux, kcal/mole) - 0.044. The first equation applies bo…
High energy backscattered electron signals have been measured from 1-, 3-, and 10-μm-wide gold alignment marks on silicon and gallium arsenide substrates as a function of electron-beam energy (5–30 keV) and gold film thicknesses (650–10 000 Å) using an annular silicon-diode detector. Thin films of both silicon dioxide…
A simple method for measuring refractive index in the infrared is described. It uses autocollimation from the front surface of a prism and requires only that the receiver be moved to measure a new deviated ray when either the wavelength of the source or the temperature of the sample is changed. An error analysis that…
Using the adiabatic potential in the bond charge model, the phonon dispersion relation and the Grüneisen constant are calculated for Si with the magnitude of the bond charge and its volume change taken as adjustable parameters. It is shown that the Grüneisen constant for the transverse acoustic mode is positive at sma…
It has been shown experimentally that the combined effects of electrical and thermal aging can be evaluated properly only with simultaneous application of both kinds of stresses. A logical simultaneous aging test can be based on the conventional voltage and thermal endurance curves. This method can be expanded to othe…
The ASTM standard published through Committee G-1.11 was followed to obtain potentiodynamic anodic polarization curves for Type 410 stainless steel in hydrogen saturated 0.1N H2SO4 at 30 C. The published explanations for the second anodic maximum were cited. Evidence was provided by laboratory data which suggests that…
Abstract Photodegradation of polyurethanes based on polyester diol‐diphenylmethane‐p,′p‐diisocyanate in the absence and presence of various metal acetylacetonates (Ti, V, Cr, Mn, Co(II), Co(III), Fe, Ni, Cu, Zn, Mg, Al, and Sn) was carried out; and the effect of these metal compounds on the degradation was examined by…