Materials Literature
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The effects of destabilizing vertical thermal gradients on crystal growth and segregation in an inverted Bridgman configuration were investigated in Ga‐doped Ge melts by monitoring the thermal characteristics of the melt and relating them through interface demarcation directly to growth and segregation. It was found,…
The spinel ferromagnetic semiconductor HgCr2Se4 (Tc=110 K) has been grown from the vapor. Annealing under Hg atmosphere gives n-type material. The Hg annealed HgCr2Se4 specimens are degenerated semiconductors with n=1017–1018 cm−3, μ4.2?300–1200 cm2/V sec. The resistivity increases by two orders of magnitude at Tc. Th…
The magnetic properties of crystallographically ordered ferromagnetic materials are strongly dependent on the presence of crystal defects, because of the effect of defects on the domain structure. Electron microscopy enables the defects and domain walls to be imaged simultaneously, and is therefore capable of giving d…
The temperature dependence of the saturation magnetization of vapor deposited amorphous Fe-Gd thin films have been analyzed in terms of the mean field theory. This analysis yielded values of the Fe spin, and the Fe-Fe and Fe-Gd exchange interaction energies, which were then correlated to composition. The temperature a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared study of methanol decomposition on alkali metal X-type zeolitesMark L. UnlandCite this: J. Phys. Chem. 1978, 82, 5, 580–583Publication Date (Print):March 1, 1978Publication History Published online1 May 2002Published inissue 1 March 1978https://pubs.acs.org/doi/10.1…
White rust corrosion of zinc and galvanized products remains a serious commercial problem, in spite ot almost 50 years of development of inorganic passivation techniques. Furthermore, such inhibitors compound the already difficult task of paint application to these materials. In a novel approach, the concept of surfac…
Investigation of aldolase 1, the class-I D-fructose 1,6-bisphosphate aldolase (EC4.1.2.13) from Escherichia coli (Crookes' strain), showed it to have unusual kinetic and structural properties. The enzyme appeared to be larger than was previously supposed and may be a decamer with a mol. wt. of approx. 340000. Its fruc…
Comparison of the energy of formation per defect, as deduced from experimental results on α‐Al 2 O 3 doped with donors and acceptors on the basis of various models, with theoretical values calculated by Dienes et al . for various disorder models shows closest correspondence of the exFrimentd values with the smallest t…
Abstract A new adhesion model for the bonding of sulfur-vulcanizable rubber compounds to brass has been presented and discussed. The adhesion is explained on the basis of an autocatalytic effect of a thin film of cuprous sulfide formed on the brass surface by the combined action of sulfur and vulcanization accelerator…
A general energy analysis has been formulated and applied to the study of fabric mechanics with the aid of computer programs. The analysis is chiefly concerned with the elastic or recoverable mechanisms of fabric rheology. The com puter programs can be readily adapted to provide a solution for various fabric structure…
Resins having different rubber particle sizes were prepared by polymerizing impact polystyrene using different agitation rates but keeping all other parameters constant. Also, samples were made varying the amount and type of rubber and type of agitation. The impact and tensile properties of the prepared resins are stu…
Abstract Die Epoxy‐Ketose 9 reagiert mit 2‐Lithio‐2‐methyl‐1,3‐dithian zum Addukt 13 und dem durch Epoxid‐Umlagerung aus 10 gebildeten verzweigten Zucker 11 . Das nicht umgelagerte Produkt 10 kann nicht abgefangen werden. Röntgenstrukturanalysen von 13 und 11 sichern deren Struktur und demonstrieren die Halbsesselform…
Generalized relations between the strength distribution function and derivatives of the fracture probability are developed for five widely used testing methods for measuring the strengths of ceramic materials. The derived relations for three of these methods are used to analyze room‐temperature fracture strength data…
A systematic investigation was made of magnetostriction and magnetization in amorphous thin films (∼1 micron) of TbxFe1−x with x=0 to 0.5 prepared by electron-beam co-evaporation. The amorphous or crystalline character of the films was determined using x-ray and Mössbauer techniques. Net magnetization, coercivity, and…
An in vivo method is described for screening polymeric materials for biocompatibility. The test is based on grading acute and subacute tissue reactions at 7 and 28 days, respectively, following implantation in rats. The methods is reproducible and reliable. It is designed to provide uniform test criteria for biocompat…
Adsorption isotherms of N2 on graphite have been studied in great detail in a coverage range corresponding to the transition between the fluid and the registered monolayer. This transition is first order up to a temperature of about 82 K. An adsorption isotherm at 84.69 K shows that the methane monolayer also changes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-photon spectroscopy of the visual chromophores. Evidence for a lowest excited 1Ag--like .pi..pi.* state in all-trans-retinol (vitamin A)Robert R. Birge, James A. Bennett, Brian M. Pierce, and Terry M. ThomasCite this: J. Am. Chem. Soc. 1978, 100, 5, 1533–1539Publication…
The EHS sarcoma (named after its discoverer, Engelbreth‐Holm, and its primary characterizer, R. Swarm) contains an extracellular matrix of basement membrane. The collagenous component of the membrane was extracted with dilute acetic acid from tumors grown in lathyritic mice and separated from other proteins by chromat…
A theory is presented which explains the spin-flip transition in chromium in terms of coupling to the spontaneous strain. The spin density wave is treated in a Landau formulation and both spin-independent electron-strain coupling and magnetostriction couple the strain to the spin density wave. This coupling explains t…
Slow strain rate tensile tests of forging brass in standard mercurous nitrate solution have been used to find the minimum stress necessary to propagate a crack. Comparison with constant load tests in HgNO3 and also in Mattsson's (NH4)2SO4-CuSO4 solution have verified that the threshold stress can be found rapidly by a…