Energy transfer processes
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A Study of Damping Capacity in Magnesium Alloys
The effects of additions of nickel to magnesium over the composition range from 0 to 40.41% and of copper, aluminium, and tin to magnesium by 15.10%, 18.40%, and 21.40%, respectively, on the internal friction and Young’s modulus have been investigated by use of the flexural vibration method at room temperature. It was…
Mechanochemical studies of enzymatic degradation of insoluble collagen fibers
A mechanochemical method was developed for studying the enzymatic degradation of insoluble collagen fibers. The method involves stretching the collagen fiber to a fixed extension in the presence of a solution of collagenase and measuring the rate of relaxation of the force induced in the fiber. In this work, bacterial…
Pyrromethene‐BF2 complexes (4,4′‐difluoro‐4‐bora‐3a,4a‐diaza‐s‐indacenes). Synthesis and luminescence properties
Abstract BF 2 complexes of alkylated pyrromethenes were prepared by reacting the corresponding pyrromethenes with BF 3 ·OEt 2 under basic conditions. A striking aspect of these complexes is a pronounced fluorescence in organic solvents, even at room temperature, with fluorescence quantum yields between 0.3‐0.8. The ef…
Effect of Fluid Dynamics on the Corrosion of Copper-Base Alloys in Sea Water
A technique for testing materials in sea water under velocity conditions has been developed which utilizes fluid dynamics to evaluate the corrosion test results. The data obtained from this technique may then be applied to other hydrodynamic systems where the fluid dynamics equations are known. This allows high veloci…
Clothing comfort: interaction of thermal, ventilation, construction and assessment factors
A comprehensive review is presented of the present state of our knowledge in the science of clothing comfort. Information is given on thermal comfort factors and concepts, physiological aspects, use of acoustic testing to predict clothing comfort properties, comfort finishing (synthetic fabrics), cotton and cotton ble…
An energy-conserving pyruvate-to-acetate pathway in Entamoeba histolytica. Pyruvate synthase and a new acetate thiokinase.
Under anaerobic conditions, cells of Entamoeba histolytica grown with bacteria produce H2 and acetate while cells grown axenically produce neither. Aerobically, acetate is produced and O2 is consumed by amebae from either type of cells. Centrifuged extracts, 2.4 x 106 x g x min, from both types of cells contain pyruva…
Bundle‐like nucleation and longitudinal growth of fibrillar polymer crystals from flowing solutions
Abstract This paper gives a brief account of the areas in which fibrillar crystals have been encountered and provides a mechanism for the formation of bundle‐like nuclei and the longitudinal growth of fibrillar polymer crystals from flowing solutions.
Dynamic failure in solids
All material failure is dynamic, almost by definition. It advances by rate processes that have threshold conditions and characteristic growth kinetics.
Thermophysical Properties of Matter - the TPRC Data Series. Volume 13. Thermal Expansion - Nonmetallic Solids
Abstract : The TPRC Data Series published in 13 volumes plus a Master Index volume constitutes a permanent and valuable contribution to science and technology. This 17,000 page Data Series should form a necessary acquisition to all scientific and technological libraries and laboratories. These volumes contain an enorm…
The parabolic focal conic : a new smectic a defect
The special case of a focal conic defect in which the line discontinuities form a pair of confocal parabolae (a parabolic focal conic) has been observed in smectic A cyanobenzylidene octyloxyaniline. The geometry of these defects has been studied and used to determine their interactions with bounding surfaces and with…
Comparison of alternative formulations of 3-dimensional magnetic-field and eddy-current problems at power frequencies
The numerical calculation of 3-dimensional eddy currents is complicated by the need to use vector functions to describe the interlinked flux and current distributions. The three vector components are coupled, particularly by the conditions imposed by the copper and iron surfaces, and by other changes in material prope…
On the microscopic interpretation of flexoelectricity
Recognition of the importance of electric quadrupoles allows a new interpretation of the flexoelectric phenomenon to be proposed. Meyer's model and the influence of charge are also discussed.
On the stacking-fault energies of copper alloys
The stacking-fault energies of a number of copper alloys with electron-atom ratios less than or equal to 1·10 have been measured from observations of single dissociated dislocations imaged using the weak-beam method of electron microscopy. The results are compared with previous determinations made using the extrapolat…
A new class of highly conductive molecular solids: the partially oxidized phthalocyanines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new class of highly conductive molecular solids: the partially oxidized phthalocyaninesJ. L. Petersen, C. S. Schramm, D. R. Stojakovic, B. M. Hoffman, and T. J. MarksCite this: J. Am. Chem. Soc. 1977, 99, 1, 286–288Publication Date (Print):January 1, 1977Publication Histor…
Catalytic Properties of Rare Earth Oxides
The rare earth (lanthanide) oxides, although constituting a closely related group of compounds, exhibit a rich variety of characteristic behaviors and solid-state properties, including several features that make them interesting subjects for Catalytic studies. Abundances and costs of these materials parallel those of…
Interaction Between Collagen Type I and Type III in Conditioning Bundles Organization
Type I and type III collagen extracted from skin was purified by differential salt precipitation and chromatography. By heating to 37 degrees, type I formed after a lag phase a floppy and opalescent gel of high optical density and type III formed more rapidly a translucent and rigid gel of low optical density. Additio…
Neutron radiation damage in NbO single crystals
The effect of neutron irradiation and subsequent recovery has been studied for NbO single crystals of a defective NaCl structure containing 25% vacancies of niobium and oxygen. A very large increase (about 1%) in the lattice constant is observed after irradiation of 1.5 × 1019 and 1 × 1020 nvt (> 1 MeV). From the inte…
Dissolution and passivation of nickel. An X-ray photoelectron spectroscopic study
The presence and nature of surface species formed on a nickel electrode after polarisation in 0.5 mol dm–3 sulphuric acid and 0.5 mol dm–3 sulphuric acid + 0.005 mol dm–3 nickel sulphate has been investigated by X-ray photoelectron spectroscopy. The film produced in the active, prepassive, passive and transpassive reg…
Clinoptilolite: the distribution of potassium atoms and its role in thermal stability
Article Clinoptilolite: the distribution of potassium atoms and its role in thermal stability was published on December 1, 1977 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 145, issue 1-6).