Periodic Phenomena During the Anodic Dissolution of Iron in Sodium Chloride Solutions
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Materials Literature
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The crystal structure of 5-benzoyloxyoctaethylporphyrin. An example of a distorted porphyrin ring
The X-ray structure determination of 5-benzoyloxyoctaethylporphyrin is reported; the porphyrin skeleton is significantly ruffled, with an alteration in geometry of the central ‘hole’, compared to that in porphyrin itself.
Electronic spectra of some post-transition-metal halide complexes
The electronic absorption spectra of tetrahalide complexes of ZnII, CdII, HgII, and TlIII have been measured either in solution or as thin films. The effects of second-order spin–orbit coupling account satisfactorily for the observed band intensities and splittings. The one-electron transitions responsible for the low…
The kinetics and mechanism of the spontaneous alcoholysis of p-chlorophenyl isocyanate in diethyl ether. The association of alcohols in diethyl ether
The self-association of four simple aliphatic alcohols in ether solution has been investigated. In the concentration range 0·1–1·2 mol dm–3 the principal polymer is in every case the dimer. At 25 °C the dimerisation constants K2(=[dimer]/[monomer]2) have the values 0·49, 0·71, 0·50, and 0·72 for MeOH, EtOH, PriOH, and…
The natural landscapes of Canada : a study in regional earth science
Modeling and Analysis of Mechanical Systems. Modeling of Electrical Systems. Elasticity, Damping, and Mechanical Transformers. Fluid and Thermal Systems. Frequency Response and Vibration. Introduction to Feedback Control Systems. Control System Design: Tuning, Compensation, and Digital Control. The Root Locus Method.…
Experimentelle Bestimmung der Gitterparameter der Platinmetalle im Temperaturbereich von -190 bis 1709°C
Article Experimentelle Bestimmung der Gitterparameter der Platinmetalle im Temperaturbereich von -190 bis 1709°C was published on January 1, 1972 in the journal International Journal of Materials Research (volume 63, issue 1).
Optical Materials Research
There are eras in research when days are filled with excitement because unique materials are being produced and researchers "think what nobody else has thought" (Albert von Szent Gyorgyi). Such were the periods when many new optical glasses emerged from the laboratories of the Eastman Kodak Company and when the hot pr…
An electron spin resonance study of the interaction of sulphur dioxide with tetraphenylporphyrincobalt(II)
Sulphur dioxide interacts reversibly with tetraphenylporphyrincobalt(II) to form an adduct in which SO2 functions as a donor, while oxygen forms a superoxide complex.
Oxidation State of Anodic Tantalum Oxide after Heat-Treatment
During heat‐treatment of anodic in vacuum (10 −5 Torr) at temperatures in the range from 200° to 700°C oxygen exchange between the anodic oxide, the Ta substrate, and the atmosphere was observed. Galvanostatic reanodization experiments resulted in potential‐time (charge) curves which could be used to determine the oxi…
Preparation of uranium oxide tetrafluoride
The new compound, UOF4, has been prepared by the reaction of UF6 with H2O in a HF slurry.
Grafting of cellulose and derivatives by means of diazonium salts
Abstract New amino aromatic esters and ethers of cellulose were synthetized. Then grafting processes were performed on these derivatives by using acrylic, methacrylic and N‐vinyl pyrolidone monomers. Finally, chemical structure and physicomechanical properties were determined. Industrial experiments proved the utility…
Localized Corrosion—Cause of Metal Fatigue
The Symposium on Localized Corrosion—Cause of Metal Fatigue was presented at the Seventy-fourth Annual Meeting of the American Society for Testing and Materials held in Atlantic City, N. J, 27 June-2 July 1971. The sponsor of this symposium was Comm
Oxygen Transport and Charge Storage in Calcium Orthovanadate
Electrolytic effects, crystal coloration, and charge storage observed when an electric field is applied to single crystals of calcium orthovanadate at temperatures above 700 °C are shown to be associated with oxygen migration and the creation of V 4+ centers in the crystal. The oxygen transport number is shown to be c…
Dielectric and Transport Properties of Insulating Films
By an insulating film we mean one which passes little or no electric current on the application of a voltage across it. If the film were a single crystal of pure material this would require it to have a bandgap of 2 eV or more, so that there would be few intrinsic carriers over a practical temperature range. In practi…
Generation and Propagation of Chloride-Pits on Rotating Stainless Steel Electrode in Acid Solution
Anodic pit generation and pit growth of stainless steel at constant potential in a sulphuric acid solution containing chloride ion have been investigated by use of a rotating electrode. The electrode rotation makes the generation and growth of pits very stable and enables the pit generation frequency and the pitting c…
Standard enthalpy of formation of crystalline gold(III) oxide
The heat capacity and the enthalpy of the quantitative thermal decomposition of crystalline Au2O3 have been measured by differential scanning calorimetry. A value of –13.0±2.4 kJ mol–1 is calculated for ΔfH⊖(Au2O3,s).
Calcium ion binding to uncharged sugars: crystal structures of calcium bromide complexes of lactose, galactose, and inositol
Interactions of calcium ions with uncharged sugars lead to complexes in which the calcium ions are surrounded by square-antiprism co-ordination shells composed of water molecules and sugar hydroxyl groups.
Stress Corrosion Cracking of a High Strength Steel
Stress corrosion crack growth rates (dA/dT) as a function of stress intensity factor (K) were determined over a wide range of electrode potentials for AISI 4340 steel (200-ksi yield strength level) in deaerated 3.5 percent sodium chloride solution buffered to pH 3.8. Particular emphasis was placed on conducting the st…
Dislocation Stresses in a Thin Film Due to the Periodic Distributions of Dislocations
The state of stresses and displacements in thin films due to the presence of a periodic distribution of screw dislocations and edge dislocations is investigated by the method of continuously distributed dislocations and the three-dimensional theory of elasticity. The dislocations are straight and pierce obliquely the…
Changes in porosity of treated lint cotton fibers. I. Purification and swelling treatments
Abstract Changes in the internal morphology of lint cotton fibers during purification and swelling treatments were investigated by measurement of nitrogen adsorption at liquid nitrogen temperature. Surface areas and pore size distributions were calculated from the adsorption isotherms and compared with findings from m…