Materials Literature
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Condensation of dipyrromethane with 2-formyl-5-methylpyrrole yields, 1,19-dimethyl-1,19-dideoxybiladiene-ac dihydrobromide, which can be cyclised in the presence of nickel or cobalt ions to give the corresponding metal 1,19-dimethyltetradehydrocorrin salts. Hydrogenation of these salts under a wide variety of experime…
The diamagnetic, nonelectrolytic complexes M(CN)4(CNR)4(M = Mo or W; R = Me, Et, Prn, Pri, But, or CPh3) give unexpectedly simple i.r. and Raman spectra in the C–N stretching region. On the basis of X-ray data for Mo(CN)4(CNMe)4, all the complexes are presumed to have dodecahedral configurations.
In the previous paper,1 we have reported that 8-oxoheptafulvene (1) reacts with monocyclic tropones to from adducts (2) containing a novel norcaradiene and cycloheptatriene moieties according to apparent 8 + 2 cycloaddition process.
The quenching stress, which is due to thermal and transformation strains, was presented as afunction of change in lemjlerature distribution which was ilifluenced by quenching melhods and sizes of steels. i n Ihe slale rif sleels during quenching elastic fl arls were discriminated from plastic p aris on Ihe basis of th…
Abstract not Available.
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.
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 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…
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.…
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).
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…
Sulphur dioxide interacts reversibly with tetraphenylporphyrincobalt(II) to form an adduct in which SO2 functions as a donor, while oxygen forms a superoxide complex.
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…
The new compound, UOF4, has been prepared by the reaction of UF6 with H2O in a HF slurry.
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…
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
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…
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…
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…
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).