The Organic Metallic State1
The development of the organic metallic state is traced from our original synthesis and study of TTF-TCNQ to the new conductor HMTSF-TCNQ, the first organic substance which remains metallic as T → 0.
Materials Literature
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On the Magnetic Anisotropy in Hexagonal Perrites
The temperature dependence of the anisotropy constants of some hexagonal ferrites is analyzed on the basis of the Callen and Callen model applied to the different sublattices whose magnetizations are taken from Mössbauer data. The analysis allows clarification of the role of the different mechanisms which cause the an…
Stress Development in Solutions of Polystyrene Blends
The development of shearing stress after onset of steady shear flow has been measured for concentrated solutions in chlorinated biphenyl of monodisperse polystyrenes (M=2.75×105 and 1.53×106) and their blends. The effect of molecular weight distribution on the transient behavior has been discussed on the basis of expe…
Studies on Thermal Decomposition Process of Lanthanum Hydroxide
As a part of the study on sintering reactions, the thermal decomposition process of La(OH)3 was investigated by using T.G.A., D.T.A. and X-ray diffraction method. From the results thus obtained, the detailed mechanism of the decomposition was inferred.(1) The thermo-gravimetric curves of specimens were obtained in air…
Synthetic and biosynthetic studies of porphyrins. Part 2. Synthesis of isopempto- and isochlorocruoro-porphyrins
Isopempto- and isochlorocruoro-porphyrin dimethyl esters have been prepared by application of the MacDonald porphyrin synthesis. The vinyl group was introduced by elimination of hydrogen chloride from chloroethyl side-chains carried through from an intermediate pyrrole, and the formyl group (of isochlorocruoroporphyri…
The New Special Names of SI Units in the Field of Ionizing Radiations
New SI units for ionizing radiations have been recommended by the internation Commission on Radiation Units and Measurements (ICRU). These are the becquerel (symbol Bq), equal to the second to the power -1, and the gray (symbol Gy), equal to the joule per kilogram. It was recommended that the roentgen be replaced as t…
Inhibition of the rates of nucleation and growth of hexanedioic acid crystals by related compounds
Hexanedioic acid (Adipic acid) precipitation from aqueous solution at 25 °C was followed thermometrically. The precipitation was preceded by a long induction period, where no precipitate was observed; more than half of the total possible precipitate formed during the following period of the same length. The rate of pr…
An Improved Method for Determining Magnetic Anisotropy Constants in Monocrystalline Alnico Alloys
An improved method is proposed of determining magnetic anisotropy constants for Alnico monocrystals subjected to the optimal field treatment. The magnetic torque curves are measured for the (001) disk specimen in various intensities of magnetic field, and then they are resolved by a harmonic analysis to obtain the Fou…
Interaction between aluminium dihydrogen phosphate and quartz
Abstract Thermal‐balance and differential‐scanning calorimetric studies of the aluminium dihydrogen phosphate/quartz system are reported. An interaction involving a chemical bond is demonstrated and characterised. A study of the nature of the species is reported and an unusual phosphate formula, Al(HP 2 O 7 )·2.5H 2 O…
Grundlagen der Theorie des Parakristalls und ihre Anwendungsmöglichkeiten bei der Untersuchung der Realstruktur kristalliner Stoffe
Abstract Es wird ein kurzer Überblick über die Grundvorstellungen der Theorie des Parakristalls und ihre Anwendung in der Röntgen‐Feinstrukturanalyse gegeben. Weiterhin werden die Beziehungen erörtert, die zwischen der Theorie des Parakristalls und den Flüssigkeitstheorien von O RNSTEIN , Z ERNIKE und Z ERNIKE , P RIN…
Kinetics of glass formation
The time needed to reach the glass transition temperature, at a constant cooling rate, with a small enough crystallized fraction (less than 10–4) is used as a criterion for glass-forming ability. In order to compute this cooling time, the rates of nucleation, growth and cooling have been coupled together in a kinetic…
Effect of titanium additions on the strain-aging characteristics and mechanical properties of carbon–manganese reinforcing steels
Strain aging in 0·2C–Mn steels is eliminated by the addition of 0·02−0·03% Ti which is approximately the stoichiometric addition for steels containing 0·005−0·006%N. This critical amount of titanium also increases the Lüders strain and decreases the impact transition temperature of these reinforcing steels. It is sugg…
Poly(amide‐acetals) and poly(ester‐acetals) from polyol acetals of methyl 9(10)‐formylstearate: Preparation and physical characterization
Abstract Condensation polymers were prepared from the pentaerythritol acetal of methyl 9(10)‐formylstearate by reaction with diamines and with ethylene glycol. The glycerol acetal was self‐condensed to a poly(ester‐acetal) and also copolymerized with caprolactam. A novel step growth, addition polymerization was carrie…
Pitting Corrosion of Titanium Tubes in Hot Concentrated Brine Solutions
Pitting problems have been encountered in titanium tubes in heat exchangers handling hot saturated brines. These pits appear to be of two types. One type results in symmetrical holes about one-fourth inch diameter. These are associated with scratches in which iron is found to have been smeared into the titanium surfac…
Catalytic reactions on metal surfaces: A review of the recent contributions of surface science
Recent work on the relationships between catalytic reactions on metallic single crystals and the physical properties of the surfaces is reviewed. Striking advances have been achieved in this area of surface science with regard to structure sensitivity, adlayer effects on activity and selectivity, the collision dynamic…
An Examination of the Cause of the Humidity Sensitivity of the Lightfastness of Dyed Materials
Light fading of some typical sulfonated acid wool and direct cotton dyes has been assessed, visually against the blue standards, on cotton, wool, silk, and anodized aluminum, and spectrophotometrically in films of regenerated cellulose and gelatin, at various respective relative humidities of the surrounding atmospher…
Current Research on Chemical Modification of Cellulose
Abstract
Biosynthesis of formycin. Incorporation and distribution of labeled compounds into formycin.
1. Two carbons, carbon-2 and one of carbons-3 to -5, of lysine seemed likely to be incorporated into one of carbon of the chromophore moiety of formycin. 2. From the results of radioisotopic studies with glutamate, gamma-amino-n-butyrate or organic acids related to tricarboxylic acid cycle, the important role of gluta…
Redetermination of the crystal structure of dipotassium imidobis(trioxosulphate) by neutron diffraction
The crystal structure of the title compound has been redetermined from three-dimensional neutron diffraction data with 511 reflections. Z= 4 in the monoclinic space group C2/c, with cell dimensions a= 1 248.3(6), b= 749.9(4), c= 720.8(3) pm, β= 91.21(2)°. The structure was refined by full-matrix least-squares in the c…
Work Hardening of Cu-10 at%Al Alloy Single Crystals with Multiple Glide Orientations
Copper-10 at% aluminum alloy single crystals with tensile axes in the [001], [112], [111], [212], [101], and [102] directions were extended in the temperature range between −195 and 800°C. Yield stresses resolved on the active slip systems were almost independent of crystal orientation below 400°C. Rotation of the ten…