Cell Wall and Coat of the Developing Akinete of a Cylindrospermum Species
The mature akinete coat of a Cylindrospermum species contains laminar layers, not present in immature akinetes, and a thickened intermediate layer.
Materials Literature
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The effect of microtacticity on the glass temperature of poly[α-methyl styrene]
The effect of micrestructure on the glass temperature Tg of poly (α-methyl styrene) has been investigated. It has been observed that Tg increases as the syndiotacticity of the molecule increases-thus Tg = 446 ± 2°K for polymer with 67% syndiotactic placements, while a value of Tg = 453 ± 2°K is found for a sample with…
Interpretation of the kinetics of thermogravimetric analysis
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpretation of the kinetics of thermogravimetric analysisEli S. Freeman and Benjamin CarrollCite this: J. Phys. Chem. 1969, 73, 3, 751–752Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org…
Metamagnetism in the perovskite compound Gd2CoMnO6
The compound Gd2CoMnO6 crystallizes with the orthorhombic perovskite structure and is isomorphous with GdFeO3. A crystal structure refinement shows that the Mn3+-O2−-Mn3+ bond angles are ∼ 145° and that the distortion from cubic symmetry is considerable. A spontaneous moment of 5 e.m.u./g develops below 115°K due to t…
The formation of stacking faults in {1012} twins in zinc as a result of slip dislocation-deformation twin interactions
An electron microscope investigation has been made of the decomposition of ⅓〈1120〉 slip dislocations when they penetrate {1012} deformation twin boundaries in polycrystalline zinc specimens. The results show that the decomposition can result in the formation of stacking faults in deformation twins and that these fault…
9—THE PROPERTIES OF AIR-TEXTURED CONTINUOUS FILAMENT YARNS
A processing programme is outlined in which yarn pre-twist, applied air-pressure, and supply-yarn overfeed are systematically varied in the air-jet bulking process to investigate their effects on air-textured nylon 6.6 continuous-filament yarns. Optical magnification of the air-textured yarns enables the average loop…
THE EFFECT OF HYSTERESIS OF PORE‐WATER ON THE HYDRAULIC CONDUCTIVITY
Summary It is pointed out with the help of the Independent Domain Theory, that a fraction of the pore‐water constituting a volume Δ V is contained in pores not common to both the wetting and drying states and that this volume in a wetting state is contained in pores whose draining radii are greater than those of the p…
Preparation of α-Manganese Single Crystals and Their Physical Properties
Single crystals of α-manganese were grown by the distillation method. These weigh about 300 mg. Crystallographic parameters which define the positions of manganese atoms have been determined by x-ray diffraction. The magnetic structure was determined with better accuracy than that determined by the powder method. It i…
The amount and location of amorphous component in polyethylene single crystals
Polyethylene single crystals from dilute solutions usually have a density ρ which is less than that of the ideal crystal lattice (ρc = 1.000 g/cm3). This density defect can be formally assigned to an “amorphous” component (1-α) = (ρc-ρ)/(ρc-ρa) and may be caused by vacancies in the crystal lattice and/or by the surfac…
Fischer‐tropsch waxes. II. Crystallinity and physical properties
Abstract The density, congealing point, and hardness were considered in relation to crystallinity, determined by an infra‐red spectrometric method, of a series of waxes which are fractions from crude Fischer–Tropsch wax. Values ranging between 65 and 93, expressed as molecular percentages of crystalline material prese…
An analog computer study of polymerization rates in vinyl chloride suspensions
Abstract An analog computer‐polymerizer system is described which polts continually the rate of polymerization in percent per hour and the total percent conversion. Computer components and their functions are briefly described and the polymerization vessel with its control instruments are shown. Methods of calibration…
Optimum conditions for generating channelling patterns in the scanning electron microscope
The optimum conditions are discussed for generating channelling patterns (i.e. orientation dependent lines and bands of contrast) in the scanning electron microscope. From considerations of the electron optics it is shown that patterns of highest angular resolution may be obtained by establishing a compromise between…
Effects of AlN on the Primary Recrystallization Textures in Cold-Rolled-(110)[001]-Oriented Single Crystals of 3% Silicon Iron
Cold-rolled-(110)[001]-oriented single crystals of 3% silicon iron containing AlN in solution develop a doublet {111} 〈110〉−oriented primary recrystallization texture consisting of grains with diameter of 0.5 to 1 mm after anneal at 550°C for 40 h followed by anneal at 1200°C. At the first anneal, very fine needle-lik…
Effect of the Anisotropic Exchange and the Crystalline Field on the Magnetic Susceptibility of Eu2O3
This paper invokes the combined action of the crystalline field and exchange in an attempt to explain theoretically why the susceptibility χ of cubic Eu2O3 is found by experimenters to be 30% higher than that for the free Eu3+ ion at temperatures below 50°K. The crystalline field is known approximately from optical st…
Pressure-Effect Measurements Using a Vibrating-Coil Magnetometer
A vibrating-coil magnetometer used in conjunction with a helium-gas pressure-generating system has proved to be a versatile new means of studying the effects of hydrostatic pressure on magnetic properties. The sensitivity of this system permits the measurement of paramagnetic susceptibilities on powder samples of the…
Interfacial Phenomena in Macromolecular Systems. II. Relaxation Modulus of Uncrosslinked Silica-Polydimethylsilosane Composites
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterfacial Phenomena in Macromolecular Systems. II. Relaxation Modulus of Uncrosslinked Silica-Polydimethylsilosane CompositesR. S. Chahal and L. E. St. PierreCite this: Macromolecules 1969, 2, 2, 193–197Publication Date (Print):March 1, 1969Publication History Published on…
X-ray studies on the thermal expansion of ruthenium dioxide
A precise X-ray determination of the lattice constants of ruthenium dioxide, RuO2, has been made in the temperature range 30° to 702°C using a Unicam 19 cm high-temperature powder camera. It has been observed that the c parameter decreases with increasing temperature as in the case of FeF2 and CrO2 which also have a r…
An Electromagnetic Probe for Detecting and Locating Discharges in Large Rotating-Machine Stators
The detection and location of discharges in rotating- machine high-voltage windings is useful in directing attention to abnormalities in the insulation structure which can lead to premature failure of the winding. In order to achieve a practically useful test it is necessary to distinguish between conditions involving…
The Corrosion and Oxidation of Metals: First Supplementary Volume
"The Corrosion and Oxidation of Metals: First Supplementary Volume." British Corrosion Journal, 4(2), p. 52
Anomalous Dispersion of Birefringence of Sapphire and Magnesium Fluoride in the Vacuum Ultraviolet
Previous measurements of the birefringence of sapphire and magnesium fluoride have been extended to their respective limits of transparency, revealing anomalous dispersion effects at short wavelengths, which are qualitatively discussed. Possible practical applications to Lyot filters and quarter-wave plates for Lyman-…