Surface tension and capillary rise
The author criticizes the shortcomings of the usual text book explanations of surface tension and capillary rise which are two quite different types of phenomena.
Materials Literature
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Study of the pyrolysis of saturated chlorinated polyethylene fibers
Abstract The thermal degradation of saturated chlorinated polyethylene in powder and fiber form has been studied. Direct observations of fiber length variations have enabled us to prove the reactional mechanisms proposed. In the temperature range of 200°–300°C, the material exhibits some fluidity. Its degradation is e…
Tensile yield energy in glassy polymers
Abstract An activation energy theory of yielding in glassy polymers has been proposed by Starita and Keaton. It predicts a linear relation between energy to yield and test temperature. This concept was tested and found valid for five amorphous polymers; poly(methyl methacrylate), polycarbonate, polyarylsulfone, polysu…
Stacking fault propagation from a coherent twin boundary
Stacking faults nucleated at an annealing twin boundary in pure nickel are analysed by electron microscopy. The formation of the stacking faults is qualitatively explained in terms of the forces acting on the partial dislocations in the annealing twin boundary and in the matrix. The critical factors are found to be th…
3α‐ und 3β‐Amino‐3‐desoxy‐digitoxigenin. Partialsynthetische Versuche in der Reihe der Herzgifte, 5. Mitt.
Abstract Zusammenfassung . Es wird die Synthese der im Titel genannten 3‐Amino‐cardenolide beschrieben.
Growth of Ice IV and Equilibrium Curves between Liquid Water, Ice IV, Ice V and Ice VI
The phase diagram of water at moderate pressures is studied by a dielectric measurement for solid-solid transitions and further by a volume change method for liquid-ice VI transition. The metastable phase ice IV can be made from ice VI on decreasing the pressure at temperatures from -13.6 to -14.6°C. The growth and th…
Localisation of 4d1 Electrons near Protons in MoO3, Single Crystals (ESR Measurements)
Abstract It is shown by ESR‐measurements on differently treated single crystals of MoO 3 that in these crystals the localisation of molybdenum 4d 1 electrons is always connected with the presence of protons. We determine the parameters of the transferred hyperfine interaction tensor.
Oxidized polyethylenimine
Abstract Polyethylenimine (PEI) has been oxidized with aqueous hydrogen peroxide to yield a hygroscopic, water‐soluble, slightly basic, yellow polymeric solid (OPEI) containing about 25% oxygen. Some chain degradation accompanies oxidation. The nature of the product varies somewhat with preparative conditions. OPEI, i…
Magnetic Anisotropy of Cr1-xTe with x=0.077
The temperature dependence of the direction of the easy axis of magnetization in the ferromagnetic compound Cr 1- x Te ( x =0.077, T c =342 K) is determined by single crystal magnetic and neutron diffraction measurements in the temperature range from 80 K to 350 K. Below about 200 K the spin direction lies in the c -p…
Polarized Elastic Materials with Electronic Spin-A Relativistic Approach
In this article, we derive the balance laws and constitutive equations of polarized elastic solids with electronic spin by use of a relativistic (special) variational principle. The theory is fully dynamical and nonlinear. It is shown that this approach encompasses several previous works in micromagnetism (magnetoelas…
Conformation of Lysozyme in Aqueous Solution
The ionic strength, concentration, and temperature effects on the association‐dissociation properties of lysozyme in aqueous solution have been studied by gel chromatography. The following results were obtained: Increasing ionic strength leads to an increase in inter‐conversion rate between the monomeric and associate…
Growth of nearly stoichiometric MgAl2O4 spinel single crystals by a gradient furnace technique
Nearly stoichiometric MgAl2O4 spinel single crystals can be grown by a gradient furnace technique in molybdenum crucibles with an inert-gas atmosphere of industrial-grade argon, high-purity argon, or technical-grade helium. There is a reaction between MgO in the melt and the molybdenum crucibles which results in bands…
Relativistic Continua with Directors
In this article, we give an axiomatic introduction of directors in the space-time continuum of Minkowski. A variational principle is presented that leads to the complete set of field equations, boundary conditions, and jump relations of the Kafadar-Eringen theory of relativistic polar media. The constitutive equations…
Photosensitivity of polyvinylesters of substituted cinnamylideneacetic acids
Abstract Several polyvinylesters of substituted cinnamylideneacetic acids were synthesized and their photosensitivities were investigated. It was found that polyvinylesters of planar acids reacted photochemically effectively and were spectrally sensitized by usual triplet sensitizer. On the other hand, polyvinylesters…
The structure of the synthetic zeolite(K,Ba)-G,L
The crystal structure of the synthetic zeolite (K,Ba)- G , L , of unit cell composition K 2.7 Ba 7.65 [A1 18 Si 18 O 72 ] · 23H 2 O, has been determined at room temperature from accurate powder data. The zeolite is hexagonal with a = 18.70° and c = 7.50°. The structure was refined to an R ( I ) value of 0.13 assuming…
Collision integrals of oxygen atoms in different electronic states
Collision integrals (transport cross section) for atomic oxygen in the ground state ( 3 P) and in the first two excited states ( 1 D, 1 S) have been calculated, using potential energy curves as determined by ab initio quantum mechanical computations. The calculations include the collision integrals for diffusion, visc…
X-Ray and Neutron Diffraction Studies in Spinel Fe2MoO4
Stoichiometric sample of Fe 2 MoO 4 was prepared in a controlled atmosphere of CO 2 -H 2 mixed gas at 1140°C (log P o 2 - P o 2 ∼-12.5). The crystal structure and the cation distribution were determined from, X-ray and neutron diffraction measurements on the powdered samples. Fe 2 MoO 4 is a completely inverse spinel;…
Side‐chain crystallinity. V. Heats of fusion and melting temperatures on monomers whose homopolymers have long side chains
Abstract Heats of fusion and melting temperatures were obtained for selected monomeric n ‐alkyl acrylates, N‐n ‐alkylacrylamides, and vinyl esters. The corresponding thermodynamic parameters for homopolymers, derived from these monomers, had been reported previously from this laboratory. The α‐hexagonal crystal modifi…
Depth dose determinations I. Tissue-equivalent liquids for Standard Man and muscle
Requirements for tissue-equivalent mixtures are discussed, and methods are described for formulating mixtures exact in elemental composition and density. Methods are also given for estimating the densities and vapour pressures of mixtures of known compounds, as well as a list of the properties of compounds useful in t…
Anisotropy parameters and coercivity for sintered Co5Sm permanent magnet alloys
Saturation magnetization, intrinsic coercive force, anisotropy field, and anisotropy constants were determined for a sample of sintered Co5Sm at 4.2, 77, 300, and 500 °K. The ralationship between the temperature dependence of the coercivity and the anisotropy parameters is discussed.