Hormigón frío
No disponible
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
On the relations between structure and morphology of crystals. II
The characteristic features of S-faces (stepped faces, i.e. faces parallel to one periodic bond chain only) are further developed. After giving some definitions, a discussion follows of the factors determining the morphological importance of S-faces. The conclusion is drawn that the development of S-faces in a particu…
Continuous distributions of dislocations: a new application of the methods of non-Riemannian geometry
Abstract When describing a crystal containing an arbitrary distribution of dislocation lines it is often convenient to treat the distribution as continuous, and to specify the state of dislocation as a function of position. Formally, however, there is then no ‘good crystal’ anywhere, and difficulties arise in defining…
Acyl Derivatives of Glyceraldehyde-3-Phosphate Dehydrogenase
Acetyl phosphate and 1,3-diphosphoglycerate react with glyceraldehyde-3-phosphate dehydrogenase to form relatively stable enzyme substrate compounds. These compounds appear to be thiol esters, and their properties indicate that they are intermediates in the catalytic activity of the enzyme: they undergo hydrolysis and…
Thermal Conductivity of Germanium at Ambient Temperatures
The thermal conductivity of high-purity germanium has been measured; it varies approximately linearly from 0.61 watt ${(\mathrm{c}\mathrm{m}\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{\ifmmode^\circ\else\textdegree\fi{}})}^{\ensuremath{-}1}$ at 5\ifmmode^\circ\else\textdegree\fi{}C to 0.50 watt ${(\mathrm{c}\mathrm{m}\…
Gyromagnetic Ratio of Iron at Low Magnetic Intensities
It is shown that the measured value for the gyromagnetic ratio of pure iron as determined by a direct magneto-mechanical method, undergoes a change for low values of the induced magnetic intensity. The effective value of this ratio extrapolated to zero intensity, checks the value which is theoretically expected from a…
Ferromagnetic Resonance in Two Nickel-Iron Ferrites
Ferromagnetic resonance data are presented as a function of temperature from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 380\ifmmode^\circ\else\textdegree\fi{}K in (Ni${\mathrm{O})}_{0.95}$(Fe${\mathrm{O})}_{0.05}$${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$ and in (Ni${\mathrm{O})}_{0.75}$(Fe${\mathrm{O})}_{0.25}$${\mathrm{F…
Magnetostriction and Permeability of Magnetite and Cobalt-Substituted Magnetite
The principal magnetostriction constants of magnetite were determined over the temperature range from 120\ifmmode^\circ\else\textdegree\fi{}K to 300\ifmmode^\circ\else\textdegree\fi{}K by the strain gauge technique. Since ${\ensuremath{\lambda}}_{111}$ and ${\ensuremath{\lambda}}_{100}$ are different in sign and pract…
Classical Calculation of Differential Cross Section for Scattering from a Coulomb Potential with Exponential Screening
The potential energy function considered is $V=(\frac{{Z}_{1}{Z}_{2}{e}^{2}}{r})\mathrm{exp}(\ensuremath{-}\frac{r}{a})$, which approximately represents the potential between two atoms in collision taking into account the screening of the atomic electrons. Here the first factor is the Coulomb potential and the exponen…
Paramagnetic Resonance Absorption in Glass
Paramagnetic resonance absorptions occurring with spectroscopic splitting factors of 4 and 6 were noted in all glass samples studied. These were apparently anisotropic $g$-values for a specific impurity and the peaks recorded are interpreted as being the result of a distribution of Stark fields over all directions in…
Electrical Behavior of Barium Titanatge Single Crystals at Low Temperatures
Barium titanate single crystals have electrical characteristics in the orthorhombic and rhombohedral phases which are similar to those observed in the tetragonal region. At a phase transition the coercivity, determined from 60 cps hysteresis loops, decreases sharply from its value at temperatures above the transition.…
Relations between the phases of structure factors
Relations between the phase angles of complex structure factors (analogous to the sign relations which are known to apply for real structure factors) are derived, and their possible application to crystal-structure analysis is discussed.
Catalysts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalystsBenjamin H. DanzigerCite this: Ind. Eng. Chem. 1955, 47, 8, 1495–1500Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://doi.org/10.1021/ie50548a019RIGHTS & PERMISSIONSArticle Views115Altmetric-…
Plasticizers for Poly(Vinyl Chloride) Resins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasticizers for Poly(Vinyl Chloride) ResinsCharles J. Knuth and Paul F. BruinsCite this: Ind. Eng. Chem. 1955, 47, 8, 1572–1578Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://pubs.acs.org/doi/10.102…
Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading
The tensile behavior of a Hookean material elongated by rapid impact at one end has been calculated, using a theory in which wave propagation is considered. As a result of these calculations, limits have been established on the applicability of a simpler theory, discussed in a preceding publication, in which wave prop…
The Pertechnetate Ion as an Inhibitor Of the Corrosion of Iron and Steel
Theoretical consideration of possible mechanisms to account for the action of inorganic corrosion inhibitors of the XO4n- type led to the discovery that the pertechnetate ion, TcO4-, inhibits the corrosion of iron and carbon steels in aerated water at temperatures from 23 to 250 C, which was the highest temperature in…
Stress Corrosion Cracking Of Hardenable Stainless Steels
Hardenable stainless steels, like other high-strength steels, are susceptible to cracking under the combined influence of tensile stress and corrosion, depending on the severity of the stress, the nature of the media and to a large extent, on their hardness. The most severe conditions are acid solutions containing sul…
Tracer Diffusion of Iron in Stainless Steel
The tracer diffusion of iron in 18−8 stainless steel has been measured over a wide temperature range by the surface activity decrease method, using radioactive Fe55. The results show that the lattice diffusion coefficients can be described by the equation D=0.58 exp(−67 100/RT) cm2 sec−1. The effect of variations in g…
Domain Configurations and Crystallographic Orientation in Grain-Oriented Silicon Steel
The magnetic domain structure of polycrystalline grain-oriented 3¼% silicon steel has been investigated by the magnetic-powder-pattern technique and the orientation of individual grains determined by the etchpit optical-goniometer technique. A semiquantitative relationship has been found between the domain patterns an…
The spherulitic structure of crystalline polymers. Part III. Geometrical factors in spherulitic growth and the fine‐structure
Abstract The spherulites are built of distinct fibrillar units and their fine‐structure presents two problems: the arrangement of these units and their internal structure. In the present paper the first has been treated in greater detail. Based on direct observations, and on earlier works on nonpolymeric spherulites,…