Consideraciones prácticas en el bombeo de pastas crudas para fabricación de cemento
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The infrared spectra of crystalline polysaccharides. VIII. Xylans
Abstract Oriented films of 4‐ O ‐methylglucuronoxylan from several sources were prepared by hot stretching acetyl derivatives. The resulting oriented samples could be converted to crystalline xylans without destroying the orientation. Infrared spectra of the oriented samples were recorded using polarized radiation. Ba…
Crack-Tip, Stress-Intensity Factors for Plane Extension and Plate Bending Problems
A complex variable method for evaluating the strength of stress singularities at crack tips in plane problems and plate bending problems is derived. The results of these evaluations give Irwin’s stress-intensity factors for plane problems and analogous quantities for bending problems, a form familiar to the practition…
Far Infrared Dielectric Dispersion in BaTiO3, SrTiO3, and TiO2
The room temperature reflectivity of BaTi${\mathrm{O}}_{3}$, SrTi${\mathrm{O}}_{3}$, and Ti${\mathrm{O}}_{2}$ has been measured from 5000 to 70 ${\mathrm{cm}}^{\ensuremath{-}1}$. These data have been analyzed by the Kramers-Kronig method and by classical dispersion theory. All of the infrared-active fundamental vibrat…
Mössbauer Spectra of Some Iron Complexes
Mössbauer spectra were obtained for the following coordination compounds: iron phthalocyanine, ferrocene, iron carbonyl, iron III acetylacetonate, and iron II acetylacetonate dipyridine; for the following complex ion salts iron II trisphenanthroline chloride, iron III EDTA (monosodium salt), iron II EDTA, hemin, ferri…
Extrapolation of the Orthorhombic n-Paraffin Melting Properties to Very Long Chain Lengths
An analysis of the equation TM=T0 (n+a) / (n+b) is made in order to determine the convergence temperature T0 of the melting temperatures of the n-paraffins from C44 to C100. A good fit is obtained using T0=414.3°K, a=—1.5, and b=5.0. This value of T0 (414.3°K=141.1°C) has an estimated total uncertainty of ±2.4°K and i…
Diffraction contrast of electron microscope images of crystal lattice defects. III. Results and experimental confirmation of the dynamical theory of dislocation image contrast
Abstract Numerical solutions for the transmitted and diffracted wave intensities when electrons pass through a thin foil containing a dislocation, are obtained by the use of a previously derived formulation of dynamical diffraction theory which takes account of anomalous absorption effects. The results for a variety o…
Studies of the Movement of Wool Fibers in Fabrics During Felting
Two types of fabric, a tightly constructed worsted and a woolen of more open con struction, have been milled in laboratory stocks. Curves of (i) shrinkage in both warp and weft directions, as a function of time, and (ii) the mean displacement d of those fiber portions which have moved, also as a function of time, have…
THE SULPHURIC ACID SOLVENT SYSTEM: PART III. THE PREPARATION AND STRUCTURES OF SOME COMPLEX SULPHATOBORATES
By neutralizing sulphuric acid solutions of tetra(hydrogensulphato)boric acid with various metal hydrogensulphates, sodium, potassium, ammonium, and strontium salts have been prepared. From the compositions of these salts, and from the results of cryoscopic and conductimetric measurements on their solutions in sulphur…
Cyanoethyl and aminopropyl ethers of polyvinyl alcohol
Abstract The presence of free hydroxyls in polyvinyl alcohol presents a multitude of opportunities for changing the properties of this polymer, a fact which is of considerable theoretical and practical interest. The results are presented of a study of the incorporation of nitrile and amino groups in polyvinyl alcohol.…
Sorption of Anhydrous Ammonia by Dry Clay Systems
Abstract NH 3 sorption and/or retention over the pressure range of 0 to 100 ml. of mercury by dry bentonite, halloysite, and synthetic gibbsite was investigated using a manometric technique employing equilibrium measurements in a special sorption apparatus. Chemisorbed NH 3 is believed to be that which has gained a pr…
Specific Binding of Rubidium in Chlorella
Specific binding sites for potassium, which may be components of the carriers for active transport for K in Chlorella, were characterized by their capacity to bind rubidium. A dense suspension was allowed to take up Rb(86) from a low concentration of Rb(86) and a high concentration of ions which saturate non-specific…
Thermal stability of polydimethylsiloxane. II. Formation of stable complexes on basic active centers
Abstract Amphoteric hydroxides are found to possess a great ability to deactivate the “living” ends of polydimethylsiloxane molecules. They not only prevent depolymerization but also suppress the formation of crosslinks between polymer molecules (which is due to the oxidation of methyl groups). Deactivation of active…
Note on colloidal dispersions from block copolymers
Clay Clay minerals Kendposi and Bhonda Mixtures of poorly crystallized kaolinite, montmorillonite, talc and muscovite Appenhalli Poorly crystallized kaolinite (about 70%), admixed with talc and illite Nandihalli Poorly crystallized kaolinite, traces of talc Rairangpur Dickite admixed with muscovite (about 15v/0) and t…
Reactions of Benzoyl Peroxide and Olefins Catalyzed by Copper Salts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of Benzoyl Peroxide and Olefins Catalyzed by Copper SaltsJay K. KochiCite this: J. Am. Chem. Soc. 1962, 84, 9, 1572–1579Publication Date (Print):May 1, 1962Publication History Published online1 May 2002Published inissue 1 May 1962https://pubs.acs.org/doi/10.1021/ja…
Paramagnetic Resonance of Tb 3 + Ions in CaW O 4 and Ca F 2
The paramagnetic resonance absorption spectra of ${\mathrm{Tb}}^{+++}$ ions in single crystals of CaW${\mathrm{O}}_{4}$ and Ca${\mathrm{F}}_{2}$ have been studied at 4.2\ifmmode^\circ\else\textdegree\fi{}K over a wide range of frequencies from 4 to 50 kMc/sec. The observed spectra fit a simple spin Hamiltonian $\mathc…
THE PRESSURE OF Ga2O OVER GALLIUM-Ga2O3 MIXTURES
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PRESSURE OF Ga2O OVER GALLIUM-Ga2O3 MIXTURESC. J. Frosch and C. D. ThurmondCite this: J. Phys. Chem. 1962, 66, 5, 877–878Publication Date (Print):May 1, 1962Publication History Published online1 May 2002Published inissue 1 May 1962https://pubs.acs.org/doi/10.1021/j100811…
Dielectric medium effects on loosely bound electrons
The problem of electron binding in solutions is treated on the basis of a continuum model. The polarizable medium is represented by a continuum, which can be characterized by macroscopic properties, e.g. the static and the optical dielectric constants. The motion of an additive electron is determined by its interactio…
Carrier Characteristics in Copper-Doped WO3 from Conductivity, Hall Voltage, and Thermal E.m.f. Studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarrier Characteristics in Copper-Doped WO3 from Conductivity, Hall Voltage, and Thermal E.m.f. StudiesM. J. Sienko and Paul F. WellerCite this: Inorg. Chem. 1962, 1, 2, 324–331Publication Date (Print):May 1, 1962Publication History Published online1 May 2002Published inissu…
Mullins Effect and Rubber-Filler Interaction
Abstract A previously-reported theory for the Mullins softening effect has been used to interpret various new data for the behavior of filled SBR, rubber under tensile load. The strength of the filler-rubber bond, the filler surface area per polymer molecule attachment, and the average filler surface separation have b…