Materials Literature
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Abstract Volatilization of NH 3 from NH 4 ‐ ‐N salts applied to the surface of a calcareous soil was investigated. Ammonia losses from surface applied NH 4 F, (NH 4 ) 2 SO 4 , and (NH 4 ) 2 HPO 4 were 68, 54, and 51%, respectively, of the added NH 4 ‐ ‐N in 100 hours. Ammonium nitrate, NH 4 Cl, and NH 4 I lost 18, 18,…
A procedure is described for optimizing the extraction of information from the diffraction data of a glass. A least-squares technique that minimizes the spurious detail in the radial distribution function (RDF) at small and large interatomic distances is employed both to isolate that portion of the total intensity fun…
Abstract A new crystal modification was found in poly(ethylene oxide) stretched about two‐fold after necking at room temperature. An x‐ray diffraction analysis indicated that the planar zigzag molecule passes through a triclinic unit cell with parameters α = 4.71 Å, b = 4.44 Å, c (fiber axis) = 7.12 Å, α = 62.8°, β =…
The solution properties of the nickel(II), copper(II), and zinc(II) derivatives of tetracarboxyphenylporphine (TCPP) and tetra(N-methylpyridyljporphine (TMPyP) have been investigated. At μ = 0. 1 M and 25°, NiTMPyP, CuTMPyP, ZnTMPyP, and ZnTCPP show no tendency to aggregate. However, under these conditions NiTCPP and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of lead oxidesK. S. Kim, T. J. O'Leary, and Nicholas. WinogradCite this: Anal. Chem. 1973, 45, 13, 2214–2218Publication Date (Print):November 1, 1973Publication History Published online1 May 2002Published inissue 1 November 1973https://pubs.acs.or…
Abstract We developed a new micro-scale procedure for determination of protein in cerebrospinal fluid and urine. The sample (50 µl) is mixed with a trichloroacetic acid—Ponceau S dye solution. The proteins, together with a proportional amount of dye, are precipitated and the red precipitate is dissolved in dilute sodi…
Abstract It has been shown that the only way to predict the size of the PTC effect displayed by a crystalline polymer when filled with conductive particles is through the knowledge of the glass transition point of the polymer. The size of the PTC anomaly is found to decrease sharply with rise in glass transition tempe…
Optical transmittance and reflectance of continuously varying anisotropic planar media, such as nematic liquid crystals in Schadt–Helfrich twist cells or cholesterics between parallel rubbed surfaces, have previously been computed with a 4 × 4 matrix method by considering the medium as broken up into many thin paralle…
The ch ange in refractiv e index with temperature has been determined for some oxide glasses from about -200 to 700 C. The chan ge in refractive index with appli ed hydrostatic pressure has been determined at room temperature from a pressure of 10 5 to 10 8 Pa. All measurements were made using the yellow s pectral lin…
Research Papers Tool Wear and Tool Life N. H. Cook N. H. Cook Massachusetts Institute of Technology, Cambridge, Mass. Search for other works by this author on: This Site PubMed Google Scholar Author and Article Information N. H. Cook Massachusetts Institute of Technology, Cambridge, Mass. J. Eng. Ind. Nov 1973, 95(4):…
This article gives a review of the Green-function method for the calculation of the static properties of lattices with point defects. This method, based upon the Born-von Kármán model of a lattice, uses the zero frequency limit of the phonon Green function which gives the static response of the lattice to an applied f…
The role played by inorganic chemical additives in fire retardancy and flame inhibition is considered. Particular attention is given to the molecular level aspects of commercially important systems containing compounds of antimony, halogens, and phosphorus. The flame inhibiting function of metal containing additives i…
Epidermal thickness has been accurately measured on 214 samples of skin from 188 volunteers. Variations with the individual, body site, sex and age are described and discussed. An original technique of measurement has been developed which has several advantages over conventional methods. In particular, quick straight‐…
Abstract Specimens of poly(vinylidene fluoride), crystal form II, annealed at different temperatures between 130 and 180°C were characterized by specific volume measurements, differential scanning calorimetry (DSC), and electron micróscopy. The degree of crystallinity calculated from the specific volume changed only b…
Elastic- and inelastic-scattering cross sections for low-energy electrons in Hg have been obtained through comparison of experimental and calculated transport data. Electron-electron interactions and superelastic collisions are incorporated into the numerical solution for the electron-energy distribution. The electron…
An outline is given of the effects of the various processes occurring at a structural phase transformation on the quantities measured in an ultrasonic experiment: sound velocity and attenuation. Various theoretical approaches are discussed as well as experimental results.
The advantages of a systematic application of the method of virtual power are exemplified by the study of continuous media with microstructure. Results on micromorphic media of order one are easily found and the equations of motion for the general micromorphic medium are established for the first time. Various interes…
Data on the preparation, structure, and various properties of the double tungstates and molybdates (EO4) of the alkali (M) and rare earth (R) metals with the composition RM(EO4)2 have been summarised and systematised. The regular features of the change in the symmetry, polymorphism, and nature of the fusion with chang…
Intrinsic photoemission and photoconduction of polyethylene in the photon energy range 7<E<14 eV have been experimentally investigated. Both phenomena are parabolic in E with the same threshold energy E G =8.8 eV. The main features of a model that accounts for the observations are: (a) E G is the intrinsic electron-ho…
The temperature dependence of the electrical conductivity and Seebeck coefficient for the polymer chain system ${(\mathrm{SN})}_{x}$ has been measured along the chain axis from 4.2 to 300\ifmmode^\circ\else\textdegree\fi{}K. The data show the system to be metallic over the entire temperature range studied, with a smal…