Mixed‐crystal infrared studies of chain folding in melt‐crystallized polyethylene
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Materials Literature
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Poly (dialkylphosphates) based on deoxyribose
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly (dialkylphosphates) based on deoxyriboseGrzegorz Lapienis, Stanislaw Penczek, and Julia PretulaCite this: Macromolecules 1983, 16, 2, 153–158Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue 1 February 1983https://p…
A trapped-hole center causing rose coloration of natural quartz
Abstract In rose-colored natural quartz crystals two new hole centers were detected and analyzed by electron paramagnetic resonance (EPR). A hole center with characteristic doublet and sextet hyperfine structures was identified as an O − ion bridging between a substitutional aluminum and phosphorus atom each. This cen…
Photocyclization of stilbenes. VII. Unusual fluorine atom rearrangement in the photocyclization of 1-fluoro[5]helicenes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocyclization of stilbenes. VII. Unusual fluorine atom rearrangement in the photocyclization of 1-fluoro[5]helicenesFrank B. Mallory and Clelia W. MalloryCite this: J. Org. Chem. 1983, 48, 4, 526–532Publication Date (Print):February 1, 1983Publication History Published on…
Gelation and fusion profiles of PVC dispersion resins in plastisols
Abstract Poly(vinyl chloride) (PVC) plastisols are used for coatings, films, sheets, foams, and rotational castings. In order to satisfy the requirements for the different applications, a variety of PVC dispersion resins are manufactured. The requirements for the plastisols are many: for example, good air release, vis…
The Low‐Energy‐Electron (LEE) Excitation of SnO2 : Eu Powder Phosphor; Fundamental Characteristics
The physicochemical properties and fundamental luminescent characteristics of powder were examined for use as low‐energy‐electron (LEE) excitation phosphor. Solubility limit of Eu into was 0.05–0.06 a/o and smaller mean diameter, higher resistivity (order of 10 6 Ω · cm), and more intensive diffused reflectance were o…
A brillouin-zone model for compositional variation in tetrahedrite
A Brillouin-zone analysis based on a nearly-free electron model for tetrahedrite, an important copper antimony sulfide, successfully explains the observed compositional limits for synthetic and natural tetrahedrites. Tetrahedrite should occur with greater than 2M and up to 208 valence electrons per unit cell (filling…
Electrical conduction in biotite micas
The direct current electrical conductivity tensor of biotitic phyllosilicates (mica) has been measured as a function of temperature, of electric field, and of chemical composition. It is found that conductivity depends exponentially upon iron impurity content, and upon electric field at high fields. The dependence upo…
Cross‐Linked Polyvinyl Alcohol Films as Alkaline Battery Separators
Cross‐linking methods have been investigated to determine their effect on the performance of polyvinyl alcohol (PVA) films as alkaline battery separators. The following types of cross‐linked PVA films are discussed: ( i ) PVA‐dialdehyde blends post‐treated with an acid or acid periodate solution (two‐step method, and…
Balangeroite, a new fibrous silicate related to gageite from Balangero, Italy
It is orthorhombic with a 13.85(4), b 13.58(3), and c 9.65(3)Aa; a sub-cell with c9 = c/3 is strongly evident. The X-ray powder pattern demonstrates an isostructural relationship with gageite; the strongest reflections are: 9.59(40)(110), 6.77(80)(020), 3.378(45)(410), 3.278(40)(140), 2.714(100)(050,510), 2.674(75)(15…
Low-temperature metallic conductivity in a metallomacrocyclic crystal: nickel phthalocyanine iodide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature metallic conductivity in a metallomacrocyclic crystal: nickel phthalocyanine iodideJens Martinsen, Richard L. Greene, Sharon M. Palmer, and Brian M. HoffmanCite this: J. Am. Chem. Soc. 1983, 105, 3, 677–678Publication Date (Print):February 1, 1983Publication…
Raman spectra of the transplutonium orthophosphates and trimetaphosphates
Abstract Raman spectra have been obtained from multimicrogram samples of crystalline transplutonium (americium through einsteinium) orthophosphates. Spectra were also obtained for americium, curium, and californium trimetaphosphates. Assignments of the major Raman bands and confirmation of the compounds' stoichiometry…
The determination of the elastic constants of a series of n-alkylcyanobiphenyls by anisotropy of turbidity
Measurement of the anisotropy of turbidity of aligned nematic liquid crystals in three selected geometries can yield the splay, twist, and bend elastic constants (K11, K22, and K33, respectively) which, along with the viscosity coefficients of the medium, govern director fluctuations that lead to a strong light scatte…
Experimental studies of the vapor phase nucleation of refractory compounds. II. The condensation of an amorphous magnesium silicate
Measurements of the critical partial pressure of SiO, Pc, required for the initiation of avalanche nucleation, as a function of ambient temperature in the system Mg–SiO–H2 have been obtained over the temperature range 750<T<1015 K. These are compared to similar measurements of Pc for the SiO–H2 system. I…
Protein model building by the use of a constrained–restrained least-squares procedure
The use of a macromolecular model building program, CORELS , which fits a series of constrained groups to a set of approximate guide coordinates, while simultaneously restraining the stereochemistry between groups, is described for protein molecules. The results of an application of this program to hen egg white lysoz…
Prediction of Finished Weight and Shrinkage of Cotton Knits— The Starfish Project
The "Starfish" project is a long term program of applied research that attempts to provide a sufficiently rigorous working method and a sufficiently comprehensive data base so that a rational system may gradually be developed for reliably predicting the shrinkage and dimensional properties of finished, knitted cotton…
Assessment of the Radiological Impact of Using Fly Ash in Cement
The radiological consequences of using fly ash as a component of cement are discussed. Measurements of the activity concentrations of the fly ash and cement are reported together with measurements of emanation coefficients and exhalation rates. The radon-exhalation rate was found to be significantly lower in concrete…
Characteristics of cylindritic crystallization of polypropylene
Abstract Characteristics of cylindritic crystallization of polypropylene were studied by means of optical microscopy. It has been shown that a distinct structural memory effect is observed during the cylindritic crystallization. This memory effect can be attributed to thermal stability of row nuclei giving rise to the…
Crystal and molecular structure of dihydroxo(5,10,15,20-tetraphenylporphinato)phosphorus(V) hydroxide dihydrate
The structure of dihydroxo(5,10,15,20-tetraphenylporphinato)phosphorus(V) hydroxide dihydrate, (C4H3,,02P+)(OH-).2H20, \nhas been determined from three-dimensional diffractometer data. It crystallizes in the monoclinic space group P2,/c with \na = 14.636 (4) A, b = 13.953 (3) A, c = 17.592 (4) A, /3 = 90.21 (2…
The effect of some contrast agents in the lung: an experimental study in the rat and dog
Radiographic and histologic studies were carried out in rats and dogs after the instillation of Barosperse, Hypaque-35%, metrizamide, MP10013 (a nonionic iodine-containing agent), and isotonic saline into the lungs of these animals. In addition, blood gases were examined using these agents in dogs. Given aspiration of…