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Abstract The crystal structure of polyketone (1:1 ethylene/carbon monoxide copolymer) obtained by γ‐irradiation copolymerization of ethylene and carbon monoxide was determined by x‐ray diffraction. An orthorhombic unit cell was found, having space group D (Pnam) of dimensions a = 7.97, b = 4.76, c (fiber axis) = 7.57…
The original theory of thermally stimulated emission is extended to include the effect of a temperature dependent trapping cross section. A method is proposed whereby the ionization energy and temperature dependent capture cross section of a set of identical trapping states may be determined from the half-width and sh…
Measurements have been made of the electrical resistivity and the Hall constant of the carbides of the fourth and fifth group transition metals at room temperature in order to clarify the electronic structure of these compounds. The Hall coefficients are of the order of -10 -3 coul -1 cm 3 for the fourth group carbide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new plotting of the BET methodTominaga. Keii, Tokuji. Takagi, and Setsuko. KanetakaCite this: Anal. Chem. 1961, 33, 13, 1965Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Published inissue 1 December 1961https://pubs.acs.org/doi/10.1…
Existing calculations of the total absorption coefficient are generally based on the assumption that all the primary radiation energy which is converted into Comptonscattered radiation escapes from the material without significant absorption. This paper extends this basic assumption to include fluorescent and annihila…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Ultraviolet Irradiation of Model Compounds Related to Cellulose1ANDREW BEÉLIK and J. KELVIN HAMILTONCite this: J. Org. Chem. 1961, 26, 12, 5074–5080Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Published inissue 1 December 1961htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMECHANISM OF THE PHOTO-INITIATED POLYMERIZATION OF METHYL METHACRYLATE AT ZINC OXIDE SURFACES1Joseph C. Kuriacose and M. Clare MarkhamCite this: J. Phys. Chem. 1961, 65, 12, 2232–2236Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Publi…
Measurements on single-crystal silicon show that the thermal conductivity varies nearly as ${T}^{\ensuremath{-}1}$, from 1.25\ifmmode\pm\else\textpm\fi{}0.19 w/cm C\ifmmode^\circ\else\textdegree\fi{} at 30\ifmmode^\circ\else\textdegree\fi{}C, to 0.46\ifmmode\pm\else\textpm\fi{}0.07 w/cm C\ifmmode^\circ\else\textdegree…
Eigenschaften und Beziehungen von Symmetriegruppen werden benutzt, um die Struktur der Mikrowellenspektren von Molekülen mit zwei gleichen oder verschiedenen behindert drehbaren dreizählig-symmetrischen Molekülgruppen zu klären. Es ergeben sich für eine Reihe verwandter Molekültypen Entartungsgrade der Eigenwerte, Aus…
The conversion of boehmite to transition aluminas and to alpha (corundum) was studied with ( a ) fibrillar colloidal boehmite, about 50 a.u. in diameter, ( b ) finely divided boehmite in the form of thin elongated platelets, and ( c ) macroscopic boehmite crystals. In the range 500 o to 700 o C., ( a ) was converted t…
Specimens of biotite, muscovite, artificial fluorophlogopite, and muscovite annealed at 900°C were examined using an electron microscope after having been covered with a uranium layer and irradiated in a reactor. Tracks due to fission products appeared on every specimen except biotite, and the respective diameters wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PREPARATION OF trans 1,4-POLYBUTADIENE BY RHODIUM SALTS IN SOLUTIONRobert E. Rinehart, Homer P. Smith, Harry S. Witt, and Hendrik Romeyn Jr.Cite this: J. Am. Chem. Soc. 1961, 83, 23, 4864–4865Publication Date (Print):December 1, 1961Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE KINETICS OF SINTERING OF PLATINUM SUPPORTED ON ALUMINAR. A. Herrmann, S. F. Adler, M. S. Goldstein, and R. M. DeBaunCite this: J. Phys. Chem. 1961, 65, 12, 2189–2194Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Published inissue 1…
The crystal structure of tetragonal tellurium dioxide was studied using neutron diffraction. The space group is either P 4 1 2 1 2 or P 4 3 2 1 2. The lattice constants are: a = 4.796 Å, c = 7.626 Å, c / a = 1.59. New oxygen-atom parameters were determined. The coordination polyhedron of the tellurium atom is a distor…
The relations between the structure, crystal chemistry, chemical bonds involved, and the infrared spectra of layer‐structure silicates established on the basis of recent experiments are discussed and summarized.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Calculation of Electrochemical Kinetic Parameters from Polarographic Current-Potential CurvesLouis Meites and Yecheskel IsraelCite this: J. Am. Chem. Soc. 1961, 83, 24, 4903–4906Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Publis…
A mathematical treatment of steady-state dendritic growth from pure and alloy liquids has been developed for isothermal and nonisothermal dendrites. The velocity of dendritic growth, dendrite size, dendrite direction, and the alloy content of the dendrite have been calculated as a function of the bath supercooling, th…
Research Article| December 01 1961 Sexual Cycles of Three Green Algae for Laboratory Study Robert W. Hoshaw Robert W. Hoshaw Search for other works by this author on: This Site PubMed Google Scholar The American Biology Teacher (1961) 23 (8): 489–499. https://doi.org/10.2307/4439731 Views Icon Views Article contents F…
The potassium salt of o -nitrophenol crystallizes in space group C 2/ c with 8 molecules of C 6 H 4 · NO 2 · OK · ½ H 2 O in the unit cell of dimensions a = 24.73 Å, b = 5.21 Å, c = 11.96 Å and β = 105.15°. The structure has been solved by the heavy-atom method and has been refined by Fourier and least-squares synthes…
The theory of spherical probes based on the impact parameter of the carriers is given. Fields outside the sheath are neglected, which is justified for electron collection. The results are obtained more directly than by Mott-Smith and Langmuir. General results such as the transition from impact parameter limitation to…