Formation of a tangsten phenyl hydride derivatives from benzene
In the presence of dienes the dihydride (πC5H5)2 WH2 reacts with benzene to give the phenyl derivative (πC5H5)2 WHPh.
Materials Literature
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Localized and Self‐Trapped Excitons in CsI
Abstract Additionally to the well‐known 3380 Å band in the excitonic transitions of CsI at LHeT a new emission band at 2900 Å is reported and its behaviour is studied as a function of temperature. Experimental evidence is given which establishes the connection of the 2275 Å absorption band with localized exciton trans…
Reaction Kinetics of Uranium and Deuterium
A uniform and adherent layer of β-UD3 was formed on uranium when uranium reacted with deuterium in the temperature range 175–350°C and pressure range 100–10 270 torr. The rate of reaction was controlled by diffusion of deuterium across this product layer. Reproducible results were obtained only with D2 of very high pu…
Radical Copolymerizabilities of N-Substituted and N, N-Disubstituted Methacrylamides
N-置換メタクリルアミド類 24 種の赤外吸収スペクトルを検討すると, N-置換基の電子供与性が大であるほどνc=0とVc=cは低波数シフトを示し, C=C, C=0, N上の非共有電子対は非交叉共役系をなしていることがわかった。アクリル酸メチル (M1) と N-置換メタクリルアミド (M2) のラジカル共重合を60℃で行なった。モノマー反応性比はつぎのごとくなった。そしてポリアクリル酸メチルラジカルに対するモノマーの相対反応性 log 1/r1 の Taft プロットを画くと極性反応定数ρ*は負の値となった。このモノマー反応性に対する置換基効果は赤外線吸収スペクトルによって示された非交叉共役効果により説明できた。重合しやすい一…
Thermal decomposition of oxalates. Part XI. Dehydration of calcium oxalate monohydrate
A kinetic study has been made of the isothermal dehydration of calcium oxalate monohydrate to the anhydrous oxalate at various pressures of water vapour by use of a thermogravimetric balance. The rate of dehydration was found to be dependent upon the water vapour pressure. The reaction rate for dehydration decreased s…
Crystal nucleation in lithium silicate glasses
The development of the microstructure of simple glass-ceramics, of molar compositions 70SiO2·30Li2O and 69SiO2·30Li2O·1P2O5, has been studied by the techniques of transmission electron microscopy, optical microscopy, X-ray powder diffraction and electrical loss measurements. Surface nucleation of lithium disilicate cr…
Benzimidazole polymers from aldehydes and tetraamines
Abstract A new method for the preparation of benzimidazole polymers is described. The solution polymerization of aromatic tetraamines with isophthalaldehyde bis bisulfite adduct in N , N ‐dimethylformamide (DMF), N , N ‐dimethylacetamide (DMAc), N ‐methyl‐2‐pyrrolidone (MP), and dimethyl sulfoxide (DMSO) produced poly…
Fast-Decay Phosphors
Decay times, efficiencies, and spectral energy distributions of a number of Ce 3+ ‐activated phosphors have been determined. Decay times as short as 25–30 nsec are found for , , and ; the two first‐named phosphors show a weak, the last a strong, afterglow. The techniques of measurement have been described.
Luminescent Properties of Eu2+ and Eu2+ + Mn2+ Activated BaMg[sub 2]Si[sub 2]O[sub 7]
Abstract not Available.
Thermal Conductivity of Reinforced Plastics
The addition of reinforcing fillers to thermoplastics can produce composite materials which combine enhanced physical properties with ease of processing. For many materials applications, the design engineer needs information on thermal properties, such as thermal conductivity and heat capacity. Published data on therm…
Gas-phase Raman spectra of some dihalides of zinc and mercury, of ‘GaCl 2 ’ and of GaCl 2 Br and GaBr 2 Cl
The Raman spectra of HgX2(X = Cl, Br, or l), ZnX2, and HgXY (X,Y= Cl, Br, or l) are reported for the gaseous monomeric species. In no case was a deformation mode identified, although formally this mode is active for linear HgXY. When the compound ‘GaCl2’ was examined in the gas phase only bands due to GaCl and GaCl3 w…
Les coefficients de magnétostriction
Nous proposons une notation harmonique cohérente pour les énergies élastique, magnétoélastique et magnéto-cristalline et pour la magnétostriction des cristaux de symétrie cubique, quadratique, orthorhombique et hexagonale. Nous limitons notre description aux déformations externes des ferromagnétiques et des ferrimagné…
The interpretation of rhombic g tensors in copper complexes
The information which can be derived from rhombic g values is discussed, and the g values reported for a number of copper complexes of known structure are used to calculate ground-state wavefunctions of the form ψ≈|cx2+ey2+fz2〉. In several low-symmetry complexes the ground-state can only adequately be described in ter…
The novel magnetism and crystal structure of the complex di-µ-hydroxybis(bipyridyl)dicopper( II ) sulphate pentahydrate
For the complex di-µ-hydroxybis(bipyridyl)-dicopper(II) sulphate pentahydrate the effective magnetic moment per copper atom rises from 1·94 B.M. to 2·04 B.M. as the temperature is lowered from 298 to 84 K; the binuclear nature of the complex has been confirmed by a crystal structure determination.
Stereoscan observations on the pollen genus Classopollis Pflug 1953
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Stoichiometry of Anodic Copper Dissolution at High Current Densities
The influence of current density, flow rate, and electrolyte composition on the stoichiometry of anodic copper dissolution was investigated under conditions comparable to those of electrochemical machining. Weight loss measurements, x‐ray diffraction, and chemical analysis were used for the characterization of the dis…
Electrochemical Characteristics of Iron in Acidic Solutions Containing Ring-Substituted Benzoic Acids
The electrochemical behavior of Armco iron in in the absence and presence of ring‐substituted benzoic acids have been investigated by the measurement of the corrosion potentials, open‐circuit capacitances, potential‐current polarization characteristics, potential transients, and corrosion rates. Anomalous behavior was…
Lattice Vibrations of Cu2O at the Long Wave Limit
Abstract A study of the lattice dynamics of cuprite at the centre of the Brillouin zone is made and the force constants and the effective charge deduced. The energies of the optically inactive phonons are calculated and their symmetry determined. The symmetry of the upper valence band of the crystal is identified.
Studies of the hydrogen held by solids. Part 17.—The ortho-para H 2 Conversion and H 2 –D 2 exchange reactions over a transition alumina
The rates of the H2–D2 exchange, the o-p H2 and p-o D2 conversions were measured on the surfaces of a very pure alumina, with and without a portion of the sites selectively poisoned with CO2. These data were supplemented with results obtained from surface dehydroxylated to different extents. When the alumina was dehyd…
Mathematical Study of Galvanic Corrosion Equal Coplanar Anode and Cathode with Unequal Polarization Parameters
This paper gives a theoretical analysis of the distribution of potential and current density on the surface of a coplanar galvanic cell in which the polarization parameters for cathode and anode are unequal. The potential at any point can be represented as a Fourier series, in which the coefficients themselves are inf…