Materials Literature
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Abstract Cellulose triacetate I is yielded from cellulose II of mercerized cellulose and rayons in heterogeneous acetylation with lower swelling pretreatment. Both cellulose triacetates I and II with highly ordered structure substantially are converted into cellulose II on saponification. It is possible to obtain tran…
The Mössbauer parameters of a number of trihydroxostannates(II) and their decomposition products and of some basic tin(II) salts are reported and discussed in terms of the tin species likely to be present in these materials.
Solid potassium nitrosodisulphonate (Fremy's Salt) is shown to exist in two distinct crystalline forms. An improved preparation, and crystallisation methods for both forms are given. Stability of both solids and solution is discussed in detail. The forms are compared in terms of their i.r. spectra, magnetic properties…
Abstract Die Sprödigkeit vieler intermetallischer Verbindungen auch bei metallischem Bindungscharakter läßt einen Zusammenhang mit der Gittergeometrie vermuten. Der Einfluß der Atomanordnung auf das Gleiten der Versetzungen wird für die Lavesphasengitter des MgZn 2 ‐Typs (C 14) und des MgCu 2 ‐Typs (C 15) vergleichend…
, was computed using the reaction enthalpy based on the second law.
La comparaison des intensités de signaux de résonance paramagnétique électronique de solutions de biradicaux à échange interélectronique faible, fort ou intermédiaire, montre que le téréphthalate est un biradical à échange faible.
Abstract Lothe's formula for the self‐force on a bent dislocation and Brown's formula for the stress in the plane of a planar loop are generalized to be valid for uniformly moving dislocations when the energy factor is replaced by the Lagrangian factor. Application to straight dislocations in isotropic media shows tha…
Dans DyCrO3 (groupe Pbnm — D162h), les spins de Cr s'ordonnent à TN1 = 146 °K dans un mode G z. Ceux de Dy s'ordonnent à TN2 = 2,16 °K dans une maille qu'il faut doubler selon a et b. On détermine les 8 représentations irréductibles du groupe Pbnm associées au vecteur d'onde k = [1/2 1/2 0] . Celles-ci sont toutes à u…
Magnetic studies have been carried out down to liquid-nitrogen temperatures on NN′-ethylenebis(salicylideneiminato)cobalt(II) and many of its ring-substituted derivatives. No relationship between the detailed magnetic properties and oxygen-carrying ability of this type of compound has emerged. A variety of magnetic be…
Raman spectra of a range of salts containing anions of formula MX62– are reported. Samples were examined in a laser Raman spectrometer as solids and as solutions in acetonitrile and aqueous acids. In addition Raman spectra were recorded of solutions of selenium and tellurium dioxides dissolved in concentrated hydrohal…
The thermodynamic cis⇌trans equilibrium in stilbene and its derivatives can be established at room temperature only by the use of catalysts such as atomic iodine. The latter has now been used to determine the above equilibrium in a number of cases. The fraction of cis-isomer at equilibrium is ca. 0·002 in stilbene and…
Description The Symposium on Electron Fractography was presented during the Seventieth Annual Meeting of the Society held in Boston, Mass., 25—30 June 1967. The symposium was sponsored by Committee E24 on Fracture Testing of Metals. The symposium chairman was C. D. Beachem, Naval Research Laboratory.
Abstract Coordination complexes containing hexa‐acetic acid metal groups are reported with the divalent cations Mg, Mn, Co, Ni, Cu and Zn and with the tetrafluoroborate, perchlorate and nitrate anions. Visible spectra, some infrared data and isomorphism according to X‐ray powder diagrams are recorded. The compounds ar…
The preparation of eleven heteropolytungstate anions, X2ZW17O62H2x–(X = P or As; Z = Mn, Co, Ni, or Zn) is described. These include the first heteropolyanions with MnIII as heteroatom. The stabilities of the anions towards acid and base, and the redox potentials and magnetic moments of the Z heteroatoms are reported,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Behavior of Exhaust Gas Catalytic ConvertorJoseph Vardi and W. F. BillerCite this: Ind. Eng. Chem. Process Des. Dev. 1968, 7, 1, 83–90Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Published inissue 1 January 1968https://pubs.ac…
Abstract Fluorsulfurylisocyanat ( 1 ) reagiert mit Verbindungen, die reaktionsfähigen Wasserstoff enthalten. Auf diese Weise wurden hergestellt: equation image Diese bilden mit Alkali‐, Erdalkali‐ und quartären organischen Kationen gut kristallisierbare Salze. Die Reaktion von Fluorsulfurylisocyanat mit SF 4 führt zu…
The magnetic properties of Mn(salen) and several other manganese(II) Schiff-base complexes have been studied over the temperature range 80–300°K. These measurements, coupled with X-ray powder data, suggest a binuclear structure for Mn(salen), in which there is antiferromagnetic exchange. The data for the other complex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBoron photochemistry. II. Irradiation of sodium tetraarylborates in alcohol solutionsJack L. R. Williams, J. C. Doty, Patrick J. Grisdale, Thomas H. Regan, Glenn P. Happ, and D. P. MaierCite this: J. Am. Chem. Soc. 1968, 90, 1, 53–55Publication Date (Print):January 1, 1968Pu…
A stability study of a synchronous machine is performed by applying the Nyquist stability-criterion to the equations which describe the behavior of the machine during small displacements about a steady-state operating point. This investigation reveals that, in some cases, machine instability can occur at low operating…
I t is flOW /)o ssible to unify th e descnj)tion of the J)lastic flow that occurs ill various circumstances; rangillg )i"om creep, through ordinaty tensile tests, to high-speed impact.T his is dOlle by using a sim/)le d)mamic statistical theOlY ill which the al'erage behavior of a large collection of dislocations is c…