Materials Literature
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Abstract The heat capacities of isopropylbenzene were measured with an adiabatic calorimeter for the crystal from 14 to 177.13 K (Tm), for the glassy state from 14 to around 126 K (glass transition temperature: Tg) and for the liquid from Tg to 313 K, with a sample of 99.93% purity. The heat and entropy of fusion were…
A general theory of the spin-dependent phonon Raman scattering in magnetic crystals is developed. The integrated Raman intensity as a function of temperature is expressed as S ( T )=( n 0 +1)| R + M < S 0 · S 1 >| 2 , where the first term represents the spin-independent part and the second one the spin-dependent part…
This paper provides a detailed survey and extension of certain properties of the stable regulator problem: determine\min\inf{u} \int\min{0}\max{\infty} x'Qx + u'u dtsubject to\dot{x} = Fx + Gu; x(0) = x_{0}; \liminf{t \rightarrow \infty} x(t) = 0whereQis not necessarily sign definite. First, equivalence conditions rec…
Data are presented to show that when linear polyethylene is quenched from room temperature to temperatures below 273 K, it exhibits a volume decrease for times long compared with that required to establish temperature equilibrium. The time, temperature, and density dependence of this decrease is shown to be consistent…
Abstract Bohn has compiled a list of polymer pairs on which compatibility studies have been reported. The list contains 13 polymer pairs for which, according to Bohn, compatibility as solids may be considered to be definitely established, at least within some regions of proportions. The approach used here is based on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCore electron binding energy study of group IIb-VIIa compoundsR. D. Seals, Robert Alexander, Larry T. Taylor, and John G. DillardCite this: Inorg. Chem. 1973, 12, 10, 2485–2487Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published ini…
Abstract Bei der Kristallisation orientierter Schmelzen aus isotaktischem Polypropylen erhält man Bandsphärolithe, die überwiegend aus ß‐Modifikation bestehen, wenn die Kristallisationstemperatur im Bereich von 100 bis 130°C liegt. Dabei ist es gleichgültig, auf welche Weise die Orientierung erzeugt wird. Der Anteil d…
We present herein a simplified approach to the capillary hysteresis phenomenon. This approach is based on a similarity hypothesis resembling that of Philip (1964), but different basic assumptions lead to a quite simple and handy method of predicting the relationships between the capillary head and the water content wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical reaction coordinates from crystal structure data. I.H. B. BuergiCite this: Inorg. Chem. 1973, 12, 10, 2321–2325Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.acs.org/doi/10.1021/ic50…
The program presented here performs an automatic indexing of powder patterns by means of a trial-and-error method. It has been optimized and presents a good flexibility. It can account for various additional information, known a priori. In addition, extensive error computations are included in it, leading to a good re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes of 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane, N-tetramethylcyclamE. Kent Barefield and Frank WagnerCite this: Inorg. Chem. 1973, 12, 10, 2435–2439Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inis…
The in-phase modulus and coefficient of diffusion of nylon 6 fibers are analyzed in terms of wide-and small-angle X-ray diffraction data. Both properties are examined in directions parallel and perpendicular to the fiber axis. The anisotropy in diffusion and mechanical coupling between the crystalline and amorphous ph…
The elastic constants of a hard-rod liquid crystal are calculated using the Onsager theory, with results similar to those given by Priest.Received 30 April 1973DOI:https://doi.org/10.1103/PhysRevA.8.2181©1973 American Physical Society
Abstract Eighteen binary metal oxides consisting of TiO2–MmOn, ZnO–MmOn and Al2O3–MmOn (MmOn: metal oxide) were prepared by the usual co-precipitation method, their acid amounts and strengths being determined by n-butylamine titration using various acid-base indicators. The acid strengths of fourteen of the tested bin…
A physical picture of the smectic $C$ phase is proposed in which the molecules rotate freely about their long axes in the smectic $A$ phase and this rotation is frozen out in the smectic $C$ phase. This picture is in contrast with the accepted view that the long axis of the molecules is normal to the smectic planes in…
A new analysis of polarization curves in the non-Tafel region in the vicinity of the corrosion potential is described which allows calculation of the polarization resistance (Rp) and the Tafel slopes (ba and bc). From these data instantaneous corrosion rates are calculated. Experimental data for the system Fe/1N H2SO4…
The exact renormalization-group approach of Wilson is used to study the critical behavior for $T>{T}_{c}$, $H=0$, and small $\ensuremath{\epsilon}>0$, of an isotropic ferromagnetic system in $d=4\ensuremath{-}\ensuremath{\epsilon}$ dimensions, with exchange and dipolar interactions between $d$-component spins. N…
A method is described for producing thin, hydrophilic support films for electron microscopy. These films have a well defined composition and can be made as thin as 10–15 Å. An application is described in which these hydrophilic films are used as ultrathin ``windows'' for frozen, aqueous specimens.
The emission, excitation and reflection spectra at 300, 80 and 15 K were obtained. The blue emission at 442 mµ was observed for CaS:Sb 3+ as well as the well-known yellow-green emission at 540 mµ. In the excitation or reflection spectra, A , B and C bands were found for all phosphors of Ca(S:Se):Sb 3+ investigated. Th…
By measuring the conductivity of stannic oxide crystals as a function of oxygen partial pressure at elevated temperatures, it is shown that the dominant native defect in SnO2 is a doubly ionizable oxygen vacancy. Both donor levels of this defect, the first 30 meV deep and the second 150 meV deep, are identified and a…