Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Since the internal energy $E$ is a monotonically increasing function of the temperature $T$, the moment $M(T)$ can be expressed as a function of internal energy $E$. The corresponding form of $E(M)$ is focused on in this paper. For ferromagnets, the two-dimensional Ising model is used to obtain the exact form of $E(M)…
In the systems Na(K)-Zn(Cd)-As(Sb) we found the following phases: NaZnAs, NaZnSb, KCdAs, KCdSb (tetragonal symmetry); KZnAs, KZnSb (hexagonal symmetry); NaCdAs, NaCdSb (orthorhombic symmetry)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical relaxation and equilibrium studies of association in aqueous solutions of bolaform detergents. 1. Dodecane-1,12-bis(trimethylammonium bromide)S. Yiv, K. M. Kale, J. Lang, and R. ZanaCite this: J. Phys. Chem. 1976, 80, 24, 2651–2655Publication Date (Print):November 1…
Extruded filaments of unmodified polypropylene (PP) with and without antioxidant were implanted subcutaneously in hamsters in order to determine their rate of degradation. Specimens were removed periodically during a 5 month test period and analyzed by infrared spectroscopy and dynamic mechanical testing. The analyses…
Abstract The effect of quasi‐hydrostatic pressures up to 100 kbar is investigated on the phase transitions of Fe 1− x Rh x alloys by resistivity measurements. The pressure dependence of the first order antiferromagnetic (AF) to ferromagnetic (FM) phase transformation temperature d T k /d p = 4.4 to 5 K/kbar. The press…
Magnetic and structural properties are presented for new ferromagnetic compounds of the form ${\mathrm{Rh}}_{2}\mathrm{Mn}X$ where $X$ is Al, Ga, In, Tl, Sn, Pb, and Sb. The exchange is described in terms of competing ferromagnetic Mn-Rh-Mn interactions and antiferromagnetic Mn-Mn interactions.
An analysis of transient multidimensional solidification in the presence of a growing shrinkage cavity has been performed. The enthalpy model, which had previously been applied only for cases with no density change, has been extended to accommodate substances which undergo a change of density upon phase change. The ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn improved synthesis of octaethylporphyrinJohn B. Paine III, William B. Kirshner, David W. Moskowitz, and David DolphinCite this: J. Org. Chem. 1976, 41, 24, 3857–3860Publication Date (Print):November 1, 1976Publication History Published online1 May 2002Published inissue 1…
Raman spectra of glasses in the system K 2 O‐PbO‐SiO 2 and of crystalline K 2 O·4SiO 2 , K 2 O·2SiO 2 , K 2 O·SiO 2 , PbO, PbO· SiO 2 , K 2 O· PbO ·4SiO 2 , K 2 O· 4PbO ·8SiO 2 , and K 2 O ·2PbO· 2SiO 2 are reported and used to identify some of the structural units of the glasses. It is indicated that, in the glasses,…
SUMMARY The physical basis of microanalysis using measurements of electron energy losses associated with atom ionization or plasmon excitation in thin electron microscope specimens is explained in a simple manner. In addition the equipment used to resolve both the high and low energy regions of the loss electron spect…
Anodic oxidation products in of both planar and porous iron electrodes have been investigated with SEM techniques. On the first discharge level well‐defined crystallites of are formed, while on continued discharge the products become sludge formed, probably consisting of hydrated . The morphologies support the dissolu…
The formation of strontium hexaferrite SRFE12O19from pure iron oxide and strontium carbonate has been studied by means of dynamic high temperature X-ray diffraction, thermal analysis, and thermogravimetry. The formation in air passes through two endothermal reactions: SrCo3+6α-Fe2O3+(0.5-x)\frac{1}{2}O2→ SrCo3+5.5α-Fe…
Photoeffects at polycrystalline, semiconducting barium titanate were investigated. Photocurrent efficiencies were related to solid‐state properties and agreement was found between donor densities calculated from efficiency‐potential plots and those calculated from Mott‐Schottky plots. The existence of a significant te…
Semipermeable microcapsules were prepared using biodegradable material as the enclosing membranes. For instance, polylactic acid was used as membrane material to microencapsulate biologically active materials. Asparaginase microencapsulated within polylactic acids functions effectively in converting external asparagin…
The elimination and retention of a new, fully synthetic plasma prosthesis of Czechoslovak origin under the working name of Duxon (poly[N-(2-hydroxypropyl)methacrylamide]) was investigated in experiments on rabbits by using a 14C-labeled polymer. Results published earlier on elimination have been confirmed and extended…
Polymerization of collagen in vitro has been studied with the electron microscope at early time points of fibril assembly. We have found morphologically distinct stages of aggregation, which we suggest represent successive steps in fibril formation. Linear growth of the fibril appears to occur by the tandem addition o…
1. A fragment of human subcomponent C1q was prepared by limited proteolysis with pepsin at 37 degrees C for 20 h, and at pH4.4, followed by gel filtration on Sephadex G-200. This fragment was shown to contain all the collagen-like features known to be present in the intact molecule [Reid (1976) Biochem. J. 155, 5-17].…
The bacterial phosphotransferase system (PTS) catalyzes the transfer of the phosphoryl group from phosphoenolpyruvate to its sugar substrates, PTS sugars, concomitant with the translocation of these sugars across the bacterial membrane. The phosphorylation of a given sugar requires four proteins, two general proteins,…
The stress corrosion cracking (SCC) of mild steel in saturated ammonia vapor was studied by slow straining of a hollow specimen, which could be heated or cooled in relation to the temperature of the liquid. SCC was effectively prevented if the specimen was heated 1 to 2 C above the temperature of the liquid, but SCC d…
Single crystal specimens of niobium with axes near 〈111〉 and 〈011〉 have been deformed at 295 K in either tension or compression in order to investigate the formation of kink bands in body centred cubic structures. Slip occurred in the 〈111〉 direction on both {10} and {11} planes and the relative values of the critical…