Materials Literature
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For the isotopic blend of polystyrene (PS) PS/deutero PS (M=106 dalton), the Flory–Huggins interaction parameter χ(φ,T) was determined by means of the structure factor S(Q) measured by small angle neutron scattering (SANS). From χ(φ,T), the miscibility gap and the corresponding spinodal line was evaluated with a criti…
The theoretical aspects of magnetic resonance (MR) imaging contrast agents are reviewed, and their current applications to the central nervous system (CNS) and their future applications are discussed. Profound differences exist between contrast agents used for MR imaging and computerized tomography (CT). In MR imaging…
Neutron-diffraction experiments were performed in order to investigate the structure of the thermoelastic martensite of the ${\mathrm{Ni}}_{62.5}$${\mathrm{Al}}_{37.5}$ alloy. The following results were obtained: (i) the low-temperature phase has a seven-layered monoclinic unit cell (7M martensite). (ii) Anomalous shi…
A short review of acoustic properties of a number of disordered ferroelectric materials is made. In the first place such characteristics as velocity of ultrasound elastic waves and their attenuation in a phase transition range are discussed. We show that rather wide class of compounds (relaxators) can be identified as…
A sol‐gel process for the preparation of glass‐like cordierite and ceramic oxide powder is described. Metal alkoxide precursors were dissolved in 2‐methoxyethanol and the metal cations were complexed using 2,4‐pentanedione to overcome different hydrolysis rates of metal alkoxides which lead to microscopic inhomogeneit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of ternary polymer blends composed of three miscible binariesG. R. Brannock and D. R. PaulCite this: Macromolecules 1990, 23, 25, 5240–5250Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990h…
Bovine carbonic anhydrase B (CAB) is chosen as the model protein to study the phenomenon of protein aggregation, which often occurs during the refolding process. Refolding of CAB from 5 M GuHCl has been observed by quasi-elastic light scattering (QLS), which confirms the formation of a molten globular protein structur…
The existing underground transmission system in the United States is worth about $5 billion. To optimize the return on that investment and on further investment in the growing system, EPRI has sponsored research to develop periodic and continuous diagnostic procedures and methodologies for evaluating underground cable…
Abstract The electrical conductivity (σ) and thermoelectric power ( Q ) of polycrystalline lithiumzinc ferrites sintered at 1200 and 1300 °C was investigated as a function of temperature. The porosity and activation energy were calculated. It was found that the electrical conductivity is progressively increasing with…
Abstract Moisture can be absorbed from the air by PVC plastisols and by the fused product. Water in plastisols can contribute to defects in films, sheet goods and foam products, usually in the form of depressions or craters. Water absorbed by thermoformable foam PVC sheets can result in defects in the molded product,…
The effect of post sintering heat treatments on the intrinsic coercivity of Fe-Nd-B magnets is studied. It is shown that the large anisotropy in thermal expansion coefficients in the a and c directions of the tetragonal unit cell as well as the anisotropy in thermal expansion properties between the matrix and the grai…
Abstract Rb 2 K 4 Co 2 O 5 wurde erstmals durch Erhitzen inniger Gemenge der binären Oxide in Form von dunkelroten Einkristallen und Pulver erhalten (vor Verreiben Rb:K:Co = 1,2:3,2:1; Ni‐Zylinder, 570°C, 20d). Die Strukturaufklärung [Vierkreisdiffraktometerdaten; PW 1100; AgK ‐Strahlung; 401 von 607 I 0 (hkl); R = 9,…
Article Overlooked trigonal symmetry in structures reported with monoclinic centred Bravais lattices; trigonal description of Li8Pb3, PtTe, Pt3Te4, Pt2Te3, LiFe6Ge4, LiFe6Ge5, CaGa6Te10 and La3.266Mn1.1S6 was published on December 1, 1990 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume…
Abstract The compatibility of suspension poly(vinylchloride) [PVC] with twelve different plasticizers was determined using calculated compatibility predictors, as well as actual measurements of compatibility. Solubility parameters were capable of classifying plasticizers of a given family in terms of their compatibili…
Abstract The oriented ingots of isostructural compounds Sn 2 SbS 2 I 3 and Pb 2 SbS 2 I 3 were prepared using a modified Bridgman method. The lattice parameters of the prepared orthorhombic compounds have been determined by a X‐ray powder diffraction analysis. From the spectral response of the photoconductivity the fo…
The limits of high-power, high-repetition-rate operation of photoconductive switches utilizing diamond are explored. To evaluate diamond as a photoconductor for high-power switching applications, the following experiments were performed: (1) measurement of switch resistance as a function of the bias electric field; (2…
Data from a single defected fuel element operating in-reactor are used to develop a physically based model for describing the increased release of iodine and noble gas fission products to the primary coolant following a reactor shutdown and start-up. Iodines are only released on reactor shutdown, whereas both species…
This report presents a descriptive model for the expansion and fragmentation behavior for the case of a single-point, end-initiated cylindrical warhead. This model divides the overall behavioral process of the warhead case into four distinct zones of behavior which occur between initial case motion and fragment impact…
Abstract The effects of (OH)/F substitutions on thermally induced reactions in the apophyllite group have been investigated using TGA and DTA methods, supplemented by X-ray diffraction, infra-red and other techniques to identify the products of reaction. The samples studied cover the range between fluorapophyllite and…
Abstract The rate theory of RA 2 +RB 3 polymerization has been developed to enable the concentrations of the smallest inelastic loops and the resulting reductions in elastic shear modulus at complete reaction to be evaluated. Reduction in modulus is expressed as M c /M° c , the effective molar mass of chains between e…