Materials Literature
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Abstract New soluble cellulosics with interesting molecular structures and properties were obtained by the acylation of remaining hydroxyl groups of pure, homogeneously synthesized p ‐toluenesulfonylcelluloses of different degree of p ‐toluenesulfonyl (tosyl) substitution (DS Tosyl ) ranging from 0.5 to 2.0 in pyridin…
Summary The cation exchange capacity (CEC) of 18 samples (<2 mm) of five acid soils developed on granite or gneiss was measured before and after H 2 O 2 treatment from pH‐unbuffered extraction solution (1 N KCl). The pH in water of the soils ranged from 3.4–4.7. The samples were separated into seven fractions (<…
The grain‐growth data presented in a companion paper for the Al 2 O 3 ‐SiC system are analyzed. Central to the analysis is the experimentally observed relationship between the fraction of particles on grain boundaries, φ, and the average grain size, G. This relationship is included in both the equilibrium‐grain‐size e…
Abstract The adsorption of Cd and Zn on a standard montmorillonite (SAZ-1) in the presence of the cationic pesticide chlordimeform, both in solution (simultaneous adsorption) and when the pesticide is previously adsorbed on the clay (successive adsorption) has been studied. The adsorption of Zn decreases when the chlo…
Evidence from a variety of space experiments confirms that gravity does, in some cases, have a significant effect on the crystallization of macromolecules. This has been demonstrated by numerous investigators employing a wide range of instruments and proteins. In the absence of gravity, convective transport of solute…
Abstract The structure of a highly disordered synthetic birnessite was studied by comparing powder X-ray diffraction (XRD) data with calculated patterns generated by BIRNDIF and WILDFIRE© in an attempt to describe the nature of disorder and to estimate the size of the coherent diffracting domains. The material has a t…
Deuterium NMR relaxation and intensity measurements of the 2H-labeled H2O/dimyristoyl phosphatidylcholine bilayer were performed to understand the molecular origin of the freezing event of phospholipid headgroup and the structure and dynamics of unfrozen water molecules in the interbilayer space at subzero temperature…
2 mol% Y 2 O 3 ‐ZrO 2 polycrystals were annealed in water and under vacuum to highlight the effect of the presence of H 2 O on the low‐temperature degradation transformation. The specimen surfaces with monoclinic phases transformed during annealing in the different environments were analyzed by X‐ray photoelectron spe…
Mixtures of the polyaniline (emeraldine base) and phosphorylated calix[4]resorcinolarene derivative (CA) are proposed to prepare LB films for conductometric gas sensors. They are quite stable at the air - water interface and give LB films of high quality. The average thickness of the mixed monolayers is found to be 1.…
Modern diatom samples were collected from 43 sites across the Strømness Bay area of South Georgia. From 115 taxa belonging to 22 six diatom assemblages were distinguished. A CCA-analysis indicated that the assemblages are linked to pH and conductivity ranges, and habitat structure. The Eunotia paludosa var. paludosa -…
Oxide Dispersion Strengthened (ODs) ferritic steel is the promising candidate alloy for long-life core materials of fast reactor. A series of experiments, such as tensile tests, creep rupture tests, texture measurements and microstructure observations, are performed for the fabricated sheets of ODs ferritic steel with…
We review recent NMR studies of the layered organic superconductors of the (BEDT)2X family. First the normal state properties discussed. The central issue is the importance of the interplay between antiferromagnetism and superconductivity in these materials demonstrated by the observation of a pseudogap developing pri…
The United States has extensive coal resources; thus, it is important to consider coal as a fuel for electric power production. This work presents a theoretical study of a novel high-efficiency coal-fired power plant. In the proposed combined cycle power plant, the Conoco coal gasification process is linked with solid…
Ennobled open-circuit potential (Ecorr) for type 316L stainless steel (SS [UNS S31603]) exposed to fresh river water was investigated using microelectrodes to measure dissolved oxygen (DO), hydrogen peroxide (H2O2), and local Ecorr within biofouling deposits. Galvanostatic techniques were used to measure capacitance (…
Recovery of proteins and fats from dairy wastewater has two advantages: the recovery process results in a pretreatment of wastewater prior to discharge to municipal sewers; and the recovered sludge can be used as a food additive. Carboxy Methyl Cellulose (CMC) is commonly used for the treatment of dairy wastewater aft…
The sustentacular cells of the carotid body and the adrenal medulla of guinea pigs were studied by light and electron microscopic immunohistochemistry and compared with the Schwann or satellite cells of the peripheral nervous system. In the peripheral nervous system, neurons were immunoreactive for protein gene produc…
The switching of the polarization in tetragonal ferroelectric ceramics can be achieved by the generation of one new 90° domain wall at the boundary of every grain and a transit of it through the grain driven by the electric field. This transient domain wall is perpendicular to the regular 90° domain walls. In any doma…
A photothermal detector consisting of a relief grating on the surface of an elastomer was fabricated and characterized. The detector has a sensitivity of the order of microwatts per square millimeter and has rise and fall times of the order of tens of seconds. Numerical and analytical modeling account for the behavior…
Other| December 01, 1996 The coordination numbers of Na and K atoms in low albite and microcline as determined from a procrystal electron-density distribution Robert T. Downs; Robert T. Downs Carnegie Institution of Washington, Geophysical Laboratory, Washington, DC, United States Search for other works by this author…
Abstract Soluble poly(2,5‐dialkoxy‐1,4‐phenylenevinylene) has been prepared via Stille coupling reaction between 2,5‐dialkoxy‐1,4‐diiodobenzene and E ‐1,2‐bis(tributylstannyl)‐ethene in the presence of palladium complexes. Characterization of this material by means of 1 H and 13 C nuclear magnetic resonance (NMR), ult…