Character of atomic short-range order in the V–Rh system

A study of atomic short-range order in a V-7 at. % Rh alloy was made, using the method of diffuse x-ray scattering and the pseudopotential method. Fluorescent radiation was excluded by using aluminum weakening foils and deducting the fraction of scattered radiation of pure vanadium. In the V-7 at. % Rh alloy, the existence was established of atomic short-range order in which neighboring atoms were primarily of opposite types.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 85–88, April, 1978.     

Recognition by spectrum for finite simple groups of Lie type

The goal of this article is to survey new results on the recognition problem. We focus our attention on the methods recently developed in this area. In each section, we formulate related open problems. In the last two sections, we review arithmetical characterization of spectra of finite simple groups and conclude with a list of groups for which the recognition problem was solved within the last three years.      

Atmospheric deposition of trace elements in Greece using moss Hypnum cupressiforme Hedw. as biomonitors

Journal of Radioanalytical and Nuclear Chemistry - Mosses have been used for monitoring trace elements airborne pollution due to their ability to accumulate elements directly from wet and dry...     

Simple, one-step synthesis of gold nanowires in aqueous solution

A simple procedure to synthesize gold nanowires based on the reduction of hydrogen tetrachloroaurate by 2-mercaptosuccinic acid in aqueous solution is presented. This procedure requires no additional capping or reduction agent and produces wires with an apparent curly morphology several micrometers in length with diameters as thin as 15 nm. Some of the wires produced end in a ribbonlike structure, finally terminated by a flat triangular prism. Investigations by scanning electron microscopy, transmission electron microscopy (bright and dark field), scanning transmission electron microscopy, and atomic force microscopy as well as conductivity measurements indicate fully connected, polycrystalline gold objects.     

Salt softening of polyelectrolyte multilayer microcapsules

By using a combination of atomic force and confocal microscopy, we explore the effect of 1:1 electrolyte (NaCl) on the stiffness of polyelectrolyte microcapsules. We study the "hollow" and "filled" (with polystyrene sulfonate) capsules. In both cases the shells are composed of layers of alternating polystyrene sulfonate (PSS) and polyallylamine hydrochloride (PAH). The stiffness of both "hollow" and "filled" capsules was found to be largest in water. It decreases with salt concentration up to approximately 3 mol/L and gets quasi-constant in more concentrated solutions. The "filled" capsules are always stiffer than "hollow." The observed softening correlates with the salt-induced changes in morphology of the multilayer shells detected with the scanning electron microscopy. It is likely that at concentrations below approximately 3 mol/L the multilayer shell is in a "tethered" state, so that the increase in salt concentration leads to a decrease in number of ionic cross-links and, as a result, in the stiffness. In contrast, above the critical concentration of approximately 3 mol/L multilayer shells might be in a new, "melted," state. Here the multilayer structure is still retained, but sufficient amount of ionic cross-links is broken, so that further increase in salt concentration does not change the capsule mechanics. These ideas are consistent with a moderate swelling of multilayers at concentrations below approximately 3 mol/L and significant decrease in their thickness in more concentrated solutions measured with surface plasmon spectroscopy.     

Einfluß der Füllung auf das extraktionschromatographische Verhalten Seltener Erden im System Di-(2-äthylhexyl)-phosphorsäure-Chromosorb-Salzsäure

The effect of saturation of the support with extractant on the height equivalent to a theoretical plate and capacity was studied from 0.25 to 1 g Di-(2-ethylhexyl)phosphoric acid per gram Chromosorb. The results were obtained in the case of high loading with Rare Earths in the column.     

Poröse Struktur der Polyarylate

Ohne Zusammenfassung     

Über das extraktions-chromatographische Verhalten des Neodyms bei höherer Beladung

The effect of HCl concentration in the mobile phase on the extraction chromatographic behavior of Nd with high column loading was investigated. Significant differences in Nd behavior at low and high HCl concentration were established.