The use of emanation thermal analysis for the investigation of radioactive waste fixation processes

The process of incorporation of radioactive wastes into a suitable matrix to form a stable product for long term disposal has been studied. The changes, occuring during the thermal treatment with glassy materials, i.e. drying, transformation processes, sintering, melting, etc. have been followed using emanation (radon) thermal analysis. This method was found useful in solving the problems of process development.     

Generalized prolate spheroidal wave functions for offset linear canonical transform in Clifford analysis

Prolate spheroidal wave functions (PSWFs) possess many remarkable properties. They are orthogonal basis of both square integrable space of finite interval and the Paley–Wiener space of bandlimited functions on the real line. No other system of classical orthogonal functions is known to obey this unique property. This raises the question of whether they possess these properties in Clifford analysis. The aim of the article is to answer this question and extend the results to more flexible integral transforms, such as offset linear canonical transform. We also illustrate how to use the generalized Clifford PSWFs (for offset Clifford linear canonical transform) we derive to analyze the energy preservation problems. Clifford PSWFs is new in literature and has some consequences that are now under investigation. Copyright © 2012 John Wiley & Sons, Ltd.     

Some improvements of Ostrowski’s method

In this paper, we present some new variants of Ostrowski’s method with order of convergence eight. For each iteration the new methods require three evaluations of the function and one evaluation of its first derivative and therefore they have the efficiency index equal to 1.682. Numerical tests verifying the theory are also given.     

Prebunched high-harmonic gyrotron

A scheme for harmonic wave generation using a prebunched electron beam has been demonstrated. The prebunched electron beam has been used to further increase the efficiency of the authors' axis-encircling high-harmonic gyrotron. The proof-of-principle experiment was performed at the third harmonic with a TE₃₁₂ mode at 27.7 GHz. The conversion power of 6.7 kW was significantly greater than that used in the nonprebunched experiment. Also, mode competition was effectively suppressed. As expected, the unsaturated output power is proportional to the square of the electron beam current and the start of oscillation current is essentially zero. A linear theory, derived by taking into account the spread of the guiding center and the spread of the axial velocity, gives good agreement with the experimental results     

几种偶氮胂试剂与高碘酸钾的褪色反应用于动力学光度法测定痕量钌

本文发现了Ｒｕ（Ⅲ）对于ＫＩＯ４分别与ＴＢ－偶氮胂、ＴＣ－偶氮胂、ＤＣＳ－偶氮胂之间的褪色反应有显著的催化作用，研究了用此类褪色反应的动力学光度法测定痕量钌的最佳条件。此法灵敏度极高，其检出限可达０．０１μｇ／１０ｍｌ，且线性关系良好，反应在水相中直接进行，已用于贵金属精矿中痕量钌的测定。     

Fluorimetric liquid chromatographic analysis of amantadine in urine and pharmaceutical formulation

A simple and sensitive liquid chromatographic method is described for the analysis of amantadine and memantine. The method is based on the derivatization of amantadine and memantine extracted from alkalified samples with (2-naphthoxy)acetyl chloride at mild conditions. The resulting derivatives were analyzed by isocratic HPLC with a fluorimetric detector (lambdaex, 227 nm; lambdaem, 348 nm). The linear range for the determination of amantadine or memantine spiked in urine (1.0 ml) was 1.0-10.0 nmol with a detection limit of about 0.2 nmol (S/N = 3; injected sample 20 microl). Only amantadine preparations are available on our local market, and application of the method to the analysis of amantadine in formulation and in the urine of a dosed subject was demonstrated and proved feasible. Quantitation of AT in tablets or capsules is capable in the linear range of 2.0-50.0 microM. Toluene was used as the solvent for extracting amantadine or memantine in samples and the resulting toluene extract was directly subjected to subsequent derivatization without solvent replacement leading to a simpler analytical procedure.     

Cyano-bridged 2D Cu(II)-Cr(III) coordination polymers: structural evidence for formation of a polymeric macrocyclic metallic compound

Two unique cyano-bridged 2D coordination polymers have been synthesized and characterized structurally and magnetically. The complexes contain two polyaza Cu(II) units and one novel macromolecular Cu(II) moiety, which have been synthesized via one-pot metal template condensation reactions involving ethylenediamine (en) and formaldehyde. Self-assembly of the polyaza Cu(II) mixture with [Cr(CN)(6)](3)(-) gave rise to two layered complexes. One complex contains unprecedented covalently linked polymeric Cu(II) chains and cyano-bridged Cu(II)(-)Cr(III) coordination chains, which are interwoven to form a novel layer. The other complex shows intriguing encapsulation of [Cr(CN)(6)](3)(-) anions. Intermetallic ferromagnetic coupling is operative within the bridged 2D layer. The magnetic susceptibilities of both complexes were simulated using approximate models.     

A new route to the asymmetric cylindrical macrotricyclic ligands

New asymmeric cylindrical macrotricyclic ligands have been prepared containing two diaza-12-crown-4 units connected by diethyleneoxy or triethyleneoxy and meta- or para-xylylene bridges, 2-4 . These materials were prepared in three steps by first treating 6-tosyl-6-aza-3,9-dioxa-1,11-undecanediyl ditosylate with 3-oxa-1,5-pentanediamine or 3,6-dioxa-1,8-octanediamine to form ditosyl-substituted bis(diaza-12-crown-4)s connected by a diethyleneoxy or triethylencoxy bridge. These latter compounds were detosylated and treated with either para- or meta-α,α'-dibromoxylene to give new asymmetric cylindrical macrotricycles 2-4 . The solid state structure of one of these ligands, 3 , has been determined by X-ray diffraction methods.     

Determination of Iodide as an Organic Derivative by Gas-Chromatography

A simple and specific method is described for the analysis of iodide in trace proportions. The method is based on the reaction of iodide with pentafluorobenzyl 5-dimethylamino-1-naphthalenesulfonate.in a biphasic system. The resulting derivative was determined on a gas chromatograph with a flame-ionization detector. The detection limit was about 8 nmol of iodide in 1.0 mL of aqueous sample (S/N = 2; sample size, 5 μL). Application of the method to the analysis of available iodine in povidone-iodine solution proved feasible.