Covariant and consistent anomalies in even-dimensional chiral gauge theories

This paper is devoted to various aspects of anomalies in even-dimensional chiral gauge theories. The difference between the covariant and consistent anomalies is carefully explained in terms of their different origins. The consistent current is defined in terms of a gauge-variant effectve action constructed from the covariant current. An alternative scheme is set up where the covariant anomaly is unaltered but the consistent anomaly vanishes because the effective actions is gauge-invariant. A discussion of theories with vector and axial currents separately gauged is included: here, apart from the covariant anomalies, two different ways of constructing gauge-variant effective actions are possible, giving rise to different structures of the consistent anomalies.     

Quantization of gauge theories with global anomalies

Global anomalies, which obstruct the quantization of certain gauge theories in the temporal gauge, get bypassed in canonical quantization.     

K-shell ionisation cross-sections of Cu,Ge, Mo,Ag and Sn by protons of energy 0.3 to 1.8 MeV

K-shell ionisation cross secions of Cu, Ge, Mo, Ag and Sn in proton impact have been measured systematically in the energy range 0.3 to 1.8 MeV. Thin targets have been used in transmission geometry. Data are compared with the predictions of the PWBA and the PWBA modified to include corrections due to Coulomb retardation of the projectile, increased binding of the target electron during collision and the relativistic nature of theK-shell electrons. The intensity ratiosK _α /K _β have also been obtained as a function of proton energy for all the five elements.     

Carbon-13 spectral studies of some chalcones and flavanones

Carbon-13 signal assignments of 2′,4′-dihydroxychalcone, flemichapparin, pashanone, isodidymocarpin, pedicellin, pedicinin, methylpedicinin, didymocarpin-A and the corresponding quinoflavanone dehydrodidymocarpin-A are reported.     

Nitrosyl Rhenium Complexes: Thiocyanato Derivatives

Fusion of K₂[Re(NO)Cl₅] with KSCN produces the ion [Re(NO)(SCN)₅]^2? which has been isolated as free acid and K⁺, Na⁺, NMe₄⁺, Pb²⁺, Hg²⁺, phen H⁺ and dipyH⁺ salts. A salt of composition Hg₂[Re(NO)(SCN)₇] has also been prepared. The species [Re(NO)Cl(SCN)₄]^2? has been obtained from the reaction of H₂[Re(NO)(SCN)₅] with HCl in aqueous medium and its NMe₄⁺ salt has been isolated. Hydrated Re(NO)Cl₃ reacts with KSCN in aqueous medium to produce the ion [Re(NO)Cl₂(SCN)₃]^2? which has been isolated as its phenH⁺ and dipyH⁺ salts. The complexes have been characterized through elemental analyses, spectral (u.v., vis., i.r.) properties, magnetic and conductance data. The structures of all those compounds have been proposed.     

Interaction of bacterial acidic polysaccharide with cationic dyes

The interaction of acidic capsular polysaccharide isolated fromKlebsiella K26 with cationic dyes pinacyanol chloride, acridine orange and phenosafranin has been studied by spectral measurements. The polymer induces metachromasy in pinacyanol chloride dye, indicating a blue shift in the visibly absorption spectrum of the dye from 600 to 500 nm. The stoichiometry of polymer/dye in the metachromatic compound, thermodynamic parameters of interaction, and effects of different cosolvents on the stability of the complex have been studied. Spectrophotometric and spectrofluorometric properties of the interaction between the polymer and all three dyes are presented. The chromotropic property of the polymer has been established.     

A PM3 study of the critical distance factor in the activation/cyclization of selected Neocarzinostatin analogs

Semiempirical MOPAC RHF/PM 3 and BIRADICAL/PM 3 calculations are performed on several selected analogs of the Neocarzinostatin chromophore. The critical distance parameter, heat of formation, and pertinent bond orders are reported for each model compound. Heats of reaction are also reported for the cyclization of several model compounds to their corresponding diradical products. It is suggested that 3.49 ÅR represents an upper bound to the critical distance in the cyclization of compound related to Neocarzinostatin chromophore. © 1994 John Wiley & Sons, Inc.     

Synthesis, spectroscopic, and structural aspects of two trinuclear cyano-bridged heterometallic complexes

Two new cyano-bridged trinuclear heterometallic complexes [Sr₂(Phen)₄(CF₃CO₂)(H₂O)₃Fe(CN)₆]·2H₂O (1) [Ca₂(Phen)₄(CF₃CO₂)(H₂O)Co(CN)₆]·2H₂O (2) (where Phen=1,10-phenanthroline) have been synthesized and their crystal structures have been determined. The structure of complex (1) features a central [Fe(CN)₆]³⁻ unit that links a monocation, [Sr(Phen)₂(OH₂)(OOCCF₃)]⁺ and a dication, [Sr(Phen)₂(OH₂)₂]²⁺ via two trans cyanide bridges. The complex (2) features a central [Co(CN)₆]³⁻ unit that links two monocations of [Ca(Phen)₂(OH₂)(OOCCF₃)]⁺ (the positions of the trifluoro acetate and water molecules are disordered over two positions) via two trans cyanide bridges. Each metal atom is seven coordinated and achieves pentagonal bipyramidal geometry. Two cocrystallized water molecules are present in both the complexes. The presence of an extensive network of hydrogen bonding imparts the overall stability to both the systems.     

Wärmeübertragung durch freie Konvektion an waagerechten,zylindrischen Rohren bei konzentrischer und exzentrischer Anordnung in einem zylindrischen Behälter

Zusammenfassung Die vorliegende Arbeit beschäftigt sich mit experimentellen Untersuchungen zur Wärmeübertragung durch freie Konvektion an waagerechten, zylindrischen Rohren in zylindrischen Behältern. Die Messungen wurden bei einem Durchmesserverh ältnis D_a/D_i=11,4 sowohl bei konzentrischer als auch bei exzentrischer Anordnung von Innen- und Außenzylinder durchgeführt. Als Wärmeübertragungsmedium diente Wasser. Die Ergebnisse bei konzentrischer Anordnung wurden mit folgenden physikalischen Modellen verglichen: a) freie Konvektion um den Einzelzylinder im unendlichen Medium, b) freie Konvektion in zylindrischen Schichten. Der Vergleich mit vorhandenen Korrelationsgleichungen zu beiden Fällen zeigte, daß der Wärmeübergang dem Fall b) zugeordnet werden muß. Dies wurde durch die Ergebnisse bei exzentrischer Anordnung bestätigt. Es zeigte sich, daß die geometrische Anordnung von Innen- und Außenzylinder einen wesentlichen Einfluß auf die Wärmeübertragung und das Strömungsverhalten hat.

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Heat transfer by free convection from a horizontal tube in concentric and eccentric cylindrical annulus

Heat transfer by free convection from a horizontal cylindrical tube in a cylindrical water filled annulus was measured for concentric and eccentric configurations. The ratio of the diameters of the annulus and the tube is 11.4. Comparisons with available correlation equations show that even for concentric configuration, the heat transfer problem can not be analysed as that in an infinite medium. For the eccentric configuration, the location and eccentricity influence strongly the heat transfer.

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Bezeichungen c_p spez. Wärmekapazität bei konstantem Druck - D Durchmesser - g Fallbeschleunigung - Gr Grashofzahl, Gl. (9) - l charakteristische Länge - L Rohrlänge - m Massenstrom - Nu Nusseltzahl, Gl. (2) - Pr Prandtlzahl, Gl. (8) - Wärmestrom - r Radius - Ra Rayleighzahl,Pr·Gr - s Schichtdicke, r_a r_i - T Temperatur - V Volumenstrom - Differenz - Exzentrizität (Verschiebung des Innenzylinders aus der konzentrischen Position) - dynamische Viskosität - v kinematische Viskosität - Wärmeleitfähigkeit - Dichte - Neigungswinkel von der Vertikalen Indizes a Innenwand des äußeren Zylinders - i Außenwand des inneren Zylinders - E Rohreintritt - A Rohraustritt - m mittel - s Wert bezogen auf Schichtdicke - D Wert bezogen auf Durchmesser - kr kritisch - L Wärmeleitung     

Studies on ZnS Nanoparticles Prepared in Aqueous Sodium Dodecylsulphate (SDS) Micellar Medium

ZnS, a large band gap material, is useful in electro-luminescence and optoelectronic devices. We herein report a method for preparation of nanosized ZnS particles in micellar medium of anionic surfactant sodium dodecylsulphate. The optical properties of the prepared ZnS nanoparticles have been studied by absorption and fluorescence methods. Electron microscopic characterization has evidenced triangular particles, an uncommon observation in the synthesis of nanomaterials. PVC membrane containing nano ZnS dispersions has been prepared and its response as Zn²⁺ ion-selective membrane has been reported.__________From Kolloidnyi Zhurnal, Vol. 67, No. 4, 2005, pp. 494–499.Original English Text Copyright © 2005 by Debolina Mitra, Indranil Chakraborty, Satya P. Moulik.The text was submitted by the authors in English.