The BRST Symmetry of Affine Lie Superalgebras and Non-Critical Strings

The topological field theories associated with affine Lie superalgebras are constructed. Their BRST symmetry is characterised by a Kazama algebra containing spin 1, 2 and 3 operators and closes linearly. Under this symmetry all operators are grouped into BRST doublets. The relation between the models constructed and non-critical string theories is explored.Comment: 26 pages, phyzzx, no figure

Analysis of infrared optical polishing effluents and reduction of COD and TSS levels by ultrafiltration and coagulation/flocculation

Samples of polishing effluent produced during infrared optics manufacture were analyzed. Their particle size, composition, Zeta potential, chemical oxygen demand (COD), total suspended solids (TSS), and settleable solids were determined. Feasibility of treatment methods such as ultrafiltration (UF) and coagulation/flocculation was investigated to reduce both COD and TSS. It was found that effluents consisted of a suspension of micro- and nanoparticles. Effluent particle size distribution reflected the removal rate of the originating polishing process. Their composition was primarily germanium and other polished substrates as well as polishing abrasives. The effluent Zeta potential was highly negative and prevented particle settling. COD of all specimens was very high, which prevented sewage discharge. Laboratory-scale trials using UF showed substantial COD abatement of up to 74.1%. TSS was reduced to zero after UF. Comparable coagulation/flocculation COD abatement was demonstrated for the highest COD sample

Horizons and plane waves: A review

We review the attempts to construct black hole/string solutions in asymptotically plane wave spacetimes. First, we demonstrate that geometries admitting a covariantly constant null Killing vector cannot admit event horizons, which implies that pp-waves can't describe black holes. However, relaxing the symmetry requirements allows us to generate solutions which do possess regular event horizons while retaining the requisite asymptotic properties. In particular, we present two solution generating techniques and use them to construct asymptotically plane wave black string/brane geometries.Comment: 15 pages, harvmac. Review to appear in Modern Physics Letters A v2: added reference

Anatomía comparada del retropié, caracteres derivados del tipo de locomoción

Tras una breve reseña a los primeros hallazgos paleontológicos que nos ayudaron a conocer como se desplazaban nuestro antecesores, y que nos lleva a afirmar que los homínidos practicaban la bipedestación hace 3,5 Ma. Se realiza un análisis comparativo, entre hombre y otros primates, de la embriología y biomecánica de la articulación subastragalina. En estos apartados se compara la ontogenia y la filogenia así como las diferencias que presenta el eje único de Henke entre distintas familias de primates, y las consecuencias de estas diferencias en la marcha y las implicaciones que la bipedestación ha tenido en la evolución de la arcticulación subastragalina. También se analizan los principales tipos de locomoción en primates

A gauge theory of quantum mechanics

An Abelian gerbe is constructed over classical phase space. The 2-cocycles defining the gerbe are given by Feynman path integrals whose integrands contain the exponential of the Poincare-Cartan form. The U(1) gauge group on the gerbe has a natural interpretation as the invariance group of the Schroedinger equation on phase space.Comment:

Paleopatología en la “Cova des Pas”: Los procesos neoplásicos

X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200