Reseña de La ciudad de Massimo Cacciari

Tal y como se expone en la introducción, no resulta fácil abordar el último libro de Massimo Cacciari, La ciudad , pues no solamente porque no está exento de la dificultad y profundidad teórica comunes a los otros textos del autor, sino también porque resulta reductivo todo intento de clasificación genérica.

The permanence of the client under uncertain estimations

Marketing has studied the permanence of a client within an enterprise because it is a key element in the study of the value (economic) of the client (CLV). The research that they have developed is based in deterministic or random models, which allowed estimating the permanence of the client, and the CLV. However, when it is not possible to apply these schemes for not having the panel data that this model requires, the period of time of a client with the enterprise is uncertain data. We consider that the value of the current work is to have an alternative way to estimate the period of time with subjective information proper of the theory of uncertainty.

The role of fast atom bombardment mass spectroscopy (FABMS) in cluster characterization

Fast atom bombardment mass spectroscopy has been used to study a large number of cationic phosphine-containing transition-metal-gold clusters, which ranged in mass from 1000 to 4000. Many of these clusters have been previously characterized and were examined in order to test the usefulness of the FABMS technique. Results showed that FABMS is excellent in giving the correct molecular formula and when combined with NMR, IR, and microanalysis gave a reliable characterization for cationic clusters¹. Recently FABMS has become one of the techniques employed as routine in cluster characterization2,3 and also is an effective tool for the structure analysis of large biomolecules4. Some results in the present work reinforce the importance of these data in the characterization of clusters in the absence of crystals with quality for X-ray analysis.

Construção de campo de força empírico para estudo de complexos de Fe(III) com interesse bioinorgânico

In this work we present a new parametrization in molecular mechanics for studying iron complexes. This force field was implemented in the FORCES 2000 program, developed in our group for studying in coordination compounds of interest in bioinorganic chemistry. Mononuclear and dinuclear iron complexes were studied using this program with good success.

Caracterización estructural de capas epitaxiadas de InGaAs/InAlAs crecidas sobre substratos (111) de InP

Se ha analizado por microscopía electrónica en transmisión (TEM) la estructura de transistores HEMT basados en un pozo cuántico tensionado de InGaAs/InAlAs crecido sobre un sustrato {111} de InP. Se han observado dislocaciones filiformes y defectos planares que cruzan la capa superior hacia la superficie, así como maclas paralelas a la interficie y grandes complejos defectivos en forma de V que se nuclean unos pocos nanometres por encima de la interficie entre el pozo cuántico y la capa superior que lo confina. La estructura de los defectos es muy diferente de la observada en heteroestructuras similares crecidas sobre sustratos {100}, hecho que sugiere que hay que tener en cuenta consideraciones sobre el proceso mismo de nucleación de los defectos junto con las convencionales relacionadas con el desajuste de redes.

DUODES: Paraules clau d'història de les dones a Catalunya, segles IX-XVIII: una proposta de tesaurus

Sobre una proposta de tesaurus amb les paraules clau d'història de les dones de Catalunya dels segles IX a XVIII, realitzat per les dones de les seccions d'Història Medieval i Moderna del Centre d'lnvestigació Històrica de la Dona de la Universitat de Barcelona (DUODA)

DUODES: Paraules clau d'història de les dones a Catalunya, segles IX-XVIII: una proposta de tesaurus : configuración general

Sobre la configuració general d'una proposta de tesaurus amb les paraules clau d'història de les dones de Catalunya dels segles IX a XVIII, realitzat per les dones de les seccions d'Història Medieval i Moderna del Centre d'lnvestigació Històrica de la Dona de la Universitat de Barcelona (DUODA)

Uma visão da química bioinorgânica medicinal

Metals play a vital role in human and plant physiology and important research is directed towards exploring the interrelated mechanisms that govern their interactions with biomolecules. Bioinorganic medicinal chemistry studies the functions, processing, storage and applications of metal ions and their complexes in biological systems. This paper presents a brief discussion about on interactions of metals with biomolecules that determine their intracellular accumulation, where metal ions may fulfill essential functions in cellular metabolism or, in certain cases, exert toxic effects towards cells.

Readout electronics for low dark count pixel detectors based on geiger mode avalanche photodiodes fabricated in conventional CMOS technologies for future linear colliders

The high sensitivity and excellent timing accuracy of Geiger mode avalanche photodiodes makes them ideal sensors as pixel detectors for particle tracking in high energy physics experiments to be performed in future linear colliders. Nevertheless, it is well known that these sensors suffer from dark counts and afterpulsing noise, which induce false hits (indistinguishable from event detection) as well as an increase of the necessary area of the readout system. In this work, we present a comparison between APDs fabricated in a high voltage 0.35 µm and a high integration 0.13 µm commercially available CMOS technologies that has been performed to determine which of them best fits the particle collider requirements. In addition, a readout circuit that allows low noise operation is introduced. Experimental characterization of the proposed pixel is also presented in this work.

Low dark count geiger mode avalanche photodiodes fabricated in conventional CMOS technologies

Avalanche photodiodes operated in the Geiger mode present very high intrinsic gain and fast time response, which make the sensor an ideal option for those applications in which detectors with high sensitivity and velocity are required. Moreover, they are compatible with conventional CMOS technologies, allowing sensor and front-end electronics integration within the pixel cell. Despite these excellent qualities, the photodiode suffers from high intrinsic noise, which degrades the performance of the detector and increases the memory area to store the total amount of information generated. In this work, a new front-end circuit that allows low reverse bias overvoltage sensor operation to reduce the noise in Geiger mode avalanche photodiode pixel detectors is presented. The proposed front-end circuit also enables to operate the sensor in the gated acquisition mode to further reduce the noise. Experimental characterization of the fabricated pixel with the conventional HV-AMS 0.35µm technology is also presented in this article.

Observationes circa linguam russicam nonnullae

Dedicatio: Anna Maria Geitlin s. Aspholm [ruots. pr.] - Errata.

Om näringarnas samband och medvärkan på hvarandra

Invocatio: M.G.H.

De moralitate imputationis actionum hominis vitalium

Invocatio: I.N.D.O.M.

Observationes quaedam circa methodum, in juventute instituenda a veteribus receptam

Invocatio: D.J.

Öfversigt af ryska språkets bildning

Dedicatio: Anders Ehrström, Anna Maria Reinius.