Eine Dienstgüte unterstützende Webservice-Architektur für flexible Geschäftsprozesse

Web services as a technology to enable distributed business processes gain in importance. However, the support of Quality of Service (QoS) is crucial in this context. Thus, we present an integrated web service architecture with comprehensive QoS support. The architecture we introduce in this paper supports the assessment of web services to assure that only web services will be used in critical business processes that satisfy the requirements defined by the user. The selection and execution of a certain web service depends on its QoS-properties that must be guaranteed in Service Level Agreements (SLAs). The compliance with SLAs is monitored by the system as well. Furthermore we introduce a prototypical implementation of our web service architecture.     

Model-based automation of the design of user interfaces to digitalcontrol systems

Digital control systems, like those controlling the functions of buildings or industrial processes, pose a number of special problems for good user interface design. The general problems of providing usability, common to all systems, include difficulty in accessing and applying principles of good design. In addition, digital control systems can have multiple users, with multiple roles, and each installation has different configurations of systems, controls, and user interface devices. Providing interactions for the users of building control systems is often achieved by manually implementing each required display. This is an expensive solution, which often produces less than optimal results. We address these problems through the automation of user interface design. Our solution, called DIGBE (dynamic interface generation for building environments), separates the domain knowledge, interaction design, and presentation heuristics into multiple collaborating models. Each model contains knowledge about a particular aspect of interface design, and uses this knowledge to dynamically create each user interface that is needed to support the users of a control system. DIGBE demonstrates that it is possible to automatically and dynamically create consistent and individualized user interfaces from model-based design knowledge     

A Preliminary Study of the Toxicological Properties of Selected Polymer–Ferrocene Conjugates

Prompted by early observations of the cytotoxic and antineoplastic properties of certain ferrocene and ferricenium derivatives, efforts in this laboratory were focused on the synthesis of carrier-bound ferrocene compounds. Subsequent cell culture tests carried out with selected conjugates obtained in that program showed these polymers to be highly active antiproliferative agents. In the present project toxicological work has been performed in vivo on several ferrocene conjugates in an effort to assess their toxic effects in experimental animals (CD-1 mice). The conjugates, all based on an ,-DL-polyaspartamide backbone structure, comprise the ferrocene drug model as a terminal on short side chains containing biofissionable amide or ester links for intracellular drug release. The polymers, dissolved in phosphate-buffered saline, have been injected in predetermined concentrations into the vein of the mice, and the maximum tolerated dose (MTD) levels have been determined, the latter referring to the highest dose levels administered that would allow long-term survival of the test animals. For the five conjugates tested, MTD levels range from about 3 to 30 mg Fe/kg or 0.05–0.66 mmol Fe/kg. Compared on a molar metal-to-metal basis with similarly structured platinum conjugates tested previously (MTD, 0.14–2.66 mmol Pt/kg), these values are indicative of comparatively high toxicity of the ferrocene polymers. Some implications of these findings are discussed.     

Rate limitations of unitary event analysis

Unitary event analysis is a new method for detecting episodes of synchronized neural activity (Riehle, Grün, Diesmann, & Aertsen, 1997). It detects time intervals that contain coincident firing at higher rates than would be expected if the neurons fired as independent inhomogeneous Poisson processes; all coincidences in such intervals are called unitary events (UEs). Changes in the frequency of UEs that are correlated with behavioral states may indicate synchronization of neural firing that mediates or represents the behavioral state. We show that UE analysis is subject to severe limitations due to the underlying discrete statistics of the number of coincident events. These limitations are particularly stringent for low (0-10 spikes/s) firing rates. Under these conditions, the frequency of UEs is a random variable with a large variation relative to its mean. The relative variation decreases with increasing firing rate, and we compute the lowest firing rate, at which the 95% confidence interval around the mean frequency of UEs excludes zero. This random variation in UE frequency makes interpretation of changes in UEs problematic for neurons with low firing rates. As a typical example, when analyzing 150 trials of an experiment using an averaging window 100 ms wide and a 5 ms coincidence window, firing rates should be greater than 7 spikes per second.     

Auditory lateralization in monozygotic twins

In an attempt to investigate whether auditory lateralization has a heritable component, 20 monozygotic (MZ) twin pairs were examined with four different dichotic listening tests known to produce reliable right-ear advantages (REAs) in right-handers. Ten twin pairs were concordantly right-handed (MZ-RR), and ten twin pairs were discordant for handedness (MZ-RL). Intraclass correlations for MZ twin pairs were weak or nonexistent for ear advantage, but relatively strong for overall correct scores and mean reaction times, measures unrelated to laterality scores. These results support the hypothesis that auditory lateralization, as measured with dichotic tests, is nongenetic in origin. A comparison of MZ twins and right-handed siblings (n = 20) showed that right-handed siblings exhibited strong REAs, whereas left-handed siblings (n = 20) and MZ twins showed weak or absent REAs, indicating that twins may be atypically lateralized with respect to auditory lateralization.     

De nouveaux stannures ternaires de rhodium et d'elements des terres rares : TR2Rh3Sn5 OU TR = Y,Gd, Tb,Dy, Ho. structure cristalline et proprietes electriques et magnetiques de Y2Rh3Sn5

New ternary stannides are reported : RE₂Rh₃Sn₅ (RE = Y, Gd, Tb, Dy, Ho). Y₂Rh₃Sn₅ has been studied by single - crystal X-ray diffraction analysis. Its structure is of a new type with space group Cmc2₁ and Z = 4 : a = 4,387(2), b = 26,212(4), $\text{c}\text{= 7,1550(8)}\text{A}\text{?}$, D_x = 8,71 Mgm^?3, μ(AgK_α) = 17 mm^?1, F(000) = 1851, R = 0,045 for 478 independant reflexions (R_w = 0,046). This structure is characterized by a tridimensionnal lattice of RhSn covalent bonds with two very different sites for yttrium. Y₂Rh₃Sn₅ is diamagnetic and semimetallic according to its electrical properties.     

Äquivalente Wirkung der Legierungselemente auf die konzentrations- und temperaturabhängige Wasserstofflöslichkeit in eisenreichen Drei- und Mehrstoffschmelzen

Darstellung der Schrifttumsergebnisse zur Konzentrations- und Temperaturabhängigkeit der Wasserstofflöslichkeit in eisenreichen Dreistoffschmelzen. Mathematische Beschreibung der konzentrations- und temperaturabhängigen spezifischen Aktivitätskoeffizienten . Äquivalente Wirkung der Legierungselemente X_i auf den log – Verlauf und auf die partiellen energetischen Größen. Auswertung von Mehrstoffschmelzen Fe–H–X₁–X₂–X_n nach dem Äquivalenzverfahren.     

Äquivalente Wirkung der Legierungselemente auf die konzentrations- und temperaturabhängige Stickstofflöslichkeit in eisenreichen Drei- und Mehrstoffschmelzen

Mathematische Beschreibung der Konzentrations- und Temperaturabhängigkeit des spezifischen Aktivitätskoeffizienten . Äquivalente Wirkung der Legierungselemente auf diese Konzentrations- und Temperaturabhängigkeit. Thermodynamische Ermittlung der partiellen energetischen Größen des Stickstoffs aus dieser Abhängigkeit. Äquivalente Wirkung der Legierungselemente auf diese Größen. Darstellung des Äquivalenzverfahrens zur qualitativen Beschreibung der äquivalenten Wirkung von Legierungselementen in Mehrstoffschmelzen. Auswertung eigener Versuchsergebnisse und entsprechender Befunde des Schrifttums mit dem Äquivalenzverfahren.     

Die Beeinflussung der Kohlenstoff- und Sauerstoffaktivität im flüssigen Eisen durch Nickel und Silizium sowie durch Chrom und Silizium

Untersuchung der gemeinsamen Einflüsse von Nickel und Silizium sowie Chrom und Silizium auf die chemischen Aktivitäten von Kohlenstoff und Sauerstoff im flüssigen Eisen bei 1600°C unter Kohlenmonoxid-Kohlendioxid-Atmosfhäre. Zeichnerische Darstellung der Versuchsergebnisse. Vergleich mit Wirkungsparametern der Randsysteme.