2MASSJ22560844+5954299: the newly discovered cataclysmic star with the deepest eclipse

Context: The SW Sex stars are assumed to represent a distinguished stage in CV evolution, making it especially important to study them. Aims: We discovered a new cataclysmic star and carried out prolonged and precise photometric observations, as well as medium-resolution spectral observations. Modelling these data allowed us to determine the psysical parameters and to establish its peculiarities. Results: The newly discovered vataclysmic variable 2MASSJ22560844+5954299 shows the deepest eclipse amongst the known nova-like stars. It was reproduced by totally covering a very luminous accretion disk by a red secondary component. The temperature distribution of the disk is flatter than that of steady-state disk. The target is unusual with the combination of a low mass ratio q~1.0 (considerably below the limit q=1.2 of stable mass transfer of CVs) and an M-star secondary. The intensity of the observed three emission lines, H_alpha, He 5875, and He 6678, sharply increases around phase 0.0, accompanied by a Doppler jump to the shorter wavelength. The absence of eclipses of the emission lines and their single-peaked profiles means that they originate mainly in a vertically extended hot-spot halo. The emission H_alpha line reveals S-wave wavelength shifts with semi-amplitude of around 210 km/s and phase lag of 0.03. Conclusions: The non-steady-state emission of the luminous accretion disk of 2MASSJ22560844+5954299 was attributed to the low viscosity of the disk matter caused by its unusually high temperature. The star shows all spectral properties of an SW Sex variable apart from the 0.5 central absorption.Comment: Accepted for publication in Astronomy & Astrophysics. 12 pages, 11 figures, 6 table

Herstellung von Pellets durch Extrusion und Spheronisation : systematische Rezepturentwicklung als Grundlage für ein wissensbasiertes System

Die vorliegende Arbeit beschäftigt sich mit der Herstellung von Pellets mittels Extrusion und Spheronisation. Variablen der Rezepturzusammensetzung und der Verfahrensbedingungen sollten im Hinblick auf ihren Einfluss auf charakteristische Kenngrößen der hergestellten Pellets untersucht werden. Ziel dieser Untersuchungen war es, Möglichkeiten der Prognose für bestimmte Pelleteigenschaften zu entwickeln. Es konnte gezeigt werden, dass der Nutzanteil einer Pelletcharge vom zugesetzten Wasseranteil abhängt. Für binäre Mischungen aus einem Arzneistoff und dem Extrudierhilfsmittel mikrokristalline Cellulose konnten lineare Abhängigkeiten für den optimalen Wasseranteil festgestellt werden. Über substanzspezifische Konstanten für den Wasseranteil konnte eine Möglichkeit zur Berechnung der benötigten Wassermenge entwickelt werden. Auch der Pelletdurchmesser ist von der Rezepturzusammensetzung abhängig. Als Hauptkomponente wurden Avicel- und Wasseranteil identifiziert. Drei mathematische Modelle zur Prognose des mittleren Pelletdurchmessers wurden entwickelt und verglichen. Das beste Modell basiert auf der experimentellen Bestimmung einiger Stoffkonstanten. Die Rundheit der Pellets wird ebenfalls durch den Wasseranteil beeinflusst und lag bei optimalem Wasseranteil (der über den Nutzanteil definiert wird) immer im geforderten Bereich. Für die Pellet-Schüttdichte konnten keine eindeutigen Abhängigkeiten gefunden werden, bei der Pellet-Bruchfestigkeit erschwerten stark streuende Messergebnisse die Auswertung; jedoch konnte eine Prognosegleichung für die Bruchfestigkeit aufgestellt werden, die im Rahmen der Messgenauigkeit eine gute Berechnung ermöglicht. Es zeigte sich, dass die Freigabe aus diesen Matrixarzneiformen maßgeblich durch Eigenschaften des Arzneistoffs bestimmt wird. Anhand der verwendeten Substanzen wurden drei Gruppen definiert, die sich im Hinblick auf die Freisetzung unterschiedlich verhalten. Beim Vergleich der Verfahren wurde deutlich, dass zwar mit allen untersuchten Gerätekombinationen Pellets hergestellt werden können, die Anforderungen an die Rezepturzusammensetzung und die Eigenschaften der erhaltenen Pellets jedoch unterschiedlich sind. Diese Unterschiede konnten über verfahrensspezifische Korrekturfaktoren ausgeglichen werden. Die Spheronisation wurde getrennt vom Gesamtverfahren betrachtet. Hier ging es vornehmlich um die Festlegung optimaler Verfahrensparameter. Ebenso wurden zwei Trocknungsverfahren einander gegenübergestellt. Dabei zeigte sich, dass die Hordentrocknung und die Wirbelschichttrocknung in den untersuchten Fällen vergleichbare Ergebnisse bringen und daher austauschbar sind

Zusammensetzung der Biozönose der Methanbildung unter Anwendung molekularbiologischer Methoden: Auswahl und Immobilisierung eines prozesstragenden Organismus auf einem Biosensor mit dem Ziel der Überwachung der Prozessstabilität kommerzieller Biogasanlagen

Der Biogasbildungsprozess wird mikrobiologisch von fünf Bakterien und vier Archaeen dominiert. Diese Organismen zeigen mit speziell entwickelten fluoreszierenden Sonden mikroskopisch über Fluoreszenz-in-situ-Hybridisierung (FISH) und über eine quantitative real time PCR in Langzeitversuchen und in verschiedenen Prozessen unterschiedliche Abundanz. In sechs identischen Biogaslaborfermentern konnte gezeigt werden, dass das Intermediärprodukt Butyrat bei punktuellen und semikontinuierlichen Zugaben eine erhöhte Gasausbeute, jedoch keine Veränderung bezüglich der Häufigkeit der Organismen bewirkt.The biogas process is dominated by five bacteria and four Archaea. This species show, detected by Fluorescence-in-situ-hybridization (FISH) and quantification real time PCR, variations in the abundance over time and different plants. In six identically anaerobic biogas digesters the influence of punctual and semi-continuous additions of the intermediate products acetate and butyrate results in rising gas volume and constant abundance of the microorganisms

Nonlinear control of high purity distillation columns

Two simple models of distillation columns are studied to investigate their suitability for the practical use with exact I/O-linearization. An extension of exact I/O-linearization, the asymptotically exact I/O-linearization is applied to the control of a high purity distillation column, using one of these models to derive the static state feedback law. Simulation studies demonstrate the advantage of asymptotically exact I/O-linearization versus classical exact I/O-linearization techniques. Experimental results show the excellent performance of asymptotically exact I/O-linearization using a simple distillation model

Verifying the ecological model of peer aggression on Croatian students

Using the ecological approach, the goal of this study was to determine the predictors of physical and verbal peer aggressive behavior. The participants were 880 school students from the fifth to eighth grade (48% boys and 52% girls) and the same number of parents (19% fathers and 61% mothers) as well as 107 teachers. The main analysis was performed using multivariate–multilevel modeling. The following significant predictors of physical peer aggression were obtained: Boys, a greater degree of impulsivity, more parental punishment, poorer school success, more time spent with the media, and the perception of great neighborhood dangerousness. For verbal peer aggression, the significant predictors were: A greater degree of impulsivity, lower level of affective empathy, more parental punishment, lack of parental supervision, lesser peer acceptance, large differences in family income, more time spent with the media, and the perception of great neighborhood dangerousness. A moderating effect of neighborhood dangerousness and parental supervision was found. The results were interpreted within Bronfenbrenner’s ecological model

Beyond the 'Grid-Lock' in Electricity Interconnectors: The Case of Germany and Poland

The common European electricity market requires both market integration and transmission grid expansion, including trans-border interconnectors. Although the benefits of increased interconnectivity are widely acknowledged, expansion of interconnectors is often very slow. This paper gathers insights on the reasons behind this grid-lock drawing on the study of the German-Polish border. Although two interconnectors already exist, the trade is blocked by unplanned electricity loop flows. A third interconnector has been discussed for years, but saw little progress in spite of declarations of support on both sides. Drawing on the existing literature on the topic of grid expansion we identify four hypotheses for the grid-lock: inadequate financing; diverging interests; governance and administration problems; and different actors' motivations, trust and security perceptions. We evaluate them using the empirical material gathered through document analysis and stakeholder interviews conducted in Germany and Poland. None of the hypotheses on its own can explain the gridlock. However, while financing has not been a major obstacle, divergent interests had an impact on the project delay, administrative and governance problems are a great hindrance on the technical level, while motivations influence interstate political relations and policy shaping. EU support and closer bilateral cooperation provide opportunities to address these challenges

Toward the Globalization of Psychology. The Congresses Around the World (1974–1998)

This book introduces the history of psychology during the past hundred years, mainly through conferences/congresses. In fact, for psychologists, the creation of international conferences was seen as a useful step in exchanging and promoting psychology as a science. Since the first international congress in 1889, psychologists from all over the world have met regularly at congresses with more and more attendees and many interesting topics to discuss.2019-2

Complete Genome Sequence of Mycoplasma suis and Insights into Its Biology and Adaption to an Erythrocyte Niche

Mycoplasma suis, the causative agent of porcine infectious anemia, has never been cultured in vitro and mechanisms by which it causes disease are poorly understood. Thus, the objective herein was to use whole genome sequencing and analysis of M. suis to define pathogenicity mechanisms and biochemical pathways. M. suis was harvested from the blood of an experimentally infected pig. Following DNA extraction and construction of a paired end library, whole-genome sequencing was performed using GS-FLX (454) and Titanium chemistry. Reads on paired-end constructs were assembled using GS De Novo Assembler and gaps closed by primer walking; assembly was validated by PFGE. Glimmer and Manatee Annotation Engine were used to predict and annotate protein-coding sequences (CDS). The M. suis genome consists of a single, 742,431 bp chromosome with low G+C content of 31.1%. A total of 844 CDS, 3 single copies, unlinked rRNA genes and 32 tRNAs were identified. Gene homologies and GC skew graph show that M. suis has a typical Mollicutes oriC. The predicted metabolic pathway is concise, showing evidence of adaptation to blood environment. M. suis is a glycolytic species, obtaining energy through sugars fermentation and ATP-synthase. The pentose-phosphate pathway, metabolism of cofactors and vitamins, pyruvate dehydrogenase and NAD+ kinase are missing. Thus, ribose, NADH, NADPH and coenzyme A are possibly essential for its growth. M. suis can generate purines from hypoxanthine, which is secreted by RBCs, and cytidine nucleotides from uracil. Toxins orthologs were not identified. We suggest that M. suis may cause disease by scavenging and competing for host' nutrients, leading to decreased life-span of RBCs. In summary, genome analysis shows that M. suis is dependent on host cell metabolism and this characteristic is likely to be linked to its pathogenicity. The prediction of essential nutrients will aid the development of in vitro cultivation systems