Radiation reaction studies in an all-optical set-up: experimental limitations

The recent development of ultra-high intensity laser facilities is finally opening up the possibility of studying high-field quantum electrodynamics in the laboratory. Arguably, one of the central phenomena in this area is that of quantum radiation reaction experienced by an ultra-relativistic electron beam as it propagates through the tight focus of a laser beam. In this paper, we discuss the major experimental challenges that are to be faced in order to extract meaningful and quantitative information from this class of experiments using existing and near-term laser facilities.     

Aufarbeitung von Fermentationsprodukten

Recovery of fermentation products . Microbiological production of chemical products involves culturing of suitable microorganisms (bacteria, fungi, yeasts). The recovery or work-up procedure employed to isolate cellular material or active components (such as secondary metabolites) depends upon whether the substances are present in the aqueous phase, in the cells, or in both. Many products are sensitive (thermolabile, pH changes) and therefore require mild recovery conditions. This article considers, from an industrial viewpoint, the principal physical and chemical recovery methods (and some combinations), special requirements and operation modes of equipment, performance and consumption data, an assessment of various recovery methods, as well as development trends, future requirements, and desirable studies. Production of foods, tissue cultures, and methods of a purely preparative nature are not considered.     

The psychoanalytic process and Freud’s concepts of transference and transference neurosis.

The author investigates the concept of psychoanalytic process as it relates to the capability for defining the specificity of psychoanalytic treatments. The concept is traced back to its origin in Freud’s understanding of transference and transference neurosis. The author suggests that this process should be understood as an issue in which via “just-like-interpretations” contents of the patient’s transference enter into consciousness in the guise of a transference neurosis. These newly built substitutive formations are then removed by “just-like-it-was-interpretations” and changed into other substitutive formations. As this process can only be instigated by psychoanalytic measures, it is, therefore, the process itself that defines the specific difference of psychoanalytic treatments. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Objectivation of psychic alterations in patients after hypophysectomy (author's transl)

17 patients who had undergone transfrontal hypophysectomy were compared as regards their performance in the MMPI Saarbrücken and the Rosenzweig-Picture-Frustation Study with an equal number of patients who had undergone comparable head surgery. The results suggest that the psychic alterations revealed in these tests may be regarded as unspecific consequences of the operative method.     

Affect and mimetic behavior]

The relationship between facial expression and experienced affect presents many problems. The two diametrically opposed positions proposing solutions to this problem are exemplified using the conceptions of Mandler u. Izard. The underlying premises of both conceptions still prevail in various forms. The authors reject the concepts according to which facial expression is merely correlated to the affects (see Mandler 1975) as well as the view that facial expression controls the affects (see Izard 1977). The relationship between affect and facial expression is reexamined, subjecting it to a semiotic, essentially semantic analysis similar to the Ogden and Richards' language and meaning approach. This analysis involves a critical discussion of Scherer's attempt of a purely communicational interpretation using Bühler's organon model. In the author's approach, facial expression is seen not simply as a system of signals, but as a system of representative signs which signify the affects and refer to the emotive meaning of things for the subject. The authors develop the thesis that human beings are not born simply with the ability to speak, but also with the abstract possibility of performing facial expressions. This ability develops by way of coordinating patterns of expressions, which are presumably phylogenetically determined, with affects that take on a socially determined individual form, similar to language acquisition during socialisation. The authors discuss the methodological implications arising for studies investigating the affective meaning of facial expressions.     

Congestion and flow control in Signaling System No. 7-impacts ofintelligent networks and new services

Focuses on the transient performance analysis of the congestion and flow control mechanisms in CCITT Signaling System No. 7 (SS7). Special attention is directed to the impacts of the introduction of intelligent services and new applications, e.g., Freephone, credit card services, user-to-user signaling, etc. In particular, the authors show that signaling traffic characteristics like signaling scenarios or signaling message length as well as end-to-end signaling capabilities have a significant influence on the congestion and flow control and, therefore, on the real-time signaling performance. One important result of the performance studies is that if, e.g., intelligent services are introduced, the SS7 congestion and flow control does not work correctly. To solve this problem, some reinvestigations into these mechanisms would be necessary. Therefore, some approaches, e.g., modification of the signaling connection control part (SCCP) congestion control, usage of the SCCP relay function, or a redesign of the message transfer part (MTP) flow control procedures are discussed in order to guarantee the efficacy of the congestion and flow control mechanisms also in the future     

On the intellectual capacity of patients suffering from ulcerative colitis--a comparative study using the HAWIE--(author's transl)

Differing reports in the literature on the intellectual capabilities of patients with unspecific ulcerative colitis caused us to undertake a controlled test-psychological study. 30 patients with ulcerative colitis and 30 "healthy" control persons were tested with the Hamburg-Wechsler-Intelligenztest für Erwachsene (HAWIE). The patients and the controls were matched as regards age, sex, family status, education, professional status and monthly income. A statistical comparison using the Wilcoxon matched-pairs signed-ranks test showed that the two groups did not differ significantly in their intelligence quotients. Our results seem to indicate that the assumption of extraordinary intellectual capabilities of patients with ulcerative colitis is not tenable.     

Computing correct Delaunay triangulations

In recent years the practical computation of Delaunay triangulations, resp. Voronoi diagrams has received a lot of attention in the literature. While the Delaunay triangulation is an important basic tool in geometric optimization algorithms, it is nontrivial to achieve a numerically stable computer implementation. In this technical note we assume that all generating points are grid points of a regularM byM lattice in the plane. Depending onM we derive the necessary word length a binary computer must have for integer representation in order to obtain exact Delaunay triangulations. This analysis is carried out for theL ₁-,L ₂- andL _∞-metric.