Approaching the Ground State of Frustrated A-site Spinels: A Combined Magnetization and Polarized Neutron Scattering Study

We re-investigate the magnetically frustrated, {\it diamond-lattice-antiferromagnet} spinels FeAl$_2$O$_4$ and MnAl$_2$O$_4$ using magnetization measurements and diffuse scattering of polarized neutrons. In FeAl$_2$O$_4$, macroscopic measurements evidence a "cusp" in zero field-cooled susceptibility around 13~K. Dynamic magnetic susceptibility and {\it memory effect} experiments provide results that do not conform with a canonical spin-glass scenario in this material. Through polarized neutron scattering studies, absence of long-range magnetic order down to 4~K is confirmed in FeAl$_2$O$_4$. By modeling the powder averaged differential magnetic neutron scattering cross-section, we estimate that the spin-spin correlations in this compound extend up to the third nearest-neighbour shell. The estimated value of the Land\'{e} $g$ factor points towards orbital contributions from Fe$^{2+}$. This is also supported by a Curie-Weiss analysis of the magnetic susceptibility. MnAl$_2$O$_4$, on the contrary, undergoes a magnetic phase transition into a long-range ordered state below $\approx$ 40~K, which is confirmed by macroscopic measurements and polarized neutron diffraction. However, the polarized neutron studies reveal the existence of prominent spin-fluctuations co-existing with long-range antiferromagnetic order. The magnetic diffuse intensity suggests a similar short range order as in FeAl$_2$O$_4$. Results of the present work supports the importance of spin-spin correlations in understanding magnetic response of frustrated magnets like $A$-site spinels which have predominant short-range spin correlations reminiscent of the "spin liquid" state.Comment: 10 pages, 10 figures, double-column, accepted in Phys. Rev. B, 201

Theory-based Analyses of Interorganisational Standards for Self-organising, Adaptive Value Creation Networks

Today many enterprises find themselves in situations of forming new or integrating into existing value creation networks to strengthen their market position and to provide new innovative customer solutions to its customers. Due to their high complexity, effective and efficient value creation networks rely on self-organising and adaptive structures and processes. Information flows amongst business partners and the coordination of these flows by cooperation activities are major design parameters of such networks. Interorganisational standards (IOS) seek to ease information infrastructure design by providing a referential frame. However, practitioners finding themselves in situations of selecting specific standards and thereby deciding against others, so far lack sufficient theoretical guidance in this selection problem. This research informs the IOS selection problem by condensing insights from the body of knowledge from management cybernetics and coordination theory and identifying first requirements to a method guiding IOS choices

Supporting Creative Group Processes – Groupware for Communication and Coordination

The idea of the creative individualist spawning innovations as a solitude effort is no longer realistic. Huge innovation projects, relying on project teams, have to be permanently conducted by organizations to assure their competitiveness. These projects often take place in distributed teams, making use of groupware to bridge temporal and geographical distances. Research in social psychology on group processes has revealed that group work suffers from several group process losses such as information overload, production blocking, free riding and evaluation apprehension. Moreover, creative group processes have to be coordinated to assure goal orientation and efficiency. In the shade of the Media Synchronicity Theory and Coordination theory we analyze aspects of communication and coordination support of groupware functionality. We conclude that idea generation should be supported by synchronous groupware functionality whilst idea evaluation merits from asynchronous functionality. Moreover both phases do not depend on single outstanding but various groupware functionalities to support coordination

Introduction

Im März 2018 fand am Deutschen Historischen Institut (DHI) in Rom eine Tagung zur Bedeutung der Digital Humanities für die Erschließung und Auswertung der kurialen Quellen statt. Das am genannten Institut angesiedelte Repertorium Germanicum (RG) bereitet das Quellenmaterial des Archivio Segreto Vaticano und weiterer hauptsächlich römischer Archive für die Geschichte der Territorien und Diözesen des Alten Reiches auf, die weit über die Grenzen des heutigen Deutschlands reichen. Die damit verbundene überregionale Dimension des RG ist Anlass für einen Austausch mit verwandten Erschließungsprojekten im europäischen Vergleich, von denen hier sieben Fallstudien von Autor/-innen aus fünf Ländern vorgestellt werden

Body composition and behaviour in adult rats are influenced by maternal diet, maternal age and high-fat feeding

Fetal exposure to maternal undernutrition has lifelong consequences for physiological and metabolic function. Maternal low-protein diet is associated with an age-related phenotype in rats, characterised by a period of resistance to development of obesity in early adulthood, giving way to an obesity-prone, insulin-resistant state in later adulthood. Offspring of rats fed a control (18 % casein) or low-protein (9 % casein; LP) diet in pregnancy were challenged with a high-fat diet at 9 months of age. To assess whether other maternal factors modulated the programming effects of nutrition, offspring were studied from young (2–4 months old) and older (6–9 months old) mothers. Weight gain with a high-fat diet was attenuated in male offspring of older mothers fed LP (interaction of maternal age and diet; P = 0·011) and adipose tissue deposition was lower with LP feeding in both males and females (P < 0·05). Although the resistance to weight gain and adiposity was partially explained by lower energy intake in offspring of LP mothers (P < 0·001 males only), it was apparent that energy expenditure must be influenced by maternal diet and age. Assessment of locomotor activity indicated that energy expenditure associated with physical activity was unlikely to explain resistance to weight gain, but showed that offspring of older mothers were more anxious than thoseof younger mothers, with more rearing observed in a novel environment and on the elevated plus-maze. The data showed that in addition to maternal undernutrition, greater maternal age may influence development and long-term body composition in the rat

CONFIRMING BPM THEORY IN CREATIVE INDUSTRY CONTEXT – A CASE STUDY IN THE GERMAN TV INDUSTRY

Creativity is an important predecessor of any innovation. In the creative industries, innovation is part of the daily business. However, only little is known about the management of business processes that involve creativity. A pioneer contribution in the field of IS is the theory of managing creativity-intensive processes (TMCP) (Seidel 2009). It provides an analytical perspective for the understanding and management of this special kind of business processes. However the theory was developed in a very specific context – the movie post production. With our contribution, we focus on the confirmation and possibly extension of the theory’s core concept of the creativity-intensive process (CIP) and its specifying properties. We conducted a multi-case study in the German TV industry guided by TMCP. The analyzed data resides from the context of the visual production process and the TV format (e.g. TV movie, quiz show, daily soap etc.) as its creative product. Our data supports the TMCP’s core concept and its properties. Moreover we identified the “degree of industrialization” of CIPs as a new emergent property class. The property of the creative potential was refined to product related, as well as process related creativity and the creative impulse. We contribute to the qualitative empirical validation of TMCP and thus broaden its relevance as an analytical device for Business Process Management (BPM) in other creative contexts. Moreover a better understanding for the management challenges in the industry under research is provided

Ингибирование асфальтосмолопарафиновых отложений водонефтяных эмульсий нефти Верхне-Салатского месторождения

High quality thin films of TbMnO3 were grown by pulsed laser deposition on orthorhombicYAlO(3) (1 0 0). The interface and surface roughness of a 55 nm thick film were probed by X-ray reflectometry and atomic force microscopy, yielding a roughness of 1 nm. X-ray diffraction revealed untwinned films and a small mosaic spread of 0.04 degrees and 0.2 degrees for out-of-plane and in-plane reflections, respectively. This high degree of epitaxy was also confirmed by Rutherford backscattering spectrometry. Using polarized neutron diffraction we could identify a magnetic structure with the propagation vector (0 0.27 0), identical to the bulk magnetic structure of TbMnO3. (C) 2011 Elsevier B.V. All rights reserved

Food Deprivation, Body Weight Loss and Anxiety-Related Behavior in Rats

In behavioral studies, food deprivation protocols are routinely used to initiate or maintain motivational states that are required in a particular test situation. However, there is limited evidence as to when food deprivation compromises animal welfare. This study investigated the effects of different lengths of food deprivation periods and restricted (fixed-time) feeding on body weight loss as well as anxiety-related and motivated behavior in 5–6 month old male and female Wistar rats. The observed body weight loss was not influenced by sex and ranged between 4% (16 h deprivation) to approximately 9% (fixed-time feeding). Despite significant body weight loss in all groups, the motivation to eat under the aversive test conditions of the modified open field test increased only after 48 h of food deprivation. Long-lasting effects on anxiety as measured in the elevated plus maze test 24 h after refeeding have not been observed, although fixed-time feeding could possibly lead to a lasting anxiogenic effect in female rats. Overall, female rats showed a more anxiolytic profile in both tests when compared to male rats. Despite these sex differences, results suggest that food deprivation is not always paralleled by an increased motivation to feed in a conflict situation. This is an important finding as it highlights the need for tailored pilot experiments to evaluate the impact of food deprivation protocols on animals in regard to the principles of the 3Rs introduced by Russell and Burch. View Full-Tex