Interplay of Soundcone and Supersonic Propagation in Lattice Models with Power Law Interactions

We study the spreading of correlations and other physical quantities in quantum lattice models with interactions or hopping decaying like $r^{-\alpha}$ with the distance $r$. Our focus is on exponents $\alpha$ between 0 and 6, where the interplay of long- and short-range features gives rise to a complex phenomenology and interesting physical effects, and which is also the relevant range for experimental realizations with cold atoms, ions, or molecules. We present analytical and numerical results, providing a comprehensive picture of spatio-temporal propagation. Lieb-Robinson-type bounds are extended to strongly long-range interactions where $\alpha$ is smaller than the lattice dimension, and we report particularly sharp bounds that are capable of reproducing regimes with soundcone as well as supersonic dynamics. Complementary lower bounds prove that faster-than-soundcone propagation occurs for $\alpha<2$ in any spatial dimension, although cone-like features are shown to also occur in that regime. Our results provide guidance for optimizing experimental efforts to harness long-range interactions in a variety of quantum information and signaling tasks.Comment: 20 pages, 8 figure

An Optimization Model for Valuating Process Flexibility

Although flexible processes are deemed critical for many companies and constitute a key concern of business process management, there is a lack of approaches for valuating process flexibility from an economic perspective and for determining an appropriate level of process flexibility. Today, companies do not know how flexible their processes should be. While generally advocating balanced investments, scholars provide concrete recommendations for very specific settings only. What is missing is a more general guidance and a deeper investigation of the positive economic effects of flexible processes, which are hard-to-measure and beset with risks. Against this backdrop, we propose an optimization model that enables determining the optimal level of process flexibility in line with the principles of value-based business process management. We also report on the insights gained from applying the optimization model to the production processes of an international company from the semi-conductor industry

The Business Value of Process Flexibility - An OptimizationModel and Its Application in the Service Sector

Promising to cope with increasing demand variety and uncertainty, flexibility in general and process flexibility in particular are becoming ever more desired corporate capabilities. During the last years, the business process management and the production/operations management communities have proposed numerous approaches that investigate how to valuate and determine an appropriate level of process flexibility. Most of these approaches are very restrictive regarding their application domain, neglect characteristics of the involved processes and outputs other than demand and capacity, and do not conduct a thorough economic analysis of process flexibility. Against this backdrop, the authors propose an optimization model that determines an appropriate level of process flexibility in line with the principles of valuebased business process management. The model includes demand uncertainty, variability, criticality, and similarity as process characteristics. The paper also reports on the insights gained from applying the optimization model to the coverage switching processes of an insurance broker pool compan

Digitalisation in sports journalism : opportunities and threats

In vorliegender Arbeit geht es um die Digitalisierung im Sportjournalismus und welche Chancen und Risiken damit verbunden sind. Ziel dieser Arbeit ist es dabei, aufzuzeigen wie die Berichterstattung über Sport durch die Digitalisierung neue Potenziale und Möglichkeiten gewinnt und wie Medien diese einsetzen können. Zur Beantwortung dieser Frage werden zwei Praxisbeispiele genutzt und eine Inhaltsanalyse betrieben, die ihren Schwerpunkt auf der Art der Berichterstattung, der Nutzung von digitalen Formaten und möglichen Verbesserungen in der Einbindung von Digitalisierung hat. Das Ergebnis der Arbeit wird letztlich darin liegen, zu zeigen wie Digitalisierung den Sportjournalismus in Zukunft weiter beeinflussen wird und worin die Chancen der einzelnen Medien liegen, durch die Digitalisierung zu profitieren

Impact of Different Time Interval Bases on the Accuracy of meteorological Data Based Drying Models for Oak (Quercus L.) Logs Stored in Piles for Energy Purposes

Natural drying of fuel wood is a feasible option to increase resource efficiency in biomass based energy supply. Meteorological data based drying models are the state-of-the-art to monitor the drying progress. The continuous weighing approach is used to gain data for developing these models. The aim of this study was to investigate the drying performance of oak (Quercus L.) logs stored in piles for energy purposes and assess the effect of model time interval base on the accuracy of meteorological data based drying models. The log pile’s moisture content dropped from initial 38.9% on February 1, 2013 to 24.8% on October 21, 2013, resulting in a total reduction of 14.1%. At the end, moisture content was distributed evenly within the logs and total dry matter losses were low (2.4%). From load and meteorological data, models were developed including 10-minute, hourly, daily and monthly time interval bases. Model performance was validated by comparing the model estimates to the basic observation. Models proved to be very accurate in estimating moisture content change. Compared to the observation, the hourly time interval based model was the most accurate option (mean deviation of 0.10 ±0.13%), while the least accurate option (10-min interval; 1.49 ±1.29%) was still reasonably accurate. Daily and monthly time interval based models are most suitable for use in the forest industry, as they are accurate, while requiring less extensive and detailed input data than models based on hourly or 10-minute time interval

Effect of Topping Trees on Biomass and Nitrogen Removal in the Thinning of Norway Spruce Stands

In Central Europe, full-tree (FT) harvesting is an increasingly common harvesting method in steep terrain harvesting due to the increased use of highly economical processor tower yarders. In conventional FT harvesting, nutrient removal from harvest sites is substantially higher than in cut-to-length (CTL) harvesting due to the extraction of nutrient-rich branches and foliage. One strategy to reduce the adverse impact of FT harvesting is to cut off the tops of felled trees prior to extraction (topping). The purpose of this study was to assess the effect of implementing topping treatments in FT harvesting on biomass and nutrient removal. The effect of conventional FT harvesting on the amount of logging residues left on the site was assessed in three different Norway spruce (Picea abies)-dominated stands following cable yarding operations by collecting logging residues from the forest floor. The additional effect of topping trees on the amount of logging residues was assessed by using biomass models. These models were created based on the data of 25 sample trees, which were felled and sampled destructively within the stands. The results show that conventional FT harvesting considerably increases nutrient removal in comparison to CTL, but still do not remove all nutrients from the sites. After conventional FT harvesting, 5–18% of the nutrients remained on the sites. Topping trees at a diameter of 8 cm substantially increased the amount of remaining nutrients to 30–34%

Monitoring Cable Tensile Forces of Winch-Assist Harvester and Forwarder Operations in Steep Terrain

The objective of this case study was to develop and test a specific survey protocol for monitoring tensile forces for winch-assisted harvesters and forwarders with a mounted or integrated constant-pull capstan winch technology. Based on the designed survey protocol, the interactions between work phases, machine inclination, and tensile forces in typical work conditions were analysed. The established workflow, including equipment and the developed analysis routines, worked appropriately and smoothly. The working load on the cable during the study did not exceed 50% of the maximum breaking strength. A maximum tensile force peak at 56 kN was observed during delays for the forwarder, and a peak of 75.5 kN was observed for the harvester, both of which are still within the safe working load when considering a safety factor of two