82 research outputs found
THE VACUUM OF THE HOEGH-KROHN MODEL AS A GENERALIZED WHITE NOISE FUNCTIONAL
No full textAlbeverio S, HIDA T, POTTHOFF J, Streit L. THE VACUUM OF THE HOEGH-KROHN MODEL AS A GENERALIZED WHITE NOISE FUNCTIONAL. PHYSICS LETTERS B. 1989;217(4):511-514
Spatially distributed modelling of hydro-meteorological hazards for a physical deterministic analysis of flash flood occurrence: A case study in Khao Yai National Park, Thailand
No full textDue to rising temperatures, rainfall patterns around the world are being affected, causing extreme precipitation events to become more frequent and intense, resulting in an increased probability of severe flash floods. Thailand is no exception to the increased risk of these hazards, which is why Early Warning Systems are being set up. Since flash floods occur within a few hours after the triggering precipitation event, timely and accurate precipitation observations are critical, to enable timely warning and evacuation of inhabitants to mitigate the risk. One solution for this is the use of rain radar, which provides rain data with high spatial and temporal resolutions. An analysis of this technique was chosen to form the basis of this research in Northeastern Thailand's Lam Takhlong basin. The objective was to investigate the importance of using distributed precipitation data. In this research, the hydrological response of the catchment of interest was studied. The ability of the physically-based, conceptual and distributed CALEROS model to capture this response was assessed. Different modelling strategies and sources of precipitation input were analysed, and the additional value of using distributed precipitation data was determined. The examination of multiple hydrological characteristics in the study area shows great heterogeneity of the catchments response to precipitation. A clear differentiation can be made between the hydrological response of the upstream and downstream part of the catchment. Additionally, the results from the catchment characterisation indicate great spatial variability of the precipitation patterns in the study area. This is confirmed when using the CALEROS model to recreate the catchments hydrology. Four modelling strategies were used, varying by spatial and temporal constancy. Calibration performed using uniform precipitation showed to be incapable of capturing the discharge trends in the catchment, failing to properly catch the observed peaks as well as the base flow. Runs performed using distributed precipitation maps obtained by Inverse Distance interpolation of rain gauge data showed significantly better results, adequately capturing the trend of the discharge observed in the catchment. Differences in parameterisation only had limited effect on the outcome, making the precipitation input the most important parameter. Runs using synthetic precipitation data demonstrated the importance of properly capturing the precipitation pattern and movement across the catchment, as it greatly influences the timing of occurring discharge peaks. A comparison between rain gauge data and rain radar data shows that, although data quality of the rain gauges seems acceptable, rain gauges are not capable of properly capturing rainfall patterns, while rain radar does. Precipitation patterns were found to be the most crucial parameter for modelling of flash floods in the area of interest, signifying the importance of using rain radar data for accurate flash flood forecasting.Civil Engineerin
Group-analytic Practice Today: Intersubjective Perspectives and the Relational Paradigm
No full textOver the past 50 years psychoanalysis and group analysis have quite moved apart from each other with very little exchange and cooperation left, while the pioneers of group analysis (Foulkes, Bion) emphasized the link with psychoanalysis. With the ‘intersubjective turn’ in psychoanalysis during the 1980s substantial common ground for group analysis and psychoanalysis has emerged, but not been completely recognized and appreciated in both disciplines. The author demonstrates areas of possible overlap and cross-fertilization mainly drawing on concepts from relational psychoanalysis. The idea of the inevitable embeddedness of analyst and analysand in the psychoanalytic process has already been present in Foulkes’ writings concerning the role of the conductor, but not very much elaborated. Other relational concepts like dissociation, enactment, mutuality and self-disclosure might be fruitfully integrated into contemporary group-analytic theorizing, too. Conversely, group-analytic perspectives could increase awareness of the importance of context (social, cultural, institutional) also for the dynamics of individual analysis. The understanding of group processes could help to grasp and negotiate more successfully the notorious difficulties in psychoanalytic institutions. To illustrate theory the author presents detailed material from a group session.</jats:p
Improving the capacity and performance assessment of railway nodes on the French network
No full textCapacity and performance (evaluated through delay propagation) analysis methods have mostly focused on railway line track sections, but less attention has been given to nodes. Still, a few analytical methods for the capacity and performance assessment of the switch areas between station platform tracks and line tracks can be classified upon their reliance on a timetable (“timetable-based” methods) or not (“timetable-free” methods). The relation between capacity utilisation and performance has rarely been tested for railway nodes, and critical capacity utilisation thresholds remain to be investigated. The comparison of timetable-based and timetable-free methods also needs to be conducted. Filling these knowledge gaps will help the French infrastructure manager SNCF Réseau improve its analyses of nodes capacity utilisation and performance in the long-term planning stages. This paper investigates a small set of timetable-based and timetable-free methods either taken and adapted from the literature, such as the Potthoff and UIC 406 methods, or developed for the need of this research, such as adaptations of the UIC method and a method developed from SNCF Réseau’s previous works. The methods are applied on a case study on the French network, first evaluating their indicators’ magnitude and trends with artificial traffic data, and then comparing their outputs to real data. It is found that the Potthoff method and a timetable-free UIC-adapted method for capacity utilisation evaluation and an SNCF-adapted method for delay propagation provided results that are relevant in terms of magnitude and trends for long-term assessment. The timetable-based UIC 406 method for node capacity utilisation assessment can be used to study specific timetables. No satisfactory timetable-based delay propagation method was found in this paper. The timetable-free methods are further used to study the capacity utilisation – delay propagation relationship, which takes the form of an exponential function. Attempts to determine capacity utilisation thresholds are also conducted. It is recommended to perform further research with extended traffic data on different node layouts to consolidate these preliminary findings before applying them in real studies.Transport, Infrastructure and Logistic
Telemedicine and Integrated Multidisciplinary Care for Pediatric IBD Patients: A Review
No full textThe global COVID-19 pandemic brought with it an unprecedented, widespread implementation of telemedicine services, requiring pediatric inflammatory bowel disease (IBD) providers to shift in-person clinic visits to a virtual platform. With the passing of the one-year anniversary of the global pandemic, telemedicine continues to be offered and utilized. Although it remains unclear as to the extent to which telemedicine services will be used in the future, it is critical to understand how integrated multidisciplinary treatment—the standard of care in pediatric IBD—is delivered through a virtual platform. This paper provides an overview of the existing literature examining integrated multidisciplinary care for pediatric IBD provided via telemedicine. The author also presents one integrated multidisciplinary IBD program’s response to the global pandemic and subsequent transition to telemedicine. Challenges around implementation and directions for future research in this area are also discussed
Improving the Functional Safety of Automotive Batteries Using in-situ Impedance Spectroscopy
No full textAbstractSafe operation of Li-ion traction batteries in electric cars is one of the main requirements for a broad acceptance of this technology. Safety critical factors such as over-temperature conditions must be reliably monitored and captured. Increasingly strict safety regulations in the automotive sector imply rising challenges to both car manufacturers and battery system suppliers and hence resilient, reliable yet inexpensive tools for battery state diagnosis are necessary to address these topics. The approach presented here is a battery diagnosis tool based on in-situ galvanostatic electrochemical impedance spectroscopy which can be integrated into a standard battery management system. The algorithms which are used to convert the impedance measurements into valuable battery temperature estimations are based on numeric correlations between the impedance and these state variables. This method improves the safety in electric cars during the usage of a battery pack by redundant monitoring of the battery temperature
Column Generation with Dynamic Duty Selection for Railway Crew Rescheduling
No full textThe Dutch railway network experiences about three large disruptions per day on average. In this paper, we present an algorithm to reschedule the crews when such a disruption occurs. The algorithm is based on column generation techniques combined with Lagrangian heuristics. Since the number of duties is very large in practical instances, we first define a core problem of tractable size. If some tasks remain uncovered in the solution of the core problem, we perform a neighborhood exploration to improve the solution. Computational experiments with real-life instances show that our method is capable of producing good solutions within a couple of minutes of computation time. [ABSTRACT FROM AUTHOR
An Uncertain Future—The Evolution of the Advertising Agency
No full textabstract: The advertising agency, in its variety of forms, is one of the most powerful forces in the modern world. Its products are seen globally through various multimedia outlets and they strongly impact culture and economy. Since its conception in 1843 by Volney Palmer, the advertising agency has evolved into the recognizable—and unrecognizable—firms scattered around the world today. In the United States alone, there are roughly 13.4 thousand agencies, many of which also have branches in other countries. The evolution of the modern advertising agency coincided with, and even preceded, some of the major inflection points in history. Understanding how and why changes in advertising agencies affected these inflection points provides a glimpse of understanding into the relationship between advertising, business, and societal values.
In the pages ahead we will explore the future of the advertising industry. We will analyze our research to uncover the underlying trends pointing towards what is to come and work to apply those explanations to our understanding of advertising in the future
Strahlung von Sendeanlagen und Gesundheit : Bewertung von wissenschaftlichen Studien im Niedrigdosisbereich (Stand: Dezember 2012)
No full textThis report updates the assessment of the health effects of high-frequency radiation based on newly published studies on human beings in the period from October 2006 to December 2012. It takes account of experimental field studies, epidemiological studies of population groups in their everyday environment and experimental studies with short-term exposure under controlled conditions in the laboratory, in which the influence of high-frequency radiation from fixed facilities such as broadcasting transmitters and mobile telephone base stations was studied. In the past six years, approximately 50 studies on this topic were published. Generally speaking, exposure to high-frequency radiation from fixed transmitters is pleasingly low, and at this exposure level no harmful effects on health have been scientifically established to date. In view of this, there is no call for a modification of the ambient limit values specified in the Ordinance relating to Protection from Non-Ionising Radiation (ONIR). With respect to the nonthermal effects of high-frequency radiation, there are still many gaps in scientific knowledge. In particular, there are almost no methodologically sound long-term observations. It is therefore not possible to make a reliable assessment of any potential longterm risks at this time, and consequently caution is called for, especially with regard to long-term exposure to high-frequency radiation
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