Session B4: Movement Patterns of Several Fish Species Approaching and Passing a Vertical Slot Fishway

Abstract: Knowledge of fish behaviour at obstacles is still limited and therefore uncertainties exist regarding measures that have to be taken to ensure fish passage. One question that arises is whether fish, when encountering a barrier, tend to show searching behaviour or literally get trapped in a dead end while following migratory stimuli. To shed some light on this question, migration patterns of fish were investigated by using PIT technology at a vertical slot fishway with two entrances at the river Moselle. Additionally, sonar images were recorded by two DIDSON sonars at the entrances. Tagged fish (roach, nase, brown trout, river lamprey among others) were stocked in the tailwater. The research setup consisted of HDX-antennae at the entrances as well as antennae at ten slots along the fishway. At the entrance, appearance and passage time of the tagged fish was registered. Comparing these signals from every HDXantenna along the fishway allowed analysis of fish passing individual sections or interrupting their upstream movement. Sonar recordings in front of the entrances were analysed with a focus on fish abundance and fish behaviour. We observed species-dependent differences in the preference for an entrance location and configuration. Some individuals were found at both entrances, indicating a failed entrance attempt, followed by searching behaviour. However, most fish that passed the entrance structures showed a continuous upstream movement pattern. These results help to understand fish behaviour at obstacles and may contribute to the improvement of fishways, especially with respect to location and construction of entrances as well as the passage of fishway sections

Session B4: Ethohydraulics in Turbulence: Fish Behaviour in Turning Pools

Abstract: Space restrictions often necessitate the incorporation of turning pools in the design of fishways. Several biological studies have identified potential problems fish have with turning pools, varying from disproportionate residence times, flow negotiating difficulties and even fish leaping out of the turning pool. Likewise, our research on fish passage times of a vertical slot fishway on the river Mosel in Germany, detected significant time lags in turning pools. A number of potential explanations have been stated in the literature including confusion associated with large vortices, turbulence and complex flows, flow characteristics exceeding the swimming abilities of the fish, or fish could be using such basins to rest. The actual activity within these turning basins remains unknown and represents an important knowledge gap. This paper presents the results of an HDX and sonar monitoring campaign, registering behaviour in a turning pool in a vertical slot fishway on the river Mosel in Germany, where increased passage times were recorded for several fish species in turning pools. Behavioural patterns like residence times, acc- and deceleration, resting and swimming tracks for both up- and downward migration are related to flow direction patterns described in a 3D hydraulic model. The results offer insights in the behavioural characteristics of migrating fish in turbulent basins, with direct implications on technical design features like rounded basins and additional baffle walls

Some Agents are more Similar than Others:Customer Orientation of Frontline Robots and Employees

Purpose: The impact of frontline robots (FLRs) on customer orientation perceptions remains unclear. This is remarkable because customers may associate FLRs with standardization and cost-cutting, such that they may not fit firms that aim to be customer oriented. Design/methodology/approach: In four experiments, data are collected from customers interacting with frontline employees (FLEs) and FLRs in different settings. Findings: FLEs are perceived as more customer-oriented than FLRs due to higher competence and warmth evaluations. A relational interaction style attenuates the difference in perceived competence between FLRs and FLEs. These agents are also perceived as more similar in competence and warmth when FLRs participate in the customer journey's information and negotiation stages. Switching from FLE to FLR in the journey harms FLR evaluations. Practical implications: The authors recommend firms to place FLRs only in the negotiation stage or in both the information and negotiation stages of the customer journey. Still then customers should not transition from employees to robots (vice versa does no harm). Firms should ensure that FLRs utilize a relational style when interacting with customers for optimal effects. Originality/value: The authors bridge the FLR and sales/marketing literature by drawing on social cognition theory. The authors also identify the product categories for which customers are willing to negotiate with an FLR. Broadly speaking, this study’s findings underline that customers perceive robots as having agency (i.e. the mental capacity for acting with intentionality) and, just as humans, can be customer-oriented.</p

Archeologische prospectie met ingreep in de bodem Geel Kannunikenblok

Dit rapport werd ingediend bij het agentschap samen met een aantal afzonderlijke digitale bijlagen. Een aantal van deze bijlagen zijn niet inbegrepen in dit pdf document en zijn niet online beschikbaar. Sommige bijlagen (grondplannen, fotos, spoorbeschrijvingen, enz.) kunnen van belang zijn voor een betere lezing en interpretatie van dit rapport. Indien u deze bijlagen wenst te raadplegen kan u daarvoor contact opnemen met: [email protected]

Archeologische prospectie met ingreep in de bodem Beringen, Bogaersveldstraat

Dit rapport werd ingediend bij het agentschap samen met een aantal afzonderlijke digitale bijlagen. Een aantal van deze bijlagen zijn niet inbegrepen in dit pdf document en zijn niet online beschikbaar. Sommige bijlagen (grondplannen, fotos, spoorbeschrijvingen, enz.) kunnen van belang zijn voor een betere lezing en interpretatie van dit rapport. Indien u deze bijlagen wenst te raadplegen kan u daarvoor contact opnemen met: [email protected]

A unified approach for process-based hydrologic modeling: 1. Modeling concept

This work advances a unified approach to process-based hydrologic modeling to enable controlled and systematic evaluation of multiple model representations (hypotheses) of hydrologic processes and scaling behavior. Our approach, which we term the Structure for Unifying Multiple Modeling Alternatives (SUMMA), formulates a general set of conservation equations, providing the flexibility to experiment with different spatial representations, different flux parameterizations, different model parameter values, and different time stepping schemes. In this paper, we introduce the general approach used in SUMMA, detailing the spatial organization and model simplifications, and how different representations of multiple physical processes can be combined within a single modeling framework. We discuss how SUMMA can be used to systematically pursue the method of multiple working hypotheses in hydrology. In particular, we discuss how SUMMA can help tackle major hydrologic modeling challenges, including defining the appropriate complexity of a model, selecting among competing flux parameterizations, representing spatial variability across a hierarchy of scales, identifying potential improvements in computational efficiency and numerical accuracy as part of the numerical solver, and improving understanding of the various sources of model uncertainty.Keywords: unified model, hydrometeorology, scaling behavio

Toward Open and Reproducible Environmental Modeling by Integrating Online Data Repositories, Computational Environments, and Model Application Programming Interfaces

Cyberinfrastructure needs to be advanced to enable open and reproducible environmental modeling research. Recent efforts toward this goal have focused on advancing online repositories for data and model sharing, online computational environments along with containerization technology and notebooks for capturing reproducible computational studies, and Application Programming Interfaces (APIs) for simulation models to foster intuitive programmatic control. The objective of this research is to show how these efforts can be integrated to support reproducible environmental modeling. We present first the high-level concept and general approach for integrating these three components. We then present one possible implementation that integrates HydroShare (an online repository), CUAHSI JupyterHub and CyberGIS-Jupyter for Water (computational environments), and pySUMMA (a model API) to support open and reproducible hydrologic modeling. We apply the example implementation for a hydrologic modeling use case to demonstrate how the approach can advance reproducible environmental modeling through the seamless integration of cyberinfrastructure services

Randomized trial of a GPIIb/IIIa platelet receptor blocker in refractory unstable angina

BACKGROUND: Patients with unstable angina despite intensive medical therapy, ie, refractory angina, are at high risk for developing thrombotic complications: myocardial infarction or coronary occlusion during percutaneous transluminal coronary angioplasty (PTCA). Chimeric 7E3 (c7E3) Fab is an antibody fragment that blocks the platelet glycoprotein (GP) IIb/IIIa receptor and potently inhibits platelet aggregation. METHODS AND RESULTS: To evaluate whether potent platelet inhibition could reduce these complications, 60 patients with dynamic ST-T changes and recurrent pain despite intensive medical therapy were randomized to c7E3 Fab or placebo. After initial angiography had demonstrated a culprit lesion suitable for PTCA, placebo or c7E3 Fab was administered as 0.25 mg/kg bolus injection followed by 10 micrograms/min for 18 to 24 hours until 1 hour after completion of second angiography and PTCA. During study drug infusion, ischemia occurred in 9 c7E3 Fab and 16 placebo patients (P = .06). During hospital stay, 12 major events occurred in 7 placebo patients (23%), including 1 death, 4 infarcts, and 7 urgent interventions. In the c7E3 Fab group, only 1 event (an infarct) occurred (3%, P = .03). Angiography showed improved TIMI flow in 4 placebo and 6 c7E3 Fab patients and worsening of flow in 3 placebo patients but in none of the c7E3 Fab patients. Quantitative analysis showed significant improvement of the lesion in the patients treated with c7E3 Fab, which was not observed in the placebo group, although the difference between the two treatment groups was not significant. Measurement of platelet function and bleeding time demonstrated > 90% blockade of GPIIb/IIIa receptors, > 90% reduction of ex vivo platelet aggregation to ADP, and a significantly prolonged bleeding time during c7E3 Fab infusion, without excess bleeding. CONCLUSIONS: Combined therapy with c7E3 Fab, heparin, and aspirin appears safe. These pilot study results support the concept that effective blockade of the platelet GPIIb/IIIa receptors can reduce myocardial infarction and facilitate PTCA in patients with refractory unstable angina