Hamburg Port Consulting (Germany)

This paper investigates power quality (PQ) issues in the medium-voltage network at the Deutsches Elektronen-Synchrotron (DESY) in Hamburg, Germany. The study focuses on voltage disturbances, harmonic distortions, and flicker levels that affect sensitive research equipment. DESY currently defines the voltage quality using EN 506160 and refers to IEC 61000-3 for permissible network disturbances. Field measurements using advanced data acquisition tools revealed voltage dips, swells, and harmonics exceeding thresholds defined by IEC 61000-3 and IEEE 519. Flicker analysis indicated irregular voltage fluctuations due to dynamic load changes. Despite ongoing efforts aim to refine PQ management through updated guidelines in the DESY planning manual, the findings in this paper suggest that compliance with existing standards alone is insufficient for ensuring power stability in specialized research environments. This study provides key insights for developing proactive PQ solutions tailored to industrial facilities like DESY.

Abstract Introduction: For the treatment of sudden cardiac death, the prompt deployment of an automated external defibrillator (AED) has been shown to significantly improve survival rates (1). Since 2007, the availability of AEDs on seagoing vessels flying the German flag has been legally mandated. This study aims to assess the availability of AEDs on such vessels and their utilization in emergency situations on board. Subjects and Methods: A monocentric retrospective analysis was conducted to evaluate the utilization of AEDs on board. A total of 43 nautical officers completed a questionnaire covering an observational period of the past 10 years. The ship officers were interviewed on board vessels in the Port of Hamburg between August and December 2018, corresponding to an observation period of 8600 seafarer-years. Results: An AED was present on 100% of German-flagged seagoing vessels and 52.2% of non-German-flagged seagoing vessels. Of the 43 health officers surveyed, 38 did not use an AED. Among living patients, four officers used the AED once to deliver a shock, while one respondent used it twice. The five early defibrillations performed occurred following observed cardiovascular arrests and correspond to an annual prevalence of sudden cardiac death of 6 per 100,000 seafarers. Three patients (60%) were successfully defibrillated. Conclusions: The medical requirements for German-flagged ships are playing a pioneering role internationally in the equipping of seagoing vessels with AEDs. Given the unique conditions at sea and the lack of timely on-site emergency medical care – both of great importance – the availability of an AED on board appears to be highly beneficial.

The spatial distribution of root water uptake at the ecosystem scale is difficult to assess, and therefore our knowledge of how ecosystem-related and abiotic factors affect root water uptake and its patterns is still limited. This presentation summarizes the results of observations of root water uptake in two contrasting vegetation types: grassland and forest along community diversity gradients.Based on field studies in both a grassland and a forest system, we investigated how root water uptake changes with ecosystem assembly. We used a water balance method to estimate (a) vertical profiles of root water uptake in grassland systems and (b) horizontal distribution of water uptake in forests, in both cases along species diversity gradients. In both cases, we find that species diversity strongly affects the location and increases the magnitude of root water uptake. In grasslands, the relationship can be directly linked to deeper uptake by species with deep root systems and higher water requirements, suggesting complementarity in resource use. In forests, uptake is enhanced in the main root zone where both the number of tree species and basal area are high, although the underlying mechanisms remain elusive. Overall, our observations show an enhanced capacity for water uptake in diverse ecosystems.In the future, further insights will be gained by combining techniques for assessing root water uptake at the individual and ecosystem scale together with plant and soil hydraulic assessments.

Augmented Reality (AR) technology has been widely investigated to support various navigation tasks, including initial approaches that suggest its potential use on ships. For maritime navigation, skippers use a variety of information displayed on a ship’s bridge. However, the constant shift of focus between this information and the outside view of the ship might pose cognitive as well as safety challenges. Here, AR could facilitate the navigation of ships by overlaying the real-world view with spatially anchored visual navigation aids. Despite this potential, previous work mainly presents conceptual approaches, technical tests, or user studies performed in ship simulators only.In this paper, we evaluate an AR-based assistance system in the actual real-world water environment, where technical issues and varying physical conditions could influence the system’s usability. In collaboration with hydrographic experts following a user-centered design approach, a functional AR system was developed that virtually displays navigation aids on the water surface. In a field study, ten skippers used the system to navigate a ship along a path through a port area. We assessed the accuracy, perceived workload, and user experience of participants. In addition, qualitative feedback was thematically analyzed to retrieve insights about the skippers’ attitude regarding using AR on actual ships. We report lessons learned about aspects such as ergonomics, perceived safety challenges, as well as envisioned further use cases and extended data integration.

Abstract In den vergangenen Jahren ist ein erhebliches Größenwachstum im Bereich der Großcontainerschiffe (ULCVs) zu beobachten. Durch das Liegen dieser Schiffe mit Windangriffsflächen von bis zu 18.000 m2 an den bestehenden Kaianlagen kann es bei Starkwindsituationen zu Überlastungen der Poller‐ und Fendersysteme als auch der schiffsseitigen Vertäueinrichtungen kommen. Mit dem Wissen, dass statische Vertäuberechnungen zukünftig zur Beurteilung der Anforderungen an Kaimauern sowie der Vertäueinrichtungen der ULCVs nicht mehr ausreichen, hat die HPA (Hamburg Port Authority) mit externen Partnern die Entwicklung eines cloudbasierten IT‐System für dynamische Vertäuanalysen vorangetrieben. Neben der Softwareentwicklung wurde von der HPA das Pollerzugversuchsprogramm entwickelt. Ziel war es, durch unterschiedliche Probebelastungen Grundlagenforschung an existierenden Pollern zu betreiben. Beteiligungen an Ausschüssen der EAU und Arbeitsgruppen der PIANC gehören ebenso dazu wie das internationale JIP‐Projekt WINDLASS, in dem die HPA gemeinsam mit Rotterdam und Antwerpen involviert ist. In dem JIP sollen Grundlagen zu lokalen Windfeldern im Hafen ermittelt werden und bei der Beurteilung von Starkwindsituationen unterstützen. Durch die kontinuierliche Weiterentwicklung und den Einsatz des Vertäuprogramms sowohl im Bereich der Großcontainerschiffe als auch zukünftig bei Kreuzfahrtschiffen, RoRo‐Schiffen, Bulkern, aber auch Hafenplanungen kann das Sicherheitsniveau im Hamburger Hafen weiter erhöht werden.

A community of developers has formed to modernize the Fortran ecosystem. In this article, we describe the high-level features of Fortran that continue to make it a good choice for scientists and engineers in the 21st century. Ongoing efforts include the development of a Fortran standard library and package manager, the fostering of a friendly and welcoming online community, improved compiler support, and language feature development. The lessons learned are common across contemporary programming languages and help reduce the learning curve and increase adoption of Fortran.

This paper reports the synthesis and characterization of monomers itaconic anhydride (IA) and tri-O-acetyl-D-glucal (TAG) as well as 4,6-di-O- -acetyl-D-glucal (PSG). The homopolymers and copolymers of IA and TAG were synthesized via free radical copolymerization in bulk, using azobisisobutyronitrile as an initiator with different feed ratios of monomers. Their structural, molecular and thermal characterization was done using 1H-NMR spectroscopy, gel permeation chromatography and differential scanning calorimetry, respectively. The glass transition temperature (Tg) of copolymers was found in the range of 139?145 ?C. The highest Tg was found for IA?TAG2 copolymers, whereas IA?TAG4 copolymer showed lowest Tg. The molecular weight of the copolymers was in the range 5157?5499 g mol-1. The monomer TAG undergoes Ferrier rearrangement in water to give PSG. The antimicrobial activity of IA, TAG, PSG and IA?TAG copolymers was studied using the minimum microbicidal concentration-broth dilution method. TAG, IA and PSG, as well as homopolymer and copolymers of IA and TAG are excellent antimicrobial agents.