AbstractHistorically, epidemics and plagues are repeatedly reported to have happened since the ancient civilizations (Egypt, Greece, Rome and imperial China). Most known examples of a devastating global pandemics in recent history are the ‘Black Death’ (14th century) and the global influenza (1918-1919), also known as ‘Spanish Flu’, that has killed nearly 50 million people in the world. Even thoughpandemics may vary in their dimensions, length (short vs. long), scope (local/regional, national, global) and severity of effects (minimal effects or maximal effects), they all represent distinct exogenous and endogenous shocks that have far reaching effects on population, health, economy and other societal domains.Currently, the Covid-19 pandemic has relentlessly spreaded around the world, leaving behind destructive marks on health, populations, economies and societies. The Covid-19 could spread quickly around the globe because of the current structure of the global economy, which is highly interconnected through sophisticated global transport networks. An important characteristic of a suchnetworked complex system is it vulnerability to unattended events of systemic risk such as the Covid-19 pandemic for example. These systemic risks cause substantial cascading effects, which lead to extreme outcomes that could permanently alter economic, environmental, and social systems.In this article, we first, present, discuss and analyze the potential impacts of the Covid-19 on global economy, trade and supply chains, by focusing on Europe and/or the Netherlands. Second, we examine the effects of the Covid-19 crisis on the shipping industry and on the hub ports and the policy measures that have been applied by different countries around the world.
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The authors demonstrate how simulation games can be used to test and explore initial infrastructure designs before they are implemented. Games can provide important learning experiences for (future) designers and managers. The case study of a computer-supported simulation game, SIM Maasvlakte 2 (SIM MV2), uses a game whose object is to design and allocate land for the Maasvlakte 2 port area, to be built between 2006 and 2036 in the Port of Rotterdam, the Netherlands. The evaluation aimed at improving the game, examining the system complexity of the seaport, and establishing corresponding learning effects among the participants.
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In this paper, the authors explore the possible contribution of serious games for advanced academic and/or professional learning in particular to support the decision-making andmanagement of complex infrastructures, such as utilities, ports and wind farms. The developments of the computer industry make it more attractive to add computer technology into simulation games to make the results of the game more realistic and so achieve more learning with the participants. In the future this will be more important to make the games still attractive for the players, because they are grown up with computers, e-learning and online communication. An example of a case study of SIM Maas, a simulation game about the development of the Port of Rotterdam (PoR), will be given. This case illustrates the use of computer-based simulation-games for professional learning.
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With the increase of needs for controlling the passengers that use different modes of transport such as airports, ports, trains, or future ones as hyper loops, security facilities are a key element to be optimized. In the current study, we present an analysis of a security area within an airport with particular restrictions. To improve the capacity, different categories and policies were devised for processing passengers and we propose to adapt the system to these categories and policies. The results indicated that, by designing a proper category in combination with novel technology, it is possible to increase the capacity to values of 2 digits (in terms of passengers/day). As a proof-of-concept, we use a case study of an area within an airport in Mexico based on data and layout of early 2019.
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Neighborhood image processing operations on Field Programmable Gate Array (FPGA) are considered as memory intensive operations. A large memory bandwidth is required to transfer the required pixel data from external memory to the processing unit. On-chip image buffers are employed to reduce this data transfer rate. Conventional image buffers, implemented either by using FPGA logic resources or embedded memories are resource inefficient. They exhaust the limited FPGA resources quickly. Consequently, hardware implementation of neighborhood operations becomes expensive, and integrating them in resource constrained devices becomes unfeasible. This paper presents a resource efficient FPGA based on-chip buffer architecture. The proposed architecture utilizes full capacity of a single Xilinx BlockRAM (BRAM36 primitive) for storing multiple rows of input image. To get multiple pixels/clock in a user defined scan order, an efficient duty-cycle based memory accessing technique is coupled with a customized addressing circuitry. This accessing technique exploits switching capabilities of BRAM to read 4 pixels in a single clock cycle without degrading system frequency. The addressing circuitry provides multiple pixels/clock in any user defined scan order to implement a wide range of neighborhood operations. With the saving of 83% BRAM resources, the buffer architecture operates at 278 MHz on Xilinx Artix-7 FPGA with an efficiency of 1.3 clock/pixel. It is thus capable to fulfill real time image processing requirements for HD image resolution (1080 × 1920) @103 fcps.
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Abstract: Climate change is related with weather extremes, which may cause damages to infrastructure used by freight transport services. Heavy rainfall may lead to flooding and damage to railway lines, roads and inland waterways. Extreme drought may lead to extremely low water levels, which prevent safe navigation by inland barges. Wet and dry periods may alternate, leaving little time to repair damages. In some Western and Middle-European countries, barges have a large share in freight transport. If a main waterway is out of service, then alternatives are called for. Volume- and price-wise, trucking is not a viable alternative. Could railways be that alternative? The paper was written after the unusually long dry summer period in Europe in 2022. It deals with the question: If the Rhine, a major European waterway becomes locally inaccessible, could railways (temporarily) play a larger role in freight transport? It is a continuation of our earlier research. It contains a case study, the data of which was fed into a simulation model. The model deals with technical details like service specification route length, energy consumption and emissions. The study points to interesting rail services to keep Europe’s freight on the move. Their realization may be complex especially in terms of logistics and infrastructure, but is there an alternative?
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Digitalization enables public organizations to personalize their services, tuning them to the specific situation, abilities, and preferences of the citizens. At the same time, digital services can be experienced as being less personal than face-to-face contact by citizens. The large existing volume of academic literature on personalization mainly represents the service provider perspective. In contrast, in this paper we investigate what makes citizens experience a service as personal. The result are eight dimensions that capture the full range of individual experiences and expectations that citizens expressed in focus groups. These dimensions can serve as a framework for public sector organizations to explore the expectations of citizens of their own services and identify the areas in which they can improve the personal experiences they offer.
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Recent years have seen a global rise in the failure of tailings dams. Studies investigating the causes of slope failure often recognise high intensity rainfall events to significantly contribute to liquefaction, erosion and overtopping. This study aims to investigate the influence of alternative physical and geohydrological processes that, under tension saturation conditions, contribute to slope instability in tailings dams. It has been suggested that the generation of transient pressure wave mechanisms by high intensity rainfall events, surface ponding and wetting front advancement result in the formation of an induced pressure head that triggers the mobilization of pre-event water. In order to quantify these physical processes, this study included the analysis of rapid transmission conditions in a silica fines mix, with similar physical and hydraulic characteristics as platinum tailings. A tall leak-proof soil column, containing the soil sample compacted to in-situ dry bulk density, was fitted with seven observation ports. Each port consisted of a pore air pressure probe, a mini tensiometer and a time domain reflectometry probe. After set-up and initial stabilisation, three separate artificial high intensity rainfall events were applied to the surface. Monitoring of hydraulic state variables was recorded at thirty second intervals by automatic logging, thereby enabling the analysis of measured outcomes. Observations showed instant spikes in pore air pressure ahead of the wetting front, as well as a number of delayed responses. The interpretation of lab results led to the conclusion that pressure diffusion mechanisms throughout the porous medium, could result in the rapid release and mobilisation of previously stagnant antecedent moisture, thereby enabling phreatic levels to rising rapidly and in excess to the amount of surface infiltration. Also, since an increase in pore water pressure is likely to cause a reduction in shear strength, it is suggested that these physical and geohydrological processes could have an adverse impact on the stability of tailings dams.
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Welke competenties heeft de publieke professional nodig om de circulaire economie op bedrijventerreinen met ondernemers en/of eigenaren aan te jagen? En welke organisatievorm en manier van samenwerking op een terrein is daarvoor nodig? Deze vragen staan centraal in het tweejarige NWO-SIA onderzoek Samen Beter van de Fontys Hogeschool en de HAN University of Applied Sciences met financiële ondersteuning van regieorgaan SIA. Tijdens een bijeenkomst in Arnhem op 25 januari 2024 werd een update van het onderzoek gedeeld. Aanvullend daarop gaven het PBL en de Stec groep gelet op de maatschappelijke actualiteit een presentatie over de ruimtebehoefte van de circulaire economie op bedrijventerrein, en hoe daar nu op te anticiperen.
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Arsenic contamination of groundwater is a major public health concern worldwide. The problem has been reported mainly in southern Asia and, especially, in Bangladesh. Slow-sand filters (SSF) augmented with iron were proven to be a simple, low-cost and decentralized technique for the treatment of arsenic-contaminated sources. In this research, three pilot-scale SSF (flowrate 6 L·h−1) were tested regarding their capability of removing arsenic from groundwater in conditions similar to those found in countries like Bangladesh (70 µg As(III) L−1, 26 °C). From the three, two filters were prepared with mixed media, i.e., sand mixed with corrosive iron matter (CIM filter) and iron-coated sand (ICS filter), and a third conventional SSF was used as a reference. The results obtained showed that the CIM filter could remove arsenic below the World Health Organization (WHO) guideline concentration of 10 µg·L−1, even for inlet concentrations above 150 µg·L−1. After 230 days of continuous operation the arsenic concentration in the effluent started increasing, indicating depletion or saturation of the CIM layer. The effluent arsenic concentration, however, never exceeded the Bangladeshi standard of 50 µg·L−1 throughout the whole duration of the experiments.
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