155 research outputs found

    The Effects of Varying Penetration Rates of L4-L5 Autonomous Vehicles on Fuel Efficiency and Mobility of Traffic Networks

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    Microscopic traffic simulators that simulate realistic traffic flow are crucial in studying, understanding and evaluating the fuel usage and mobility effects of having a higher number of autonomous vehicles (AVs) in traffic under realistic mixed traffic conditions including both autonomous and non-autonomous vehicles. In this paper, L4-L5 AVs with varying penetration rates in total traffic flow were simulated using the microscopic traffic simulator Vissim on urban, mixed and freeway roadways. The roadways used in these simulations were replicas of real roadways in and around Columbus, Ohio, including an AV shuttle routes in operation. The road-specific information regarding each roadway, such as the number of traffic lights and positions, number of STOP signs and positions, and speed limits, were gathered using OpenStreetMap with SUMO. In simulating L4-L5 AVs, the All-Knowing CoEXist AV and a vehicle with Wiedemann 74 driver were taken to represent AV and non-AV driving, respectively. Then, the driving behaviors, such as headway time and car following, desired acceleration and deceleration profiles of AV, and non-AV car following and lane change models were modified. The effect of having varying penetration rates of L4-L5 AVs were then evaluated using criteria such as average fuel consumption, existence of queues and their average/maximum length, total number of vehicles in the simulation, average delay experience by all vehicles, total number of stops experienced by all vehicles, and total emission of CO, NOx and volatile organic compounds (VOC) from the vehicles in the simulation. The results show that while increasing penetration rates of L4-L5 AVs generally improve overall fuel efficiency and mobility of the traffic network, there were also cases when the opposite trend was observed

    Strategies for responding to pandemic risk: removal and/or redistribution

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    The pandemic has an ongoing financial impact on the global economy, resulting in its uninsurability and ultimately an insurance protection gap. While solutions exist to address other protection gaps caused by large-scale disasters such as repeated flooding, earthquakes, and terrorism, pandemics differ and require novel solutions. This paper builds on Jarzabkowski et al.’s (2018) strategic response framework to large-scale, catastrophic disasters and applies it to the pandemic insurance protection gap. Set in the U.K. context, the research empirically studies various insurance solutions that are being proposed for pandemic risk and presents and evaluates four types of responses

    EXPRESS: Translating, co-creating, and performing: reflections on a 15-year journey for impact into the grand challenge of disaster insurance

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    The grand challenges society faces compel strategy and organization scholars to engage meaningfully with practice and contribute towards solution development. As global complexities escalate, the importance of addressing these challenges intensifies. While the notion of ‘impact’ in organization theory remains elusive, a recent surge in scholarly work highlights the tensions and challenges associated with conducting impact-driven research. In this essay, we reflect on our 15-year program of research into financial responses to disasters, illustrating the process of doing impact through activities of ‘translating, ‘co-creating’, and ‘performing’. We show how these activities fostered the emergence of new research questions, new collaborations, and novel impacts. Based on our journey, we generate four reflexive insights. Firstly, translating, co-creating, and performing are an iterative, rather than sequential, process in which these activities partly overlap and build cumulatively on each other. Secondly, a flexible yet robust impact object is crucial. Thirdly, while co-creation is indispensable, it is also, often, contentious. Lastly, impactful research necessitates humility, courage, and persistence

    Delivering impact via the ebb-and-flow of a research team: reflection on a long-term program of research into a global societal challenge*

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    In this paper, we draw insights from a 15-year qualitative research program exploring catastrophe insurance and gaps in insurance protection as risks escalate within a world impacted by a climate emergency. We suggest that the ebb-and-flow of our research team's composition and activities through time was inextricably linked with our ability to have a sustained impact on such a large-scale societal issue. The essay situates itself within the research impact and team literature, narrates the trajectory of our research program and team development, and develops a framework for effectively managing impact-oriented qualitative research teams over time. Our framework illustrates key aspects of this process including team (re)forming, building team and individual stickability, performing, and managing team flux. We also present 10 practical takeaways for how these aspects can be managed effectively to produce long-term impact work to address grand challenges

    Effect of guar gum on the physicochemical, thermal, rheological and textural properties of green edam cheese

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    In attempts to produce a low-fat cheese with a rheology and texture similar to that of a full-fat cheese, guar gum (within 0.0025–0.01%; w/v, final concentration) was added to low-fat milk. The obtained cheeses were characterised regarding their physicochemical, thermal, rheological and textural properties. Control cheeses were also produced with low and full-fat milk. The physicochemical properties of the guar gum modified cheeses were similar to those of the low-fat control. No significant differences were detected in the thermal properties (concerning the enthalpy and profile of water desorption) among all types of cheeses. The rheological behaviour of the 0.0025% modified cheese was very similar to the full-fat control. Overall, no trend was observed in the texture profile (hardness, cohesiveness, gumminess and elasticity) of the modified cheeses versus guar gum concentration, as well as in comparison with the control groups, suggesting that none of the studied polysaccharide concentrations simulated the textural functions of fat in Edam cheese

    Aqueous Solution Preparation, Structure, and Magnetic Properties of Nano-Granular ZnxFe3−xO4 Ferrite Films

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    This paper reports a simple and novel process for preparing nano-granular ZnxFe3−xO4 ferrite films (0 ≤ x ≤ 0.99) on Ag-coated glass substrates in DMAB-Fe(NO3)3-Zn(NO3)2 solutions. The deposition process may be applied in preparing other cations-doped spinel ferrite films. The Zn content x in the ZnxFe3−xO4 films depends linearly on the Zn2+ ion concentration ranging from 0.0 to 1.0 mM in the aqueous solutions. With x increasing from 0 to 0.99, the lattice constant increases from 0.8399 to 0.8464 nm; and the microstructure of the films changes from the non-uniform nano-granules to the fine and uniform nano-granules of 50–60 nm in size. The saturation magnetization of the films first increases from 75 emu/g to the maximum 108 emu/g with x increasing from 0 to 0.33 and then decreases monotonously to 5 emu/g with x increasing from 0.33 to 0.99. Meanwhile, the coercive force decreases monotonously from 116 to 13 Oe
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