Following the delineation and development of a field, the recovery of oil by cyclic steam stimulation and other thermal methods is controlled by actions taken at the surface. A number of operational variables effect t...
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Massive integration of inverter-based generation (IBG) has begun to displace conventional generation units. This type of generation does not provide support for frequency deviations, causing stability problems in weak...
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ISBN:
(纸本)9781665458931
Massive integration of inverter-based generation (IBG) has begun to displace conventional generation units. This type of generation does not provide support for frequency deviations, causing stability problems in weak power systems. In-verter control methods have emerged to extend IBG integration. Grid-forming control is a promising emerging technology that generates its own voltage signal and can regulate the frequency and voltage at the point of common coupling. The transition to a grid with very low or no inertia makes frequency regulation a challenge; nevertheless, grid forming technology makes it possible, besides being able to restore a power system from blackstart. Currently, conventional generation in hydroelectric and thermal power plants maintains a certain system stability; however, understanding what happens when moving towards an IBG-dominated grid is crucial in order to develop technologies that mitigate the shortcomings and enable a smooth transition. This changing grid landscape creates a wide range of challenges for system modeling, planning, stability and control. As an emerging technology, there is a lack of documentation and well-established generic models that can be used for testing. This paper presents the main theory and detailed mathematical modeling of a three-phase inverter, with emphasis on the control design and the capability to provide frequency support.
The number of mitotic figures per tumor area observed in hematoxylin and eosin (H and E) histological tissue sections under light microscopy is an important biomarker for breast cancer prognosis. Whole-slide imaging a...
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Many real-time systems run in dynamic environments where exogenous factors inform task workloads and deadlines, which may not be known prior to job release. A job of a task that would otherwise miss its deadline may a...
Many real-time systems run in dynamic environments where exogenous factors inform task workloads and deadlines, which may not be known prior to job release. A job of a task that would otherwise miss its deadline may adapt to remain schedulable by executing in a degraded state that reduces its workload. We suggest that such a task should adjust parameters of its computation over multiple dimensions to maintain schedulability while minimizing loss of utility, which we discuss for highly parallel fork-join tasks executing on a fixed number of dedicated processors. We identify the parameterized degrees of freedom over which workload can be adjusted, then characterize the impact of workload reduction on response time and utility. From this, we generate a Pareto-optimal surface over which efficient search, interpolation, and extrapolation enable online selection of task parameters at time of job release. We apply this approach to the Advanced Particle-astrophysics Telescope, a planned mission to perform real-time gamma-ray burst (GRB) localization using SWaP-constrained embedded hardware aboard an orbiting platform. Due to GRBs' dynamic and uncertain nature, the workload and deadline may not be known prior to job release. Nonetheless, even for bright GRBs that may otherwise take longer than a second to localize on candidate embedded hardware, our approach often enables sub-degree accuracy while meeting a 33 ms imposed deadline.
In this paper, we propose a novel top-down design method for the development of collective behaviors of swarm robotics systems called property-driven design. Swarm robotics systems are usually designed and developed u...
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Oxime and oxime ethers have attracted much interest due to their chemical properties and biological *** oximes and their derivatives are known to exhibit anti-inflammatory,anticancer and other pharmacological *** was ...
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Oxime and oxime ethers have attracted much interest due to their chemical properties and biological *** oximes and their derivatives are known to exhibit anti-inflammatory,anticancer and other pharmacological *** was reported that strophathidin 19-aldoxime had a biological activity three times greater than that of the natural cardiac *** has a relatively different structure compared with
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