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Senast publicerade
- Modelling Underwater Sound Propagation Using the Finite-Difference Time-Domain Method(2026) Cunningham, CallumMarine life in coastal regions is under environmental pressure from anthropogenic activities such as commercial shipping, offshore wind farms and leisure boats. As part of an ongoing research project to create underwater noise maps for recreational boats, IVL Swedish Environmental Research Institute has measured propagation loss in Kosterhavet marine protected area. These measurements show a variety of acoustic effects that are not captured by simple analytical models. The goal of this project is to produce a numerical model that can provide a more detailed understanding of how noise propagates underwater to the surrounding environment. A three-dimensional finite-difference time-domain (FDTD) model was developed in MATLAB. The model was validated by comparison to known analytical solutions of increasing complexity. First, it was confirmed that the model reproduces propagation loss due to spherical spreading, agreeing closely with analytical predictions. A nearly perfectly matched layer (NPML) was implemented to avoid unwanted reflections from the boundaries of a truncated domain. The decay factor and layer width were optimised empirically, achieving reduction of reflected wave energy up to 45 dB relative to a rigid boundary condition. Then, several boundary conditions were tested including a rigid wall boundary, a pressure-release condition and a finite-impedance boundary, with the latter two conditions representing the water-air interface and the water-seabed interface respectively. Analytical solutions for each case were calculated and show strong agreement with model output in both frequency and time domains. Finally, an attempt was made to reproduce real world measurements of propagation loss provided by IVL using different configurations of sea floor properties. Initial results show promise however require further investigation and fine-tuning of the model to accurately reproduce measurements.
- A High-Frequency Algorithm for Battery Storage Trading on Continuous Intraday Electricity Markets - Replication, Optimization, and Empirical Comparison of the Rolling-Intrinsic Policy Across Three European Intraday Markets(2026) Lindmark, Niclas; Hallström, KarlBattery storage earns revenue on continuous intraday electricity markets only with a trading policy that reoptimizes as the order book moves. This thesis replicates the rolling-intrinsic dynamic-programming (DP) policy of Schaurecker et al. and adapts it to Flower’s operational setting. Schaurecker et al. study hourly products on the German EPEX market. We move the rolling intrinsic to quarter-hour contracts and backtest it on roughly a year of Nord Pool order-book data in each of three bidding zones: Sweden SE3, Sweden SE4, and Germany Amprion. The quarterhour switch makes the DP backward pass roughly 64 times heavier than the hourly reference, because the number of stages, the action set, and the storage grid each grow fourfold. A C++/OpenMP kernel keeps event-resolution backtests tractable, reaching about 2.6 ms per re-solve on the SE3 benchmark. On a single 10 MWh, one-hour battery, re-solving on every order-book event earns roughly EUR 0.75M on Sweden SE3 and EUR 0.93M on Sweden SE4 over twelve-month windows, and EUR 1.08M on Germany Amprion over a longer fourteen-month window, and beats every fixed re-solve timeline tested in all three zones. Over the window common to all three zones, SE4 earns the most, ahead of Germany Amprion and then SE3; Germany’s larger raw total reflects only its longer window. Set against the dominant ancillary-market alternative, the rolling intrinsic earns more on only 8% of days in Sweden SE3, 4% in Sweden SE4, and 10% in Germany Amprion. It is therefore a conditional trading policy for the battery, chosen day by day against ancillary opportunities, rather than a default replacement for ancillary-market participation.
- Perovskite materials for hydrogen production(2026) Klute, Alexander
- Strategic Product Portfolio Management and Global Value Creation A Regulation Aware Governance Framework for Digital Platform Investment Portfolios Master's thesis in Management and Economics of Innovation(2026) Rajolli Channappa, Harish Patil; Siddalaingamurthy, VivekDigital platform holding companies create value through more than capital allocation and market selection. Their performance also depends on whether ownership can be translated into effective governance and whether shared technological capabilities can move lawfully across jurisdictions with different data protection and artificial intelligence regimes. This thesis examines Prosus N.V., a global consumer internet investor spanning food delivery, fintech, classifieds, ecommerce, and travel, as a single embedded case study. Using public corporate disclosures, regulatory instruments, and academic literature, it asks how Prosus selects and prioritises portfolio opportunities (RQ1), how ownership structures shape governance depth and value creation (RQ2), and how regulation and digital sovereignty affect the integration of AI, data, and platform capabilities (RQ3). The analysis finds that portfolio growth has been acquisition led and ecosystem oriented, while governance feasibility and regulatory exposure were historically underweighted at selection. Tencent serves as an external ecosystem and financial benchmark under minority influence, whereas iFood is a controlled operating platform. Governance depth tracks ownership position but is not determined by ownership alone. Byju's full write off followed interacting market, operating, financing, reporting, and governance failures. Prosus's minority position constrained monitoring and intervention but did not independently cause the collapse. Prosus's branded Large Commerce Model programme may create parenting advantage, although its architecture and portfolio wide performance effects are not established by public evidence. The thesis develops four regulation aware governance tools: a two stage legal admissibility gate followed by two datum sensitive Pugh runs; a Portfolio Balance Model separating legal ownership, functional role, and economic exposure; a tiered Lifecycle Governance Trigger Framework linked to observable events and feasible rights; and a Regulatory Exposure and Capability Governance Logic that selects centralised, modular or federated, locally autonomous, or ring fenced designs only after legality is established. These qualitative risk and diligence filters feed a formal merger and acquisition stage gate and financial underwriting process. They do not replace valuation, investment committee judgement, or transaction specific legal advice. Together they form a Three Dimensional Portfolio Governance Framework spanning commercial and technical, architectural, and sovereign and regulatory dimensions.
- FPGA-based platform architecture for a distributed MIMO (D-MIMO) 6G testbed(2026) Solak, ÖznurA distributed MIMO (D-MIMO) testbed changes shape as the experiments running on it change. On a conventional FPGA, replacing one accelerator means rebuilding and reprogramming the whole device, which takes the shared platform out of service for everybody. This thesis builds a Dynamic Function eXchange (DFX) platform for the ALINX Z19 board and its AMD Zynq UltraScale+ XCZU19EG, in which three regions of the fabric can be replaced independently while the rest of the design keeps running. The static design holds the processing system, the DDR and network paths, three AXI DMA engines, the DFX Controller and the ICAPE3 configuration primitive. Around it sit three reconfigurable partitions that share one boundary contract: a 100MHz clock, an active-low reset, a 32 bit control word, a 32 bit status word, a 32 bit AXI4-Stream port in each direction and a shutdown handshake. Because the three partitions present the same 146 pins, a module is written once; because they sit in different places on the die, it is built once per partition against that partition’s abstract shell. An accelerator developer therefore needs neither the parent project nor its bitstream: a routed shell, one 1.75MB checkpoint per partition, and their own VHDL are enough. A standalone application on the Cortex-A53 serves a browser console and an HTTP API over lwIP. Uploading a partial bitstream to a slot validates it against the device IDCODE and the partition’s own configuration frame address, hands the configuration port from PCAP to ICAPE3, and drives the virtual socket manager through shutdown, address programming, restart and trigger. The implemented design closes timing with +4.342 ns of setup slack against 10 ns period with no failing endpoints and no unrouted nets, and it occupies 2.31% of the device LUTs, 1.66% of its registers and 0.61% of its block RAM. It produced a 3.63 kB full bitstream and three partials of 2.59–3.19MB, whose sizes track partition geometry rather than module content. At the 96.97MHz PL clock recorded in the hardware handoff and the 32 bit ICAPE3 port, their ideal configuration-transfer times are 6.69–8.23ms against 93.70ms for the full image. Hardware validation exposed four problems not revealed by reports or simulation: ICAPE3 required software to transfer ownership of the configuration interface from PCAP; the unsupported Ethernet PHY required explicit RGMII skew programming; link speed had to be read after negotiation; and enabled but unused transceiver peripherals could stall processor initialisation and JTAG until the board was powercycled. After these corrections, the board boots unattended, answers ping in 110ms and reconfigures any partition over HTTP while the other two continue running. D-MIMO physical-layer accelerators remain future work.