Tallinn University of Technology

Self-organizing map–derived regimes as a basis for basin-integrated diagnostics of Baltic Sea hydrographic change (1993–2023)

Abstract The Baltic Sea has experienced significant hydrographic changes over the past three decades, including long-term warming, increasing salinity, and intensified vertical stratification. While these trends are well established, their internal structure and temporal evolutio...

Mapping Boundary Conditions and Bottlenecks of Learning Analytics Dashboard Acceptance: A Cross-Group and Cross-Design Comparison

Drawing on extended Technology Acceptance Model, this study argues that learner's Learning Analytics Dashboards (LADs) data literacy and LAD cognitive complexity are boundary conditions that shape learner LAD acceptance. Two learner groups, one with LAD data literacy and another...

High current speed events in a harbor channel driven by resonant sub-hourly sea level dynamics: an example from Varna, Black Sea

Abstract. Current and sea-level observations in the 2.4-km-long, 300-m-wide channel between Varna Lake and the Black Sea, conducted by three novel Hydromast stations with a 1-minute resolution, revealed that moderate sub-hourly dynamics were occasionally interrupted by high-ampli...

Misquoted No More: Securely Extracting F* Programs with IO

Shallow embeddings that use monads to represent effects are popular in proof-oriented languages because they are convenient for formal verification. Once shallowly embedded programs are verified, they are often extracted to mainstream languages like OCaml or C and linked into lar...

Photovoltaic systems in the Nordics: A systematic review of techno-economic and life-cycle sustainability assessments

The rapid global deployment of photovoltaic (PV) technologies has increased the need for comprehensive evaluations of their technical performance, economic viability, and environmental compatibility. At high-latitudes, these assessments are essential due to low solar elevation an...

Fatty Acid-Based(Deep) Eutectic Solvents ThermodynamicBehavior and Thermal Properties for Low-Temperature Thermal EnergyStorage

Abstract The mismatch between heat supply and heat demand can be resolved by better utilization of low temperature waste heat with the help of low-temperature thermal energy storage (TES). In this work, binary mixtures of thymol (THY) with decanoic acid (C10), undecanoic acid (C1...

Thermal activation and pozzolanic reactivity assessments of Estonian clays for cementitious applications

Abstract This study evaluates the pozzolanic reactivity of locally sourced Estonian clays as supplementary cementitious material (SCM) alternatives. Two selected clays, Arumetsa (ARC) and Aseri (ASC), were calcined in a rotary tube furnace at three distinct temperatures (750 °C,...