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Engineering Physics

6
Open Unknowns
0
Cross-Domain Bridges
7
Active Hypotheses

Open Unknowns (6)

Unknown What is the physical lower bound on contact resistance for 2D material (MoS₂, WSe₂) field-effect transistors, and can semimetal contacts (Bi, In) or phase- engineered metallic contacts achieve contact resistivity below the IRDS target of 10 Ω·µm to enable competitive ON-current for sub-1nm node devices? u-2d-material-fet-contact-resistance-scaling-below-1nm
Unknown Can H∞-optimal robust control be extended to nonlinear systems with guaranteed computational tractability — specifically, can sum-of-squares (SOS) or neural-network- based Lyapunov function approximations provide scalable robust stability certificates beyond the linear matrix inequality framework? u-h-infinity-nonlinear-systems-computational-tractability
Unknown What are the physical limits to heat pipe miniaturization for sub-millimeter electronics cooling, and can vapor chamber technology be extended to chip-scale integration? u-heat-pipe-limit-miniaturization
Unknown What is the complete physical mechanism by which edge transport barriers (H-mode pedestal) spontaneously form in tokamaks — specifically, what drives the L-H transition and sustains the pedestal pressure gradient — and can this mechanism be predictively modelled for ITER-scale plasmas? u-plasma-turbulence-transport-barrier-formation-mechanism
Unknown Can a universal roughness function map measured micron-scale topography to u_τ shifts without full DNS for engineering tolerances? u-skin-friction-scaling-across-roughness-regimes
Unknown Whether resonant wireless power transfer at MHz frequencies interacts with biological tissue in ways that limit safe power delivery to implanted medical devices, and what the fundamental safety-efficiency trade-off is for in-body WPT u-wpt-efficiency-biological-tissue-interaction

Active Hypotheses

Hypothesis Gate-all-around nanosheet silicon transistors at the 3nm node (Samsung/TSMC, 2022-2024) operate in the quasi-ballistic transport regime at room temperature (backscattering ratio r < 0.3), and their ON-current is within a factor of 2 of the Landauer ballistic limit — making further ON-current improvement require materials changes (SiGe, III-V), not gate geometry improvements. high
Hypothesis ITER will achieve Q ≥ 10 (500 MW fusion from 50 MW heating) in its DT burning plasma phase, and the confinement, stability, and plasma-facing material performance will be sufficient to demonstrate the physics basis for a DEMO commercial fusion plant with Q ≥ 25. high
Hypothesis For systematically generated anisotropic rough surfaces in channel flow, a single additional tensorial roughness parameter beyond k_s will reduce scatter in inferred u_τ by >30% versus scalar k_s alone. medium
Hypothesis Microencapsulated phase-change materials integrated into chiplet packaging layers can buffer transient thermal spikes exceeding 5× steady-state power by absorbing latent heat, reducing peak junction temperature by >15°C without increasing steady-state thermal resistance medium
Hypothesis Dynamic wireless power transfer (DWPT) for electric vehicles — resonant inductive charging embedded in road surfaces — is technically feasible at >85% efficiency for vehicles travelling at highway speeds, and would eliminate range anxiety if deployed on 10–20% of highway lane-kilometres high
Hypothesis Neural network Lyapunov certificates trained with incremental quadratic constraint (IQC) multipliers provide H∞ stability bounds for nonlinear dynamical systems of dimension n ≤ 100 with structured uncertainty, achieving within 15% of SOS-optimal γ while requiring 1000× less computation — enabling real-time certified-safe autonomous vehicle controllers. medium
Hypothesis Thermoacoustic travelling-wave engines (Stirling-cycle topology) can approach Carnot efficiency more closely than standing-wave engines because their piston displacement is in-phase with pressure oscillation throughout the regenerator, minimising irreversible heat transfer and approaching the ideal regenerator limit. medium

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Generated 2026-05-10 · USDR Dashboard