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3D-ICE 4.0: Accurate and efficient thermal modeling for 2.5D/3D heterogeneous chiplet systems
No full textThe increasing power densities and intricate heat dissipation paths in advanced 2.5D/3D chiplet systems necessitate thermal modeling frameworks that deliver detailed thermal maps with high computational efficiency. Traditional compact thermal models (CTMs) often struggle to scale with the complexity and heterogeneity of modern architectures. This work introduces 3D-ICE 4.0, designed for heterogeneous chip-based systems. Key innovations include: (i) preservation of material heterogeneity and anisotropy directly from industrial layouts, integrated with OpenMP and SuperLU MT-based parallel solvers for scalable performance, (ii) adaptive vertical layer partitioning to accurately model vertical heat conduction, and (iii) temperature-aware nonuniform grid generation. The results with different benchmarks demonstrate that 3D-ICE 4.0 achieves speedups ranging from 3.61×-6.46× over state-of-the-art tools, while reducing grid complexity by more than 23.3% without compromising accuracy. Compared to the commercial software COMSOL, 3D-ICE 4.0 effectively captures both lateral and vertical heat flows, validating its precision and robustness. These advances demonstrate that 3D-ICE 4.0 is an efficient solution for thermal modeling in emerging heterogeneous 2.5D/3D integrated systems.ES
Lightning Nowcasting Using Solely Lightning Data
No full textLightning is directly or indirectly responsible for significant human casualties and property damage worldwide. A timely prediction of its occurrence can enable authorities and the public to take necessary precautionary actions resulting in diminishing the potential hazards caused by lightning. In this paper, based on the assumption that atmospheric phenomena behave in a continuous manner, we present a model based on residual U-nets where the network architecture leverages this inductive bias by combining information passing directly from the input to the output with the necessary required changes to the former, predicted by a neural network. Our model is trained solely on lightning data from geostationary weather satellites and can be used to predict the occurrence of future lightning. Our model has the advantage of not relying on numerical weather models, which are inherently slow due to their sequential nature, enabling it to be used for near-future prediction (nowcasting). Moreover, our model has similar performance compared to other machine learning based lightning predictors in the literature while using significantly less amount of data for training, limited to lightning data. Our model, which is trained for four different lead times of 15, 30, 45, and 60 min, outperforms the traditional persistence baseline by 4%, 12%, and 22% for lead times of 30, 45, and 60 min, respectively, and has comparable accuracy for 15 min lead time.EM
Short homology bases for hyperelliptic hyperbolic surfaces
No full textGiven a hyperelliptic hyperbolic surface S of genus g >= 2, we find bounds on the lengths of homologically independent loops on S. As a consequence, we show that for any lambda is an element of (0, 1) there exists a constant N(lambda) such that every such surface has at least [lambda center dot 2/3 g] homologically independent loops of length at most N(lambda), extending the result in [Mu] and [BPS]. This allows us to extend the constant upper bound obtained in [Mu] on the minimal length of non-zero period lattice vectors of hyperelliptic Riemann surfaces to almost 2/3 g linearly independent vectors.GEO
Transient absorptions due to mixed valence species in the excited state absorption spectra of cyano-bridged trinuclear polypyridyl complexes of ruthenium(II)
No full textLP
Formation of Active Sites for Selective Toluene Oxidation during Catalyst Synthesis via Solid-State Reaction of V2O5 with TiO2
No full textInteraction of V2O5 with TiO2 during prepn. of V/Ti-oxide catalysts via solid-state reaction was studied using in situ FT-Raman spectroscopy, HRTEM and XPS. This interaction results in the formation of monomeric vanadia species with vanadium in tetrahedral coordination. The bridging O in the V-O-Ti bond is responsible for the catalytic activity during the partial oxidn. of toluene. The formation of the monomeric vanadia species correlates with the improved catalyst performance, characterized by reaction rate and selectivity to benzaldehyde and benzoic acid. Mech. activation by intensive grinding of V2O5/TiO2 mixt. via ball milling was necessary for the interaction of the oxides during calcination. The monomeric species formation was obsd. at temps. as low as 523 K. The dynamics of V2O5/TiO2 interaction strongly depends on the presence of moisture during the calcination. (c) 2000 Academic Press. [on SciFinder (R)]LGRCCAN 133:194923 45-4 Industrial Organic Chemicals, Leather, Fats, and Waxes Institute of Chemical Engineering,Swiss Federal Institute of Technology,Lausanne,Switz. Journal 0021-9517 written in English. 1314-62-1 (Vanadia); 13463-67-7 (Titania) Role: CAT (Catalyst use), USES (Uses) (formation of active sites during calcination of V2O5/TiO2 catalysts for selective oxidn. of toluene to benzaldehyde and benzoic acid); 65-85-0P (Benzoic acid); 100-52-7P (Benzaldehyde) Role: IMF (Industrial manufacture), PREP (Preparation) (formation of active sites during calcination of V2O5/TiO2 catalysts for selective oxidn. of toluene to benzaldehyde and benzoic acid); 108-88-3 (Toluene) Role: RCT (Reactant), RACT (Reactant or reagent) (formation of active sites during calcination of V2O5/TiO2 catalysts for selective oxidn. of toluene to benzaldehyde and benzoic acid
Device for measuring instantaneous sprint velocity
No full textThe invention concerns a device for measuring instantaneous sprint velocity, said device consisting of at least one position and/or one velocity sensor and one IMU sensor that respectively provide position and/or velocity and acceleration signals and wherein said signals are fused. The invention also concerns a method for measuring instantaneous sprint velocity comprising the use of at least one position and/or one velocity sensor and one IMU sensor that respectively provide position and/or velocity and acceleration signals and wherein said signals are fused.AVP-R-TTOLMAMAlternative title(s) : (fr) Dispositif de mesure de vitesse instantanée de sprin
