Experimental validation of XPM mitigation using a generalizable multi-task learning neural network.

We address the development of efficient neural network (NN)-based post-equalizers in long-haul coherent-detection dense wavelength-division multiplexing (DWDM) optical transmission systems. To achieve a high level of generalization of the NN-based equalizers, we propose to employ multi-task learning (MTL). MTL refers to a single shared machine learning (NN) model that can perform multiple different (albeit related) tasks.

L-tyrosine methyl ester hydrochloride crystal under high pressure and DFT calculations.

The methylated organic salt L-tyrosine methyl ester hydrochloride (LTMEHCl) crystal was synthesized by the slow solvent evaporation method. The crystal structure was verified through Powder X-ray Diffraction. Three-dimensional periodic Density Functional Theory calculations (DFT) were conducted to identify the Raman active modes.

Quick action required: revealing pheochromocytoma as the hidden trigger behind postoperative hypertensive crisis.

Managing patients who present with elevated blood pressure (BP) requires careful but expeditious assessment and triage to differentiate between those at immediate risk of complications and those for whom BP elevation does not pose an immediate threat to health. We present a case of a 54-year-old healthy male patient who experienced refractory hypertension during the immediate postoperative period following nasal surgery. Additional gastrointestinal symptoms and imaging findings made it possible to consider a catecholamine-producing tumour as the primary cause.

Phase-transition of hydrophobic dipeptide l-phenylalanyl-l-alanine under high pressure via Raman spectroscopy.

The study conducted on l-Phenylalanyl-l-Alanine (CHNO) dehydrated crystals under high-pressure conditions up to 7.0 GPa using Raman spectroscopy revealed significant modifications in both lattice and internal modes. Particularly, alterations were observed in modes associated with carbonyl and NH functionalities around 1600 cm.