Lorentz Integral Transform for Inclusive and Exclusive Cross Sections with the Lanczos Method

The Lorentz Integral Transform (LIT) method is reformulated via the Lanczos algorithm both for inclusive and exclusive reactions. The new technique is tested for the total photoabsorption cross section of 3H and 4He. Due to the rapid convergence of the algorithm one has a decrease in cpu time by two orders of magnitude, but at the same time an excellent agreement with the results of a conventional LIT calculation. The present work opens up the possibility of ab initio calculations for inclusive and exclusive processes for A greater equal 6 with inclusion of complete final state interactions.Comment: LaTeX, 13 pages, 3 ps figure

Total Photoabsorption Cross Sections of A=6 Nuclei with Complete Final State Interaction

The total photoabsorption cross sections of 6He and 6Li are calculated microscopically with full inclusion of the six-nucleon final state interaction using semirealistic nucleon-nucleon potentials. The Lorentz Integral Transform (LIT) method and the effective interaction approach for the hyperspherical formalism are employed. While 6Li has a single broad giant resonance peak, there are two well separated peaks for 6He corresponding to the breakup of the neutron halo and the alpha core, respectively. The comparison with the few available experimental data is discussed.Comment: LaTeX, 8 pages, 3 ps figure

Deep Learning-Driven Extraction of Superluminescent Diodes Parameters

We present a deep learning-based method for the automatic extraction of physical parameters from optical spectra and power values of a chirped, tapered, dual-section quantum dot superluminescent diode. The neural network is able to estimate a set of parameters that are capable of reproducing the behavior of the target device with high accuracy

PSO-assisted extraction of VCSEL parameters from L-I and S21 measurements

We propose a method based on Particle Swarm Optimization for the extraction of VCSELs rate-equation model parameters from experimental power and S21 measurements. The method is shown to reliably predict a set of parameters for accurate reproduction of the measured curves

WO3-Doped Indium Oxide Thick Films for Ozone Detection at Low Temperature

Ozone, a strong oxidizing gas, has dramatically increased its concentration in the troposphere during the last decades. Since high O3 concentrations are hazardous to human health, the development of effective methods and economic devices to detect this gas is an urgent need. In this frame, In2O3 is well known as an n-type ozone sensitive and selective material, generally displaying its optimal sensing capability in the temperature range 200–350 °C. To enhance the sensing capability of In2O3 and to decrease its operative temperature, in this work, commercial In2O3 powders were doped with 2.5 wt. % WO3. Pure and doped-In2O3 materials were used to develop sensing devices by screen-printing technology. Resistance measurements were performed in the temperature range 25 °C–150 °C under 200–500 ppb O3. Best results were obtained at 75 °C with sensor’s responses as high as 40 under 200 ppb of ozone

How to Process Sputum Samples and Extract Bacterial DNA for Microbiota Analysis

Different steps and conditions for DNA extraction for microbiota analysis in sputum have been reported in the literature. We aimed at testing both dithiothreitol (DTT) and enzymatic treatments of sputum samples and identifying the most suitable DNA extraction technique for the microbiota analysis of sputum. Sputum treatments with and without DTT were compared in terms of their median levels and the coefficient of variation between replicates of both DNA extraction yield and real-time PCR for the 16S rRNA gene. Treatments with and without lysozyme and lysostaphin were compared in terms of their median levels of real-time PCR for S. aureus. Two enzyme-based and three beads-based techniques for DNA extraction were compared in terms of their DNA extraction yield, real-time PCR for the 16S rRNA gene and microbiota analysis. DTT treatment decreased the coefficient of variation between replicates of both DNA extraction yield and real-time PCR. Lysostaphin (either 0.18 or 0.36 mg/mL) and lysozyme treatments increased S. aureus detection. One enzyme-based kit offered the highest DNA yield and 16S rRNA gene real-time PCR with no significant differences in terms of alpha-diversity indexes. A condition using both DTT and lysostaphin/lysozyme treatments along with an enzymatic kit seems to be preferred for the microbiota analysis of sputum samples

Wideband operation of 3x3 Mach-Zehnder Interferometer mesh for programmable photonic computing

This work demonstrates the wideband performances of a 3-by-3 Mach-Zehnder Interferometer (MZI) mesh used as a programmable photonic logic gate. A digital twin of the device is created by fitting experimental data with a comprehensive circuit model that includes thermal effects. This model is used to identify voltage configurations to implement 15 user-defined Boolean functions at 1550 nm. These configurations are then tested across a large wavelength range (1524 nm – 1568 nm), which includes the entire C-band. Most test functions maintain correct operation across this range, with minor exceptions due to output connection issues. The results indicate a strong potential for wavelength division multiplexing (WDM) to perform multiple logic operations in parallel, boosting computational capabilities. The digital twin allows rapid testing and prototyping of photonic integrated circuits (PICs), supporting their use in photonic computing and AI hardwar

Investigation on digital twin model of 3x3 Mach-Zehnder Interferometer mesh

A physics-based digital twin model of a 3-by-3 Mach-Zehnder Interferometer (MZI) mesh is established by interpolating the experimental data with an accurate mathe- matical representation, then utilized to investigate the wideband capabilities of the device to implement programmable logic functions. Most of the evaluated functions perform correctly over a broad wavelength range (1524 nm – 1568 nm) under the voltage configuration determined at 1550 nm. The findings showcase the potential of digital twin model in Photonic Integrated Circuit (PIC) design, allowing novel designs in photonic computing and telecommunication applications

Comprehensive thermal crosstalk model of meshed MZI topologies for neuromorphic computing

We propose a comprehensive Mach-Zehnder Interferometer (MZI) model that takes into account propagation effects, losses, thermal and optical crosstalk, and can be used to simulate the behavior of meshed MZI topologies (e.g., in the context of neuromorphic photonic computing). The model is validated by comparing the simulated results with power and spectral measurements of a 3x3 Silicon Photonic circuit based on cascaded MZIs. This circuit can be used as a programmable logic gate and this application is demonstrated with the proposed mod