Soraa (United States)

This paper validates a design support framework that integrates OpenVSP with an in-house panel method solver, UNLSI, to develop efficient transportation systems using unmanned aerial vehicles (UAVs). This framework utilizes OpenVSP for geometry definition and UNLSI for the analysis of aerodynamic characteristics. To verify the methodology of this approach, the analytical results were compared with those from an existing solver, and with data from wind tunnel experiments. The results demonstrated that the predictions from UNLSI were in good agreement with the wind tunnel test data. Furthermore, flight tests were conducted on the designed aircraft. The aircraft's performance was compared with the analytical results, based on the measured power consumption and assumed performance of the propulsion system.

We introduce a generalized Dual-Probe imaging system integrating in a unified platform both Infra-Red (IR) and Thermoreflectance (TR) lenses featuring coated-patterning. A dedicated, diffusion-aware, calibration-kit (CK) with a scalable array of resizable grid, seen as collectively interacting patterned unit-cells under random-field fluctuations, is introduced. Powered by an adaptive biasing DC supply, the CK module includes standard connectivity for easy interfacing through a simple command set, making it compatible with standard programming environments (e.g., Matlab, C, Python, Labview, and others). With PID control technology, it guarantees real-time temperature compensation as a function of airflow. The module also offers a user-friendly graphical interface to ensure an effortless setup process for facilitating a parametric AI-powered database creation and indexation for thermal-visual image identification and cross-correlations targeting advanced multi-physics characterization and industrial-testing applications. The proposed multi-probing system, referenced as “Cognitive-Lens”, integrates correlation-based signal processing powered by physics-informed AI algorithms for creating real-time instruments and tools applicable to noise and variation-aware on-the-move imaging applications. Perspectives are drawn for Multi-Scale and Super-Resolution technologies with sub-micron spatial resolution (beyond diffraction limit).

We will present recent findings on the physics of III-nitride recombinations, including the demonstration of defect-assisted Auger recombination as a significant droop process, and the intricacies of low-current radiative recombinations, where alloy disorder and Coulomb interaction play a key role. We will discuss implications for future LED applications, from long-wavelength devices to low-power micro-LEDs.

The physical process driving low-current non-radiative recombinations in high-quality III-nitride quantum wells is investigated. Lifetime measurements reveal that these recombinations scale with the overlap of the electron and hole wavefunctions and show a weak temperature dependence, in contrast to common empirical expectations for Shockley-Read-Hall recombinations. A model of field-assisted multiphonon point defect recombination in quantum wells is introduced and shown to quantitatively explain the data. This study clarifies how III-nitride LEDs can achieve high efficiency despite the presence of strong polarization fields.

Bulk GaN crystals were grown by the acidic ammonothermal method and doped with oxygen at concentrations ranging from 1.5 × 1018 to 2.7 × 1019 cm−3. VGa complexes were detected by Fourier transform infrared (FTIR) spectroscopy. Quantitative comparison with secondary ion mass spectrometry (SIMS) and Hall measurements provides the first experimental evidence for VGa–H–O complexes and shows that these complexes are the dominant compensatory defects, the population of which is controlled by the oxygen concentration. The energy level of these complexes was determined by correlating oxygen concentration with optical absorption and with sub-band-gap cathodoluminescence peaks. The effect of these complexes on device performance is discussed.

A novel, highly scalable apparatus has been employed to perform high temperature ammonothermal growth of (0001) GaN bulk crystals up to 52 mm in diameter and to a thickness of greater than 2 mm. X‐ray characterization of the crystals shows excellent crystallinity with radii of curvature > 20 m and a 201 rocking curve FWHM of <30 arcsec. Hall effect and optical absorption measurements performed on the crystal show a free carrier concentration of 1.1 × 1018 cm−3 and an absorption coefficient of 1 cm−1 at 450 nm and 2 cm−1 at 410 nm, meeting the substrate requirements for use as a native substrate in blue or violet LED devices. To the best of our knowledge, this is the lowest optical absorption coefficient reported for ammonothermally‐grown GaN having a carrier concentration above 1018 cm−3.

Using the MEM-net program to report on mapping the EchoColorDoppler assessment for chronic cerebro spinal venous insufficiency Sandro Mandolesi,1 Aldo d’Alessandro,2 Ettore Manconi,3 Tarcisio Niglio,4 Augusto Orsini,5 Dimitri Mandolesi,6 Alessandro d'Alessandro,7 Francesco Fedele1 1Department of Cardiovascular and Respiratory Sciences, Sapienza University Rome, Rome, Italy; 2Department of Angiology, “T Masselli-Mascia” Hospital, San Severo (FG), Foggia, Italy; 3Department of Cardiovascular and Neurological Sciences, University of Cagliari, Cagliari, Italy; 4Istituto Superiore di Sanità, Rome, Italy; 5Department of Vascular Surgery, “Gioia” Hospital, Sora (FR), Sora, Italy; 6Medicina del lavoro Sapienza University Roma, Rome, Italy; 7Faculty of Medicine, Catholic University “Our Lady of Good Counsel,” Tirana, Albania Introduction: Chronic cerebrospinal venous insufficiency (CCSVI) is characterized by multiple stenosis/obstructions affecting the principal extracranial outflow pathways of the cerebrospinal venous system. Using EchoColorDoppler (ECD) to assess chronic CCSVI is a very difficult and long examination. It takes about an hour even for an expert sonographer. Methods: Hemodynamic morphological map (MEM-Net) is a program that works on the Internet. All the morphological and hemodynamic data of the patient can be entered into the program’s anatomical scheme to create a map of the ECD report. The program also allows us to collect all the data during the ECD assessment and, using its algorithm, make the report uniform. Conclusion: Reporting on the map by using MEM-net shortens the time of ECD written reporting that is done automatically. The program also makes a blind control of the report and enables the use of it for scientific research. We hope that in the future everyone will use this data collection tool for all scientific work on this topic. Keywords: CCSVI, ECD, Map, cerebral venous system, sonography

We report recent advances in electrically controlled photonic crystal nanocavity light sources and modulators, including an electrically pumped laser with 181nA threshold, an ultrafast single-mode LED with sub-fJ/bit operation energy, and modulator with 0.2 fJ/bit modulation energy. Additionally, we model the electrical and thermal performance of the lateral p-i-n geometry utilized in these devices, determining design criteria for efficient electrical injection and finding minimal self-heating.

We characterized the DC transport response of a diode embedded in a THz quantum cascade laser as the laser current was changed. The overall response is described by parallel contributions from the rectification of the laser field due to the non-linearity of the diode I-V and from thermally activated transport. Sudden jumps in the diode response when the laser changes from single mode to multi-mode operation, with no corresponding jumps in output power, suggest that the coupling between the diode and laser field depends on the spatial distribution of internal fields. The results demonstrate conclusively that the internal laser field couples directly to the integrated diode.