DM3D Technology (United States)

• Evaluation of different supporting structures of the Lithium Quench Tank using thermal, mechanical, and modal finite element analysis. • Selection of the most suitable design taking into account the operating environment and maintenance needs. • Detailed thermo-mechanical analysis considering the most demanding operating modes. The IFMIF-DONES project aims to provide a neutron source that replicates the conditions expected in a fusion reactor, such as the future DEMO reactor. This facility will be utilized to test materials and conduct various scientific experiments. The selection process for materials involves rigorous testing and qualifying procedures to ensure their suitability. A high-power deuteron beam is used to create a neutron source by impinging on a liquid lithium-based target. In the Target Assembly (TAA), a free-surface high-speed lithium jet is generated under specific conditions to achieve the desired neutron flux for testing the materials. The lithium flow exiting from the TAA is collected in the Quench Tank (QT), which serves to reduce the flow velocity. After passing through the QT, the lithium is evacuated into the main lithium loop for further processing. To provide an updated design that takes into consideration the structural requirements and Remote Handling (RH) aspects a revision of the vessel's structure is needed. In this paper, a detailed analysis is performed to examine all the mechanical loads that occur during different operating conditions concerning the structural integrity of the Quench Tank.

Percutaneous renal biopsy is widely used for diagnosis, prognosis, and management of nephropathies. Early identication and embolization of the involved artery aids in effective management of the vascular complications and defers the need for nephrectomy. In this study, we aimed to evaluate various vascular injuries after renal biopsy requiring interventions. Pseudoaneurysm was the most common form of arterial injury. Target vessel was identied by angiography and successful embolization was done deferring nephrectomy. Deaths occurred due to haemorrhage.

Tibial malrotation can occur with medullary nailing of diaphyseal tibial fractures. Fibular alignment has been proposed as a surrogate for axial plane reduction intraoperatively. The purpose of this study was to determine whether fibular alignment is a reliable marker of accurate tibial rotation. Deidentified CT scans of 50 patients with normal tibial anatomy were selected. Using ImageJ software, we simulated osteotomies at three sites (proximal third, mid-diaphysis, and distal third). We overlaid adjacent CT slices and rotated them around the central axis of the tibia in 5° increments of external rotation (ER) and internal rotation (IR). At each increment, measurements of fibular overlap (%) were obtained from anteroposterior (AP) and lateral views. To simulate fixation of the fibula, we repeated rotation around the axis of the fibula with and without a simulated medullary implant in the tibia. A total of 50 patients were included. The mean age was 62 years, average BMI was 25.8, and 28 of 50 patients (56%) were male. Earliest loss of fibular contact occurred at 24° ER and 22° IR at the proximal site. Contact was lost at 26° ER and 28° IR on the AP view and 42° ER and 29° IR on the lateral view. The mean fibular contact at each 5° increment was similar for ER and IR. Fibular contact was reduced to 50% at 10 to 15° of rotation in ER and IR at all sites. Tibial canal contact was lost at 24° in both ER and IR around the fibula. With a virtual medullary implant, the mean maximal rotation was 6°. Surgeons should be aware that 20° or more of malrotation is likely present when fibular contact is lost during medullary nailing of the tibia. Greater than 50% loss of contact should raise suspicion for malrotation. A fixed fibula and medullary tibial implant theoretically preclude significant tibial malrotation.

The Apparel industry is moving into the 3D environment without the proper tools. The gaps include scan data models with fusing, or algorithmic assumptions that impact data quality, incomplete rigs for proper humanoid modeling, and lack of interoperability between CAD programs.

In recent years, the performances of face recognition have been improved significantly by using convolution neural networks (CNN) as the feature extractors. On the other hands, in order to avoid spreading COVID-19 virus, people would wear mask even when they want to pass the face recognition system. Thus, it is necessary to improve the performance of masked face recognition so that users could utilize face recognition methods more easily. In this paper, we propose a feature extraction backbone named ResSaNet that integrates CNN (especially Residual block) and Self-attention module into the same network. By capturing the local and global information of face area simultaneously, our proposed ResSaNet could achieve promising results on both masked and non-masked testing data.

There has been a pressing need for an expansion of the ventilator capacity in response to the recent COVID19 pandemic. To address this need, we present a system to enable rapid and efficacious splitting between two or more patients with varying lung compliances and tidal volume requirements. Reserved for dire situations, ventilator splitting is complex, and has been limited to patients with similar pulmonary compliances and tidal volume requirements. Here, we report a 3D printed ventilator splitter and resistor system (VSRS) that uses interchangeable airflow resistors to deliver optimal tidal volumes to patients with differing respiratory physiologies, thereby expanding the applicability of ventilator splitting to a larger patient pool. We demonstrate the capability of the VSRS using benchtop test lungs and standard-of-care ventilators, which produced data used to validate a complementary, patient-specific airflow computational model. The computational model allows clinicians to rapidly select optimal resistor sizes and predict delivered pressures and tidal volumes on-demand from different patient characteristics and ventilator settings. Due to the inherent need for rapid deployment, all simulations for the wide range of clinically-relevant patient characteristics and ventilator settings were pre-computed and compiled into an easy to use mobile app. As a result, over 200 million individual computational simulations were performed to maximize the number of scenarios for which the VSRS can provide assistance. The VSRS will help address the pressing need for increased ventilator capacity by allowing ventilator splitting to be used with patients with differing pulmonary physiologies and respiratory requirements, which will be particularly useful for developing countries and rural communities with a limited ventilator supply.

<div class="section abstract"><div class="htmlview paragraph">A ceramic bound matrix has been investigated to be used as a friction material. The materials were produced by means of ceramic technology using frits containing silicates, and ceramic friction modifiers such as tin oxide, zircon, iron oxide, magnesium oxide. Four formulations were tested by means of a tribometer (pin-on-disc tester) using a gray cast iron counterpart. Test section included speeds between 1 and 12 ms<sup>-1</sup>, and loads between 25 and 400 N. The coefficient of friction of the tested specimens were between 0.7 and 0.4, and exhibited sensitivity to speed at low loads (25 N), while they are quite stables at high loads (400N). The characterization of the tribolayers was carried out by means of scanning electron microscopy. The four developed materials were named A, B, C, and D. They exhibited different wear rates and coefficients of friction. All the materials exhibited sensitivity to speed, while showed a lower sensitivity to load. The coefficient of friction level seems to be suitable for brake applications, oscillating between 0.6 and 0.4, depending on the test section. This kind of materials with further efforts can be possibly useful in future electric vehicles that will not demand large and expensive brakes.</div></div>