We report epidemiological and clinical investigations on ten pediatric SARS-CoV-2 infection cases confirmed by real-time reverse transcription PCR assay of SARS-CoV-2 RNA. Symptoms in these cases ...were nonspecific and no children required respiratory support or intensive care. Chest X-rays lacked definite signs of pneumonia, a defining feature of the infection in adult cases. Notably, eight children persistently tested positive on rectal swabs even after nasopharyngeal testing was negative, raising the possibility of fecal-oral transmission.
Mesh surface denoising is a fundamental problem in geometry processing. The main challenge is to remove noise while preserving sharp features (such as edges and corners) and preventing generating ...false edges. We propose in this paper to combine total variation (TV) and piecewise constant function space for variational mesh denoising. We first give definitions of piecewise constant function spaces and associated operators. A variational mesh denoising method will then be presented by combining TV and piecewise constant function space. It is proved that, the solution of the variational problem (the key part of the method) is in some sense continuously dependent on its parameter, indicating that the solution is robust to small perturbations of this parameter. To solve the variational problem, we propose an efficient iterative algorithm (with an additional algorithmic parameter) based on variable splitting and augmented Lagrangian method, each step of which has closed form solution. Our denoising method is discussed and compared to several typical existing methods in various aspects. Experimental results show that our method outperforms all the compared methods for both CAD and non-CAD meshes at reasonable costs. It can preserve different levels of features well, and prevent generating false edges in most cases, even with the parameters evaluated by our estimation formulae.
Inherent defects such as ion migration, halide vacancies and ionic dangling bonds based on CsPbIxBr3−x devices are the main reasons for deep-level defects, non-radiative recombination and poor ...moisture resistance. Interface engineering has been proven to be the most direct and effective way to solve these problems. In this work, a PbS/CdS heterojunction thin layer between the CsPbI1.5Br1.5 and carbon electrode is constructed. The thin layer interacts with perovskite to reduce the trap density, inhibit carrier recombination, increase the built-in potential, inhibit ion migration and greatly improve the stability of the device. As a result, the carbon-based CsPbI1.5Br1.5 PSC achieves an open-circuit voltage of 1.315 V, a fill factor of 77.06% and a power conversion efficiency of 13.65%. As far as we know, this may be the highest efficiency reported for carbon-based CsPbI1.5Br1.5 PSCs so far. The optimized device can maintain more than 90% of the original efficiency and can be stored for 1200 h in atmospheric environment with relative humidity ≈ 30%. It can still retain 87% of the initial efficiency at temperature of 85 °C for 400 h in nitrogen environment. Our work provides a new optimization direction for the high-efficiency and stable all-inorganic PSCs.
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•PbS and CdS NCs are used to construct PbS/CdS heterojunction thin layers.•A champion CsPbI1.5Br1.5 PSC with PbS/CdS layer achieves a PCE of 13.65%.•The device with PbS/CdS layer shows good moisture and thermal stability.•This heterojunction strategy has good scalability for CsPbIxBr3−x family PSCs.
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High efficiency and stability have long been the key issues faced by perovskite solar cells (PSCs). It is found that the CsPbIBr2 all-inorganic perovskite has a suitable band gap and ...satisfactory stability, so it has attracted much attention. However, the many defects in the CsPbIBr2 film are one of the main problems hindering the improvement of power conversion efficiency (PCE) of the CsPbIBr2 PSCs. The substitution of trace impurities is undoubtedly a simple, cost-effective and efficient strategy. In this work, an appropriate amount of Cd2+ (1.0% mol of Pb2+) is added into the CsPbIBr2 precursor solution to fabricate high quality CsPbIBr2 film with improved crystallinity, reduced trap density, suppressed photo-generated carrier recombination, displayed n-type doping and optimized energy level alignment. The corresponding carbon-based all-inorganic Cd2+-doped CsPbIBr2 PSCs achieve a maximum PCE of 10.63% with a high open circuit voltage (VOC) of 1.324 V, which are much higher than those of the control one with a PCE of 8.48% and an VOC of 1.235 V. The unencapsulated device can still retain more than 92% of the initial PCE when stored at ambient atmosphere (25 °C, relative humidity about 30%) for 40 days.
Vision‐audio fusion SLAM in dynamic environments Zhang, Tianwei; Zhang, Huayan; Li, Xiaofei
CAAI Transactions on Intelligence Technology,
December 2023, 2023-12-00, 2023-12-01, Letnik:
8, Številka:
4
Journal Article
Recenzirano
Odprti dostop
Moving humans, agents, and subjects bring many challenges to robot self‐localisation and environment perception. To adapt to dynamic environments, SLAM researchers typically apply several deep ...learning image segmentation models to eliminate these moving obstacles. However, these moving obstacle segmentation methods cost too much computation resource for the onboard processing of mobile robots. In the current industrial environment, mobile robot collaboration scenario, the noise of mobile robots could be easily found by on‐board audio‐sensing processors and the direction of sound sources can be effectively acquired by sound source estimation algorithms, but the distance estimation of sound sources is difficult. However, in the field of visual perception, the 3D structure information of the scene is relatively easy to obtain, but the recognition and segmentation of moving objects is more difficult. To address these problems, a novel vision‐audio fusion method that combines sound source localisation methods with a visual SLAM scheme is proposed, thereby eliminating the effect of dynamic obstacles on multi‐agent systems. Several heterogeneous robots experiments in different dynamic scenes indicate very stable self‐localisation and environment reconstruction performance of our method.
Neonatal chylothorax (NCTx) and central lymphatic flow disorder (CLFD) are historically challenging neonatal disorders with high morbidity and mortality.
We conducted a retrospective study of 35 ...neonates with pulmonary lymphatic abnormalities at our institution who underwent lymphatic evaluation between December 2015 and September 2018. Patients with only pulmonary lymphatic perfusion syndrome were classified as NCTx and those with multiple flow abnormalities were classified as CLFD. Demographics, clinical characteristics, and outcomes were compared using t-tests/Wilcoxon rank sum tests and Fisher's exact tests.
All 35 patients had intranodal MR lymphangiography and 14 (40%) also had conventional fluoroscopic lymphangiography. Fifteen (42.8%) patients were diagnosed with NCTx and 20 (57.1%) were diagnosed with CLFD. Thirty-four (97.1%) patients had pleural effusions. None of the NCTx group had ascites, anasarca, or dermal backflow compared to 17 (85%) (p < 0.001), 8 (42.1%) (p: 0.004), and 20 (100%) (p < 0.001) of the CLFD group, respectively. In the NCTx group, 11 (73.3%) had ethiodized oil embolization and 4 (26.7%) received conservative therapy. Ten (50%) of the CLFD patients had an intervention; of those, two (10%) had ethiodized oil-only embolization. Eight had non-ethiodized oil embolizations (two (25%) had embolization with glue, three (37.5%) underwent surgical lymphovenous anastomosis, two (25%) underwent thoracic duct (TD) externalization, and one (12.5%) had a non-TD lymphatic channel drain placed). Complete resolution of pleural effusions was achieved in all 15 NCTx patients, whereas 9 (45%) of 20 CLFD patients had resolution of chylothorax (p: 0.001).
Establishing a diagnosis of NCTx or CLFD is paramount in selecting treatment options and providing prognostic information. Development of lymphatic interventions represents a paradigm shift in our understanding of neonatal lymphatic flow disorders and may be associated with improved survival.
Early detection of delay or impairment in motor function is important to guide clinical management and inform prognosis during a critical window for the development of motor control in children. The ...purpose of this study was to investigate the ability of biomechanical measures of early postural control to distinguish infants with future impairment in motor control from their typically developing peers.
We recorded postural control from infants lying in supine in several conditions. We compared various center of pressure metrics between infants grouped by birth status (preterm and full term) and by future motor outcome (impaired motor control and typical motor control).
One of the seven postural control metrics-path length-was consistently different between groups for both group classifications and for the majority of conditions.
Quantitative measures of early spontaneous infant movement may have promise to distinguish early in life between infants who are at risk for motor impairment or physical disability and those who will demonstrate typical motor control. Our observation that center of pressure path length may be a potential early marker of postural instability and motor control impairment needs further confirmation and further investigation to elucidate the responsible neuromotor mechanisms.
The key message of this article is that quantitative measures of infant postural control in supine may have promise to distinguish between infants who will demonstrate future motor impairment and those who will demonstrate typical motor control. One of seven postural control metrics-path length-was consistently different between groups. This metric may be an early marker of postural instability in infants at risk for physical disability.
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