C2F2NeUS: Cascade Cost Frustum Fusion for High Fidelity and Generalizable Neural Surface Reconstruction

There is an emerging effort to combine the two popular 3D frameworks using Multi-View Stereo (MVS) and Neural Implicit Surfaces (NIS) with a specific focus on the few-shot / sparse view setting. In this paper, we introduce a novel integration scheme that combines the multi-view stereo with neural signed distance function representations, which potentially overcomes the limitations of both methods. MVS uses per-view depth estimation and cross-view fusion to generate accurate surfaces, while NIS relies on a common coordinate volume. Based on this strategy, we propose to construct per-view cost frustum for finer geometry estimation, and then fuse cross-view frustums and estimate the implicit signed distance functions to tackle artifacts that are due to noise and holes in the produced surface reconstruction. We further apply a cascade frustum fusion strategy to effectively captures global-local information and structural consistency. Finally, we apply cascade sampling and a pseudo-geometric loss to foster stronger integration between the two architectures. Extensive experiments demonstrate that our method reconstructs robust surfaces and outperforms existing state-of-the-art methods.Comment: Accepted by ICCV202

Methods of improving rural water ecological environment and promoting the development of ecological economy from the perspective of the digital economy

With the liberation of productive forces and the rapid development of cities, the development of rural areas is very fast, and the pace of rural industrialization and urbanization is also accelerating. However, with the rapid development of the economy, the rural ecological environment has also been greatly affected. Based on the literature and field investigation, the paper made a thorough analysis of the water environment and pollution in rural areas and used the water environment-bearing capacity pressure model to analyze the current problems in rural areas. Economic development is at the cost of the ecological environment. The higher the level of economic development, the greater its impact on environmental carrying capacity. Based on the above analysis, this paper proposed rural water resources carrying capacity system based on ecological carrying capacity and organically combined it with the theory of system and ecological carrying capacity to evaluate it. According to the current situation of water pollution in rural areas, this article preliminarily discussed and put forward corresponding countermeasures. HIGHLIGHTS With the rapid development of the economy, the rural ecological environment has also been greatly affected.; Based on the literature and field investigation, this study conducts an in-depth analysis of the rural water environment and pollution conditions, and uses the water environment carrying capacity pressure model to analyze the current problems in rural areas.; This study proposes a rural water resource carrying capacity system based on ecological carrying capacity, and combines it with system theory and ecological carrying capacity to evaluate it.

Field-frequency lock approach for 21.3-MHz high-performance NMR relaxation analyzer

Low-field NMR (LF-NMR) relaxation analyzers have been more and more widely used in food science, biomedicine, and petroleum exploration in recent years. An LF-NMR device analyzes various interactions between sample molecules through spin relaxation, diffusion, flow, and imaging experiments. However, temporal field fluctuations in the magnet limit the scope of application. A stable magnetic field is the basic guarantee for detecting weak signals with shorter relaxation time. This paper presents an approach involving a field-frequency lock for a 21.3-MHz high-performance NMR bipolar permanent magnet. The diameter spherical volume (DSV) of the magnet is only 60 mm. The field-frequency lock system uses 19F in a micro coil integrated into the main probe as a lock detector. The required magnetic field compensation can be calculated from the lock free induction decay (FID) signal frequency, which is measured by lock spectroscopy. The compensation coils used to produce the magnetic field were designed based on Helmholtz coils. The system determines the signal frequency by detecting the lock FID signal and calculates the required compensation-coil current to stabilize the main magnetic field of the analyzer. The results of practical locking experiments in a 21.3-MHz high-performance NMR relaxation analyzer showed that this new approach helps to reduce magnetic field fluctuations from 11 ppm/3h (11 × 10–6) to 0.4 ppm/3h (0.4 × 10–6), which meets the application requirements. This approach is especially viable and effective for a permanent magnet with large field fluctuations. This paper also provides observations of the effect of these fluctuations on NMR measurements before and after installation of the field-frequency lock system

Data_Sheet_1_Characterization of the oral microbiome and gut microbiome of dental caries and extrinsic black stain in preschool children.PDF

IntroductionA lower prevalence of dental caries (hereafter termed “caries”) has been observed in children with dental extrinsic black stain (EBS).MethodsWe investigated the epidemiologic characterization of EBS and explored the possible role of the oral microbiome (OM) and gut microbiome (GM) in EBS formation and caries prevention. In an epidemiologic survey, 2,675 children aged 3–6 years were included. Thirty-eight of these children (7 children had both caries and EBS, 10 had EBS only, 11 had caries only, and 10 were healthy children) were recruited for 16S rRNA sequencing and collection of samples of supragingival plaque and feces. Collected plaque samples were divided into four groups: BCP (EBS+, caries+), BP (EBS+, caries−), CP (EBS−, caries+), and P (EBS−, caries−). Fecal samples were also divided into four groups: BCF (EBS+, caries+), BF (EBS+, caries−), CF (EBS−, caries+), and F (EBS−, caries−).ResultsEBS was observed in 12.10% of this population. Children with EBS had a significantly reduced prevalence of caries and a lower mean value of decayed–missing–filled teeth (dmft; p < 0.01). According to analyses of dental plaque, the P group had the most complex microbiome. The BCP group exhibited greater operational taxonomic unit (OTU) richness but a reduced evenness compared with the BP group, and the CP group showed greater OTU richness than the BP group. At the genus level, higher abundance of Actinomyces and Cardiobacterium species was observed in the BCP group. Higher abundance of Lautropia and Pesudopropionibacteriumin species was observed in the BP group compared with P and CP groups, respectively (p < 0.05). Veillonella species were significantly more common in P and CP groups than in BP groups, whereas Porphyromonas and Fusobacterium species were more common in the CP group (p < 0.05). With regard to the GM, the CF group exhibited greater OTU diversity than the BF group. The GM in the BCF group exhibited the most complex relationships across all fecal groups. GM groups could be distinguished by various unique biomarkers, such as Escherichia and Shigella species in the BCF group, Agathobacter and Ruminococcus species in the CF group, Lactobacillus species in the BF group, and Roseburia species in the F group. Our results suggest that EBS is a possible protective factor against early-childhood caries. Dental plaque and the GM may be relevant to EBS in primary dentition.</p