The pathological diagnosis of gastric cancer relies on the precise differentiation of its fine-grained subtypes, a process often challenged by the lack of annotated data. This study proposes a novel dual-attention meta-learning framework, aiming to address the problem of fine-grained image classification under fee-shot conditions in the medical field, and is particularly suitable for histopathological images of gastric cancer. This study proposes a meta-learning method combined with a dual-attention mechanism to enhance the recognition of imperceptible inter-class differences in pathological images. The channel attention module automatically selects key features by analyzing the information density of the feature map, while the spatial attention module precisely locates the morphological structure in the image. Supported by the meta-learning framework, this model can quickly adapt to new disease classification tasks with a limited number of samples. Experimental results on a self-constructed pathological dataset containing multiple fine-grained subtypes of gastric cancer show that the proposed mean is significantly superior to several benchmark models, demonstrating obvious performance advantages. This work provides a new technical approach for developing computer-aided diagnostic systems in the absence of annotated data.

Transportation organizations face pressing issues due to the aging of road and bridge infrastructure, rising traffic demand, and tight resources. Manual inspection and reactive repair, which are frequently ineffective, expensive, and unreliable, are significant components of traditional maintenance. Therefore, a change to proactive, data-driven management is crucial. The Digital Twin, Building Information Modeling (BIM), Geographic Information System (GIS), and Internet of Things (IoT) are all integrated in this paper's proposed unified maintenance architecture. Data collection, semantic integration, analytical modules, and decision optimization make up the architecture's four tiers. Three functional modules in this system, automated defect detection, time-series performance prediction, and network-level risk assessment, cooperate to convert unprocessed data into insights that can be used. After that, a portfolio of potential treatments is assembled and assessed using economic and optimization analysis. The system is flexible and scalable, making it appropriate for both regional networks and single bridges. It gives agencies a workable option to transition from reactive repairs to preventive stewardship by integrating transparency and traceability. Throughout the whole life cycle of infrastructure assets, this proactive strategy lowers emergency interventions, improves safety, and increases cost-effectiveness.

The orbital change of the Hot Jupiter WASP-4b constitutes a difficult enigma for the theory of exoplanetary dynamics which are normally explained by tidal interactions with the host star; but here we consider an alternative explanation attributing the perturbation to the gravitational influence from an unseen third body. To test this hypothesis, a model was built and analyzed on the basis of the entire set of mass ephemerides with new modeling possibilities from the radial velocity (RV) datasets compiled by HARPS over several years. CORALIE and HIRES measurements together with a combination of Hubble Space Telescope observations and archival Kepler Transit Timing Variations results enable us to infer the existence of a hitherto unknown massive companion, having a 6.5 MJup mass, on a ~7.58 au orbit around WASP-4A, a B8V star slightly more luminous than the Sun. We establish a connection between such a massive companion and the observed orbital decay of WASP-4b; it is revealed through CORALIE and HIRES time-series that massive companions gravitationally perturb such systems, altering the expected period and causing apparent changes in their orbital timing, without tidal effects being involved.

Recent studies have found a negative correlation between atmospheric pressure and the muon flux measured by detectors. This study aims to present a correction method to reflect pressure-related variation. The different muon flux in diverse atmospheric backgrounds are used in the study to test the linear relationship between the changes in pressure at the detector site and the deviations in muon flux. The results show that as the pressure increases, the muon flux collected by multiple detectors decrease. These findings suggest that there is a need to find a correction method to reflect pressure-related variations, which contribute to researching the energy spectrum of cosmic rays, particularly in the regime of ultra–high energies.