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Low-level helicopter flights have higher fatality proportion in Part 91 operations
Analysis of 403 US helicopter low-level flight accidents reveals Part 91 operations have 30% fatal accident rates versus 12% for Part 137, suggesting operational context impacts safety more than.
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Coupled finite element method simulates freeze-induced crack propagation
A coupled computational method for simulating ice-induced fracturing in rock masses, validated against freezing experiments and applied to slope stability in permafrost regions.
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Ultrathin chiral nanosheets improved gas chromatography separations
Ultrathin 2D nanosheets from exfoliated chiral ionic organic crystals enable high-resolution gas chromatography with exceptional enantioselectivity for pharmaceutical compound separation.