Lihui Yin

Abstract Concrete components in highways and bridges are susceptible to freeze–thaw deterioration in cold regions, compromising their service safety. Alkali-activated fly ash-slag concrete (AAFSC), which fully replaces Portland cement with industrial by-products, offers promising environmental and application benefits. However, research on its freeze–thaw damage remains limited, hindering its use in cold-region infrastructure.

Introduction Syphilis, caused by the spirochete Treponema pallidum, remains a substantial global health burden with an estimated 7.1 million annual incident cases (1). Despite antibiotic availability, its tertiary-stage complications, particularly cardiovascular manifestations, continue to pose significant diagnostic challenges. Cardiovascular involvement is a classic late manifestation that typically occurs 10–30 years after infection.

Rapid screening pharmaceutical products for elemental impurities by high-resolution portable energy dispersive X-ray fluorescence spectrometer using efficient fundamental parameter method Li Zhu, Yun Teng, Weidan Han, Lihui Yin and Xu Teng Abstract In this study, a rapid screening method of elemental impurities in pharmaceutical products has been established by the portable energy dispersive X-ray fluorescence (EDXRF) spectra combined with the efficient fundamental parameter method.