Improved T-shaped quartz tuning fork with isosceles-trapezoidal grooves optimized for quartz-enhanced photoacoustic spectroscopy.

The quartz tuning fork (QTF) being the acoustic-electrical conversion element for quartz-enhanced photoacoustic spectroscopy (QEPAS) system directly affects the detection sensitivity. However, the low electromechanical conversion efficiency characteristic of standard QTF limits the further enhancement of the system. Therefore, the optimized design for QTF is becoming an important approach to improve the performance of QEPAS.

Cognitive behavior stress management during pregnancy: a randomized controlled trial.

Background: Pregnancy stress could lead to adverse health outcomes for both mother and child. Few studies have explored the effectiveness of stress management strategy among pregnant women.

Objectives/aims/hypotheses: To examine the effectiveness of cognitive-behavioral stress management for pregnant women.