Association between sleep disorders and constipation Risk: A systematic review and Meta-Analysis.

Objectives: The objective of this study was to evaluate the potential relationship between sleep disturbances and various types of constipation in patients.

Methods: We conducted systematic searches in the research databases PubMed, EMBASE, Web of Science, and Cochrane Library to identify qualifying studies. Using Stata software version 14.

Design and Analysis of a Pneumatic Spring Testing System for Precision Manufacturing.

The vibration isolation effect of the pneumatic spring determines the precision of the manufacturing. In this paper, in order to detect the performance of a pneumatic spring, a multi frequency band testing system with different payload is designed and developed. First, the pneumatic spring structure is analyzed, and the stiffness of the pneumatic spring is obtained based on the ideal gas model, Kelvin-Voigt model, and finite element method.

A novel inhibition mechanism of aniline on nitrification: Aniline degradation competes dissolved oxygen with nitrification.

Aniline is a toxic aromatic amine and an inhibitor of nitrification. This study explored the inhibition effect and underlying mechanism. After sludge acclimation, 540 mg/L aniline was removed in 24 h and almost all ammonia released from aniline was oxidized to nitrate.