The battery internal resistance as an important indicator of the battery reliability, has been recognized by the experts. Battery back-up power is essential for the safety of the entire power system. Size for accurate measurement of VRLA ( Valve-Regulated Lead Acid ) battery internal resistance enhanced VRLA battery as a backup power supply reliability article introduces the instrument based on the AD630 precision battery internal resistance measurement through the 4-wire exchange method. Resistance test for two groups of VRLA batteries is to prove its feasibility.This will be an effective alternative to the waste of energy and non-line measurement equipment.

Covalent organic framework (COF)-TpBD was grafted on the arrayed nanopores of stainless steel fiber (SSF) with (3-aminopropyl) triethoxysilane as the cross-linking agent. The prepared SSF bonded with COF-TpBD showed high thermal and chemical stability and excellent repeatability. The prepared SSF bonded with COF-TpBD was also used for the solid-phase microextraction (SPME) of seven kinds of polycyclic aromatic hydrocarbons (PAHs) in actual water samples, followed by gas chromatography with flame ionization detection (GC-FID) determination, which exhibited low limits of detection (LODs), good relative standard deviation (RSD) and high recoveries.

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