Respirator filter efficiency tester and testing principle;

Serial data processing system for respirator filter efficiency tester

According to the blocking effect of the "cover",urban eco-geochemistry evaluation concerns three parts:circulation of chemical elements or compounds on the cover,circulation of chemical elements or compounds below the cover (or in the soil reservoir),and open circulation of chemical elements or compounds between the cover surface and the soil reservoir through the cra.

The blocking effect caused by focal information between lian(连) and dou(都) provides further evidence for the focus analysis of lian(连) construction.

3D dynamic finite element model was established to analyse the dynamic transfer characteristics of the floating slab track(FST)system and to study the vibration isolation efficiency and dynamic transfer characteristics of the track structure with different design parameters and under different exiting frequencies.

An introduction to the vibration isolating design and check calculation of the spring supported foundation of Tianwan Nuclear Power Plant s turbine-generator set is being presented,together with a substantiation of relevant design parameters,such as the vibration isolation efficiency.

In this paper vibration isolation efficiency is studied when the base situations are fixed rigid body, suspended rigid body and floated rigid body respectively, influences on vibration isolation efficiency are presented as well.

Model for separating efficiency assessment of separator devices rigged in multi-level beam trawls