After detecting its porosity by different detecting methods,such as the density-analyzing method,the boring and sampling method,and the non-damage detecting method,all of which can help us comparatively accurately calculate its porosity,and the ultrasonic testing method,which can help us make a macro evaluation of its porosity.

The purpose was to study the best printing solid density on secondary fibers newspaper,to realize the control of the image reappearance quality and improve secondary fibers newspaper's performance.

The change of solid density before and after halt of printing was very large.

The relationship between ink thickness and solid density was established by experiment with four types of ink on different papers.

Preparation of boron carbide powders with high tap density;

Research progress of improving the rate capability and tap density of Li_4Ti_5O_(12);

Study of the preparation of ultrafine silver powders of high tap density;

By actual examples,the article introduces a new technology in situ measurement of the roadbed compaction density--the additional mass method,and introduces in detail its theory,method and technology,instruments and equipment and its testing results.

Evaluative targets for compacted density of sand layer and it testing methods & standards;

Influences of vibratory roller on density of pavement;

According this,it is given,the division limits of density and humidity of the silt soil.