This paper took membrane pore density and membrane pore size of UF membrane as membrane structure parameters, adopted a field emission scanning electron microscope (FESEM) to examine membrane structure parameters.

Although the average cell size was small and cell density was.

Extruded polypropylene foam with low open cell content, high cell density, small and uniform cell size was prepared via blending conventional linear polypropylene with a small amount of high melt strength polypropylene (HMSPP).

The cell size of the composite materials was 10 μm,the cell density was 4.

Influence Ceramic Foam Filter (CFF) with Different Hole Density of on Structures and Properties of ZL204A;

The lipid contents,specific surface areas and stomata density of two kinds of pine(Cedrus deodar and Pinus thunbergii) needles were determined simultaneously with the levels of polycyclic aromatic hydrocarbons(PAHs).

Taking thirty-six varieties of jujube as test material,stomata opens degree,stomata size and stomata density were observed.

Through comparison and observation on different kinds of Clivia miniata Regei water-cultivated Seedlings and soil-cultivated seedlings the change of stomata density,stomata size,stomata divergence of the leaves’ lower epidermis in the daytime,the result shows that Water-Cultivated Seedlings’stomata is obviously larger than that of soil-cultivated seedlings.

The changes of water-use efficiency and stoma density of Leymus chinensis along Northeast China Transect;

The leaf characters of stoma density, chlorophyll content, leaf shape and leaf pasture of garlic germplasm introduced from different part of China were studied.

It was found that each species had a special stoma density,and the stoma types were different between Angiopteris fokiensis Hieron and Archangiopteris henryi Christ et Gies,which could be considered as key characters to the genera and species of Angiopteridaceae.