Structural Equation Modeling is a blend of multivariate statistical techniques of factor analysis and path analysis. Its strength lies in the quantitative study of the interactive relations among multiple variables. In nearly three decades, SEM is used in a large number of social and behavioral sciences, in the recent years; it has been increasingly used in market research. By SEM technique analyze of tungsten trioxide nanowire, we have a better understand that the impact of changes in external factors caused by the topography. It can be analyzed by the precursor and the reaction temperature.

Nanowires may be defined as having in the transverse direction that is limited to one-dimensional structure at 100 nm (without longitudinal limit). Nanowire suspension means the end of the nanowire under vacuum. Depending on the composition of the material, the nanowire can be divided into different types, including metallic nanowires, nanowires and the insulator semiconductor nanowires.

The preparation of tungsten trioxide nanowire can be divided in three steps. Firstly, obtaining the diameter about 200-500nm tungsten trioxide nanowire, the length about 5-10μu with 1.3g of sodium tungstate reaction in the same conditions. Secondly, we can also study its effect on the appearance of the tungsten trioxide nanowires synthesized by controlling the reaction temperature. Finally, we obtain tungsten trioxide nanowires in the uniform conditions that the reaction time is 32h at 240 ℃, and its diameter is 200-500nm, its length is about 5-10μm.

Fiber refers to the material from continuous or discontinuous filaments thereof. In plants and animals, fiber plays an important role in maintaining organizations. Fibers can be woven into thin, thread and twine, paper or fabric woven fibrous mat; fibers are also used to manufacture materials, and other materials to form composite material. Natural fibers are naturally occurring, we can get fiber naturally, and fibers are divided into different types according to their origins, animal fibers, plant fibers and mineral fibers. In addition, there are chemical fibers, synthetic fibers, synthetic fibers, inorganic fibers and the like. Filling fibers can effectively improve the strength and rigidity of the plastic, reinforce plastic rigid structure.

Tubular tungsten trioxide nano fibers can be used to make gas sensors with high sensitivity and good stability; it shows a bright prospect in the field of gas sensor. Tubular tungsten trioxide fibers can be prepared by template method that has good controllability. This method can use its space limitations and the role of template debugging effect to control the size, morphology, structure and arrangement of the synthetic material.

Making tungstic acid as source of tungsten, placing tungsten acid in the container, and adding the container to the hydrogen peroxide and ethanol, and stirring constantly; immersing AAO template in tungsten trioxide sol about 30min, then rinsing with demonized water, and placing it about 30min in the air, and heating it at 550 ℃ for 6h in the environment, drying it, finally we can obtain similar tubular fiber tungsten trioxide .