The mechanical properties of SiO 2 filler particles on carbon fibers have been under discussion for several decades; the diverse models, and the properties of the components relevant to retention, are critically reviewed in the first part of this study. In addition, to gain an insight into some possible combined effect of the carbon fiber/poly(methyl methacrylate) (CF/PMMA), interfacial adhesion strength and the tensile properties and dielectric strength of the hybrid composites were studied. Simple modified rules of mixtures are used to estimate the fiber efficiency factors for the strength and modulus of the hybrid composites. Except, with the increasing fraction of CFs in PMMA, the weld line area's elongation percent is decreased. Whereas for case of SiO 2 , the 10 wt% is the threshold for micro injection molded weld line tensile strength and dielectric strength turning from decrease trend to increase. Same as CF, elongation of micro weld line samples is in general lower than neat PMMA as well, due to the addition of SiO 2 particles.
This paper researches into the influential factor affecting operating performance of small and medium-sized S&T Enterprises. It is found that the years of operating and the scale of net assets both have a positive effect on the performance, while registered capital has a negative effect. Though the category of industry doesn't exhibit a clear influence on the performance, different ways of financing do affect the performance considerably.
In order to solve the problems of heavy workload, low efficiency, inconvenient transportation and complex terrain, difficulties in regional monitoring and evidence collection, and insufficient quantitative analysis ability in traditional river and lake management, this paper studies and summarizes the literature and policies related to river and lake information management by using the integration of Internet, UAV, GIS and other technologies in recent years, The technical methods and means of river and lake management and protection are put forward to provide reference for improving water management system and ensuring water safety.
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