Fibers statistical treatment

For analysis of free compounds, the headspace analysis with a multiphase fiber is even more interesting and less time-consuming. This approach can replace the majority of the quantification of free compounds measured by SPE techniques, considering also the possibility of the sampling automation using a GC-MS system which can be coupled to a statistical treatment of fragments abundance (Kinton et al., 2003 Cozzolino et al., 2006). Moreover, HS-SPME/GC-MS is a very effective and efficient method to analyze specific compounds present in trace levels at about ppt level, because they can be better and selectively enriched in the headspace. This method is employed nowadays to quantify some important and peculiar sensory compounds such as ethyl and vinylphenols, pyrazines, cork off-flavour substances (TCA, etc.) and other contaminants such as geosmine (Riu et al., 2002 Chatonnet et al., 2006) and, as shown below, sulphur volatiles. 

Stabilization compounding As a nucleating agent, 0.5% low-dispersion taleum powder was injected, the filler is 35% glass fiber Tensile strength, MPa Relative elongation, % Statistical treatment data ... 

Due to the huge scatter of the single results, it cannot be recommended to apply both statistical treatment of the data and other approaches involving conventional micromechanical single fiber test methods. 

Scanning Electron Microscopy. Fiber samples were taken before and after treatments and observed under the microscope. Fibers were selected randomly, and no attempt was made to statistically document the findings. Figures 2 and 3 illustrate some of the noted characteristics of the cotton fibers. Figure 2 shows a cotton fiber from... 

We can regard a fiber as consisting of a chain of links. We assume that fiber failure occurs when the weakest link fails. This is called the weakest-link assumption. It turns out that such a weak-link material is well described by the statistical distribution known as the Weibull distribution (Weibull, 1939,1951). We first describe the general Weibull treatment for brittle materials and then describe its application for fibers. 

Headspace is useful for the trace analysis of compounds having a high affinity for the fiber phase and that can be enriched in the HS of the sample. The use of a multiphase fiber is a very interesting and low time-consuming approach. It also considers the possibility of sampling automation using a GC/MS system coupled with a statistical method for treatment of fragment abundance (Kinton et al., 2003 Cozzolino et al.,2006). 

Let us consider further diffiisive processes influence on interfacial regions formation in the studied nanocomposites. In Refs. [12, 13], the treatment of depositions structure formation on fibers and surfaces within the frameworks of irreversible aggregation models was proposed. Within the framework of this treatment the relationship between mean-square deposition (interfacial layer) thickness and particles (statistical segments) number . in it atwas proposed [13] ... 

A statistical analysis based on t-tests was carried out, taking into account the changes of the tensile property results of PBA-based SMPU fibers (Tables 11.8 and 11.9). The significant level of the statistical analysis is 0.05, while and are respectively defined as the tensile property results of the treatment specimen which are the same as the untreated sample and the tensile property results of the treatment specimen which are not the same as the untreated sample . The hypotheses and t-value are defined as follows. 

Tables 11.8 and 11.9 show the statistics of the breaking strain and tenacity of thermal-humidity treated PBA-based SMPU fibers, when compared with an untreated specimen. Condition e has a temperature of 50°C and relative humidity of 30%. When condition e occurs, the breaking tenacity drops fi om 0.532 to 0.477 cN/dtex, and then increases with treatment time. Finally, the breaking tenacity of specimen e-190 returns to the original value of 0.52cN/dtex. However, the differences in the...

SDF-la treatment exhibited a decrease in wound surface area with more cellular wounds and increased granulation tissue volume and resulted in complete epithelialization at 2 weeks Statistically significant increase in angiogenesis and substantially thicker, more coherently aUgned collagen fibers... 

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