Objectives: To estimate exposures to asbestos fibers of specific sizes among asbestos textile manufacturing workers exposed to essentially pure chrysotile using data from transmission electron microscopy (TEM) and to evaluate the extent to which the risk of lung cancer varies with fiber length and diameter. Methods: 3803 workers employed for at least 1 day between 1 January 1950 and 31 December...

the present experiment was carried out to assess the general combining ability (gca) and specific combining ability (sca) of six important commercial cultivars of gossypium hirsutum l. of venezuela, viz., ‘deltapine 16’, ‘tamcot-sp-21’, ‘cabuyare’, ‘stoneville’, ‘ospino’ and ‘acala 90-1’ and their 15 f1 hybrids, respectively. the data were analyzed using griffing’s model i method ii. significan...

poly(vinylidene fluoride) (pvdf) nanofibers were prepared via electrospinning process. several different factors influence on this process and application of experimental design for its optimization is of great importance. the central composite design (ccd) was used for planning and optimizing of the experiments and also, the analysis of variance (anova) was employed for the statistical validat...

Optical fiber for data communication is manufactured by the draw process, which involves heating and pulling high purity glass cylinders to diameters of 125 μm. The diameter of the glass fiber and its light-guide core must remain constant to create a product capable of transmitting high-bandwidth optical data. The draw capstan design has a significant impact on the optical fiber quality. As the...

Potentially low-cost continuous carbon fibers are produced from solvated mesophase pitch through a patented meltblowing process. The structural evolution and properties of the fibers are characterized by various analytical methods. The meltblown fibers are continuous fibers which are collected into a fibrous web form, and the diameter of the filaments is attenuated by the flow rate of air strea...

Dickkopf-1 (DKK1) is an inhibitor of canonical Wnt signaling pathway and regulates hair follicle morphogenesis and cycling. To investigate the potential involvement of DKK1 in wool production and quality traits, we characterized the genomic structure of ovine DKK1, performed polymorphism detection and association analysis of ovine DKK1 with wool production and quality traits in Chinese Merino. ...

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

in this study, the main papermaking characteristics of soybean straw (glycine max) as an agricultural residue were investigated. the fiber biometry and chemical composition of soybean straw were determined. the properties of pulps from soda, soda-aq and monoethanolamine (mea) processes were compared. the average fiber length, fiber diameter, lumen diameter, and cell wall thickness were found to...