one of a group of cells that develop in the walls of the seminiferous tubules. Spermatogenic cells include spermatogonia, spermatocytes, and spermatidsâall of which are transitional forms between primary sexual cells and spermatozoa.
long-haul optics. Long-haul optics refers to the transmission of visible light signals over optical fiber cable for great distances, especially without or with minimal use of repeaters. Normally, repeaters are necessary at intervals in a length of fiber optic cable to keep the signal quality from deteriorating to the point of non-usability. In long-haul optical systems, the goal is to minimize the number of repeaters per unit distance, and ideally, to render repeaters unnecessary.
V-Wrapâ¢ Carbon Fiber is a structural strengthening system for the restoration or renewal of pressure pipe. The system has been tested and meets or exceeds durability requirements necessary to provide the desired service life for pipeline structures. V-Wrapâ¢ Carbon Fiber (CFRP) systems are comprised of high-strength carbon fibers fully saturated in a resin matrix. These thin, low-profile laminates are bonded to the interior or exterior of pipelines forming a composite lining with the existing host pipe structure.