Many species of Populus, particularly cottonwoods of sections Aigeiros and Tacamahaca, remain recalcitrant to genetic transformation. We demonstrate that transgenic trees can be readily produced in several poplar genotypes using wild-type Agrobacterium rhizogenes. Hairy roots were produced in a variety of clones that included Populus trichocarpa Torr. & A. Gray,...
High-pressure torsion (HPT) is an effective severe plastic deformation (SPD)
technique to produce bulk nanostructured materials (BNMs). These BNMs often show a combination of exceptional mechanical and physical properties. Processing of single metals and alloys by HPT has been understood that the homogenous microstructures can be achieved throughout the disk...
Processing of metals through the application of high-pressure torsion (HPT) provides significant grain refinement in bulk metals at ambient temperatures. The ultrafine-grained (UFG) materials processed by HPT generally demonstrate the superior physical and mechanical characteristics. For utilizing the benefit of HPT, the feasibility of conventional HPT processing was demonstrated recently...
Aluminum alloys are popular in aerospace and automotive industries because of their relatively high strength-to-weight ratio. The study of enhancing aluminum’s mechanical properties through grain refinement is especially important. One such technique is High-Pressure Torsion processing (HPT), which leads to significant grain size refinement and enhances mechanical properties like ductility...
For the purpose of investigating the fundamental nature of the
interannual oscillation observed in the tropical Pacific in conjunction with
El Nino/Southern Oscillation (ENSO), the Comprehensive Ocean
Atmosphere Data Set was analyzed. Based upon this analysis, an
"intermediate" tropical atmosphere-ocean coupled model was developed.
For reason of their particular importance...
This study examined job satisfaction levels between employed
single women and employed married women. The specific objectives of
the study were: (1) to investigate differences in the level of job
satisfaction between employed single women and employed married
women- (2) to investigate the factors whicn influence the level of
job...
This study examined the experiences of five Korean American mothers in Oregon and California who have children with disabilities using qualitative research analysis. The mothers' adaptation processes were individually analyzed, and these mothers' overarching experiences were discussed with three major themes: (a) caring for family cohesiveness, (b) needs for social...
In this dissertation, I qualitatively examined the meaning of mothering a child with autism in two countries: the United States and South Korea. The overarching research question focused on how sociocultural ideas about mothering and disability, particularly autism spectrum disorders, shape women’s understanding of themselves and their children with disabilities....
High-pressure torsion (HPT) is used to investigate the formation of a new metal system by the direct bonding of separate disks of Al and Cu by processing at room temperature under a compressive pressure of 6.0 GPa and with increasing numbers of HPT turns up to 60. A detailed examination...
The coexistence problem occurs when a single wireless body area network (WBAN) is located within a multiple-WBAN
environment. This causes WBANs to suffer from severe channel interference that degrades the communication performance of each
WBAN. Since a WBAN handles vital signs that affect human life, the detection or prediction of...