Optical Imaging and Spectroscopy of the Galactic Supernova Remnant 3C 58 (G130.7+3.1)

We present a comprehensive imaging and spectroscopic survey of optical emission knots associated with the young Galactic supernova remnant 3C 58. Hα images show hundreds of clumpy filaments and knots arranged in a complex structure covering a nearly circular area roughly 400\u27\u27 in diameter. A quite different emission structure is seen in [O III], where the brightest features are less clumpy and largely confined to the remnant\u27s northwest quadrant. Measured radial velocities of over 450 knots reveal two distinct kinematic populations; one with average and peak expansion velocities of 770 and 1100 km s−1, respectively, forming a thick shell, and the other showing |v| ≤ 250 km s−1. High-velocity knots (|v| ≥ 500 km s−1) exhibit a strong bipolar expansion pattern with redshifted and blueshifted knots located in northeastern and southwestern regions, respectively. These knots also show strong [N II]/Hα line emission ratios, suggesting enhanced N/H. In contrast, the slower expanding knot population shows much lower [N II]/Hα line ratios and likely represents circumstellar mass loss material from the 3C 58 progenitor. Proper-motion estimates using images spanning a 28 yr time interval suggest positional shifts of between 0.5\u27\u27 and 2.0\u27\u27, implying proper motions of 0.02\u27\u27-0.07\u27\u27 yr−1. These values agree with previous estimates but are much less than the ≈0.2\u27\u27 yr−1 expected if 3C 58 were associated with historic guest star of 1181 CE

An evaluation of sodium carbonate as a replacement for sodium hydroxide in hydrogen peroxide bleaching of CTMP

"December 1991.""Submitted for presentation at CPPA Annual Meeting, January 28, 1992, Montreal, Canada.

Mechanical pulping by fractionation after low energy refining

"October 1993.""Submitted to Tappi Journal.

Nanofibrillated Cellulose from Appalachian Hardwoods Logging Residues as Template for Antimicrobial Copper

TEMPO nanofibrillated cellulose (TNFC) from two underutilized Appalachian hardwoods, Northern red oak (Quercus rubra) and yellow poplar (Liriodendron tulipifera), was prepared to determine its feasibility to be used as template for antimicrobial metallic copper particles. In addition, a comparison of the TNFC from the two species in terms of their morphological, chemical, thermal, and mechanical properties was also performed. The woody biomass was provided in the form of logging residue from Preston County, West Virginia. A traditional kraft process was used to produce the pulp followed by a five-stage bleaching. Bleached pulps were then subjected to a TEMPO oxidation process using the TEMPO/NaBr/NaClO system to facilitate the final mechanical fibrillation process and surface incorporation of metallic copper. The final TNFC diameters for red oak and yellow poplar presented similar dimensions, 3.8±0.74 nm and 3.6±0.85 nm, respectively. The TNFC films fabricated from both species exhibited no statistical differences in both Young’s modulus and the final strength properties. Likely, after the TEMPO oxidation process both species exhibited similar carboxyl group content, of approximately 0.8 mmol/g, and both species demonstrated excellent capability to incorporate antimicrobial copper on their surfaces

Wood and how it relates to the paper products

"August 1995.""Submitted to TAPPI Pulping Conference, October 1-5, 1995, Chicago, Illinois.

Closed mill operation: an analysis of competition for pulp binding sites. Project F017, report 1 : a progress report to the member companies of the Institute of Paper Science and Technology

Project and report numbers not unique, use dates to distinguish."January 13, 1998.

Wood influence on thermomechanical pulp quality. Part 1, Fiber separation and fiber breakage

"December 1999.""Submitted to Tappi Journal.

Surface area, bonded area, and surface lignin

"January 1999.""Submitted to Journal of Pulp and Paper Science.

Ideal fibers for pulp and paper products

"June 1991.""Presented at 21st Southern Forest Tree Improvement Conference, Knoxville, Tennessee, June 17-20, 1991.