The Web Magazine 1969, March

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue talks about the success of Sock it to Me Week and the speakers who attended. It also gives a detailed description (with pictures) of the new home of the president, Webb-Knoll.https://digitalcommons.gardner-webb.edu/the-web/1014/thumbnail.jp

The Web Magazine 1969, April

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue lists some of the first junior applicants to Gardner-Webb, recognizes Carolyn Stone as May Queen, and reminds students of the upcoming $10,000 scholarship announcement.https://digitalcommons.gardner-webb.edu/the-web/1015/thumbnail.jp

The Web Magazine 1969, February

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue talks about O. Max Gardner and the legacy she left for Gardner-Webb. It also asks alumni to consider donating to Gardner-Webb.https://digitalcommons.gardner-webb.edu/the-web/1013/thumbnail.jp

The Web Magazine 1968, November

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue gives a schedule of Homecoming, lists a few new faculty members, and talks about where Gardner-Webb stands with obtaining its four year status.https://digitalcommons.gardner-webb.edu/the-web/1011/thumbnail.jp

The Web Magazine 1969, May

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue provides detailed information about the 1969 Alumni Banquet, announces a new director of the Division of Psychology and Education, and it lists donors to the Annual Fund.https://digitalcommons.gardner-webb.edu/the-web/1016/thumbnail.jp

The Web Magazine 1969, June

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue names Dr. J. Joy Robinson as Alumnus of the Year , talks about several scholarships, and mentions 20 students who are on mission.https://digitalcommons.gardner-webb.edu/the-web/1017/thumbnail.jp

The Web Magazine 1968, December

The Web Magazine focuses on alumni news and campus events from Gardner-Webb College; now Gardner-Webb University. This issue announces that it was voted at the Baptist State Convention of NC for Gardner-Webb College to have status as a senior college.https://digitalcommons.gardner-webb.edu/the-web/1012/thumbnail.jp

Single-Molecule Imaging of an in Vitro-Evolved RNA Aptamer Reveals Homogeneous Ligand Binding Kinetics

Many studies of RNA folding and catalysis have revealed conformational heterogeneity, metastable folding intermediates, and long-lived states with distinct catalytic activities. We have developed a single-molecule imaging approach for investigating the functional heterogeneity of in vitro-evolved RNA aptamers. Monitoring the association of fluorescently labeled ligands with individual RNA aptamer molecules has allowed us to record binding events over the course of multiple days, thus providing sufficient statistics to quantitatively define the kinetic properties at the single-molecule level. The ligand binding kinetics of the highly optimized RNA aptamer studied here displays a remarkable degree of uniformity and lack of memory. Such homogeneous behavior is quite different from the heterogeneity seen in previous single-molecule studies of naturally derived RNA and protein enzymes. The single-molecule methods we describe may be of use in analyzing the distribution of functional molecules in heterogeneous evolving populations or even in unselected samples of random sequences

Numerical Solution of Differential Equations by the Parker-Sochacki Method

A tutorial is presented which demonstrates the theory and usage of the Parker-Sochacki method of numerically solving systems of differential equations. Solutions are demonstrated for the case of projectile motion in air, and for the classical Newtonian N-body problem with mutual gravitational attraction.Comment: Added in July 2010: This tutorial has been posted since 1998 on a university web site, but has now been cited and praised in one or more refereed journals. I am therefore submitting it to the Cornell arXiv so that it may be read in response to its citations. See "Spiking neural network simulation: numerical integration with the Parker-Sochacki method:" J. Comput Neurosci, Robert D. Stewart & Wyeth Bair and http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2717378

Effects of crack tip geometry on dislocation emission and cleavage: A possible path to enhanced ductility

We present a systematic study of the effect of crack blunting on subsequent crack propagation and dislocation emission. We show that the stress intensity factor required to propagate the crack is increased as the crack is blunted by up to thirteen atomic layers, but only by a relatively modest amount for a crack with a sharp 60$^\circ$ corner. The effect of the blunting is far less than would be expected from a smoothly blunted crack; the sharp corners preserve the stress concentration, reducing the effect of the blunting. However, for some material parameters blunting changes the preferred deformation mode from brittle cleavage to dislocation emission. In such materials, the absorption of preexisting dislocations by the crack tip can cause the crack tip to be locally arrested, causing a significant increase in the microscopic toughness of the crack tip. Continuum plasticity models have shown that even a moderate increase in the microscopic toughness can lead to an increase in the macroscopic fracture toughness of the material by several orders of magnitude. We thus propose an atomic-scale mechanism at the crack tip, that ultimately may lead to a high fracture toughness in some materials where a sharp crack would seem to be able to propagate in a brittle manner. Results for blunt cracks loaded in mode II are also presented.Comment: 12 pages, REVTeX using epsfig.sty. 13 PostScript figures. Final version to appear in Phys. Rev. B. Main changes: Discussion slightly shortened, one figure remove