Thermolysis of spiro[2.4]hepta-1,4,6-triene (1a) at 50 degrees C yielded bicyclo[3.2.0]hepta-1,3,6-triene (5), which dimerized in two different fashions to form cyclobutanes. The 1,2-dimethyl and 1-propyl derivatives of 1a also rearranged at 50 degrees C, but at a faster rate, each yielding a pair of cyclobutane dimers. The structures of these symmetrical dimers were investigated by 1D and 2D N...

With the increasing provision of orthodontic care in this country, certain practitioners have raised concerns regarding the use of elective extractions and retraction mechanics, especially the effects on the facial profile and the TMJ. The non-extraction versus extraction debate spans the history of orthodontics, and the concepts of facial attractiveness are subject to change as fashions change...

Like any other domain of human activity, psychology has its fads and fashions. One consequence of fads is an overconcentration of resources on specific problems or approaches, which leaves other important problems or approaches (holes) underappreciated and understudied. This article is primarily about different factors (such as negativity bias, polarization of positions, focus on internal cause...

Interest in Knowledge Management (herein ‘KM’) has soared in the last few years. Despite what might be said about the feasibility or robustness of the idea, undoubtedly one of its astounding ‘successes’ is its heated diffusion among both academic and practitioner communities. This diffusion, together with its popularity among major consultancies suggest that it has the hallmarks of a management...

Fiber optic cables are widely used in modern systems that must provide stable operation during exposure to changing environmental conditions. For example, a fiber optic cable on a satellite may have to reliably function over a temperature range of -50°C up to 125°C. While the system requirements for a particular application will dictate the exact method by which the fibers should be prepared, t...

Teenagers currently spend an estimated $153 billion a year on everything from computers to cars to clothes (Brand, 2000). Trend conscious teens are very active in utilizing the media and advertising in seeking out the latest products, services, and fashions (Zollo, 1995). A greater understanding of teens’ role model influences can help organizations and their advertising agencies more effective...

We present a novel method for FrameNetbased semantic role labeling (SRL), focusing on limitations posed by the limited coverage of available annotated data. Our SRL model is based on Bayesian clustering and has the advantage of being very robust in the face of unseen and incomplete data. Frame labeling and role labeling are modeled in like fashions, allowing cascading classification scenarios. ...

We adapt the inverse iteration method for symmetric matrices to some nonlinear PDE eigenvalue problems. In particular, for p ∈ (1,∞) and a given domain Ω ⊂ Rn, we analyze a scheme that allows us to approximate the smallest value the ratio ∫ Ω |Dψ| pdx/ ∫ Ω |ψ| pdx can assume for functions ψ that vanish on ∂Ω. The scheme in question also provides a natural way to approximate minimizing ψ. Our an...

In the heady days of his education, enthralled with science, he devoured fruit from the tree of knowledge, binged on ideas, gorged on words of biochemists, bacteriologists, pathologists. Progress his mantra, a sense of infallibility his protection, everything seemed possible. As years passed, new paradigms eclipsing old, drugs he'd prescribed did little good, procedures brought no benefit, some...

In the title compound, [Re(C10H6NO2)(CO)3{As(C6H5)3}], the coordination environment of Re(I) is that of a distorted octa-hedron. Three coordination sites are occupied by three carbonyl groups in a facial arrangement and the remaining three sites by tri-phenyl-arsane and deprotonated quinaldic acid in As-mono- and N,O-bidentate fashions, respectively. In the crystal, the complexes are linked thr...