F-15 flight flutter test program

The modes to be observed during the F-15 flight flutter test program were selected on the basis of the results of analytical studies, wind tunnel tests, and ground vibration tests. The modes (both symmetrical and antisymmetrical) tracked on this basis were: fin first bending, fin torsion, fin tip roll, stabilator bending, stabilator pitch, boom lateral bending, boom torsion, boom vertical bending, wing first bending, wing second bending, wing first torsion, outer wing torsion, and aileron rotation. Data obtained for these various modes were evaluated in terms of damping versus airspeed at 1525 m (5000 ft), damping versus altitude at the cross-section Mach numbers (to extrapolate to the damping value to be expected at sea level), and flutter boundaries on the basis of flutter margin of various modal pairs representing potential flutter mechanisms. Results of these evaluations are summarized in terms of minimum predicted flutter margin for the various mechanisms

Drug-related problems : a cornerstone for pharmaceutical care

Drug related problems are an essential term in the world of pharmaceutical care. Other terms can be used for the same concept, such as medication errors, but this term is different from drug related problems. The errors refer to the mistakes in the process that could lead to problems. Drug related problems can originate when prescribing, dispensing or taking/administering medicines. Drug use problems by the patient are probably the most frequent, but are not always noticed. There are several classifications for drug related problem, but in this article the classification of the Pharmaceutical Care Network Europe (PCNE) is used to clarify the concepts. Some of the known classifications seem difficult to be used in practice, and especially the reproducibility of the existing classifications should be researched further.peer-reviewe

Precluding discovery of preventability determinations in trucking accidents

The discoverability and admissibility of post-accident “preventability” determinations by trucking companies is often much disputed in truck accident cases. It is well known that Plaintiff’s attorneys will try to construe a trucking company’s classification of an accident as “preventable” as an admission of fault during the course of a lawsuit. However, statements made by the FMCSA provide significant support to a trucking company’s efforts to preclude discovery or admission of preventability determinations in a lawsuit. This articles explores these issues