Compliance calibration of a family of short rod and short bar fracture toughness specimens

A family of short rod and short bar specimen geometries is defined for which the calibrations of all members of the family are equivalent. The family includes most of the short rod and short bar specimens now being used to test metallic materials. Experimental compliance vs crack length measurements were made for calibration purposes on members of the family and on specimens which purposely differed from the family in certain respects. The resulting calibrations are presented in a form which is readily usable in analyzing short rod/short bar fracture toughness tests.The calibrations of this study are used to correlate with previously published short rod calibrations. Very good agreement among compliance-derived calibrations was found, but the currently-used calibration based on comparison testing against ASTM E399 K_Ic tests was found to be several percent lower than the compliance-based calibrations. Probable reasons for such a discrepancy are discussed, and recommendations are made concerning which calibration to use.     

Explorations in ecological psychology.

The "great diversity of coupling between psychologists and psychological phenomena can be divided into 2 types which produce data of crucially different significance for the science of psychology." (1) Psychologists as Transducers—T Data: The psychologist transforms data and in effect is a translating machine. (2) Psychologists as Operators—O Data: The psychologist "achieves control which allows him to focus upon segments and processes of particular concern to him, via data that refer to events which he, in part, contrives." Psychologists "as operators and as transducers are not analogous, and… the data they produce have fundamentally different uses within science. A central problem of our science is the relation between ecological events (the distal stimuli) at the origin of E-O-E [environment-organism-environment] arcs and the succeeding events along these arcs." There "are a number of reasons for avoiding the role of transducer in psychological research… . The skills and personality attributes required of a successful transducer are different from those of a successful operator… . The techniques of the transducer are in many respects more difficult than those of the operator." (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Malignant eccrine acrospiroma. A case study

A 37-year old patient was anaesthetised twice within 4 weeks for surgery of a vertebral disc prolapse. The first anaesthesia was performed with volatile anaesthetics without any anomalies. After the second operation in total intravenous anaesthesia with propofol and alfentanil the excitatory form of a central anticholinergic syndrome occurred. The application of physostigmine resulted in an immediate and complete disappearance of the symptoms.     

Gorham's disease: a literature review and case reports

Gorham's disease (disappearing bone disease, massive osteolysis, idiopathic osteolysis, essential osteolysis, progressive atrophy of bone, spontaneous absorption of bone, phantom bone, hemangiomatosis/lymphangiomatosis of bone, progressive osteolysis) is an extremely rare occurrence. There are fewer than 150 reported cases in the literature. This disorder can be characterized by spontaneous or posttraumatic progressive resorption of bone. The etiology is still very speculative, the prognosis unpredictable, and any effective therapy still unknown. This paper presents a review of the literature and two case reports of suspected Gorham's disease of the bones of the foot.     

Developmental study of praise and blame as attributional cues.

Meyer et al. (1979) documented that praise following success and the absence of blame following failure are used by adults to infer low ability. In the present study, the Meyer et al. methodology was modified for examining developmental differences in the use of praise and blame as attributional cues. Children ages 4 to 12 years were presented with videotaped scenarios depicting two students who either succeeded or failed at an achievement task. The feedback to these students was either praise versus neutral feedback following success or blame versus neutral feedback following failure. Participants then judged the effort and ability of each target child. All children inferred that the praised student was higher in effort and that the blamed student was lower in effort than were their neutral-feedback counterparts. A developmental pattern in ability judgments, however, indicated that only the oldest children inferred lower ability given praise and the absence of blame, as in the Meyer et al. study. The data for the youngest children were opposite to this pattern, with higher ability inferred given praise and lower ability reported given blame. These findings were interpreted as evidence of children's emerging understanding of a compensatory relation between effort and ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Generation of chimeric C5a/formyl peptide receptors: towards the identification of the human C5a receptor binding site

The surgical management of tetralogy of Fallot has undergone important changes in recent years. Earlier repair of tetralogy of Fallot is now favored by many institutions. At Stanford University Medical Center, we have performed definitive repair of tetralogy of Fallot at the time of presentation, regardless of the child's age, with few exceptions. In this report, we describe our results with early repair, and we believe these support the contention that infants who undergo early repair (< 1 year of age) have postoperative results similar to those of children who undergo repair at an older age. Complications related to shunts are prevented by the infant repairs, and, in the future, reduced ventricular ectopy may be demonstrated to be a benefit of such repairs.     

Ibotenic acid lesions of the striatum reduce drug-induced rotation in the 6-hydroxydopamine-lesioned rat

Lesions of the dopaminergic nigrostriatal tract produce a range of motor and sensorimotor deficits. One of the simplest and most reliable is the rotational response of the animal following activation with drugs that stimulate the dopaminergic network, most notably amphetamine and apomorphine. Consequently, the rotation test has been extensively used in assessing the success of treatments designed to restore dopaminergic function, including neural transplants. The present study investigates whether rotation induced by 6-hydroxydopamine lesions of the nigrostriatal bundle in rats is modified by additional lesions in the neostriatum. It was found that apomorphine-induced rotation can be reduced by ibotenic acid lesions of the dopamine-deafferented striatum, and that the extent of the reduction was proportional to the size of the lesions. In contrast, such lesions produced a non-significant reduction in amphetamine-induced rotation, although the correlation between the extent of the reduction and the size of the lesion was again apparent. Since the pattern of change was similar in direction, albeit smaller in magnitude, than the previously reported effects of intrastriatal transplantation in rats with similar nigrostriatal lesions, rotation tests alone do not provide an unequivocal test of graft survival and function.     

Comparison of fixed versus formed aircrews in military transport

Historically, transport crews are formed to fly a brief series of sorties together. But what would be the effect of keeping crews together longer? This research investigates the effect of crewing policies on accident rates. We compare the crew coordination performance of fixed teams that work together indefinitely with that of formed teams that work together for shorter periods. We researched 74 accident investigation records of two jet transport aircraft of the U.S. Air Force over 20-year periods. These aircraft used both fixed and formed crews. The "ineffective crew coordination" accident rates for formed crews were significantly safer (z = 12.5 for one aircraft and 2.1 for another p < 0.05). This may imply that airlines and military commands could enhance flight safety by following a formed crew policy. However, further study is needed to identify more completely the effects of crew policies on sortie effectiveness.