Microstructures and tensile properties of 304 steel with dual nanocrystalline and microcrystalline austenite content prepared by aluminothermic reaction casting

The microstructures of 304 stainless steels with different amounts of nanocrystalline and microcrystalline austenite prepared by an aluminothermic reaction casting, without and with annealing at 1073?K for 8?h, have been investigated by X-ray diffraction, an electron probe micro-analyser, a transmission electron microscope and a scanning electron microscope. The steels, both without and with annealing, consisted of different dual nanocrystalline and microcrystalline austenite combinations and a little nanocrystalline δ ferrite, while the average grain size of the nanocrystalline austenite increased from 19 to 26?nm and volume fraction of the microcrystalline austenite increased from 17 to 30% after annealing. The tensile strength of the steel was dramatically increased from 500 to 1000?MPa and the tensile elongation ratio increased from 8 to 12% after annealing. However, the tensile strength was decreased to 600?MPa and the tensile elongation ratio increased from 12 to 22% after an annealing at 1273?K. The combination of dual nanocrystalline and microcrystalline austenite obtained after the annealing at 1073?K results in the best tensile properties.     

Distinct and shared cognitive functions mediate event- and time-based prospective memory impairment in normal ageing

Prospective memory (PM) is the ability to remember to perform an action at a specific point in the future. Regarded as multidimensional, PM involves several cognitive functions that are known to be impaired in normal ageing. In the present study we set out to investigate the cognitive correlates of PM impairment in normal ageing. Manipulating cognitive load, we assessed event- and time-based PM, as well as several cognitive functions, including executive functions, working memory, and retrospective episodic memory, in healthy participants covering the entire adulthood. We found that normal ageing was characterised by PM decline in all conditions and that event-based PM was more sensitive to the effects of ageing than time-based PM. Whatever the conditions, PM was linked to inhibition and processing speed. However, while event-based PM was mainly mediated by binding and retrospective memory processes, time-based PM was mainly related to inhibition. The only distinction between high- and low-load PM cognitive correlates lies in an additional, but marginal, correlation between updating and the high-load PM condition. The association of distinct cognitive functions, as well as shared mechanisms with event- and time-based PM, confirm that each type of PM relies on a different set of processes.     

Correlates of child abuse potential

Coercion theory provided the theoretical rationale for the present study. The hypothesis was that mothers' reports of child behavior problems and mothers' reports of external locus of control would be related to abuse potential. A total of 95 mother-child pairs were screened for child abuse potential during visits to a hospital-based pediatrie clinic. Following brief interviews, mothers completed three measures: Milner's Child Abuse Potential Inventory, Levenson's Locus of Control Scales, and the Revised Behavior Problem Checklist. Perceptions of control by powerful others and by chance were related to abuse potential for mothers of both sexes. Mothers' reports of their sons' anxiety-withdrawal and conduct-disorder behavior problems were related to abuse potential. There was a significant association among lie scores, internality, and abuse potential for mothers of female children. Mothers with high abuse potential reported significantly more behavior problems in their children. The findings were discussed in relation to coercion theory.Portions of this paper were presented at the biennial meeting of the Society for Research in Child Development, Detroit, April 1983. This research was conducted by the first author in partial fulfillment of the requirements for the Ph.D. at the University of Miami under the direction of Drs. Keith G. Scott and Annette M. La Greca. The first author wishes to thank the members of the committee, Drs. Herbert C. Quay, Simon B. Miranda, Daryl Greenfield, and Julia Rosenkrans, for their many contributions. Also, special thanks to the University of Miami Child Protection Team for their continuous support and guidance, and special appreciation to the mothers and children who participated in the study.     

Work options for women in women's magazines: The medium and the message

A content analysis of women profiled in women's magazines asked, How do “established” vs. “new” magazines differ in socialization messages about work options for women? Six established and four new magazines were analyzed from 1971 through 1980, for a total random sample of 232 issues (172 individual profiles). Three hypotheses were investigated. Compared to new magazines, established magazines are (1) less likely to present women in a variety of work roles and (2) more likely to profile women in “traditional” occupations. (3) Employed women profiled in established magazines are less likely to perceive themselves as having responsibility and/or power/influence in relation to their jobs. Hypotheses 2 and 3 were supported. The discussion highlights changes in both types of magazines but notes the fairly traditional message established magazines present vs. new magazines.     

Clinical tests of memory in dementia, depression, and healthy aging

In Study 1, carefully screened elderly adults with primary degenerative dementia or major depression were compared to healthy aged control subjects on three tests of learning and memory: the Benton Visual Retention Test, Inglis Paired-Associate Learning Test, and the Fuld Object-Memory Evaluation (OME). The sharpest distinction in performance among the groups was observed on the OME, and discriminant equations based on this test correctly classified a high percentage (greater than or equal to 90%) of participants. Study 2 applied the classification rules derived in the first investigation to an unselected series of geropsychiatry inpatients referred for neuropsychological evaluation. There was agreement between memory test classification and general categories of clinical discharge diagnosis (organic vs. functional) for 21 of 25 patients, and with status at follow-up approximately 18 months later. Predictive value computations suggested that the OME is more accurate in confirming true dementia than in detecting dementia syndromes associated with functional disorders.     

Spiral aftereffects after long-term delay

Tested the effects of three kinds of postadapation stimuli on short- and long-term spiral aftereffects. Magnitude and duration of short-term aftereffects were significantly reduced by 5 min. of no visual stimulation preceding inspection of the postadaptation field. Results do not support previous findings of long-term aftereffects.     

Approximate truth

Conclusion The technical results presented here on continuity and approximate implication are obviously incomplete. In particular, a syntactic characterization of approximate implication is highly desirable. Nevertheless, I believe the results above do show that the theory has considerable promise for application to the areas mentioned at the top of the paper.Formulation and defense of realist interpretations of science, for example, require approximate truth because we hardly ever have evidence that a particular scientific theory corresponds perfectly with a portion of the real world. Realists need to assert, then, that evidence for a theory is evidence for its approximate truth, not its truth (see [3] and [18]). Approximate truth is, however, a vague notion, and specification of quantity terms and of a sense of approximation are needed to make precise applications of it. Suitability of both vocabulary and sense of approximation depend on the subject matter, and their selection is a partly empirical matter that raises complex issues. In light of the number of common inferences which are not continuous, realists also need to be concerned about indiscriminate use of deductive logic to derive consequences from approximately true theories. These issues will be considered further in a future paper.Approximate truth also has potential application in areas of artificial intelligence that require inference from inaccurate data. In the qualitative physical theories of de Kleer and Brown [6], for example, qualitative values are derived by partitioning the real numbers into regions. Inferences leading from inside to outside a region must be identified and avoided, and approximate implication and continuity may prove useful in doing this. More generally, growing use of predicate logic as a programming language invites application of the theory of approximate truth as a symbolic substitute for numerical evaluation of computation errors. This too will be the subject of a future paper.Thanks to R. Boyd, A. Garfinkel, H. Hertz, P. Solomon, P. Suppes, S. Weissman, and anonymous referees for advice and criticism.     

The patient in the family and the family in the patient

The notion that the family is “the unit of care” for family doctors has been enigmatic and controversial. Yet systems theory and the biopsychosocial model that results when it is imported into medicine make the family system an indispensable and important component of family medicine. The challenge, therefore, is to provide a coherent, plausible account of the role of the family in family practice. Through an extended case presentation and commentary, we elaborate two views of the family in family medicine — treating the patient in the family and treating the family in the patient — and defend both as appropriate foci for care by family doctors. The practical problem that arises when the family is introduced into health care is deciding when to concentrate on the family system. The moral problems that arise concern how extensively doctors may become involved in the personal lives of their patients and families. The patient-centered clinical method provides a strategy for handling both problems. Thus, making the family a focus of care in family medicine can be justified on theoretical, practical, and moral grounds.