Search PubMed⌕ Search

Biomedical subjects

G Rudinger

Publications and source records attributed to G Rudinger.

10 recordsLinked to original sources
PubMed1997

Evidence of the cross-cultural stability of the factor structure of the SKT short test for assessing deficits of memory and attention.

Many of the psychometric instruments employed in dementia research are adapted versions of tests developed in countries different from those in which they are applied. The validity of these instruments has been established in their countries of origin; however, there is little information available regarding their validity when transferred to other cultures. The SKT, a short cognitive performance test for the assessment of memory and attention deficits developed and validated in Germany, was administered in research centers in Chile, Greece, Russia, and England. SKT raw scores were factor analyzed with regard to a prespecified target structure, i.e., the factor solution found for a large German reference sample. The cross-cultural stability of the test was assessed using a statistical method that combined the perfect congruent weights approach and the bootstrapping technique. This procedure allowed for testing the similarity between factorial solutions obtained for the different centers. Results clearly indicate the factorial stability of the SKT in the countries participating in the study.

Adolescent↗
PubMed1980

Shock waves in fluid-filled distensible tubes.

Flow of a liquid through distensible tubes is of interest primarily in biological systems, and some properties of shock waves in such tubes are discussed. In shock-fixed coordinates, these flows are steady, and the shock is associated with an increase of pressure and cross-sectional area. Shock transition is analyzed for two flow models, namely, immediate flow separation, when the flow enters the shock zone, and no separation. Shock properties are expressed in terms of the speed index (ratio of the velocity of the shock to that of a small-amplitude wave) and dissipation (loss of total pressure). Examples are worked out for the thoracic aorta of an anesthetized dog, a perfectly elastic tube, and a partially collapsed tube. Appreciable differences in shock velocity and dissipation result if either flow separation or no separation is assumed.

Animals↗
PubMedDate not supplied

Slit design considerations for rotating-aperture, scanning-beam radiography.

The rotating-aperture wheel (RAW) scanning-beam device is uniquely applicable for scatter elimination in short-time, rapid-sequence, and real-time radiographic imaging because of the continuous rotary motion of its slit pattern. This rotary motion places special restrictions on the slit pattern design. Although simple sector-shaped slits provide uniform primary transmission, they entail an unacceptable degree of slit widening on small-diameter wheels. The use of multiple slit zones with slits of different angular width has reduced the extent of this widening on a prototype RAW; however, interzone boundary artifacts caused by differential primary x-ray cutoff are apparent on some clinical images. This problem is eliminated with a unique spiral-shaped aperture pattern which consists of slits of constant width and constant spacing. Each slit is radially continuous and provides uniform primary transmission without interzone artifacts. This spiral pattern satisfies all requirements and appears to be the pattern of choice for rotating-aperture scanning-beam radiography.

Equipment Design↗
PubMedDate not supplied

[Crises in old age. Trial with a multivariant analysis of adjustment strategies in crises].

After a short review of some relevant theories focusing mainly on their developmental aspects, an own model is proposed. This is statistically analysed by means of the LISREL-algorithm, which is applied to data concerning crises behavior in a problematic housing situation, and which were gained from the Bonn-Longitudinal Study of Aging. From the psychological point of view, especially those findings seem to be important which imply that an active and problem-oriented coping strategy is often joined but not overruled by a passive and problem-disoriented one, whereas, if a problem-disoriented strategy predominates, this interferes with any rather active solution strategies turning up. Moreover, the situational stress is perceived more intensive under active rather than under passive strategies and--additionally--health and (test-)intelligence turned out to interact with other variables in a specific way: high intelligence covaries with low scores on perceived stress and passive coping styles, while stressed health rather correlates with passive strategies and a raised subjective load.

Adaptation, Psychological↗
PubMedDate not supplied

[Social conditions and intelligence in old age].

There is a complex structure of conditions which are accepted to be of effect on development of intelligence in old age. We turned particularly to the socioeconomic conditions with their stimulating or depriving attributes. With a pathanalytic model we were able to explain about 38% of variance of intellectual performance at the first measurement point of the Bonn Longitudinal Study of Aging (BLSA). With this model we took into consideration the family environment of the aged BLSA people (60-75 yrs.) at their youth as well as some indicators of the aged peoples' socioeconomic status (educational and occupational level) in their later life history.

Adult↗
PubMedDate not supplied

[Aging and technology].

This contribution focusses on coping with everyday technology which is embedded in the broader framework of age-friendly environments. The majority of the elderly has to make use of everyday technology (bank tellar machines, ticket machines, TV and video recorder and remote controls, hightech phones, fax machines) in order to live an independent and competent life. There are much more studies investigating acceptance of and attitudes towards modern technology than empirical studies which turn to the concrete question how to cope with modern technology in the behavioral domain. Studies of this kind identify problems in using technology and derive intervention procedures which offer possibilities, potentials and options for the user. Some results from own studies of the latter kind are presented and some suggestions are given regarding transgenerational design of everyday technology.

Activities of Daily Living↗