Recreational activities of lower extremity amputees: a survey

This study summarizes a detailed questionnaire evaluation of recreational activities participated in by 100 persons with lower extremity amputations. Additional information was obtained from prosthetists and physical therapists. Approximately 60% of the respondents are active in sports. Younger persons of either sex, who have had amputations for congenital deformities or trauma, are most active. Level of amputation does not appear to be a determining factor as to whether amputees participated or not. The most common recreational activities are fishing and swimming. Sports causing the amputee most discomfort are hunting and jogging. The ability to run and jump is the most difficult to achieve. Reasons for non-participation are pain, embarrassment, insufficient training and lack of organized sports programs for the disabled. Fear of further injury or an overprotective family are not inhibiting factors, nor is cost of the prosthesis. Only a few people wear specifically designed recreational prostheses, and only one-third of the amputees believe that their prosthetist is knowledgeable about recreational prostheses, while 40% feel the prosthetist discouraged their own ideas about prosthetic innovations. Therapists also proved inadequate in their knowledge and efforts at preparing the amputee for recreation. The amputees indicate a need for improved prosthetic design, and believe that insufficient information, both verbal and written, was given to them.     

Reaction to effect the transformation of anionic polymerization into cationic polymerization: 3. Analysis of block copolymer formation by gel permeation chromatography

A study of the g.p.c. traces of AB poly(styrene-bTHF) materials prepared by anion-to-cation transformation reactions has established conditions under which very narrow molecular weight distributions may be obtained. Dispersities as low as 1.04 were consistently obtained using directly brominated polystyrenes as initiators, and there is evidence that this value is an upper limit controlled by machine broadening. Dispersities of about 1.15 were registered with block copolymers prepared from xylylene-bromide-terminated polystyrenes, but in neither system was there any evidence for a chain scission process to generate homo polyTHF.     

The expression of normal ventricular repolarization in the body surface distribution of T potentials

Isopotential maps from 120 normal subjects were obtained from 192 simultaneously recorded electrocardiographic leads. Maps were plotted at 1 msec intervals during the QRS and 5 msec intervals during the ST-T deflection. Repetition of QRS features was evident during all but the first few msec of the initial half of serial T maps. This suggests similarities of the normal sequence of ventricular excitation and recovery. Such similarities have been demonstrated by direct studies but are not evident from other electrocardiographic examinations. Serial maps during later portions of the T wave showed decreasing intensity of potentials with little change of body surface locations. This also correlates with an established feature of ventricular repolarization, namely that potential difference boundaries with stable locations are widely distributed during part of that process. Findings suggest isopotential maps show features of ventricular recovery not apparent from less extensive examinations.     

Equivalent-circuit parameters for LiTaO3 plate resonators

Expressions for motional inductance and parallel capacitance are derived in terms of physical device parameters for LiTaO3 single-mode energy-trapped resonators. Confirmation of these expressions is provided by measurements on a set of 163°-rotated y plate resonators.     

Family interaction in abusive, neglectful, and normal families

This study represents an attempt to discover whether there are distinctive patterns of day-to-day interactions that distinguish abusive and neglectful families from families with no known history of abusing or neglecting their children. Observational data collected in the homes of 17 abuse, 17 neglect, and 19 control families indicated that the abusive and neglectful parents demonstrated lower rates of interaction, overall, and were more likely to emphasize the negative in their relationships with their children. The implications of these data for further research and for intervention efforts are discussed.     

A method for selecting macro-scale structures with axially loaded members

This paper presents a method to support the selection of lightweight large-scale structures. The method enables the ranking of alternative structural forms, whose axially loaded members can resist to either instability failure or material yield. Unlike previous approaches for concept design, this work models buckling failure to assess the interaction between the choice of a structural form and the choice of the cross-section shapes of its constituents. Shape transformers and scaling factors are introduced to characterize the structural efficiency of alternative cross-sectional shapes. Such parameters are dimensionless and enable to measure the shape efficiency without specifying the details of the cross-section geometry. The approach eases optimization at the concept design stage and it permits to assess how the selection of the member cross-sections impacts the lightweight potential of the structural topology. The model is used to construct charts for optimizing and selecting alternative forms. The method is applied in an industrial setting in order to compare three different structural concepts for a particular design application. The case study identified the potential performance of three structural forms and gave insight into the selection of the parameters that most influence structural performance.     

Milk fats as ingredients

This paper reviews aspects of the use of milk fats as food ingredients from a technico-marketing perspective. Good marketing involves matching the needs of the market place with the strengths of the supplier relative to those needs. A practical approach to using milk fats as ingredients is therefore based on understanding the background science and technology of milk fats, and on appreciating where the attributes of milk fat in its various forms can deliver real benefits to food manufacturers. These considerations have been addressed in three key areas: what are the characteristics of milk fats; how can the properties of milk fats be modified; and what are the typical milk fat ingredients and their applications.     

Structural, Mechanical and Erosion Properties of Yttrium Oxide Coatings by Axial Suspension Plasma Spraying for Electronics Applications

Yttrium oxide (Y₂O₃) coatings have been prepared by axial suspension plasma spraying with fine powders. It is clarified that the coatings have high hardness, low porosity, high erosion resistance against CF₄ -containing plasma and retention of smooth eroded surface. This suggests that the axial suspension plasma spraying of Y₂O₃ is applicable to fabricating equipment for electronic devices, such as dry etching. Surface morphologies of the slurry coatings with splats are similar to conventional plasma-sprayed Y₂O₃ coatings, identified from microstructural analysis. Dense coating structures with no lamellar boundaries have been seen, which is apparently different from the conventional coatings. It has also been found that crystal structure of the suspension coatings mainly composed of metastable monoclinic phase, whereas the powders and the conventional plasma spray coatings have stable cubic phase. Mechanism of coating formation by plasma spraying with fine powder slurries is discussed based on the results.     

Bifunctional trehalose anode incorporating two covalently linked enzymes acting in series

A bienzymatic electrode incorporating trehalase (Tre) and glucose oxidase (GOx) covalently bound to the surface of Pt through a functionalized thiol linker (Tre|GOx|Pt) has been designed and assembled and its catalytic properties examined by chemical and electrochemical methods in aqueous phosphate buffer solutions (PBS, pH 7.4). Exposure of Tre|GOx|Pt to PBS containing trehalose (Tr) and subsequent polarization at 0.6 V versus Ag/AgCl yielded after a few minutes well-defined steady-state currents ascribed to the oxidation of hydrogen peroxide generated by the GOx-mediated oxidation of glucose (Gl) produced by the Tre-mediated dissociation of Tr. Plots of the steady-state currents versus [Tr] over the range examined, i.e., 5-25 mM, were found to be linear. Implications of these results toward the development of an implantable biofuel cell as an autonomous energy conversion device for insects are discussed.