The stability theory of solutions to partial differential equations - A bibliographical survey

Bibliographical survey of research on stability theory of solutions to partial differential equation

Hands-off and hands-on casting consistency of amputee below knee sockets using magnetic resonance imaging

Residual limb shape capturing (Casting) consistency has a great influence on the quality of socket fit. Magnetic Resonance Imaging was used to establish a reliable reference grid for inter cast and intra cast shape and volume consistency of two common casting methods, Hands-off and Hands-on. Design: Residual limbs were cast for twelve people with a unilateral below knee amputation and scanned twice for each casting concept. Subsequently, all four volume images of each amputee were semi-automatically segmented and registered to a common coordinate system using the tibia and then the shape and volume differences were calculated. Results: The results show that both casting methods have intra cast volume consistency and there is no significant volume difference between the two methods. Inter and intra cast mean volume differences were not clinically significant based on the volume of one sock criteria. Neither the Hands-off nor the Hands-on method resulted in a consistent residual limb shape as the coefficient of variation of shape differences was high. Conclusion: The resultant shape of the residual limb in the Hands-off casting was variable but the differences were not clinically significant. For the Hands-on casting, shape differences were equal to the maximum acceptable limit for a poor socket fit

Examination of anticipated chemical shift and shape distortion effect on materials commonly used in prosthetic socket fabrication when measured using MRI: a validation study

The quality of lower-limb prosthetic socket fit is influenced by shape and volume consistency during the residual limb shape-capturing process (i.e., casting). Casting can be quantified with magnetic resonance imaging (MRI) technology. However, chemical shift artifact and image distortion may influence the accuracy of MRI when common socket/casting materials are used. We used a purpose-designed rig to examine seven different materials commonly used in socket fabrication during exposure to MRI. The rig incorporated glass marker tubes filled with water doped with 1 g/L copper sulfate (CS) and 9 plastic sample vials (film containers) to hold the specific material specimens. The specimens were scanned 9 times in different configurations. The absolute mean difference of the glass marker tube length was 1.39 mm (2.98%) (minimum = 0.13 mm [0.30%], maximum = 5.47 mm [14.03%], standard deviation = 0.89 mm). The absolute shift for all materials was <1.7 mm. This was less than the measurement tolerance of +/–2.18 mm based on voxel (three-dimensional pixel) dimensions. The results show that MRI is an accurate and repeatable method for dimensional measurement when using matter containing water. Additionally, silicone and plaster of paris plus 1 g/L CS do not show a significant shape distortion nor do they interfere with the MRI image of the residual limb

Need, prevention, barriers and impact : a physical health technology perspective for low-income countries

This presentation looks at need, prevention, barriers and impact from a a physical health technology perspective for low-income countrie

Pilot study : a comparison between a hands-on and a hands-off socket design, using fixed socket fit criteria and dynamic stump/socket interface pressure measurements

The research of existing and the development of new trans-tibial socket concepts are on the agenda of most researchers and clinicians in this field. However, the understanding of the mechanisms contributing to a 'good fit' concept is hampered by the complexity of soft tissue behaviour as the load transferring medium within the socket. There is also a lack of consensus on the description of a good fit. There is no doubt that advances in relation to fitting techniques have been made, but to what extent those advances contribute to enhanced quality of fit is uncertain

De madres, ciudades y tablillas: Alcances políticos y literarios de un enigma familiar en la Comedia Media (Antífanes, Safo, fr. 194 K.-A.)

El fragmento 194 (Kassel-Austin) del poeta cómico Antífanes, proveniente de su obra Safo (c. 360 a.C.), reproduce un diálogo entre la poetisa y un personaje desconocido que da cuenta de una adivinanza. La imagen propuesta de una mujer que protege a sus hijos, silenciosos, mientras lloran ante quien los quiera escuchar es, pues, resemantizada en el pasaje, a la vez, desde una dimensión política y un plano autorreferencial. Examinada inicialmente como una pólis que cobija a los demagogos corruptos, la escena familiar termina siendo decodificada en términos poéticos: se trata de un tablilla de escritura con letras que resultan sus mudos descendientes. El enigma, por tanto, supone una interesante estrategia para consolidar desde una visión cómica la polivalencia de la imagen maternal como un mecanismo metafórico eficiente para cargar las tintas sobre aquellas temáticas a las que el género concede un tratamiento privilegiado.The fragment 194 (Kassel-Austin) of the comic poet Antiphanes, from his play Sappho (c. 360 BCE), reproduces a dialogue between the poetess and an unknown character related to a riddle. The suggested image of a woman keeping his silent children safe while they cry loud to those who want to listen is re-signified in the passage from both a political and a self-referential level. Initially understood to be a pólis protecting her corrupt demagogues, the family scene is finally explained in terms of a writing tablet with letters seen as its mute children. The riddle, therefore, becomes an interesting strategy in order to consolidate, from a comic standpoint, the polyvalence of the maternal image as aefficient metaphorical mechanism capable of addressing those issues which are the main topics of the genre.Fil: Buis, Emiliano Jerónimo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentin