Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"interface pressure"”.
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Effects of a powered ankle prosthesis on shock absorption and residual limb/socket interface pressure
… both limbs, and discomfort at the stump/socket interface. State of the art; passive prostheses have improved many negative consequences associated with lower-limb loss, but we believe the limit of uninformed elastic prostheses has been reached. Further strides require a more biomimetic approach. …
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An investigation into interface pressure (ip) risk of healthy volunteers on modern medical imaging and radiotherapy tables
Background and RationalePressure ulcers (PUs) present significant threats to patients and cost billions of total healthcare expenditure. In radiography/radiotherapy, a potential for high interface pressure (IP) on radiography/radiotherapy tables may exist, however no study has investigated this to …
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Compression under pressure: physiological and methodological factors influencing the effect of compression garments on running economy
… of exercise, type of garment worn, and the interface pressure produced by the garment. The interface pressure applied by compression clothing is an important measure in evaluating the bio-physical impact of compression. Interface pressure values obtained in vivo with two portable pressure …
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A Wearable Device to Inform Pressure Injury Prevention Support Surfaces Selection and Design
Pressure injuries are a preventable but persistent medical challenge, with 2.5 million Americans developing pressure injuries each year. Pressure injuries are uniquely challenging to manage for wheelchair users, who have to sit for extended periods of time, up to 10-12 hours per day. Measuring the …
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An integrated human factors approach to design and evaluation of the driver workspace and interface: Driver perceptions, behaviors, and objective measures
An ergonomic driver workspace and interface design is essential to ensure a healthier and comfortable driving experience in terms of driver perceptions, postures, and interface pressures. Developing more effective methods for driver-side interior design and evaluation, hence, requires thorough …
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Advanced prototyping of variable impedance prosthetic sockets for trans-tibial amputees : polyjet matrix 3D printing of comfortable prosthetic sockets using digital anatomical data
… into a 3D printed socket to achieve lower interface peak pressures over bony protuberances by using anthropomorphic data acquired through surface scanning and magnetic resonance imaging techniques. An inverse linear mathematical transformation spatially maps quantitative measurements (bone …
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Enhanced comfort of seating systems through variable shape and compliance
… cushion is intended to optimally distribute the interface pressure on the seat of a wheelchair user, as well as to provide an opportunity for active pressure management. The principal goal in developing this cushion is the prevention of pressure sores (decubitis ulcers). The theoretical and …
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The design and performance of a low-cost inflatable wheelchair seat cushion
… cushions is vital to preventing life-threatening pressure sores, but high quality air cushions are often too expensive and inaccessible for many people. Given the prevalence of pressure sores, there is a need for a more accessible alternative to expensive air cushions. The design of a low-cost …
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Press fit design : force and torque testing of steel dowel pins in brass and nylon samples
… press fit theory well suggesting that the interface pressure of the press fit can be accurately predicted by theory. The brass torque samples matched theory well once material yield conditions were taken into account. The creep sensitivity of the nylon samples made predictions over the …
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Characterizing the Thermal Behavior of Pyrolytic Graphite Sheets (PGS) at Low Interface Pressures
… has led the Navy to pursue the design of a dry interface liquid cooling system to cool the iPEBB. This means that no liquid can cross the boundary of the iPEBB and thus the cooling system must be separate. In this thesis, an integral portion of the dry interface cooling solution, the thermal …
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A new standard in testing mattresses for use in x-ray imaging : developing, validating and using a novel method to test x-ray mattresses for pressure ulcer development, radiation dosimetry and image quality
… should be constructed in such a way that interface pressure (IP) is minimized, limiting the chance of pressure ulcer formation. Aim For evaluating X-ray imaging table mattresses, this thesis has three aims (1). to develop and validate an anthropomorphic-phantom-based method of assessing …
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Numerical simulation of an English equestrian Saddletree
… for a jumping horse, saddletree test data, and, interface contact measurements acquired using a pressure mat. In addition, material properties data were obtained from available literature. Nonlinear static numerical models were subsequently developed and parametric studies were performed to …
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Performance evaluation of an ensemble neural network system of estimating transtibial prosthetic socket pressures during standing, walking and condition perturbation.
… this link, systems of measuring stump-socket interface pressure have not seen use in clinical practice, in part due to limitations in functional performance. A technique using neural networks to relate external socket deformation to the internal pressure distribution was recently developed: …
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The prediction of metal flow and properties in three-dimensional forgings using the finite element period.
… and distributions of hardness and die-interface pressure, predicted by this technique for the unlubricated upsetting of a rectangular block are compared with experimental results, and found to be in broad agreement, the differences being attributed to the incorrect imposition of very …
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Pressure ulcer risk assessment and prevention system design.
Pressure ulcer (PU, bedsore, ischemia, decubitus ulcer) has become a global healthcare problem. In United Kingdom 412,000 people develop pressure ulcer annually and it costs the National Health Service (NHS) £1.4-£2.1 billion pounds (4% of total NHS budget). Pressure ulcers are a combined result of …
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Oxygen Deficient Metabolism in Organs: A Link to Combustion Science
… with COS models. B) Measured capillary-IF interface pressure of O2 (pO2,cap-IF) for rat mesentery system as given by Tsai et. al. is about 38 mmHg while predicted pO2,cap-IF is 54.5, 38.1, 55.3 and 46.2 mmHg for COA-O2, COS-O2, COA-US and COS-US respectively. C) Further, SMR for the average …
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Local plastic deformation in pressure and tensile armour layers of flexible risers
… carbon steel interlocked circumferential pressure armour layer for resisting internal pressure loads, helically wound carbon steel tensile armour layers to resist axial loads and a watertight external sheath. Much of the analytical work that has been carried out on flexible composite pipe …
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A study of vibration response characteristics of the human hand-arm system
… mechanical impedance; (ii) study of hand-grip pressure distribution to gain an insight to a probable mechanism leading to VWF disease; (iii) study of electromyography of finger flexor muscles to enhance an understanding of the vibration induced loss of muscle and grip strength; and (iv) study …
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Experimental investigations and finite element analyses of interface heat partition in a friction brake system. New modelling paradigm for describing friction brake systems to support studies of interface temperature, contact pressure, heat flux distribution and heat partition ratio by experiment and FE simulation
… present work investigates the effect on disc/pad interface temperature and pressure distributions of limited relaxations of this rotational restriction. Models are proposed, developed and validated that facilitate different rotational degrees of freedom (DoF) of the pad. An important influencing …
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NUMERICAL METHODS FOR MULTIPHASE FLOWS: FROM A SIMPLIFIED INCOMPRESSIBLE BAER-NUNZIATO MODEL TO A UNIFIED THEORY OF COMPRESSIBLE MULTIPHASE FLUID AND SOLID MECHANICS
… mixture models, which are based on the diffuse interface approach. One of the most established ones is the Baer-Nunziato (BN) model. Due to its relatively simple mathematical structure, it is possible to derive reduced models, such as a model for incompressible two-phase flows, with …