Browsing by Subject "Force and energy"

Filter results by typing the first few letters
Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    A Novel Approach to Automate Measurement and Training of Hand and Wrist Motor Functions
    (2018-08) Grasse, Katelyn Millay
    Millions of people around the world suffer chronic upper extremity disability. Reliable measurement of arm function is critical for development of therapies to improve recovery after impairment. In this study, we report a suite of automated rehabilitative tools to allow simple, quantitative assessment of hand and wrist motor functions. We measured range of motion and force production using these devices in cSCI participants with a range of upper limb disability and in neurologically intact participants at two time points separated by approximately four months. Additionally, we determined whether measures collected with the rehabilitative tools correlated with standard upper limb assessments, including the Graded Redefined Assessment of Strength, Sensibility, and Prehension (GRASSP) and the Jebsen Hand Function Test (JHFT). We find that the rehabilitative devices provide sensitive, accurate assessment of upper limb function in physical units over time in SCI participants and are well-correlated with standard assessments. These results indicate that these tools represent a reliable system for longitudinal evaluation of upper extremity function after cSCI and may provide a framework to assess the efficacy of strategies aimed at improving recovery of upper limb function. Finally, we demonstrate the feasibility of using the system with video games to deliver automated repetitive motor therapy.
  • No Thumbnail Available
    Item
    Design and analysis of wheel hub to provide in-hub electric motor for HMMWV vehicle
    (Texas Tech University, 2004-05) Thakur, Sandeep Singh
    This thesis describes the design of the wheel hub of hybrid HMMWV so as to introduce an electric in-hub motor inside the hub. Chapter I explains the consumption and detrimental effect of fossil fuels. Limitations of present alternative fuels are also explained. In Chapter 2 deals with hybrid electric vehicle concept, various types and configurations and the different military hybrid vehicles. In subsequent chapters vehicle performance characteristics such as velocity, acceleration and gradability are studied for different cases and gear ratio calculation is explained. Design constraints are listed and design was done based upon available space and taking weight factor into consideration. Further, the design was tested for the vehicle crushing forces known as 20G and 8G forces. High strength steel was used as the material for the design. Results are verified with available data for strength of the design. The Von Mises stresses are less than yield stresses in all the cases. Nodal displacements are within the acceptable range. Pro E is used for modeling the components and Algor is used for analysis.
  • No Thumbnail Available
    Item
    Ignition studies of Al-Fe203 energetic nanocomposites
    (Texas Tech University, 2004-12) Patibandla, Sridhar
    Energetic nanocomposites are materials consisting of both fuel and oxidizer elements with at least one constituent in the nanometer size range. When ignited they react exothermically and release large amounts of energy, much larger than that compared with bulk materials. In this work, a new kind of energetic nanocomposite, a nanowire array-based thin film is reported. The nanocomposite consists of oxidizer (or fuel) nanowires embedded in a thin fuel (or oxidizer) film. Such nanocomposites are reported for the first time. In this thesis, energetic nanocomposites of the type Al-Fe2O3 are prepared. Fe203 is in the form of nanowire arrays prepared using nanoporous alumina membranes. AI film is in the form of a thin film prepared by vacuum deposition. Nanowires with two different dimensions are studied, namely l0nm and 50nm. Thickness of the Al film is 50nm. The wires are either embedded perpendicularly (stmctured nanocomposite) in the Al film or randomly distributed (random nanocomposite) on the Al film. All of these samples are found to demonstrate ignition. This thesis describes the complete fabrication process for the nanocomposites. Demonstration of ignition in these nanocomposites is described. Experimental procedure to measure the ignition properties is discussed and an estimate of the energy released is presented.
  • No Thumbnail Available
    Item
    The electrodynamics of spatially stationary objects
    (Texas Tech University, 1981-05) Neacsu, Michael Alexander
    Not available