Michael D. Bryant

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OBJECTIVES To study the hypothesis that patients with urolithiasis would have a higher prevalence of depression compared to the general population. Urolithiasis is associated with frequent recurrences. Patients with urolithiasis may develop a chronic condition associated with poor quality of life and depression. The frequency and severity of stones episodes(More)
PURPOSE Urolithiasis is a common urological condition that causes significant pain and suffering. Until recently few studies had been done to examine how quality of life is affected in stone formers. We hypothesized that patients with multiple recurrent episodes of urolithiasis have worse health related quality of life. Thus, we identified specific factors(More)
An existing bond graph of a squirrel cage induction motor was modified to make the bond graph physically more representative. The intent was to form a one-to-one correspondence between motor components and bond graph elements. Components explicitly represented include the stator coils, the squirrel cage rotor bars, and the magnetic flux routing section. The(More)
Hydrodynamic performance of gas microbearings, fabricated with deep X-ray lithography and electroplating, will be presented in this article. Static performance in terms of load parameters and attitude angles was calculated using Molecular Gas Lubrication (MGL) theory. Threshold speed and allowable rotor mass were calculated to investigate safe operating(More)
PURPOSE Low health literacy is a significant problem in the United States. At the same time written screening tools such as the American Urological Association symptom score are used more frequently at hospitals and clinics. We previously reported that many patients do not fully understand this tool and often provide inaccurate information. To combat this(More)
Lumped parameter models can not sufficiently describe dynamics of many distributed systems, such as a continuous rotating shaft with bending. The finite element method is employed to embed distributed dynamics of rotating shafts with bending into constitutive laws of bond graphs resulting a finite element bond graph model. Defining the nodal displacements,(More)
Multibody dynamics of healthy and faulty rolling element bearings were modeled using vector bond graphs. A 33 degree of freedom (DOF) model was constructed for a bearing with nine balls and two rings (11 elements). The developed model can be extended to a rolling element bearing with n elements and ͑3 ϫ n͒ DOF in planar and ͑6 ϫ n͒ DOF in three dimensional(More)