Patients with severe action tremor have uncontrollable, relatively rapid oscillatory motion super... more Patients with severe action tremor have uncontrollable, relatively rapid oscillatory motion superimposed on otherwise useable slower voluntary motor activity. Because a mechanical damper produces an opposing force proportional to velocity, applying damping loads to tremorous limbs should attenuate the (high-velocity) tremor component of movement while permitting the slower purposeful portion to proceed relatively unopposed. In this study, the effect of upper extremity damping in three degrees of freedom was examined in 10 patients with cerebellar action tremor due to multiple sclerosis or traumatic brain injury. Variable amounts of damping were applied by prototype energy-dissipating orthoses which generated resistive viscous loads by means of computer-controlled magnetic particle brakes. All patients experienced statistically and functionally significant tremor reduction with the application of damping.
An HK40 steam-reforming tube that ruptured after 35,000 h of operation was analyzed to identify t... more An HK40 steam-reforming tube that ruptured after 35,000 h of operation was analyzed to identify the causes of failure. Analysis of the fracture surface and cross sections indicated extensive and localized corrosion associated with the primary crack site. The fracture surface showed three distinct types of propagation morphology at the inner, middle, and outer portions of the pipe. Severe localized corrosion at interdendritic grain boundaries was detected at the inner pipe, while at the middle, cracks propagated transgranularly along primary carbides. Elemental mapping and line profiles showed a correlation between rupture behavior and the elemental segregation of chromium, manganese, carbon, and silicon at the inner and middle regions. Sulfur, encountered as a contaminant in natural gas, was also detected at these regions. Based on the characteristics exhibited by the fracture surface, failure was attributed to oxidation and fracture enhanced by the elemental redistribution of chromium, carbon, manganese, nickel, and silicon.
The dynamic response is an important consideration when designing and controlling manipulators. T... more The dynamic response is an important consideration when designing and controlling manipulators. This dynamic response can be better understood with the explicit equations of motion. This paper presents the derivation of the explicit equations of motion for a parallel manipulator using Kane’s Method. These equations illustrate the high degree of coupling existing in this type of manipulator. A simulation program is developed with the equations of motion and used for the inverse dynamic analysis of the system. The results of the tests indicate that the most important coupling effect is caused by gravity.
Proceedings of the 2010 IEEE International Symposium on Sustainable Systems and Technology, 2010
Transitioning to an infrastructure that integrates a more substantial portion of renewable energy... more Transitioning to an infrastructure that integrates a more substantial portion of renewable energy sources into the larger energy portfolio is not effortless or without sacrifice; it has economic, technical as well as social challenges related to the decisions, choices and consequences in trying to establish new energy systems. Those decisions, choices and consequences are highly dependent on the social, economical
For years universities have recognized that areas such as environmental protection and sustainabi... more For years universities have recognized that areas such as environmental protection and sustainability are important, creating related courses and academic programs. What many universities have not yet done is to consciously examine how they fulfill their academic mission and what effect do their operations have on the environment. Conducting university operations in an environmentally sound manner can be a powerful teaching tool. Setting the example and teaching by doing can be more powerful that the best lecture. An Environmental Management System is a set of policies, plans, review mechanisms, and procedures used to proactively manage the environmental aspects of an organization. The creation and implementation of an EMS requires the completion of the following steps - defining an environmental policy; planning what aspects will be managed; implementing the system with roles, responsibilities, documentation; checking if the aspects are being managed correctly; and having upper man...
Patients with severe action tremor have uncontrollable, relatively rapid oscillatory motion super... more Patients with severe action tremor have uncontrollable, relatively rapid oscillatory motion superimposed on otherwise useable slower voluntary motor activity. Because a mechanical damper produces an opposing force proportional to velocity, applying damping loads to tremorous limbs should attenuate the (high-velocity) tremor component of movement while permitting the slower purposeful portion to proceed relatively unopposed. In this study, the effect of upper extremity damping in three degrees of freedom was examined in 10 patients with cerebellar action tremor due to multiple sclerosis or traumatic brain injury. Variable amounts of damping were applied by prototype energy-dissipating orthoses which generated resistive viscous loads by means of computer-controlled magnetic particle brakes. All patients experienced statistically and functionally significant tremor reduction with the application of damping.
An HK40 steam-reforming tube that ruptured after 35,000 h of operation was analyzed to identify t... more An HK40 steam-reforming tube that ruptured after 35,000 h of operation was analyzed to identify the causes of failure. Analysis of the fracture surface and cross sections indicated extensive and localized corrosion associated with the primary crack site. The fracture surface showed three distinct types of propagation morphology at the inner, middle, and outer portions of the pipe. Severe localized corrosion at interdendritic grain boundaries was detected at the inner pipe, while at the middle, cracks propagated transgranularly along primary carbides. Elemental mapping and line profiles showed a correlation between rupture behavior and the elemental segregation of chromium, manganese, carbon, and silicon at the inner and middle regions. Sulfur, encountered as a contaminant in natural gas, was also detected at these regions. Based on the characteristics exhibited by the fracture surface, failure was attributed to oxidation and fracture enhanced by the elemental redistribution of chromium, carbon, manganese, nickel, and silicon.
The dynamic response is an important consideration when designing and controlling manipulators. T... more The dynamic response is an important consideration when designing and controlling manipulators. This dynamic response can be better understood with the explicit equations of motion. This paper presents the derivation of the explicit equations of motion for a parallel manipulator using Kane’s Method. These equations illustrate the high degree of coupling existing in this type of manipulator. A simulation program is developed with the equations of motion and used for the inverse dynamic analysis of the system. The results of the tests indicate that the most important coupling effect is caused by gravity.
Proceedings of the 2010 IEEE International Symposium on Sustainable Systems and Technology, 2010
Transitioning to an infrastructure that integrates a more substantial portion of renewable energy... more Transitioning to an infrastructure that integrates a more substantial portion of renewable energy sources into the larger energy portfolio is not effortless or without sacrifice; it has economic, technical as well as social challenges related to the decisions, choices and consequences in trying to establish new energy systems. Those decisions, choices and consequences are highly dependent on the social, economical
For years universities have recognized that areas such as environmental protection and sustainabi... more For years universities have recognized that areas such as environmental protection and sustainability are important, creating related courses and academic programs. What many universities have not yet done is to consciously examine how they fulfill their academic mission and what effect do their operations have on the environment. Conducting university operations in an environmentally sound manner can be a powerful teaching tool. Setting the example and teaching by doing can be more powerful that the best lecture. An Environmental Management System is a set of policies, plans, review mechanisms, and procedures used to proactively manage the environmental aspects of an organization. The creation and implementation of an EMS requires the completion of the following steps - defining an environmental policy; planning what aspects will be managed; implementing the system with roles, responsibilities, documentation; checking if the aspects are being managed correctly; and having upper man...
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Papers by Ivan Baiges