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Social Security: Raising or Eliminating the Taxable Earnings Base

Description: This report discusses the Social Security taxes that are levied on covered earnings up to a maximum level (base) set each year. It includes information about how the base has been determined demographically and how it has changed over time, as well as possible future implications and impacts of either raising or eliminating the base, with arguments for and against.
Date: October 26, 2018
Creator: Li, Zhe
Partner: UNT Libraries Government Documents Department

A new class of high force, low-voltage, compliant actuation system

Description: Although many actuators employing electrostatic comb drives have been demonstrated in a laboratory environment, widespread acceptance in mass produced microelectromechanical systems (MEMS) may be limited due to issues associated with low drive force, large real estate demands, high operating voltages, and reliability concerns due to stiction. On the other hand, comb drives require very low drive currents, offer predictable response, and are highly compatible with the fabrication technology. The expand the application space and facilitate the widespread deployment of self-actuated MEMS, a new class of advanced actuation systems has been developed that maintains the highly desirable aspects of existing components, while significantly diminishing the issues that could impede large scale acceptance. In this paper, the authors will present low-voltage electrostatic actuators that offer a dramatic increase in force over conventional comb drive designs. In addition, these actuators consume only a small fraction of the chip area previously used, yielding significant gains in power density. To increase the stroke length of these novel electrostatic actuators, the authors have developed highly efficient compliant stroke amplifiers. The coupling of compact, high-force actuators with fully compliant displacement multipliers sets a new paradigm for highly integrated microelectromechanical systems.
Date: April 10, 2000
Creator: RODGERS,M. STEVEN; KOTA,SRIDHAR; HETRICK,JOEL; LI,ZHE; JENSEN,BRIAN D.; KRYGOWSKI,THOMAS W. et al.
Partner: UNT Libraries Government Documents Department