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This paper describes the novel development of micro-scale structures and micro-electromechanical systems (MEMS) composed of polydimethylsiloxane, moldable polymer, whose optical properties have been tailored to suit different applications. By doping the polymer with a photo-absorbing material, its optical properties were altered depending on the application. The development of such doped polymer microstructures...
The development of micro-electromechanical systems (MEMS) is based on the fabrication of microscale structures and features in a photo-sensitive polymer or photoresist, by selectively exposing it to ultra-violet (UV) light. The standard UV sources used in MEMS fabrication have broadband UV light output in the range of 305 nm to 436 nm. The use of such sources causes problems in some situations due...
It is a challenging problem to derive closed-form solution of inverse kinematics of the humanoid robot fingers with nonlinearly coupled joints. This paper presents a novel quasi-closed-form solution of inverse kinematics for such fingers. On the assumption that the angles of the two coupled joints are equal, an approximate closed-form solution of fingertips inverse kinematics is derived firstly. Utilizing...
This paper demonstrates the integration of Au nanocrystals (NCs) into nonvolatile metal-oxide-semiconductor (MOS) with a hybrid method operated at room temperature. The comparison of structural and electrical characteristics between the hybrid Au NCs fabricated by chemical syntheses and film deposition Au NCs fabricated by rapid thermal annealing (RTA) was carried out. The size of the Au NCs formed...
Dynamic stress effect on LDMOS RF performances have been evaluated. Measured S21 shows less degradation subject to dynamic stress than DC stress. RF power amplifier's output power and power-added efficiency degrade after dynamic hot electron stress.
In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage...
Based on the underactuated mechanism and coupling principle, a five-fingered prosthetic hand is presented in this paper. The design of the finger is based on two types of four-bar linkage mechanisms. One is the underactuated linkage mechanism, which implements self-adapt grasp with wide variety of objects placed between base joint and middle joint. The other is the coupling linkage which employs between...
This paper gives an overview of the Chinese intelligent space robotic system. The system consists of a 6 DOF robot arm, a large-error tolerated gripper with two stereo cameras and onboard computer. The robot arm is composed of six identical modular joints, a big central hole in the modular joint was designed for the placement of the cables and plugs in the robot arm, which prevented them from damage...
In this paper, a novel hierarchical capacitance extraction method is introduced. It takes advantage of surface integral equations to have far less unknowns than the volumetric method. It uses the "divide and conquer" strategy to hierarchically solve the dense capacitance matrix efficiently. It partitions the problem into small regions (cells) automatically and each region is analyzed separately...
Fast integral equation methods are now being applied to packaging and other such "low frequency" problems. This paper explores some of the issues surrounding such an application to real, product level packaging and interconnects type structures. Discussed are issues such as low frequency breakdown, mesh aspect ratios, and solver convergence. Finally, integral equation solver examples are...
Based on under-actuated mechanism and coupling principle, a five-fingered, multi-sensory and biomechatronic prosthetic hand has been designed. The multi-DOF hand comprises 13 joints and is controlled by 3 motors. Actuated by only one motor, the thumb can move along a cone surface which is superior in the appearance. Also driven by one motor and transmitted by springs, the mid finger, the ring finger...
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