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We report a laser-ablation aided, direct-write fabrication technique that could convert non-conductive paper rinsed with metal ions and polymer solution into conductive metal carbide and graphene with a typical sheet resistance of 45.3 Ω/□. As fabricated paper electronics inherit the microfiber network from paper and have nanoscale pores and 2D metal carbide flakes due to the laser ablation process...
The detection of a small number of molecules in miniature amount of solution is of pivotal significance in many applications including biomedicine, homeland security, forensics, and environmental protection. Surface-Enhanced Raman scattering (SERS) offers the potential for label-free sensing of many chemicals due to its unprecedented sensitivity and specificity. However, the performance of SERS sensing...
In this paper, we propose a formation control algorithm for multi-agent systems to achieve prospected formation shape and track reference trajectory. We assume the description of formation and reference velocity is known to all agents. For second-order dynamics, we present a strategy that allows all agents to maneuver to desired scaled formation during tacking leader's movements. Finally, simulation...
This paper briefly mentions the micro controller unit, and then goes into details about the exact regulations for SRM. Firstly, it proposes the main driving state control for motor and the importance of the motor position sensor. For different speed, the controller will choice various styles such as voltage chopper control, angle position control and current chopper control for which owns its advantages...
In this contribution we describe recent progresses on ultra-sensitive chemical sensing in the mid-infrared (MIR; 3–20 μm) spectral range combining microfabricated thin-film GaAs/AlGaAs and HgCdTe waveguides with quantum cascade lasers (QCL). Epitaxial grown methods including molecular beam epitaxy (MBE) and metal-organic vapor-phase epitaxy (MOVPE) were applied facilitating the growth of 6 μm thin...
An immunoassay based on surface-enhanced Raman scattering has been developed using diatom frustules to detect antigens with high sensitivity. It was found that the diatom frustules provide 6× higher sensitivity than traditional glass substrates.
A control system with a cascaded structure based on PD control is developed to control balance and direction of an autonomous bicycle test platform equipped with roll angle, yaw rate sensors and a microcontroller. Besides stabilizing the platform at the upright position, non-zero equilibrium roll angle control for directional control is also considered. The controller design for the test platform...
Today, most autonomous mobile robots rely on centralized perception and processing. They are, however, facing difficulties to be reliable and efficient due to uncertainties introduced from dynamic environments. In this paper, an intelligent environment with distributed visual sensors to support navigation and control of mobile robots, wireless mosaic eyes, is reported. The distributed visual sensors...
This paper presents a new impulse based ultra-wide band (UWB) transceiver system designed in 90nm CMOS technology for UWB medical radar sensing and communication applications. The design is targeting for human heart motion detection and short range data communications. The transmitter is composed of a simple on-off keying (OOK) modulated impulse generator and a variable gain-controlled amplifier (VGA)...
This paper presents a novel phase current reconstruction scheme using the information obtained from shunt resistors (in series with low-side switches in a conventional three-phase inverter) for closed-loop current control in low-cost PMSM drives. A state observer is developed for reconstructing phase currents when they cannot be directly measured only in a portion of fundamental period due to the...
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