Applied Mechanics and Materials Vol. 742

Abstract: As scaling down of CMOS transistor’s channel length is done for miniaturization, the design community primarily focuses on the high performance & power-aware design. The power consumption of any circuit solely holds the performance and the life of it. But static power consumption deteriorates them and dominates the dynamic power consumption because of its leakage components. A modified approach of pulse triggering in the Power Gating technique called MPG (Modified Power Gating) is proposed to reduce the static power consumption (leakage power) of digital subsystems. Sub threshold leakage power of MPG Inverter (INV) and 32-bit Digital Comparator (DC) is analyzed and reduced with 35% to 40% leakage savings compared with conventional and existing techniques by simulating it in Cadence GPDK.

Abstract: When hump field is in humping operation, for some reasons there will be an illusion that the section is switched ahead of time, which causes that the section gets the next order to switch on the way while the train is still in the section without clearing rail of the column, posing risks to the safe running of the humping hook vehicles. The above problems will be discussed and solutions for the switch due to the hump error will be raised.

Abstract: A theoretical model of Si-based P-N junction isotope microbattery’s electrical output was demonstrated. According to the model, electrical output performance of a 1*1 mm² Si-based isotope microbattery under the irradiation of a 1 mCi ⁶³Ni source was simulated. The optimal doping concentration was obtained when the microbattery had the maximum output power density of 0.95 nW/cm².

Abstract: A new control scheme with self-adaption is put forward in this paper. The digital control and the analog circuit are combined. A light intensity sensor can be implemented with a photoelectric triode. This sensor makes the self-adaptation control of LED possible. As a result, the light of LED can be adjusted automatically with a PWM chopper according to the ambient brightness. The whole system’s power supply is from a Boost converter which has a high efficiency. In addition, This combination improves the hommization of the system and solves the problems existing incurrent headlamps, unsafe factors are also reduced. The validity of design is verified by experimental results.

Abstract: In order to achieve different response indifferent moment of fuel Injection Solenoid, a driving mode of Peak&Hold is generally applied to electronic control fuel injection system of the diesel engine. The theoretical analysis of high speed response and duplicate supply drive circuit based on the energy recovery is made, and a theoretical guidance for optimization design is presented. According to an electronic unit pump developed by ourselves, the optimization design of drive circuit for the fuel injection system is done. The results showed that during the process of injection, the time of current of solenoid valve form 0 to 20A is 224, and the turn-off time is 120which is a little longer than that of the high speed circuit based on the avalanche. And the turn-off time is met the requirement of control precision. With many advantages, such as energy saving and heat reducing, the high speed response and duplicate supply drive circuit based on the energy recovery will become a good choice in electronic control fuel injection system.

Abstract: A dielectric resonator antenna with special shape for camouflage in the city is proposed in this paper. A series of antennas with different materials and shapes chosen from the normal building were made and analyzed. It was found that electrical properties of the antennas were extremely affected by shapes of the antenna and locations of the tap. Based on the results, a dielectric resonator antenna with return loss >-20dB, peak gain >6 dBi at 1.275 GHz was demonstrated. This technique will allow the design and installation of dielectric resonator antenna with good electrical properties for camouflage in the city .

Abstract: The purpose of this work is to study the mechanical characteristics of the silicon nitride(SiN_x) thin films prepared by PECVD technique, some researches as follows were carried out. First, the SiNx thin films were deposited on the two different substrates. Then, the atomic force microscope (AFM) was adopted to test the surface quality of the SiN_x films, and the scanning electron microscope (SEM) was used to test the section morphology of the SiN_x thin films. Finally, the rotating beam structures was applied to measure the residual stress in the SiNx films. The SiN_x thin films with low stress can be fabricated through PECVD, in which the surface roughness values(Ra) are 1.261 nm and 2.383nm, and the residual stress is 43.5 kPa. Therefore, the SiN_x thin films deposited by PECVD are suitable for the preparation of device dielectric films in MEMS.