1D nano-material-based flexible devices has attracted considerable attention owing to the growing need of the
high-sensitivity flexible sensor, portable consumer electronics etc.. In this paper, the 1D nano-materials-based
flexible device on polyimide substrate was proposed. The bottom-up and top-down combined process were
used for constructing the ZnO nanowire and the CNT-based flexible devices. Their electrical characteristics
were also investigated. The measurement results demonstrate that the flexible device covered with a layer of
Al2O3 has good ohm electrical contact behavior between the nano-material and micro-electrodes. The
proposed 1D nano-material-based flexible device shows the application potential in the sensing fields.
In recent years, many kinds of 1-dimension nano-materials (Carbon nanotube, ZnO nanobelt and nanowire
etc.) continue to emerge which exhibit distinct and unique electromechanical, piezoelectric, photoelectrical
properties. In this paper, a 1-dimension nano-materials-based device was proposed. The bottom-up and
top-down combined process were used for constructing CNT-array-based device and ZnO nanowire device.
The electrical characteristics of the 1D nano-materials-based devices were also investigated. The
measurement results of electrical characteristics demonstrate that it is ohm electrical contact behavior between
the nano-material and micro-electrodes in the proposed device which also have the field effect. The proposed
1D nano-material-based device shows the application potential in the sensing fields.
The researches of single cell's control and operation are the hotspots in whole world. Among the various technologies,
the transmission of ectogenic genetic materials between cell membrane is very significant. Imitating the Chinese
traditional acupuncture therapy, a new ultrasonic resonance driving method, is imported to drive a cell's penetration
probe. A set of the single cell penetration system was established to perform this function. This system includes four
subsystems: driving part, micromanipulation part, observation and measurement part, and actuation part. Some fish egg
experiments indicate that this system is workable and effective.
We present simulation and experimental studies of a piezoelectrically actuated microdiaphragm air pump, which is characterized by thin structure, large flow, and low power consumption. A novel large-displacement actuation structure is designed for the air pump. A prototype of the micro air pump is fabricated by precise fabrication. Furthermore, studies of modeling, simulation, and experiments are carried out. The experimental and simulation results demonstrate that both the pump's flow and the amplitude of the actuation structure's motion depend on the frequency of the input voltage. The maximal values of the flow and the amplitude will be obtained when the frequency of the input voltage is equal to the actuation structure's first-order natural frequency. The diaphragm air pump has the best performance when it works in resonance mode. With 20-V input, the flow and the amplitude of the air pump are 4.5 ml/s and 0.00041 m, respectively, and the power consumption of the pump can be as low as 3.18 mW. With the advantages of large flow, thin structure, and low power consumption, the diaphragm air pump has great potential applications for air supply for microfuel cells or the cooling of electronic devices.
Liquid crystal displays (LCDs) with edge-lit backlight systems offer several advantages, such as low energy consuming, low weight, and high uniformity of intensity, over traditional cathode-ray tube displays, and make them ideal for many applications including monitors in notebook personal computers, screens for TV, and many portable information terminals, such as mobile phones, personal digital assistants, etc. To satisfy market requirements for mobile and personal display panels, it is more and more necessary to modify the backlight system and make it thinner, lighter, and brighter all at once. In this paper, we have proposed a new integrated LGP based on periodic and aperiodic microprism structures by using polymethyl methacrylate material, which can be designed to control the illumination angle, and to get high uniformity of intensity. So the backlight system will be simplified to use only light sources and one LGP without using other optical sheets, such as reflection sheet, diffusion sheet and prism sheets. By using optimizing program and ray tracing method, the designed LGPs can achieve a uniformity of intensity better than 86%, and get a peak illumination angle from +400 to -200, without requiring other optical sheets. We have designed a backlight system with only one LED light source and one LGP, and other LGP design examples with different sizes (1.8 inches and 14.1 inches) and different light source (LED or CCFL), are performed also.
A preparation method of cold atomic beam with fine optical characteristics is presented and discussed in this paper. The method is described as followings: cold atoms in three-dimension magneto-optical trap (3MOT) are pushed out because of the imbalanceable resonance-radiation pressure and form a cold atomic beam, whose propagation is limited in a magnetic guide. And then the atomic beam is further transversely compressed by use of two-dimension magneto-optical trap (2MOT). Finally, a state preparation laser processes the atomic beam. Consequently, the continuous cold atomic beam with lower longitudinal velocity, higher flux, much less transverse velocity and homogenous state is obtained. The simulation results show that the preparation method is feasible, which can be used in the establishment of the high-property atom interferometer.
Micro gas pump is one of the important micro fluidic components, which can be used for gas analysis in chemical, air supply of micro fuel cell and micro fluid cooling systems. Pumping gases requires a strong compression ratio inside the pump chamber for gas could be compressed. This paper presents a micro diaphragm air pump actuated by PZT bimorphs, which characterizes thin structure, large air flow and low power consumption. The diaphragm air pump is made up of a cavity and an actuating structure. The actuating structure consists of two PZT bimorphs and a diaphragm with check valves, which could produce large volumetric change ratio. Then, a prototype of the pump whose cavity's dimension is 60×16×2mm was fabricated by precise manufacture. The mathematical models were established and simulation had been carried out, in which the parameters, such as flow rate, diaphragm's vibrating amplitude and resonant frequency are calculated and analyzed. Furthermore, experiments on the pump were carried out. The experimental data are basically agreement with the simulation results. With a voltage of 20V, the air pump's flow is 85.3ml/min in resonance and its power consumption is only 3.18mW. Simulations and experiments show that the diaphragm air pump has high efficiency and good performance. It also shows good application prospects in air supply for micro fuel cell and micro electronic devices' cooling.
The tunneling effect is a kind of quantum effect used extensively. The sensor based on tunneling effect has some advantages, such as high sensitivity, rapid response, low power consumption, low driving voltage and so on. In particular, combined with the MEMS technology, tunneling effect has shown a good application foreground in micro sensor fields. According to the quantum mechanics, such as Schordinger's equation, the theory models of tunneling effect are presented in this paper. Also the expressions of the transmission coefficient and tunneling current about the tunneling barriers are obtained. On the basis of these, a kind of MEMS micro magnetometer based on tunneling effect is presented. The mechanics model of the membrane, which is the key component and is subjected to the axial residual stress at both ends, is founded. The membrane's parameters are optimized and simulated. Some key fabrication processes of the micro magnetometer, such as silicon wafer, glass, combined plate process are developed. Further more, the prototype ofthe MEMS micro magnetometer based on tunneling effect is fabricated.