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This paper discusses both thermal management of a microrobot and a control IC. The developed microrobot is fabricated by the MEMS (Micro Electro Mechanical Systems) technology. The miniature actuator is constructed by SMA (Shape Memory Alloy) wires and a rotor. It shows rotational motion by heating and cooling process of the SMA wire. Moreover, artificial neural networks are used for the miniature...
Existing intracellular electrodes possess the disadvantages of causing cell death via mechanical stress during the tip insertion through the cell membrane, and integration difficulty because the electrode structure is based on glass capillaries. Recent research on nano-scale metal microelectrodes for intracellular recording reports that the microelectrode tip scarcely penetrates the cell membrane...
In recent years, various types of medical applications of microwave have widely been investigated and reported. In this study, the authors apply thermal effect of the microwave for development of the surgical devices. In this study, a forceps type microwave surgical device is developed. Moreover, the device is equipped a tissue coagulation detection mechanism by employing the impedance change of tissue...
We report the effect of Cl-doping in highly mismatched ZnTeO alloys grown on ZnTe substrate by molecular beam epitaxy using ZnCl2 as a dopant source in order to introduce electrons into the intermediate band of ZnTeO that is required to be half-filled with electrons for the efficient operation of an intermediate band solar cell. The ZnCl2 cell temperature was varied between 70 and 250 °C. In order...
Miniaturized hexapod MEMS microrobots with two kinds of actuators were described in this paper. The actuator of MEMS microrobots had two types which were shape memory alloy (SMA) actuator and piezoelectric (PZT) actuator. For PZT type microrobot, a piezoelectric element was affixed outside the rotor. The piezoelectric element would be expanded by electrical pulses and impacted on the rotor to generate...
This paper suggests the MEMS air turbine that used for the MEMS electromagnetic induction type generator. In the MEMS air turbine that employed the fluid dynamic bearing system, the gap between the magnet and the magnetic circuit and the eccentric motion of the rotor are problem in the high efficiency and the high output power. The developed MEMS air turbine has miniature silicon structure and the...
This paper proposes an electromagnetic induction type MEMS (Micro Electro Mechanical Systems) motor. The developed MEMS motor is combined the MEMS process and the multilayer ceramic technology. The MEMS process forms the silicon miniature components for a structural part. The multilayer ceramic technology fabricates a miniature ceramic magnetic circuit. This technology is possible to realize a miniature...
The piezoelectric properties are measured for the alternative copolymer of vinylidene cyanide and vinyl acetate. It was found that a stretched polarized copolymer exhibited much larger values of electromechanical coupling constants, Kt, than did poly(vinylidene fluoride) films treated by the same poling conditions. Additionally, no piezoelectric decay occurs in the polarized copolymer after long-term...
To avoid some cancer risks associated with the viral gene transfer process, the development of physical or chemical processes has received a great deal of attention in recent years. We found a unique cell membrane perforation method that applies photochemical oxidation to a limited cell membrane area, resulting in a high animal cell survival rate. We recently developed a nano-needle array cell membrane...
We demonstrate 12-core × 3-mode dense SDM transmission over 527 km graded-index multi-core few-mode fiber without mode-dispersion management. Employing low baud rate multi-carrier signal and frequency-domain equalization enables 33.2-ns DMD compensation with low computational complexity.
We report the growth and characterization of the Zn1−xCdxTe1−yOy (ZnCdTeO) layers on ZnTe substrates by molecular beam epitaxy technique for the application of intermediate band solar cells. ZnCdTeO layers with a wide range of Cd and O contents of 0–0.7 and 0.005–0.02, respectively, were grown by changing Cd/(Cd+Zn) flux ratio and O radical supply. The decrease of the transition energy from valence...
Cu2SnSe3 (CTSe) thin films were fabricated by coevaporation on soda-tune glass substrates at the substrate temperature of 300 °C under rations Co Sd supply ratios. From X-ray diffraction ( XRD) analyses, diffraction peaks of CTSe with a cubic sphalerite structure were observed in all CTSe thin films. In addition, SnSe and SnSe2 phases were also detected in Sn-ricb CTSe thin films. On the other bands,...
A composite right-/left-handed stub resonator is presented as a cost-effective approach to designing low phase-noise oscillators. By engineering the dispersion of the CRLH stub line, the novel resonator exhibits unloaded-Q value beyond the limit of microstrip line resonators. A 9-GHz oscillator using the compact resonator achieved a phase-noise of −134 dBc/Hz at 1-MHz offset despite the high dielectric...
Recently, Mn-based Heulser alloys with a chemical formula of Mn2YZ have been attracted attention in the field of spintronics because many of them are reported to be half-metallic ferro- or fer-ri-magnets. Although they indicate comparatively low total magnetic moment, their Curie temperature is enough high for the application. Therefore, the Mn-based Heulser alloys are thought to be potential candidates...
Induction motors are driven using pulse-width modulation (PWM) inverters because of the ease of control and energy saving that may be realized. When the iron loss of an induction motor is calculated using the finite element method (FEM), there are differences between experimental and simulation results obtained under PWM inverter excitation. To improve the accuracy using FEM, it is important to understand...
This paper proposes a pulse-type hardware neuron model (P-HNM) bare chip integrated circuit (IC). And the developed bare chip IC realizes a mountable size on a millimeter scale robot. The P-HNM is mimicking a neural networks of a brain system of the living organisms. The neural networks receive the information as stimulation from the outside at a cell body through an axon, and then, it work to the...
We found a unique cell membrane perforation method which is applying photochemical oxidation on a limited area of the cell membrane, with high survival rate. We recently developed an nano needle array cell membrane perforator which is containing photosensitizer for mass cell processing and a robotic processing system. However, There were problems that the perforating processing efficiency for floating...
The user traffic volume in the cellular network has been growing rapidly. Recent capacity enhancement techniques based on the small-cell architecture are examined for crowded areas such as urban railway stations and environs. Although small-cell propagation environments are characterized by short distances and low antenna heights, the applicability of current MIMO channel models in those environments...
In recent years, MIMO channel models for the crowded areas such as indoor offices, shops, and outdoor hot spot environments have become a topic of great interest. In the crowded environments, the propagation paths are blocked frequently by users walking around the mobile terminal, and it causes severe shadowing and fading of channel. In this paper, to take the impact of pedestrians on the channel...
Recently, the challenges of the utilization of higher frequency bands for cellular systems have been attracting attention. In these high frequency bands, besides the higher propagation losses, the propagation channel tends to suffer more severe shadowing by pedestrians in the environments. In this paper, we carried out measurements in the 26GHz band in an indoor quasi-static environment for figuring...
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