We present a mean-field theory to describe volume phase transitions of side-chain liquid crystalline (LC) gels, accompanied by isotropic-nematic-smectic-A phase transitions. Three different uniaxial nematic phases (N1...
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We present a mean-field theory to describe volume phase transitions of side-chain liquid crystalline (LC) gels, accompanied by isotropic-nematic-smectic-A phase transitions. Three different uniaxial nematic phases (N1, N2, and N3) and smectic-A phases (S1, S2, and S3) are defined by using orientational order parameter Sm of side-chain liquid crystals (mesogens), Sb of semiflexible backbone chains, and a translational order parameter σ for a smectic-A phase. We derive the free energy for smectic-A phases of side-chain LC gels dissolved in an isotropic solvent and examine the swelling curve of the LC gel, the orientational order parameters, and the deformation of the LC gel as a function of temperature. We find that the LC gel discontinuously changes the volume at an isotropic-nematic, an isotropic-smectic-A, and a nematic-smectic-A phase transition.
We are attempting to develop an autonomous personal robot that has the ability to perform practical tasks in a human living environment by using information derived from sensors and a knowledge database. When a robot ...
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In our research, we developed a technology for our robot that uses an indoor navigation system based on visual methods to provide the required autonomy. For robots to run autonomously, it is extremely important that t...
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This research aims to develop a combined sense system that uses both the sense of a force feedback as well as visual feedback in the shape of microscopic features from a micro sample. It is thought that the efficiency...
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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency cont...
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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency control by controlling the vector angle of stator current. As for the high efficiency control, we define the optimum angle as the stator current angle which makes the torque biggest against certain stator current value. The optimum angle is shown as the equation about the stator current value. In addition, we propose the methods to find real optimum angle for the real system by changing stator current angle around calculated optimum angle in the low frequency. Furthermore, we show the possibility of more efficiency method to find real optimum angle by using the disturbance observer. Proposed method is realized by uniting between motor drive control region and mechatronics control region. The proposed method is validated by simulation.
This paper presents a method for estimating the torque and speed of line-start induction motor (IM). IM is being used for various purposes because that is a high trust machine for the load mechanism and can be used ea...
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This paper presents a method for estimating the torque and speed of line-start induction motor (IM). IM is being used for various purposes because that is a high trust machine for the load mechanism and can be used easily. So, IM is non-breakable. However, load mechanism sometime break. We try to check the condition of load mechanism by estimate the torque and speed of IM. We take up the motor-operated valve for load mechanism. Motor-operated valve is driven by line-start IM. Movement environment of IM is characterized by high temperature and humidity and therefore, it is difficult to position sensors near motor. In such a case, we must troubleshoot the system without using torque or speed sensors. The proposal method can estimate the torque and speed of IM by using the current and voltage near the switchboard. We use the inner and outer products between currents and voltages. Furthermore, we propose the parameter identification method of mutual inductance, leaked inductance and rotor resistance. The proposed method is validated by experimental results.
For investigation of the flux pinning properties of nanoparticles in TFA-MOD processed Y1−xGdxBa2Cu3Oy (YGdBCO) coated conductors, the critical current density was compared in various directions of the magnetic field ...
For investigation of the flux pinning properties of nanoparticles in TFA-MOD processed Y1−xGdxBa2Cu3Oy (YGdBCO) coated conductors, the critical current density was compared in various directions of the magnetic field for YGdBCO+BaZrO3 (BZO) and YGdBCO coated conductors with the superconducting layer of 0.5 μm thickness. It was found that Jc for θ = 0° (B//e) is larger but Jc for θ = 90° (B//ab) is smaller in YGdBCO+BZO than in YGdBCO. The increase in the normal field is attributed to the pinning of nanoparticles, while the decrease in the parallel field is considered to be caused by limitation of extension of stacking faults by distributed BZO nanoparticles. In addition, the n-value (E ∝ jn) decreases by introduction of BZO nanoparticles for θ = 90°, while it is unchanged for θ = 0°. These results are well described by a theoretical model of flux creep and flow.
In traditional reliability theory, both the system and its components are allowed to take only two possible states: working or failed. On the other hand, in a multi-state system, both the system and the components are...
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We report noise-controlled electrohydrodynamic pattern formations and threshold shifts in nematic liquid crystals. In the electrohydrodynamic system superposed with noise, experimental results obtained in the dielectr...
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We report noise-controlled electrohydrodynamic pattern formations and threshold shifts in nematic liquid crystals. In the electrohydrodynamic system superposed with noise, experimental results obtained in the dielectric regime are compared to those in the conventional conduction regime. The noise intensity dependences of thresholds and pattern evolution processes are remarkably different for each regime. The pattern formation mechanisms in the presence of noise for both regimes are discussed based on the results. Moreover, it is found that the thresholds and characteristic wavelengths of dissipative structures can be effectively controlled by external multiplicative noises with appropriate intensity and correlation times.
We describe a unique competition based on the novel concept of robotics and mechatronics products that included evaluation of the products' engineering function and interface design. Seventy-seven students of elev...
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