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排序方式: 共有127条查询结果,搜索用时 15 毫秒
1.
Heat Generation in Multilayer Piezoelectric Actuators 总被引:1,自引:0,他引:1
Jiehui Zheng Sadayuki Takahashi Shoko Yoshikawa Kenji Uchino J. W. C. de Vries 《Journal of the American Ceramic Society》1996,79(12):3193-3198
Multilayer piezoelectric actuators when driven under high frequency, generate significant heat, which influences the reliability and other piezoelectric properties. In this paper, heat generation in various types of multilayer PZT-based actuators was studied. Experimental results showed that heat generation is mainly caused by ferroelectric hysteresis loss in the stress-free state. A simplified analytic method was established to evaluate the temperature rise, which is useful for the design of multilayer and other high-power actuators. 相似文献
2.
A GalnAsP edge-detecting photodiode was coupled with an SiO2-TiO2 single-mode waveguide in a simple hybrid integration scheme. The newly developed edge-detecting photodiode with a window region was used to improve photodiode durability. 相似文献
3.
Takaaki Tsurumi Young-Bae Kil Kouhei Nagatoh Hirofumi Kakemoto Satoshi Wada Sadayuki Takahashi 《Journal of the American Ceramic Society》2002,85(8):1993-1996
The material coefficients of "soft" and "hard" lead zirconate titanate (PZT) ceramics were determined as complex values by the nonlinear least-squares-fitting of immittance data measured for length-extensional bar resonators. The piezoelectric d -constant should be a complex value to obtain a best fitting between observed and calculated results. Because the elastic, dielectric, and piezoelectric losses determined in this process were not "intrinsic" losses, a calculation process to evaluate the "intrinsic" losses was proposed. It was confirmed that the intrinsic losses were smaller than the corresponding extrinsic losses. The intrinsic piezoelectric loss existed in both soft and hard PZTs; ∼50% of the loss of piezoelectric d -constant was derived from the elastic and dielectric losses. The most notable difference between the soft and hard PZTs was observed in their elastic losses. 相似文献
4.
We applied a Mo/B4C multilayer coating to a laminar holographic grating with 2400 grooves/mm and a 1-m radius of curvature. By use of synchrotron soft x rays the multilayer-coated grating was evaluated to have diffraction efficiencies of 3.1% and 0.017% for s- and p-polarized radiation, respectively, at a 6.7-nm wavelength at a 45.35 degrees grazing angle of incidence in the +1 (inside) grating order. Thus the polarizance was estimated to be 98.9% at least. The zero-order peak was suppressed by the destructive interference caused by the groove profile. 相似文献
5.
Friend J Nakamura K Ueha S 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2004,51(7):871-878
A torsional microtransducer for high-power applications was developed using standard bulk lead zirconium titantate (PZT) placed upon a small rectangular prism made from phosphor bronze, with a tapered conical end serving as a horn and a machined interior to improve the actuator's response. Torsion was obtained from a prototype at the design frequency of 192 kHz as well as over a wide range of frequencies from 136 kHz to 1.02 MHz. Torsional vibration velocities of 335 mm/s at 192 kHz were measured at 27.3 V(RMS) on the 1.5-mm diameter output tip, amounting to 25,600 degree/s vibration velocity along the outer circumference of the tip. At 1.02 MHz, a torsional vibration velocity of 1750 mm/s (134,000 degree/s) at 17.8 V(RMS) was obtained through use of the thickness mode of the PZT elements. Using the design described in this study, high-power torsional transducers with diameters of 5 mm and below are now possible. 相似文献
6.
A single-element tuning fork piezoelectric linear actuator 总被引:1,自引:0,他引:1
Friend JR Satonobu J Nakamura K Ueha S Stutts DS 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2003,50(2):179-186
This paper describes the design of a piezoelectric tuning-fork, dual-mode motor. The motor uses a single multilayer piezoelectric element in combination with tuning fork and shearing motion to form an actuator using a single drive signal. Finite-element analysis was used in the design of the motor, and the process is described along with the selection of the device's materials and its performance. Swaging was used to mount the multilayer piezoelectric element within the stator. Prototypes of the 25-mm long bidirectional actuator achieved a maximum linear no-load speed of 16.5 cm/s, a maximum linear force of 1.86 N, and maximum efficiency of 18.9%. 相似文献
7.
8.
Michihiro Asakawa Sadayuki Kaneko Reiji Hattori 《Journal of the Society for Information Display》2011,19(10):693-699
Abstract— A shrunk multiline addressing method (SMLA) in a passive‐matrix‐driven liquid powder display will be discussed. An algorithm to generate SMLA data that effectively reduces the number of scanning lines has been devised. The update time is reduced by 44.5% on average, and this reduction is maintained despite increased sizes of the images. The SMLA data generated by this algorithm is applied to e‐paper panels, thereby confirming the reduction in update time and that the image quality of the panels driven by SMLA is equal to that of conventionally driven ones. 相似文献
9.
Recent progress on low-bending-loss single-mode optical fibers for fiber-to-the-home (FTTH) is reviewed. Designing and manufacturing for three types of fibers-a step-index-profile fiber, a trench-index-profile fiber, and a holey fiber-are discussed. The trench-index-profile fibers and the holey fibers are confirmed to be candidates for indoor wiring because of their low bending losses, as well as splice losses. 相似文献
10.
M Sakuramoto T Himeno K Minoguchi N Watanabe H Kobayashi T Koseki N Kihara M Fujiwara 《Canadian Metallurgical Quarterly》1997,46(11):1123-1131
Orthostatic dysregulation (OD) has been reported to be complicated with childhood bronchial asthma. 42 patients (28 females and 14 males) with adult-onset bronchial asthma were selected randomly to investigate the prevalence of OD. OD was diagnosed by both questionnaire for subjective symptoms and tilting test (Schellong test and upright ECG). Our results revealed that 64.3% (both 64.3% in females and males) of the patients were complicated with OD. There was no significant difference in the duration of asthma, FEV0.1, %FEV1.0, serum IgE level, and severity of asthma between patients with OD and without OD. Furthermore, no significant difference in the results of tilting test were observed. In serum level of theophylline we couldn't detect any subjective difference between the two groups, however there was significant difference between positive patients and negative patients in tilting test. In conclusion, OD is frequently complicated with adult-onset asthma and we should be careful of the subjective symptoms concerned with OD. 相似文献