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1.
PZT铁电薄膜的制备及电学性能研究   总被引:6,自引:1,他引:5  
使用硝酸锆作锆源的溶胶-凝胶方法制备PZT铁电薄膜。他们的电学性能被测试包括电滞回线,电流I(t)特性,漏电流,矫顽场疲劳和老化。测到的PZT薄膜剩余极化8.2μC/cm~2,矫顽场68kV/cm.簿膜的寿命可超过10~(11)周期。  相似文献   
2.
在连续统一模型的基础上建立了描述反向凝固结晶器中的流动与传热的数学模型。利用有限差分方法,计算出了反向凝固结晶器中母带厚度的变化规律,随着母带在钢液中停留时间的增加,母带厚度初期迅速增长,中期平衡相持,后期快速回熔;并进一步研究了反向凝固母带拉速对结晶器中流场的影响情况,拉速较小时,紧贴母带的钢液随母带-同运动,对整个流场的影响不大,当拉速较大或拉速变化较大时,部分甚至整个流场都发生了变化。计算结果表明采用数值模拟求解结果与试验数据是吻合的,证明假设合理,模型正确。  相似文献   
3.
基于JMS的安全通信模型研究与设计   总被引:2,自引:0,他引:2  
面向消息中间件(MOM)的安全性是目前的一个研究热点,目的是设计确保数据传输完整性的安全机制.通过分析JMS的两种消息通信模型,针对它在安全性方面存在的不足,引入了数字签名和加密技术,提出了一个基于身份验证和混合加密的可扩展安全通信模型,并详细介绍了模型的各个组成部分.模型的基本思想是使用数字签名的信息进行双向身份认证,并且在消息传输的过程中,利用双方协商的会话密钥和非对称加密技术对消息进行加密.最后构建了原型系统对模型进行了验证,实验结果表明此模型提高了基于JMS的系统的安全性.  相似文献   
4.
Wu  Xing  Ji  Sihui  Wang  Jianjia  Guo  Yike 《Applied Intelligence》2022,52(13):14839-14852

Human beings are capable of imagining a person’s voice according to his or her appearance because different people have different voice characteristics. Although researchers have made great progress in single-view speech synthesis, there are few studies on multi-view speech synthesis, especially the speech synthesis using face images. On the basis of implicit relationship between the speaker’s face image and his or her voice, we propose a multi-view speech synthesis method called SSFE (Speech Synthesis with Face Embeddings). The proposed SSFE consists of three parts: a voice encoder, a face encoder and an improved multi-speaker text-to-speech (TTS) engine. On the one hand, the proposed voice encoder generates the voice embeddings from the speaker’s speech and the proposed face encoder extracts the voice features from the speaker’s face as f-voice embeddings. On the other hand, the multi-speaker TTS engine would synthesize the speech with voice embeddings and f-voice embeddings. We have conducted extensive experiments to evaluate the proposed SSFE on the synthesized speech quality and face-voice matching degree, in which the Mean Opinion Score of the SSFE is more than 3.7 and the matching degree is about 1.7. The experimental results prove that the proposed SSFE method outperforms state-of-the-art methods on the synthesized speech in terms of speech quality and face-voice matching degree.

  相似文献   
5.
Wu  Xing  Zhang  Yafei  Li  Qing  Qi  Yangyang  Wang  Jianjia  Guo  Yike 《Applied Intelligence》2022,52(13):14665-14678
Applied Intelligence - Face aging is of great significance in cross-time identity verification problem. However, there is still a huge gap between the synthesized face image and the real face in...  相似文献   
6.
Flush toilets waste a significant amount of water every day due to the unavoidable adhesions between human waste and the toilet surfaces. Super-slippery surfaces can repel complex fluids and various viscoelastic solids, however, are easily broken by mechanical abrasions. Herein, the fabrication of an abrasion-resistant super-slippery flush toilet (ARSFT) is reported using a selective laser sintering 3D printing technology. Unlike traditional super-slippery surfaces with limited thicknesses which can be easily worn away, the powder-sintered strategy endows the ARSFT not only with a self-supporting 3D complex shape but also with a porous structure that can accommodate considerable lubricants for an abrasion-resistant super-slippery property. As a result, the as-prepared ARSFT remains clean after contacting with various liquids such as milk, yogurt, highly sticky honey, and starch gel mixed congee, demonstrating excellent repellence to complex fluids. Besides liquids, the ARSFT exhibits a high resistance to sticky synthetic feces. Notably, even after being abraded to 1,000 cycles of abrasion using sandpaper, the ARSFT maintains its record-breaking super-slippery capability. The concept of the 3D-printed object with a superior abrasion-resistant slippery ability will improve the development of super-slippery materials and further save water consumption in the human society.  相似文献   
7.
Abstract— In this paper, several methods to characterize motion blur on liquid‐crystal displays are reviewed. Based on the assumptions of smooth‐pursuit eye tracking and one‐frame temporal luminance integration, a simple algorithm has been proposed to calculate the normalized blurred edge width (N‐BEW) and motion‐picture response time (MPRT) with a one‐frame‐time moving‐window function to LC temporal step response curves. A custom measurement system with a fast‐eye‐sensitivity‐compensated photodiode has been developed to characterize motion blur based on LC response curves (LCRCs). MPRT values obtained by using the algorithm mentioned above and those from the smooth‐pursuit‐camera methods agree. Perception experiments were conducted to validate the correspondence between the simulated results and actual perceived images by the human eyes. In addition, the insufficiency of MPRT to evaluate motion blur on impulse‐type light‐generation LCDs, by analyzing the measurement results of a scanning backlight LCD, is discussed.  相似文献   
8.
锂离子蓄电池正极材料LiFePO4的研究进展   总被引:12,自引:2,他引:12  
陈亦可 《电源技术》2003,27(5):487-490
锂离子蓄电池正极材料的研究正在向高比能量、长寿命、低成本、环境友好的方向发展。橄榄石型LiFePO4近年来引起注意。由于它具有170mAh/g的理论比容量和约3.5V的电压、较好的常温和高温稳定性、低廉的成本和优良的环保性能,有望作为大型移动式锂离子蓄电池的正极材料。对该材料的特性及研究情况进行了较为全面的总结,重点介绍了其结构特点与性能的关系,以及国外为改进其综合性能而进行的有关研究:(1)LiFePO4制备方法(包括高温固相合成法和低温液相合成法);(2)导电性物质的修饰以提高其在大电流密度下的比容量;(3)常温和高温贮存稳定性的实验;(4)LiFePO4的离子导电性和电子导电性。  相似文献   
9.
周亦可 《湖南电力》2003,23(3):52-53
对双水内冷发电机振动进行了分析,发现转子水回路局部堵塞是导致转子热变形引起机组振动的原因;采用正反冲洗并对每个支路进行流量测试比较,找出了流量偏小的线围,并采取了处理措施,保证了机组的正常运行。  相似文献   
10.
雾化器是垃圾发电厂尾气净绍雾化器雾化原理的基础上,指出液滴大小是衡量雾化效果的重要指标,是影响去除硫化物效率的关键因素,同时分析影响液滴大小的主要因素,为雾化器的最经济运行提供指导.  相似文献   
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