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本文通过对高电压、大容量电力电容器过电压周期试验的标准要求分析,结合主电路方案分析选择和系统设计,根据试验参数选取适宜的变压器、电抗器、变频电源等设备,利用电力电子技术、高电压试验技术等对电力电容器过电压试验装置进行了设计.该装置具备电感值及试验电压可调,试验时可监测与显示电压和电流,同时具有过电压、过电流保护的功能,并可进行试验数据的储存和管理.通过试验验证,装置可满足标准的试验要求,为电力电容器参数的设计确定及优化提供可靠的试验支持. 相似文献
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Due to the fact that traditional Speech Endpoint Detection methods' performance degrads greatly in a low signal-to-noise ratio and nonstationary noise, a novel robust adatpive threshold endpoint detection method is proposed. First of all, the LSFM parameter is employed as the distinctive feature and the Burg spectrum estimation is applied to figure out the power spectrum, which can enhance the discriminative ability in classifying speech signals and noise, compared with the traditional speech features. Furthermore, an adaptive threshold based on the Bayes estimation criterion is involved in the final judgment, which overcomes the defect of the fixed threshold in adaptability and improves the detection performance to a greater degree. Simulation results show that compared with the traditional feature-based Speech Endpoint Detection methods, the accuracy of the proposed method has a high accuracy rate, which proves that the new method has a better robust performance in a low SNR and nonstationary noise. 相似文献
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利用Linux内核源代码开放的特点,开展TCP/IP协议栈源代码教学,取得了良好的效果。 相似文献
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Shan Zhang Lina Wu Wenqiang Shi Junchang Qin Wei Feng Yu Chen Ruifang Zhang 《Advanced functional materials》2023,33(29):2302360
Photodynamic therapy (PDT) as a non-invasive strategy shows high promise in cancer treatment. However, owing to the hypoxic tumor microenvironment and light irradiation-mediated rapid electron–hole pair recombination, the therapeutic efficacy of PDT is dramatically discounted by limited reactive oxygen species (ROS) generation. Herein, a multifunctional theranostic nanoheterojunction is rationally developed, in which 2D niobium carbide (Nb2C) MXene is in situ grown with barium titanate (BTO) to generate a robust photo-pyroelectric catalyst, termed as BTO@Nb2C nanosheets, for enhanced ROS production, originating from the effective electron–hole pair separation induced by the pyroelectric effect. Under the second near-infrared (NIR-II) laser irradiation, Nb2C MXene core-mediated photonic hyperthermia regulates temperature variation around BTO shells facilitating the electron–hole spatial separation, which reacts with the surrounding O2 and H2O molecules to yield toxic ROS, achieving a synergetic effect by means of combinaterial photothermal therapy with pyrocatalytic therapy. Correspondingly, the engineered BTO@Nb2C composite nanosheets feature benign biocompatibility and high antitumor efficiency with the tumor-inhibition rate of 94.9% in vivo, which can be applied as an imaging-guided real-time non-invasive synergetic dual-mode therapeutic nanomedicine for efficient tumor nanotherapy. 相似文献
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The global skyline, as an important variant of the skyline, has been widely applied in multi-criteria decision making, business planning and data mining. In this paper, we extend our early work and propose the maintenance methods to process the subspace global skyline (SGS) queries in dynamic databases. In the previous work, we proposed the index structure RB-tree, which can effectively manage the data to accelerate the subspace global skyline calculation. Also, the basic single SGS algorithm based on RB-tree (SSRB) and the optimized single SGS algorithm (OSSRB) were proposed to process a single SGS query. In addition, the multiple SGS algorithm (MSRB) was proposed to calculate multiple SGS queries by sharing the scan spaces of different queries. In this paper, we design some data structures and propose the maintenance approaches of SSRB, OSSRB and MSRB to cope with updates that happen to data sets. Thus our extended algorithms can be adopted for dynamic data sets. Finally, the experimental results show that the proposed algorithms OSSRB and MSRB have good performance to process SGS queries and they can be easily maintained with dynamic datasets. 相似文献
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详细介绍了长钢8号高炉如何确定残铁口位置的经过,同时对放残铁的效果作了简要说明,为公司在日后的停炉放残铁工作方面积攒了一定的经验。 相似文献
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