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对输电塔进行损伤定位一直是一个研究难点,通过将输电塔简化为分层的10个子结构,利用加速度时间序列对输电塔结构进行损伤检测,提出了用基于预白化改进的AR前3阶系数指标对损伤进行定位。首先使用加速度数据建立ARMA模型,并提取其AR部分的前3阶系数建立基本指标,然后通过预白化来对该指标进行改进,去除各层数据之间的相关性,使得该指标具备对结构的损伤进行定位的功能,建立了基于时间序列数据的损伤识别方法。首先运用一个经典的3层试验案例验证了该指标的有效性,然后进行了一个6层输电塔损伤检测试验。试验结果表明,所建议的基于时间序列数据的识别方法可以较好地对输电塔进行损伤检测。

在UV（紫外光）通信系统中噪声会对信号产生明显的干扰。为了改善UV系统的的通信质量,采用了一种改进的LDPC（低密度奇偶校验）码算法,并仿真了该算法在UV信道模型中NLOS（非视距传播）的性能。设计了LDPC（960,480）和RS（18,10）编解码器平台。实验结果表明:在给定发送功率和10-6误码率的情况下,相对于未编码的系统,采用RS（里所）编解码仅增加了42%的可靠通信距离,而采用LDPC编解码却能增加约100%的可靠通信距离,能有效改善系统的通信性能。

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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The experiment was to study the extraction of total flavonoids from Ficus carica L. leaves by flash and its antioxidant activity. Ficus carica L. leaves were used as raw materials in the experiment, the method of flash extraction was used, ethanol was used as solvent, and the extraction time, ethanol volume fraction and liquid to material ratio were used as single factors to determine the optimal extraction rate of total flavonoids under corresponding conditions. On the basis of single factor experiment, response surface methodology was used to optimize the extraction process. The result showed that the final extraction of process parameters were extraction time 87 s, ethanol concentration 67%, liquid-solid ratio 87 mL/g. Under these conditions, the actual extraction rate was 3.43%, which were consistent basically with their predicted values (3.41%). The total flavones of Ficus carica L. leaves obtained had good scavenging capacity for DPPH free radicals, superoxide anion free radicals and hydroxyl free radicals, and the IC50 values were 0.019, 0.017 and 0.076 g/L, respectively. The study indicates that the Ficus carica L. has good antioxidant capacity in vitro. [ABSTRACT FROM AUTHOR]

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Using malonyl chloride, fatty alcohol polyoxyethylene ether ( AEO ) and 3-chloro-2-hydroxypropanesulfonic acid sodium as raw materials, an efficient imbibition detergent was synthesized. The results of IR and ¹HNMR structural characterization were consistent with the pre-designed structure. The critical micelle CMC, interfacial tension, morphology, particle size, contact angle, capillary force and imbibition efficiency of the synthesized high-efficiency imbibition detergent were evaluated. The test results showed that the synthesized absorbent CMC=0.0412 g/L, γCMC = 21.23 mN/m;the particle size distribution of 0.3% nano-absorbent was between 10 nm and 80 nm, and the average particle size was 28.21 nm, with uniform microstructure. the interfacial tension with kerosene is 3.5×10 - 4 mN/m, and the interfacial tension with crude oil is 8.3 ×10 - 3mN/m ; the contact angle changed from 121.3° to 57.2°, the capillary rise height was 2.9cm,and the oil washing efficiency increased by 42.05 %. [ABSTRACT FROM AUTHOR]

In view of the packet loss problem of data burst transmission in FPGA multi-application tasks, this study proposes a RFCF algorithm for FPGA traffic management. Based on the rate-based traffic management strategy, the receiver feeds back the remaining resources to the sender by controlling the characters. The sender adopts different data priority transmission strategies according to the resource margin, so as to ensure that the burst data can be processed in time under multi-application tasks. The algorithm is implemented and verified in FPGA board. The results show that the RFCF algorithm can effectively improve the data transmission capability of FPGA in multi-application task scenarios. Compared with the rate-based traffic management algorithm, the packet loss rate of the proposed method is reduced by 14.9%. [ABSTRACT FROM AUTHOR]

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