Identification of <Emphasis Type="Italic">Fallopia</Emphasis> species based on the chloroplast <Emphasis Type="Italic">mat</Emphasis>K gene sequences

In order to develop an efficient identification method for Fallopia plants and drugs, molecular analysis of the partial matK gene sequences was performed on 6 Fallopia species. Based on the matK sequences, a phylogenetic tree was constructed, which showed that different populations of inter- and intra-species could be specified and distinguished. The matK gene sequences of the 6 Fallopia species were all found to be of 1 271 bp in length, with some nucleotide variations throughout the entire sequences. The nucleotide difference at position 1 041 could distinguish F. denticulata from others, while specific nucleotide at position 1 154 became identification markers for F. aubertii. Moreover, four specific marker sites for F. multiflora var. ciliinerve at positions 216, 224, 1 060 and 1 179, seven for F. convolvulus at 318, 765, 772, 874, 936, 952 and 1 036, and seven for F. dentate alata at 111, 192, 366, 450, 457, 1 032 and 1 074 were also observed. By detecting the marker nucleotides and analyzing the phylogenetic relationship, the botanical origins of five inspected drugs were determined, suggesting that matK sequences can be used for authenticating Fallopia plants and drugs.     

A blind watermarking algorithm resisting to geometric transforms based on SVD

A new watermarking algorithm resisting to geometric transformation based on singular value decomposition(SVD) in logarithm polar coordinate is proposed.The log-polar mapping(LPM) is used to resist rotation and scaling attacks,and the odd-even quantization algorithm is used to embed watermark so it can be extracted without the original host image.The experiments show that the proposed algorithm not only resists various geometric attacks but also is robust enough to the common signal processing.     

回热型三元溶液吸收式制冷系统实验研究

基于无回热型氨-水-溴化锂三元溶液无泵吸收式制冷系统较传统系统的热力性能好、初投资费用少和安全性高,提出了3种回热型系统的改进方案,并做了系统比较和实验分析.方案Ⅰ,在wNH3=50%,wLiBr=15%时,系统性能系数(COP)提高约27.8%;方案Ⅱ,在同等条件下,COP提高约65%.可见,增加回热流程后,COP得到了显著提高.对改进型方案Ⅱ存在的问题做了讨论,提出了新的改进方案Ⅲ.     

Phase field simulation of the 180° domain-switching process in PbTiO<Subscript>3</Subscript> single crystal under an antiparallel electric field

The process of 180° domain switching in PbTiO₃ single crystal under an antiparallel electric field was investigated by the three-dimensional phase field simulation, especially the effect of electric field on the type and duration of domain switching. It is found that the polarization reversal of domains takes place under an antiparallel electric field in PbTiO₃ single crystal. The results of the phase field simulation indicate that there is only 90° domain switching under a weak electric field. With the rise of the electric field, 180° domain switching appears. If the electric field is strengthened further, 90° domain switching disappears and the duration of domain switching is shortened.     

A novel data embedding method for H.264 stereo video codec with joint prediction scheme

It is important to reduce data redundancy of stereo video in practical applications. In this paper,first,a data embedding method for stereo video(DEMSV) is investigated by embedding the encoding data into the reference frame to encode stereo video. It can use only one channel to transfer all the video data and the receiver can choose a monocular video decoder or stereo video decoder adaptively. Then,introducing the joint prediction scheme in the coding process of DEMSV,we propose a novel data embedding meth...     

以桑蚕幼虫作为饲料蛋白替代品的初步研究

采用田间试验和仪器分析方法,研究了植物营养剂处理桑叶对蚕体重的影响,结果表明：用植物营养剂处理的桑叶饲喂桑蚕幼虫的处理,桑蚕幼虫体重比常规对照增产6.8%,蛋白质含量达到69.8%;含有8种必需氨基酸,且氨基酸均衡性较好,为饲料蛋白找到新的替代品.     

应力吸收层沥青结合料特性研究

为了分析沥青结合料对应力吸收层性能的影响,保证应力吸收层发挥良好的功能,文章以SK90#基质沥青、SBS改性沥青和橡胶沥青为研究对象,对其进行常规试验和SHRP试验,分析了3种沥青的高低温性能、弹性恢复性能和抗疲劳性能。研究表明,胶粉掺量为19%,高速搅拌时间为1h的橡胶沥青具有较强的高低温性能和抗老化性能,能很好满足应力吸收层的功能要求,是作为应力吸收层结合料的较佳选择。     

Controllable stereoselective synthesis of pyrano[3,2-<Emphasis Type="Italic">c</Emphasis>]quinolines by lanthanide halides catalyzed aza-Diels-Alder reactions

An efficient method for the synthesis of tetrahydroquinoline derivatives via lanthanide halides catalyzed domino reactions of arylamines with dihydropyran is described. Either the cis or the trans isomer can be obtained as the major product in good yield by changing the catalyst and reaction conditions.