合成反应时间对LGV无铬木质素降粘剂性能的影响

报导了合成反应时间对无铬木质素降粘剂LGV特性粘度、吸附、水化、絮凝及降粘性能影响的研究结果。     

RuO2/La2O3/TiO2复合光催化剂对直接红棕M的降解研究

采用溶胶—凝胶—浸渍法制备RuO2/La2O3/TiO2纳米粉体.以汞灯为光源,直接红棕M溶液的光催化降解为模型反应.结果表明:掺杂质量百分比为1.39%的La2O3,0.12%的RuO2,煅烧温度500℃时,RuO2/La2O3/TiO2的催化活性最高;当通气量为100mL/min,催化剂投加量为3.00g/L,初始pH值为8.98时,该催化剂对直接红棕M的降解率可达100%.     

Flow analysis of heavy metals in MSW incinerators for investigating contamination of hazardous components

The contribution of hazardous components in municipal solid waste (MSW) to environmental risks has seldom been quantified due to their heterogeneous streams and irregular disposal patterns. A material flow analysis, in which the input metals in major MSW compositions (excluding discriminable hazardous components) were subtracted from the total output metals in the treatment products, was proposed to estimate the heavy metal contamination in MSW due to hazardous components. The statistical data from 1-year field measurements for two large-scale incinerators in Shanghai city were used as an illustrative example. The results indicated that the amount of Cr and Ni in the incineration products were similar to those found in the major MSW compositions, while the amounts of Cd, Cu, Pb, and Zn in the incineration products were 2.27-4.00 times, 1.90-3.77 times, 2.25-3.51 times, and 2.98-4.06 times greater than that in the MSW. According to evaluation, more than 56-75% of Cd, 47-74% of Cu, 56-72% of Pb, and 66-75% of Zn in the MSW were contributed by the minor hazardous components, indicating the need for source separation. The methodology provides a cost-effective procedure for quantification of the hazardous waste contamination in MSW.     

Analysis of epoxidized soybean oil by gas chromatography

A fast and cost-effective procedure to quantitate epoxidized soybean oil by means of an external standard method is reported. This procedure is applicable to commercial epoxidized oils, polymer additive packages and polymers—polyvinyl chloride (PVC)—containing epoxidized oils. The epoxidized soybean oil is converted into fatty acid methyl esters with tetramethylammonium hydroxide, and analyzed by capillary gas chromatography with flame-ionization detection. In PVC samples, the epoxidized soybean oil was extracted with toluene and followed by derivatization prior to analysis. The methyl esters of monoepoxyoctadecanoic, diepoxyoctadecanoic and triepoxyoctadecanoic acid were separated with a short capillary column.     

铝镁合金分馏塔冬季焊接施工要点

2009年10月,我公司承揽的内蒙古大唐国际克什克腾煤制气项目48000Nm3/h空分装置两台冷箱铝镁合金分馏塔组焊时,冬季温度-10℃左右,施工环境温差较大,铝镁合金因环境温差大易造成焊缝开裂,影响工程正常施工.我们采用电加热器加热保证塔壁温差,焊接时采用局部加热、加固点固焊、分段倒退焊等一些列焊接措施,克服了铝镁合金焊缝开裂、气孔、变形等缺陷,顺利完成了任务,为我公司冬季铝镁合金焊接施工积累了经验.     

基于生成对抗网络的文本生成图像算法

文本生成图像算法对生成图像的质量和文本匹配度有很高的要求. 为了提高生成图像的清晰度, 在现有算法的基础上改进生成对抗网络模型. 加入动态记忆网络、细节校正模块(DCM)、文本图像仿射组合模块(ACM)来提高生成图片的质量. 其中动态记忆网络可以细化模糊图像并选择重要的文本信息存储, 以提高下一阶段生成图像的质量. DCM纠正细节, 完成合成图像中缺失部分. ACM编码原始图像特征, 重建与文本描述无关的部分. 改进后的模型实现了两个目标, 一是根据给定文本生成高质量的图片, 同时保留与文本无关的内容. 二是使生成图像不再较大程度依赖于初始图像的生成质量. 通过在CUB-200-2011鸟类数据集进行研究实验, 结果表明相较之前的算法模型, FID (Frechet inception)有了显著的改善, 结果由16.09变为10.40. 证明了算法的可行性和先进性.     

利用糖类成分评价我国油菜原蜜的品质

目的以油菜原蜜为研究对象,通过测定其中果糖、葡萄糖、蔗糖和麦芽糖的含量评价我国大宗原蜜的品质。方法采用高效液相色谱示差折光法测定我国10个省份共36种油菜原蜜样品中果糖、葡萄糖、蔗糖和麦芽糖的含量。结果用液相色谱方法测定蜂蜜中的果糖、葡萄糖、蔗糖和麦芽糖,最低检测限分别为0.079 g/100 g、0.018 g/100 g、0.037 g/100 g及0.094 g/100 g,定量检测限分别为0.263 g/100 g、0.061 g/100 g、0.124 g/100 g及0.314 g/100 g。36种油菜原蜜中果糖、葡萄糖、蔗糖和麦芽糖的含量范围分别为26.00~38.16g/100 g、23.65~39.68 g/100 g、0.14~0.62 g/100 g及1.09~3.10 g/100 g。结论油菜原蜜样品中的蔗糖含量都符合我国蜂蜜国家标准,但其中31.8%的样品中葡萄糖和果糖总量低于国家标准。目前,我国大宗蜂蜜不存在人为掺入蔗糖的问题。     

An Enhanced Drawing Reproduction Graphical Password Strategy

Passwords are used in the vast majority of computer and communication systems for authentication. The greater security and memorability of graphical passwords make them a possible alternative to traditional textual passwords. In this paper we propose a new graphical password scheme called YAGP, which is an extension of the Draw-A-Secret (DAS) scheme. The main difference between YAGP and DAS is soft matching. The concepts of the stroke-box, image-box, trend quadrant, and similarity are used to describe the images characteristics for soft matching. The reduction in strict user input rules in soft matching improves the usability and therefore creates a great advantage. The denser grid granularity enables users to design a longer password, enlarging the practical password space and enhancing security. Meanwhile, YAGP adopts a triple-register process to create multi-templates, increasing the accuracy and memorability of characteristics extraction. Experiments illustrate the effectiveness of YAGP.     

Harmonic broadcasting for video-on-demand service

Using conventional broadcasting, if we want to support a 120-minute popular movie every 10 minutes, we need 12 video channels. Assuming the set-top box at the client end can buffer portions of the playing video on a disk, pyramid broadcasting schemes can reduce the bandwidth requirements to 5.7 channels. We present a new scheme which only needs 3.2 channels. For a movie with length D minutes, if we want to reduce the viewer waiting time to D/N minutes, we only need to allocate H(N) video channels to broadcast the movie periodically, where H(N) is the harmonic number of N, H(N)=1+1/2+…+1/N. In order to support video-on-demand service for a popular movie, the new scheme greatly reduces the bandwidth requirements     

基于蚁群的无线传感器网络概率路由算法

针对多数无线传感器网络路由算法易在网络中形成关键节点,而节点的失效往往导致整个网络的失效问题,提出了将随机思想与蚁群算法的特征相结合的一种新的概率路由计算方法.实验表明,该算法对延长整个网络的有效生存时间的效果较好.