Rapid screening of DON contamination in whole wheat meals by Vis/NIR spectroscopy and computer vision coupling technology

This work intends to develop an online experimental system for screening of deoxynivalenol (DON) contamination in whole wheat meals by visible/near-infrared (Vis/NIR) spectroscopy and computer vision coupling technology. Spectral and image information of samples with various DON levels was collected at speed of 0.15 m s⁻¹ on a conveyor belt. The two-type data were then integrated and subjected to chemometric analysis. Discriminant analysis showed that samples could be classified by setting 1000 μg kg⁻¹ as the cut-off value. The best correct classified rate obtained in prediction was 93.55% based on fusion of spectral and image features, with reduced prediction uncertainty as compared to single feature. However, quantification of DON by quantitative analysis was not successful due to poor model performance. These results indicate that, although not accurate enough to provide conclusive result, this coupling technology could be adopted for rapid screening of DON contamination in cereals and feeds during processing.     

乙烯基硅氧烷改性苯丙乳液的研究

在苯乙烯 -丙烯酸酯乳液共聚反应后期 ,加入少量乙烯基硅氧烷 ,制得改性苯丙乳液 ,通过红外光谱初步确定了聚合物结构。研究了反应温度、反应时间、有机硅加入方式、乳化剂用量等因素对反应进程、乳液稳定性及涂膜性能的影响。     

双塔脱丙烷工艺技术

对扬子乙烯装置双塔脱丙烷系统低压塔液泛、高压塔再沸器堵塞等问题进行了技术分析,提出了工艺流程修改方案,完善了双塔脱丙烷技术,对同类装置有参考价值。     

二氧化碳增油技术在孤岛油田的应用

介绍了二氧化碳增油机理和二氧化碳增油技术在孤岛油田的应用情况。现场应用表明 ,二氧化碳非混相驱油是封闭小断块油田的有效增产措施 ,二氧化碳酸化 (压裂 )助排能起到缩短排液时间 ,保护油气层的作用     

Revising deductive knowledge and stereotypical knowledge in a student model

A user/student model must be revised when new information about the user/student is obtained. But a sophisticated user/student model is a complex structure that contains different types of knowledge. Different techniques may be needed for revising different types of knowledge. This paper presents a student model maintenance system (SMMS) which deals with revision of two important types of knowledge in student models: deductive knowledge and stereotypical knowledge. In the SMMS, deductive knowledge is represented by justified beliefs. Its revision is accomplished by a combination of techniques involving reason maintenance and formal diagnosis. Stereotypical knowledge is represented in the Default Package Network (DPN). The DPN is a knowledge partitioning hierarchy in which each node contains concepts in a sub-domain. Revision of stereotypical knowledge is realized by propagating new information through the DPN to change default packages (stereotypes) of the nodes in the DPN. A revision of deductive knowledge may trigger a revision of stereotypical knowledge, which results in a desirable student model in which the two types of knowledge exist harmoniously.     

溶胶-凝胶法制备Li（MoO4）2：Eu及表征

用溶胶-凝胶法制备了平均粒径为2～3μm的小颗粒、高亮度的Li（2-x）（MoO4）2：Eu系列钼酸盐红色荧光体。用XRD、SEM、粒度分析和分子荧光光度计对荧光体进行了表征和研究。常规的固相反应合成Li（2-x）（MoO4）2：Eux系列红色荧光粉需要在900℃以上的高温才能够形成均一的固溶体，而采用溶胶-凝胶法制取，在700℃就可以形成均一的单相Li（2-x）（MoO4）2：Eux，在750℃就可得到发光亮度最高的荧光体。其亮度是常规固相反应于900℃制得的荧光体的124％。采用溶胶-凝胶法制取Li（2-x）（MoO4）2：Eux系列，可以在相当宽的实验条件范围内得到小粒径、窄分布和高亮度的荧光体，具有良好的颗粒形貌。     

A digital secure image communication scheme based on the chaotic Chebyshev map

In this paper, a simple image secure communication scheme based on the chaotic Chebyshev map and chaos synchronization is proposed. The scheme relies on the excellent correlation property of chaotic sequences, which is very desirable for secure image communication. The results obtained by computer simulation indicate that the transmitted source image can be correctly and reliably recovered using the proposed scheme, even through a noisy channel. Notably, the scheme possesses relatively high security and can be easily implemented. Moreover, the quality of the recovered image is satisfactory, quantified by such common criteria as the bit‐error rate performance. Copyright © 2004 John Wiley & Sons, Ltd.     

含氮化合物废气选择性催化氧化技术研究进展

通过对当前含氮化合物废气治理技术的对比分析,总结选择性催化氧化的相关技术优势。根据对含氮化合物的种类及来源分析,介绍氨气、腈类、胺类及其他含氮化合物的催化净化技术。重点总结催化剂的种类、研发进展和在实际使用中可能遇到的问题,同时展望含氮化合物废气选择性催化氧化技术的研发方向。     

NdCl_3·nTBP/MgCl_2-AlR_3催化体系合成丁二烯橡胶

探讨了以NdCl_3的磷酸三丁酯(TBP)溶液为主催化剂、烷基铝为助催化剂、MgCl_2为载体组成的Ziegler-Natta型催化体系引发丁二烯(Bd)聚合的某些规律。用AlEt_3作助催化剂,聚合物的顺1,4-结构含量仅为57％,反1,4-结构含量为42％;而以Al(i-Bu)_3作助催化剂,聚合物的顺1,4-结构含量为88％,反1,4-结构含量为11％。各种陈化体系中,以NdCl_3·nTBP/MgCl_2-Al(i-Bu)_3-Ip三元体系的催化活性最高,当Nd/Bd(摩尔比)为7×10~(-5)时,单体转化率达80％。低温聚合可获得高顺式、高分子量聚合物。     

La-OMS-2催化剂催化甲苯氧化制苯甲醛

合成了氧化锰八面体(OMS-2)分子筛,采用离子交换法和浸渍法制备了稀土金属La改性的OMS-2分子筛(La-OMS-2)催化剂,并用于甲苯液相选择性氧化制苯甲醛,考察了催化剂用量、反应温度、反应时间、氧气流量及溶剂种类对甲苯转化率和苯甲醛选择性的影响,对La-OMS-2催化剂进行了X射线衍射表征和BET比表面积测定。实验结果表明,离子交换法制备的La-OMS-2-A催化剂的活性高于浸渍法制备的La-OMS-2-B催化剂,在甲苯0.1mol、溶剂冰乙酸10mL、氧气流量60mL/min、La-OMS-2-A催化剂用量0.10g、反应温度353K、反应时间1.0h的条件下,甲苯转化率达61%,苯甲醛收率为56%。加入La对OMS-2分子筛中的MnO晶格结构产生了影响,提高了苯甲醛的收率。