LPV重复过程的H_∞滤波新方法

将时滞线性参数变化(LPV)思想应用于重复过程中,研究了其H∞滤波问题。基于参数依赖Lyapunov函数方法推出了该重复过程的稳定性和滤波器设计的充分条件。通过投影定理引入两个附加矩阵,解除了重复过程矩阵和依赖于参数的Lyapunov函数矩阵之间的耦合,使得到的条件便于求解。仿真实例证实了该设计方法的有效性。     

Impact of personality and intelligence on job satisfaction of assembly line and bench work - an industrial study

A study of the impact of machine-paced (M/P) and self-paced (S/P) work on job satisfaction of 28 female industrial assembly workers was evaluated in which M/P work was confounded with simplified work and the S/P job was confounded with enriched tasks. Results indicated the following:

1. 1. Over three-quarters of workers were more satisfied in S/P jobs, while only less than one-quarter were more satisfied in M/P jobs.

2. 2. The 16PF personality test effectively predicts (0·88 multiple correlation) the satisfaction ratios of M/P to S/P jobs.

HPO己内酰胺工艺的现状与前景分析

分析了世界己内酰胺生产和消费现状，指出了HPO工艺在己内酰胺工业中的重要地位，并与己内酰胺生产新工艺进行了比较，提出了今后发展方向，对前景进行了展望。     

正丁烷氧化制顺酐流化床催化剂的喷雾成型

对正丁烷氧化制顺酐流化床催化剂的颗粒成型进行了研究,在不同类型的粘合剂和喷雾成型的条件下,实验获得了不同颗粒尺寸和粒度分布的流化床催化剂。利用正交实验设计方法探讨了喷雾操作条件对催化反应活性的影响及其变化规律,同时确定了最佳喷零操作条件。研究发现,催化剂颗粒尺寸在20～200μm,平均粒径在70～80μm左右的催化剂对正丁烷流化床催化反应的效果最好。     

Effect of lipids on soy protein isolate solubility

Reduced-lipid soy protein isolate (SPI), prepared from soy flour treated so that most of the polar lipids have been removed, exhibited an increase in protein solubility of 50% over that of the control SPI prepared from hexane-defatted flour. Adding lipids from a commercial SPI during processing of reduced-lipid SPI decreased SPI solubility by 46%. The 19% decreased solubility caused by the lipids (primarily phospholipids) was largely recovered by treating the protein with a reducing agent (2-mercaptoethanol). The balance of protein insolubility, caused by the lipids, was attributed to a smaller lipid fraction (approximately 5% of the total lipids). Adding lipids during SPI processing contributed to both the formation of oxidized protein sulfhydryls, incapable of being reduced by 2-mercaptoethanol, and to oxidative deterioration of protein as determined by protein carbonyl contents.     

Destruction of trichloroethylene (TCE) and trichloromethane (TCM) in the presence of selected VOCs over Pt-Pd-based catalyst

Catalytic oxidation of trichloroethylene (TCE) and trichloromethane (TCM) oxidized alone and in two-component mixtures with selected volatile organic compounds (VOCs) such as toluene, n-hexane, ethanol or acetone was investigated over a Pt-Pd-based catalyst on a monolithic, metallic, γ-Al₂O₃-washcoated support. TCE and TCM were more difficult to oxidize than VOCs and temperatures of their 50% conversion (T_50%) amouted to 420 and 330 °C, respectively. All the VOCs added were found to enhance the conversion of the two chlorinated compounds, drecreasing T_50% by 20 °C, at the most, for TCM in the presence of toluene and by 50 °C for TCE in the presence of acetone. Both the chlorinated compounds lowered the conversion of the VOCs added (except that of toluene), and this lowering was particularly distinct with n-heptane; they also raised the concentration of acetaldehyde formed during the oxidation of oxyderivative compounds.     

相转移催化氧化合成氯代苯甲酸

研究了以季铵盐A 1为催化剂,KMnO4作氧化剂,催化氧化邻、对位氯代甲苯合成邻、对位氯代苯甲酸,考察了不同的相转移催化剂的催化活性、催化剂的用量、反应温度、反应时间、KMnO4用量、水的用量等对反应的影响。优化反应条件:反应物料比为,氯代甲苯∶KMnO4为∶A 1∶H2O≈1∶2.6∶0.05∶300(mol),反应温度为93℃,反应时间为2.5h,在中性条件下进行反应,邻、对位氯代苯甲酸的收率分别可达76.4%、76.9%。实验结果表明,季铵盐A 1对此反应是一种优良的相转移催化剂。     

甲基橙指示还原终点铈量法测定铁矿石中全铁含量

铁矿石经HCl-KF HCO4溶样后，用二氯化锡还原Fe^3 为Fe^2 ，以甲基橙做指示剂指示还原终点，肺铈量法测定铁矿石中全铁的含量。方法简便，快速，终点每锐，精密度好，准确度高。     

Catalytic properties of SrSn1−xSbxO3 in methanol oxidation

Ceramic model catalyst materials of general formula SrSn_1–x Sb _x O₃ are synthesised by solid state reaction. X-ray diffraction shows the materials to be single phase over the composition range 0 x0.085, with a second phase, identified as SrSb₂O₅, being produced at higher antimony doping levels. XPS, Auger electron spectroscopy and valence band photoemission show strong segregation of Sb to the surface of the material even within the single phase regime. The catalytic properties of the materials are examined using methanol oxidation as a test reaction. The activity and selectivity to formaldehyde production shown by these materials is found to be strongly correlated with the attainment of the bulk solubility limit of Sb in the SrSnO₃ perovskite host.     

The electroactive species in the catalysis of cyclohexadiene to benzene by Rh2(TM4) 4 +2 (TM4=2,5-diisocyano-2,5-dimethylhexane)

Upon further investigation of the recently reported electrocatalytic oxidation of 1,4-cyclohexadiene to benzene by Rh₂(TM4) ₄ ⁺² (TM4=2,5-diisocyano-2,5-dimethylhexane), we have obtained data which strongly implicates the 2e^– oxidized d⁷-d⁷ complex as the electroactive species. This contrasts with the original report which suggested that the le^– oxidized d⁷-d⁸ radical acted as the key species via hydrogen atom abstraction from 1,4-cyclohexadiene. A possible mechanism for the catalysis is proposed.