Evidence for self-organized criticality in unscheduled downtime data of equipment

How to reduce downtime and improve availability of the complex equipment is very important. Although the unscheduled downtime（USDT） issues of the equipment are very complex, the self-organized criticality（SOC） is the right theory to study complex systems evolution and opens up a new window to the investigation of disasters, such as the sudden failure of the equipment. Firstly,SOC theory and its validation method are introduced. Then an SOC validation method for USDT of the equipment is proposed based on the above theory. Case study is done on bottleneck equipment in a factory and corresponding data pre-process work is done. The rescaled-range（R/S） analysis method is used to calculate the Hurst exponent of USDT time-series data in order to determine the long-range correlation of USDT data on time scale;at the same time the spatial power-law characteristic of USDT time series data is studied. The result shows that the characteristics of SOC are revealed in USDT data of the equipment according to the criterion of SOC. In addition, based on the characteristics of SOC,the overall framework of the prediction method for major sudden failure of the equipment is proposed based on SOC.     

新试剂CPAH—Ⅰ的合成,纯化及与铍离子显色反应的研究

该文首次报道了新显色剂－氨基－２－（４－氯－２－膦酸基苯偶氮）－１－－羟基－３，６－萘二磺酸（ＣＰＡＨ－Ⅰ）的合成，纯化，结构鉴定及其与铍离子的显色反应。在所拟定的条件下，铍离子与试剂形成稳定的紫红色配合物，且发色迅速，选择性好，是一个频有应用价值的新的测铍试剂。     

低温Al2O3悬浮电解新工艺的研究

A new process of low temperature Al2O3 suspension electrolysis for produc-ing aluminum in low melting point fluo-chloride system was investigated. Current efficiency (η) expres-sion deduced from experiments on 20～80A electrolysis cell showed that main effects on η are the cell current and the surface of aluminum produced．Increasing cell current and diminishing aluminum surface can both make η increase. On an electrolysis cell of about 100A capacity with the fine γγ-Al2O3 (media diam.1.22μm) and the mixture in which F－/C1－molar ratio was 1 at 750℃，aluminum metal was obtained with 86.3% current efficiency and 11.73kWh specific energy consumption.     

环Z4上线性码的广义RT重量

给出了Z4线性码上广义RT重量的概念.确定了Z4线性码的广义RT重量谱的值,获得了Z4线性码关于广义RT重量的基本性质.     

Degradation of 2,4-dichlorophenol catalyzed by the immobilized laccase with the carrier of FeaO4@MSS-NH2

With the Fe304@MSS （magnetic mesoporous silica spheres）-NH2 as the carrier and the glutaraldehyde as crosslinking agent, the immobilized laccase has been pre- pared and characterized by XRD, IR, SEM and BET etc. Under the optimal conditions, the removal efficiency of 2,4-DCP reached 88 % and the removal efficiency still remained 61.5 % after five cycles of operations. In virtue of GC-MS analysis, 2,5-dimethoxyl-l,4-quinone, 2-chlo- rine-l,4-dimethoxyl benzene, 3,3＇-dichlorine-4,4＇-dimeth- oxyl biphenyl, maleic acid phenol ester, and three kinds of maleic acid, alcohol ester, and para-hydroxyl phenol ester compounds have been identified as intermediate and final degradation products of 2,4-DCP, respectively. Besides, the degradation products of 2,4-DCP have been confirmed by performing the 1H-NMR and 13C-NMR experiments, further demonstrating the degradation mechanism of 2,4- DCP by the immobilized laccase.     

第五方物流的GIMIS对讲调度平台

综述了第五方物流及其相关技术发展,研究基于第五方物流的GIMIS中间件,提出基于第五方物流的GIMIS对讲调度运营平台.     

Generalized reliability measures of Kalman filtering for precise point positioning

To deal with the adverse influence of model failures on Kalman filtering (KF) estimation, it is necessary to investigate the generalized reliability theory, including the model failure detection and identification method as well as the separability and reliability theories. Although the generalized reliability theory for the least square has been discussed for many decades, the generalized reliability theory of KF is not widely discussed. Compared with the least square, KF includes not only the measurement model, but also the dynamic model. In KF, the predicted value of the state parameters from the dynamic model is considered as pseudomeasurements and combined with the observed measurements to compose the form of the least square. According to the reliability of the least square, the generalized reliability of KF is derived. Then, the dynamic model failure of precise point positioning is simulated to demonstrate the usage of the generalized reliability theory. The results show that the adverse influence of the dynamic model failure is more severe than that of the measurement model. Moreover, it is recommended that the model failure identification should always be used even if the overall model test passes. It is shown that the derived generalized reliability measures are suitable for the generalized KF estimation.     

无线通信网络发展趋势研究与分析

从技术和应用角度分析了3G网络的关键技术和特点,研究了3G与WLAN融合建网的可能性、必要性、主要技术和网络的结构,讨论了下一代无线网络的发展方向和趋势。     

东北地区发展林蛙养殖业的探讨

本文介绍了东北地区林蛙的生活习性，养殖方式和方法。对保护林蛙资源，提高蛙农业效益，促进本地经济进行了探讨。     

噻唑烷并手性恶唑硼烷催化剂结构和性质的量子化学研究

采用量子化学从头计算方法研究了噻唑烷并手性恶唑烷催化剂及其硼烷加合物的结构和性质，选用Hartree-Fock方法从6-31g基组下进行了全优化计算，并计算了催化剂其加合物的红外振动光谱，催化剂具有扭曲的椅式构型，与硼烷在N原子处配位形成加合物，反应是放热的，加合物的形成，一方面使得催化剂上B原子所带正电荷增加，有利于与酮羰基氧的配位反应进行；另一方面使得BH3中B-H键被削弱，有利于后续反应中H从BH-3到酮羰基碳的转移，从而增强了催化反应的活性。