一类时滞Hopfield神经网络系统的全局稳定性

研究一类时滞Hopfield神经网络系统的平衡状态的存在性与全局稳定性,这类系统放弃了以前对激活函数的可微性与单调性要求。利用M矩阵理论,通过构造适当的Liapunov泛函,得到了系统全局渐近稳定的充分条件,改进了以前的相关结论。     

车辆段内联网设计方案

说明了企业内联网的特点,叙述了包头西车辆段内联网的设计背景、设计原则以及所采用的主要技术,最后详细说明了该网络的主要功能.     

主机遥控系统转速控制故障探析

对某船主机遥控系统转速控制故障的机理进行了简述,并对故障形成的原因进行了分析和探讨,还从管理的角度提出了一些建议。     

Surface chlorophyll in the Black Sea over 1978–1986 derived from satellite and in situ data

Absolute values of chlorophyll a concentration and its spatial and seasonal variations in the Black Sea were assessed by using satellite CZCS and in situ data. Since the satellite CZCS had operated for the 1978–1986 period, CZCS data was used for assessing the past state of the Black Sea just before the onset of drastic changes observed in late 1980s. The approach used for the calculation of the absolute values of chlorophyll a concentration from CZCS data was based on the direct comparison of in situ chlorophyll a data and those of CZCS and by applying the algorithm developed for the transformation of CZCS data into chlorophyll a values. CZCS Level 2 data related with pigment concentration having a spatial resolution of 1 km at nadir were used. The daily Level 3 files were derived by binning Level 2 values into 4-km grid cells and the monthly and seasonal Level 3 files were created by averaging the daily Level 3 files over the corresponding period. In situ chlorophyll a data were obtained by spectrophotometric and fluorometric methods in 15 scientific cruises over the 1978–1986 period. Total number of ship-measured data used for the comparison with those CZCS values was 590.Chlorophyll a concentration (Chl) was derived from CZCS values (C) with regression equations Chl=kC; the coefficient of transformation k was calculated from six different data sets by taking into account distinctions between subregions and seasons. The reasons for difference in the k values have been analyzed.Statistical comparison of the chlorophyll a values measured in situ and those derived from CZCS data was based on log-transformed data and gave the following results: regression SLOPE=0.842, regression INTERCEPT=−0.081, coefficient of determination (R²)=0.806, root–mean–square ERROR=0.195. The mean monthly chlorophyll a distributions derived from CZCS data over 1978–1986 have been constructed and the mean seasonal chlorophyll a values in different regions have been calculated and analyzed. The significant difference in chlorophyll concentration between the western shelf regions and the open part of the Black Sea has been demonstrated, especially in warm season. At almost all seasons, the highest chlorophyll concentration is observed in the western interior shelf region which is under strong influence of Danube. The summer mean chlorophyll concentration in this region is 18 times higher than that in the open parts and about nine times higher than in the eastern shelf region. The greatest seasonal variations are observed in the open part of the Black Sea: chlorophyll concentration in cold season is four to six times higher than in summer and three to five times higher than in April and October. To the contrary, in the western interior shelf regions, the concentration is higher in May–October (about twice than that in November–March). Seasonal variations in the western outer shelf regions are smoothed out as compared with both the western interior shelf and the open regions.     

船用柴油主发电机弹性底座安装工艺改进

本文主要阐述了船用柴油主发电机弹性支撑底座安装的特点,从而针对一般施工工艺中的问题进行总结并改进与完善,达到提高作业效率,缩短生产周期的目的。     

The local development effects of major new roads

This paper is based on research undertaken for CPRE (Council for the Protection of Rural England) arising from concern at the inadequacy of current road planning procedures to address the issue of local development effects. The paper puts forward a number of arguments of principle in support of this proposition before recounting the planning and development experience of sites in the vicinity of the original (London-Oxford) section of M40 motorway built 20–30 years ago. This experience points to quite different outcomes in areas of open countryside as distinct from the periphery of the major intermediate town (High Wycombe), paricularly enclaves of enclosed land near to motorway junctions. With the latter the experience points to the failure of the planning system to anticipate and cope satisfactorily with development pressures. Since the provisions of development plans are used as the basis for assessing the impact of new road proposals this situation is not merely inefficient but conflicts with the basic purpose of the public planning system to give full consideration to the likely effects of proposals before they are committed.     

海事劳工公约(2006)与海事管理

海事劳工公约（2006）的通过对世界航运业将产生深远的影响。文章通过对该公约的特点及结构、内容等方面较系统的介绍．指出海事管理机构应积极行动来迎接即将生效的新公约。     

间接法和捕捉法检测特异性IgM的敏感性与特异性的比较

目的比较捕捉法和间接法检测IgM时的特异性和敏感度差异,并探讨其产生差异的原因。方法分别用间接ELISA法和捕捉ELISA法检测活动性乙型肝炎和肾综合征出血热(HFRS)患者标本的IgM水平,并比较两者之间检出率、检测阈值、特异性的差异。结果检测稀释在PBS中的鼠抗IgM特异性抗体,两种方法的特异性和敏感度类似;检测活动性乙型肝炎和HFRS患者标本,间接法检测IgM的敏感度明显低于捕捉法;检测经二巯基乙醇处理后乙肝组和HFRS组标本,两种检测均为阴性,表明两种方法都具有针对IgM抗体的型特异性;交叉实验结果证明两种检测IgM的试剂均具有针对抗原的特异性。结论急性感染疾病的早期诊断、病毒的潜伏期感染和慢性感染的再次激活应使用捕捉法检测IgM,间接法检测IgM用于急性感染性疾病的诊断有待进一步探讨。     

Tribon M2在生产设计中的应用

介绍Tribon M2系统在船体平面建模中的应用,并对平面建模过程中使用的一些技巧和方法及出现的问题提出了几点看法.     

一类M/D/c排队网络的灵敏度分析

提出一类针对散货码头货运列车集疏港生产调度的M/D/c排队网络,建立生灭过程模型,利用排队网络系统的数学模型及查普曼-柯尔莫哥洛夫方程一般法则导出其性能指标的运算公式,并运用平滑摄动分析法做出该类型排队网络的平均服务效率对服务时间的灵敏度估计.分析方法在国内某大型散货码头调度策略仿真中得到较好的验证.