成品油管道站场安全仪表功能分析及改进措施

针对成品油管道输油站场安全仪表系统配置及逻辑设计的合理性进行了分析。选取输油管道站间远控阀室执行机构误动作这一常见事故,对安全仪表系统进行功能分析,优化安全仪表系统控制逻辑,对相关设备进行失效验证,找出可靠性低的设备,并对可靠性低的设备提出具体增加可靠性的措施,提高了安全仪表系统功能的有效性。     

中国农业碳排放的空间分异与动态演进——基于空间和非参数估计方法的实证研究

为研究农业碳排放的空间分布与动态演进规律，运用1993~2017年中国大陆29个省份的面板数据，在分省测算农业碳排放量和农业碳排放强度的基础上，将空间和非参数估计方法相结合，考察了中国农业碳排放的空间分异及其动态演进.结果表明：中国农业碳排放量呈“中心-外围”模式分布，且表现出向“外围”扩散的趋势；碳排放强度呈逐渐下降的趋势，表现为西高东低的阶梯状分布特征；碳排放的地区间差距不断缩小，农业碳排放的增长分布由“二主一小”向“一主”的格局转变，与此同时，中国农业碳排放还表现出由“两极”向“多极”转变的分布格局.     

Cleaner production for continuous digester processes based on hybrid Pareto genetic algorithm

ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｏｂｓｏｌｅｔｅｔｅｃｈｎｏｌｏｇｙ ,ｅｑｕｉｐｍｅｎｔ,ａｎｄｍａｎａｇｅｍｅｎｔ,Ｃｈｉｎａ′ｓｐｕｌｐａｎｄｐａｐｅｒｉｎｄｕｓｔｒｙｉｓｒｅｃｏｇｎｉｚｅｄａｓｂｅｉｎｇｏｎｅｏｆｔｈｅｍｏｓｔｈｉｇｈｌｙｐｏｌｌｕｔｉｎｇｓｅｃｔｏｒｓ.Ｉｔｓｐｌａｎｔｓｄｉｓｃｈａｒｇｅｄｏｖｅｒ3ｍｉｌｌｉｏｎｔ ａｏｆＣＯＤｉｎ 1 995,ａｃｃｏｕｎｔｉｎｇｆｏｒ 41 .8%ｏｆｔｈｅｏｖｅｒａｌｌｉｎｄｕｓｔｒｙｐｏｌｌｕｔｉｏｎｌｏａｄｏｆＣｈｉｎａ(Ｒｅｎ ,1 998) .Ｉｎｔ…     

遗传梯度法在水质数学模型参数估值的应用

介绍一种混合遗传算法－－遗传梯度法，并将其应用于水质数学模型参数估值，较一般优化算法能稳定得到的全局最优解。     

高炉煤气袋式除尘系统的问题及改进

钢铁生产会产生大量的煤气.袋式除尘是高炉煤气除尘的发展方向.对重钢高炉煤气袋式除尘系统问题的分析研究结果表明:要使钢铁企业煤气除尘系统更高效、低耗、环保的运行,必须采用灵活、可操作性强的煤气温度调节手段,选择适宜的阀门和喷吹控制方式,优化除尘灰的保温模式和卸灰设备的结构等.     

Modeling Prescribed Surface-Fire Regimes for Pinus strobus Conservation

Abstract:  We developed a simple model of   Pinus strobus L. stand dynamics to compare the impacts of different temporal arrangements of surface fires designed to reflect the application of fire as both an essential ecosystem process (natural fire) and as an efficient means of producing specific habitat features or other values (optimal fire). We used a stochastic simulation model of fire processes to estimate the mean fire-return interval that would maximize stand structural diversity. We investigated trade-offs between structural diversity and temporal population stability associated with changes in the fire interval and used a deterministic version of the model to explore the effects of scheduling fires at fixed intervals. In stochastic simulations, maximum structural diversity occurred at intermediate levels of disturbance (40-year mean fire interval). When fires were scheduled at fixed intervals, a longer, 100-year return interval maximized diversity. Mean fire-return interval was a mitigating factor in the diversity-stability relationship, which changed from positive to negative as the fire interval was reduced progressively from 250 to 5 years. As an alternative to scheduling fires at specified mean intervals, we developed a goal-programming model (a form of linear programming model) and used it to identify an optimal fire schedule for achieving habitat and visual-quality objectives. In comparison with the 40-year stochastic mean fire interval, which maximized structural diversity, the optimal schedule produced comparable levels of both diversity and fire frequency. Our results show how simulation and goal-programming models can be used to evaluate prescribed fire-scheduling alternatives and to explore the comparative advantages of natural and optimal fire-management approaches.     

拟威克酵母产生表面活性剂的发酵条件

通过单因子试验和正交试验,对拟威克酵母WickerhamielladomercqiaeY2A产生槐糖脂的发酵培养基组成和发酵条件进行了优化.培养基组成为:8.0%葡萄糖、8.0%菜子油、0.3%酵母粉;发酵条件为:初始pH值6.0、接种量2.5%、发酵时间120h.在此条件下,槐糖脂产量可达到41.3gL-1.图4表5参16     

AGA法及其在非线性数学模型参数估计中的应用

介绍了在基因算法基础上改进的加速基因算法（ＡＧＡ），并通过环境非线性数学模型参数估计实例对该法与传统参数估计方法进行了比较。初步结果表明，ＡＧＡ法直观、简便、拟合精度高、通用性强，易为广大环境工程技术人员理解和使用。     

筒形件无压边圈拉深工艺参数优化设计

通过对筒形件极限拉深系数的影响因素进行分析 ,确定合适的凸凹模圆角半径是提高拉深件质量的重要途径 ,将塑性理论和优化算法相结合 ,以筒形件达到最小的极限拉深系数为优化目标 ,对筒形件无压边圈拉深工艺参数优化设计进行了研究。并且通过具体算例证明了所采用的优化模型及算法是有效的     

低浊水处理效果优化研究

针对孚日家纺水厂出现的处理效果不理想这一问题，通过设计烧杯搅拌实验，研究不同混凝剂及与助凝剂PAM联用对低浊水浊度处理的影响。结果表明，单独采用聚合氯化铝铁PAFC比聚合氯化铝PAC混凝效果好，而与PAM联合使用比单独采用一种混凝剂的处理效果显著。从经济方面，对硫酸铝AS和氯化铁FC进行了试验分析，得出了硫酸铝AS与PAM联用，有可靠的除浊效果。