用安全系统工程法解决储罐出入口管线应力问题

受地基不均匀下沉影响,中国石油抚顺石化分公司石油一厂油库车间部分贮罐出人口管线存在应力,而该应力的存在将导致管线拉裂、油品跑损,威胁安全生产。简要叙述了运用安全系统工程解决油库罐区因地基下沉而造成的储罐出入口管线存在的应力问题,及金属软管连接在石油一厂储罐中的应用。     

反浮选工艺流程的控制

根据反浮选影响因素,进行分层次管理,有针对性挖潜,先后从药剂、流程、设备等方面进行了改造和控制。     

坦克装甲车辆用高新材料技术

该文重点论述了新型隐身材料技术、新型装甲材料技术、轻质材料技术、导电塑料技术和智能材料与结构技术等在实现坦克装甲车辆轻量化、小型化、功能化方面的地位与作用,并结合国外发达国家对坦克装甲车辆的研制情况,提出了高新材料技术在坦克装甲车辆上应用的设想。     

未来坦克装甲车辆总体设计的一些新观点

该文主要从电磁兼容性设计、隐身防护设计、动力传动及辅助系统的集成化、一体化设计、驾驶室电气设备集成设计和人—机环境设计五个方面探讨了未来坦克装甲车辆总体设计的新观点,并对我国未来坦克装甲车辆总体设计提出了一些改进途径和方法。     

Predicting somatic cell count standard violations based on herd's bulk tank somatic cell count. Part II: Consistency index

The present study examines the capability of 1,501 herds in the Upper Midwest and the performance of statistical process control charts and indices as a way of monitoring and controlling milk quality on the farm. For 24 mo, daily or every other day bulk tank somatic cell count (SCC) data were collected. Consistency indices for 5 different SCC standards were developed. The indices calculate the maximum variation allowed to meet a desired SCC level at a given mean bulk tank SCC and were used to identify herds not capable of meeting a specific SCC standard. Consistency index method was compared with a test identifying future bulk tank SCC standard violators based on herds’ past violations. The performance of the consistency index test and the past violation method was evaluated by logistic regression. The comparison focused on detection probability and certainty associated with a result. For the 5 SCC levels, detection probability and certainty associated with a result ranged from 51 to 98%. Detection probability of all violators and certainty associated with a negative result was greater for the consistency index across all 5 SCC levels (by 0.7 to 7.4% and 2.1 to 5.1%, respectively). Control charts were plotted and monthly consistency indices calculated for individual farms. Charts in combination with the consistency indices would warn from 66 to 80% of the herds about an upcoming violation within 30 d before it occurred. They offer a proactive approach to maintaining consistently high milk quality. By assessing process capability and distinguishing between significant changes and random variation in bulk tank SCC, tools presented in this article encourage fact-based decisions in dairy farm milk quality management.     

Influence of variable milk quality premiums on observed milk quality

The objective of this study was to evaluate a premium program for very high quality milk in a US cooperative. Data were available on a monthly basis from a large US milk cooperative from April 1998 through December 2005. The data set consisted of 36,930 observations representing producer-months. The actual amount of the low bulk tank somatic cell count (BTSCC) premium varied from $0.15 per hundred pounds (cwt.) of milk to $1.00/cwt. with steps in between of $0.50 and $0.60 per cwt. of milk during the data collection period. Data analysis was done to evaluate the impact of the premium program on average BTSCC and on the probability of a producer to ship milk with <100,000 cells/mL in a given month. The results showed a strong effect of the premium program on both the average BTSCC and the probability of producing milk with very low BTSCC. On average, the BTSCC of all the milk in the cooperative was reduced by 22,000 cells during the high premium period. The probability of producing milk with BTSCC <100,000 doubled during some months of the high premium period from 4 to 8%, and an associated 10% increase in probability to produce milk below 200,000 cells/mL was observed. The data clearly indicate that premium offerings for very high quality milk affect the overall milk quality in the population affected by the premium. Producers responded to the high premiums and the overall impact on milk quality was substantial. We argue that the combination of a penalty program for high BTSCC milk with a premium program for very high quality milk (low BTSCC) provides a strong incentive for improvement of milk quality.     

基于时间序列分析和卡尔曼滤波算法的风电场风速预测优化模型

为提高风电场风速的预测精度,解决时序模型预测延时的问题,文章提出了一种时间序列分析和卡尔曼滤波相结合的混合算法。基本思路为：首先利用时间序列分析理论,对风电场风速信号进行非平稳建模,得到符合其变化规律的模型方程;其次通过得到的模型方程推导出卡尔曼滤波法的状态方程和观测方程;然后依靠卡尔曼预测递推方程进行预测;最后对某实测风速信号进行预测。实例分析表明：采用该混合算法可以提高预测精度,而且较好地解决了预测延时问题。     

变电站模块化建设研究综述

总结了户外型、户内型、地下型等常规变电站建设方式的特点和不足,分析了国内外变电站模块化的发展趋势,介绍了变电站模块化建设的基本方式和技术特点,提出了各模块的发展方向。文章还对模块化变电站目前的市场状况进行了调查和整理,预测了未来的市场情况,指出变电站模块化是相关技术发展的必然结果,具有较高的实用价值和技术优势,我国现阶段应在紧凑型开关柜、模块设计新技术、户外共箱式模块、全绝缘及全屏蔽的模块化变电站等方面进一步研究和完善,探讨更加实用的解决方法。     

软胶囊化胶收率影响因素研究

目的 确定影响软胶囊化胶收率的因素。方法 通过优化化胶的工艺流程, 采用控制变量法进行逐一排除, 优化化胶所需时间, 确定第1次抽真空时间、第2次抽真空时间、真空度大小是影响化胶收率的关键指标, 通过正交实验, 确定提高化胶收率的最佳组合。结果 经过实验验证, 投胶温度、煮胶时间、罐子搅拌桨速度是影响化胶出胶的时间的主要因素, 而第1次抽真空时间5 min、第2次抽真空时间10 min、真空度大小?0.070 MPa为提高化胶收率的最佳组合参数。结论 通过一系列的改善, 优化化胶流程, 缩短化胶所需时间, 并且通过一系列实验, 探索出提高化胶收率的最佳参数, 提高产品收率, 降低成本, 稳定产品质量。     

氮气球罐焊缝超标缺陷修复技术

通过对高含硫净化厂氮气球罐焊缝超标缺陷修复技术研究,高含硫净化厂氮气球罐焊缝超标缺陷修复技术,基本解决了在用氮气球罐现场修复难题,为国内同类设备检维修提供了经验。