大泵站超驼峰水位运行压缩空气断流系统的设计方法

阐述了压缩空气断流的原理，提出了压缩空气断流装置的一般构成和设计方法，首次应用气体喷射器作为压缩空气减压增量变换器，不但及时地增加了补气量，防止断流后流道压力的下降，而且大大减小了储气罐容积，使该项技术得以满足工程实际的要求，为同类泵站的技术改造     

漳泽水库最优兴利调度研究

漳泽水库供水能力下降。优化调度方式是提高水库效益的最有效途径。通过采用随机动态规划方法与模拟模型交互运算得到现行控制水位的水库优化调度图。采用同样方法对不同控制水位的水库运行方式进行优化调度，选出的规划水库最优控制水位为汛限水位９０４ ．５ ｍ ，正常高水位９０５ ．５ ｍ 。优化的控制水位方案在保障水库防洪安全的前提下可供给城市生活和工业用水６ ３００ 万ｍ３ ，较现行控制水位下的供水量提高１ ２５５ 万ｍ３ 。但农业用水仍然不足，应采取一定措施给予解决，如对灌区工程进行改造，因地制宜采取不同节水措施和污水回用等。     

水文系列随机插补的初步探讨

在水文分析计算中，当实测流量系列较短时，常采用回归直线来插补延长系列，但没有考虑机会余差的影响，因而使研究变量的方差偏小。本文讨论考虑随机余差后，如何展延系列进行频率分析计算。     

被Kerr介质包围的J—C模型中光场位相特性

本文应用Pegg-Barnett位相理论讨论了被Kerr介质包围的J-C模型中光场的位相性质。     

Late cytomegalovirus disease in marrow transplantation is predicted by virus load in plasma

Late occurrence of cytomegalovirus (CMV) disease after day 100 after bone marrow transplantation has become an increasing problem; whether a quantitative measurement of CMV DNA in plasma by polymerase chain reaction (P-PCR) could be predictive of such disease was investigated. In a prospective study, 117 subjects undergoing allogeneic marrow transplantation were followed for 120 days with weekly CMV blood cultures, with day 35 bronchoalveolar lavage CMV cultures, with weekly CMV P-PCR, and with clinical follow-up for an additional 1-2 years. Despite preemptive ganciclovir, CMV disease occurred in 9% of subjects, with a median time of onset of 176 days. Quantitative CMV P-PCR was associated with the late development of CMV disease (P = .01). Of 43 subjects with positive P-PCR results, 23% developed CMV disease, but no disease occurred in the 74 subjects with negative P-PCR (P < .001), despite the fact that 22% had CMV isolated from lung lavage fluid and 32% had CMV isolated from blood.     

甲烷和乙烷共同转化制乙烯的研究

甲烷和乙烷可以同时在Ｗ－Ｍｎ／ＳｉＯ２催化剂上得到活化生成乙烯。原料乙烷和甲烷体积比在０．１１～０．２５的范围内，当甲烷转化率为２０％左右时，共进料反应产物中乙烯体积浓度为８％～１２％，达到炼油厂催化裂化干气中乙烯的浓度。     

Growth of Helicobacter pylori in candle jars

OBJECTIVES: To examine stability of -glutamyltransferase (GGT) activity in stored serum from neonatal calves. ANIMALS: 10 commercial beef calves between 36 and 60 hours old. PROCEDURE: Serum samples were obtained from the calves, and each sample was divided into 8 aliquots. Serum GGT activity was measured on day 0 (fresh) and days 1, 2, 3, and 4 of refrigerated storage (4 C) and weeks 1, 2, and 3 of frozen storage (-20 C). RESULTS: Serum GGT activities for each of the refrigerated aliquots did not significantly differ from day zero, with serum GGT activity (expressed as a percentage of initial activity) > 99% on all 4 days. Serum GGT activity in frozen aliquots decreased significantly after 1 and 2 weeks of frozen storage, 97 and 98%, respectively; however, this decrease in GGT activity was not biologically significant. The observed GGT activity did not decrease significantly in the samples stored frozen for 3 weeks; these samples retained 99% of initial activity. CONCLUSION: The observed stability of serum GGT activity indicates that serum may be obtained, stored, and batch processed at a later time. This stability during storage is important to the success of a bovine passive transfer monitoring program based on GGT activity.     

立管系统中严重段塞流的一维瞬态模型

严重段塞流主要出现在下倾管段、紧接有一上倾管段或立管段的气、液两相混输海底管道中。根据严重段塞流形成的4个阶段,从一维瞬态流体力学方程出发,建立了一个简化的、准平衡态的严重段塞流数学模型,该模型考虑了流体的物性及流动瞬态效应,可对严重段塞长度、段塞周期、流动速度、压力等特性参数的变化进行模拟。与其他瞬态多相流模型相比,本文模型具有数学模型简单、计算效率高的特点。数值模拟结果表明:当管径较小时,无论介质是空气和水,还是空气和油,由本文模型计算得到的段塞周期和压力结果都与实验数据吻合较好;当管径较大时,若介质为空气和水,则本文模型计算结果与OLGA软件模拟结果较接近;若介质为石油和天然气,在模拟工况范围内,除了小气量工况下偏差较大外,本文模型计算结果与OLGA软件模拟结果相比,段塞周期偏差在25%以内,压力偏差在10%以内;此外,用本文模型计算液塞生长阶段时间t1比Saga-tun模型模拟结果更接近实测结果。     

永久式防倒灌隔水采油工艺在长庆油田的应用

长庆油田存在严重的套管腐蚀损坏,采取的主要治理措施是隔水采油工艺技术。原有隔水采油工艺存在隔采周期短、检泵时水层倒灌污染油层、多次隔采后坐封难度大等问题,为此,试验应用了永久式防倒灌隔水采油工艺。现场试验、应用表明,该工艺具有隔采成功率高、隔采周期长等优点,能有效防止检泵时上部水层倒灌污染油层,具有很好的应用价值和推广前景。     

隆德县大水沟饮水工程建设与管理措施分析

隆德县在大水沟农村饮水工程建设管理中，科学规划，优化设计方案，完善政策措施，创新管理体制和运行机制，尤其是用水户全过程参与工程建设管理、实行“两部制”水价、实施工程定期检查养护制度、建立工程管理单位目标责任考核制度、执行水费统一管理和提留统筹费等一系列做法．确保了国家投资效益的充分发挥和工程的可持续利用．