非对称单筒双井技术在文昌13-2油田的应用

南海西部文昌13-2油田目前共有开发井12口,油田已经没有空井槽,为充分开发油田,提高采收率,确定在文昌13-2油田A平台内挂4个?762 mm井槽,采用单筒双井技术,利用平台125t修井机,在?762 mm隔水管内下入?339.7 mm套管和?244.5mm套管,并利用?339.7 mm套管进行单筒双井的固井作业,实现了在同一井槽内完成2口不同井身结构的水平井钻完井作业。以同一槽口A16h井和A17h井为例,介绍了非对称单筒双井钻井程序、工艺特点以及钻井期间注意事项。单筒双井技术在文昌13-2平台成功的应用,充分地利用了井口平台的空间,减少了工程造价,降低了开发成本,摸索出了一套成功经验。     

偏高岭土及其对油井水泥性能的影响

综述了偏高岭土特性及其在水泥混凝土领域中的应用情况,初步研究了偏高岭土对油井水泥性能的影响。结果表明,偏高岭土能显著提高油井水泥的抗压强度,表现出很强的火山灰活性,完全可以作为新一代的油井水泥掺合料。     

镁质瓷泥浆流变性能的改进

滑石质瓷是一种高性能瓷的材料，但由于其泥浆的稠化性及泥料塑性差，阻碍了滑石质瓷的大量生产。实验表明：引入长石作助熔剂并加入适量粘土，可以改进泥料塑性及泥浆流变性能，使烧成变形度小，机械强度提高，能较好地满足制品成型的工艺要求。实验中设计了多组配料，分析比较烧后试样的性能测试结果，确定最佳配方及烧结温度。     

植物措施多级护砌式跌水在治沟中的应用

植物措施多级护砌式跌水是目前沟道治理中行之有效的方法之一。本文就这种方法的实施效果、施工方法及注意事项等方面进行了说明。     

Computationally efficient direction-of-arrival estimation of non-circular signal based on subspace rotation technique

In order to solve the problem that the high computational burden of the multiple signal classification algorithm of non-circular signal (NC-MUSIC) in direction-of-arrival (DOA) estimation,a novel computationally efficient DOA estimation algorithm based on subspace rotation technique was proposed.Firstly,the partitioning of noise subspace matrix and the subspace rotation technique (SRT) were used to construct a new reduced-dimension noise subspace.Then,the two-dimensional peak searching was converted to the one-dimensional peak searching on the basis of the separation of variables and the orthogonality between the new reduced-dimension noise subspace and the space spanned by the columns of the extended manifold matrix.The proposed algorithm can enhance the computational efficiency by means of the conversion of the two-dimensional peak searching into the one-dimensional peak searching and the removal of redundant computations.Theoretical analysis and simulation results show that the proposed algorithm can reduce the computational complexity to less than 5% as compared to NC-MUSIC algorithm on the premise of ensuring the accuracy of DOA estimation.Especially,the efficiency advantage of the proposed algorithm is more obvious in scenarios where the large numbers of sensors are required.     

无线数字通讯在耙料机控制系统中的应用

以无线通讯方式实现多台PLC之间以及PLC与微机之间的数据交换，在遥控监控站上完成对移动设备的控制与监视。     

白酒中四大酸与酯平衡常数及其特定酒度下平衡比值的研究

白酒中酸与酯之间存在着动态平衡，低度白酒中由于在货架期内酸与酯之间重新平衡，对理化指标和口感质量都有较大影响。通过对酒中酸与酯的平衡常数及不同酒度下酸与酯的平衡比值的研究，为科学勾兑尤其是解决低度白酒在货架期内出现质量问题提供了理论依据，旨在把酸酯平衡问题引向理论研讨领域。     

一种基于H- 范数最优模型匹配的自适应控制算法

基于H_∞范数最小理论的最优模型匹配自适应控制器保证闭环系统与参考模型之间的误差传递函数在H_∞范数意义下最小,这种自适应控制器可以保证闭环系统稳定{BIBO稳定),而不管被控对象是否稳定,是否是最小相位。     

Electron spin resonance of DNA irradiated with a heavy-ion beam ([16]O[8+]): evidence for damage to the deoxyribose phosphate backbone

A major problem in the intensive care unit nowadays is the development of multiple organ dysfunction syndrome (MODS), a cumulative sequence of progressive deterioration of organ functions. While the pathogenic pathways of MODS remain to be elucidated, it is assumed that cells of the host defence system, especially the macrophages, are altered in their function. During the development of MODS it is assumed that macrophages are overactivated and that an exaggerated inflammatory response may contribute to its pathogenesis. In order to gain insight into the alterations of the functional status of the macrophage during the development of MODS, a series of macrophage functions was measured in the subsequent phases of zymosan induced generalized inflammation in mice. Male C57BL/6 mice received a single dose of zymosan intraperitoneally and groups of animals were killed after 2, 5, 8, and 12 days. Peritoneal macrophages were collected for in vitro assessment of the ADCC, the production of superoxide (O2-) and nitric oxide (NO), and complement mediated phagocytosis and intracellular killing of Staphylococcus aureus. A single intraperitoneal injection with zymosan resulted in a three-phase illness. During the third phase the animals developed MODS-like symptoms. Peritoneal cells from control animals produced very low to non-detectable amounts of O2- and NO, and the cytotoxic activity was also low. During the development of MODS, from day 7 onwards, the ability to produce O2- and NO2- became strongly elevated, as did the cytotoxic activity. These findings are in parallel with the development of MODS whereas the phagocytic and killing capacity remained essentially unaltered. The changes found could be detrimental for the organism, thus possibly contributing to the onset and development of MODS.     

EDTA络合滴定法定量测定油田水中SO42-的一项改进

测量油气田水中SO4^2-的EDTA络合滴定法在2000年及以后的石油天然气行业标准（SY／T5523（（油气田水分析方法》）中已废止。本工作发现稀释受测水样所用蒸馏水要消耗EDTA，导致测量误差。基于1992年版行业标准，提出了增加蒸馏水校正项的EDTA络合滴定法。将此改进方法用于含各种不同共存离子的自配盐水样中SO4^2-的测量，结果如下：不含SO4^2-的水样SO4^2-测量值均为零；测量结果不受共存离子种类和种数的影响；测量值的相对误差随SO4^2-质量浓度P的增大而减小，P〉1000mg／L时为0、4％～1．0％，P在227．30～755．50mg／L范围时为-5．8％～＋5、8％。均与ICP法十分接近；P在34、97-78、05mg／L范围时测量值相对误差为-8.9％～-13．1％；P低于30mg／L时测量误差很大，此法不适用。重量法用于盐水样中SO4^2-测量时误差很大或测不出。此法用于梁南地层水中SO4^2-的测量，测量值相对于ICP法测量值（340．40～1082．36mg／L）的误差为-2．2％～＋5．1％。表3参4。