地层承压能力的影响因素分析

对于低压易漏井,或多套压系统下的地层,常常因地层承压能力差而发生井漏事故。本文详细总结了地层承压能力的影响因素,并对其进行了深入研究和探讨,对提高地层承压能力的室内试验及现场研究提供了重要的参考。     

ZnO-Al_2O_3-B_2O_3-SiO_2系微晶玻璃与可伐合金的润湿性能

研制了一种新型的与可伐熔封的ZnO-Al_2O_3-B_2O_3-SiO_2系微晶玻璃,研究了不同工艺条件下微晶玻璃与可伐合金间的润湿角大小,结果表明,熔封气氛和熔封温度对润湿性能影响很大,熔封时间影响最小.采用最佳的工艺条件,其润湿性能与现有的其它玻璃润湿性能相似.同时发现玻璃与可伐合金间的润湿角保持在10°～30°之间能得到质量良好的熔封产品.在基本不改变传统工艺制度的条件下,可完成锌铝硼硅系微晶玻璃与可伐合金的熔封,即利用排蜡过程同时完成微晶玻璃的形核,熔封后在稍低温度保温或减慢冷却速度可以完成微晶玻璃的结晶过程.锌铝硼硅系微晶玻璃与预氧化可伐合金的封接依靠玻璃中的SiO_2与FeO或Fe_3O4发生界面反应形成牢固的结合.     

江苏老区油田滚动开发的关键技术和措施

江苏老区油田分布在苏北盆地东台坳陷的高邮、金湖、海安凹陷及吴堡低凸起上 ,均为复杂小断块油田。老区滚动开发的关键在于提高圈闭的落实程、搞清砂体的展布及油气聚集的深化研究等 ,并且要把三维地震构造精细解释、钻后反馈、油藏深化评价贯穿于老区油田滚动开发的全过程。多学科综合研究采用的关键技术有 :三维地震技术、测井分析技术、构造研究技术、储集层研究技术、断层封闭性研究技术、动态分析及油藏数值模拟技术。以宋家垛、黄珏油田为例 ,具体运用了全三维处理解释技术、SEIMPAR多信息反演技术 ,发现了 3个含油断块 (宋家垛油田 )、增加探明储量 4 2 2 .3× 1 0 4t(黄珏油田 )的显著成果。图3参 1     

络合剂对化学水浴沉积 ZnS薄膜的影响

采用不同络合剂化学水浴沉积ZnS薄膜,应用台阶仪、SEM、XRD、波谱仪等手段测定了ZnS薄膜的厚度、表面、物相结构及透过率等.结果表明,氨水体系沉积薄膜速度明显慢于另外两种体系,沉积的ZnS薄膜都为立方结构.柠檬酸钠体系沉积的ZnS 薄膜结晶和透过率最佳,但薄膜表面缺陷较多;氨水-联氨体系沉积的ZnS薄膜表面质量最佳,结晶和透过率也较好;氨水体系沉积的ZnS薄膜质量较差.用3种体系沉积的ZnS薄膜用于制备铜铟镓硒Cu(In,Ga)Se2太阳电池,氨水和氨水-联氨体系沉积的ZnS薄膜制备的电池转换效率明显高于柠檬酸钠体系沉积的ZnS制备的太阳电池.     

新型聚丙烯酰胺/碳纤维/石墨导电水凝胶的制备

以N,N'-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,丙烯酰胺为单体,碳纤维与石墨为导电填料,采用水溶液聚合法制备了聚丙烯酰胺/碳纤维/石墨高吸水性复合材料,吸水后形成导电水凝胶.考察了交联剂用量、引发剂用量、单体浓度、反应温度、吸水倍率及导电填料用量对凝胶电导率的影响.实验结果表明,当交联剂用量为0.06%(质量分数),引发剂用量为1.0%(质量分数),单体浓度为50%(质量分数),反应温度为80℃,导电填料为35%(质量分数)时,水凝胶的电导率最高可达4.32mS/cm.并采用FTIR及SEM对样品结构及形貌进行表征.     

沈阳市大辛垃圾场废气发电的可行性分析

文章依据美国EPA的LANDGEM填埋垃圾场垃圾气体排放量的预测软件，对沈阳市新建生活填埋垃圾场废气甲烷的排放量、排放峰值时间、排放气体的特点做了预测。得出在沈阳市，垃圾场甲烷废气转换为能量是可行的。     

Inhibition of vascular smooth muscle cell growth by inhibition of fibronectin matrix assembly

The regulation of vascular smooth muscle cell (VSMC) proliferation by the fibronectin matrix was tested by treating human umbilical artery smooth muscle cells (HUASMCs) with a recombinant fragment of fibronectin (protein III1-C) that has previously been shown to modulate fibronectin matrix assembly. III1-C inhibited HUASMC proliferation by 75% to 90%. The inhibition of growth was time dependent; III1-C had no effect on DNA synthesis after 0 to 5 hours of treatment but did have an effect at 24 hours and beyond. III1-C did not stimulate apoptosis in these cells, indicating that the inhibition of proliferation was not due to an induction of programmed cell death. The effects of III1-C on cell growth were only specific for normal diploid smooth muscle cells. III1-C had no effect on the proliferation of IMR-90 fibroblasts, endothelial cells, NIH 3T3 cells, or the rat aortic smooth muscle cell line A7r5. However, III1-C did inhibit proliferation by primary rat aortic smooth muscle cells. An analysis of HUASMC fibronectin receptor (integrin alpha5beta1) distribution revealed that III1-C did not inhibit alpha5beta1 localization to focal contacts. Moreover, III1-C had no effect on the relative expression levels of seven different integrin subunits on HUASMCs. However, III1-C did inhibit fibronectin matrix assembly by rat aortic smooth muscle cells, HUASMCs, A7r5 cells, IMR-90 cells, and endothelial cells. An analysis of fibronectin synthesis indicated that the inhibition of fibronectin matrix assembly by III1-C was not due solely to a decrease in fibronectin synthesis. Finally, treatment of HUASMCs with anti-fibronectin monoclonal antibody L8 (which is known to inhibit fibronectin matrix assembly) also decreased the rate of HUASMC DNA synthesis. These results demonstrate that III1-C inhibits VSMC proliferation and suggest that this effect may be mediated by the inhibition of fibronectin matrix assembly.     

Two residues that may ligate Ca2+ in transmembrane domain six of the plasma membrane Ca(2+)-ATPase

In order to identify Ca2+ ligands in the putative transmembrane domain 6 of the plasma membrane Ca2+ pump, amino acids Asn879, Met882, Asp883, and Ser887 were singly altered. Asn879, Met882, and Asp883 were chosen because the corresponding amino acids have been proposed as Ca2+ ligands in the sarcoplasmic reticulum Ca2+ pump (Clarke, D. M., Loo, T. W., and MacLennan, D. H. (1990) J. Biol. Chem. 265, 6262-6267). For the alterations, a fully active truncated version of the pump was used, because the interaction of Ca2+ with the pump could be studied without interference from calmodulin binding. The mutants at Asn and Asp did not carry out ATP-supported Ca2+ uptake and formed no acylphosphate from [gamma-32P]ATP, suggesting that, like the corresponding amino acids in the sarcoplasmic reticulum Ca2+ pump, these two are Ca2+ ligands. However, all the mutants at the position of Met882 showed some activity. Indeed, the Met882--> Ile mutant was fully active at a saturating Ca2+ concentration and only the K1/2 for Ca2+ activation was shifted slightly upward. Converting the Met to Thr (which is the corresponding residue in the sarcoplasmic reticulum Ca2+ pump) reduced the activity to 20% of the wild type, further emphasizing the differences between the two Ca2+ pumps. The mutant Ser887--> Ala was expressed in greater amounts than, and had a specific activity about 50% higher than, the wild type, indicating that this serine also could not be a Ca2+ ligand and could not replace the missing Thr at position Met882.     

循环泵机械密封失效的原因分析与改进措施

分析了硅钢清洗段循环泵机械密封失效的原因,提出并实施了改进措施,使机封使用情况得到了很大改善,确保了循环泵的安全稳定运行。