硅烷自组装膜对碳钢表面的改性及缓蚀性能研究

采用分子自组装技术在碳钢表面制备了3-巯基丙基三甲氧基硅烷自组装膜(MPTS-SAM).通过原子力显微镜(AFM)观察了碳钢表面成膜过程,并对其表面粗糙度进行了分析;利用动电位极化曲线研究了该自组装膜对碳钢的缓蚀性能.结果显示:该自组装膜对碳钢具有良好的缓蚀性能,且经MPTS自组装分子膜改性处理的碳钢表面较平滑,粗糙度明显降低;硅烷分子的水解程度对自组装有一定影响,且随着组装时间的延长,自组装膜更完整,对碳钢的缓蚀效率更高.     

楔紧自锁螺母的特征分析

从楔紧自锁螺母和螺栓联接后的横截面形状特征讨论其抗横向振动的能力 .鉴于这种螺母有较好的防松性能 ,建议研究和开发这种楔紧自锁螺母 .     

Do caterpillars of Dryas iulia alcionea (Lepidoptera,Nymphalidae) show evidence of adaptive behaviour to avoid predation by ants?

Plants bearing extrafloral nectaries can attract wasps, bugs, and mainly ants. Ants can defend plants against herbivores by treating the plant as an extension of their own territory. We evaluated the efficiency of resting sites built by Dryas iulia alcionea larvae as protection against ant predation on their host plant Passiflora suberosa. The results showed that ants on P. suberosa have significant influence on the survival of D. iulia caterpillars. The use and construction of resting sites was recorded through the fourth larval stadium. A strong inverse relationship between the number of resting sites constructed per larva and the developmental stage of the larvae was observed. Additional results suggest that the efficacy of resting sites against cursorial predators decreases with larval development. The behaviour of constructing resting sites probably evolved by natural selection. It is likely that this behaviour was important for the ancestral lineage that gave origin to Heliconiinae genera Dryas, Dryadula and Phylaethria.     

滚动轴承的径向游隙及其选择

从理论上分析了滚动轴承径向游隙的重要影响因素。为提高轴承的使用寿命，降低噪声以及减少振动，应将其径向游隙控制在最佳范围     

胜利油田物探院网络安全体系的设计与实现

分析了胜利油田物探院网络安全现状和问题,就网络整体防病毒、入侵监测原理及应用、网络运营参数测量、协议分析等方面实施的安全措施进行讨论.     

层状反铁磁体低温性质的理论计算

用自旋波理论研究了层内是反铁磁性耦合的反铁磁体的低温性质，找到了零温及有限温区的子晶磁化强度和内能与层间耦合间的变化关系，并给出有了有限温区内磁比热和平行磁化率与层间耦合之间的变化关系．     

浅析技术实践社会评价观的演进

在人类社会发展过程中,人们对技术实践的社会评价观经历了从漠视技术论到技术乐观主义,从技术自主论到技术悲观主义,从适当技术论到生态技术主义的发展过程.由此所衍生的技术决定论、专家治国论、技术恐惧及反技术主义都曾对社会的技术选择产生过影响.技术生态主义是在可持续发展观指导下适合当代技术发展的正确的技术实践社会评价观.     

粗毛纤孔菌的化学成分及抗炎活性

采用大孔树脂分离、 LH20凝胶层析及高效液相色谱法, 从粗毛纤孔菌成熟黄色子实体中分离得到3个多酚类化合物, 用核磁共振、 质谱结合其理化性质鉴定化合物的结构, 并考察所得化合物的抗炎活性和细胞毒性. 结果表明： 所得化合物分别为phellibaumin A（化合物1）, phelligridin D（化合物2）和3′,4′-二羟基-5-［［11-羟苯基］-6,7-乙烯基］ 3,5-二氧杂 芴-5-酮（化合物3）, 其中化合物3为新化合物; 3个化合物对脂多糖诱导RAW264.7细胞产生的NO均具有抑制作用, 且呈剂量关系; 各化合物对RAW264.7细胞增殖抑制率均呈剂量依赖趋势, 当抗炎有效剂量为50 μmol/L时, 抑制率均远低于50%.     

关于反腐败的理性思考

“三个代表”思想是我们党的立党之本、执政之基、力量之源 ,是全面推进党的建设 ,使我们党永葆青春和生机而立于不败之地的根本要求。反对腐败是实践“三个代表”思想的重要内容 ,同时 ,反对腐败只有以“三个代表”思想为指导才能进行彻底     

Changes of Soil Enzyme Activities in Different Restoration Ages of Spruce Forests on the Eastern Qinghai-Tibet Plateau

Six soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase ) were chosen for investigation under different spruce forests with restoration ages of 4,10,16 years and an old-growth spruce forest over 400 years old in the eastern Qinghai-Tibet Plateau, China. Results showed that the activities of invertase, phosphatase, proteinase, catalase and peroxidase decreased in newly restored forests except for pholyphenoloxidase. With the development of forests after restoration, the activities of invertase, acid phosphadase, proteinase increased gradually. Our study also indicated that the soil enzyme activities were associated with surface soils and decreased with depths. This result suggested that in the earlier restoration stage the application of organic fertilizer may be more effective by surface addition to soils than deep addition.