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??Dolomite is the most important rock type for the development of the Ordovician effective reservoirs in the Ordos Basin. Its genesis remains controversial due to its complex and variable rock texture and occurrence. In this paper, through analysis of macroscopic regional geological background, microscopic rock texture, mineralogy, and geochemistry, the Ordovician dolomites in this area are divided into three types, i.e. micritic–fine powder crystal, coarse powder crystal, and fine (medium) crystal. It is pointed out that they were formed in three different dolomitization diagenetic environments, namely, penecontemporaneous dolomization by evaporative pumping, mixture dolomitization of freshwater and magnesium-rich brine, and seepage-reflux dolomitization, respectively. In terms of horizon and spatial distribution, they represent the features of "strata-controlled" and "region-specific". The analysis of genesis provides the following findings. First, the three types of dolomitization are correlated to certain extent in terms of temporal–spatial evolution. In other words, they were all originated along with the deposition of gypsum mineral under evaporation background. Second, the main pore types, i.e. dissolved pores, intercrystalline pores, and organic framework, were respectively formed in three types of dolomites. They generally distribute in "specific" type of dolomite, which indicates that the pore genesis is closely related to dolomitization diagenesis environment. Third, the development and distribution of effective dolomite reservoirs is mainly subject to three types of elements, such as primary sedimentary faices belts, diagenetic environment controlling regional dolomitization, and sequence boundary caused by variation of relative sea level.     

自主筛选的高效好氧反硝化细菌脱氮性能的研究

从珠江水产研究所养殖池塘中分离出具有脱氮性能的好养反硝化细菌,通过形态染色、16S rRNA基因序列分析进行鉴定,测定菌在含氮模拟废水中的脱氮性能。结果表明,菌株BB18与Pseudomonas guguanensis(FNJJ01000024)具有99.31%同源性,初步鉴定为假单胞菌属,菌株在28℃,180r/min培养48 h,其氨氮去除率在18 h可达92.76%,硝态氮去除率在48 h可达80.60%,亚硝态氮去除率在24 h可高达90.95%。研究显示菌株BB18在养殖尾水除氮中具有良好的应用前景。     

以葡萄糖为原料结合生物发酵与化学合成制备酮泛解酸

D-泛酸(维生素B5)是一种重要的维生素,在饲料、化妆品和制药行业均有广阔的市场。酮泛解酸是泛酸生物合成途径的中间体,易内酯化为酮基泛解酸内酯,后者可立体选择性地转化为D-泛解酸,并进一步用于D-泛酸的生产。本工作提供了一种采用α-酮基异戊酸与甲醛经羟醛反应合成酮泛解酸的新方法。其中,反应物α-酮基异戊酸可由葡萄糖原料经发酵法生产。结果表明,以葡萄糖为碳源,经克雷伯氏肺炎杆菌发酵能高水平生产D-泛酸生物合成途径的关键前体—α-酮基异戊酸。采用商品α-酮基异戊酸开发一种新型的酮泛解酸合成方法;分析合成反应机理,确定总反应级数为1.87;经条件优化确定酮泛解酸合成反应的最佳pH=13,最佳温度为45℃,此条件下酮泛解酸转化率达83.5%。调节酮泛解酸溶液pH至强酸性,有助于其内酯化合成酮基泛解酸内酯。之后采用前述优化的方法,由流加发酵制备的25.2 g/L α-酮基异戊酸合成酮泛解酸19.9 g/L。最后通过异丁醇萃取、活性炭脱色、浓缩结晶方法进行产物提纯,调节酮基泛解酸内酯溶液pH在7~10范围内可使其开环转化回酮泛解酸。最终得到酮泛解酸及其内酯的纯品。本研究建立了以葡萄糖为原料通过α-酮基异戊酸中间体生产酮泛解酸的方法。该方法结合生物发酵和化学合成过程,采用廉价原料,具有绿色高效的特点,有望用于工业化生产泛酸。     

基于Web Services的异地异构数据库的集成

为了克服当前异地异构数据库集成办法的不足。介绍了Web Services这一分布式计算模型及其特点,提出了一种基于Web Services技术进行异地异构数据源集成的方法,它能把分布在异地的异构数据源通过 WebServices连接起来形成一个虚拟的数据库,为用户提供一个透明统一的接口,从而实现异地异构数据资源的共享和整合.     

某高度522m超高层结构振动台试验与理论分析研究

为验证8度抗震设防烈度区某522 m超高层结构的抗震性能,设计并制作了1/40缩尺结构模型,通过模拟地震振动台试验,研究结构在8度多遇、设防、罕遇地震作用下的动力特性,考察其在单向和三向地震动输入下的变形及损伤情况。此外,采用ABAQUS软件对结构进行了8度罕遇地震作用下弹塑性时程分析,考察了结构动力特性和位移反应,分析结构的损伤状态和薄弱部位,并与振动台试验结果对比。结果表明,该结构采用的巨型柱、巨型斜撑与环带桁架的外框筒和型钢-混凝土组合结构核心筒形成的双重结构抗侧力体系,具有较好的稳定性和结构效能,该结构在8度(0.3g)罕遇地震作用下未发生倒塌,能够很好地满足“小震不坏、大震不倒”的性能要求。     

Q235钢搅拌摩擦焊接头微观组织与力学性能分析

在焊接速度为100 mm/min和搅拌头转速为450 r/min的工艺参数下,采用钨铼合金搅拌头对3 mm厚Q235钢进行了搅拌摩擦焊试验,并对接头的微观组织及力学性能进行了研究. 结果表明,在该工艺参数下可以获得表面无缺陷、成形良好的焊缝. 焊后搅拌头表现出一定程度的磨损及氧化. 接头截面各区域承受不同的热力联合作用,经历了不同的组织转变过程,但均保持铁素体和珠光体组织. 接头显微硬度最大值位于焊核区. 接头拉伸断裂位置处于热影响区,拉伸断口呈韧性断裂特征.     

Effect of thermal treatment on energy dissipation of granite under cyclic impact loading

High temperature treatment causes thermal damage to rocks in deep mining. To study the thermal effect on the energy dissipation of rocks during the dynamic cyclic loading, cyclic impact loading experiments of heat-treated rocks were carried out using the splitting Hopkinson pressure bar (SHPB) experimental system. The correlations among the energy dissipation, energy dissipation rate, impact times, accumulated absorbed energy per volume, failure mode and temperature were analyzed. The results show that the reflected energy under the first impact increases and finally exceeds the absorbed energy when the temperature increases; however, the total reflected energy decreases above 200 °C. The absorbed energy under the first impact and the total absorbed energy all decrease as the temperature increases, the rates of which decrease accordingly. And the same phenomenon appears for the transmitted energy and the rate of the transmitted energy. On the contrary, the rate of the reflected energy increases with the rising temperature. When the temperature increases, the fewer impact times are needed to destroy the sample. In addition, the failure modes are different when the rock is treated at different temperatures; that is, when the temperature is high, even though the absorbed energy is low, the sample breaks into powder after several impacts.     

用HPLC测定羟基苯乙酸-N,N-二甲氨基甲酰甲酯含量的研究

以高效液相色谱法(HPLC)测定对羟基苯乙酸-N,N-二甲氨基甲酰甲酯的含量,采用Thermo Syncronis C18柱(250 mm×4.6 mm,5μm),以乙腈-水=30∶70(V/V)为流动相,流速1.0 mL/min,检测波长275 nm。结果表明,对羟基苯乙酸-N,N-二甲氨基甲酰甲酯在0.1~1.0μg范围内线性关系良好,加样回收率为98.8%,RSD=1.08%。该方法准确,便捷,重现性好,适用于对羟基苯乙酸-N,N-二甲氨基甲酰甲酯的含量测定及工业生产中的质量控制。     

巴西矿业投资法律制度概述

文章以巴西海外矿业投资为角度,主要从巴西的矿业资源概况、矿业权管理体系和外商投资法律体系3个方面为主要内容,比较系统地阐释了巴西矿业投资的法律环境,为投资者提供了具有时效性和实用性的相关信息,并给出了关于投资巴西矿业的若干建议。     

Study on AdaBoost-based link quality prediction mechanism

The link quality was vulnerable to the complexity environment in wireless sensor network.Obtaining link quality information in advance could reduce energy consumption of nodes.After analyzing the existing link quality prediction methods,AdaBoost-based link quality prediction mechanism was put forward.Link quality samples in deferent scenarios were collected.Density-based unsupervised clustering algorithm was employed to classify training samples into deferent link quality levels.The AdaBoost with SVM-based component classifiers was adopted to build link quality prediction mechanism.Experimental results show that the proposed mechanism has better prediction precision.