2,6—二特丁基—4—甲酚碘氧化合成二聚体的研究

报道了在氢氯化钾的甲醇溶液中,碘氧化２,６－二特丁基－４－甲酚生成稳定的苯氧基化合物Ｉ,并对反应条件进行了研究,实际结果表明,碘氧化２,６－二特丁基－４－甲酚合成１,不仅操作简单,而且产率高达９０％以上。     

紧邻地铁基坑支护工程设计

紧邻地铁基坑支护必须确保地铁运营的安全,具有难度大、支护安全储备高的特点。结合广州市林和村改建项目A地块临近地铁基坑支护工程实例,通过三维数值分析计算,基坑位移、稳定性均可满足设计要求。并对薄弱点进行加强监测。最后通过实测值复核计算值,实测值基本控制在计算值范围内。     

A New Platy‐armored Worm from the Early Cambrian Chengjiang Lagerstätte,South China

Abstract The Lower Cambrian Chengjiang Lagerstätte provides a good window to explore the origin and radiation of early bilaterians. Here we describe a netted sclerite‐bearing worm Tabelliscolex hexagonus gen. et sp. nov., and tentatively assign it to palaeoscolecidans of priapulids. The cuticle of the animal is covered with two kinds of platy sclerites which are constructed by hexagonally arranged tubercles. Similar structures of the sclerites can be seen on some Cambrian palaeoscolecidans and lobopods, so, this new species is critical for understanding the relationships between lobopods and palaeoscolecidans.     

孢粉记录揭示的4000 a BP来乌鲁木齐河源区气候环境变化

对乌鲁木齐河源大西沟气象站附近热融塌陷剖面的分析,重建了该区4000aBP以来的气候演变序列.结果表明:近4000aBP以来乌鲁木齐河源区气候经历了多次干湿变化,即4000～3630aBP为干暖期,3630～2270aBP为凉湿冷湿期,2270～2100aBP为干暖期,2100～1310aBP干暖转化为暖湿期,1310～1100aBP为干暖期,1100aBP至今是凉湿冷湿期.发现本区气候具有典型的西风带影响下的变化特征,遵循暖干同期、冷湿同期的规律;部分层位反映的暖湿气候说明东亚季风强盛时期,可以深入到乌鲁木齐河源地区.     

建立储层四维地质模型的新尝试——以冀东高尚堡沙三段储层模型的建立为例

油田注水开发过程中，储层物性、微观孔隙结构和非均质性都会发生动态变化。建立反映储层性质动态变化的四维地质模型对于深化高含水期油田地质特征的认识、预测剩余油的分布规律、提高油田开发效果具有十分重要的地质意义。论文立足于油田开发过程中储层的动态变化，以冀东高尚堡沙三段储层建模为例，综合不同开发阶段的井网及相应的取心、测井和实验测试资料，研究注水过程中储层参数的变化规律，应用随机建模方法建立了不同开发阶段的储层三维地质模型，对储层四维地质模型的建立进行了有益的尝试，并在油田的实际应用中取得了较好的效果。     

塔河油田四区奥陶系裂缝特征及其成因机制研究

塔河油田四区以缝洞型油藏为主,裂缝是该区主要的油气疏导体系和储集空间,通过20余口井的岩心、薄片观察,结合FMI等各种分析化验资料,研究了裂缝的倾角、走向、长度、体积密度等几何参数,分析了裂缝的充填情况.在此基础上分析了控制裂缝形成的主要因素,包括构造作用、岩性、先期断裂、岩层结构等;探讨了裂缝形成的期次,将裂缝划分为四期:Ⅰ.前加里东期,Ⅱ.加里东期、Ⅲ.海西早期、Ⅳ.海西晚期-喜山期;进一步分析了裂缝形成的动力学过程.     

EH-4电磁成像系统在隐伏构造探测中的应用

EH-4电磁成像系统具有勘探深度大、反映成果直观、轻便高效等优点.本文介绍了EH-4电磁成像系统的基本原理、数据采集和数据处理方法,及其在云南西部探测构造深部延伸情况的应用.实践证明,EH-4技术在探测构造深部延伸的应用方面是有效的.     

Phytolith evidence for C4-dominated grassland since the early Holocene at Long Pocket, northeast Queensland, Australia

Preliminary phytolith analysis of ephemeral lake fill sediment at Long Pocket, near Toomba, northeast Queensland, Australia, indicates that a C4-dominated grassland with a minor woody component has been present in the region since ca. 8000 cal yr B.P. Based on the modern distribution of C4 and C3 native grasses in Australia, this suggests that mean summer temperatures of at least 14°C (ca. 10°C cooler than present) were maintained since the early Holocene. This interpretation is comparable with previous studies, which together imply that the establishment of C4-dominated grasses in central and northeast Australia occurred between the last glacial maximum (most likely after ca. 16,000 ¹⁴C yr B.P.) and ca. 7200 ¹⁴C yr B.P. (ca. 8000 cal yr B.P.). Taxonomic composition of the grassland appears relatively consistent since the early Holocene at Long Pocket and includes phytoliths comparable with those from modern Arundinoideae, Panicoideae, and Chloridoideae. Rare non-grass phytoliths are also present. A gradual decrease in abundance of saddle phytolith forms (attributed to Chloridoideae grasses) from the base of the record at ca. 6500-7000 cal yr B.P. suggests decreasing aridity throughout the Holocene. This trend could reflect a locally drawn out effect of the end of the postglacial arid period due to the well-drained basalt flow catchment maintaining a local arid habitat for the Chloridoideae grasses.     

2,4—二硝基苯基重氮氨基偶氮苯测定矿石及煤矸石中痕量镉

作者合成了新显色剂2,4-二硝基苯基重氮氨基偶氮苯,并研究了试剂性质及其与Cd(Ⅱ) 的显色反应。在Triton X-100存在下,于pH 11.8的Na_2B_4O_7-NaOH缓冲溶液中,显色剂与Cd形成2:1的红色络合物,λ_(max)为525nm,ε=1.68×10~5l·mol~(-1)·cm~(-1),Cd(Ⅱ)含量在0—6μg/25ml范围内遵守比耳定律。将该体系应用于萃取分离-光度法测定矿石及煤矸石样品的痕量镉,结果满意。     

综合物探方法在黔西北某铅锌矿勘查中的应用

黔西北某铅锌矿区位于乌蒙山区中部,结合其成矿背景,根据区内100~800 m不同深度铅锌矿的矿体特征,选择激电中梯扫面、激电三极测深以及使用两种不同探测深度的设备( EH?4与V8)进行音频大地电磁测深等不同的物探方法组合,推测了物探异常,指导地质施工了10个钻孔,均见到了工业矿体,扩大了矿区铅锌矿资源量。根据本次综合物探方法的应用效果,提出了针对本区不同类型的铅锌矿勘查所对应的综合物探方法,对下一步找矿突破起到了一定的作用。