地层的

The Pb-Pb isochron of metamorphic argillite in Shuangqiaoshan Group is 1 490±68 Ma, while the Nd mode ages of Zhanggongshan Group, Shuangqiaoshan Group, Chenglang Group and Xiushui Group are 1.57 Ga, 1.89 Ga, 1.77 Ga, 1.60 Ga,respectively, less than 1.6-1.9 Ga, which suggest that they formed in Middle Proterozoic Subera.

研究结果还显示，双桥山群变质泥质岩的Pb-Pb等时线年龄为（1 490±68）Ma，而障公山群、双桥山群、程浪群和修水群的钕模式年龄分别为1.57 Ga、1.89Ga、1.77Ga和1.60 Ga，均分布在1.5～1.9 Ga之间，表明这些地层的形成年龄应小于1.9 Ga，是中—晚元古代的产物，同时表明扬子古陆南缘存在古元古代的基底。

One type of serious accidents occurred in mine exploitation is water irruption.

矿井突水灾害是煤矿开采中特大事故类型之一，因此采矿前期的一个重要的地质任务就是探测采区内构造的分布及地层的含水性，查明是否存在断层、溶洞、裂隙等对开采可能带来不良影响的地质构造。

And the key is to take advantage of the physical and chemical properties of shale or mud to enable the shale or mud to form a semipermeable membrane or form a high quality partition membrane on the wall of the well, so as to prevent the mud from flowing into the formation to effectively stabilize the wall of the well and protect the reservoir.

水基钻井液成膜技术是当今研究的热点，其核心技术是利用页岩或钻井液的物理、化学特性，使页岩或钻井液具有半透膜的性能或在井壁上形成一层较高质量的隔离膜，阻止钻井液向地层的进一步滤失，从而有效地稳定井壁和保护油气层。

The plug is used along with downhole eccentric water distribution device. When the pressure of produced fluid and the water-absorption ability of the reservoir change, the plug regulates automatically the size of the fluid outlet by means of the action of the slide valve and balance spring, thereby a stable flow rate can be obtained.

这种堵塞器与井下偏心配水器配套使用，当注水的来液压力或地层的吸水能力改变时，通过堵塞器内滑阀和弹簧的作用，自动调节出液口的大小，使水嘴前后压差基本保持不变，起到保持流量稳定的作用。

The results of quantitative coding to wavelet transform coefficient show that low-scale extreme wavelet coefficients can accurately localize the subaerial position of fractures.The shifting of extreme wavelet coefficients can be used to judge relative magnitude of dip angle and dip direction of fracture with scale increasing.The value of extreme wavelet coefficients can reflect density difference of formations on both sides of fracture and provide information of physical properties for fracture analysis.

小波变换系数量化编码结果表明，低尺度小波系数极值可以准确定位断裂在地表的位置；随着尺度的增加，小波系数极值会发生偏移，可以判断断裂的倾向和倾角的相对大小；小波系数极值可以反映断裂两侧地层的密度差异，为断裂分析提供物性信息。

The radiation en ergies from a point volume source and a radial stress source are directly proportional to ω〓, and the radiation energy from a tangential stress source is proportional to ω〓.

辐射进入地层的纵波能量约为横波能量的10％。N个单个源组成的阵列源的辐射能量是N个单个源单独辐射总能量的N倍。

New data reveal that the age of the so-called Gigantopteris Coal Series indifferent places of South China is not exactly the same and ranges from the late LowerPermian to the close of the epoch,while several elements of the Gigantopteris-Flora,such as Gigantopteris,Pecopteris,Annularia,Lobatannularia and Paracalamites mays...

新的资料证实，这一含煤地层的时代在各地不尽相同，它起自早二叠世晚期——茅口期并一直延续至二叠纪末。对二叠纪古气候所作的概略分析表明，整个二叠纪在华南都是成煤期，只要古地理条件有利，在早二叠世的栖霞期和茅口期以及晚二叠世的龙潭期和长兴期都可以生成煤层。

In addition, the two lithological strata containing fossils are differences in typical Baode the so-called "red Hipparion" climate temperature and humidity is a product of the period, and in the Linxia basin is close to a very sallow loess earthy heap, it may be reflected in a more dry and cold climatic conditions.

此外，两地含化石地层的岩性也有差异，在保德地区典型的所谓&三趾马红土&，是气候比较温湿时期的产物，而在临夏盆地则是一种很接近黄土的灰黄色土状堆积，它所反映的气候条件可能更为干冷。

The skeletons do exist, one being housed in the collections of the British Museum in London, and the report of the excavators indicate that more are in the limestone strata east of the village of Moule on the island of Guadeloupe in the Caribbean.

地层的快速形成。越来越多的证据表明，许多沉积岩几乎可以肯定是在数月，数日，几小时，甚至几分钟内沉积在一起的，而不是过去认为的需要数千年或数百万年的积累。

Because of its variety and lack of transgressive condensed section or coal bed, uniform mode of fluvial-alluvial sequence stratigraphy has not been concluded after twenty years application.

由于河流-冲积相沉积的多变性和缺少湖侵形成的密集段或煤层，其层序地层的研究经过多年的发展和应用，仍然没有统一的模式。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐