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In order to represent accurately and concisely the changing characteristics of one-dimensional spectrum density function in the chatter development. This thesis, for the first time, proposes the Edgeworth asymptotic expansion formulas of spectral density. A detailed proof is given. Some new statistic including spectral skewness, spectral kurtosis and spectral cumulants are proposed.
为了准确、简洁地表达一维谱密度函数在切削颤振建立过程中的变化特征，论文首次建立了一维谱密度函数的Edgeworth渐近谱展开式，给出了详细的证明；并由此提出了"谱偏态系数"、"谱峰态系数"和"谱累积量函数"等新的谱统计量。
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I am on an Oligocene beach, an Eocene beach, a Cretaceous beach -- the scene is the same.
我正在渐新统的海滩上，或在始新世的海滩上，或在白垩纪的海滩上——场景不变。
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Three series of source rocks in the basin are the third member and fourth member of Shahejie formation of Eocene and the first member of Shahejie formation of Oligocene.
盆地中三套主要的生油层系分别是始新统的沙河街组第三段、第四段及渐新统的沙河街组第一段。
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An important angiosperm flora was found in a sand-mudstone lens in Hanjiajing Formation of the Lower Oligocene from the basin, which changes the conditions that plant fossils of Palaeogene were seldom discovered in Northwest China, especially in Gansu Province.
在该盆地下渐新统韩家井组砂泥岩透镜体中一个重要被子植物化石群的发现，改变了我国西北地区尤其是甘肃省早第三纪晚期的植物化石几乎是空白的状况。
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Organic geochemical analysis shows that oils in the lower Oligocene reservoirs in Gas Hure,western Qaidam basin,are of typical salt lake origin and have the characteristics of both low mature oil and mature oil.
有机地球化学分析表明，尕斯库勒渐新统下部油藏原油为典型的盐湖相油，既有低熟油特征也有成熟油特征。
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Along the low-angle overthrust Early Permian marble and Early Triassic sandy slate were thrust southward over Paleocene-Eocene purplish red conglomerate of the Paleocene-Eocene Fenghuoshan Group and brick-red sandy conglomerate of the Oligocene Yaxicuo Group, forming many klippen of varying scales, and thick fault brecci.
沿低角度逆冲断层，早二叠世大理岩和早三叠世砂板岩自北向南逆冲推覆于古新统—始新统风火山群紫红色砾岩和渐新世砖红色砂砾岩之上，形成大量不同规模的飞来峰；沿主逆冲断层发育厚层断层角砾岩与断层泥，局部形成碳酸盐质糜棱岩。
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Sangzhu anticline outcropped on the surface is virtually a pseudo-anticline, of which the Paleocene Artashi formation and the Eocene-Oligocene Bashibulake formation in the limbs are emplaced by the backthrust.
6地表出露的桑株背斜是一个&假背斜&。其两翼上对称分布的古新统阿尔塔什组与始新统—渐新统巴什布拉克组地层实际上是被反冲断层推到一起的。
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neogene：新近系
国际地层委员会(ICS)已将原来的第三系分为古近系(Paleogene)和新近系(Neogene),古近系的含义和原来的下第三系相同,包括了古新统、始新统和渐新统. 古近系的顶、底界线已经确定,顶界年龄为23.03 Ma,底界年龄为(65.5±0.3)Ma.
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Brontotherium：雷兽(属)
巨大的有蹄食草哺乳动物类的绝灭属王雷兽属(Brontotherium)动物. 化石见於北美的下渐新统. 是巨大的奇蹄动物雷兽的代表,雷兽与马有同一祖先,实际上雷兽可能来源于一种很类似曙马的动物. 王雷兽站立时肩高至少2.5米. 头骨虽然粗大又长,