Petroleum systems in the Damintun Depression, Liaohe Oilfield

There are two different types of oils—high-wax oil and normal oil—found in the Damintun Depression of Liaohe Oilfield after several years of exploration and development, but their distributions and origins had confused the explorers in the oilfield. The introduction of petroleum-system concept shifts the view of geoscientists from geology and geophysics to oil, gas and their related source rocks. After detailed study, two petroleum systems have been identified in the Damintun Depression: (1) the ES42-Ar buried hill petroleum system (called the high-wax oil petroleum system) and (2) the ES41 ES34-ES4 and ES3 petroleum system (called the normal oil petroleum system). Based on the detailed analysis of the basic components, and all the geological processes required to create these elements of the two petroleum systems, it is put forward that targets for future exploration should include the area near Dongshenpu-Xinglongpu and the area near the Anfutun Sag. This provides scientific basis and has theoretical and practical meaning for the exploration and development.     

超声频谱在岩体物性测试中的应用

通过岩体后的超声波检测信号，携带了大量反映岩体物性的各种信息，可用以分析岩体的内部状态。本论述了对超声脉冲接收信号进行频谱分析，并提出一个频谱畸变系数Dxy，作为岩体完整程度的判据来研究岩体物性。     

英国的绥靖政策探析

二战爆发前后，英国鉴于自身国力衰 落，为保全其世界霸权地位，对法西斯德国采取了绥靖政策，它与英国传统的均势外交政策是连续性与中断性的统一。     

祁东煤矿地应力测量成果分析

采用应力解除法在祁东矿-408、-500和-600三个水平进行了原岩应力测试及计算，确定了祁东井田主应力的大小和方向以及三个主应力随深度的变化关系：祁东煤矿的地应力场以水平构造应力为主，最大主应力方向为北东向到近于东西向；中间主应力为垂直应力，垂直应力接近于上覆岩层的重量；最大主应力梯度值为0．029MPa／m，垂直应力梯度值为0．026MPa／m，最小主应力梯度值为0．023MPa，／m；地应力测量结果为研究祁东矿区域内各点的应力状态及应力场分布提供了理论依据。     

软岩巷道支护探索与实践

淮南潘一矿东二13槽岩石轨道下山属典型的软岩层巷道，采用单一高强度U型棚支护存在巷道变形快，不能有效地维护巷道；采用架、锚注联合支护方式替代原有单一的架U型棚支护的方式，增强巷道支护强度，降低了巷道返修率，保证了采区的正常生产接替和通风运输安全。     

基于遥感的成昆铁路泥石流病害的判译和治理对策

本以遥感资料为主要的信息源，对成昆铁路沙湾至泸沽段泥石流沟的数量，分布，发生，发展趋势与运动规律进行了判译分析，并根据若干因素划分了泥石流沟的严重等级及其对铁路的威胁程度等级。针对泥石流对铁路的威胁程度，结合地形，地质，水条件等因素，提出了治理对策，为遥感技术在工程地质病害调查和治理方面积累了经验。     

试析自然边坡卸荷变形的基本特征

对自然边坡卸荷带变形特点和影响边坡自然卸荷变形因素进行了综述,并结合工程经验提出了强卸荷带与弱卸荷带的划分依据,对自然边坡卸荷带的基本特征进行了探讨.     

The causal effect of an extra year of schooling on skills and knowledge in Latin America. Evidence from PISA

Abstract

In this paper, we estimate the causal effect of an extra year of schooling on mathematics performance for seven Latin American countries based on PISA 2012. To that end we exploit exogenous variation in students’ birthdates around the school entry cut-off date using both sharp and fuzzy Regression Discontinuity designs. We find strong effects of an extra year of schooling in most countries, which amount to a 30% increase in PISA test scores in Brazil, 18% in Uruguay, 7% in Argentina and 6% in Costa Rica. These effects differ from the typical estimates obtained from simple regressions or multilevel models and are large enough to allow 15-year-old students to reach higher proficiency levels, suggesting significant potential gains of reducing dropout rates in the region. Finally, we stress the importance of taking into account the effects of school entry cut-off dates on PISA samples to avoid making unfair international comparisons.     

对陈独秀中止国共"党内合作"主张的再认识

陈独秀曾极力反对国共"党内合作",后来又几次提出中共党员退出国民党的主张.其原因是随着革命的深入发展,国共关系日趋恶化,陈独秀感到国共"党内合作"的基础已遭到破坏.但国共"党内合作"是历史的选择,并且由于共产国际的坚决反对和中国革命的指导者采取了机会主义的平衡策略,从而使国共"党内合作"得以维持下来.     

网络化岩石物性实验设备的设计策略

介绍了用计算机网络模拟测量岩石物性仪器的方法。讨论了如何使用USB接口突破实验仪器和计算机数据传输的瓶颈，以及如何用多台计算机和一台实验仪器来完成岩石物性实验的方法。这种方法可以应用到地球物理实验的各个领域中去。