南天山蛇绿混杂岩和中天山南缘糜棱岩的40Ar/39Ar年龄及其大地构造意义

⁴⁰Ar/³⁹Ar同位素年龄测定,获得南天山蛇绿混杂岩基质黑云母石英片岩单矿物黑云母的两个坪年龄分别为(370.0±4.8)Ma和(259.0±3.3)Ma;中天山南缘长英质糜棱岩单矿物黑云母的坪年龄为(250.5±7.9)Ma,二云母花岗岩单矿物白云母的坪年龄为(348.9±0.3)Ma。结合南天山古生代沉积特征和塔里木及伊犁-哈萨克斯坦板块古地磁数据的综合分析,提出南天山晚泥盆世至石炭纪早期完成向伊犁-哈萨克斯坦板块的B型俯冲,中-晚二叠世进行陆内A型俯冲造山的板块碰撞演化模式。     

地下巷道弹性位移反分析各种优化方法的探讨

探讨了６种最优化方法（鲍威尔法、单纯形加速法、阻尼最小二乘法、变尺度法、模式搜索法和变量轮换法）在巷道弹性位移反分析中的应用情况。从参数初始点的选择、收敛速度、收敛精度和可靠性方面评价了这６种无约束最优化方法的优劣。     

四川省冕宁县大顶山磁铁矿床成因探讨

大顶山磁铁矿床位于泸沽花岗岩体外接触带,铁矿体赋存于中元古界登相营群夕卡岩化大理岩中,呈似层状、透镜状产出,矿体与夕卡岩化大理岩关系密切;大顶山磁铁矿床是泸沽花岗岩体侵位过程中沿层交代的产物,其矿床成因属接触交代型矿床.     

双复杂介质条件下的反Q滤波偏移延拓算子研究

地下介质的非弹性吸收衰减效应造成地震资料中深层信号频带窄、能量弱、成像困难,因此需要对地层的非弹性吸收衰减进行补偿。在已有的补偿方法基础上,基于单程波方程,采用与品质因子和频率相关的复速度代替介质真实速度,将粘滞传播算子在频率-空间域采用连分式展开,得到相移项和补偿项,针对连分式的误差,在频率-波数域进行补偿校正,并用逐步累加法解决起伏地表问题。该方法提高了成像精度,有效补偿了由于地层非弹性吸收造成的振幅和频率损失。模型试算和实际资料处理表明,该方法具有一定的适应性和实用性。     

Application of in-seam directional drilling technology for gas drainage with benefits to gas outburst control and greenhouse gas reductions in Daning coal mine,China

Gas outburst disasters are becoming more serious as the underground coal mines become deeper in China, and a thick zone of deformed coal provides conditions favorable to coal and gas outbursts. The Daning coal mine’s main mining seam is the No. 3 coal seam with coal and gas outburst hazard, which often contains two normal coal sub-layers and one deformed sub-layer. Considering both the geological conditions of the coal seam and applications of the in-seam directional longhole drilling technology, a new schematic diagram of in-seam directional longholes for gas drainage is developed. The two borehole layout models of longwall panel and main entries for gas outburst disasters control have been successfully applied. The gas drainage rates of both models are >70 %, and the residual gas contents are both <8 m³/t, which can be considered that the gas outburst disasters were effectively controlled. To better guide gas drainage, gas drainage normal and failure modes have been obtained. Although in-seam directional longhole technology has been successfully applied for regional gas drainage with benefits to gas outburst control, there are also some problems that are detrimental to greenhouse gas reductions in gas drainage and gas utilization. The three main problems are air leakage failure in gas drainage, decreasing gas concentration and a low gas utilization ratio. To address the problems mentioned above, five improvements are suggested.     

最高最低气温突升突降概念模型预报工具初探

通过数理统计和气候分析的方法,得出百色单站24h最高最低气温突升突降的分布特征,进行区间划分和分型.利用概念模型预报方法进行研究,得出最高最低气温突升突降的概念模型预报工具.     

Development history and accessibility evolution of land transportation network in Beijing-Tianjin-Hebei region over the past century

From the development of modern transportation to the current era of high-speed transportation networks, the Beijing-Tianjin-Hebei (BTH) region has always played a national leading role in land transportation development of China. In order to explore the long-term evolutionary characteristics of land transportation in the BTH region, this paper utilized a temporal scale of 100 years to systematically interpret the development process of the land transportation network. Taking 13 cities within the BTH region as research anchor cities, we took into account “leaping” mode of transportation in order to investigate the evolution of accessibility. Our research shows the following results: (1) The land transportation network in the BTH region has undergone five stages of development: the initial period of modernization (1881–1937); the period of stagnation of transportation development (1937–1949); the network expansion period (1949–1980); the period of trunk construction (1980–1995), and the period of high-speed transportation network development (1995–present). The network structure centered around Beijing has existed from the outset of modern transportation development. (2) The accessibility spatial pattern of land transportation in BTH region has evolved from expansion along traffic corridors to the formation of concentric circles. The stratified circular structure of transportation in anchor cities has gradually developed into a contiguous development pattern. (3) There are clear hierarchical differences in the transportation structures of anchor cities. Beijing has always been at the top of this hierarchy, while the hierarchical position of Zhangjiakou has fallen noticeably since 1949. The Beijing-Tianjin region was the first region to form a short-duration transportation circle structure, while the transportation advantages of the central part of Hebei Province, which is located in the center of the BTH transportation region, have yet to be realized.     

915MHz亚铁磁共振升温效应的实验研究

为了改进肿瘤的微波热疗,我们进行９１５ＭＨｚ微波亚铁磁共振的实验研究。结果表明９１５ＭＨｚ微波象２４５０ＭＨｚ一样,有明显而尖锐的亚铁共振升温。实验测量了不同聚集状态,不同饱和磁化强度亚铁磁共振介质的共振升温并用鸡蛋清受热固化来显示共振升温度分布的影响。     

基于核心素养的初中地理单元教学设计探究--以“河流”为例

指向核心素养的单元教学设计利于学生知识建构以及知识和方法的迁移应用。本文通过对有关“河流”课标的解读与教材的理解,基于学情分析,在大观念引领下,构建了单元教学设计的一般方法,并探究了以“河流”为例的单元教学设计实例,最后进行了反思。     

Characters of the Pco2 and CO2 Flux in the East China Sea in Autumn

Pco2 of air and seawater samples from the East China Sea(ECS) were measured in situ in autumn, 1994,Ocean currents,terrestrial fluviation,biological activities,etc.,Pco2 char-acters in air and seawater were investigated,CO2 flux and its character in the East China Sea are discussed on the basis of the Pco2 profiles of air and seawater,It was clear that the nearshore was the source of CO2;and tht the oulter sea area was the sink of CO2; and that the shelf area of the EXS is a net sink for atmospheric CO2 in autumn.