泥河湾盆地下沙沟动物群的磁性地层学定年及其对泥河湾动物群的年代制约

主要对泥河湾盆地下沙沟动物群（即狭义的泥河湾动物群）所在剖面河湖相沉积物进行了详细的磁性地层学和岩石磁学研究,揭示出下沙沟剖面记录了高斯正极性时（Gauss normal chron）晚期、松山负极性时（Matuyama reverse chron）及布容正极性时（Brunhes normal chron）。下沙沟动物群的层位跨越留尼旺（Reunion normal subchron）和奥杜威（Olduvai normal subchron）正极性亚时,其年代约为2.2~1.7Ma。上新世/更新世界限（高斯/松山（Gauss/Matuyama）地磁极性倒转界限）位于下沙沟剖面底部。结合前人研究结果,将泥河湾盆地已有磁性地层年代数据的动物群标注在地磁极性年表上,获得了泥河湾动物群的年代序列,结果表明泥河湾动物群位于高斯/松山和松山/布容（Matuyama/Brunhes）两个地磁极性倒转界限之间,因此,泥河湾动物群的年代区间为2.6~0.8Ma,这一研究结果完善了泥河湾盆地的生物地层年代学框架。     

2010年玉树Ms7.1级震区上地壳三维P波速度层析成像

综合利用震后应急流动台阵和青海台网部分固定台站观测数据,采用多震相走时层析成像方法,对玉树震区地壳三维速度结构和玉树Ms7.1级地震余震震源位置参数进行了联合反演,获得了研究区上地壳三维速度结构图像和余震序列重新定位结果.结果显示:玉树Ms7.1级地震余震整体沿北西向玉树-甘孜断裂呈条带状分布,长约120 km;以隆宝镇为界,呈现两段不同的分布特征;震区上地壳速度分布存在横向非均匀性;沉积层厚约6～7 km,壳内存在厚约为7～8 km的低速层;地震多发生于低速层上方即高、低速过渡区域,区内多条断裂走向与高低速过渡带一致.     

区域风能资源评价分析的动力降尺度研究

不同于以往的统计风能评估方法,本研究将动力降尺度方法应用到江苏省的风能评价分析中。利用NCEP/NCAR再分析资料与江苏省65个地面气象观测站1971～2000年的观测资料,建立了动力降尺度区域气候模式MM5V3的初始场和边界条件,用较高分辨率（水平分辨率为5 km）评估了江苏省60 m高度的风能分布,分析了动力降尺度方法在区域风能资源评估中的有效应用。结果表明,江苏省风能资源由东部沿海向西部内陆递减,以西连岛为代表的东部沿海风能资源最丰富,其次为长江三角洲地区,太湖、洪泽湖及高邮湖地区的风能资源也比较丰富,徐州市与南京市的风能资源最贫乏。分析表明,动力降尺度方法能够用较高分辨率模拟局地环流和地面风的主要分布特征,可以作为区域风能资源评价分析的有效手段。     

福建省海洋旅游文化与经济增长的协调均衡发展研究

文章以福建省沿海地区的旅游文化产业为研究对象,选取1998—2015年时间序列数据,构建向量自回归模型,对福建省海洋旅游文化与经济增长的关系进行理论分析和实证检验。结果表明:福建省沿海区域经济指标变量间存在稳定均衡关系,各地区产业集聚程度和经济发展情况存在差异,旅游业发展也不平衡。基于此,提出缩减地区差异和促进共同发展、加快公共服务体系建设、优化海洋旅游文化产业结构、坚持绿色可持续发展以及实施旅游目的地营销的措施建议。     

GPS定位技术在高层建筑施工基准传递中的应用

在高层建筑施工中，基准传递是一项极为重要的测量工作，为了满足现代建筑工程快速、高效、优质的施工需要，文中提出应用GPS定位技术实施施工基准定位的方法，并结合工程实测就作业过程作了阐述。结果表明，在超高层建筑的基准传递中，应用GPS是一种行之有效的新方法。     

A steady-state solution for warped accretion discs

We consider a thin accretion disc warped due to the Bardeen–Petterson effect, presenting both analytical and numerical solutions for the situation in which the two viscosity coefficients vary with radius as a power law, with the two power-law indices not necessarily equal. The analytical solutions are compared with numerical ones, showing that our new analytical solution is more accurate than the previous one, which overestimated the inclination change in the outer disc. Our new analytical solution is appropriate for moderately warped discs, while for extremely misaligned discs only a numerical solution is appropriate.     

Development of the Automatic Seeing Monitor for the Site Testing of Dome A

The Antarctic site-testing campaigns have shown that Dome C is an excellent astronomical site on the earth, it is better than any of existing mid-latitude astronomical sites in the world, because of its cold and dry weather, low infrared background radiation, continuously observable time as long as 3–4 months, clear and highly transparent atmosphere, low wind speed, and the absence of dust and light pollution. And in the international astronomical community it is generally believed that Dome A with a higher altitude may be better than Dome C as a potential excellent astronomical site. In the past 3 years, although held by the Center for Antarctic Astronomy of Chinese Academy of Sciences, the site testing at Dome A has preliminarily con?rmed the many advantages of Dome A as an excellent astronomical site, but the data about the atmospheric seeing, which is an important parameter for assessing the site quality for optical observations, have not been obtained until now. Hence, on the basis of a commercial telescope with the diameter of 35 cm, we have made the hardware reformation and software development to have it operate as a DIMM (Differential Image Motion Monitor), which can simultaneously monitor both the seeing and isoplanatic angle at Dome A automatically. At present this instrument has been shipped to Antarctica by the “Xuelong” exploration ship, and will be installed at Dome A, and begin to work in early 2011. Before the shipment, by through the comparative measurements together with an existing seeing monitor at the Xinglong astronomical station, the software, hardware, as well as the installation and adjustment of the instrument, are further veri?ed by testing.     

Numerical Simulations of Laminar Air–Water Flow of a Non-linear Progressive Wave at Low Wind Speed

A numerical simulation for two-dimensional laminar air–water flow of a non-linear progressive water wave with large steepness is performed when the background wind speed varies from zero to the wave phase speed. It is revealed that in the water the difference between the analytical solution of potential flow and numerical solution of viscous flow is very small, indicating that both solutions of the potential flow and viscous flow describe the water wave very accurately. In the air the solutions of potential and viscous flows are very different due to the effects of viscosity. The velocity distribution in the airflow is strongly influenced by the background wind speed and it is found that three wind speeds, $U=0$ , $U=u_m$ (the maximum orbital velocity of a water wave), and $U=c$ (the wave phase speed), are important in distinguishing different features of the flow patterns.     

Effects of grain morphology on critical state: a computational analysis

We introduce a new DEM scheme (LS-DEM) that takes advantage of level sets to enable the inclusion of real grain shapes into a classical discrete element method. Then, LS-DEM is validated and calibrated with respect to real experimental results. Finally, we exploit part of LS-DEM potentiality by using it to study the dependency of critical state (CS) parameters such as critical state line (CSL) slope \(\lambda \), CSL intercept \(\varGamma \), and CS friction angle \(\varPhi _{\mathrm{CS}}\) on the grain’s morphology, i.e., sphericity, roundness, and regularity. This study is carried out in three steps. First, LS-DEM is used to capture and simulate the shape of five different two-dimensional cross sections of real grains, which have been previously classified according to the aforementioned morphological features. Second, the same LS-DEM simulations are carried out for idealized/simplified grains, which are morphologically equivalent to their real counterparts. Third, the results of real and idealized grains are compared, so the effect of “imperfections” on real particles is isolated. Finally, trends for the CS parameters (CSP) dependency on sphericity, roundness, and regularity are obtained as well as analyzed. The main observations and remarks connecting particle’s morphology, particle’s idealization, and CSP are summarized in a table that is attempted to help in keeping a general picture of the analysis, results, and corresponding implications.