A novel set pair analysis method based on variable weights for liquefaction evaluation

To ensure the safety of structures, high-speed railway and highway founded on liquefiable soils, liquefaction evaluation is a primary task. Herein, a dynamic set pair analysis method based on variable weights is introduced to assess liquefaction. A concept of connection degree of set pair consisting of the evaluation sample and the classification standard was described to interpret the uncertainty of liquefaction and relationship. Moreover, based on reward and penalty mechanism, state variable vectors were presented to assign composite weights of evaluation indicators in order to take into account impacts of indicator variation. And the integrated connection degree to each grade was calculated to evaluate liquefaction of the evaluated cases. Results from practical example and comparison with field investigation and extension method indicated that this proposed model used to evaluate liquefaction is feasible and effective. In addition, it can quantitatively describe liquefaction hierarchy of evaluated samples.     

Seasonal variation of airborne fungi of the Tiantishan Grottoes and Western Xia Museum,Wuwei, China

In this study, a systematic survey of cultural airborne fungi was carried out in the occurrence environments of wall paintings that are preserved in the Tiantishan Grottoes and the Western Xia Museum, China. A bio-aerosol sampler was used for sampling in four seasons in 2016. Culture-dependent and -independent methods were taken to acquire airborne fungal concentration and purified strains; by the extraction of genomic DNA, amplification of fungal ITS rRNA gene region, sequencing, and phylogenetic analysis, thereafter the fungal community composition and distribution characteristics of different study sites were clarified. We disclosure the main environmental factors which may be responsible for dynamic changes of airborne fungi at the sampling sites. The concentration of cultural airborne fungi was in a range from 13 to 1,576 CFU/m³, no significant difference between the two sites at the Tiantishan Grottoes, with obvious characteristics of seasonal variation, in winter and spring were higher than in summer and autumn. Also, there was a significant difference in fungal concentration between the inside and outside of the Western Xia Museum, the outside of the museum was far more than the inside of the museum in the four seasons, particularly in the winter. Eight fungal genera were detected, including Cladosporium, Penicillium, Alternaria, and Filobasidium as the dominant groups. The airborne fungal community structures of the Tiantishan Grottoes show a distinct characteristic of seasonal variation and spatial distribution. Relative humidity, temperature and seasonal rainfall influence airborne fungal distribution. Some of the isolated strains have the potential to cause biodeterioration of ancient wall paintings. This study provides supporting information for the pre-warning conservation of cultural relics that are preserved at local sites and inside museums.     

南极普里兹湾附近海域表层海流特征分析

利用第29次南极科考期间在普里兹湾海区释放的8个Argos漂流浮标所获的总计662 d的数据,对普里兹湾及其邻近海域的表层海流特征进行了分析,并和以前的研究结果进行对比,结果表明:普里兹湾西部和北部表层海流基本呈现向西的流动,说明此地区的表层海流以沿南极大陆的逆时针沿岸流为主。普里兹湾东部海流呈现先向南再向西或先向南再向北的流动,普里兹湾西北部海流呈现向南的流动。8个浮标平均流速在0.02—0.20 m·s~(-1)之间,最大流速为1.57 m·s~(-1),流速1.0 m·s~(-1)的大流速区主要集中在普里兹湾、克洛斯角外侧、达恩利角外侧海域,流速1.5 m·s~(-1)的大流速区只出现在普里兹湾、克洛斯角外侧两处海域。     

中国留学人员创业园分布及产业特征

以《中国留学人员创业年鉴》为基础数据,采用GIS空间分析技术,运用核密度估计法、L函数和最近邻层次聚类分析等方法,分析2006~2015年中国留学人员创业园空间分布规律以及园区产业集聚特征,结果表明：中国留学人员创业园集聚特征显著,而且随着时间的推移,其多中心趋势明显,集聚规模迅速增大,集聚强度呈“先升后降,但总体增大”趋势;主要集聚于长三角、京津冀和珠三角等地区,尤以前两者最显著,且三大集聚区的集聚强度与集聚规模差异明显,其中长三角留创园的集聚规模最大,京津冀集聚强度最高,而珠三角则比较复杂,其在很小空间尺度范围内服从集聚分布,而在较大空间尺度范围内则服从随机分布;基于不同主导产业的中国留学人员创业园依然集中于长三角、京津冀和珠三角等地区,其主导产业分布格局则差异显著,规律性不强。     

中国第26次南极考察南大洋碳通量评估

南大洋是大气CO2的重要汇区,而近几十年来这个汇出现了明显变化并成为了研究的热点。利用中国第26次南极考察期间雪龙船绕南极航行所获得的现场碳及相关参数观测数据,分析推导出海水pCO2及其主控因子(叶绿素和水温)之间的经验关系,并结合相关卫星遥感数据建立遥感外推算法,计算南大洋50°S以南海区碳通量分布,评估该海区对大气CO2的吸收能力。计算结果表明,2009年11月从90°E到90°W(顺时针方向),50°—75°S海域为CO2输送大气的弱源,平均输入大气通量为9.482 mol·m-2·month-1,碳释放量为0.001 779 5×1015gC;2009年12月从90°W—90°E(顺时针方向),50°—75°S海域为吸收大气CO2的弱汇,平均碳通量为-12.451 mol·m-2·month-1,碳吸收量为0.026 656×1015gC。将经验关系推导至该月份的50°—75°S整个南大洋的计算中发现,2009年11月南大洋为大气CO2的源,碳释放量为0.002 789 6×1015gC;在2009年12月南大洋为大气CO2的汇,碳吸收量是-0.003 503 5×1015gC。相比之前我们所观测的结果,南大洋的碳汇吸收能力呈现明显下降。     

干旱区工业有害废物处置场的选址及相关问题研究

利用新疆干旱区地理环境、气候特征对工业有害废物填埋处置场的选址、设计特点及安全性预测等问题进行了研究，以某工厂有害废渣填埋处置场为例结合有关固体废物安全填埋研究课题成果，对干旱区与湿润区有害固体废物填埋工作的特点做了分析对比，对填埋处置场（坑）的设计计算及安全性预测等提出了创新的观点和方法．对于在干旱、半干旱区既安全又经济地进行有害废物填埋工作有较高的参考价值．     

广东房地产业发展现状与前景分析

房地产开发热潮令理论界，新闻界和广大民众所关注，本文试图对广东省房地产发展的现状、特点及其主要问题作全面的分析，并提出解决问题的对策和建议，以及对广东省房地产业的发展前景作尝试性的探讨。     

GPS automatic monitoring system for outside deformation of Geheyan Dam on the Qingjiang River

In this paper, the background of developing GPS Automatic Monitoring System for outside deformation of Geheyan Dam is described concisely. The framework, precision and features of the system are stated in detail. Finally, the prospective application of the system is introduced.     

Experimental research on physical properties of saline soil subgrade filler in Chaerhan region

In order to improve the engineering stability of saline soil of high chloride content in the Chaerhan salt lake region, six typical characteristics saline soil samples were selected, and tests on their...     

黄河下游泥沙淤积的经验统计关系

以黄河下游历年实测水文泥沙资料为基础,运用多元回归分析方法,建立了下游河道淤积量与淤积强度的经验统计关系。揭示了不同粒径组泥沙的来量和它们在全沙中所占的比率对下游河道淤积特征的影响。同时,研究了高含沙洪水及清水基流对下游河道淤积的影响。