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.     

跨断层测量中点位稳定的相对性

本文利用云南省跨断层短水准测量资料,提出且证实了一个新的观点:在地震平静期点位基本稳定的条件下,地震前不同测点间的不同变化是一种地震前兆信息。     

An installation system of deepwater risers by an S-lay vessel

Along with the consumption increase of the petroleum products,more countries have transferred their attentions to the offshore fields,especially the deepwater oil and gas reserves.For deepwater exploitation,the risers must be installed to act as the conduits connecting surface platforms to subsea facilities.In this paper,the typical risers sorted by different classes are introduced,and the correspondent installation methods are presented.By investigating the recent projects performed in the deepwater hot spots,and combining the challenges of HYSY201 for riser installation,a lifting device developed for assisting riser installation is proposed and detailed to satisfy the installation of deepwater risers in the LW3-1 Gas Field of in the South China Sea.Tests on both the functions and performances of such a new system exhibit the satisfaction of meeting all challenging requirements of HYSY201 for application to riser installation in waters up to a depth of in the South China Sea.     

不同时次地基微波辐射计反演产品评估

利用北京大型活动期间探空和微波辐射计资料,采用统计方法进行评价分析,目的是了解该型微波辐射计的性能。结果表明:①总体平均:对温度,有降水时误差变化范围大,无降水时相对比较小,比较平稳;无降水时比有降水时更接近于探空观测结果。对相对湿度,误差的变化与温度比较相似,但从相对误差的变化来看,有降水时比无降水时小。无降水时反演的相对湿度与探空的比较一致。②不同时次:对温度,无降水时统计量随高度的变化规律性比较明显,趋势一致;有降水时的规律相对较差。无降水时,20:00误差比较小,比较接近探空;14:00误差比较大。有降水时,各时次误差比无降水时大,反演的20:00温度变化曲线与探空最接近。对相对湿度,无降水时统计量随高度的变化规律性比较明显,趋势较一致;有降水时的规律性相对比较差。总体来看,降水对微波辐射计影响较大,反演的20:00的资料误差小一些,5000m高度上下误差变化比较大,与云层有关。     

地震前兆数据多线程采集与多目标入库应用研究

利用可实例化的智能线程池技术,通过两个线程池分别实现了前兆数据的并行数据采集与数据的多目标入库,可自动实现对最近巧天内的数据进行检测与采集,采集仪器的数量由原来的几台、十几台提高到上千台,大大提高了地震前兆数据的采集效率;通过数据的多目标入库,数据由台站到区域中心以及国家台网中心的同步速度也得到很大提高.     

回溯时间积分格式的有效性研究

采月正压准地转模式作为动力核,用Rossby-Haurwitz波函数作为理想场,同时使用回溯时间积分格式和普通中央差格式进行数值试验.结果表明,在短时积分的情况下,回溯格式能减小数值解误差1～2个量级,而且它对时间步长的增大不敏感.因此使用回溯格式可以减少积分计算量,延长积分时效.     

腐植煤中的超细纹层

利用超薄切片透射电镜分析技术，在华北东部太原组和山西组、吐─哈盆地侏罗系腐植煤中检出了超细纹层。超细纹层在腐植煤中呈分散状、间隔状和密集状，前二者主要存在于无结构镜质体中，后者则存在于沥青质体或层状藻类体条带中。超细纹层来源于微藻类细胞的抗分解外壁，是藻类在超微层次的重要表现形式。腐植煤形成过程中藻类的贡献较藻类体数量所反映的要高。     

Provenance System Analysis of the Nantun Formation of the Huhehu Sag in Hailar Basin

Huhehu Sag is a new battlefield for the future oil and gas exploration in the Hailar Basin. At present, exploration of this area stays at a low level and the understanding of the provenance system of the Nantun Formation is comparatively weak. So, to carry out the detailed depiction of the provenance system in the study area is significant for the sedimentary system reconstruction, for the prediction of reservoir distribution and favorable areas. Based on comprehensive analysis of paleogeomorphy, light-heavy mineral and seismic reflection features, sandstone thickness and sandstone percentage, this paper analyzes in detail the provenance system of the Nantun Formation in Huhehu Sag from various angles and levels. It shows that provenances of the Huhehu Sag mainly originated from the eastern Xilinbeier Salient and western Bayan Mountain Uplift. The provenances surrounding the lake basin converged to the center of the basin, among which, the steep slope belt and the gentle slope belt are the main provenances, and the southern uplift is a secondary one. The distribution framework of the provenance fundamentally determines the distribution rules of the depositional system and its sand body developing during the Nantun period.