近岸海水质量量化方法及分类评价

近岸海域是陆地、海洋和大气之间各种过程相互作用最活跃的界面[1],沿海100km以内区域聚积着约60%的世界人口[2],其环境质量强烈受人类活动影响.对近岸海域进行水质环境管理,应依据海水物理、化学和生物学性质对海水进行分类评价[3,4].     

Cross-equatorial flow and its effects on the hurricanes occurrence over the Southern Hemisphere

Channels of cross - equatorial flow and their characteristics Winds at every 5 deg. grid point from 30°E to 180° over the equator at 850 hPa and 200hPa from December 1984 to February 1985 have been separated into U(zonal wind) andV(meridional wind).The V component has been used to represent cross- equatorial flow. FromFig. 1 we obtained that as during the Northern summer,there are also severa1 regions in which     

Investigation of the correlation between morphology and luminosity for two classes of main galaxies

Using an apparent-magnitude limited Main galaxy sample of the Sloan Digital Sky Survey Data Release 7(SDSS DR7), we investigate the correlation between morphologies and luminosity for the Main galaxy sample. Our Main galaxy sample is divided into two classes: Main galaxies only with TARGET_GALAXY flag (bestPrimtarget = 64), and ones also with other flags. It is found that for the second class Main galaxies, the early-type proportion monotonously increases with increasing luminosity nearly in the whole luminosity region. But for the first class Main galaxies, the early-type proportion increases with increasing luminosity only within a certain luminosity region (−22.2 < M _r  < −19.8). In the high luminosity region (M _r  < −22.2), the early-type proportion of the first class Main galaxies even decreases dramatically with increasing luminosity. We also analyze the correlation between morphologies and luminosity of galaxies around the peak of the redshift distribution ( 0.07 ≤ z ≤ 0.08 ). In such a narrow redshift region, we still observe strong correlation between morphologies and luminosity, which shows that this correlation is fundamental.     

基于眼部图像特征的肝肾疾病病证比较研究

目的：基于五轮学说及眼部图像特征提取技术,探讨不同证候（湿热内蕴证、肝郁脾虚证、肝肾阴虚证）的肝硬化及慢性肾脏疾病患者眼部图像特征及其差异性,以期从眼部图像特征上为肝硬化临床诊断及证候辨识提供数据支持。方法：选取2017年10月至2018年3月在上海中医药大学附属曙光医院肝硬化科住院的湿热内蕴证、肝郁脾虚证及肝肾阴虚证3种证候的肝硬化患者118 例为研究对象,运用眼科裂隙灯采集受试者的眼部图像,并以年龄、性别、体质量指数匹配的非肝病（慢性肾脏疾病）患者115 例及健康志愿者112 例眼部图像特征为对照进行比较研究。剔除因受到各种因素干扰眼部图像不符合要求的患者,最终3组各纳入60 例进行眼部图像分析。基于图像局部二值模式（LBP）特征提取法,将彩色图像转化为共生矩阵,计算图像LBP特征面积百分比。通过方差分析、秩和检验等统计学方法对相关指标进行比较分析,找出组间差异性。结果：肝硬化患者、慢性肾脏疾病患者与健康人3组眼部图像LBP特征面积百分比差异均有统计学意义（P＜0.05）。与健康人组相比,在255层面积百分比中,肝硬化组有245层差异有统计学意义（P＜0.05）,慢性肾脏疾病组有246层差异有统计学意义（P＜0.05）。肝硬化组与慢性肾脏疾病组相比,2组共有15层面积百分比差异有统计学意义（P＜0.05）。对2种疾病间不同证候的LBP特征频数面积百分比进行比较,慢性肾脏疾病患者湿热内蕴证、肝郁脾虚证及肝肾阴虚证3组证候间共19层差异有统计学意义（P＜0.05）,而肝硬化组患者3组证候间差异无统计学意义（P>0.05）。比较3种证候不同疾病间的LBP特征频数面积百分比,湿热内蕴证中,肝硬化与慢性肾脏疾病组患者间有54层差异有统计学意义（P＜0.05）;肝肾阴虚证中共有46层差异有统计学意义（P＜0.05）;而肝郁脾虚证的2种疾病间差异无统计学意义（P>0.05）。比较湿热内蕴证、肝郁脾虚证与肝肾阴虚证3种证候间频数面积百分比,发现有2层差异存在统计学意义（P＜0.05）。结论：基于眼部图像LBP特征发现,肝硬化及慢性肾脏疾病2种疾病间存在明显差异,且2种疾病的相同证候间比较亦有显著性差异,但同一疾病的3种不同证候间比较,仅肾脏病患者在一定程度上有差异,而肝硬化患者各证候间区分不明显。提示运用眼部图像LBP特征提取技术对不同疾病区分的敏感性优于对证候的区分。     

δ18O and δ13C in fossil shells of Radix sp. from the sediment succession of a dammed palaeo‐lake in the Yarlung Tsangpo valley,Tibet, China

A series of confirmed and suspected dammed palaeo‐lake sedimentary successions is scattered within the middle Yarlung Tsangpo valley in Tibet. However, the chronology, the genesis of the dam and its location, the water level of the dammed lake, the process of dam failure and the spatiotemporal relationships between the sedimentary successions remain controversial. Here, we focus on one sedimentary succession of the suspected dammed palaeo‐lake at Xigazê. We measured the grain‐size distribution, magnetic susceptibility, organic and inorganic carbon content, and δ¹³C_org and δ¹⁵N_total ratios of the sediments. In addition, we measured the δ¹⁸O_shell and δ¹³C_shell values of modern and fossil Radix sp. shells, and the δ¹⁸O_water and δ¹³C_DIC values of the ambient water with different hydrological regimes. The results indicate that the δ¹⁸O_shell values of modern Radix sp. and the δ¹⁸O_water of the ambient water body significantly depend on its hydrological status. In addition, a strong positive relationship was observed between δ¹⁸O_shell values of modern Radix sp. shells and the δ¹⁸O_water of the ambient water on the Tibetan Plateau. According to this correlation, the δ¹⁸O_water values of the palaeo‐water body are reconstructed using the δ¹⁸O_shell values of Radix sp. fossil shells in the Xigazê section. Further, based on the δ¹⁸O_shell values of fossil Radix sp., the reconstructed δ¹⁸O_water of the palaeo‐water body and the specific habitats of Radix sp., we infer that the sedimentary succession in the Xigazê broad valley was mainly formed within the backwater terminal zone of a dammed palaeo‐lake and that the elevation of the water level of the lake was approximately 3811 m a.s.l. AMS ¹⁴C dating indicates that the deposits of the dammed palaeo‐lake were formed at about 33–22 cal. ka BP. Finally, the presence of Radix sp. fossil shells within the Xigazê section suggests that Radix sp. survived the late Last Glacial Period on the Tibetan Plateau.     

考虑地表沉陷影响的复合地基承载力计算方法

受地下开采的剧烈扰动,采煤沉陷区的复合地基工程会发生非常大的下沉和水平位移,常规的承载力计算方法未考虑地表沉陷影响。在研究地表沉陷影响的复合地基承载特性的基础上,建立了考虑地表沉陷影响的复合地基受力模型,并且提出了考虑地表沉陷影响的复合地基承载力计算方法。通过一个采煤沉陷区桥梁复合地基工程实例的计算分析,发现考虑地表沉陷影响后,复合地基承载力有一定程度的下降。     

基于改进遗传算法的地下空区边坡稳定性分析

以边坡稳定性计算的非圆弧滑动面条分法为基础,提出一种改进的遗传算法。在无需对边坡最危险滑动面的几何形状进行假设的前提下,自由搜索最危险滑动面及其对应的最小安全系数。通过工程实例,将改进方法与其他方法进行对比分析,结果表明：该方法不仅准确可靠,而且总能搜索到全局最优解。该实例也表明：在其他条件不变的情况下,地下空区是导致边坡失稳的主要因素。     

基于SMS（短消息）通信的水文长观孔的远程监测系统设计

论述了远程水文监测系统的方案设计、系统组成、硬件配置、软件设计、工作原理、功能以及技术性能。该系统通过采集子站,将采集的数据整理后由GSM手机模块发送到监测中心进行处理,绘制出相应的曲线,并打印成报表。如果出现异常,则直接将相应信息发送到维修人员的手机上。监测中心还可以对采集子站进行远程参数设置、定时采集和电池电量等相关参数的监测。     

用离散单元法评价采煤巷道地面建筑适宜性

根据建筑物下部采煤巷道的断面尺寸、位置及埋深等地质条件,针对地面拟建建筑物的特点,分别应用二维及三维离散单元方法,对工程场地的地面变形进行了定量评价,得出了地面建筑物在巷道影响下的水平位移量及竖向位移量。结果分析认为,地下巷道的存在不会对上部建筑物造成威胁,仅会产生微小沉降变形。同时提出了一些工程安全措施,为工程建设的顺利实施提供了必要依据。     

阿尔金断裂东端破裂生长点的最新构造变形*

阿尔金断裂与祁连山北缘断裂的交汇部位是阿尔金断裂向东扩展的新破裂生长点,两断裂构造与新生的红柳峡断裂构成似三联点构造。破裂生长点附近的最新构造变形表现为:阿尔金断裂的旋转隆升和向北扩展;祁连山北缘断裂的逆冲推覆兼右旋走滑;红柳峡断裂的挤压拖曳弯曲,它们共同受制于青藏高原的强烈隆升和向外扩张作用。推测阿尔金断裂自西而东的破裂扩展就是似三联点构造逐一形成而又被切割贯通的过程。阿尔金断裂以蠕滑活动为主,2002年玉门地震与祁连山北缘逆冲断裂及其伴生的调节断层的活动相关。