Transcript profiles of mitochondrial and cytoplasmic manganese superoxide dismutases in Exopalaemon carinicauda under ammonia stress     

任海  李健  李吉涛  刘萍  梁忠秀  吴建华 《中国海洋湖沼学报》2015,33(3):714-724

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Seasonal variations in fouling diatom communities on the Yantai coast     

杨翠云  王建华  于洋  刘苏静  夏传海 《中国海洋湖沼学报》2015,33(2):439-446

Fouling diatoms are a main component of biofilm,and play an important role in marine biofouling formation. We investigated seasonal variations in fouling diatom communities that developed on glass slides immersed in seawater,on the Yantai coast,northern Yellow Sea,China,using microscopy and molecular techniques. Studies were conducted during 2012 and 2013 over 3,7,14,and 21 days in each season. The abundance of attached diatoms and extracellular polymeric substances increased with exposure time of the slides to seawater. The lowest diatom density appeared in winter and the highest species richness and diversity were found in summer and autumn. Seasonal variation was observed in the structure of fouling diatom communities. Pennate diatoms Cylindrotheca,Nitzschia,Navicula,Amphora,Gomphonema,and Licmophora were the main fouling groups. Cylindrotheca sp. dominated in the spring. Under laboratory culture conditions,we found that Cylindrotheca grew very fast,which might account for the highest density of this diatom in spring. The lower densities in summer and autumn might result from the emergence of fouling animals and environmental factors. The Cylindrotheca sp. was identified as Cylindrotheca closterium using18 S rDNA sequencing. The colonization process of fouling diatoms and significant seasonal variation in this study depended on environmental and biological factors. Understanding the basis of fouling diatoms is essential and important for developing new antifouling techniques.  相似文献   

站式全景遥感影像展示方法与应用技术研究     

梁冰  杜萌  姚远  刘建华  杜明义 《地理信息世界》2015,(1):86-90

虚拟漫游技术已成功应用到社会各个领域,传统漫游技术如VRML(Virtual Reality Modeling Language)、Quick Time、PTGui(Panorama Tools)等存在集成难度大、建模时间长、投入成本高等问题。本文基于全景相机以及Pano2vr、Dynamic-Photo HDR、Photoshop等软硬件环境,研发搭建了一整套旅游景区全景影像采集与展示平台。该平台具有良好的沉浸性、多视角浏览、实现方法简单、搭建快速等优点,为旅游景点、酒店、历史文化名胜等场景的360度实景展示提供了有效地工程化解决途径。  相似文献   

一种COVID-19病例个体时空轨迹交互式提取与质量评估方法     

张国永  龚建华  孙麇  周洁萍  李文航  张利辉  汪东川  李文宁  胡卫东  樊鸿奎 《武汉大学学报(信息科学版)》2021,(2)

针对当前新型冠状病毒肺炎(coronavirus disease 2019,COVID-19)病例个体时空轨迹描述文本高度非结构化的特点,提出了一种基于自然语言处理(natural language processing,NLP)辅助的交互式轨迹提取方法,用于提高轨迹提取的效率和质量。设计了交互式轨迹提取和质量评估流程,研究并实现了地址分割与组合算法、轨迹质量评估算法等关键技术。以黑龙江本土COVID-19聚集病例为例,通过轨迹提取效率和质量对比实验,验证了该方法的有效性和实用性。实验结果表明,与无NLP辅助的提取方法相比,该方法的轨迹提取效率得到了显著提升;同时,依据轨迹定量可信度评价结果,人机交互式的提取方法还可有效解决算法轨迹自动提取中存在的轨迹点遗漏、位置错误等问题。  相似文献   

地图的哲学内涵及其作用探讨     

程思聪  肖建华  马祥元 《测绘地理信息》2021,46(1):127-129

通过分析哲学和地图本质特征之间的关联,探讨了地图的哲学内涵及其在实现地图目的中起到的作用,尝试在通过地图认识世界、改造世界的探索道路上寻根溯源,从强化根基的角度使地图在新时代发挥更大的作用。  相似文献   

Upper-air temperature change trends above arid region of Northwest China during 1960–2009     

Zhongsheng Chen  Yaning Chen  Jianhua Xu  Ling Bai 《Theoretical and Applied Climatology》2015,120(1-2):239-248

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Mesoscale dynamics and its application in torrential rainfall systems in China     

Shouting Gao  Zhemin Tan  Sixiong Zhao  Zhexian Luo  Hancheng Lu  Donghai Wang  Chunguang Cui  Xiaopeng Cui  Jianhua Sun 《大气科学进展》2015,32(2):192-205

Progress over the past decade in understanding moisture-driven dynamics and torrential rain storms in China is reviewed in this paper. First, advances in incorporating moisture effects more realistically into theory are described, including the development of a new parameter, generalized moist potential vorticity(GMPV) and an improved moist ageostrophic Q vector(Qum). Advances in vorticity dynamics are also described, including the adoption of a "parcel dynamic" approach to investigate the development of the vertical vorticity of an air parcel; a novel theory of slantwise vorticity development, proposed because vorticity develops easily near steep isentropic surfaces; and the development of the convective vorticity vector(CVV)as an effective new tool. The significant progress in both frontal dynamics and wave dynamics is also summarized, including the geostrophic adjustment of initial unbalanced flow and the dual role of boundary layer friction in frontogenesis, as well as the interaction between topography and fronts, which indicate that topographic perturbations alter both frontogenesis and frontal structure. For atmospheric vortices, mixed wave/vortex dynamics has been extended to explain the propagation of spiral rainbands and the development of dynamical instability in tropical cyclones. Finally, we review wave and basic flow interaction in torrential rainfall, for which it was necessary to extend existing theory from large-scale flows to mesoscale fields, enriching our knowledge of mesoscale atmospheric dynamics.  相似文献   

热带印度洋海温与西北地区东部降水关系研究   总被引：2，自引：0，他引：2  

杨建玲  李艳春  穆建华  王素艳  王敏  田磊 《高原气象》2015,(3):690-699

利用西北地区东部1961 2009年99个气象测站逐月降水量资料,以及Hardley中心逐月海表面温度(SST)资料,采用最大协方差分析(MCA)、相关、回归等统计方法,考虑扣除ENSO(El Ni珘noSouthern Oscillation)影响后,分析了西北地区东部降水量和热带印度洋SST之间年际、年代际变化关系。结果表明:前期冬、春季持续异常的热带印度洋海盆模与西北地区东部5月降水异常主模态存在显著正相关关系,通常超前1~2个季节的暖(冷)海盆模对应5月西北地区东部降水偏多(少),并且这种显著关系存在年代际差异,20世纪70年代中期之前两者关系不显著,之后两者关系加强,通过了0.05显著性水平检验。热带印度洋海盆模对西北地区东部5月降水的影响可能是热带印度洋海盆模"电容器"效应的一种具体体现。  相似文献   

我国西南地区斑岩矿床区域成矿环境   总被引：5，自引：2，他引：3  

秦建华  丁俊  刘才泽  张启明 《大地构造与成矿学》2010,34(2)

本文对我国西南地区斑岩Cu(-Mo-Au)矿床形成的区域成矿环境进行了总结研究。我国西南地区斑岩矿床,构造上位于全球特提斯斑岩成矿带东段,与青藏高原演化密切相关,形成于青藏高原演化不同阶段。我国西南地区斑岩矿床形成时代为晚三叠世、早白垩世、古近纪和中新世等4个时期。斑岩矿床形成的区域成矿环境具有多样性,包括俯冲造山岛弧、同碰撞、后碰撞和大陆转换板块边界等四类构造环境。根据斑岩矿床成岩成矿时代和成矿环境,我国西南地区斑岩矿床可划分为义敦-中甸印支期斑岩成矿带、玉龙-马拉松多古近纪斑岩成矿带、丽江-金平古近纪斑岩成矿带、冈底斯古近纪-新近纪斑岩成矿带和班公湖-怒江燕山期斑岩成矿带等五个成矿带。与世界上多数斑岩矿床一样,我国西南地区斑岩矿床与区域深大走滑断裂存在着明显的空间分布关系。  相似文献   

虚拟地理环境研究进展与理论框架   总被引：3，自引：0，他引：3  

龚建华  周洁萍  张利辉 《地球科学进展》2010,25(9):915-926

阐述虚拟地理环境的形成、发展与研究现状,并从"虚拟现实技术"与"虚拟现实"的相互关系探讨虚拟地理环境基本概念.从基本思想、系统结构、在线参与者社会组织水平、与GIS/数字地球的关系等角度,分析虚拟地理环境的特征.从数据、模型、表现以及协同4个方面,讨论了虚拟地理环境系统建设的关键技术与研究前沿.尝试建立了一个虚拟地理环境基本理论初步研究框架,认为在地理哲学思想层次应该重点研究复杂性人地系统、地理虚/实关系论、地理/遥感信息本体论,在地理/地理信息科学层次需要重点研究地理认知与思维、地理相似原理、地理计算模拟;同时讨论虚拟地理环境与面向"人"的地理信息科学、基于虚拟地理环境地理科学方法论,以及可计算人地关系的相关理论问题.  相似文献