Evaluation and fusion of SST data from MTSAT and TMI in East China Sea, Yellow Sea and Bohai Sea in 2008

Two typical satellite sea surface temperature (SST) datasets, from the Multi-functional Transport Satellite (MTSAT) and Tropical Rainfall Measuring Mission Microwave Imager (TMI), were evaluated for the East China Sea, Yellow Sea, and Bohai Sea throughout 2008. Most monthly-mean availabilities of MTSAT are higher than those of TMI, whereas the seasonal variation of the latter is less than that of the former. The analysis on the one-year data shows that the annual mean availability of MTSAT (61%) is greater than that of TMI (56%). This is mainly because MTSAT is a geostationary satellite, which achieves longer observation than the sun-synchronous TMI. The daily availability of TMI (28%-75%) is more constant than that of MTSAT (9%-93%). The signal of infrared sensors on MTSAT is easily disturbed on cloudy days. In contrast, the TMI microwave sensor can obtain information through clouds. Based on in-situ SSTs, the SST accuracy of TMI is superior to that of MTSAT. In 2008, the root mean square (RMS) error of TMI and MTSAT were 0.77 K and 0.84 K, respectively. The annual mean biases were 0.14 K (TMI) and -0.31 K (MTSAT). To attain a high availability of SSTs, we propose a fusion method to merge both SSTs. The annual mean availability of fusion SSTs increases 17% compared to MTSAT. In addition, the availabilities of the fusion SSTs become more constant. The annual mean RMS and bias of fusion SSTs (0.78 K and -0.06 K, respectively) are better than those of MTSAT (0.84 K and -0.31 K).     

基于物联网的心音监测系统的设计与实现

针对行动不便或有长期监测需求的心血管疾病患者,研发了一套远程心音信号监测系统,在家中患者可以实现心脏状况的检测。系统由心音信号采集器、智能手机和远端监护计算机构成。心音信号经过心音信号采集器处理后,通过电信网络传送到医护中心的监护计算机上。借助于Visual C++6.0开发平台,系统实现了患者数据管理,对心音信号进行希尔伯特黄变换方法的去噪处理,对不正常心音情况进行疾病报警。系统成本低、安全无创,监护软件能够采集、处理、显示、存储、分析心音信号,文中通过对13例心音数据进行处理,验证了系统的有效性和可行性。     

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山东省GNSS基准站的建设

介绍山东省GNSS基准站土建、供电避雷、通讯以及仪器设备安装调试的技术工艺.     

内蒙古二连盆地洪浩尔舒特凹陷白垩系火山岩储集层

内蒙古二连盆地火山岩分布极为广泛,在古生界（含变质岩） 及中生界的侏罗系和白垩系均有分 布。位于盆地内乌尼特坳陷的洪浩尔舒特凹陷发育有３套火山岩,主要分布在白垩系阿尔善组上段、阿尔善组 下段和腾格尔组一段,火山岩主要为安山岩,次为凝灰岩和少量火山角砾岩。火山岩储集空间类型主要为气孔 和火山灰溶孔,孔缝组合类型有孔隙型、裂缝-孔隙型、孔隙-裂缝型和裂缝型。储集层物性受火山岩岩相、 成岩作用和构造活动影响,以岩相影响最显著。储集层发育总体上中央洼槽中部和东部较好。     

Exploration Opportunity Search of Near-earth Objects Based on Analytical Gradients

The problem of search of opportunity for the exploration of near-earth minor objects is investigated. For rendezvous missions, the analytical gradients of the performance index with respect to the free parameters are derived using the variational calculus and the theory of state-transition matrix. After generating randomly some initial guesses in the search space, the performance index is optimized, guided by the analytical gradients, leading to the local minimum points representing the potential launch opportunities. This method not only keeps the global-search property of the traditional method, but also avoids the blindness in the latter, thereby increasing greatly the computing speed. Furthermore, with this method, the searching precision could be controlled effectively.     

5种红树植物对Cu、Zn、Pb积累特征研究

大量研究表明红树植物对重金属具有一定的吸附功能。本研究选取东寨港红树林保护区为研究区域,选择不同年龄阶段的5种不同红树植物,分别是木榄(Bruguiera gymnorrhiza)、海莲(Brugui-era sexangula)、秋茄(Kandelia obovata)、角果木(Ceriops tagal)、桐花树(Aegiceras corniculatum),通过对不同类型、不同树龄阶段的红树植物组织(根、枝、叶)及其林下土壤样品的采集,分析测定样品中重金属元素Cu、Zn、Pb的含量,从而计算红树植物对土壤中重金属的富集系数,分析不同红树植物对重金属的吸附能力大小。结果表明:不同的植物类型及不同植物生长期对重金属吸附功能具有明显差异,其中大龄角果木表现为最大,小龄角果木次之,而中龄桐花树最小。不同植物组织中大龄角果木的根部对Cu的吸附能力最大,最小的是大龄木榄叶;对Zn的吸附能力最大的是小龄海莲枝,最小的是大龄木榄根;大龄角果木枝对Pb的吸附系数最大,中龄木榄根最小。总体而言,5种红树植物对重金属(Cu、Zn、Pb)的总吸附能力大小表现为:角果木>海莲>秋茄>桐花树>木榄,其中富集系数最大的角果木总值为5.8869,最小的木榄总值为2.4342。     

基于MSAP技术的海带DNA甲基化初步研究

DNA甲基化在调节基因表达和控制细胞分化过程中扮演着重要的角色,其作为表观遗传修饰形式之一,已成为后基因组时代的研究热点。本文采用检测基因组CpG位点甲基化水平的MSAP技术(Methylation-Sensitive Amplification Polymorphism),对海带配子体与孢子体世代进行研究,研究发现:孢子体世代甲基化水平(25.64%)显著高于配子体世代(♂5.50%和♀4.48%);低温处理能引起DNA甲基化位点及比率的变化,直接反映在配子体克隆同步发育率的显著提高;对于海带孢子体世代不同组织部位甲基化程度的检测表明,同一株海带不同组织部位的甲基化程度不同(21.79%~29.49%),其中以Ⅳ型为主,同一组织部位在不同个体中甲基化程度也存在差异。研究为进一步从表观遗传学角度探讨海带不同倍型的发育机制和配子体对低温的应答机制奠定基础。     

GRAPES-3Dvar雷达资料直接同化对江淮暴雨数值预报影响的分析研究

使用具备多普勒霄达资料直接同化功能的GRAPES-3Dvar同化系统,对2007年7月江淮流域连续性暴雨过程中4个个例进行了数值预报试验,结果表明多普勒径向速度以及基本反射率因子的直接同化可以有效改进中尺度降水数值预报的效果.对7月3 日雷达资料联合同化以及单独同化对分析和预报影响的进一步分析显示,联合同化能够有效改善初始分析场中的风场和湿度信息,激发模式降水,减小SPIN-UP现象,中尺度系统降水的发生发展以及强度、走势和落区的预报得到较为准确的表征,显著改善了中尺度强降水数值预报效果.径向速度的直接同化主要贡献表现在风场上,能够在初始场中增加气旋性涡旋等中小尺度风信息,改善三维风场分析.反射率直接同化的主要影响体现在湿度场上,改进了初始场中的湿度参数,对降水预报影响明显.     

Coseismic vertical deformation of the MS8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry

The devastating M_S8.0 Wenchuan earthquake ruptured two large parallel thrust faults along the middle segment of the Longmenshan thrust belt. Preseismic and postseismic leveling data indicated the hanging wall of the YingxiuBeichuan-Nanba thrust fault mainly presented coseismic uplift with respect to the reference point at Pingwu county town, and the observed maximum uplift of 4.7 m is located at Beichuan county (Qushan town) which is about 100 m west of the fault scarp. The foot wall of the Yingxiu-Beichuan-Nanba thrust fault mainly showed subsidence with maximum subsidence of 0.6 m near the rupture. By employing a listric dislocation model, we found that the fault geometry model of exponential dip angle δ= 88°?×1-exp(-9/h) with depth of 18 km and uniform thrust-slip of 5.6 m could fit the observed coseismic vertical deformation very well, which verifies the listric thrust model of the Longmenshan orogenic zone.