基于最小二乘支持向量机的声速空间变化模型构建

建立声速空间变化模型是解决声速剖面代表性误差的有效方法。在对不同声速剖面进行标准化处理的基础上,通过声速训练样本及核函数的选取,提出并实现了一种基于最小二乘支持向量机算法的声速空间变化模型构建方法。为了检验该方法的有效性,选取实测的声速剖面数据进行验证,结果表明该方法能有效地构建声速空间变化模型,从而消除或最大限度地削弱声速剖面代表性误差。     

基于地面激光扫描技术的矿区地形图更新

设计了一种基于地面激光扫描系统的矿区地形图更新方法,并探讨了其方法重建矿区三维模型的方法。通过试验表明,矿区地形图测绘效率得到了有效提升,重建的三维模型可用来监测矿区开采量。     

1∶50000地形图制图数据质量控制及常见问题分析

1∶50000地形图制图数据生产是国家1∶50000数据库更新工程的一项重要内容,其成果质量关系到国计民生。在详细分析其成果特点的基础上,给出了成果质量控制的内容和方法,并对其数据中存在的常见问题进行了总结和分类,提出了具体的解决方案和建议。     

Pararhabdodon isonensis and Tsintaosaurus spinorhinus: a new clade of lambeosaurine hadrosaurids from Eurasia

We present new anatomical information showing that Koutalisaurus kohlerorum, from the Maastrichtian of Lleida Province, northeastern Spain, is most probably the junior synonym of Pararhabdodon isonensis from the same region. Dentary and maxillary characters previously considered as autapomorphies of K. kohlerorum and P. isonensis, respectively, are shown to be synapomorphies uniting the latter with Tsintaosaurus spinorhinus from the Campanian of the Wangshi Group, Shandong Province, China.This study provided conclusive evidence of the presence of the Lambeosaurinae in Europe. Tsintaosaurus spinorhinus and Pararhabdodon isonensis were inferred to form a clade of basal lambeosaurines characterized by a maxilla with an elevated articular facet for the jugal (continuous with the ectopterygoid ridge) and an extremely medially projected symphyseal region of the dentary. This clade originated in Asia during the middle or late Campanian. Pararhabdodon isonensis or its ancestors migrated from Asia to the Iberian island of the European archipelago. Reconstruction of ancestral areas by Fitch parsimony attributes the European occurrence of P. isonensis to a single dispersal event from Asia no later than middle to late Campanian.     

EH4 电磁测深在江西城门山矿区深部及 外围找矿中的应用

城门山铜矿床位处九瑞铜多金属矿集区南东端,是典型的层控块状硫化物型铜矿床.利用EH4电磁测深清晰的反映地层和低阻体的展布状态,在城门山矿区取得了明显效果,并将这一成果运用到城门山矿区的深部和外围,发现了与成矿相关的电性异常,达到了评价勘探区成矿潜力的目的,也证明了EH4电磁测深对层控硫化物铜矿床是一套高效实用的勘探手段.     

Comparative transcriptomic analysis of Macrobrachium nippon ense in response to Aeromonas veronii or Staphylococcus aureus infection

M acrobrachium nipponense is an economically important freshwater prawn that is often threatened by many aquatic pathogens. In this study, comparative transcrip...     

桂北河池-宜州断裂带构造特征及其演化:柳城段浅部到深部结构的启示

河池-宜州断裂带是一条东西向构造带,位于扬子地块东南缘雪峰山构造带南部,与扬子地块主体NE向的构造格局明显不同,其成因始终不明确。本文通过遥感构造解译、野外地质观察、构造剖面绘制、地震和MT剖面解释等手段,对河池-宜州断裂带东段进行了空间上由浅入深的系统研究,研究表明断裂带总体表现为向北逆冲的叠瓦构造分割了雪峰山南段构造体系和桂中坳陷构造体系;河池-宜州断裂带经历了多期次活动历史,其中现今构造格局主体由印支期和燕山期复合动力学机制下形成的,西段主要由印支期向南的弧形逆冲推覆阶段形成,东段主要由燕山期向西的弧形叠瓦式逆冲推覆奠定,它们的弧顶正好在宜州附近交接。     

元谋尹地金矿化区控矿条件及找矿前景

从地球化学特征分析中提取出矿化区控矿因素,矿化存在于海资哨岩组千枚岩、石英岩、石英片岩中,受地层岩性、韧性剪切破碎带的控制。圈出Ⅰ级靶区1处、Ⅱ级靶区2处。     

Effects of the Herbicide Diuron on Cordgrass (<Emphasis Type="Italic">Spartina foliosa</Emphasis>) Reflectance and Photosynthetic Parameters

Early indicators of salt marsh plant stress are needed to detect stress before it is manifested as changes in biomass and coverage. We explored a variety of leaf-level spectral reflectance and fluorescence variables as indicators of stress in response to the herbicide diuron. Diuron, a Photosystem II inhibitor, is heavily used in areas adjacent to estuaries, but its ecological effects are just beginning to be recognized. In a greenhouse experiment, we exposed Spartina foliosa, the native cordgrass in California salt marshes, to two levels of diuron. After plant exposure to diuron for 28 days, all spectral reflectance indices and virtually all fluorescence parameters indicated reduced pigment and photosynthetic function, verified as reduced CO₂ assimilation. Diuron exposure was not evident, however, in plant morphometry, indicating that reflectance and fluorescence were effective indicators of sub-lethal diuron exposure. Several indices (spectral reflectance index ARI and fluorescence parameters EQY, Fo, and maximum rETR) were sensitive to diuron concentration. In field trials, most of the indices as well as biomass, % cover, and canopy height varied predictably and significantly across a pesticide gradient. In the field, ARI and Fo regressed most significantly and strongly with pesticide levels. The responses of ARI and Fo in both the laboratory and the field make these indices promising as sensitive, rapid, non-destructive indicators of responses of S. foliosa to herbicides in the field. These techniques are employed in remote sensing and could potentially provide a link between landscapes of stressed vegetation and the causative stressor(s), which is crucial for effective regulation of pollution.