全站仪无棱镜测量边缘角点三维坐标的一种新方法

介绍在船舶分段测量中,无需安置棱镜而测量目标边缘角点或拐点的三维坐标的方法,通过精度分析和实例验证此方法的可行性.     

基于双树复小波的CBERS-02B星遥感影像融合及评价

以CBERS-02星全色、多光谱图像及IKONOS多光谱图像为数据源,利用离散小波变换和双树复小波变换进行融合试验。结果表明,双树复小波变换在空间细节表现力和光谱保持方面能够较好地达到平衡,较离散小波变换更能提高图像融合质量。通过融合方法对比分析可知,02B星全色波段不仅与其多光谱波段融合能够得到信息更加丰富的图像,而且与其它传感器数据融合同样有很好的目视效果和可读性,具有较大的应用前景。     

GPS虚拟参考站原理及实测精度验证分析

首先介绍GPS RTK技术的局限性,然后分析基于GPS连续运行参考站网络虚拟参考站的基本原理、数学模型,根据综合误差线性内插原理计算虚拟参考站的综合原始观测数据,求出流动站的定位结果;然后就某市建立的虚拟参考站网络的实测数据进行动态、静态精度分析;最后得出结论：虚拟参考站技术扩大GPSRTK的使用范围,提高动态测量的精度,其开放式的数据服务使VRS技术成为Net Work RTK的主要发展方向之一。     

Evaluation of Inference Adequacy in Cumulative Logistic Regression Models: An Empirical Validation of ISWRidge Relationships

Internal solitary wave propagation over a submarine ridge results in energy dissipation, in which the hydrodynamic interaction between a wave and ridge affects marine environment. This study analyzes the effects of ridge height and potential energy during wave-ridge interaction with a binary and cumulative logistic regression model. In testing the Global Null Hypothesis, all values are p 〈0.001, with three statistical methods, such as Likelihood Ratio, Score, and Wald. While comparing with two kinds of models, tests values obtained by cumulative logistic regression models are better than those by binary logistic regression models. Although this study employed cumulative logistic regression model, three probability functions p^1, p^2 and p^3, are utilized for investigating the weighted influence of factors on wave reflection. Deviance and Pearson tests are applied to cheek the goodness-of-fit of the proposed model. The analytical results demonstrated that both ridge height （X1 ） and potential energy （X2 ） significantly impact （p 〈 0. 0001 ） the amplitude-based refleeted rate; the P-values for the deviance and Pearson are all 〉 0.05 （0.2839, 0.3438, respectively）. That is, the goodness-of-fit between ridge height （ X1 ） and potential energy （X2） can further predict parameters under the scenario of the best parsimonious model. Investigation of 6 predictive powers （ R2, Max-rescaled R^2, Sorners＇ D, Gamma, Tau-a, and c, respectively） indicate that these predictive estimates of the proposed model have better predictive ability than ridge height alone, and are very similar to the interaction of ridge height and potential energy. It can be concluded that the goodness-of-fit and prediction ability of the cumulative logistic regression model are better than that of the binary logistic regression model.     

Evaluation of Inference Adequacy in Cumulative Logistic Regression Models： An Empirical Validation of ISW-Ridge Relationships

Internal solitary wave propagation over a submarine ridge results in energy dissipation, in which the hydrodynamic interaction between a wave and ridge affects marine environment. This study analyzes the effects of ridge height and potential energy during wave-ridge interaction with a binary and cumulative logistic regression model. In testing the Global Null Hypothesis, all values are p<0.001, with three statistical methods, such as Likelihood Ratio, Score, and Wald. While comparing with two kinds of models, tests values obtained by cumulative logistic regression models are better than those by binary logistic regression models. Although this study employed cumulative logistic regression model, three probability functions p^1, p^2 and p^3, are utilized for investigating the weighted influence of factors on wave reflection. Deviance and Pearson tests are applied to check the goodness-of-fit of the proposed model. The analytical results demonstrated that both ridge height (X1) and potential energy (X2) significantly impact (p<0.0001) the amplitude-based reflected rate; the P-values for the deviance and Pearson are all >0.05 (0.2839, 0.3438, respectively). That is, the goodness-of-fit between ridge height (X1) and potential energy (X2) can further predict parameters under the scenario of the best parsimonious model.Investigation of 6 predictive powers (R2, Max-rescaled R2, Somers'D, Gamma, Tau-a, and c, respectively) indicate that these predictive estimates of the proposed model have better predictive ability than ridge height alone, and are very similar to the interaction of ridge height and potential energy. It can be concluded that the goodness-of-fit and prediction ability of the cumulative logistic regression model are better than that of the binary logistic regression model.     

应用测量技术解决城市地铁与地下管线影响问题的研究

城市地铁和地下管线是城市设施的两个重要内容,二者同处地下空间,相互影响,测量是解决二者空间冲突和安全建设、运营的重要技术手段。通过分析城市地铁与地下管线在设计、施工及运营阶段的影响关系,提出了解决问题的措施,介绍了解决措施中的关键技术问题,为地铁建设、运营对地下管线的影响等有关问题提供了解决思路。     

中长基线周跳实时探测和修复的新方法

提出了一种适合网络RTK基准站间周跳实时探测和修复的新方法.该方法根据基准站坐标已知的特点,反求模糊度的浮点解来探测周跳并确定周跳的范围,最后结合电离层残差组合来修复周跳.该方法可以应用到当基准站没有精确已知的坐标时的静态实时周跳探测和修复中,通过理论分析和实际计算表明,该方法处理周跳的能力较强,具有实时探测和修复中长基线的失锁时间较长的周跳,且计算简单的特点.     

5种中草药对美国红鱼生长和免疫机能的影响

用分别含连翘(Forsythia suspensa)、猪苓(Polyporus umbellatus)、黄芩(Radix scutellariae)、茯苓(Poria cocos)和黄连(Coptis chinensis)水提取物的配合饵料饲喂美国红鱼(Sciaenops ocellatus),研究其对美国红鱼(Sciaenops ocellatus)生长和免疫机能的影响.结果表明,投喂含有黄芩和茯苓的药饵可使美国红鱼的体长增长率和相对增质量率显著高于对照组(P<0.05);投喂5种含中草药的药饵后,美国红鱼血液白细胞的吞噬活性有明显提高,投药后3 d,除茯苓组外,其余各组吞噬百分比(PP)与对照组之间均差异极显著(P<0.01);在投药后3 d或投药后7 d,连翘、黄芩和黄连组的吞噬指数(PI)与对照组相比有显著(P<0.05)或极显著(P<0.01)差异.在停投药饵后7 d,除茯苓组外,其余各组PP、PI与对照组相比仍有显著差异(P<0.05).同时,美国红鱼血清溶菌酶活性也有显著提高,投药后7 d,溶菌酶活性与对照组之间差异极显著(P<0.01),但在停投药饵后7 d,溶菌酶活性与对照组之间无显著差异(P>0.05);投药28 d后,利用哈维氏弧菌(Vibrio harveyi)人工感染美国红鱼,黄芩组的相对免疫保护率最高,达88.9%,连翘组次之,茯苓组最低.     

象山港氮、磷营养盐环流和分布规律的研究

采用定点监测分析方法,研究了象山港狭湾内设置的六个固定站位1992-2007年时间段内的硝酸氮(NO3-N)、亚硝酸氮(NO2-N)、铵氮(NH4-N)和磷酸盐(PO4-P)浓度的监测数据,探讨了象山港狭湾内(122°00'E以西)氮、磷营养盐的环流和分布规律.结果表明,(1)除个别年份外,16年内硝酸氮、亚硝酸氮、铵氮和磷酸盐浓度的空间分布,从港顶1号站向港口6号站呈降低趋势,其中以PO4-P、NO2-N的降低趋势最为明显,而NH4-N的降低趋势相对较弱.(2)NO3-N的空间变化规律较为复杂,并且3号站的浓度往往达到最大值.(3)无论是平水期(4月)还是丰水期(7月),表层盐度均低于底层,而表层温度高于底层;盐度从港顶1号站向港口6号站递增,而温度递减.这种分布规律基本上可用余环流模式进行解释,但余环流输运并不是促使营养盐入海的唯一原因,潮振荡的垂向剪切造成的纵向弥散和潮混合亦对营养盐输运有重大贡献.(4)与1992年相比,2007年各站的NO3-N浓度几乎都增加了一倍,PO4-P浓度增幅更大,说明象山港的氮、磷污染与日俱增.     

应用于村镇信息自助平台的电子地图构件关键技术研究

从构件化村镇信息自助平台的低成本、易定制的特点出发,针对其中电子地图构件在地图浏览和交互查询中存在的网络负载大、响应速度慢等技术问题,研究了传统We-bGIS空间数据网络发布模式及其不足,探讨了基于AJAX、地图切片、多级缓存技术的电子地图发布解决方案,并实现了在村镇信息自助平台上的应用.