查询词典 as follows

So, the study in this dissertation focuses on some key points in theuncertainty treatment of mobile robot localization as follows: Combined with the multiple proprioceptive and exteroceptive sensors ofmobile robot MORCS-1, aimed at the drift error of fiber optic gyro as theproprioceptive sensor, the neural network using genetic algorithm as optimaltool is proposed to accomplish the modeling and calibration for temperaturedrift of fiber optic gyro, which can reduce the drift error to the standard outputat constant temperature; and aimed at the noisy disturbance of ranging datafrom the exteroceptive sensor laser scanner, a dynamic adaptive filter isintroduced through the analysis of neighboring ranging data in time and spatialcorrelation to realize the real-time and dynamic filter, which can validly filter the noisy disturbance to meet the requirement of the accurately real-timeobstacle detection in mobile robot navigation.

总结全文，在移动机器人定位的不确定性处理研究中，提出了一些具有一定创新性的方法：结合自行研制的移动机器人MORCS-1系统的多种内外部定位传感器，针对内部本体感受传感器光纤陀螺仪的漂移误差，提出采用基于遗传算法优化的神经网络来对光纤陀螺仪的温漂建模及校准，能够将其温漂变化控制在恒温条件下标准测试输出附近；针对外部环境感知传感器激光雷达测距数据中包含的噪声干扰，考虑移动机器人导航中激光雷达测距数据的时空关联性，提出采用动态自适应滤波技术进行预处理，从而可以有效滤除噪声干扰满足导航中障碍实时精确检测的要求。

Moreover, its application as microwaveabsorber was primarily studied which lays a solid foundation for further investigations.The content, results and originalities of this research are as follows:1.3D self-assembled flowerlike hierarchical spheres of MnO_2 andγ-MnOOH nanobelts were prepared by a simple hydrothermal method, using KMnO_4 and H_2O as reactants, without any templates and surfactants.

本论文以倡导绿色环保为时代背景、以纳米科技的飞速发展为科学背景、以锰氧化物在二次电池和微波吸收领域的应用为着眼点，着重研究了各种不同形貌锰氧化物低维纳米材料的制备、生长机制及形貌控制，并初步研究了锰氧化物纳米材料的微波吸收特性，为进一步深入研究奠定基础。

The kinetic behaviors of ethylene homo- olymerization and ethylene / l-hexene co-polymerization , catalyzed by the metallocene catalyst PS-DVB-MC in an 0.5 L stainless steel reactor , were studied. The effects of polymerization conditions on ethylene polymerization , such as concentration of catalyst , temperature of polymerization , pressure of ethylene , molar ratio of AI / Z r , etc ., were also investigated . Some leading results were as follows : the activity of the catalyst PS–DVB- MC for ethylene homo-polymerization was high ( 1.053 x 107 gPE / mol Zr·h ), but the molar ratio of AI / Zr was low ( 350:1 ); the catalytic ability for ethyleneα-olefin ( such as l hexene etc .) co-olymerization was great , and the corresponding activity come up to a maximum of 1.753 x 107 gPE / mol Zr·h while concenlration of l-hexene was 0.080 mol / L ; the molecular weight of polyethylene was about 180,000 , meanwhile the molecular weight distribution was narrow ( 2.19 ); the bulk density of polyethylene and ethylene / l-hexene co -polymer were 0.25 and 0.34 respectively .

采用0.5L高压不锈钢反应釜，对催化剂PS–DVB-MC催化乙烯均聚和乙烯/ l-己烯共聚合的动力学行为进行了研究，详细考察了催化剂浓度、反应温度、压力、Al/ Zr比、1-己烯浓度等因素对乙烯聚合反应的影响，得到如下主要结论：催化剂PS-DVB-MC具有催化乙烯均聚的高活性(1.053×107g PE / mo1 zr.hr)，低Al / Zr比( 350：1 )；具有良好的催化乙烯与α-烯烃(如1-己烯等)共聚的能力，在1-己烯浓度为0.080 mol / L时，催化活性达到最大(1.783×107 g PE / molZr.hr)；乙烯均聚产物的分子量在18万左右，分子量分布窄( 2.19 )。

Daxing as the case study has been studied in this dissertation, with the help of geostatistics and GIS, on the basis of data of the second general soil quality investigation in 1982 and the corresponding data of indoors soil analyzed, the spatio-temporal law of organic total-N, hydrolyzable nitrogen, available-P and available-K below the surface of soil (0-20cm) within 20 years in Daxing has been studied, as the same time, the change of soil quality has been evaluation applying to the method of soil quality compressive index, the main results are as follows

本文以北京市大兴区为研究样区，以相同样点的1982年第二次土壤普查土壤肥力数据和2000年的新采土样分析数据为基础，运用GIS与地统计学结合的方法，研究了20年来北京市大兴区300多点位的表层土壤的(0-20cm)有机质、全氮、碱解氮、速效磷、速效钾等肥力要素的时空变化规律，应用土壤质量综合指数法定量评价了表层土壤质量的变化，研究主要结论如下

Flooding,as a kind of disturbance events,occurred with higher and higherfrequency over the world.To investigate the effects of flooding disturbance ongrassland vegetation and the soil,a comparatively thorough study was conducted onAneurolepidium chinense grassland in Songnen plain,Northeast China.The studysite was located in Sanjiadian National Rangeland in the territory of Da'an city,Jilirprovince,which was partly flooded in 1998.On the study site,Several transectssubjected to different flooding durations and intensities were designed for thecomparative study among them on such aspects as vegetation characteristics,seedbanks,vegetative propagation of rhizomatous plants,distribution patterns ofpopulations,interspecific relations,and physio-chemical properties of soil.Theresults were as follows:(1)Of the functional group composition of the vegetation,with the elongation of the flooding duration or the increase of flooding severity,theratio of hygric and hygro-mesic plants increase,while that of mesic and mesoxericplants decrease,of Therophytes changed unimodally,of Geophytes increased,whileof Hemicryptophytes decreased.

为弄清草地植被及其土壤环境对水淹干扰的响应，在松嫩平原羊草草地1998年部分遭受水淹的吉林省大安市三家甸子草场内设置了经历不同水淹干扰持续时间和不同水淹强度的样带，并在这些样带之间从植被特征、种子库特征、根茎植物的营养繁殖性能、种群分布格局、种间关系及土壤的理化性质等多个方面展开对比研究，主要结果如下：(1)在植被的功能群组成中，随干扰强度的增加和水淹干扰持续时间的延长，湿生、湿中生类植物功能群的优势度比例基本上是逐渐增加的，中生、中旱生类植物功能群的优势度比例则逐渐减小，而一年生植物的优势度比例呈单峰型变化，地下芽植物比例增加，地面芽植物比例减小。

Applying Institutional Economics theory, using experience of overseas forestry institutions arrangement as reference, after analyses of the current problems and institution inequilibrium in state-owned forest area, this dissertation draws the conclusions as follows:(1)The forest areas institutions is a function taking environment and forest resource as its independent variables.

这里的管理制度只界定在国有林区的治理组织的设定这一层面，想通过一种组织的设定重新构架国有林区的政府、市场、企业、社会之间的关系，将林区的各种资源导入到一个适应社会主义市场经济，适用于林区资源状况的社会经济运行框架。

The main reasons caused theses problems are as follows: beyond marine carrying capacity and environment capability by predatory and extensive manners, over-exploitation of bioresources resulted in the disturbance of marine ecosystem and the obstruction of matter and energy circulation. Marine environment pollution and unreasonable oceanographic engineering caused serious damage of marine entironments, weakness of marine eco-functions, and degradation of marine ecosystems. The population explosion as well as the trend of population towards coast inflicted tremendous pressure on marine resources and environment. The weakness of marine laws system and the infirmness of macroscopical control by government policies relulted in unreasonable utilization, inefficient management, and insufficient protection of marine bioresources.

其主要原因是：对海洋生物资源的掠夺性、粗放性开发，造成资源过度利用，超出海洋承载力及其环境容量，物质能量循环出现障碍，海洋生态系统失衡；海洋环境污染和不合理的海洋开发工程，造成生境破坏，生态功能减弱，生态系统退化；人口增长和趋海发展，给沿海资源环境造成巨大压力；涉海法律法规体系薄弱，国家宏观政策调控不力，未能合理利用和有效管理、保护海洋生物资源和海洋环境。

The results are as follows: Sonneratia apetala gained the risk values of 42(41), and Laguncularia racemosa as 40(36.5), they all been ranked as "Represents certain risk, gaining relevant information for further research or taking some measures for prevention and supervision is needed".

结论为：无瓣海桑风险分值42(41)，拉贡木风险分值40(36.5)，风险等级为&具有一定的风险，需要获取相关信息进一步加以研究或应采取相应的防范监控措施&。

The main contents are as follows:(1) Based on Fresnel transformation and its fast algorithm by FFT, the principle of numerical reconstruction of digital lensless Fourier transform hologram and the spatial resolution, as well as the lateral resolution of the reconstructed images plane are elaborated.

其主要内容包括：(1)从处理衍射问题的菲涅耳变换法出发，根据菲涅耳衍射积分的快速数值解法，讨论了数字无透镜傅里叶变换全息图数值再现的相关过程和理论，以及再现像平面的空间分辨率和横向分辨率问题。

In order to make Maca be introduced to China, the basicproblems related to introduction and planting such as morphology classification, regionlayout, tissue culture and allelopathy were carried out. And the results were as follows:(1) The numerical Taxonomy of Maca and fifteen plants of Lepidium in China wasinvestigated by cluster analysis and the results showed that the method of numericaltaxonomy could be applied for Lepidium and its results were basically consistent with thatof morphology taxonomy and molecular marker such as Pi intron, ITS and cpDNA.

本文围绕玛咖在中国引种栽培的基础性和关键性问题，进行了形态学分类、区域规划、组织快繁以及克生现象等的研究，取得以下成果：(1)采用聚类分析，对 15 种中国独行菜属植物以及玛咖进行数量学分类，结论与经典形态学分类以及用 Pi 内含子序列、ITS 序列和 cpDNA 序列进行分类的结果基本吻合，玛咖与家独行菜、碱独行菜的亲缘关系最近，相似系数分别为 0.839、0.722。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。