查询词典 characteristic index

From the point of view of geobotany, with the method of correlative factors of growth of plants, a countrywide theoretic ecological division was done for the introduction of Camptotheca acuminata and three kinds of areas of ecological preferent zone, ecological adaptive zone and ecological unadaptable zone were divided. With the theory of synecology, the characteristic on environment, constitution, life form spectrum, diversity, similarity of plots of communities were researched. Applying the method of species association, discrete distribution, indensity index, fractal geometry, etc. to research relations between the species of the communities, space distribution of Camptotheca acuminata, structure of age of Camptotheca acuminata, in different communities. Using the theories of autoecology, distibutons of seeds on land and growth of seedlings in vertical and horizontal directions, biomass of organ of Camptotheca acuminata were analyzed. On the opinions of conservation biology, the external and internal factors impressing Camptotheca acuminata were analyzed to research the mechanism of the endangered species, and with using of CTM Model, the future development direction of Camptotheca acuminata in different communities were forecasted, and. Standing on the position of resources ecology, discussing the regularity of camptothein in Camptotheca acuminata of different sites and seeding of different resources, also the the derive technics of camptothecin.

本文从地植物学的角度，运用植物生长相关因子法，对我国喜树资源的生态适宜区进行了划分，理论上确定了我国的喜树的引种栽培的最适生活区域、生态适宜区域和不适宜生活区域；从群落生态学的角度，对野生喜树所在的典型群落的群落环境、群落组成、群落生活型谱、群落的物种多样性特点、群落样地间相似性进行了研究；从种群生态学的角度，运用种间联结性、离散分布模型、聚集强度指数、分析几何等分析手段，对野生喜树所在典型群落间的种间关系、喜树的空间分布格局、年龄结构等进行了分析；从个体生态学的角度，对不同年龄组的喜树的种子的散落的垂直分布、水平分布、时间分布及种子发芽率和千里重等特点、不同种源的人工喜树苗期特点、喜树的高生长和茎生长特点、喜树的器官生物量特点进行了研究；从保护生物学的角度，对野生喜树的濒危的内部因素和外部因素进行了探讨，并运用CTM模型对不同群落中野生喜树的种群趋势进行了预测；从资源生态学的角度，对我国地理环境下喜树中喜树碱含量的地理分布规律、不同种源的喜树幼苗中喜树碱含量变化规律进行了研究，并对喜树碱的提取工艺进行了探讨。

An index system was set up in this paper,including six eco-hydrological characteristic indexes,that is,long-term variables,high-flow variables,low-flow variables,moving-average variables,variables related to the rise and fall of the hydrograph and mo...

借鉴国外已有的研究成果，建立了一套指标体系包括长期指标、高流量指标、低流量指标、平均变化指标、涨水落水指标和月流量指标，通过分析指标的变化来评价水利水电工程对生态环境的影响。

In addition, by using bondtype and polyhedron cluster type index methods to analyze the transformation of the microstructure, not only the key role of icosahedron in amorphous formation and stability can be explained, but also the solidification processes and the configuration characteristic of amorphous metals understood deeply.

此外采用键对及原子多面体类型指数法对凝固过程中微观结构组态变化的分析，不但能说明二十面体结构在非晶态合金形成和稳定性中所起的关键作用，又有助于对液态金属的凝固过程、非晶态结构特征的深入理解。

In allusion to the characteristic of dynamic Ad Hoc network,this paper puts forward a new estimate index of network invulnerability and sets up a incidence matrix to depict the connectivity of the network nodes in a dynamic network model .

针对动态Ad Hoc网络的特性，提出了抗毁率这一新的网络抗毁性评价指标，在动态网络模型中建立了刻画网络节点连通性状的关联矩阵。

Fingerprint characteristic data about 300 bytes will be encrypted and digitized to store on a magnetic strip or in index position of an IC chip of the bank card.

指纹特征约300字节的数据将被加密和数字化存储在磁条或指数位置的IC芯片的银行卡。

Fingerprint characteristic data about 300 bytes will be encrypted and digitized to store on a magnetic strip or in the index position of an IC chip of the credit card.

指纹特征约300字节的数据将被加密和数字化存储在磁条或在索引中的位置的IC芯片信用卡。

When analyses characteristic and function of the Text Search of Mongolic Word, this paper emphatically introduces the design of MWTSS（Mongolic Word Text Search System）system, introduces the whole structure of MWTSS, analyses text database of MWTSS, then introduces the structure of the building index search sub-systems and the keyword search sub-systems.

本文首先分析了该课题的背景知识和国内外研究现状，在分析蒙文单词全文检索系统MWTSS（Mongolic Word Text Search System）系统的特点和功能之后，重点给出了MWTSS的系统设计，介绍了MWTSS的整体结构，分析了MWTSS全文数据库，建立索引子系统和关键词检索子系统的基本结构。

Secondly, According to the sub-pixel structure characteristic, the potential of deriving vegetation fraction from normalized difference vegetation index using the TM data and resorting to "Dense Vegetation Model" and "Nondense Vegetation Model", is studied in an area in the south of Yichang.

本文首先对TM影像进行了几何纠正、辐射校正、大气校正；然后根据混合像元的结构特征，利用TM数据从植被指数中采用"等密度模型"和"非密度模型"提取了宜昌南部地区的植被覆盖度。

The problem of PI controller design for the multi-input and multi-output system is transformed to that of static output feedback controller design via the new state variable. As to the problem of the static output feedback, a new LMI-based sufficient condition of the controller is presented in this thesis. We can gain the multivariable PI controllers just solving one LMI inequality. The numerical example is provided to illustrate the proposed design approach. 3.The H_∞ robust control is able to solve the multivariable problem, also the control problem characteristic of the modeling error, parameters uncertainties and unknown perturbation, Its application research in the power electronics is beginning now. Considering the characteristics of the PWM DC-DC converters, a multivariable PI controllers which is based on H_∞ Performance Index is designed.

通过构造新的状态变量，可以将多输入多输出系统的PI控制器设计问题转化为静态输出反馈控制问题，利用后者的成熟理论来设计控制器；本文在问题转化后采用更为简便的算法，只需通过求解一个LMI不等式，就能求取基于H_∞性能指标的多变量PI控制器参数，实例验证了算法的有效性。3.H_∞鲁棒控制具有处理多变量问题的能力，可解决具有建模误差、参数不确定和干扰未知系统的控制问题；它在电力电子学中的应用研究刚刚开始。

Based on the "shortest path matrix", the selected characteristic indices-distance, time and speed, this paper analyses the current spatial structure of accessibility in the cities which the national trunk highway system connects, and impacts the speed index made.

以"最短路径模型"为基础，选取距离与时间两个特征指标以及联结两者的速度指标，分析了目前中国国家干线公路网络联结的城市通达性空间格局。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。