查询词典 cluster sampling

In this review, historical background of sampling theory and development of forest inventories are presented. Application and research status of sampling methodology and technology in forest inventory in China and abroad are analyzed and reviewed, which includes sampling with probability proportional to frequency or to size, sampling based on remote sensing and sampling for rare population. Finally, both development trends and some problems of sampling methodology are discussed.

本文介绍了抽样理论的发展和国内外森林抽样调查发展过程，论述了森林调查中主要抽样方法的特点和研究现状，其中包括等概和不等概抽样、基于遥感的抽样、针对稀疏总体分布的抽样调查技术方法，并对这些抽样技术在国内外森林资源调查中的应用进行了综述，概括了抽样调查技术方法的发展趋势，最后总结了抽样技术方法还存在的一些问题。

At last,based on the traditional cluster-cluster aggregation model we introduce acritical cluster size and a breakup exponent that depends on the fragment sizes in thereversible and irreversible cluster-cluster aggregation processes.

在第六和第七章中，我们研究了临界集团的大小对可逆和不可逆集团聚集过程标度行为的影响。我们知道，在一般的CCA模型中，只要二个集团通过扩散碰到一起，它们便融合成一个更大的集团。

Under cluster innovation environment, SMEs could choose integration of industry, learning and research, technology introduction, cooperative research and development; Empirical studies show that the variable of cluster innovation environment and technical innovation competence in SMEs exits positive correlation; the management department of government and science and technology park should perfect cluster innovation environment,the SMEs should use cluster innovation environment more positively,perfect innovation resources sharing mechanism and cluster learning mechanism, perfecting intermediary service system,establish SMEs'technology innovation system.

政府及科技园区相关管理部门应该进一步完善集群创新环境建设，为群内中小企业营造良好的技术创新环境；中小企业应该更有效的积极利用集群创新环境，更多的通过合作创新实现技术创新能力的提升；健全创新资源共享机制与集群学习机制；健全中介服务体系，建立中小企业技术创新体系，提高中小企业自身技术创新能力。

In terms of memory hierarchy, we investigated how to improve the cache hit rate and localize data according to the characteristics of cache, master memory, local disk and remote disk in cluster systems. As for communication, features of cluster systems and different cluster internal networks are examined. Two popular parallel programming models - message passing model and share memory model - are analyzed in terms of how do they affect the cluster performance and how can we improve the cluster performance.

在处理器层面，分析了现代处理器中常用的一些技术，包括超线程技术、超长指令技术和NUMA架构等，对不同特点的程序的性能影响和如何充分利用处理器中的一些技术提升性能；在存储层次上，结合机群系统上Cache、主存、本地辅存及网络存储的存储层次的特点，分析了数据局部性、Cache命中率等对性能的影响以及提出如何提高数据局部性；通讯系统层面分析了不同机群通讯系统及不同机群通讯网络的特点；在编程模式方面，分析和比较了目前最常用两种并行编程模式--消息传递编程模式和共享存储编程模式，在机群系统上对性能的影响因子以及提出如何提高性能的方法。

This paper started with discussion of innovation source, and found the contribution of industrial cluster for technological innovation. In succession, I made a simple depiction of some interrelated theory about industrial cluster technological innovation. Then, I pay more attention about introducing how the industrial cluster played the role of Hatcher, how the relationship between industrial cluster and technological innovation. After studying this, I abstract the model of the enterprises technological innovation in the industrial cluster. I found there were three kinds of model: one is Inner studying model, one is Exterior studying model, and the other is"Indraught- Diffusion- Absorbability"model.

本文开篇以探讨创新源入手，引出了产业集群对技术创新的贡献，接下来在简要的介绍了产业集群的技术创新理论之后，又重点论述了产业集群如何发挥其孵化器的功能、产业集群与技术创新的关联性等方面的问题，引出产业集群中的企业的技术创新模式，主要从集群内部学习型模式、外部学习模式、以及&引进——扩散——吸收&型模式来研究产业集群的创新模式，这些模式各有其优点，并且适用于不同类型的集群企业。

Its very important to make an exact assessment of the competitiveness of automobile industrial cluster in Chongqing and find out the means to promote its competitiveness of automobile industrial cluster in Chongqing.In this paper, we make a theoretic summary from the points about the competitiveness of industrial cluster research history and actuality, associated theories, characters and the methods of assessments. Based on those analyses and the megascopic function from the rushing-character of industrial cluster and cluster governance, we set up an un-linear model.

本文在分析产业集群、产业集群竞争力的研究历史、现状、特点，产业集群竞争力的正面经济效应和对负面效应的经济规避能力，以及对国内外产业集群竞争力评价方法研究的基础上，基于产业集群的涌现性和集群治理对产业集群竞争力的放大作用，构建了一个评价产业集群竞争力的非线形模型。

Cluster sampling: When the Basic sampling unit in the population is to be found in groups or clusters the sampling is sometimes carried out by selecting a sample of clusters and observing all the members of each selected cluster.

整群抽样：一种抽样方法。当母体中的基本抽样单位是按群、组分类时，有时抽样方式是选择一类样本群组，然后对被选择的群组中的每一个样本单位的全体成员进行观察。

Based on the design of deepsea microplankton concentrated and gas-tight sampler, the following sampling techniques are lucubrated: pollution-free sampling technique, pressure-jump-free sampling technique and in-situ concentrated sampling technique; deepsea highprecision gas-tight sampling technique; sealing technique of superpressure seawater hydraulic system; reliability design technique of deepsea high pressure cabin.

论文以深海浮游微生物浓缩保压取样器设计为背景，对深海无污染无压力突变原位浓缩取样技术、深海高精度保压取样技术、超高压海水液压系统密封设计技术和深海高压密封舱可靠性设计技术进行了深入研究。

MEFP periodically selects cluster heads according to the node residual energy,incurs low message overhead,achieves fairly uniform cluster head distribution across the network,and the regular node joins the cluster which has the minimal energy-forward among cluster heads,this tactic can avoid forwarding sensing information circuitously.

提出了一种转发能量最小的无线传感拓扑算法MEFP（Minimal Energy-Forward Protocol），算法减少成簇的通信开销，在网络中簇半径区域内仅产生一个簇头，保证了分簇的均匀；在普通节点加入簇的过程中，选择转发功耗最小的簇头加入，避免迂回发送数据，降低了能量消耗。

From the point of the cluster of the small and medium-sized enterprises of Shaodong, this thesis studied the forming and development of the cluster, analyzed the existing problem and reasons of the cluster, compared and contrasted the "mode of shaodong " with " mode of Wenzhou ", and also analyzed the similarities and differences between these two modes, therefore summarized a few pieces of enlightenment for the development of the cluster .

本文从邵东的中小企业群集出发，研究了邵东中小企业集群的形成与发展情况，剖析了邵东中小企业集群发展存在的问题及原因，并与"温州模式"作了对比，分析了这两种"模式"的相似之处及不同之点，由此为邵东中小企业集群发展总结出了几点启示。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。