查询词典 extinction zone

To make a comprehensive view of metapopulation researches, we folly analyze and summarize the present concepts, theories and models of metapopulation in this paper, which primarily includes the dynamical models and simulation approaches of single and competitive metapopulations. Based on the Levin's patch occupant model, the center framework of metapopulation researches, primary principles and mechanisms are discussed. First, Levins rule: the fraction of empty patch will remain constant with habitat destruction as long as metapopulation survives. This rule implies that empty patches have determinant effects on persistence and conservation. Second. Allee effect of metapopulation is incurred by establishing difficulties and dispersal costs, which is important to the studies of reserve area and the minimum available metapopulation size. Third, we analyze the rescue effect that immigrants can reduce the extinction risk of the presented local population. Rescue effect can leads to the improvement of metapopulation sustainability and the decrease of fraction of empty patches. Fourth, the coexistence mechanism of two competing metapopulation is discussed, which suggests that competition-colonization trade off may be prevalent in competing systems. Finally, extinction debt ob tamed from coexistence mechanism is given, which depicts the lost of species richness in the future for the current habitat destruction. After theoretical discussion, we present two popular simulated approaches in metapopulations: probability transition model and stochastic process model.

为了能总观集合种群进展的全局并开展进一步的工作，首先对集合种群的已有概念、理论和模型做了全面的分析和总结；其次对集合种群的发展和概念进行了探讨，以集合种群模型的中心框架：Levins的斑块占据模型为基础，展开对其它原理、效应和机制的探讨；主要包括了Levins原理，即当生境进到破坏时，空斑块比例在集合种群灭绝前保持不变，然后还分析了Allee效应（集合种群的Allee效应主要是由于建群困难和扩散损失造成的）；第三，分析了援救效应：迁人个体可以降低斑块中现有局域种群的灭绝风险，援救效应会增强集合种群的生存力，使空斑块比例下降第四，探讨了两竞争集合种群的共存机制，即竞争－侵占妥协，其共存机制为空间生境中物种共存提供了有力的理论解释。

All methods of secondary arc extinction are directed toward reducing the magnitude of secondary arc current and recovery voltage, which in turn will reduce the extinction time of the arc and assure successful single-pole autoreclosure .

所有的用于熄灭潜供电弧的方法均可归结到降低潜供电流和恢复电压的幅值，进而减少电弧燃烧时间，保证单相自动重合闸的成功。

With the acceleration of extinction of species, biodiversity conservation is extensively concerned. The extinction of species is concerned with the degree of threat by biotic and abiotic factors.

一个物种的灭绝是与其受生物因子和非生物因子的威胁程度相关的。

For this reason, the "mathematical artefacts" of extinction estimates were not sufficient to be certain about the current state of extinction, said MacLeod.

&为此，灭绝估计的数学假象是不足以确定目前的物种灭绝形势的。&麦克劳德说。

Finally, the study primary indicate three ecological zone ,named urban core zone, urbanize zone, banlieue, and defined itself ecological relationship. Simultaneity, this syudy indicate cardinal urban space development problems about population, land, economic activities by the spatial structure analysis. And it directs this problems to offer countermeasure.

进而利用台中市相关数据初步地辨识出都市中心、都市化地区及市郊区等三个都市生态空间区域，指出其生态关系，并透过空间结构分析明确台中都市发展在人口、土地和经济活等三方面的主要问题，从环境保护的角度，对台中都市生态系统空间结构的问题提出改善建议，供台中都市空间规划参考。

When machinery and equipment (including the machinery and equipment used in contracted engineering projects), means of transport, office equipment and daily-use articles originally transported into the Zone from non-Zone areas are to be transported back to the non-Zones areas, the consignor shall file an application with the Customs with the certificates of the department in charge and the relevant documents originally used when transporting the goods into the Zone.

第二十四条由非保税区运入保税区使用的机器、设备（包括在保税区内承包工程施工使用的机器、设备）、交通工具、办公用品和日常生活用品，运回非保税区时，由发货人或其代理人持保税区主管部门的证明和原进入保税区时的有关单证向海关申请

Results: The average value of periodontal attachment level in the healthy adults was 5.03 mm in incisor zone, 2.93 mm in bicuspid zone, and 3.45 mm in molar zone.

结果 ：健康成年人牙周附着水平平均值前牙区为 5 。0 3mm、双尖牙区为 2 。93mm、磨牙区为 3.45mm。

Its brand should be set up on perfect ecological economy, scientific -tech renovation, production standard for blackland green-food raw-material base and quality criterion as well as service. It establishes the safe-code product system, the Rule of Cold Zone Black Glebe Trademark Management and the Measure of Cold Zone Black Glebe Trademark Management, etc, editing the Name List of Cold Zone Black Glebe Specialties in brief introduction, nutritious index and edible instruction in Chinese -English version. It controls production in all aspects of base, farmer and enterprise to ensure the quality of named brand products.

寒地黑土品牌产品的内在品质源于建立健全了以生态经济为统领、生产技术标准、产品标准和服务标准体系，建立并推行了产品可追溯的产品安全码制度，制定了《寒地黑土证明商标使用管理规则》和《寒地黑土证明商标使用管理办法》、《寒地黑土证明商标使用权申请程序》等一系列的标准和执行制度，并编制了中英文对照，集产品简介、营养指标、食用方法于一体的《寒地黑土产品名录》，对生产基地、农户和相关加工企业的生产标准、产品质量进行"硬约束"，从而确保了寒地黑土绿色物产的产品质量和使用寒地黑土品牌的产品质量。

The lower zone and the bronzite of the transition zone may be compared with the basal zone of the still-water complex.

下岩带和过渡带的古铜辉岩可与斯蒂尔沃特杂岩的基底岩带相比。

We think that feature of granitic geomorphologic landscape of Mt. Chaya, which had been formed by syenogranite with medium—coarse grains,mineral crystallized more coarse and equal,joint and fissure of productional are even spacing,unique geomorphologic place and the special climate condition is from north subtropical zone to warm temperate zone, are evidence that granitic geomorphologic is marked zone.

认为嵖岈山花岗岩地貌景观的特征是因嵖岈山花岗岩为中粗粒正长花岗岩，矿物颗粒结晶比较粗且岩性较均一、岩体内节理裂隙发育程度疏密适中、独特的地貌部位和北亚热带向暖温带过渡地带的气候条件形成的，是花岗岩地貌显著地带性有力见证。

Warden: That's a beautiful dog, but don't bring her again.

那是条漂亮的狗，但是不要再把她带来了。

You get up in the morning – no hangover!

你第二天早上起来的时候—不会宿醉！