查询词典 breadth

Niche breadths of twenty dominant species were analyzed using Shannon-Wiener niche breadth index, and the dominant species were classified into four ecological groups.

采用Shannon-Wiener生态位宽度指数和Petraitis生态位重叠指数测定了滹沱河流域湿地植被20个优势种群的生态位宽度和生态位重叠。

When we determine strip-base breadth on the basis of design codes, the realistic base area of the strip-base is less than the calculated base area resulting in insufficient bear-load capability of ground, because the base breadths don't contain overlapping part of strip- bases.

按规范方法确定的条形基础宽度，由于未考虑纵横墙条形基础的重叠部分，所构成的基底实际面积比计算所需的基底面积减少，相应地造成其地基承载力的不足。

He did not err by a hair's breadth in his calculation.

他的计算结果一丝不差。

He did not err by a hair's breadth in his calculation .

他的计算结果一丝不差。不适合

She won by a hair's breadth.

她以微弱的优势获胜。

Using ultrasonic to measure the thickness of the cholecyst cliff in these patients. At the same time, we measure their breadth of the portal vein and the level of the ascites, and examine the level of ALB、TBil、AST、ALT in blood serum.

采用超声观察178例肝硬化患者的胆囊壁厚度和腹水检查、门静脉宽度、血清白蛋白水平、总胆红素水平以及门冬氨酸氨基转移酶、丙氨酸氨基转移酶水平。

The crown is about 1-2.5m tall and the breadth of the crown is about 1-1.5m. It adapt to grow on high density. 2. The idioplasmic resources of Lonicera fragrantissima are abundant, It can be classified 8 types by the differences of the shape of fruits: cherry shape, drop shape, dumbbell shape, ellipse herringbone shape, inverse egg herringbone shape, chook foot shape, square round herringbone shape, taper herringbone shape; be classified 3 types by the color of fruits: simple red fruit, red fruit and mauve fruit; be classified 4 types by the shape of leaf: roundness, ellipse, egg round, ellipse wrap around leaf.

以果形差异可分为樱桃果型、偏坠状果型、哑铃状果型、椭圆人字状果型、倒卵人字果型、鸡爪状果型和矩圆人字果型、嘲锥人字果型等8个类型；以果色可分为浅红色果类、红色果类和紫红色果类3个类型，以叶形可分为圆形叶类、椭圆形叶类、卵圆形叶类、椭圆披叶形叶类等4个类型，以冠形可分为高于疏枝冠形类、下垂密枝低冠形类和中高干密枝冠形类等3个类型，根据各类型特点选择鲜果食用类、饮料栽培类、露地观赏类、插花观赏类、盆景观赏类和药用栽培类等一批优树。

The breadth of China's role could depend on its ability to keep its own economy chugging along.

中国影响力的深广度取决于保持本身经济良好发展的能力。

1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.

通过上述几个方面的研究，主要得出以下15条结论：(1)生态位构建可使空间结构种群，甚至是在没有杂合子优势的条件下，形成多种可能的稳定基因型分布模式；(2)随着环境的破坏与恶化，种群的生态位构建作用加速其较早形成稳定多态以阻碍环境对种群的不利影响，解释了有机体在不利环境下的一种生活史对策；(3)生态位构建作用通过基因型—环境反馈机制及有限的基因交流导致基因型多态的稳定共存；(4)有机体的生态位构建作用是一种积极的动力改变环境进而改变其自然选择的方向；(5)生态位构建的时滞作用对集合种群动态和空间分布产生深刻影响；(6)集合种群大小在时滞的崭新效应和等权重效应下达到一固定值，而在首位效应下达到统计稳定，表明首位效应的影响最显著；(7)首位效应下生态位构建相对权重的增量和时滞的长度是影响系统不稳定性动态的关键因素；(8)适中的生态位构建强度有利于集合种群的续存；(9)生态位宽度变窄会减少集合种群的数量从而增加其灭绝风险；(10)时滞和生态位构建的双重作用使系统产生周期振荡，并在异质性环境中产生稳定的螺旋波，破碎的螺旋波和环形波三种分布模式；(11)集合种群与资源含量的空间分布因为相滞而互补；(12)具有生态位构建的集合种群续存不仅取决于侵占率与灭绝率之间的平衡，而且依赖于生态位构建能力同其生境的自然消耗速率之间的妥协；(13)当生境中适合侵占的斑块比例小于其侵占率与灭绝率之比时，生态位构建作用促使集合种群在一定条件下续存：(14)生境斑块的状态从不适合到适合转变过程中存在生态位构建强度和系统初始条件这两个阈值；(15)集合种群的大小同正生态位构建能力正相关，意味着对环境具有较强正作用的有机体对维持有效生境起积极作用。

Using the Pearson correlation coefficient and Spearman rank correlation coefficient, the interspecific association of 13 species in different communities in Beijing mountainous area were investigated, and the niche breadth and niche overlap of 13 species were studied.

应用Pearson相关系数和Spearman秩相关系数检验，研究了北京山区天然林群落13个乔木种群的种间关联性，并对13种植物种群的生态位宽度和生态位重叠进行研究。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。