查询词典 patch box

In the process of urbanization, the regional landscape pattern of the three cities changed markedly, with an increase of patch density and fragmentation. In land use transects, the patch density and Shannon diversity index had higher correlations with the absolute distance to city center. Landscape index could detect the gradient and the direction of urbanization. The desakota regions of the three cities had different development features, and the urbanization process of the cities as at different stages.

结果表明：在城市化过程中，这3座城市城市化区域景观格局都有显著变化，斑块密度升高，破碎化加强；在样带上，斑块密度、Shannon多样性等指数与到市中心的绝对距离有较强的相关性，景观指数能检测出城市化的梯度和城市化的推进方向；3座城市的城乡融合区有着不同的发展特征，城市化呈现出不同的发展阶段特点。

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。

Therefore, polypropylene patch should be chosen according to patient requirement, i.e., light, soft, and wide-aperture patch, so as to reduce onset of complication.

因此应结合患者的情况选择轻质量、材质柔软、大孔径的补片，减少并发症的发生。

Nerve and ligament tissues could be clearly observed from light and soft patch, and this might and prevent hurt by mistake, improve repairing operability, enhance correct putting of patch, and decrease incidence of pain.

超薄轻质补片更柔软、更透明、操作容易，透过网片能清楚地观察到网片后方的神经和韧带等组织，可预防误伤，提高了修补中的易操作性，并且便于网片的正确放置，减少了修补后疼痛的发生率，而且网片的结构更有利于成纤维组织的长入，能很好地适应患者修补后因体位变动和肌肉收缩而产生的纵向和横向移动，患者修补后的不适感也极大地降低等优点。

The proposed antenna consists of a rectangular metal patch on a printed circuit board fed by a 50- coplanar waveguide. By cutting a C-shaped slot in the rectangular radiating patch,a frequency band notch will be created. The proposed antenna yields an impedance bandwidth of 3.1-10.6GHz with VSWR,except the bandwidth of 5-6GHz for WLAN.

天线采用印刷电路板上的矩形贴片作为辐射单元，并由同一面上的共面波导馈电，通过在矩形贴片上开一个C形槽来实现陷波功能，电磁仿真软件Ansoft HFSS10的仿真结果显示，合适地选择C形槽的尺寸可以调整陷波的中心频率和带宽。

It reallocates only once, to 65536, rather than just to the size needed, so it can be less memory-efficient than Chuck's patch (though, like his patch, it only reallocates if the response is larger than PACKETSZ, which defaults to 512 bytes). After reallocating, it forces a TCP query, rather than requiring the resolver library to do so (avoiding an extra round-trip between qmail and the name server, though if they're on the same machine or local network this is not a big worry).

它仅仅重分配一次缓存为65536字节，而不是分配正好需要的大小，所以它可能比Chuck的补丁内存效率低一些(虽然如此，像Chuck的这个补丁仅在反馈长度大于PACKETSZ--默认为512字节--情况下重分配缓存)重分配之后，它强制一个TCP查询，而不是要求解析库来作查询(尽管在qmail和名字服务器同在一个机器或者同在一个局域网络里面的情况下，这种查询不算什么负担，这样作还是避免了在qmail和名字服务器之间额外的往返)。

The most largest broad-leaved forest patch in research area carried most ungulates blocks.Ungulates blocks all mainly distributed in the most largest patch under various simulation scenarios.

研究区最大的阔叶林生境斑块承载了大部分的东北虎主要猎物种群集群，在各种模拟情景中，东北虎主要猎物种群集群均主要分布在这个最大的生境斑块内。

Firstly,we generated two depth buffers for occluder and receiver,discretizing the occluder to micro-patches;then,we calculated the depth value of shadow for each micro-patch and estimated the visibilities of them;finally,we computed penumbra extent for each micro-patch and projected soft shadow map on the scene to obtain real-time soft shadows.

首先为场景中遮挡物、接收面计算深度缓存，并离散遮挡物成许多微面；接着计算每个微面的阴影深度值，估计微面的可见度；最后计算微面半影范围，将软阴影图投影回场景中，得到实时软阴影。

In JavaScript we can create three kinds of popup boxes: Alert box, Confirm box, and Prompt box.

在JS里我们可以建立三种不同样子的popup boxes弹出框：警示框，确认框，信息框

Based on these characteristics, an improved S-box was constructed, with period of affine transformed pair as 16, period of iterative-output as 256 and algebraic expression of improved S-box and InvS-box as 252 items and 254 items respectively.

该改进S盒具有周期16仿射变换对，迭代输出周期为256，而且S盒和逆S盒代数表达式项数分别达到252项和254项。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。