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Based on the investigation of 12 plots Betula platyphylla population with an area of 6 000 m^2, the size structure and the life table of the population were established and the survivorship of B, platyphylla population was analyzed by the curves of survivorship, mortality rate, hazard in this paper.

根据12块总面积为6000平方公尺样地的实地调查资料，分析了白桦种群的径级结构，编制了该种群的特定时间生命表，绘制了存活曲线、死亡率曲线和损失度曲线，并用4个生存函数进行种群的生存分析。

In this paper, the effect of different size of immature embryo on embryogenic calli induction and regeneration of B.

试验主要以二穗短柄草未成熟胚为外植体，研究了胚的大小对愈伤组织的诱导和再生的影响。

A off-line real-time cameral control method is proposed in this paper, which can stretch image contrast and enhance SNR. Benefit from the control method, following work, such as detecting, identifying and tracing are easy. Because of the small size, the system is easy to carry and is suit for open country use.

本文提出的相机控制系统克服了传统相机控制的缺点，可以脱离计算机进行实时控制，并对图像进行能量累积，提高图像的信噪比，可以更好地实现下一步的检测、识别和跟踪处理，而且该系统体积比较小，方便携带，适宜外场工作。

Humidity is too high, the water vapor in the air, that occurred on gold ink and chromotropic, but will also affect paper substrate material deformation of the water content, size, resulting in misregister, and so on.

湿度过高，空气中水蒸气的含量高，容易使金墨发生变色，而且还会影响纸张承印物材料的含水量，发生尺寸变形，从而造成套印不准等故障。

Monte Carlo simulation is one of effective ways to get this kind of dosimetric parameters. In this paper, the absorbed doses at the central axis in different phantoms with inhomogeneity media and finite sizes for small field size beams were simulated with Monte Carlo code system EGSnrc, respectively.

本文利用蒙特卡罗方法模拟计算了临床上常用的点源光子束在有限宽非均匀模体中的沉积能量，研究了不同射野条件下中心轴上的剂量分布，并用剂量扰动因子定量分析了剂量增强或减弱效应的强度。

In this paper, cholinergic neurons was mapped in the two kinds of birds (Emberiza rutila and Fringilla montifringilla) by using immunohistochemical method.The soma size and cell density of cholinergic neurons in the three song control nuclei, the higher vocal center, the robust nucleus of the archistriatum and area X, were measured and compared. Here we discussed the distribution of cholinergic neurons and their effect on the process of song producing and song learning.

本文以中国北方地区常见的两种鸣禽栗鹀和燕雀为材料，应用免疫组化方法，对两种鸣禽发声控制核团，即上纹状体腹侧尾核或高级发声中枢、古纹状体粗核、X区内胆碱能神经元的胞体大小和胞体密度进行了观察测量，旨在探讨胆碱能神经元在发声控制核团内的分布情况及其在鸣啭产生和学习过程中的作用。

Limited by the condition, there are many problems in the fire protection design of enlargeable engineering. The central question of this paper is to present a fire protection design plan which is safe, reliable, rational and economic. The requirement to the plan is not only to satisfy the national fire technical standard of engineering construction, but also to combine the actual state of the weather, geology, filed size, general engineering such as the water supplying, power supplying, air-in, heating and the level of the fire defending.

怎样按照国家有关工程建设消防技术标准并结合拟建工程的现场气象、地质、场地大小条件和供水、供电、供汽、供热等公用工程以及消防保卫的现状，提出安全、可靠、合理、经济的消防设计方案是本文研究的中心问题。

The seismic behavior of great size thin wall reinforced concrete pipe columns is discussed through model experimentations and finite element methods in this paper, after taking Air Cooled Condenser system structure of a main factory building of the large capacity power plant as experimentative prototype.

中文摘要：本文以某大型火电厂空冷凝汽器系统支架结构中的钢筋混凝土管柱为原型，通过模型试验和有限元分析，研究了大尺寸薄壁钢筋混凝土管柱抗震性能等问题。

The paper gives a detail analysis on some factors affecting on size of flotation bubble such as property of mineral water mixture, bubble generation mode and device and frother etc.

文章从浮选矿浆性质、发泡方式及装置、起泡剂等方面，对浮选气泡大小的影响因素进行了详细分析。

However, the heat transfer enhancement mechanism, as well as the effect of various parameters, such as configuration size, on the enhancement are not understood clearly yet.In this paper, a unique kind of configuration, lunate channel, is adopted as the flow channel.

本文采用独特的通道结构形式——极限偏心环缝，在宽广的参数范围内详细研究了这种狭缝通道中低温气液两相流体的流动及佛腾传热特性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。