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For the multi-layer absorber composed of perforated plate, composed of perforated plate and cavity, composed of perforated plate, porous absorption material and cavity, the absorption coefficient is theoretically calculated.

论文回顾了主动消声、吸声降噪的发展历史与现状，阐述了主动吸声降噪有待解决的关键技术问题，提出了论文的主攻目标和研究内容。

Growth. It's theoretically easier to grow Centrex than a standalone PBX or key system, which usually has a finite limit.

成长性。理论上讲，与独立的 PBX 或按键系统相比，Centrex 易于进一步开发，通常限制较少。

A leaf theoretically compound, though only expressing a single leaflet and appearing simple, as in Cercis.

具一小叶的 Unifoliate 理论上是复叶，实际为单个小叶，看似一枚单叶的叶子，如紫荆。

Based on Bezier curve continuance of first－order and second－order derivative, the characteristic vector equation of two Bezier curve is presented in point of intersection. The algorithm is not only of high accuracy with all of the interpolated points being on the curve theoretically, but also of very high speed in the real－time interpolation processes. The interpolation velocity does not change and the segment tolerance of interpolation can be control by selecting the parameter in cerement rationally every time.

为保证两段Bezier曲线在连接点处一阶导数、二阶导数连续，导出了两段Bezier曲线特征向量应满足的关系方程，Bezier插补法不仅在理论上可使所有的插补点落在曲线上，而且实时插曲补速度高，每次插补时可合理地选择参数增量，能使插补速度保证不变，也可控制弓高误差。

Theoretically, the method of quantum chemistry calculation was used to demonstrate the feasibility and rationality of molecular modification for CGA.

同时，在理论上，采用量子化学计算的方法论证了该分子修饰的可行性和合理性。

Theoretically, chanciness truth is closely related with spirit actuality, but there is no chanciness that can exceed a reality. Even though in the most pure creative state, the artist just uses a pure way to reflect his life memory. Zhong Xi's chanciness is not the purportless meditation.

从理论上说，偶然性的真实与精神的实在是密切关联的，但并不存在一个超越现实的偶然性，艺术家即使在最纯粹的创作状态中，也不过是以最纯粹的方式反映了他的生活记忆。

Assist characteristic is analyzed theoretically and the feature parameters of straight-line assist characteristic curve are studied.

对助力特性进行了理论上的分析，探讨了初步确定直线型助力特性的特征参数的过程。

In the same time, the author compiled a set of computer program so that one can analyze the direction characteristic of the conformal array by using the PC computer theoretically.

论文中大量的分析结果使我们对机载共形阵的工作情况有了比较清楚的认识，弥补了国内该方面研究的空白。

With the concept, the fractional lower array power is formulated and it is theoretically proved that the power is finite and reasonable for beamforming, provided thatthe fractional order does not exceed the half of the noise characteristic exponent.

根据分数低阶统计量和零阶统计量，这部分提出强冲击噪声环境下表现出稳健的波束形成性能的三种新的波束形成算法：分数低阶最小方差无畸变响应波束形成算法、线性约束最小几何功率波束形成算法和最小几何误差波束形成算法。

In this thesis, we theoretically analyze the fundamental reasons of profitability of technical analysis, stating the time-varying characteristic of expected return series and predictability from historical returns and other factors.

本文从理论角度分析了技术分析有效性的基础，从历史收益率等角度出发阐述了收益率的时变性特征，结合收益率波动的记忆效应，为技术分析的核心前提假设即价格趋势的存在提供了国内外研究的实证支持。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。