理论模型

A theoretical model of wavelength conversion based on cross gain modulation in semiconductor optical amplifier is derived. Characteristics of extinction ratio of converted signal under both co- and counter-propagating scheme are discussed in details.

建立了基于半导体光放大器-交叉增益调制的波长转换理论模型，利用分段方法对交叉增益调制波长转换器同向和相向两种工作方式下消光比特性作了详细的研究。

Based on a wavelet and multiscale analysis of theoretical model data and measured data and a comparison of the application results between the upward continuation and the wavelet and multiscale analysis, the authors hold that the wavelet multiscale decomposition of magnetic anomaly can play an important role in search for deep-buried mineral deposits.

为了弄清这些问题，笔者通过小波多尺度分析理论模型数据和实测数据进行分解处理，对比了向上延拓和小波多尺度分析方法在磁测资料处理中的应用效果，证明了磁异常小波多尺度分解方法对矿山的深部找矿具有积极的作用。

He consistance of the population dissociation coefficient method andthe sample dissociation coefficient method for the calculation of structural reliabilityin solid rocket motors was reviewed.

依据结构强度－工作应力理论模型，应用数理统计方法和对某团体发动机大量试验数据的实例计算，证明了总体变异系数法和样本变异系数法在结构可靠性计算中的一致性。

The characteristics of pressure drop of wire packing rotating packed bed absorber in air independent propulsion system are analyzed under counter-current condition and the model of pressure drop is built.

对不依赖空气动力装置系统不锈钢波纹丝网填料旋转床吸收器在气液两相逆流条件下的气相压力降特性进行了分析，建立了压力降预报理论模型。

Although the mechanisms at work in the synthesis of such elements are still unclear, theoretical models predict that actinide production in an explosive environment is dependent on several factors, including the time-scale of the explosion.

虽然机制，在工作中的合成等因素仍不清楚，理论模型预言锕生产呈现爆炸性环境是取决于几个因素，包括时间尺度的爆炸。

There is also a lack of the forced response analysis for the turbine blades with dampers.

但是目前缺乏有效的理论模型用于摩擦阻尼的性能计算以及透平阻尼叶片振动响应分析。

Based on the Darcys law, the theoretical model of permeability measurement was established. And the influence of different testing methods and major process parameters such as fabric structure, fiber volume fraction, injection pressure, flow rate and resin viscosity on preform permeability were investigated in details. It was found that the permeability of fibrous reinforcement mainly lied on the preform architecture.

文中首先根据达西定律建立了渗透率测量的理论模型，深入研究了不同的测试方法及主要工艺参数(纤维织物织构、纤维体积含量、充模压力、流动速度、树脂粘度)对渗透特性的影响规律，发现多孔介质增强材料的渗透率主要取决于纤维织物的结构形式，预成型体孔隙分布及其体积分数、压实性对渗透率有较大的影响，提高充模压力和流动速度可以缩短充模时间，在一定程度上可以提高渗透率。

According to the source characteristics and the desired illumination on the target plane, a set of differential equations were detruded based on the existing theoretical model by using the solid coordinate system and the energy conservation theory.

根据已知的光源发光特性和所需实现的照明面上的光分布，基于理论模型，结合立体坐标系和能量守恒定理，推导得到微分方程组。

The component activity coefficients in systems of tributyl phosphate, diluents and water are calculated with the theoretical model for chainlike molecules derived in paper.

对链状分子体系用微扰理论模型计算了磷酸三丁酯、稀释剂和水体系的活度系数。

The influence of charging parameters (such as charging voltage, charging time and charging temperature, etc.) on piezoelectricity and its thermal stability of cellular polypropylene film electrets was studied by means of contact charging and constant voltage corona charging methods and the thermal stimulated discharge technique.

通过接触法充电、恒压电晕充电，以及开路热刺激放电技术，对充电参数(例如充电电压，充电时间和充电温度等)对聚丙烯蜂窝膜驻极体的压电性及其热稳定性的影响的研究，并从孔洞型薄膜压电体的材料结构和理论模型出发，讨论了这些参数对其影响的原因，分析了与压电活性密切相关的空间电荷的动态特性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。