周期

The dependence of noncollinear angle and the corresponding grating periods on signal wavelength for satisfying quasi phase-matching and group velocity matching simultaneously of periodically poled RbTiOAsO4 in noncollinear quasi phase-matched have been carried out. The tuning characteristic of noncollinear interaction in group velocity matching situation has been analyzed.

研究了非共线准相位匹配过程中，周期极化 RbTiOAsO4晶体同时满足准相位匹配和群速匹配条件的非共线角和相应的极化周期随信号光波长的变化，同时分析了满足群速匹配条件时，非共线准相位匹配的调谐特性。

Based on noncollinear optical parametric amplification in periodically poled lithium niobate which is realized by quasi-phase matching technology, we consider the possibility of semi-noncollinear phase matching method between collinear and noncollinear geometry.

基于周期性极化铌酸锂晶体的准相位匹配光参变放大过程，通过倾斜周期极化铌酸锂晶体中极化域一定角度，实现了介于共线匹配方式和非共线匹配方式之间的一种半非共线型准相位匹配方式，并以该匹配方式下的各光矢量几何关系得出相位匹配曲线，找到在特定抽运光和信号光波长下能获得宽带增益放大的周期极化长度。

The record qualitatively shows that overall U.S. consumer spending tends to be stronger in the early stages of an El Nifio. This may be due partly to, and initially from, less nondiscretionary spending on energy, for example, and more spending on other discretionary items. Moreover, it takes about 912 months for the impact of the warming in the Pacific Ocean (as reflected by the Southern Oscillation Index) to show up as abnormally wet weather over a widespread area of the United States. The sunspot cycle might be another reason for expecting longer-run impacts climate on the economy. Galileo was credited with discovering sunspots around 1610. Ever since that time, there has been a debate, which at times has been intense, on the effect of solar activity on man, weather, agriculture and the whole economy.

可靠的记录显示：全美消费者消费倾向在EI Nifio早期较强劲开始阶段应付部分少数属刚性支出，如能耗更多的支出属可自行选择的内容此外，受太平洋海域升温的影响约持续9-12个月（摘自the Southern Oscillation Index）表现为异常的潮湿天气弥漫美国广泛的地区太阳黑子周期可能是气候对经济更长期影响的另一个原因可以认为Galileo发现太阳黑子周期大约在1610年从那时至今，太阳活动对人天气农业和整个经济的影响一直有争论，有时很激

In this method a windowing parameter estimation algorithm is applied to obtain the initiative value of iteration for the nonuniformly sampled record.

对周期信号采样序列重建问题，提出了一种基于采用时域布莱克曼窗减少频谱泄漏的自适应迭代重建算法，该算法利用对采样序列加窗的方法，有效地降低采样长度为非整数倍信号周期所产生的频谱泄漏。

The influence on energy/power measurement due to nonuniformly sampling is analyzed and the energy relation of the nonuniformly sampled signal in time domain and frequency domain is deduced.

如果输入周期信号的各次谐波谱线和各寄生谱线均不产生重叠，则可利用本文提出的方法计算出各通道的取样时间偏差的估计值，并证明了周期信号在其占有频带内可保证各次谐波谱线和各寄生谱线不发生重叠。

In contrast, the nucleoli of dinoflagellates and yeast persisted throughout the cell cycle without cyclical alternation of disappearance and reappearance.

甲藻和酵母的核仁在整个细胞周期中始终存在，没有消失和重现的周期变化。

Nymphal development was greatly influenced by photoperiod with different photoperiodic response pattern occurring between Okinawa and Hachijo population.

结果表明，光周期显著影响两地理种群的若虫发育，然而，冲绳和八丈岛种群间显示不同的光周期反应模式。

Effects of photoperiod on nymphal development were investigated in two subtropical populations of Periplaneta japanna living on Naha, Okinawa Islands (26N) and Hachijo island (N33N), Japan.

为弄清光周期对一种亚热带蜚蠊若虫发育的控制机理，检测了光周期对冲绳(26°N)和八丈岛(33°N)两个地理种群若虫发育的影响。

This kind of SWS decreased the field strength in the structure efficiently and enhanced the power capacity of the device obversely in the THz regime. The structural parameters were optimized with the numerical simulation method, and a set of best parameters were presented.

采用数值模拟的方法对该慢波系统的结构参数进行了筛选，最终选取波导内半径为2mm、槽深为0.2mm、槽宽为0.6mm、单周期长度为1mm，共采用17个周期。

Real estate analysis from angle that quantize to real estate annotation explanatory note of market against cycle chess match of policy, it is exploration and summary of the government policy law; The effect analysis of the policy against cycle of the real estate is to practise the perceiving to the policy of the real estate ocularly of the result, make prospective test to the government policy.

房地产反周期政策的博弈分析是从量化的角度对房地产市场的诠释，是对政府政策规律的探索和总结；房地产反周期政策的效应分析是对房地产政策实践效果的直观感知，是对政府政策制定前瞻性的检验。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失