查询词典 zero

In this paper,the figure of the fundamental frequency of tone zero is researched with normalized Autocorrelation function pitch detection algorithm and some feature of tone zero is provided.

利用归一化自相关函数法研究了轻声音节基频轨迹的特点，并给出了可用于识别轻声音节的一些基本声调特征。

Of zero, or the Null object None.of zero, or the Null object None.

空对象、值为零的任何数字或者Null对象 None的布尔值都是False。

The system state transition matrix is deduced, so the zero effort miss of the interceptor can he solved with numerical method under considering the earth's oblateness effect of J2. In order to make the thrust direction change smoothly and make the zero effort miss decrease quickly, the engine thrust is decomposed along the line of sight direction and perpendicular to the line of sight direction, and the distribution proportion coefficient is designed based on the required velocity gain normal to the line of the sight.

推导了系统状态转移矩阵，通过数值方法求解得到考虑地球扁率J2摄动项的拦截器零控脱靶状态，在此基础上将推力分解到视线方向和垂直视线方向，并根据垂直视线方向需要速度增量大小设计了推力分配比例系数，使得推力方向平稳变化且能快速减小系统的零控脱靶量。

The realize method of ITC strategy in FSTP induction generation system is studied. In order to improve stable performance of FSTP induction generation system, SVM-ITC (ITC based on space vector modulation) is investigated. Creation method of reference voltage vector which includes change trend and magnitude information of flux link and torque is presented. Because there is no zero voltage vector in four-switch system, a method which employs opposite vector in equal time to replace zero voltage vector is proposed. Two vector modulation schemes are presented.

为提高容错型四开关三相异步发电系统的稳态性能，进行了基于空间矢量调制的瞬时转矩控制研究，提出了包含磁链与转矩变化趋势与大小信息的电压参考矢量生成方法；针对四开关系统无零电压矢量的情况，提出用等时间相反矢量来代替零电压矢量的作用，并给出了两种矢量调制方案。

A square sign pattern matrix that does not have a zero row or zero column is sign potentially orthogonal if every pair of rows and every pair of columns allow orthogonality.

一个没有零行或零列的 n 阶符号模式矩阵是符号蕴含正交的，若每一对行和列向量都是蕴含正交的。

According to SIT, we could make the following hypotheses on the social behavior of a state: the state will favor in-group countries, take win-win strategy with the group it identifies, and be prone to cooperation in bilateral relations; the state will take non-zero-sum strategy with out-group countries and choose partially participation and cooperation; for the out-group countries with high hostility, the state will take zero-sum strategy, and choose non-cooperation or conflict.

根据社会身份理论，我们对国家的社会行为提出了如下假设：国家会更偏向于内团体国家，对于自己所认同的国家集团会从双赢的思维出发，选择积极合作的战略；对于外团体国家，一般会从非零和的思维出发，在双边事务中选择部分的参与和合作；而对于敌对性较高的外团体国家，一般会从零和的思维出发，在战略上选择不合作或冲突。

There are flags for overflow, underflow, invalid operation, divide by zero, is Zero, is Negative, etc...

在ps2上，标志用来指定不同的状态，像溢出检测，下溢检测，无效操作，被零除，零，否定等等，有些flag很少被游戏用到，disable extra VU flags"和"disable extra FPU flags的作用就是不执行额外的很少被游戏用到的标志代码

The ways of parallel resonant DC link and three-level control strategy were used in this power amplifier circuit. Output current ripple of power amplifier can be reduced as three-level power amplifier, all of power switches work on and off under the zero voltage switching or zero current switching, loss of switching and current ripple interference effectively reduced.

该电路在功率放大器三电平控制策略的基础上应用了并联谐振直流环节，保持了三电平功率放大器输出电流纹波小的优点，同时功率器件均工作在零电压或零电流条件下，开关损耗、电流纹波干扰有效地减小。

Nitrate-N content in 0~60cm soil profile with intercropped faba bean and pea are lower than the monocrops under zero N application and 225kghm^(-2) N application; while that with soybean lower than the monocrop at zero N application, but higher at 225kghm^(-2) N application.

玉米收获期，不施氮条件下3种豆科作物间作0~60cm土壤硝态氮含量均低于单作；225kghm^(-2)氮水平下，蚕豆、豌豆间作0~60cm土壤硝态氮含量低于单作，而间作大豆0~100cm土壤硝态氮含量高于单作。

Reductive dechlorination of polychlorinated biphenyls by zero-valent metal ;2. Zero-valent metals can be used to treat many kinds of pollutants including Organohalides,heavy metal,nitro-aromatic compounds,azo dye,perchloride and nitrate etc.

介绍了零价金属在处理环境污染物中的具体应用，包括卤代有机物、重金属、硝基芳香族化合物、偶氮染料、高氯酸盐以及硝酸盐等，指出零价金属可以通过还原和混凝吸附等作用有效地治理环境污染物，并分析了零价金属处理污染物的特点和应用前景。

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。