查询词典 interval

If the first row interval numbers take zero as a Lower bound, then the character equation has pairs of conjugated imaginary radixes, and the system is in critical stability.

如果第一列区间数以零为下界，则特征方程有成对虚根，系统临界稳定。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

After adjustment for body mass index and other potential confounders, the relative risks of total mortality were 1, 1.28 (95% confidence interval , 1.04-1.58), 1.40 (95% CI, 1.14-1.72), 1.54 (95% CI, 1.26-1.88), and 1.95 (95% CI, 1.60-2.38) across the lowest to the highest waist-hip ratio quintiles.

在调整体重指数和潜在的混杂因素后，全部死亡率的相对危险在参照组为1，在从最低到最高的腰臀比值五等分后的的组中分别为：1.28 (95%可信区间， 1.04-1.58)， 1.40 (95%可信区间， 1.14-1.72)， 1.54 (95%可信区间， 1.26-1.88)，和 1.95 (95%可信区间，1.60-2.38)。

For urine specimens obtained at 21 to 32 weeks, the adjusted odds ratio for the risk of preeclampsia to begin before 37 weeks of gestation was 22.5 (95% confidence interval, 7.4-67.8) for the lowest quartile of control PlGF concentrations (18 pg/mL), compared with all other quartiles.

这项研究的限制因素，包括样本几乎是在10年前获取的；每一位女性的尿液样本只取样三次；缺乏子癫前症的类似症状资料。

Allows the interval between valve and piston maintenance to be greatly extended (when compared to standard mineral oils ).

与一般矿物油比较，能大大延长气阀与活塞的维修间距，延长操作时间，提升工作效能。

The results indicated that soil evaporation around barley root was restrained effectively in sunny day when the positive electric field was applied. If the field voltage and interval time are constant, the electric field intensity will be different under the different pole distances, and the effect of boosting plant growth will be different by restraining evaporation and moisture.

试验结果表明：晴天施加正向空间电场可以有效地抑制大麦根系周围土壤水分的蒸发，当电压及间歇工作时间保持不变时，不同异极距下其电场强度不同，表现出的抑蒸聚水促生效果不同。

It's recommended that the pre-harvest interval of metalaxyl-M in potato set at 14 days.

综合多方面因素，按照推荐剂量72g/hm^2处理，建议精甲霜灵在马铃薯上最后一次施药距收获的安全间隔期可考虑暂定为14d。

However, when AV interval was shorter than 80 msec and longer than 180msec, there was reduction of LVOTG, yet the CO was also reduced. The results showed that the hemodynamic improvement must depended on the state of pre-excitation of ventricle as well as the optimal left ventricular filling.

且在AV间期为100至120毫秒时出现最佳血液动力学效应，而AV间期在小于80毫秒、大于180毫秒时，虽有左室流出道压力阶差的降低，但心输出量均有下降，提示血液动力学的改善必须依赖右心室的提前激动状态及最佳的左心室充盈。

The next development in musical notation were "heighted neumes", in which neumes were carefully placed at different heights in relation to each other. This allowed the neumes to roughly indicate the size of a given interval as well as the direction. This quickly led to one or two lines, each representing a particular note, being place on the music with all the neumes relating back to them. At first these lines had no particular meaning and instead had a letter placed at the beginning indicating which note was represented. However, slowly the lines indicating middle C, and the F a fifth below, became most common. Having at first been merely scratched on the parchment, the lines now were drawn in two different colorded ink: usually red for F, and yellow or green for C.

音乐记谱法的再一次新发展是heighted neumes，这种记谱法标识出音符之间的音高关系，这样就使得纽姆谱可以粗略并直接地标记出指定音程的增减，这样的标识方法导致了谱上一线或者二线的出现，每条线代表一个特定的音符，这个音符与纽姆谱中所有的音符的音程关系都能被标识出来，最初这些线并没有什么特殊的含义，反而会有一个字母被放在开始的位置表明代表哪个音符，渐渐的，线代表中央C或者比C低五度的F 变得最常用，这些一开始只不过在羊皮纸上刮出的线，开始用两种不同的颜色书写，红色代表F，黄线或者绿线代表C，以上的这些便是我们所知道的音乐记谱法发展的开端。

In Group I, catheter was placed into central vein. PCIA solution contained 0.025% morphine. PCIA was commenced with a loading dose (2-5 mg) of morphine. The PCIA pump was set up with a background infusion of 2 ml/h, 1 ml bolus dose and a 15-minute lockout interval. In Group II, four intercostal nervers were freezed (-70 degrees Celsius) for 90 seconds. Pain intensity was measured at differnt time ［1, 4, 8, 12, 24, 48 and 72 hour after operation］ using VAS scoring.

选择80例接受开胸手术的病人，随机分为静脉镇痛组和神经冷冻组，静脉镇痛组行术后病人自控静脉镇痛，后者采用北京库蓝公司JT-1型冷冻治疗仪在关胸前对切口所在肋间及上、下各一肋间和放置胸引瓶所在肋间的肋间神经进行冷冻，以VAS评分判断两组术后胸部切口疼痛情况，并记录不良反应。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。