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The full space calculation model, which suits for the asymmetric structure sometimes even including air below the surface of medium, can enable simulative result to approach real one. The FDTD algorithm based on the mixed ABCs is proper to calculate the transmission line where the electromagnetic wave is transmitted in order to send electromagnetic energy along central conductor. The calculation efficiency will be raised if the PML absorbing boundary condition is set on both planes of transmitting direction and so is the MUR two-order absorbing boundary condition in the other planes.

全空间计算模型是适合所有的不对称结构的待研究体的,而且包括了介质下面的空气部分,使仿真更加的接近实验真实情况;基于MUR-PML混合吸收边界条件的时域有限差分法非常适合计算传输线这种结构,因为传输线是传送电磁波的,电磁能量主要是沿着中心导带行进,因此在两个传输端面上设置PML完全匹配层吸收边界条件,在其他面上设置MUR二阶吸收边界条件,会大大提高计算效率,而且计算结果与XFDTD仿真软件计算结果相比较,基本趋于一致。

Most of them rely on the central limit theorem, that states that the mean of N independent realizations of a random variable with mean u and variance d^2 approaches a normal distribution with mean u and variance d^2/N .

在蒙特卡罗评估框架内大量的各种选择性算法已经被推出,他们中的大部分依赖于中心极限定理,一个均值为U方差为D^2的随机变量的N次独立实现的平均值接近于一个均值为U方差为D^2/N的正态分布。

After toiling up the Missouri all summer , the group wintered near the Mandan villages in the center of what is now North Dakota.

在整个夏天的艰苦跋涉后到密苏里州上面,队伍到冬天时接近了现在北达科他州的中心-曼丹人的村庄。1805年春他们继续他们的旅行。

Using newly available data on worldwide cancer incidence to map cancer rates in relation to proximity to the equator, researchers at the Moores Cancer Center at University of California, San Diego have shown a clear association between deficiency in exposure to sunlight, specifically ultraviolet B, and kidney cancer.

用新提供的数据,全世界的癌症发病率,以地图癌症发病率和死亡率的关系,以接近赤道,研究者在moores癌症中心,在加利福尼亚大学圣迭戈分校,表现出明确的相关性缺陷暴露在阳光下,特别是紫外线乙,和肾癌。

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因:1取代芴酮的刚性结构产生高的空间位阻,阻止了手性催化剂的接近;2潜手性中心旁的两个芳香环不仅立体构型非常相似,而且高度的电子相似,很难被手性配体识别。

If you were at Verizon Center last night and saw Yao suction hope out of the arena every time the Wizards got close -- scoring 23 in the fourth quarter alone, hitting every pressurized fallaway jump shot he needed including the clinching basket with 11.1 seconds left -- you were a part of the NBA zeitgeist this season.

如果昨晚你在Verizon中心(应该是奇才的主场体育馆,译者注),看到了姚明每次在奇才追分接近时熄灭对方的希望--在第四节独自得到23分,命中了每个高压下他需要投中的后仰跳投,包括最后11.1秒时从人群中抢到篮板--你是这个赛季NBA时代精神的一部分。

The characterization of the coked catalyst shows that the deactivation of catalysts is caused by a jam of bulkier molecules, which are the alkylbenzenes from both reactants and products, so the deactivation cannot be avoided.

苯与长链烯烃的烷基化反应过程中,β沸石催化剂的失活是由于产品直链烷基苯本身和原料中带入的杂质芳烃逐渐堵塞孔道、阻止了反应物分子接近活性中心引起的,是由晶内开始逐渐向外发展的。

Hexi plate from the current building, the large number of real estate surrounded by the Olympic Sports Center, very close to the body can raise the price advantage to win the signs.

河西板块从目前的建设,大量的房地产包围的奥林匹克体育中心,非常接近人体可以提高价格优势赢得的迹象。

By adopting the center arm six-bar steering mechanism and using the analytical method to synthesize the four-bar mech...

采用中心臂六杆转向机构,由解析法综合出符合要求的四杆机构,再将其绕中间位置镜像,并确定适当调整各杆的位置,使其在给定输入转角范围内,输出转角值尽可能接近阿克曼原理计算的输出值,使车辆获得良好的转向性能。

With Linear Time-Invariant modeling of phase noise and definition of"effective resistor", we analyze the critical parameters of the circuit and calculate the value of phase noise at the 1 /f~2 region. 3. A 4.2GHz VCO tuned by an accumulation-mode MOS varactor in TSMC 0.35μm SiGe BiCMOS process is obtained after debugging with the simulator SpectreRF.

以低压、低功耗、低相位噪声和较大调谐范围的设计目标对压控振荡器进行设计优化,最后得到由积累型MOS变容管调谐的压控振荡器,电源电压为1.5V,功耗约10mW,中心频率为4.2GHz,调谐范围为28%,在频率偏移量为600kHz处的相位噪声为-128dBc/Hz,与线性时不变模型下的理论推导结果非常接近。

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In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国,慢性酒精中毒,肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题,你可以随时联系我。

Very pretty, but the airport looks more fascinating The other party wisecracked.

很漂亮,不过停机坪更迷人。那人俏皮地答道。