双极的

In order to select the most appropriate method for the actual situation at the South China Sea, this paper designed models and used data from some region in the South China Sea to compare four RTP-L methods (the hyperbolic sine method, the suppression RTP filter method, the direct damping method and the pseudo-inclination method) in the wavenumber domain which change the RTP operator.

本文针对其中4种在频率域对化极因子做处理的方法(双曲正弦法，压制因子法，直接阻尼法，伪倾角法)，设计模型进行对比，并用南海某地区的实测数据进行4种方法的化极效果对比，选出一种最符合南海地区实际情况的化极方法。

Performance of dual-polarization SARs to distinguish three basic scattering mechanisms from an isotropic surface, a dipole, and an isotropic dihedral is studied theoretically. Performance of dual-polarization SARs to identify the eight scattering mechanisms inside the feasible region in H-αplane is analyzed, and a feasible division of H-αplane for HH-VV dual-polarization SAR is obtained in an experimental manner.

推导了双极化H-α平面有效区域的边界，从理论角度研究了双极化SAR对各向同性表面、偶极子和各向同性二面角三种基本散射的识别能力，通过实验分析了双极化SAR对H-α平面有效区域内八种基本散射机理的识别性能，并给出了HH-VV双极化H-α平面的一种可行划分方式。

The energy levels of free metallic ion were calculated with a 13 parameters model including the 2-body and 3-body interactions. The Stark energy levels of crystal field were calculated using the model proposed by Newman based on 1 electron orbital approximation The f-f oscillator strength calculation includes the contribution of electrostatic-induced, ligand polarization, vibronic-induced, magnetic dipolar transitions.

其中，自由f离子能级计算采用包括双电子与叁电子组态相互作用的二三参数模型，晶体场Stark分裂计算采用单电子轨道近似，用Newman角叠加模型计算晶体场参数。f-f跃迁振子强度计算包括静电诱导偶极跃、配体极化偶极跃、振动诱导电偶极跃迁及磁偶极跃迁的贡献。

A Study on Fraunhofer Double-Slit Diffraction by Applying Simulation Technology;2. Based on Kirchhoffs theory,the approximate intensity formulas of double-slit diffraction of Gaussian Beam is derived under paraxial approximation with power series expansion methods.

依据基尔霍夫衍射理论，利用幂级数展开的方法推导出旁轴条件下高斯光束双缝衍射的近似光强计算公式，并通过数值计算对双缝衍射的基本特性进行了讨论，得出了与其他文献一致的结论，得出了高斯光束下的双缝衍射极小值点比平行光束双缝衍射的极小值点向外移，观察屏中心光能变小；光强分布可由激光斑在衍射屏处的参数调制的结论。

It is seen that oxygen group function of additives is very remarkably in tribological characteristics, that is EP property of dihydroxy docosanoic acid without active element is very near to that of SO with active element sulfur.

双羟基廿二酸的极压性与不含氧基团的硫化烯烃十分接近，以液体石蜡为基础油，最大无卡咬负荷P〓值，前者为539N，后者为588N，再者相差49N，可以看出，氧基团的作用是十分显著的，即无活性元素的双羟基廿二酸的极压性可以十分接近于含活性元素的抗磨极压剂硫化烯烃。

The fiber length has only little influence on the basic density within the growth rings, and significant correlation at 0.01 levels was found between the basic density and the fiber length among the different rings. Only slight negative correlation was found between the basic density and the fiber width within the growth rings, but significant positive correlation at 0.01 levels was indicated between the basic density and the fiber width among the growth rings, contrary to that of fiber length. It was demonstrated that significant positive correlations at 0.01 levels between the basic density and fiber double wall thickness, fiber length to width ratio and double wall thickness to diameter ratio, significant negative correlations at 0.01 levels between the basic density and fiber diameter and diameter to width ratio, only slight negative correlation between the basic density and fiber width both in the same growth rings and among the different growth rings. No significant correlation was found between the basic density and the vessel morphological features, nor was the tissue proportion in the same growth rings. But among the different rings, it was found there was significant positive correlation at 0.01 levels between the basic density and the fiber proportion among the different rings, and significant negative correlation at 0.01 levels between the basic density and vessel-elements proportion and ray proportion, only slight negative correlation between the basic density and the parenchym proportion. Significant or no significant negative correlation was found between the basic density and the microfibril angle in the same growth rings, but significant negative correlation was found between the basic density and the microfibril angle among the different growth rings.

生长轮内纤维长度对基本密度的影响不大，而在不同生长轮间纤维长度与基本密度达极显著正相关，纤维宽度与此相反，同一生长轮内纤维宽度与基本密度极显著负相关，不同生长轮间只有微弱负相关；基本密度与纤维双壁厚、长宽比、壁腔比在生长轮内和生长轮间均呈极显著正相关，而与胞腔直径、腔径比均呈极显著负相关，仅与纤维宽度呈微弱的负相关；导管形态对基本密度的影响不显著；同一生长轮内组织比量对基本密度的影响也不显著，但不同生长轮间基本密度与纤维比量呈极显著正相关，与导管比量和木射线比量呈极显著负相关，与轴向薄壁细胞比量仅呈不显著负相关；生长轮内基本密度与微纤丝角呈显著或不显著负相关，但在生长轮间这种负相关达到极显著水平。

3D MDD patients showed significantly lower gray matter density than controls in right medial frontal gyrus, right temporal pole, bilateral putamen and globus pallidus, bilateral cerebellum. After treatment, gray matter density in right superior frontal gyrus, bilateral precentral gyrus, temporal pole, putamen and globus pallidus, and cerebellum in patients were still significantly lower than controls.

发作期抑郁症患者右侧额内侧回和同侧颞极、双侧壳核/苍白球和双侧小脑的灰质密度较正常人低；治疗后右侧额上回、双侧中央前回、双侧颞极、双侧壳核/苍白球和双侧小脑的灰质密度仍较正常人低。

The single mode dipole antenna is designed by the dipole microstrip theory, and two single-band antennas are combined with the two switches, forming a dual-band antenna. The performance of switch and antenna are obtained by HFSS software simulation, respectively.

根据偶极子天线原理，设计了单模微带偶极子天线，使用开关结构将两个单模偶极子天线连接在一起，实现了双模天线的功能。

The current are outputted to the electric engine after capacitance commutation, N pairs of electric engine coils are connected in series by two, 2N coil diodes are connected together with reversal direction; N PNP type triodes are connected together on the N pairs of electric engine coils in series; 2N switcher are connected at the lower part of the N pairs of electric engine coil in series; 2N the first one-way diode are connected between the PNP type transmitting pole and the drain electrode of the switchers; N the second one-way diodes are connected together between the collecting electrode of PNP type triode and the source electrode of 2N switcher.

电流经串联电容整流后输给电机，N双的电机线圈二二并联，2N个线圈二极管相互反方向连接；N个PNP型三极管串联在N双的电机线圈的上部；2N个开关器件串联在N双的各个电机线圈的下部；2N个第一单向二极管接在各PNP型三极管的发射极和各开关器件的漏极之间；N个第二单向二极管接在N个PNP型三极管的集电极和2N个开关器件的源极之间。

The geometries, electronic structures, one- and two-photon absorption spectra for a series of dendritic molecules have been studied.

与偶极矩化合物相比，八极矩分子具有更高的透明性和更大的双光子吸收截面，是更有前途的双光子吸收材料。

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％。