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This paper uses an improved charge density method and a more realisticcathode operating mode to simulate the electron optical properties of field emission guns. In the paper a special 6-point quadrature formula has been derived to accurately calculate potentials near theemiter surface and a spherical diode model has been adopted with the cathode operating at the partial space charge limitation.

场发射枪电子光学特性的数值模拟刘志雄，沈文忠，西门纪业（北京大学电子学系，北京100871）本文利用改进的电荷密度法和更接近于实际的阴极工作模型来模拟场发射枪的电子光学性质。

By apperance, Africans are more close to the quadrumana, such like their high cheekbone, deep eye socket and pitched lips.

从外貌上来看，非洲人长相更接近于灵长目科，高颧骨，深目，上唇前凸。

This year's rainfall came close to average.

今年的降雨量接近于平均水平。

Such a message is more relevant than ever before in light of the current rampancy of multiculturalism.

唯有如此，我们才能在美国历史研究中更接近于"那一高尚的梦想"——客观性。

The numerical results under different methods, especially the simulation of recirculation region and reattachment length were carefully checked and compared.

比较不同修正方法下的圆管湍流计算结果，尤其是回流区域和再附着长度的模拟结果表明：变模型常数的κ-ε模型有效地的增加了近壁区域的湍能耗散率，使再附着长度的计算结果更接近于实验结果。

We will have more information closer to the release date.

我们将有更多的信息更接近于发布时间。

On some issues this year the repo rate has fallen close to zero.

今年一些债券的回购利率已经降到接近于零。

Ritz variation method was used to find the numerical relation between the energy near the ground-state of the hydrogen molecular ion H 2 + and the changes of the variation parameter and the bond length,the computation formula of bond length and ground-state energy for H 2 + was also obtained by means of the method of parabolic interpolation .

用Ritz变分法求出了氢分子离子H2 +基态能量附近的能量随变分参数和分子键长变化的数值关系，并用抛物线插值法获得了H2 +键长和基态能量的值及其计算公式，比文献 [1，2 ]更接近于实验值。

Sit inside the car and its high roofline and large windscreen will give a driving impression more akin to an MPV 's than a family hatchback's.

车箱内，高车顶和宽大的挡风玻璃会坐在驾驶的印象更接近于 MPV 具有比一个家庭掀背的。

Among the 5 enzymes, the increase of activity of saccharase was most significant, whose measurements in 0~10 cm soil of 5, 10 and 22 age plantations were 76.80, 167.27 and 261.63 times respectively of the semi-moving sand dune. The soil biological activities in 22-year plantation were already close to that in the natural community.

土壤酶中蔗糖酶的活性增加最为迅速，5、10和22年生群落0~10cm土层中蔗糖酶的活性分别是半流动沙丘的76.80， 167.27和261.63倍。22年生群落的土壤生物活性己接近于天然群落，处于相对稳定的状态。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了