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It is found that in land surface model, soil thermal and hydraulic properties, parameterized from Farouki (1981) and Cosby (1984), are much depended on the values of .

使用NCAR陆面过程模式和荷兰Cabauw 1987年的大气观测资料,考察了在 11种不同的土壤条件下陆面过程模式所模拟的地表能量及水分循环的差异。

An optical system with refraction and total internal reflection was proposed according to the luminous characteristic of LED and the law of energy conservation. The ordinary differential equations satisfying the spots on the contour curve of TIR refractive and reflective planes were established. The coordinates of points on profile curves were obtained by solving these ordinary differential equations using Runge-Kutta method. The profile curves were acquired by curve fitting of the coordinate spots with software UG, and then TIR model of the projector and data of the surface shape suitable for NC manufacture were obtained.

根据LED的发光特性以及能量守恒定律选择采用折射全反射光学系统,通过建立TIR折射面及全反射面轮廓曲线上的点所满足的常微分方程,利用RungeKutta求解常微分方程得到轮廓曲线上点的坐标,再在UG中对坐标点进行曲线拟合得到轮廓曲线,进而得到TIR模型及适合数控加工的面形数据。

The analyses of orbital interaction based on energy bands and DOSs indicate that there is obvious covalent interaction between Ni-O.

能量计算表明,NiO(001)面表面能小,比较稳定;NiO(111)面则表面能大,不稳定,与实验结果一致。

According to the boundary relations of the electromagnetic field, and based on the phenomena of double refraction and double reflection in crystals, the reflectivity and transmissivity are deduced at boundary when an extraordinary beam is incident from an isotropic medium upon a crystal or from a crystal to an isotropic medium with optical ax.

为分析非常偏振光在晶体表面的能量损耗,给出一种求解反射率和透射率的方法,即根据电磁场的边值关系以及晶体的双折射和双反射现象,求解晶体光轴在入射面内时,非常偏振光从各向同性介质入射到晶体和从晶体出射到各向同性介质两种情况的反射率和透射率的方法,并给出反射率和透射率的解析解,同时得到对于晶体光轴在入射面内的情况,光轴的取向对非常偏振光反射率的大小几乎没有影响,但对产生全反射的临界角θc影响较大的结论。

The structures and stabilities of the ground-states for Cu13-nAgn clusters have been studied by Gupta model potential based on tight binding second moment approximation in combination with a genetic algorithm. It is found that the lowest energy structures of the pure clusters (n=0,13) are perfect icosahedron, and the structures for the bimetallic clusters (n=1~10) have stable structure which are slightly deformed with respect to the perfect icosahedron, The Cu atom prefers to occupy the center of the clusters with higher coordination numbers.

在混合团簇基态结构优化的遗传算法方案中增加了交换算子,结合Gupta紧束缚模型势研究了Cu13-nAgn团簇的最低能量结构,选择合适的交换和杂交概率,可有效地提高优化效率,优化结果表明,Cu13和Ag13是全对称的二十面体,n=1~10的混合团簇能形成稳定结构,其构型是在二十面体基础上发生畸变,Cu原子趋于处在团簇中心,随着Ag原子数目的增加,原子间的平均距离单调增加,团簇的结合能单调减小,Cu2Ag12和CuAg12只存在亚稳结构。

So, the aromaticity of acenaphthenyl groups in C_2 gum should be the least. In order to explain the reason, quantum chemical calculation is utilized. The optimized geometrical structrures of condensed aromatics in C_1 gum, C_2 gum and C_3 gum are calculated at B3LYP/6-31G* levels. We find that some phenyl groups in acenaphthenyl groups are coplanar and have the largest conjugated structure.

为了解释其原因,我们利用量子力学方法进行了计算,研究了三种稠环基团在B3LYP/6-31G*基组水平下优化得到的几何结构,发现苊式多苯基苯基中的萘环和中间的苯环共面,电子离域性最大,而其他二者所有苯环都不共面,发生了明显地扭曲;同时,在优化几何结构的基础上,对三种化合物进行了前线分子轨道的分析,利用密度泛函理论方法(density function theory,DFT)计算了稠环基团的最高占有轨道和最低未占轨道之间的能量差,即能隙,发现C_2胶上苊式多苯基苯基的Eg最小,解释了C_2胶具有最好的辐射保护效果的原因。

The theory of stack technique of variable binning comes from definition of first Fresnel Zone .

变面元叠加技术的理论基础来源于第一菲涅耳带定义,据此,可以随深度增加进行扩大面元处理,以增加同一CMP道集内的叠加道数,达到增强有效波能量且消除各类干扰波的目的。

It is difficult to be simulated and analyzed due to the excessive surfaces, complex structure and locomotory parts in zoom lens. All the transmission planes taken as the partial reflection and partial transmission planes were simulated with ASAP(advanced system analysis program)and the stray rays on "dangerous surfaces" which easily generate the ghost images in zoom lens were analyzed. Based on it, the zoom lens was optimized and the quality of image was improved by changing the curvature and refractive index of the second reflection planes.

利用ASAP软件模拟每个透射面作为部分透射、部分反射的表面,对变焦光学系统非轴上光进行分析,模拟出变焦系统的光学元件表面和光机内壁,实行实际光线追迹,然后以像面为研究对象,进一步实施实际光线追迹,模拟出全部散射光在像面上的能量分布,找出鬼像形成的原因,并在此基础上通过改变二次反射所在面的曲率或改变所在面的折射率两种方法对变焦光学系统进行优化,减小鬼点数目,以提高系统的成像质量。

Once more than one monolayer Pd is deposited on it and annealing to 700K~1000K, the structure of surface will transfer from planar (111) to faceting{112}, and pyramids with different size are formed on the surface.

所谓的皱化现象是由於bcc(111)本身就是较为不稳定的面,超过一层钯在钨(111)经过退火至700K~1100K,会露出能量较低的{112}面而形成遍布不同大小的金字塔的表面。

According to the theory that the shape of seal rock control petroleum to migrate along with ridge, ray-tracing technique is adopted to forward hydrocarbon migration pathway. This technique advanced fluid potential by combining source sag and energy field.

东部凹陷中段为一常温常压盆地,运用流体势分析油气运聚意义不大,根据封闭面底部形态控制油气脊运移原理,本次研究采用射线追踪技术正演油气运聚路径,该技术基于油气二次运移的相对能量行为进行油气运移路径的三维分析,将生烃凹陷与能量场结合起来,是对流体势分析技术的重要改进。

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Lao Qiu is the Chairman of China Qiuyang Translation Group and the head master of the Confucius School. He has committed himself to the research and promotion of the classics of China.

老秋先生为中国秋阳翻译集团的董事长和孔子商学院的院长,致力于国学的研究和推广。