查询词典 density

Given a planar point set,the moving least squaremethod is adopted to denoise and resample it so that the resulting point set is with low noise and uniform sampling density.Then the reliable signed distance field of the preprocessed point set is constructed by using the Level Set method.Finally,an algebraic B-spline function is adopted to fit the signed distance field by solving a linear equation system.

首先给定一个表示封闭曲线、可能带有噪音且分布不均匀的平面点云，采用移动最小平方(moving least square，简称MLS)方法对点云去噪、重采样，得到一个低噪音、分布均匀的"线状"点云，再通过Level Set方法建立该"线状"点云的离散几何距离场，最后用一个代数B-样条函数光顺拟合该离散距离场，代数函数的零点集即为重建曲线。

Secondly, by applying inverse Fourier integral transform to the displacement, and uniting the constitutive and geometrical equations, the analytical expression of stress in Laplace domain were derived. Thirdly, by defining dislocation density functions, the Cauchy singular integral equations were obtained according to the boundary condition and interface connection conditions, and the problem was reduced to algebraic equations by Chebyshev orthogonal polynomial. Based the these, the unknown coefficient of the algebraic equations can be solved by Schmidt method. Finally, the time response of dynamic stress intensity factor and energy release rate are obtained by inverse Laplace transform.

首先，利用积分变换方法，推导出粘弹性层的控制方程组；其次，引入位错密度函数，并结合边界条件和界面连接条件，导出反映裂纹尖端奇异性的Cauchy型奇异积分方程组，然后，应用Chebyshev正交多项式化奇异积分方程组为代数方程组，并采用Schmidt方法对其数值求解，最后，经过Laplace逆变换，求得动态应力强度因子和能量释放率的时间响应。

There was a linear positive correlation between the alkaline phosphatase activities and cell density.

液氮冷冻保存后复苏培养复层成骨细胞钙钴法碱性磷酸酶染色阳性率在45%以上，超微结构显示为高分化功能活跃成骨细胞。

The protein content, flax acid content and twenty carbon alkene acid content are increased with the increase of density.

种植密度对鹰嘴豆维生素B1和油酸含量的影响不显著。

The mechanisms of the ruthenium-catalyzed reaction of organic azide with terminal alkyne have been investigated using density functional theory.

采用密度泛函理论，对在Ru催化剂存在下，有机叠氮化合物和末端炔的反应机理作了深入理论研究。

Based on characteristics and connectivity of the groups in molecules,the group contribution method and topological method was combined together,a new method was developed which can be used to calculate the density of alkyne from molecular structure.

根据分子中基团的特性和连接性，将基团贡献法和拓扑方法结合在一起，发展了一种计算炔烃密度的新方法———基团键贡献法，该方法具有基团贡献法适用范围广和拓扑方法计算结果准确可靠的特点。

The results of experiments and analyses are as follows: under low density, there is no notable competition between individual plants, the function relation between height and biomass shows a "simple allometry"...

结果表明：植物在低密度条件下，个体间没有明显的竞争作用存在，株高与生物量之间表现为"简单的异速生长"关系，其异速生长表达式为 y =a + bx的形式；植物在高密度条件下，个体间存在着激烈的种内竞争，株高与生物量之间表现为"非线性的异速生长"关系，其异速生长表达式为 y =ax2 + bx + c的形式

Products Introduction: Silicon cycle, the department of the first type IV elements, is a non-metallic element, atomic number 14, atomic weight 28.80; density of 2.33g/m3; melting point of 1410 ℃; boiling point of 2355 ℃; resistively for 2140Ω.M; includes two types of stereotypes and crystal allotrope.

硅周期系第 IV 类元素，是非金属元素，原子序数14，原子量为28.80；密度为2.33g /m3；熔点为1410℃；沸点为2355℃；电阻率为2140Ω。m ；有无定型和晶体两种同素异形体。

The influence of configuration parameter of alnico in surface-mounted permanent magnet synchronous motor on waveform of airgap flux density is systematically analyzed.

系统分析了表贴式永磁同步电动机磁钢结构参数对气隙磁密波形的影响。

Permanent magnet synchronous motors ; alnico ; airgap flux density ; multi-objective optimization ; response surface model ; particle swarm optimization

永磁同步电动机；磁钢；气隙磁密；多目标优化；表面响应模型；微粒群优化算法

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。