列阵

In this paper, firstly the elimination tree theory is introduced in brief, and the structure of Jacobian matrix is determined by use of symbolic factorization; then by use of sparse vector method each column of lower triangular matrix L and each row of upper triangular matrix U are solved.

介绍了消去树理论，并采用符号因子分解技术确定雅可比矩阵的结构，然后采用稀疏向量法求取L阵的每行和U阵的每列。

The new heliostat has a mirror array capable of line-tilting in order to realize a type of dynamically change optical surface which has different radius of curvature in both tangential and sagittal direction.

这是一种新型的定日镜，其中包括一个由行和列组成的镜阵，其子镜可以进行行和列方向的自适应的运动，以实时根据太阳光的入射角的变化而改变整个镜阵的曲面，实现了类似Harald先生提出的曲面。

Comparing with traditional LU numerical decomposition algorithm to solve each row of lower triangular matrix L and each column of upper triangular matrix U, the proposed method is easy to program and efficient In addition, the structure symmetry of Jacobian matrix and the experience of compiler optimization are also adopted in this research, it makes less required memory for the proposed algorithm and higher calculation efficiency.

这种算法和求取L阵每列和U阵每行的传统LU分解方法相比，具有编程简单、计算效率高的优点。另外，雅可比矩阵结构对称以及编译器优化的经验也应用到文中，使得算法不仅占用内存较少，且效率较高。

The characteristic vector of the real symmetric matrix should be found out, which is orthogonalized and normalized to a standard orthogonal base and is used as row vector to construct the transformation matrix P, so the P~(-1)AP can be made into diagonal matrix.

实对称矩阵A经相似变换P-1AP可化为对角矩阵，在x =Py 下，不一定能化A的二次型为标准型；应寻求对称矩阵A的特征向量，将其正交化并单位化作为标准正交基，作为列向量构造变换矩阵P，可使P-1AP=Λ为对角阵，在x =Py 下，要将二次型化为标准型，且二次项系数即为对角阵Λ主对角线上元素。

MBD1、EDG1 and its hyper methylating modulation may play an important role in the pathogenesis of pancreatic cancer,among which the high expression of MBD1 in pancreatic cancer would be the key modulating point in the down regulation of multiple methylation related suppression genes transcription.

cDNA 微列阵技术为胰腺癌相关基因表达谱的分析提供了有力的工具，MBD1、EDG1等基因过甲基化表达调控可能在胰腺癌发病机制中起着关键作用，而MBD1在胰腺癌中高表达可能是多个甲基化相关抑癌基因转录表达下降的关键调控点。

Quasi-near field spots with a profile of sharp edge and flat top can be obtained with a diffraction-weakened lens array, while the speckles imposed on the spot by beamlets interference can be smoothed by spectral dispersion.

消衍射型透镜列阵能获得边缘陡峭且顶部较平坦的准近场焦斑，光谱色散平滑则能有效地抹平焦斑内部由多光束干涉引起的细密条纹。

Laser beam micro process ; 355nm UV DPSS Laser ; Telecentric Scan Lenes ; Micro hole array ; Laser drilling probe card guide sheet.

激光精细加工； 355nm紫外固体激光；远心扫描物镜；微孔列阵

Further theoretical analysis demonstrated the lateral effective width of crescent-shaped quantum wires was 6nm within the regime of quantum size. With two-dimensional separated-confinement-heterostructures, the multi-quantum-wire laser arrays operated in pulsed condition (1kHz/1μs) at room temperature, and their pulse light outpower reached more than 115mW, which is the best among all quantum wire lasers reported previously.

这种多量子线激光器列阵具有二维分别限制的异质结构，并在室温脉冲（重复频率1kHz，脉宽1μs）下产生激射，光脉冲线性输出功率可达115mW以上，这是目前国际上各类量子线激光器的最好水平；子带间能隙最大为27meV，与室温下热离化能相当，优于目前国际上报道的同类量子线激光器的最好水平。

The availability of detailed acoustic array measurements on the same turbines provides a unique possibility to assess the predictions not only in terms of source spectra and overall sound levels, but also in terms of the noise source distribution in the rotor plane as a function of frequency and observer position.

详细的音响列阵测量的可及性在同样涡轮提供一种独特的可能性估计预言不仅根据来源光谱和整体声音强度，而且根据噪声源发行在电动子飞机作为频率和观察员位置功能。

And there exists optimal values of xd and δ,and SR of the corresponding M×N ChG beams reaches its maximum.

因此，适当选取M、xd和δ可以降低湍流对双曲余弦高斯列阵光束远场光束质量的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。