一个高效的预条件子是来自多重网格刚度矩阵。
An efficient preconditioner is derived from the multigrid stiffness matrix.
文中采用了几种预条件技术来降低算子方程的条件数。
Several preconditioning techniques have been used to reduce the condition number of the operator equations.
同时，还可使用迭代的预条件双共轭梯度算法进行计算。
An iterative conjugate gradient algorithm is used in all cases.
首先将有理函数阻抗矩阵插值技术应用于采用预条件器加速的矩量法求解过程。
Firstly, impedance matrix interpolation is incorporated in MoM in combination with the preconditioning technique.
本文引入预条件共轭梯度法，提出了结合频域有限差分法结合分析二维柱体的电磁散射问题。
The finite-difference frequency-domain method with preconditioned conjugate-gradient technique is presented for two-dimensional cylinder scattering problems.
把不完全乔里斯基预条件技术应用到其积分方程，极大地改善了其谱特性，加速了矩阵方程的迭代收敛。
The IC precondition technique is applied to the integral equation to improve the spectral properties and accelerate the iteration speed of matrix equation.
本文还研究了几种预条件技术，用于改善算子的条件数，进一步加速迭代，同时用数值结果对比了各自的优劣。
Some preconditioner technique is also studied to improve the condition number and further accelerate iterations, comparisons are made between them by numerical results.
为了克服这一困难，本文通过引进一个仿射变换矩阵，构造仿射投影既约预条件共轭梯度路径来搜索获得迭代方向。
In order to overcome the difficulties, we introduce an affine scaling matrix, and form the affine scaling reduced preconditional conjugate gradient path to obtain a new accepted step.
两个典型算例的理论分析和实际计算表明，这种预条件方法可以降低方程的迭代次数约30%，明显减少方程求解时间。
The theoretical analysis and numerical results of two typical examples show that this method can decrease the numbers of iterative by30%and reduce the computation time greatly.
在构造预条件因子时，采用从目标的“几何结构剖分”出发，而不是从“矩阵元素”出发确定“基权函数之间的作用量关系”，这样保证了构造预条件矩阵的计算复杂度仅为O（N）。
The preconditioner is generated from the target's "geometry structure " and not from the "matrix element", which assured the computational complexity for generating the preconditioner is only O(N) .
考察了聚合反应条件，如溶剂种类、聚合温度、模板浓度、引发剂用量、转速、预聚合时间等对分子印迹聚合物微球特性的影响。
The effects of reaction conditions were studied, including the kind of solvent, polymerization temperature, the concentration of template and initiator, rotational speed and pre-polymerization time.
预镀的条件每个车间差别很大。
对预柱吸附法捕集鲜花头香的条件进行了讨论。
The conditions of trapping of fragrance volatiles have also been discussed.
在石英管原子化器的进口管进行加热预原子化，能抑制形成氢化物元素对铋的干扰，试验了测定铋的各项分析条件。
By heating the intake tube of quartz atomizer the suppression of interferences from hydride forming elements was obtained. Other conditions were also studied for Bi determination.
为获得理想的预硫化效果，必须严格控制各阶段的反应条件。
In order to obtain the ideal presulfiding effect, the conditions of various stages should be controled strictly.
影响冻干角膜效果的因素涉及方方面面，诸如保护剂系统，预冻温度，降温速率，冷冻干燥条件等。
There are a lot of factors that affect the quality, such as protective agent, freezing temperature, freezing rate, freeze - drying conditions.
分别对预聚反应时间、温度进行了考察，确定了合适的反应条件；
The time and temperature of prepolymerization were investigated, and the appropriate reaction conditions were ascertained.
用集合的近似凸性研究函数的预不变凸性，在较弱的假设下获得了预不变凸性的一些等价条件。
Preconvex functions are studied by applying nearly convexity of sets in this paper. Under weaker assumptions, some equivalent conditions for preconvexity are derived.
根据铁水预脱硫反应的热力学函数和脱硫反应速率，分析了有利于铁水预脱硫的条件。
Based on thermodynamic function of hot metal predesulphurizing reaction and desulphurizing reaction rate, the conditions beneficial to hot metal predesulphurization was analyzed.
结果表明，选择适当的软段组分和制备条件，通过半预聚体方式制备三软段聚氨酯弹性体是可行的。
The results showed that PU elastomers with broad glass transition temperature and damping temperature could be prepared with three soft segments by semi-prepolymer method at appropriate conditions.
研究了化学镀锡预镀溶液的组成和工艺条件对镀层厚度和表面形貌的影响。
The effects of the composition and technological conditions of electroless tin preplating bath on the thickness and morphology of the coatings are investigated.
利用WMO推荐的气候异常度指标，确定了气候条件（年景）的定量评价模式、旱涝等级标准及旱涝趋势预评价模式；
The quantitative assessment models of climate conditions were set according to a WMO's criterion of climate abnormal degree.
高速线、棒材热轧生产线的预精轧段和精轧段用轧辊的工作条件十分恶劣。
Working condition of roller rings used in finishing roll sector or pre-finishing roll sector of high speed line or rod rolling mill production line is extremely vile.
对流态化预还原过程中碳吸附条件下赤铁矿粉的物化性质、结构变化规律进行了研究。
The present paper studies the law of changes in the physical and chemical properties and structure of the hematite ore fines under the absorption condition in the process of fluidized pre-reduction.
条件预加载确保所有函数调用时间相同。
Conditional advance loading ensures that all calls to the function take the same amount of time.
安全预评价是一个复杂的技术经济系统工程，其影响因素、关联变量和约束条件复杂。
The safety pre evaluation is a complex technology economic system engineering and it is complex due to influential factors, on relation variables and constraining conditions.
考察了微波消解条件、预还原条件和干扰的影响。
The experimental conditions of microwave digestion, prereduction, and interferences were investigated.
在相同的预氧化时间的条件下，金-瓷结合强度随除气时间延长也呈递减趋势。
When the time of preoxidation was same, the combining intensity of alloy-porcelain decreased with the time prolonging of degassing.
研究了在危险天气条件下，在雷达管制空域下，计算航空器预达时间的问题。
Discussing problems of how to forecast ETA (estimated time of arrival) in given bad weather conditions of an air-space within the reach of monitoring radars.
研究了在危险天气条件下，在雷达管制空域下，计算航空器预达时间的问题。
Discussing problems of how to forecast ETA (estimated time of arrival) in given bad weather conditions of an air-space within the reach of monitoring radars.
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