到差

But the finite difference methods require that computational domain is regular, and usually people construct the difference scheme for one dimension and then extend it to two or three dimensions in a dimension by dimension fashion.

有限差分方法要求计算区域比较规则，而且人们往往是对一维方程构造差分格式，再用分裂方法将其推广到多维。

But the finite difference methods require that the compu-tational domain is regular,and usually people construct the finire differencescheme for one dimension and then extend it to two or three dimensions in adimension by dimension fashion.

但有限差分方法要求计算区域比较规则，而且人们往往是对一维方程构造差分格式，再用分裂方法将其推广到多维。

In the western mining areas, when from adjustment to restriction adjustment, the original national control points are of low grade, or the points are destroyed and the surface movement is out of shape. thus, there are few control points and the reference frame conversion is a big problem in the western high elevation areas. As a result, this thesis makes a reparable design in accordance with the key problems of holing through survey.

本文就利用GPS技术测设地面近井点的网形布设、观测方法、数据处理作了相应阐述；并对由无约束平差到约束平差时，西部地区可能遇到在矿区分布的原有国家控制点往往只有低等级点，或点位遭破坏、地表移动变形等可能使可用控制点很少的情况、以及西部高海拔地区坐标系统变换问题，提出了针对贯通测量的关键问题应对方案。

The inspection and output the file cyclophos phamide on the interpretation of a PDF file for VPS II CTP output 3. i3jCTP plates production code for objective: specification for CTP plates production procedures and quality standards, quality and product quality work program: cyclophos phamide getfor output files must be copied to the specified folder that you want to place and remove the file input, there should be records; II the output printed on a single-file should be set laser and plate parameter cannot be combined with the use of mixed experimental data in order to avoid errors; under normal circumstances, laser and forbidden to modify the plates; and aim at the output before printing are advised to check the status of the appearing machines, there are not enough developer and Replenisher.

文件的查抄与不不输入①差注释后的PDF文件息VPS ②CTP不不输入不一、i3jCTP印版制息表率纲的：表率CTP印版制息步调和量量尺度，包管工息量量和产物格量工息步调：①所给不不输入的文件务必复制到选举文件夹，不得任意安插和简略节略，文件不不输入后，答举行纪录；②不不输入印单文件答撤销兼用激平和版材参数，不克不及与测验考试数据混用，以免爆发不差；在变态环境下，不容编削兼用激平和版材参数；③不不输入印版后，答不后查抄显影机的工息状况，有无不足的显影液和补偿液。

This is a globally optimized algorithm and can derive a rheological parameter estimation, showing superior statistic features including near unbiasedness of fitting residual error and almost least variance.

新算法是一个全局优化算法，所得到的流变参数估计具有拟合残差近似无偏性和方差几乎为最小的特征。

For these important and practical problems,sample covariance matrix is an important statistic because many important statistics are functionals of it.When we make statistical inferences,such as estimations and/or hypothesis tests,the sample covariance matrices must be investigated.

以上诸多方面在做估计和假设检验过程中，无不用到大维随机矩阵的处理，尤其是大维样本协方差矩阵的相关性质，因为多元分析中许多重要的统计量都可以表示成样本协方差矩阵的函数。

Further, considered the considerable uncertainty of current sample variance, a reliability estimation method based on t-distribution theory and empirical logarithmic standard deviation is proposed.

进一步考虑到工程实际中当次可靠性试验的样本方差具有较大不确定性的因素，提出了基于对数标准差经验值的t分布可靠性评估方法。

Effects of dry temperature and dry time on properties of heat cured sand and the relationship with binder composition are as follows:sands bonded by binders that are not modified have high strength when dry temperature is high and dry time is long,but their anti-wettability power is poor . Sands bonded by binders that are modified by B but not modified by M can be dried quickly and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M but not modified by B can also be dried quickly to obtain maximum strength,then the strength becomes lower when they are dried continually for more time. and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M as well as by B at the same time can be dried quickly to obtain maximum strength at low temperature and short time. But the anti-wettability of sand mold is best when they are dried at high temperature and long time.

烘干温度和烘干时间对热硬砂性能的影响及其与粘结剂改性的关系是：未经改性剂B和改性剂M改性的粘结剂砂，脱水速度较慢，烘干温度越高，时间越长，则硬化强度也越高，但未经改性的粘结剂热硬砂的抗吸湿性较差；经改性剂B而不经改性剂M改性的粘结剂热硬砂，烘干硬化速度较快，强度也高，但在高湿度下的抗吸湿性不好；经改性剂M改性而不经改性剂B改性的粘结剂热硬砂，烘干时强度先随烘干时间升高至最大值后，继续烘干时强度又出现下降；经改性剂B和经改性剂M共同改性的粘结剂热硬砂能在短时间和较低的烘干温度下就可烘干到最高强度，即烘干脱水的速度较快，但试样的抗吸湿性差，若在更高温度和更长时间下烘干，试样的抗吸湿性得到改善，综合考虑烘干强度和抗吸湿性要求，对于φ30×30mm试样，理想的烘干温度是200℃，烘干时间20分钟。

The algorithms estimate the DOA of the broadband distributed source fron the secondary diagonal elements of the covariance matrices generated from every frequency domain of the received broadband signal s, thus avoiding unwrapping of phases.

该类算法首先将阵列接收的宽带信号变换到频率域，然后对于每个频率形成阵列接收信号协方差阵，最后由该协方差阵的次对角线元素估计宽带分布源的到达角，其主要特点是避免了相位展开。

This thesis,starting from working out the arrest points and the infl ection points of the function curves of the grey mathema tical model GM(1:1 )and its residual correction model and residual period model, derives the conditions for empliying these grey models to obtain a higher class of accuracy,thus enabling the user to decide which model should be used in the light of the state of given initial sequency data.

从求得灰色数学模型GM(1.1)及其残差指数修正模型和残差周期修正模型函数曲线的驻点与拐点入手，导出使用这些灰色模型取得较高精度的条件，让使用者可依据初始序列数据的态势决定采用哪种数学模型，并且在结果未揭示以前便可大体上估计到拟合精度是否令人满意。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。