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The finite-difference method of calculation on primary wave traveltime based on any rectangular grid and a local plane wavefront approximation has high precision and can apply to complex media with violent velocity variation.

基于任意矩形网格和局部平面波前近似的有限差分初至波走时计算方法精度较高并适用于强纵横向变速的复杂介质。

In this thesis, the barotropic primitive equation under the rectangular coordinate system and atmospheric circulation equation under p coordinate system are.

从正压原始方程开始，运用分层理论研究大气环流方程组定解问题的适定性，以及适定的定解问题(包括初值问题、边值问题和混合问题)在解析函数类空间准确解的求解方法。

By studying the present calculating formula of rectangular drawpiece blank size, this paper gains the major reason of inducting error,and obtains new more accurate formula,according to the same principal that surface area is equal before and after drawing.

对现有盒形拉深件坯料尺寸计算公式进行了分析，得出其误差存在的原因，并根据"坯料面积与拉深件面积相等"的原则得出了较为准确的盒形拉深件坯料尺寸计算新公式。

First the subject discussed on the prerequisite of the Auto end-lock's structure, the changing mode and the agglutinate angles of Auto end-lock carton, then it analyzed five types of Auto end-lock carton's structure: rectangular parallelepiped, vertical rectangle-terrace, prismoid, non-conventional prism and non-conventional type.

此外， 项目还讨论自锁底折叠盒的盒形情况，变化方法，粘合角度和粘合余角，分析研究五种类型的自锁底折叠盒的结构，他们是矩形平行六面体、梯形、平截头棱椎体、不规则类型。

First fitting the projective straight line in three rectangular coordinate system,second obtaining the straight line equation in space through the projective straight line,and comparing three different straight line equations,finally choosing the best fitting program.

先拟合三个直角坐标系中的投影直线，再通过投影直线求出空间直线方程，并对拟合出来的三个不同的直线方程进行比较，选择最佳拟合方案。

To allocate apples, washed, cut into a similar one, in the middle of the plate put into a rectangular shape.

再拿出苹果，洗干净后，同样切成一片一片的，在盘子的中间摆成了一个长方形。

The municipal government has, based on the plan, actively carried out an integrated urban land improvement project called Urban Land Consolidation since 1958, by which the irregularly shaped and uneconomically used small land parcels before consolidation have been put into rectangular shape and a...

自 195 8年开始，台湾地区有计划地推行综合城市土地开发措施———市地重划，将一定范围内不符合经济使用的城市土地重新规划调整，使之在无需政府财政支出的情况下完成了各项公共设施的建设，有效地改善了城市环境及产业布局

The concept of exponential transformations of rectangular Cartesiancoordinates is introduced, showing that a plane curve is more frequently expressed by a unionof four or fewer quadrantal equations defined uniquely in the respective quadrants whichthe curve covers and are therefore quadrant invariant, then the Fermat curve s with someof their geometric properties are formulated.

引入直角笛卡儿坐标幂变换的概念，说明一平面曲线是较经常地用4个或更少的象限方程的并集来表示的；这些象限方程是在曲线所在的各个象限中惟一定义的，因而是象限不变的。然后列出费马曲线的方程，并简述了费马曲线的一些几何性质

A quadrupole electric field driven by a rectangular wave voltage can be used for mass selective storage and analysis.

矩形波驱动的四极场同样可用于对离子进行质量分析和存储。

According to the theory results,the two orthogonal polarized states of the fundamental mode become non-degenerate in this fiber and modal fields are quasi rectangular with appearing strongly linear polarization.And,the birefringence of the fiber was found to be due to the asymmetry of cladding structure.If the rate η between lognitudinal and transverse holes-spacing is reduced,the birefringence will increase strongly.

结果发现，矩形点阵微结构聚合物光纤基模两个正交偏振态不再简并，模场呈现类矩形且具有较强的线偏振特性；该光纤模式双折射产生于包层孔结构分布的不对称性，减小包层纵向孔间隔和横向孔间隔之比η值，双折射明显增强，适当调节η，可在更宽频带范围内实现高双折射单模运行。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。