查询词典 helical motion

We performed a simulative test, which confirms that wavelet analysis can separate annual wobble and Chandler wobble. Our results show that this method can be used in astronomical geodynamies effectively. This paper is divided into two parts. The first is about statistic characteristic of polar motion. Polar motion includes secular motion, long period fluctuations, Chandler wobble, annual wobble and high frequency wobble. The secular motion is 3.4mas/year and towards 760W meridian. Long period fluctuations have difference periods in x-axis and y-axis. They are 31.7-year and 24-year in x-axis and 28.5-year and 22.9-year in y-axis. These 2~? decades fluctuations have an amplitude of about 30 mas , and are very nearly linearly polarized, with the observed motion of pole being almost entirely along a line between 360E and 1440W. There is a 55.4-year wobble whose amplitude is 9 mas. The amplitude of the interannual fluctuations is about 4? mas. The amplitude of long period fluctuations decreased after 1970. The annual wobble is a steady wobble. It retrograde wobble is only 1/20 of prograde wobble in amplitude.

本文的工作主要分为两部分：第一部分是通过分析POLE97序列，我们对极移的统计特性有了一个较全面的认识，极移主要包括趋势项、长周期项、Chandler项、周年项和高频项：趋势项的方向是西经76°，速度为每年3.4mas；长周期项中Markowitz 项在X、Y两个方向有不同的周期，它们分别是：X方向的两个周期是31.7年和24 年，Y方向的两个周期为28.5年和22.9年它们叠加在一起是一个线偏振运动，最大振幅约为30mas，偏振方向在西经144°和东经36°之间；极移的长周期波动中还存在一个 55.4年周期的圆周运动，振幅约为9mas；十年尺度变化的振幅在4～6mas之间，在Y 方向十年尺度的成份比较多，它们的周期在X方向和Y方向不是对应的；从七十年代年开始长周期变化的振幅明显降低；周年项是一个振幅稳定的摆动，在X、Y两个方向的振幅略有差别，逆向运动振幅大约为顺向运动振幅的1/20；Chandler摆动的振幅自1900年以来经历了几次较大的变化，其中包括1915年和1955年两次极大值，振幅分别达到0&。25和0&。28，以及1925～1940期间小于0.09的过程，Chandler项在X、Y 两个方向的振幅几乎完全相等，其逆向运动振幅不到顺向运动振幅的1/50。

ABSTRACT In this paper, an investigation on the helical ports was carried out in a steady-flow rig. The three velocity Components of air flow through the intake valve of several typical helical ports were measured by hot-wire anemometry for analysing the relationships between intake port geometry and swirl level as well as flow resistance.

本文在稳流气道试验台上对螺旋进气道进行了大量的研究，为了分析螺旋进气道的结构形状与涡流强度及流动阻力的关系，采用热线风速仪测量并分析了不同气道的气门口气体流速。

Based on the involute's basic principles and theoretical formulas, input the involute's formulas of cartesian coordinates into the equation editor, accordingly create the precise involute of gear's contour. Based on the formula of helical gear's parameters, accurately create a curve of tooth profile. Create the chraceristics of helical gear by ordering of swept blend and array.

依据渐开线生成的基本原理和理论公式，在方程编辑器中输入渐开线的笛卡尔坐标方程，从而生成精确的齿轮轮廓渐开线；根据角变位斜齿轮各参数的计算公式，精确创建了齿廓曲线；利用扫描混合和阵列命令创建斜齿轮的轮齿特征。

Objective: To study the helical CT features of constrictive pericarditis and evaluate the diagnostic importance of helical CT.

目的：分析缩窄性心包炎螺旋CT表现特点，评价螺旋CT诊断价值。

Powder metallurgy gears include: bevel gear, dual-gear, gear box gears, planetary gears, ring gear, rack, sector gears, bevel gears, spur gears, sun gear, helical gear, gear shaft, flat gears, spur gears, double layer gear, synchronous pulley, helical gear, sprocket, ratchet, multi-gears, micro-gear, small modulus gear, special gear, differential bevel gear, reducer gears, variable speed gear motor, all kinds of precision gears.

粉末冶金齿轮包括：伞齿轮、双联齿轮、齿轮箱齿轮、行星齿轮、齿圈、齿条、扇形齿轮、锥齿轮、直齿轮、太阳齿轮、斜齿轮、齿轴、平齿轮、正齿轮、双层齿轮、同步轮、皮带轮、螺旋齿轮、链轮、棘轮、多层齿轮、微型齿轮、小模数齿轮、异形齿轮、差速伞齿轮、减速机齿轮、变速电机齿轮、各类精密传动齿轮。

For the first time, we identify that the helical structure appeared in an eruptive sinistral filament was left-helical one.

在一个左旋爆发暗条中，我们首次认证了其螺旋结构是左旋的。

0 Under the environment of SolidWorks,and includes contact stress analysis study on joggle models of helical gear and helical gear axis with CosmosWorks.

介绍了在SolidWorks环境下用VisualC++编程实现斜齿轮和斜齿轮轴三维参数化建模的方法，并用CosmosWorks对斜齿轮和斜齿轮轴的啮合模型作接触应力分析研究。

The molecular weight of broad bean vicilin and legumin measured by gel filtration chromatography were 135000 and 351000, DSC showed that their denature temperatures were 72℃ and 87℃ respectively. The legumin had a lowest solubility at pH 4. 5-5. 0 whereas the vicilin at pH5. 5. Vicilin and legumin were all possessed low levels of α-helical and high β-sheet secondary structure fractions. The total content of α-helical,β-sheet and β-turn fraction of vicilin and legumin reached to 90% and 78% separately showed that they had a high ordered structure in solution.

对两种组分的凝胶层析表明7S和11S的相对分子质量分别为135000和351000；DSC分析显示其热变性温度分别为72℃和87℃；溶解度分析表明：11S球蛋白在pH4.5-5.0之间，7S球蛋白在pH5.5时具有最低的溶解度；圆二色性分析结果显示7S和11S球蛋白的β-折叠结构含量分别高达40.5％和38.1％，证明二者都属于β-折叠型蛋白质，二者的α-螺旋、β-折叠和β-转角结构的含量总和分别达到了90％和78％，从而说明它们在溶液中的结构是高度有序的。

Using numerical simulation method, the variation of magnetic field-strength along the axis of helical current with the helical pitch and position is analysed in detail.

应用数值模拟的方法，细致地分析了螺旋线电流轴线上磁场随螺距和位置的变化关系。

Sandy uroliths' in bladder and sigmoid flexure were clearly diagnosed with helical CT. At the same time, the location, size and shape of sandy urinary stones were satisfactorily found with intravenous X-ray radiology, B-mode ultrasonogram and helical CT. These results showed combined three methods in clinics were a fast precise methods to diagnose urolithiasis.

因此B超、螺旋CT和X射线腹部平片不仅对饲喂棉饼诱发的山羊砂石样结石有明确的诊断，而且可以方便地观察到结石的位置、大小、形态，三者的结合有利于对山羊砂石淋的快速、准确诊断。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？