硬

At the same time, we are deeply aware that development is the fundamental principle and stability is the fundamental goal. Without stability, we will get nowhere and may even fritter away our past achievements.

同时，我们深刻认识到发展是硬道理，稳定是硬任务；没有稳定，什么事情也办不成，已经取得的成果也会失去。

Author develop ELID grinding technology system, on MM7120A surface grinder and fulfilled a lots of ELID ultraprecision mirror grinding for kinds of hard and brittle materials. To use this method, the surface roughness of mechined materials can reach nanometer gade (Ra0.006～0.010 μm), and can replace parts of grind and polish technology.

本文作者开发了在MM7120A平面磨床上的ELID磨削工艺系统，实现了对多种硬脆材料的ELID精密镜面磨削试验，工件表面粗糙度可达nm级（Ra0.006-0.010μm），可取代部分硬脆材料的研磨、抛光工艺。

In this paper, by using the method of expanding the hard-edge aperture function into a finite sum of complex Gaussian functions, the recurrence propagation expression for the propagation of partially coherent beams through a multiple apertured ABCD optical system is derived, which provides a fast algorithm for simulating the propagation of partially coherent beams through hard-aperture optics.

用有限个复高斯函数之和来逼近硬边光阑窗函数的方法，推导出了部分相干光通过多个硬边光阑ABCD光学系统传输的递推公式，提供了一种模拟部分相干光通过硬边光学系统传输的快速算法。

In order to study the propagation of partially coherent modified Bessel-Gaussian beams passing through a paraxial ABCD optical system with hard-edge aperture,the approximate analytical propagation equation was derived with the hard-edged aperture function expanded into a finite sum of complex Gaussian functions.

为了对部分相干修正贝塞尔－高斯光束通过有硬边光阑近轴4BCD光学系统的传输进行研究，采用将硬边光阑窗口函数展开为有限个复高斯函数之和的方法，得到了近似的解析传输公式。

Using the relations between Hermite and Laguerre-Gaussian modes and expanding the window function of two-dimensional rectangular hard-edged apertures into a finite sum of complex Gaussian functions, the propagation of complex- argument Laguerre-Gaussian beams through a paraxial optical ABCD system with a rectangular hard-edged aperture is studied. An analytical propagation equation is derived and used to study the diffraction at the rectangular hard-edged aperture and the focusing properties of complex-argument LG beams.

利用拉盖尔－高斯模和厄米－高斯模的变换公式，并使用将二维矩孔光阑窗口函数展开为有限个复高斯函数之和的方法，得到了复宗量拉盖尔－高斯光束通过含矩形硬边光阑近轴ABCD光学系统的变换的解析传输公式，并对复宗量LG光束通过矩形硬边光阑的衍射和聚焦特性进行了研究。

For reducing boundary distortion area, the elevations of grid DEM are viewed as a discrete sequence under a generalized coordinate, so that the boundary problem of two-dimensional discrete wavelet transform is turned into the boundary problem of one-dimensional discrete wavelet transform, which not only greatly reduces the boundary distortion area, improves the precision of reconstructed DEM data near the boundary, but also decreases the number of zeros adding on the boundary for wavelet transform, and boosts the compression ratio. On the basis of analyzing the distribution characteristics of coefficients in low and high frequency bands, a mixed entropy coding plan is applied, and a high efficient quantizator called"self-adaptive hard threshold"is established, which is helpful for improving the precision of the reconstructed DEM data and for enhancing compression ratio.

为了减小小波变换山区格网DEM数据压缩中边界失真区域，将山区格网DEM高程值视为广义坐标下的离散随机序列，把二维离散小波变换中的边界问题转换为一维离散小波变换中的边界问题，不仅大大减少了小波变换边界失真区域，提高了重构DEM数据边界点的精度，而且减少了边界补零个数，提高了压缩比；通过对山区格网DEM数据小波变换低频区和高频区变换系数分布特点的分析，采取了霍夫曼—游程混合熵编码方案，设计了高效、低失真的"自适应硬阈值"量化器，即对低频区变换系数不进行量化，直接进行霍夫曼编码；对高频区变换系数则先用"自适应硬阈值"方法量化处理，再进行游程编码。

We describethe efficacy and adverse events associated with a modified epiduralneedle versus a conventional Tuohy needle for CSE. One-hundredparturients requesting labor analgesia were randomizedinto 2 groups: 50—ES 18-gauge modified epidural needlewith 27-gauge Pencan atraumatic spinal needle, 50—conventional18-gauge Tuohy needle with 27-gauge Gertie Marx atraumatic spinalneedle.

我们比较了改良的硬膜外针和传统的 Tuohy 针用於 CSE 的效果和不良事件。100名临产要求行无痛分娩的产妇随机分为2组：50名用 ES 18号改良硬膜外穿刺针复合27号 Pencan 防损伤腰麻针，50名用传统的18号 Tuohy 针复合27号 Gertie Marx 防损伤腰麻针。

If the greedy little Gradgrinds grasped at more than this, what was it for good gracious goodness 's sake, that the greedy little Gradgrinds grasped at?

如果这些贪得无厌的小葛擂硬掌握得比这些更多的话，那么，老天爷呀，这些贪得无厌的小葛擂硬所掌握的又是些什么东西呢？

ZM Series exploding isolation protable cola eletrical drill used for mining is applicable to coal mine where has explosive gas and coal dust,used to drill holes in half-hard and hard coal bed when digging .

ZM系列矿用隔爆领手持式煤电钻适用于具有镁尘爆炸性气体混合物的煤矿井下，在采掘工作面对中硬和硬煤层钻眼之用。

Initially called "hard song", that is, no musical instruments, sitting hard to sing, the latter were gradually developed into a snare drum pedal, hand-held bamboo, made to sing fluently.

最初称其为"硬歌"，即无乐器，坐着硬唱，后逐渐发展为一人脚踏小鼓，手持竹板，顺口编唱。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。