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In order to design lighter and faster hydraulic excavator, a rigid-flexible hybrid modeling method based on rigid multi-body dynamics and finite element method was put forward to study the dynamic characteristic of hydraulic excavator in its whole working cycle. The working equipment with characteristic of time-varying structure was taken as research object, and radial acceleration was computed as tags of key load.

为适应液压挖掘机高速、轻量化的要求，以具有时变固频特性的液压挖掘机工作装置为研究对象，提出了以角加速度判断时变结构的关键工况，利用刚性多体动力学和有限元方法对液压挖掘机在整个作业循环中的动力学特性进行建模和分析。

In this paper the phase shifts in spiral galaxies M 81 and M 51 has been computed. It is found that the theoretical patterns of the spiral arms agree in general with the observational results of 21 cm radio emission in the main.

本文具体计算了M81，M51两星系的恒星臂与气体臂之间的相移，给出了两星系的星臂乃气臂的式样，与21厘米射电观测结果比较表明，理论与观测基本上是符合的。

Objective To evaluate the application value of computed radiography in the diagnosis of silicosis.

目的 探讨计算机X线摄影在肺尘埃沉着症诊断中的应用价值。

CT has a great value in the observation of normal pericardium and pericardial disease. Pericardium ; Tomography, X-ray computed ; Radiometry

0例心包病变者，男 15例，女 5例，年龄 30～ 89岁，平均 5 5 。6岁，所有病例均由CT扫描作出诊断，并经心包穿刺细胞学和手术病理证实，其中心包积液 11例，缩窄性心包炎 6例，心包转

Objective To investigate the differential diagnosis value of 1H magnetic resonance spectroscopy (1H-MRS) and (superscript 99m)Tc-methoxy isobutyl isonitrile single photon emission computed tomography on postradiotherapy relapse and radionecrosis. Methods 1H-MRS and SPECT were performed in all 35 cases.

目的 探讨质子磁共振波谱(1H-MRS)和99mTc-甲氧基异丁基异腈单光子发射计算机断层显像对脑肿瘤患者放疗后复发与放射性坏死的鉴别诊断作用。

X-ray radiography, X-ray radioscopy and X-ray computed tomography were performed to the C preforms and C/SiC composites made by chemical vapor infiltration method. Elementary research of the simulation of X-ray nondestructive testing of C preforms and C/SiC composites was conducted. The main contents and conclusions are summarized as follows:(1) The equivalent absorption coefficients of graphite and SiC to Al (KAl/sic, KAI/C) were measured. It was found that in 35-45KV, KAl/sic=1.1~1.2 and KAl/c=0.08~0.12. That means X-ray radiography was much less sensitive to fiber defects than to SiC matrix. It was suggested that Al Image Quality Indicator would be used to evaluate the quality of X-ray radiographs of C/SiC.

本文选择X射线照相、X射线实时成像和X射线CT等三种方法对C纤维预制体及C／SiC复合材料进行了检测和研究，并对C／SiC复合材料X射线检测的计算机模拟做了初步的探索，主要研究内容和结果如下：(1)测定了C和SiC的X射线照相等效系数，在35～45KV的条件下，Al对SiC的等效系数K_为1.1～1.2，Al对C的等效系数K_为0.08～0.12，所以X照相射线检测C／SiC对C纤维缺陷不敏感，而对SiC基体缺陷敏感。

Print quality indexes, including Overspray, Edge profile raggedness and Roundness deviation, are computed to evaluate the print quality.

系统软件能从放大的打印文件图像中提取量化超范围喷溅、边缘粗糙程度、圆度偏差等多种打印质量特征。

In contrast to conventional optimization algorithms whose iterates are computed and analyzed deterministically, randomized methods rely on stochastic processes and random number/vector generation as part of the algorithm and/or its analysis.

传统的最佳化演算法中迭代的计算和分析是确定的，与之相比，随机方法依靠随机过程和乱数字/向量的生成作为演算法和演算法分析的一部分。

In contrast to conventional optimization algorithms whose iterates are computed and analyzed deterministically, randomized methods rely on stochastic processes and random number/ vector generation as part of the algorithm and/ or its analysis.

传统的最优化算法中迭代的计算和分析是确定的，与之相比，随机方法依靠随机过程和随机数字/量的生成作为算法和法分析的一部分。

After getting online results, combustion expert controller gained relevant ratiocinate output results by integrating technical parameters of online inspected system, combustion computed results and diagnostic and manipulated countermeasure of knowledge base, then which could propose operator for choosing a suitable control method using concentrated corresponding rules.

在得到在线计算结果以后，燃烧专家控制器综合在线检测系统提供的工艺参数，以及燃烧计算的结果，使用存放在知识库中的诊断和操作对策，得到相应的推理输出结果；利用规则集的相应规则，提示操作工选用合适的控制方法。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。