模拟实验

The different solidification process of the die were simulated by using casting software Hua Zhu CAE, the effect of the different pouring temperature, riser position and size on shrinkage and porosity was analyzed, the experiments were done to observe the metallograph and detective the performance of the mold.

使用华铸CAE对不同工艺的凝固过程进行有限元模拟，分析不同的浇注温度以及浇注系统的位置和大小对铸件缩孔、缩松的影响，通过实验观察铸件金相组织，测试实验样品的性能，最终确定优化后的铸造方案。

VBased on the theoretical analysis,thetypical nonconservative problem-Beck'scolumn is simulated by a conservative model,and thus the difficulties in realizing thefollower load under common experimentalconditions are avoided.

在理论分析的基础上，用一个保守模型的振动实验对典型的非保守问题—Beck梁柱进行了模拟，避免了在普通实验条件下实现非保守跟随载荷的困难。

The formula is described as followwith A denoting tidal amplitude and Ov for the groundwater table overheight:Ov = A × [1 -(0.11 ×α+ 1.33)× exp-0.89 ×ε~(0.46]. Laboratory experimentswere also carried out to validate the numerical modeling results.

基于无量纲化后的参量α和ε，以及特殊定义的超高，通过大量的数值实验及回归分析，推导出计算超高的经验公式(A表示潮汐振幅，Ov表示超高)：Ov=A×[1-(0.11×α+1.33)×exp-0.89×ε~(0.46]，并通过物理实验对比分析数值模拟结果。

Objective. 1. There was few researchers who mentioned pericementum which has some effect of resistance to sliding when they studyed the friction of archwire-bracket.

一、研究目的： 1、鉴于目前在测定弓丝与托槽滑动阻力时，均没有考虑到牙周膜对滑动阻力的影响，因此本实验尝试建立一种新的实验模型，分别模拟牙，牙周膜，牙槽骨。

From the experiment discovered for the first time the dimethyl ether may substitute CO to take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and optimized the CH_3OCH_3-NO-HO_2 chemistry amplifying system determination condition, the CH_3OCH_3 best density is 1.876 ppmv, the NO best density is 1.3ppmv, and obtained this method chain length CL=124, 5 parallel determinations densities of HO_2 are the 44.0pptv, the relatively standard deviation is smaller than 4%; Although chemistry box model computed result indicated the dimethyl ether, the ethene, the propene and the ethanol all can take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and their simulation chain length all grows up compared to the CO-NO-HO_2 chemistry amplifying systems, but experiments proved the ethene, the propene and the ethanol have not suit the chain-carrying agents.

首次从实验上发现二甲醚可以替代CO作为过氧自由基化学放大系统的链传递试剂，并优化了CH_3OCH_3-NO-HO_2化学放大系统的测定条件，CH_3OCH_3的最佳浓度是1876ppmv，NO的最佳浓度为1.3ppmv，并得到了这一方法的链反应长度(CL=124)，5次平行测定浓度为44.0pptv的HO_2自由基，相对标准偏差＜4％；虽然化学盒子模式计算结果表明二甲醚、乙烯、丙烯和乙醇都能作为过氧自由基化学放大系统的链传递试剂，并且它们的模拟链长都比CO-NO-HO_2化学放大体系的链长大，但是实验证明乙烯、丙烯和乙醇不适合作为过氧自由基化学放大系统的链传递试剂。

Our theory predicts the minimum value of ponderomotive parameter and the corresponding critical laser intensity, below which no diffraction can occur; 6, We studied the energy transfer of a two-level atom moving in a cavity field, as well as its influence on the atomic emission spectra and on the photon distribution of the intro-cavity field.

我们用两对激光模来模拟紧聚焦的高斯光场，成功地得到了《Nautre》上Batleaan等人的实验观测结果，预言了有待实验进一步观测的新现象，并确立了发生电子衍射的激光场的临界强度； 6，研究了原子在激光场中运动时光场与原子之间的能量交换，以及这种能量在光谱上的反映和对激光场统计性质的影响。

The results of simulation indicated that the new model can be applied toany loading condition, describe phenomena that the Terzaghi consolidation modelcan not, such as the apparent preconsolidation pressures that depend on strain rate, increment in apparent preconsolidation pressures due to creep during sustained loading, and change of porewater pres...

计算与实验结果对比表明，该模型能应用于一维条件下任何加载方式的固结模拟，能描述表观前期固结压力的应变率效应、次固结引起的表观前期固结压力增加、连续加载下超静孔隙水压的增长规律等一些已被实验广泛证实且不能被太沙基固结理论反映的现象。

The difference, relative variation of modular number and mass and their frequency distribution were analyzed between treatments, and within and among structural levels of genet, ramet and tiller in grazing experiment.

在放牧实验中，分别以矮嵩草源株、分株和分蘖层次为单位，对其构件单元的数量和生物量、变异系数、频率分布在处理间的差异和相对变异性进行分析；在模拟放牧实验中，分别就无性系内刈割和未刈割部分从这3个层次上比较了构件数量和生物量在处理间的差异和相对变异性，所得结果如下

Methods Aerobic motionless-culture and anaerobic motionless-culture were carried to Salmonellae by the above cultures.Influence of pH to growth of Salmonellae was observed.Imitate samples were inspected under the best conditions.

方法以5种培养基对沙门菌进行静止需氧培养和静止厌氧培养实验，观察pH对沙门菌生长的影响，并在已选定的最佳条件下进行模拟样品实验。

Results In static phantom studies, the percent error of mean activity obtained by Carson's method was reduced to about 9 %, and it is less than that of image-derived method using maximum likelihood expectation maximization (about 14 %). In simulated dynamic phantom studies, the vessel component could be extracted using ICA in image and sinogram domain. In sinogram domain, the six components extracted by ICA could be obtained quickly.

在静态物理假体实验结果来看，使用Carson's method计算出感兴趣区域活性的百分比误差( 9%)比直接从影像取得活性的百分比误差( 14%)来得小；从数位模拟动态假体实验结果来看，独立成份分析法运用在影像空间或是弦波图空间上，都可以将血管分离出来，但从弦波图空间上得到各个独立成份相对於影像空间就快得多；imageICA和sinogramICA计算出的输入函数的标准化均方根误差分别是0.57和0.28。

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％。