下凹的

The results show that, when the fuel supply position is located at the forebody of cavity, the jet flow of fuel supply has certain damage to vortex, and when the fuel supply injection is located at the afterbody of cavity, the jet flow of fuel supply has no damage to vortex.

实验表明，供油位置在凹腔前体，油气掺混孔处的射流对涡有破坏，供油位置在凹腔后体，油气掺混孔处射流对涡没有破坏作用，在不考虑供油方式等因素的情况下，凹腔后体供油优于凹腔前体供油。

The experimental results show that for most continuous optimization problems, the strategy of concave function gains an advantage over the linear strategy, while the linear strategy outperforms strategy of convex function with the identical initial and final weights.

试验结果表明，对于多数连续优化问题，在初始权值和最终权值相同的情况下，凹函数递减策略优于线性策略，而线性策略优于凸函数策略，凹函数递减策略能够在不影响收敛精度的情况下较大幅度地提高粒子群算法的收敛速度。

3When mark price increase, the advertising cost, the optimal order and the lower bound of total profits increase in three cases. In the S shaped function, the advertising cost in three case decreases concave downwards, and in concave shaped function, the advertising cost increases concave upwards.

3当成本加成率m递增时，在三个个案中，广告支出、订购量以及利润下限都向上递增，在S型函数中，三个个案下的广告支出效果为凹面向下，而凹型函数中，广告支出效果则为凹面向上。

Under the same conditions, the mode distortions induced by the tilted mirror are smaller for the plano-concave resonator with the Gaussian-reflectivity, and the relations of the field distributions with Gaussian-reflectivity to the tilt angles are different from those with even-reflectivity.

同等条件下，高斯反射率平凹腔腔镜倾斜对谐振腔引起的模畸变小于均匀反射率平凹腔，且基模光场及本征值随镜倾斜的变化关系稍不同于均匀反射率平凹腔。

The lab findings show, the no-blemish copper deposition can be realized through selective copper deposition in trench. In the process of electro-plating, via and crevice come into being due to the misproportion of the current density inside and outside the trench.

在电镀的条件下，凹槽电镀铜产生空洞和缝隙原因是凹槽内外电流密度分布不均匀，使凹槽内外镀层生长速度不一致，最终导致空洞和缝隙形成。

The accumulation of the ovalization for the first case is much faster for the deeper depth than that for the less shallow depth. However, the change of the width does not influence on the ovalization-curvature curve for the second case.

当在固定凹槽宽度且不同深度的情况下，凹槽越深，成长的速度累积椭圆化量较快，而在固定凹槽深度且不同宽度的情况下，不同宽度对椭圆化的变化并没有太大的影响。

At the same time,three dynamic models of cylinder powder green-preform are set up ,which are :die and corefixed on the die shoe , core moving with green-preform, core and die moving downwardin relation to green-preform. The theoretical equations of the green-preform densities andpressing stresses of the three pressing conditions are also derived.

同时建立了凹模与型芯固定在下模座、型芯随压坯一起运动和型芯与凹模相对于压坯向下运动等三种圆环形粉末压坯压制的力学模型，导出了这三种压制条件下的压坯密度与压制压力的理论公式；其结果能够指导粉末冶金模具设计，为发挥模具材料的潜力提供依据。

And some are caused because the grinding stone the grain grade is not reasonable or not polished so well.

肉眼看来光洁如镜的花岗石石材的表面，在反光显微镜下和扫描电子显微镜下可以看出石材表面都存在在磨抛加工后所留下的凹坑和条痕，这些凹坑和条痕有的是在目前的加工条件下无法克服的由矿物本身的缺陷而造成的，有的则是因为在加工过程中由于磨石粗细等级不合理或磨抛不彻底所造成的。

It is composed of heater, sealing rubber rings, induction coil for heating, and high-power electronic device.

其结构包括加热器、橡胶密封圈、加热感应线圈、大功率电子元件，其中的加热器由非金属材料制作的基座、上盖、铁磁片、进水口、出水口组成，大功率电子元件是安装在进水口上，该大功率电子元件和进水口之间是互相绝缘的，基座的上、下端上有出水口、进水口，基座中间有凹槽，铁磁片放入该凹槽的底部，凹槽底部和进水口及出水口相连通，凹槽口上有上盖，基座和上盖之间有橡胶密封圈，基座的另一面上安放加热感应线圈，加热感应线圈和基座中的铁磁片相对应。

In this study, a commercial CAD/CAM Software is used to plan and generate the multi-axis tool path, and a table rotating/tilting type five-axis machining center is used to perform the experimental machining operation. The material of the die studied is NAK 80 die tool steel, and the geometries are modeled as concave and convex spherical surfaces. Milling parameters considered are spindle speed, feed rate, and different types of cutting tool path. The experimental results show that the surface roughness for concave spherical surface is about 0.247 μm and roundness is about 0.0283 mm and the surface roughness for convex spherical surface is about 0.250 μm and spherical roundness is about 0.0551 mm under the cutting conditions mentioned in this study.

本研究的实验方法与步骤包括利用商用CAD/CAM系统针对实验对象规划三轴/五轴同动加工路径，并经后处理程式转换，在本实验室之平台倾斜/旋转型之五轴加工机上进行实验，实验对象为NAK80模具钢材料之凹与凸球形曲面之加工，此外考虑的切削条件有主轴转速、进给速度、加工路径等，在本研究所设定之最佳切削条件下，凹球形曲面之真圆度约为0.0283 mm，粗糙度为0.247 μm，而在相同切削条件下，凸球形曲面之真圆度为0.0551 mm，粗糙度为0.250 μm。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。