最小密度

In this paper, with the least square methodt, he equations of pressure, density and acceleration of gravity with radius are obtained in fitting PREM.

通过运用最小二乘法拟合PREM数据，得到了地球内部压强、密度及重力加速度随半径变化的具体函数关系式。

Based on the chemical equilibrium flow assumption, the electron density at the exit of the nozzle is determined using the minimum free energy rule. A numerical model based on auxiliary difference equation is derived to simulate the plasma in the time domain and the calculating results are compared with that using Z transform.

以化学平衡流动为前提，采用最小自由能方法确定火箭发动机喷口处的电子密度；验证了基于辅助差分方程和Z变换方法对羽流电磁特性进行时域建模的正确性。

Over three quarters of the land is devoted to agricultural management and almost 40 per cent of the county, including the Chiltern Hills, the Cotswolds and the North Wessex Downs, is designated as an 'Area of Outstanding Natural Beauty' or an ' Area of High Landscape Value '.

在英国东南部地区中，牛津郡是人口密度最小的郡城。超过四分之三的土地被用作农业用途，约为40%的地区被选为"优美自然风景区"和"最佳风景区"，其中包括著名的奇尔特恩丘陵，科茨沃尔德地区与北威塞克斯丘陵。

The correlation between yield and canopy structure indices was the closest during the middle stage of fruiting, then during the latter stage of fruiting, and was the smallest during the seedling stage. It was beneficial to yield formation of summer squash to retain stable and higher canopy height, bigger LAI and lower leaf area density.

产量与结果中期的冠层结构指标相关性最大，其次是结果后期，与苗期相关性最小，结果期维持较高较稳的冠层高度、叶面积指数(leaf area index ，LAI)，较低的叶面积密度，有利于西葫芦产量的形成。

So, the aromaticity of acenaphthenyl groups in C_2 gum should be the least. In order to explain the reason, quantum chemical calculation is utilized. The optimized geometrical structrures of condensed aromatics in C_1 gum, C_2 gum and C_3 gum are calculated at B3LYP/6-31G* levels. We find that some phenyl groups in acenaphthenyl groups are coplanar and have the largest conjugated structure.

为了解释其原因，我们利用量子力学方法进行了计算，研究了三种稠环基团在B3LYP／6-31G*基组水平下优化得到的几何结构，发现苊式多苯基苯基中的萘环和中间的苯环共面，电子离域性最大，而其他二者所有苯环都不共面，发生了明显地扭曲；同时，在优化几何结构的基础上，对三种化合物进行了前线分子轨道的分析，利用密度泛函理论方法(density function theory，DFT)计算了稠环基团的最高占有轨道和最低未占轨道之间的能量差，即能隙，发现C_2胶上苊式多苯基苯基的Eg最小，解释了C_2胶具有最好的辐射保护效果的原因。

As for advanced boiling water reactors, the minimum critical power ratio should not exceed 1.07; the maximum linear power density should not cause more than 1 percent of plastic deformation to fuel claddings.

对于先进型沸水堆，最小临界功率比不超过1.07；最大线功率密度不使燃料包壳产生大于1%的塑性变形。

The Smithsonian's Robert Noyes told a news conference,"The planet is the largest planet that has ever been seen, inside our solar system or out, and it's the least dense planet."

史密森尼的罗伯特·诺伊斯在一个新闻发布会上说，&无论在太阳系内还是太阳系外，这颗行星都是我们见过的最大的，也是密度最小的行星。&

The Smithsonian's Robert Noyes told a news conference,"The planet is the largest planet that has ever been seen, inside our solar system or out, and it's the least dense planet."

史密森协会的罗伯特·诺伊斯在新闻发布会上说：&这颗行星是我们在太阳系内外所发现的所有行星中最大的，同时也是密度最小的行星。&

The Smithsonian's Robert Noyes told a news conference ,"The planet is the largest planet that has ever been seen, inside our solar system or out, and it's the least dense planet."

史密森尼学会的 RN 在一个新闻发布会上谈到：这是迄今为止所发现的最大的行星，不论在太阳系内还是外太阳系外，也是密度最小的行星。

The Smithsonian's Robert Noyes told a news conference ,"The planet is the largest planet that has ever been seen , inside our solar system or out, and it ' s the least dense planet."

史密森研究所的 Robert Noyes 召开了一个记者会，这个行星是目前宇宙中最大的行星，它是密度最小的行星。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷