结果表明：经金属型铸造的铜合金密度达到理论密度的99 91%。
The results show that the copper alloy density by permanent-mold casting attains 99.91% of theory density.
从理论上揭示了复合材料的浸渍-裂解周期与材料的理论密度和理论孔隙率之间的关系。
The relationships between the theoretical density and porosity of the composites and the repetition cycle are discovered.
经过轧制的钨板具有很高的密度，变形率达到50%以上的钨板的密度基本上接近理论密度。
Rolled molybdenum plate has a high density, even close to its theoretic value when the deformation rate is higher than 50%.
结果显示涂层的厚度可达15 0微米以上，密度为理论密度的99%，纯度可达99.9%。
The films thickness is 150um. The purity 99.9%. The density 99%td.
结果表明，用本工艺制取的钨-铜触头具有接近理论密度的高密度、优异的物理机械性能和抗电蚀性。
The results show that the W-Cu contact produced possesses high density, excellent physical and mechanical properties and arc-erosion resistance.
最后给出了激光烧结上述金属粉末制造齿轮的加工实例，其致密度达理论密度的82%，而横向尺寸误差仅为1.9%。
A case study on SLS of this Cu-based metal powder to fabricate a gear is carried out. 82% relative theoretical density and transverse dimension error of 1.9% are achieved.
另一种理论是，板块下沉部分的密度大于周围较热的地幔，将板块的其余部分拉在后面。
An alternative theory is that the sinking part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it.
例如，该理论预测了均匀且各向同性时空的最大密度，而这可能隐含了黑洞形成过程的某些信息。
For instance, the theory predicts a maximum density of homogeneous and isotropic space-time, which could have implications for black hole formation.
选择性附加理论写出它的高气体密度在早期太阳系，在行星的形成。
The selective accretion theory chalks it up to high gas density in the early solar system, during the planet's formation.
由于这个特征，修正后的理论在像在非常早期的宇宙或黑洞等高密度区域中的表现尤为明显。
Due to this characteristic, the revised theory has implications especially for high-density regions, such as in the very early Universe or within a black hole.
这就解释了为什么热带地区的生物总是聚集在一起，密度很大，但是这一理论并不能站住脚。
This could explain why large numbers of species are packed together in the tropics, but it doesn't seem to hold consistently.
通过仔细的理论分析，可以推导出如气体密度、温度和压力等各种物理参量，以及紫外辐射和电离辐射的流量。
With a careful theoretical analysis various physical parameters such as the gas density, temperature, and pressure, and the ultraviolet and ionizing radiation fluxes can be derived .
利用量子力学中的密度矩阵算符理论导出了该系统中三次谐波产生的解析表达式。
An analytic representation for the third-harmonic generation along the well is derived by the density matrix operator theory of the quantum mechanics.
提出了一种基于密度的孤立点因子算法和一种基于粗集理论的属性类别差异数据归约算法。
The Out-lier algorithm based on density and attribution classical discrepant data protocol algorithm based on rough set theory were presented.
继而从发电机理论得到了电离层电位及层电流密度在北半球的分布和变化。
Furthermore the distribution and variation of the electrostatic potential and layer ionospheric current density at the northern hemisphere are calculated by the dynamo theory.
结果表明，存在着驱动电流的密度窗口，即仅在一定的等离子体密度范围内才能驱动电流(通常在理论和实验上仅注意到驱动电流的密度上限)。
The results show that there exists a density window for lower hybrid wave current drive (LHCD), i. e, LHCD would be achieved only within a certain range of plasma density.
讨论了各种靶激光等离子体的电子温度、密度及离化态分布的特点并与理论计算的结果进行了初步的比较。
The ionization state distributions of different targets are also discussed and compared with the theoretical calculated results for a simple model.
通过本文的研究既检验了林窗动态模型又印证了林分密度效应理论。
This not only tested the forest dynamics model but also verified the theory of stand density effect.
最后，预测了高密度C3N4异构体的理论硬度。
Finally, the theoretical hardness of high-density C3N4 polymorphs is predicted.
理论上认为，储层含气使声波时差孔隙度和密度孔隙度增大，使中子孔隙度减少。
It is theoretically considered that reservoir gas-bearing makes interval transit time porosity and density porosity increase and neutron porosity decrease.
简要介绍了量子化学中的密度泛函理论。
Density functional theory (DFT) of quantum chemistry was briefly introduced.
本文采用密度泛函理论来模拟吸收谱。
Density function theory (DFT) is employed to simulate the absorption spectrum.
用密度泛函理论方法研究了过亚硝酸在水溶液中的异构化反应机理。
The isomerization mechanism of peroxynitrous acid (ONOOH) in the aqueous solution has been studied by using density function theory.
通过对反向电流各种输运机制的分析，提出了一种计算反向电流密度的理论模型。
A theoretical model used in calculating the reverse current density is proposed by considering several current transport mechanisms.
用密度泛函理论(DFT)和从头算方法，对HNO与O自由基反应进行了研究。
The reaction of HNO with o radical was investigated by density functional theory (DFT) and ab initio methods.
本文用密度泛函理论方法系统地研究了稀磁半导体材料。
First-principles methods based upon density functional theory are performed for diluted magnetic semiconductor.
反应能量主要采用原子团加和方法以及密度泛函理论进行估算。
Reaction energy was always estimated by Group additivity method and density functional theory.
综述了密度泛函理论及其数值方法的最新进展。
Recent progress in density functional theory (DFT) and its numerical methods is briefly reviewed.
通常情况下，线性缩放密度泛函理论的应用还是很少的，而密度泛函理论只能计算成百、成千的原子电子结构。
In general though, linear scaling DFT is still quite rare and DFT calculations on a routine basis typically involve a few hundreds or thousands of atoms.
通常情况下，线性缩放密度泛函理论的应用还是很少的，而密度泛函理论只能计算成百、成千的原子电子结构。
In general though, linear scaling DFT is still quite rare and DFT calculations on a routine basis typically involve a few hundreds or thousands of atoms.
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