临界密度

作为实例，考察了用线性啁啾激光打靶条件下，包含nc/4（nc为等离子体临界密度）的非均匀等离子体区域中的受激拉曼散射的演化，并用时频分布技术得到了清晰的物理图像。

As an example , the stimulated Raman scattering for linear chirped pump laser in near 1 / 4 critical density of inhomogeneous plasma is investigated and a clear picture of the physical process is obtained by time frequency distribution technique .

受激拉曼散射（stimulatedRamanscattering，SRS）是一个大振幅激光光波衰变为一个散射光波和一个电子等离子体波的三波共振过程，它发生在四分之一等离子体临界密度面以下。

Stimulated Raman scattering ( SRS ) is a three-wave parametric process in which an incident light decays into a scattered light and a plasma wave . It happens under the quarter critical density region of plasmas .

超短超强激光与等离子体相互作用过程中，在临界密度面附近产生能量很高的超热电子，当其能量超过靶后冷物质K壳层的电离能时，就会激发冷物质的Kα特征线。

During the interaction of ultra-short and ultra-intense laser pulse with plasmas , high energy electrons will be produced near to critical-density surface . When the hot electrons knocked out inner-shell electrons of the cold material , K α characteristic lines emission will be created .

根据这些辐射与等离子体密度的关系，HL-1装置的放电可分为4种类型，并得到两个临界密度。

In view of the relation between this radiation and the plasma density , discharges in HL-1 can be classified into four types . Two critical values of density are found .

还计算了在M-S势作用下的中子物质出现铁磁相变的临界密度、含有铁磁相变的物态方程及中子星模型。

For neutron matter with M-S interaction , the critical density of the ferromagnetic transition , the equation of state and the neutron star models are calculated .

本文给出非均匀等离子体1/4临界密度面处后向Raman散射的解析解，指出ωo/2谐波解与3ωo/2谐波解间的明显差异。

In this article we obtain the analytical solution of the back Raman scattering from 1 / 4 critical density surface in an inhomogeneous plasma , and point out the marked difference between the solutions of ω 0 / 2 and 3 ω 0 / 2 harmonics .

GCM研究表明，在小于临界密度的情况下，核物质中核子的质量随核物质密度的增大而减小，核子的半径和夸克凝聚随核物质密度的增大而增大。

The calculated results indicate that , before the maximal density is reached , the mass of a nucleon in nuclear matter decreases , the radius of a nucleon and the quark condensate increase very slowly , with the increase of the nuclear matter density .

结果表明：在SkyrmeHartreeFock框架内，同位旋非对称核物质会发生从非极化态到极化态的相变，而且发生相变的临界密度随同位旋非对称度增大而降低。

It is shown within the Skyrme-Hartree-Fock framework that there is the ferromagnetic phase transition in the isospin asymmetric nuclear matter at some density , above which the nuclear matter becomes stable against spin fluctuation , and the critical density for the ferromagnetic transition decreases with increasing the asymmetry parameter .

周期量级超短激光脉冲在近临界密度等离子体中形成的光孤子

Solitons formed by ultrashort laser pulses propagating in a plasma

超临界密度等离子体中快电子束稳定性的研究

Stability Studies for Fast Electron Beams in Dense Plasmas

挠率和宇宙临界密度的修正

Cosmic Critical Density Modified by the Torsion

新的质量标度下奇异夸克物质的电荷与临界密度

Charge Dependence of the Critical Density of Strange Quark Matter in a New Mass Scaling

用对径直线律确定了1-己烯的临界密度。

The critical density of 1-hexene was determined by " the law of rectilinear diameter " .

仿真结果表明，适当的排斥力作用可提高模拟场景的拥堵临界密度。

The results show that the appropriate repulsion can improve the congestion critical density in simulation scenarios .

在种群发展的某一阶段，若组成种群的个体数量超过一定临界密度，就会产生密度&竞争效应。

At a certain stage of population development , the higher the density , the more severe the competition .

通过分析得到临界密度、交通流量以及事故率的一些解析结果。

After analytical study , some exact results about the critical density and the occurrence of car accidents are obtained .

结果显示，前中子星内的中微子束缚使得出现K-凝聚的临界密度推迟到更高的重子密度，而-K0凝聚无法出现。

Our results show that neutrino trapping makes the critical density of K ~ - condensation delay to higher density and ~ 0 condensation not occur .

此外，文中还就种群聚集临界密度进行了探讨。为进行松毛虫种群动态的研究和实施综合管理决策，提供了优化的抽样设计，收到了良好的应用效果。

These provide better sampling designs for the studies of population dynamics and the intergrated management of these insects , and has shown better results in application .

用一维粒子模拟程序研究了超短脉冲强激光与超临界密度等离子体平板作用产生的高次谐波。

Using the one-dimensional particle-in-cell simulation code , we have studied the generation and redshift of harmonics from overcritical plasma layer irradiated by ultrashort intense laser pulses .

激进驾驶车辆和谨慎驾驶车辆的混合比例及它们的刹车概率对混合交通流的临界密度和流量有很大的影响。

The proportion of aggressive drivers amount and careful drivers amount and their deceleration probability have a strong influence on the critical density and the traffic flow greatly .

计算中，通过假设等离子体密度的双线性分布而考虑了临界密度面附近的密度轮廓变陡效应。

In calculation , the effect of density profile steepening in the vicinity of the critical density has been taken into account by assuming a bilinear density profile .

然后介绍在岩体不同层次上变形破坏的自相似特性及破坏的临界密度指数分形特性。

Then , the self-similarity of deformation and fracture of rock mass at different structural hierarchies and the fractal natures of the concentration parameters of fracture are introduced .

根据为改进大爆炸理论而发展出来的暴胀理论，宇宙密度必定接近于临界密度，所以宇宙应是平坦的。

As an extension of the big bang theory , inflation theory predicts the universe density is rather close to the critical density . thus , the universe is flat .

模拟结果表明：超强激光能够在较低密度等离子体中形成准直的抛物形密度分布的通道，但在近临界密度处，等离子体中通道很快出现偏折。

Simulation results show that ultra-intense laser can form quasi-straight channel with a parabolic density profile in relatively lower density plasma and the channel soon became deflected in near-critical density plasma .

此外，模拟结果也表明了交通信号周期对最大流量和临界密度的影响，最大流量随交通信号周期的增大而减小，临界密度随交通信号周期的增大而增大；

Moreover , the cycle time of traffic signal has much influence of maximum flux and critical density . Maximum flux decreases with increased , while critical density increases with increased .

本文指出，应用Poincare's引力规范理论，考虑时空挠率对宇宙临界密度的修正，能使我们从另一途径、寻找失踪的质量。

In this article , we use Poincare 's gauge theory of gravitation to modify the cosmic critical density in order to search for the missing mass . The positivity of the modified critical density is discussed .

与传统的服务水平评价不同，采用能够综合反映道路管理者和道路使用者共同要求的评价指标&临界密度比对城市快速路基本段的运行状况进行评价；

Different from the typical evaluation index-level of service , this paper adopts critical density ratio to evaluate the operation condition of urban highway basic sections , which synthetically reflects the requests of both road managers and users .

发现了合作频率在双道情形会发生一阶相变：系统密度小于临界密度时，非合作频率随时间呈指数衰减，而大于临界密度时，演化一段时间后非合作频率则保持为一常数。

We find a first-order phase transition of cooperators fraction in two-lane system , in which defectors fraction decays exponentially when system density is less than the critical density , otherwise it remains constant after a period of evolution .

讨论了利用飞秒激光在材料表面通过非线性光电离和雪崩电离激发自由载流子密度达到临界密度，并在材料表面形成等离子体的物理过程。

The research is on the exciting the free carriers to reach the critical density through the process of multi-photon ionization and avalanche ionization by using the femtosecond laser on the surface of the materials and the process of the surface plasma formation .

分析发现，在存在预通道的情况下，当等离子体通道的密度大于临界密度很多时（例如20倍临界密度），即使是在激光波长量级的通道中，激光仍然可以传播。

It is proved that if there is a preformed channel , the laser pulse can still propagate in the channel of pulse-duration order , even if the plasma density is much higher than the critical density ( e.g.20 times critical density ) .