短脉冲泵浦类锂铝离子X射线激光模拟

建立了适合描述短脉冲激光泵浦类Ｌｉ离子产生Ｘ射线激光的简化流体和原子动力学模型。短脉冲激光泵浦纤维靶产生等离子体的电子密度、电子温度、电离态分布等和驱动激光功率密度、脉宽及纤维靶半径相联系。研究了类Ｌｉ铝离子４ｆ－３ｄ跃迁激光增益系数随时间的演化过程，以及峰值增益和泵浦激光功率、脉宽及纤维靶半径之间的关系。     

相对论效应产生的高次谐波

用单电子模型研究了相对论效应，特别是相对论坐标变换所引起的高次谐波，得到了谐波产生和激光强度的关系，还得到了谱分布和观测角的关系，特别给出了谱线强度分布的周期和观测角的关系。这一效应可以定性解释相对论强激光和固体靶相互作用所产生的高次谐波     

Demonstration of X-ray Thomson Scattering on Shenguang-Ⅱ Laser Facility

X-ray Thomson scattering technique for diagnosing dense plasma was demonstrated on Shenguang-Π laser facility.Laser plasma x-ray source of titanium He-α lines (～4.75keV),generated by laser beam (1.5kJ/527nm/2ns) heated titanium thin foil,was used as x-ray probe beam.The x-ray probe was then scattered by cold CH foam column of 1g/cm3 density.The scattered radiation at 90 was diffracted by polyethylene terephthalate (PET) crystal and recorded on x-ray charge-coupled device.Well-defined scattering spectra were obtained with good signal to noise ratio.     

Plasma Approach for Generating Ultra-Intense Single Attosecond Pulse

In our previous work,a plasma approach for single attosecond pulse (AP) generation was proposed.A few-cycle relativistic circularly polarized laser pulse will induce a single drastic oscillation of plasma boundary,from which high-order harmonics and furthermore an ultra-intense single AP can be generated naturally after it is reflected.Analytical model and simulations both demonstrate that the process is mostly efficient as the pulse duration is close to the plasma responding time.The effects of plasma density ramp are analyzed here,suggesting that the proposal is still quite efficient with appropriate density gradient in the ramp.At last,a combined approach is employed to obtain single AP with 30 fs incident laser.The relatively large-duration pulse is firstly shortened by a density dropping thin foil,and then reflected from an overdense plasma target.One-dimensional simulation shows that a 600 as single light pulse is generated with peak intensity of 3×1020W/cm2.     

充分认识加强仓储管理的重要性,努力提高食用植物油储备规范化管理水平

近年来,我国对粮食储备体系建设和管理十分重视,在粮食类储备方面取得了很大的成绩,但在食用植物油的储备方面还存在一些问题,特别是设施保障和仓储管理方面还不够完善.2007年和2010年受国际市场价格影响,国内食用植物油价格两次出现大幅攀升引起居民恐慌,出现囤积食用植物油现象,带来了一定的不良影响.     

The Electron Trajectory in a Relativistic Femtosecond Laser Pulse

In this report, we start from Lagrange equation and analyze theoretically the electron dynamics in electromagnetic field. By solving the relativistic government equations of electron, the trajectories of an electron in plane laser pulse, focused laser pulse have been given for different initial conditions. The electron trajectory is determined by its initial momentum, the amplitude, spot size and polarization of the laser pulse. The optimum initial momentum of the electron for LSS （laser synchrotron source） is obtained. Linear polarized laser is more advantaged than circular polarized laser for generating harmonic radiation.     

注重实效 推进粮油仓储信息化建设

本文针对粮油仓储信息化建设中存在的急于求成、追求大而全,企图一步到位等不切实际的倾向,在分析在我国粮油仓储业务目前发展阶段的基础上,提出必需尊重信息化发展规律,注重整体设计优化业务流程、构建可独立运行的功能模块、关注用户使用体验、持续改进应用系统等几个环节。并在各级粮油仓储业务流程管理中应用信息化技术提高管理水平,以使的信息化建设发挥实效。     

Standing Ultrashort Relativistic Solitons in Overdense Plasmas

By using a one-dimensional self-consistent relativistic fluid model, an investigation is made numerically on relativistic electromagnetic solitons with a high intensity in cold overdense plasmas with an electrons＇ initial velocity opposite to the laser propagating direction. Two types of standing solitons with zero group velocity are found at the given electrons＇ initial velocities. One is single-humped with a weakly relativistic intensity; the another is multi-humped with a strong relativistic amplitude. The properties of these two types of solitons are presented in detail.     

类钠锗离子软X射线光谱的理论计算

本文将原子结构的HFR方法与关于能量参数的最小二乘优化方法相结合,详细计算了类钠锗离子1s~22S~22p~6nl组态(n=3～6,l=0～5)电偶极跃迁的软x射线光谱(波长<30nm)。本文的波长计算值在误差范围内与实验十分符合,振子强度与Wiese等人的结果一致。     

移动式隧道窑的应用与探讨

移动式隧道窑作为我国烧砖窑炉中的新生事物，兼具隧道窑和轮窑两种窑型的优点，并且具有造价低廉、设计灵活的特点。本文以实际工程为例，通过与传统生产相比较，介绍了“移动式隧道窑”的特点。