高温空气煤粉直燃技术的数值模拟

本文通过数值计算的方法,对高温空气煤粉直燃燃烧器的多种运行工况进行了数值试验研究,分析了煤粉气流入口速度、煤粉浓度和高温空气速度等主要因素对煤粉气流着火的影响,模拟结果还可以反映出高温空气无油点火燃烧器内的流动、燃烧和传热情况。与试验数据的对比分析表明,数值模拟结果与试验数据趋势一致。研究结果对此燃烧器的结构及运行参数的优化提供了指导。     

Disruption mitigation using laser ablation of high-Z impurities in HL-1M tokamak

A preliminary experiment triggering a plasma current quench by laser ablation of high-Z impurities has been performed in the HL-1M tokamak. The injection of impurities with higher electric charges into tokamak plasmas can increase the radiation cooling of the plasma. Resistive, highly radiating plasma formed prior to the thermal quench can dissipate both the thermal and magnetic energies, which is possibly a simple and potential approach to reducing significantly the plasma thermal energy and magnetic energy before a disruption thereby a safe plasma termination is obtained.     

数学问题解答

2006年11月号问题解答(解答由问题提供人给出)1641如图,BC是半圆O的直径,AC⊥BC于C,AD切半圆于D,设圆的半径为r,且BD OA=29r,求:AD.(安徽省肥西中学刘运宜231200)解连结OD、CD.因为AD是半圆O的切线,所以OD⊥AD,即∠ADO=90°.又因为AC⊥BC,所以∠ACO=90°,所以∠ADO ∠ACO=180°     

衍射光栅的实验设计

本文介绍了一种用可调角度双面镜产生相干光的干涉方法制做衍射光栅，所用仪器不多，光路简明     

冷等离子体表面改性设备的研制

本文介绍了一个新的冷等离子体表面改性设备，它集辉光放电和电晕放电于一体，可根据研究工作需要，采用不同的放电形式和工作气体，可满足材料表面改性的机理性研究和小批量产品开发的需要，实验结果表明，该设备结构合理，性能可靠．     

RIBLL1终端实验装置

描述了一套HIRFL的放射性核次级束流引起反应测量的实验装置,它由RIB鉴别、测量系统、次级靶控制系统和次级反应产物鉴别、测量系统组成.高增益分组延迟线读出、重心定位PPAC,横向场IC,椭球面镜聚焦、PMT读出、闪烁薄膜时间拾取器,双叠层纵向场阳极分条读出IC,PMT矩阵读出x—y位置灵敏Phoswich闪烁探测器,康普顿抑制HpGeγ探测器等单元是这套装置的基本部件.目前,该装置已安装在兰州重离子加速器RIBLL1终端.性能测试和实验研究正在进行.     

First Discovery of the Earliest Angiospermous Megafossils in the World

The first discovery of the earliest angiospermous megafossils, so far in the world,was made by the authors from the Lower Cretaceous Chengzihe Formation of Jixi Basin, eastern Heilongjiang Province,China.Among the angiospermous fossils there are 5 species belonging to 5 genera (including 4 gen.et sp.nov.) reported in this paper.Their microphyllous leaves with irregular venations show the characteristics of some primitive angiosperms whose age is mostly corresponding to the late Hauterivian-early Barremian, partly proved by the underlying conformably marine beds with the Valanginian-Hauterivian dinoflagellates revealed newly also by the authors.     

INFLUENCE OF IN-PLANE FIELD ON THE STABILITY OF VERTICAL BLOCH LINE CHAINS IN HARD DOMAINS OF GARNET BUBBLE FILMS

The stability of vertical Bloch line (VBL) chains was statistically studied for all three types of bard domains in garnet bubble films subjected to an in-plane field H_ip. With a set of integrate data taken from seven bubble samples and with two typical figures of a sample, four main features of the behavior of VBL chains subjected to H_ip were summarized.     

同时采用P矩阵法和多波长直线回归法测定脑清片中两组分的含量

本文经选择适当的测定波长，同时采用Ｐ－矩阵法和多波长直线回归法测定脑清片中氨基比林和咖啡因的含量。两个方法简便、快速、准确。样品测定结果均和北京市药品标准法测定结果一致。     

Modified Two-Scale Model for Electromagnetic Scattering from the Non-Gaussian Oceanic Surface

Based on the skewness of sea waves, a modified two-scale model is developed for the non-Gaussian sea surface scattering. In this new model, a complementary term is added to the first-order scattering coefficient of the classical small perturbation method （SPM）, the additional part is proportional to the surface bispectrum and it is the critical part in explaining the scattering difference between upwind and downwind observations. Meanwhile, the effects of the shadowing function of the anisotropic surface, the curvature of the surface are also taken into account. The numerical results show the theoretical estimates obtained are consistent with the experimental result, and the influence of the wind speed, the trend and the incident frequency on the backscattering coefficients from the non-Gaussian oceanic surface is discussed in detail.