Generating 10-40 MeV high quality monoenergetic electron beams using a 5 TW 60 fs laser at Tsinghua University

A unique facility for laser plasma physics and advanced accelerator research has recently been built at Tsinghua University. This system is based on a Tsinghua Thomson scattering X-ray source (TTX), which combines an ultrafast TW laser with a synchronized 45 MeV high brightness linac. In our recent laser wakefield acceleration experiments, we have obtained 10-40 MeV high quality monoenergetic electron beams by running the laser at 5 TW peak power. Under certain conditions a very low relative energy spread of a few percent can be achieved. Absolute charge calibration for three different scintillating screens has also been performed using the linac system.     

Observation of Atomic Emission Enhancement by fs-ns Dual-Pulse Laser-Induced Breakdown Spectroscopy

An experiment of a 500-fs KrF laser pulse incident upon a high density supersonic O2 gas jet synchronously with an ns frequency-doubled Nd：YAG laser pulse is performed in orthogonal configuration. Significant atomic emission enhancement of over forty-fold is observed with an optical multi-channel analyser. The enhancement effect is probably attributed to the different ionization mechanisms between fs and ns laser pulses.     

如何做好学校的德育工作

学校德育工作以培养学生爱国主义精神，公民意识和良好的社会公德和行为习惯，创新精神和实践能力为目标、以活动为载体、开展丰富多彩的教育活动，进行感恩教育、积极开展各奏主题教育活动，使学生学会做人、学会求知、学会生活、学会劳动、学会健体．学会审美，努力培养举止文明、日常礼仪，品德优良．心理健康的富有创新精神的一代新人。     

高职院校学生关键能力的界定及其培养

有关高职学生关键能力的定义,目前还不能准确界定。本文探讨了高职学生关键能力的界定、内涵及其培养。     

竹类植物在现代园林中的应用

竹类植物生性强健，枝繁叶茂，翠竹青青，千姿百态．集形态美，色彩美、音响美、风格美于一身，极具观赏性。以竹造园，竹因园而茂，园因竹而彰，以竹造景，竹因景而活，园因竹而显；在园林建设中应用盛广。本文就竹类植物在现代园林中的作用，应用原则和竹类植物的应用方式及配置方法进行了探讨。     

混凝土现浇结构中后浇带的设置及施工

混凝土现浇结构中的后浇带施工是通过设置后浇带,大体积混凝土可以分块施工,加快施工进度,缩短施工工期.本文从后浇带的设置、施工工艺、施工注意事项及措施等几个方面阐述了现浇混凝土施工中浇带的施工,论证了现浇混凝土结构中后浇带施工的实用性.     

高中新课程下的语文课堂教学评价

一、传统语文教学评价存在的问题与不足 长期以来,在语文教学评价方面存在评价目的片面、评价范围狭窄、评价手段单一、评价主体局限等诸多不足.在实施评价的具体过程中,也普遍存在着简单化、惟量化等弊端.     

Characteristics of anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic, extrinsic, and external electric-field induced spin-orbit couplings

The various competing contributions to the anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic,extrinsic and external electric-field induced spin-orbit coupling were investigated theoretically.Based on a unified semiclassical theoretical approach,it is shown that the total anomalous Hall conductivity can be expressed as the sum of three distinct contributions in the presence of these competing spin-orbit interactions,namely an intrinsic contribution determined by the Berry curvature in the momentum space,an extrinsic contribution determined by the modified Bloch band group velocity and an extrinsic contribution determined by spin-orbit-dependent impurity scattering.The characteristics of these competing contributions are discussed in detail in the paper.     

以创新思路开展企业的会计工作

现代企业会计工作是企业财务管理的基础、是企业基础经营信息归集的基础、是现代企业综合管理工作开展的基础。加强企业会计工作已经成为现代企业综合管理工作水提升的关键。以创新思路开展企业的会计工作能够有效促进企业财务管理工作的开展，促进企业的健康发展。文中就如何以创新思路开展企业的会计工作进行了简要论述。