一种近共心稳定腔气体拉曼激光器

本发明为一种采用气体拉曼介质的内腔式拉曼激光器，由左凹面腔镜（对基频激光高反射），基频激光介质，基频激光调Q单元，基频激光介质泵浦源，二相色镜（对基频激光高透射，对拉曼激光高反射），拉曼池，右凹面腔镜（对基频激光高反射，对拉曼激光透射率为T）和拉曼激光全反镜共八部分组成。本发明中基频激光的束腰位置在拉曼池内，因此拉曼池内的基频激光光束小，功率密度大，有利于提高拉曼转化效率；激光介质处基频光的光束半径大，可以充分利用基频激光介质；另外两个凹面腔镜之间的距离L稍小于两腔镜曲率半径R1、R2之和，因此该谐振腔满足稳定腔条件，且其束腰半径非常小,功率密度大，可以有效降低拉曼转化阈值

The Research of Several Electrodes for SPE Water Electrolysis

研究了IrRu/Nafion117/PbAg、IrRu/Nafion117/Ni、IrRu/Nafion117/TiNi、Ag/Nafion117/Ni、C/Na-fion117/PtRu等5种三合一膜电极(MEA)的水电解性能.实验发现,上述各电极的阳极活性顺序为:IrRu>Ag>C,阴极为:Ni>PbAg>TiNi,TiNi的稳定性比Ni好很多,PbAg最为稳定.各电极的过电位均随温度的升高而下降,电流效率随电流密度的增大而提高.Performances of the IrRu/Nafion 117/PbAg,IrRu/Nafion 117/Ni,IrRu/Nafion 117/TiNi,Ag/Nafion 117/Ni and C/Nafion 117/PtRu for the SPE water electrolysis have been investigated.The order of the electrocatalysis activity for the anodic electrodes as mentioned above is IrRu>Ag>C,and that of cathodic electrode is Ni>PbAg>TiNi.While the stability of TiNi was much better than Ni,and that of PbAg is best.Moreover,the current efficiency was raised with the increase of current density.作者联系地址：表面物理与化学国家重点实验室,表面物理与化学国家重点实验室,表面物理与化学国家重点实验室,表面物理与化学国家重点实验室,表面物理与化学国家重点实验室 四川绵阳621900,四川绵阳621900,四川绵阳621900,四川绵阳621900,四川绵阳621900Author's Address: State Key Laboratory of Surface Physics and Chemistry,Mianyang 621900,Sichuan,Chin

Nanoscale periodic corrugation to dimple transition due to "beat" in a bulk metallic glass

We report an intriguing observation that the interaction of brittle nanoscale periodic corrugations (NPCs) can lead to the formation of ductile dimples on the dynamic fracture surface of a tough Vit 1 bulk metallic glass (BMG) under high-velocity plate impact. A “beat” phenomenon due to superposition of simple harmonic vibrations, approximately characterizing NPCs, is proposed to explain this unusual brittle-to-ductile transition. The present results agree well with our previously revealed energy dissipation mechanism in the fracture of BMGs

用于生命之树重建的数据集

由中国科学院计算机网络信息中心、中国科学院植物研究所、深圳市中国科学院仙湖植物园"三方两地"共同合作研究建设的"达尔文树"——分子数据分析应用环境(DarwinTree——Molecular Data Analysis and Application Environment),从中国陆地植物发育系统框架的研究出发,逐步推动解决生命之树构建过程中存在的技术难题,探索利用基因和基因组信息构建生命之树的策略和方法,研究和开发DNA序列信息自动采集和生命之树自动生成技术(Automatic Reconstruction of The Tree of Life),建立生命之树信息平台及其利用体系,为最终在我国建立具有国际影响的,能很好地兼容物种分类、地理分布、形态性状、化石信息以及DNA信息的物种库(Species Bank)创造条件。DarwinTree旨在为科研人员提供数据和分析并举的工作平台,该平台将承担数据汇集和面向实际科研工作应用的双重作用。本文发布的数据集包括:(1)DarwinTree基础数据集:来自国际公共序列数据的标记处理得到的分子标记数据及其与任意阶元物种分类名称对应的统计数据集;(2)DarwinTree自测序数据集:面向中国陆地植物研究的补充测序序列数据;(3)DarwinTree中国维管植物进化数据集:已构建的中国维管植物属系统发育树的数据(Generic tree of Chinese vascular plants)

2005～2015年CERN光合有效辐射数据集

光合有效辐射在生态学、农学以及气候学等多个学科中都有重要的应用价值。它是揭示物质与能量交换过程的基本生理变量,是光合潜力、潜在产量的评估研究和作物生长模拟研究、土壤碳的固定模拟研究中不可缺少的关键数据之一。该数据集涵盖了中国8个典型陆地生态类型、中国生态系统研究网络(CERN)下属的40个辐射观测站观测的光合有效辐射日均值,时间跨度为2005～2015年。通过对传感器的集中标定与规范的数据质量控制方案,保障了观测数据的可靠性与可比性。采用光谱仪、辐射标准灯传递辐射基准方案,对光合有效辐射传感器进行集中标定与比对,标定精度小于5%,符合世界气象组织(WMO)标准;采用极值法对观测的光合有效辐射数据进行质量控制

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies