以小麦再生苗叶片为外植体的愈伤组织诱导再生培养体系建立     

于惠敏  王文超  邵洪伟 《山东教育学院学报》2011,26(5):124-128

以小麦幼胚愈伤组织为外植体,研究继代培养时间、外源激素及叶片大小对小麦试管苗叶片愈伤组织诱导和再生的影响。结果表明：继代培养1～6个月的胚性愈伤组织,有较高的再生苗频率;当生长素浓度为2,4-D2mg／L＋NAA1mg／L、叶片高度为4cm时,小麦试管苗叶片愈伤组织的诱导率最高,从而建立了小麦试管苗叶片愈伤组织诱导和再生的培养体系。  相似文献   

《广绝交论》作意新探——兼论梁初荆州雍州两大集团的矛盾斗争     

邵春驹 《南京师范大学文学院学报》2011,(2):15-18

刘峻《广绝交论》明指到洽兄弟,实指梁武帝萧衍。萧衍齐末在雍州起兵,与荆州萧颖胄集团结成联盟,取得灭齐之战的胜利。然而荆雍两大集团间始终存在矛盾。天监三年,曹景宗等坐视原属荆州集团的司州刺史蔡道恭被围而不救,致使蔡于城中病死、司州陷落,便是这一矛盾的表现。刘峻因为得罪萧衍而仕途受阻,对萧衍衔怨很深,于是作此文暗讽。  相似文献   

Surface superconductivity in the type II Weyl semimetal TaIrTe4     

Ying Xing  Zhibin Shao  Jun Ge  Jiawei Luo  Jinhua Wang  Zengwei Zhu  Jun Liu  Yong Wang  Zhiying Zhao  Jiaqiang Yan  David Mandrus  Binghai Yan  Xiong-Jun Liu  Minghu Pan  Jian Wang 《国家科学评论(英文版)》2020,7(3):579

The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe₄ is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe₄. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe₄ that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (T_c) up to 1.54 K being observed. The normalized upper critical field h*(T/T_c) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe₄ provides a new novel platform to explore topological superconductivity and Majorana modes.  相似文献   

Superconductivity in chromium nitrides Pr3Cr10-xN11 with strong electron correlations     

Wei Wu  Kai Liu  Yanjie Li  Zhenhai Yu  Desheng Wu  Yuting Shao  Shihang Na  Gang Li  Ruizhen Huang  Tao Xiang  Jianlin Luo 《国家科学评论(英文版)》2020,7(1):21

Exploration of superconductivity in Cr-based compounds has attracted considerable interest because only a few Cr-based superconductors (CrAs, A₂Cr₃As₃ and ACr₃As₃ (A = K, Rb, Cs, Na)) have been discovered so far and they show an unconventional pairing mechanism. We report the discovery of bulk superconductivity at 5.25 K in chromium nitride in Pr₃Cr_10-xN₁₁ with a cubic lattice structure. A relatively large upper critical field of H_c2(0) ∼ 12.6 T is determined, which is larger than the estimated Pauli-paramagnetic pair-breaking magnetic field. The material has a large electronic specific-heat coefficient of 170 mJ K⁻² mol⁻¹—about 10 times larger than that estimated by the electronic structure calculation, which suggests that correlations between 3d electrons are very strong in Pr₃Cr_10-xN₁₁, and thus quantum fluctuations might be involved. Electronic structure calculations show that the density of states at the Fermi energy are contributed predominantly by Cr 3d electrons, implying that the superconductivity results mainly from the condensation of Cr 3d electrons. Pr₃Cr_10-xN₁₁ represents a rare example of possible unconventional superconductivity emerging in a 3D system with strong electron correlations. Nevertheless, clarification of the specific pairing symmetry needs more investigation.  相似文献   

学术期刊编辑思维定式的误区   总被引：2，自引：1，他引：2  

邵菊芳  沈惠云  张斯龙  何小军 《编辑学报》2005,17(2):87-88

当代一些学术期刊编辑受传统思维模式的影响和制约,形成了重整体、重综合、崇尚圣贤经典的价值取向,使办刊过程中产生了许多误区,刊物平庸无奇,缺少个性与生机.认为期刊要发展、要同世界接轨,必须调整和革新编辑的思维模式与价值取向.  相似文献   

浅谈纪录片创作实践教育的三个方面     

丁国蓉  邵斌 《新闻界》2007,(6):166-167

纪录片创作的实践教育将成为高校新闻传播教育的重要课题,理念教育建立复杂的真实观、素质教育培养道德修养、技术教育构建职业基础构成了纪录片创作教育的基本要素.  相似文献   

数字信息资源的组织管理及发展对策   总被引：11，自引：1，他引：10  

许少菲 《图书馆论坛》2002,22(2):60-62

文章讨论了数字信息资源的类型和特征，在此基础上探讨数字信息资源的获取整理等主要的组织管理方式，以及相关的发展对策。  相似文献   

书目著作的历史沿革与当前应变——喜见2006年《中国图书年鉴》出版有感     

吴永贵  邵琨 《出版科学》2007,15(1):94-96

本文在回溯我国书目著作历史沿革的基础上,对2006年卷《中国图书年鉴》主体部分的"年度重点书简介"栏目进行了分析,认为该栏目是适应时代需求的新型书目,在全面集中展示各年度图书出版精华,深度报道反映科学技术研究和文化艺术创作成果,为科研、教学和历史提供系统资料方面,发挥着重要作用.  相似文献   

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潘小任  邵葵  罗凤平  田学梅 《图书情报工作》1998,(11):57-59

分析《中国科学院图书馆图书分类法》（简称《科图法》）处于窘境的原因,呼吁加强对《科图法》的研究,并建议在文献工作中实行《科图法》和《中国图书馆图书分类法》（简称《中图法》）两法并用。  相似文献   

面向21世纪我国高校图书馆自动化管理系统的建设与发展思路   总被引：7，自引：0，他引：7  

邵晶  李人厚 《大学图书馆学报》1998,16(3):8-10

根据我国高校图书馆自动化管理系统的现状和与国外发达国家的差距,提出了面向２１世纪,我国高校图书馆自动化管理系统的建设与发展的思路和策略  相似文献