Superresolution imaging of DNA tetrahedral nanostructures in cells by STED method with continuous wave lasers

DNA tetrahedral nanostructures are considered to be uew nanocarriers because they can be precisely controlled and hold excellent penetration ability to the cellular membrane. Although the DNA tetrahedral nanostructure is extensively studied in biology and medicine, its behavior in the cells with nanoscale resolution is not understood clearly. In this letter, we demonstrate superrcsolution fluorescence imaging of the distribution of DNA tetrahedral nanostructures in the cell with a simulated emission depletion （STED） microscope, which is built based on a conventional eonfocal microscope and can t）rovide a resolution of 70 nm.     

在LHC上寻找希格斯粒子

 大型强子对撞机(Large Hadron Collider,简称LHC)2010 年3 月开始运行,对撞能量为7TeV,这是设计能量14 TeV 的一半。瞬时亮度从10²⁷cm^-2s^-1迅速上升,2010 年底达到10³²cm^-2s^-1,2011 年底达到10³³cm^-2s^-1,积分亮度有5/fb, 超过原来的预期。LHC 进入出成果阶段。     

安徽理工大学教师在纳米尖晶石型铁氧体材料制备及性能研究方面取得新进展

<正>安徽理工大学材料科学与工程学院刘银副教授采用一种改进的化学-共沉淀法规模化(日产公斤量级)合成了纳米尖晶石Ni-Zn、Co-Zn、Ni-Zn-Co铁氧体等粉体,突破了纳米铁氧体材料应用在粉体合成方面的瓶径,并采用微波烧结技术,实现了铁氧体材料低温快速烧结。相关研究成果已发表于J Am Ceram Soc(DOI:10.1111/j.1551-2916.2012.05437.x)(IF=2.272),Mater.Res.Bull.,2012,47:4174-4180.(IF=2.108)。     

凌力尔特Dust Networks无线传感器网络产品现已在国内市场销售

2012年9月11日,凌力尔特公司宣布其Dust Networks Smart Mesh无线传感器网络(WSN)产品现已进入中国市场。Dust Networks是一家超低功耗嵌入式无线传感器网络产品供应商,现为凌力尔特公司的一个业务部门。Dust Networks开创了时间同步网格协议,为Wireless HART和802.15.4e标准奠定了基础。Dust Networks是WSN领域公认的先驱,并且是企业Wireless HART技术的领先供应商。Dust Networks提供了具有先进网络管理及全面安全特性的可靠、     

MB9851OR／410／310／110等：MCU

富士通半导体（上海）有限公司推出第四波基于ARM CortexM3处理器内核的32位RISC微控制器的FM3系列新产品。产品包括高性能产品组、基本产品组、低功率产品组和超低功耗产品组四个类别，高性能产品组共有64款产品，包括MB98510R／410／310／110系列等。     

Alternating-current losses in two-layer superconducting cables consisting of second-generation superconductors coated by U-shaped ferromagnetic materials

Alternating-current losses in a two-layer superconducting cable, each layer being composed of 15 closely-spaced rectangular wires made up of second-generation superconductors when the ends of wires are coated by either a non-magnetic or strong ferromagnetic material having a U profile is numerically investigated. Computations are carried out through the finite-element method. The alternating-current losses do not increase significantly if the relative permeability of the coating is increased three orders of magnitude, provided that the current amplitude is less than half of the critical current in a superconducting wire. However, the losses are much higher for ferromagnetic coating if the amplitude of the applied current oscillating at 50 Hz is close to the critical current. The ferromagnetic coating is seen to accumulate the magnetic field lines normally on its surfaces, while the field lines are parallel to the long axes of the wires, leading to more significant flux penetration in the coated regions. This facilitates a uniform low-loss current flow in the uncoated regions of the wires. In contrast, coating with a non-magnetic material gives rise to a considerably smaller current flow in the uncoated regions, whereas the low-loss flow is maintained in the coated regions. Moreover, the current flows in opposite directions in the coated and uncoated regions, where the direction in each region is converse for the two materials.     

脉冲电磁波在对称双槽上的散射特性研究

本刊讯随着亚波长光学的发展，人们对电磁波在具有凹槽的金属平面上发生的散射和共振进行了广泛而深入的研究，希望通过这些工作洞悉亚波长结构与电磁波作用的物理过程，并将成果应用于光学集成和人工材料的制造。为了简化问题，过去的研究绝大多数都是针对单色连续电磁波进行的，而对于更实际的脉冲电磁波鲜有涉及。     

“M系列”扬声器

高雅且精致的美学外观、强大且精准的音频性能：全新落地式、书架式，中置声道，环绕超低音音箱产品。 Boston Acoustics（波士顿声学）全新的M系列高性能扬声器将超凡的音响质量和高雅且极具美学吸引力的外观完美地结合在了一起，不仅为今天先进的多声道家庭影院系统，也为传统的双声道高保真音乐系统提供最理想的视听解决方案。     

Study of pure and semileptonic decays of Ds meson within R-parity violating supersymmetric model

We present the comaprative study of semileptonic and leptonic decays of Ds, D±and D0meson（D →M l＋-αl-β, D → l＋αlβ, D → l＋αvα;α,β=e,μ） within the framework of R-parity violating the（ Rp） Minimal Supersymmetric Standard Model（MSSM）. The comparison shows that combination and product couplings,（λβiα λ＊ ij qor λβqkλ＊αj k）contribution to the branching fractions of the said processes（under consideration） is consistent with or comparable to the experimental measurements in most of the cases. However, some cases exist where these contributions are highly suppressed. We identify such cases in our analysis and single out the important ones suitable for exploring in the future and current experiments.     

新型碳纳米复合材料实现太阳能化学储热

<正>开发新型太阳能热存储材料已成为探索太阳能高效利用的重要基础。近日,天津大学材料学院封伟教授带领的团队,通过化学结构设计,制备了具有高效光伏化学储热特性的偶氮苯/石墨烯复合材料,克服了传统光伏储热材料与技术存在存储密度低和装置体积庞大等局限性,为实现高密度、长效循环的太阳能储热提供了可能。该成果日前刊发在自然(Nature)出版集团旗下期刊《科学报告》(Scientific Reports)上。,,