数字电源系统管理消除了“盲点”

尽管就新式电子系统的可靠工作而言，电源管理至关重要，但今天的系统中也许仍然存在最后一个“盲点”，那就是稳压器。因为对稳压器来说，没有方法直接配置或监视其关键电源系统的工作参数。因此，电源设计师一直被迫使用一堆混杂在一起的排序器、微控制器和电压监察器，     

条状过孔成大势所趋

对于28纳米及以下节点,选择和放置多种过孔类型的复杂要求对LEF/技术文件的布线构成了挑战,导致设计规则检查(DRC)错误增多(需要耗费时间来调试和改正),最终影响了成品率和性能。     

动态背光照明改善小型LCD面板的对比度和微调功率

背光液晶显示屏(LCD)在小到移动电话、大到电视机的许多消费类产品中均应用广泛。然而,往往发生很多关于对比度的投诉,尤其是黑电平问题。由于LCD需要背光照明,所以对于实际上不需要光的黑电平,则看     

科学家开发出石墨烯-硅光电混合芯片为超快芯片等应用开启大门

据物理学家组织网报道，美国哥伦比亚大学一项新研究证明石墨烯具有卓越的非线性光学性能，并据此开发出一种石墨烯一硅光电混合芯片。这种硅与石墨烯的结合，让人们离超低功耗光通信近了一步，让该技术在光互连以及低功率光子集成电路领域具有广泛的应用价值。相关论文发表在《自然·光学》杂志网站上。该研究团队由哥伦比亚大学的工程师和新加坡微电子研究所的研究人员组成。     

Air-breathing mode laser propulsion with a long-pulse TE CO_2 laser

Air-breathing mode laser propulsion experiment with a long-pulse transversely excited(TE) CO2 laser is carried out,and its ignition problem is solved with the ignition needle of lightcraft.Owing to the ignition needle,an order of magnitude reduction in the ignition threshold is demonstrated.The result is compared with previous study.The momentum coupling coefficient is also measured in the experiment and its dependence upon laser pulse energy(6-14 J) and pulse width(20,32,and 40μs) is discussed.     

Dipole bands in nucleus ~(139)Pm

High-spin states in nucleus 139Pm have been studied using the reaction 116Cd(27Al,4n)139Pm.Two dipole cascades have been found.Spin and parity assignments were based on the Directional Correlation of Oriented Nuclei(DCO) ratios and systematic behavior in neighboring odd-proton nuclei.The level structures of 139Pm are compared with those of the N =78 isotone 141Eu in which two dipole bands have been confirmed as magnetic rotational bands.The close similarity between them suggests that the dipole bands in 139...     

Structure of the even-even ~(78-84)Kr isotopes within SD-pair shell model

The collective properties in the even-even 78-84Kr isotopes have been studied within the framework of the SD-pair shell model.It is found that the collectivity of low-lying states in the even-even Kr isotopes can be described very well.     

Novel organometallic aromatic polyester based on ferrocene

<正>A novel polyester containing ferrocenyl was prepared by low-temperature interface polycondensation of 1,1'-ferrocenedicarboxylic acid chloride with 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one(DHPZ),which is a twisted non-coplanar heterocyclic bisphenol-like monomer.The newly generated polymer was evaluated based on characterization of its solubility,viscosity measurements,elemental analysis,FTIR spectroscopy,differential scanning calorimetric and thermogravimetric studies.     

ZTE,Telkom Kenya-Orange Announce Nations’Fastest Commercial HSPA+ Network

September 8, 2011, Shenzhen-ZTE Corporation, a publicly-listed global provider of telecommunications equipment and network solutions, and its partner, Telkom Kenya-Orange,launched Kenya’s fastest HSPA+ network, based on Uni-RAN, in Nairobi. The network allows Kenyans to access high-speed wireless     

Intrinsic ultracontractivity on Riemannian manifolds with infinite volume measures

By establishing the intrinsic super-Poincar'e inequality,some explicit conditions are presented for diffusion semigroups on a non-compact complete Riemannian manifold to be intrinsically ultracontractive.These conditions,as well as the resulting uniform upper bounds on the intrinsic heat kernels,are sharp for some concrete examples.