Editorial

Ohne Zusammenfassung     

Temperature effects on the electrical conductivity of thiol encapsulated gold nanoparticle thin films

Presented in this paper are results demonstrating the irreversibility in conductivity changes seen for thin, Langmuir–Schaeffer deposited thiol encapsulated gold nanoparticle films raised to a high temperature. The conductivity changes from low values that rapidly increase at higher temperature, to values that remain high and are almost linear with temperature. Comparisons are made to the expected behavior predicted by the conventional model of electron hopping in metal nanoparticle films.     

The effect of water and guest hydrophobicity on the complexation of oligomers with solid α-cyclodextrin

α-Cyclodextrin (α-CD), a cyclic oligosaccharide, can form inclusion complexes (ICs) with polymer molecules in which α-CD molecules stack in the columnar crystal to form a molecular tube. Physical mixtures of α-CD powder and oligomeric liquids such as poly(ethylene glycol) (PEG) have been shown to spontaneously form an IC, which is accompanied by a solid-state α-CD phase transformation from the cage to the columnar crystal structure. In this paper, the phase transformation is tracked with wide-angle X-ray diffraction as a function of temperature, atmospheric water vapor content and the type of guest molecule. A first-order kinetic model is used to describe the kinetics of complexation. The time required to completely complex PEG200 (200 g/mol) at low water activities is greater than 300 h, whereas only a few hours are necessary at high water activities. Solid-state complexation of α-CD with a hydrophobic guest molecule (hexatriacontane, HTC), is also reported here for the first time. Slower complexation kinetics are observed for α-CD with HTC compared to PEG600 (600 g/mol).     

Modified Binary Multiplier Architecture to Achieve Reduced Latency and Hardware Utilization

Wireless Personal Communications - Arithmetic Logic Units (ALUs) are very important components of the processor, which performs various arithmetic and logical operations such as multiplication,...     

特高压直流输电设备设计综述

高压直流输电已发展成为成熟的技术,典型的电压等级为士500kv。在中国正在运行的几个直流系统中,单条直流系统完整双极的输送容量已达3GW。同时,还有几个电压等级为800kv的UHVDC系统正在建设中,并计划从2009年中期开始陆续投入商业营运。在±800kV直流运行电压基础上,随着通电流能力的不断增加,直流系统的输电能力将会达到双极7．2GW的输送容量。电力技术的长足进步,有赖于强有力的HVDC换流站设备设计的研发工作和长期以来积累的设备制造经验。文章总结了设备设计技术攻关方面的难点,并介绍了UHVDC换流站设备技术的现实情况。     

Efficient botnet herding within the Tor network

During 2013 the Tor network had a massive spike in new users as a botnet started using Tor hidden services to hide its C&C (Command and Control) servers. This resulted in network congestion and reduced performance for all users. Tor hidden services are attractive to botnet herders because they provide anonymity for both the C&C servers and the bots. The aim of this paper is to present a superior way that Tor hidden services can be used for botnet C&C which minimises harm to the Tor network while retaining all security benefits.