新型含氟液晶-8.1-[(4-乙基-联苯基)2-(4-烷氧基-2,3,5,6-四氟苯基)乙炔的合成及相态研究(英文)

设计、合成了1-(4’-乙基-联苯基)2-(4-烷氧基-2,3,5,6-四氟基苯基)乙炔的液晶化合物。用偏光显微镜以及DSC确定了它们的液晶相态,它们均为向列相液晶,并与相类似全碳氢类液晶化合物进行比较。     

1-[对-(反式-4-正烷基环已基)苯基]-2-(对-硫代异氰酸苯基)乙烷类新型液晶的合成研究

本文合成了结构式为的液晶化合物,提供了1-[对-(反式-4-正烷基环已基)苯基]-2-(对-硫代异氰酸苯基)乙烷类液晶化合物的合成路线。合成的化合物经光谱测试及元素分析确证,同时测定了它的相变温度和介电各向异性参数。     

新型含氟液晶-2 4-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸苯酚酯的合成和液晶行为研究(英文)

研究液晶性能与分子结构之间的关系具有十分重要的意义。本文以1-五氟苯基-2-三甲硅基乙炔为起始原料,合成了4-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸苯酚醇一类新型化合物。通过正交偏光显微镜观察研究,发现所得到的化合物是新型的单变向列型液晶。本文亦考察了端基对液晶行为的影响。     

4’-溴苯基4”-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苄基醚的合成及相变研究

本文报导了一类新型含全氟苯炔类液晶化合物4’-溴苯基4”-[4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苄基醚的合成方法及相交性质,并讨论了结构与性能的关系。     

新型含氟液晶的合成及相态研究

设计、合成了4’-[(4-烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸4”-甲基苯酚系列的液晶化合物.进行了结构分析.确证其结构.测定了它们的相变温度,确定了它们的液晶相变类型.     

新型含氟液晶-3,4-(4’-正烷氧基-2,3,5,6-四氟联苯基-4-乙炔基)苯甲酸4-氯苯酚酯的合成和液晶行为研究(英文)

设计和合成新型含氟液晶化合物并对其性能进行考察,将有助于扩大人们对液晶及其器件应用等方面的科学理解。本文以1-五氟苯基-2-三甲硅基乙炔为起始原料,合成了4-(4’-正烷氧基-2,3,5,6-四氟联苯基-4-乙炔基)苯甲酸4-氯苯酚酯一类新型化合物。通过正交偏光显微镜观察研究,发现所得到的化合物是呈现高度稳定的近晶A相和向列相的新型互变液晶。分子结构对液晶行为的影响也在本文中得到考察。     

4-[4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苄氧基苯甲酸正戊酯的合成及相变研究

本文报导了一类新型含全氟苯炔类液晶化合物4-[4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苄氧基-苯甲酸正戊酯合成及相变性质,并讨论了末端碳链对相变性质的影响。     

新型含氟液晶-1 4-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸 4-正戊氧羰基苯酚酯的合成和液晶性质研究(英文)

骨架结构中含有多氟原子的液晶,由于在改善熔点、粘度、双折射率及介电子向异性等物理性能方面具有明显的优点,而越来越受到人们的重视。本文以1-五氟苯基-2-三甲硅基乙炔为起始原料,合成了4-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸4-正戊氧羰基苯酚酯一类新型化合物。通过正交偏光显微镜观察的研究结果表明,所得到的化合物是呈现近晶A相和向列相的新型液晶。端基对液晶行为的影响也在本文中得到讨论。     

新型含氟液晶-7.4''''[(4-烷氧-2,3,5,6-四氟苯基)乙炔基]苯甲酸4”-烷氧基苯酚酯的合成及相态研究(英文)

设计、合成了4’-[(4-烷基-2,3,5,6-四氟苯基)乙炔基]苯甲酸4”-烷氧基苯酯系列的液晶化合物,进行了结构分析,确证其结构,测定了它们的相变温度,确定了它们的液晶相变类型,它们具有向列相和近晶C相。     

新型含氟液晶-6.4''''[(4-烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸4”-溴苯酚酯的合成及相态研究(英文)

设计并合成了4’-[(4-烷氧基-2,3,5,6-四氟苯基)乙炔基]苯甲酸4”-溴苯酚酯系列的液晶化合物。经IR、MNR、MS及元素分析,确证其结构,测定了它们的相变温度,结果表明它们具有向列相和近品A相。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks