抗滑桩阻力上下限解法

基于工程上常用的Janbu普遍条分法(GPS)和剩余推力法，提出了确定单排或多排抗滑桩抗滑阻力的上、下限计算方法。该法假定桩前、桩后滑动土体具有不同的稳定性系数，或假定桩前、桩后滑动土体具有不同的剩余推力，并且抗滑桩承受的下滑力是水平距离的函数。对于单排桩，借助于下限法可以通过试算确定其设桩范围；对于多排桩，借助于上限法可以通过有限的组合枚举确定其最佳的配置。上、下限法的结合可以巨大降低计算量，同时又能满足工程精度要求。运用该方法还可以确定不宜设置抗滑桩的位置范围。文中的算例展示了该方法的具体运用过程。

像差对星间激光通信相互对准误差的影响

We analyze mutual alignment errors due to wave-front aberrations. To solve the central obscured problem, we introduce modified Zernike polynomials, which are a set of complete orthogonal polynomials. It is found that different aberrations have different effects on mutual alignment errors. Some aberrations influence only the line of sight, while some aberrations influence both the line of sight and the intensity distributions. (c) 2005 Optical Society of America

掺铒氟（卤）磷碲酸盐玻璃的上转换发光性能研究

研究了掺铒氟（卤）磷碲酸盐玻璃的吸收光谱和上转换荧光光谱，探讨了Er^2＋在氟（卤）磷碲酸盐玻璃中的上转换发光机理．在975nm激光二极管抽运下产生强烈的上转换红光及绿光。且红光的发光强度要远远大于绿光．以PbCl2取代PbF2后，红光的发光强度下降，而绿光却没有明显变化；以ZnCl2取代ZnF2达5mol％时，红光和绿光的发光强度均明显增大．

西双版纳热带雨林聚果榕小蜂的传粉生态学

对聚果榕小蜂 (Ceratosolensp )传粉生态学进行了首次研究。结果表明 ,聚果榕小蜂的雄蜂比雌蜂早羽化数小时 ;雌蜂羽化不能自行打开瘿花和果肉出蜂口 ,两个出蜂口均需雄蜂开凿。而聚果榕的成熟花粉 ,不能自行地从开裂处散发出来 ,必须经榕小蜂的繁殖性雌蜂采集才能散到表面。羽化后的雌蜂在开裂的雄花中不停地用触角柄节、口器上颚和足推动和采集花粉。雌蜂飞出熟榕果寻找嫩隐头花果 ,一般在外飞翔 5～ 80min。雌蜂进入嫩聚果榕的隐头花果内后 ,立即把粘附在足、头、触角和身上的花粉不停地推动到长柱头雌花中 ,授粉行为长达 4～ 9h。然后 ,才把卵产在短柱头雌花中

内变形虫类(Entamoeba)的进化地位

内变形虫类不仅因其寄生致病性而长期备受关注, 它们的进化地位也是一个十分令人注目的问 题. 由于曾认为其不具线粒体等细胞器, 有人将其与其他的“不具线粒体”的原生动物统称为archezoa, 认为它们是在线粒体产生之前即已分化的极原始真核生物, 处在原核生物向真核生物的过渡阶段. 然 而, 近年来的研究表明, 内变形虫类是具有线粒体等细胞器的, 其线粒体可能特化成了后来才发现的 crypton 或mitosome. 近来的分子系统研究也表明, 它们应该是具有(或曾经具有)线粒体的. 我们的 DNA 拓扑异构酶Ⅱ分子系统分析明显显示它们的分化应该是在很多具线粒体的生物分化之后. 本文就 这些研究情况进行了较全面的概述,并对其进化地位进行了进一步分析探讨.

圆形碘孢虫完整孢子ELISA的建立

探索建立鱼类寄生圆形碘孢虫(MyxobolusrotundusNemezek,1911,Myxosporea,Bivalvulida)完整孢子酶联免疫吸附试验(Enzyme linkedimmunosorbentassay,ELISA)检测的可行性,对丙酮、戊二醛、甲醛、多聚甲醛、乙醇等几种常用固定剂应用于此方法的效果进行评价,初步建立了针对鱼类黏孢子虫的完整孢子ELISA检测模式。结果显示,同比其他几种固定剂,2%的多聚甲醛、0 25%的戊二醛对圆形碘孢虫完整孢子ELISA有较好的效果,经二者固定后,最

Ultracompact triplexer by coupling and decoupling of multiple photonic crystal waveguides

We investigate numerically the self-imaging effect in a system of multiple coupled photonic crystal waveguides (M-CPCWs) with asymmetric coupling. Then two couplers of 2-CPCWs and 3-CPCWs are cascaded to form an ultracompact triplexer by employing coupling and decoupling of M-CPCWs. The wavelength of 1310 nm propagates along the input direction because the M-CPCWs are decoupled at the same decoupling frequency. The other two wavelengths (1490 and 1550 nm) are separated by combining multimode interference and the dual mode coupling effect. Only by introducing a single defect near the crossing point between two output photonic crystal waveguides (PCWs) are the high extinction ratios for the three wavelengths achieved simultaneously.

Proposal of an Ultracompact Triplexer Using Photonic Crystal Waveguide with an Air Holes Array

We propose an ultracompact triplexer based on a shift of the cutoff frequency of the fundamental mode in a planar photonic crystal waveguide (PCW) with a triangular lattice of air holes. The shift is realized by modifying the radii of the border holes adjacent to the PCW core. Some defect holes are introduced to control the beam propagation. The numerical results obtained by the finite-difference time-domain method show that the presented triplexer can separate three specific wavelengths, i.e. 1310, 1490 and 1550 nm with the extinction ratios higher than - 18 dB. The designed device with a size as compact as 12 mu m x 6.5 mu m is feasible for the practical application, and can be utilized in the system of fiber to the home.

Fabrication of triplexers based on flattop SOI AWG

A triplexer is fabricated based on SOI arrayed waveguide gratings (AWGs). Three wavelengths of the triplexer operate at different diffraction orders of an arrayed waveguide grating. The signals of 1490 nm and 1550 nm, which are input from central input waveguide of an AWG, are demultiplexed and the signal of 1310 nm, which is input from central output waveguide of an AWG, is uploaded. The tested results show that the downloaded and uploaded signals have flat-top response. The insertion loss is 9 dB on chip, the nonadjacent crosstalk is less than -30 dB for 1490 nm and 1301 nm, and is less than -25 dB for 1550 nm, the 3 dB bandwidth equates that of the input light source.

Novel triplexing-filter design using silica-based direction coupler and an arrayed waveguide grating

A new triplexing filter based on a silica direction coupler and an arrayed waveguide grating is presented. Using a combination of a direction coupler and an arrayed waveguide grating, a 1310-nm channel is multiplexed and 1490- and 1550-nm channels are demultiplexed for fiber-to-the-home. The direction coupler is used to coarsely separate the 1310-nm channel from the 1490- and 1550-nm channels. Subsequently, an arrayed waveguide grating is used to demultiplex the 1490- from 1550-nm channel. The simulated spectra show the 1-dB bandwidth of 110 nm for the 1310-nm channel and 20 and 20.5 nm for the 1490- and 1550-nm channels. The insertion loss is only 0.15 dB for 1310 nm and 5 dB for 1490 and 1550 nm. The crosstalk between the 1490- and 1550-nm channels was less than -35 dB. (C) 2009 Society of Photo-Optical Instrumentation Engineers. [DOI 10.1117/1.3065508]

Investigation of mode coupling in a microdisk resonator for realizing directional emission

Mode coupling between the whispering-gallery modes (WGMs) is numerically investigated for a two-dimensional microdisk resonator with an output waveguide. The equilateral-polygonal shaped mode patterns can be constructed by mode coupling in the microdisk, and the coupled modes can still keep high quality factors (Q factors). For a microdisk with a diameter of 4.5 mu m and a refractive index of 3.2 connected to a 0.6-mu m-wide output waveguide, the coupled mode at the wavelength of 1490 nm has a Q factor in the order of 10(4), which is ten times larger than those of the uncoupled WGMs, and the output efficiency defined as the ratio of the energy flux confined in the output waveguide to the total radiation energy flux is about 0.65. The mode coupling can be used to realize high efficiency directional-emission microdisk lasers. (C) 2009 Optical Society of America

A DSWN-based specific-purpose neural computing system

The Double Synapse Weighted Neuron (DSWN) is a kind of general-purpose neuron model, which with the ability of configuring Hyper-sausage neuron (HSN). After introducing the design method of hardware DSWN synapse, this paper proposed a DSWN-based specific purpose neural computing device-CASSANN-IIspr. As its application, a rigid body recognition system was developed on CASSANN-IIspr, which achieved better performance than RIBF-SVMs system.

Fabrication of a novel silica PLC hybrid integrated triplexer

A new-style silica planar lightwave circuit (PLC) hybrid integrated triplexer, which can demultiplex 1490-nm download data and 1550-nm download analog signals, as well as transmit 1310-nm upload data, is presented. It combines SiO2 arrayed waveguide gratings (AWGs) with integrated photodetectors (PDs) and a high performance laser diode (LD). The SiO2 AWGs realize the three-wavelength coarse wavelength-division multiplexing (CWDM). The crosstalk is less than 40 dB between the 1490- and 1550-nm channels, and less than 45 dB between 1310- and 1490- or 1550-nm channels. For the static performances of the integrated triplexer, its upload output power is 0.4 mW, and the download output photo-generated current is 76 A. In the small-signal measurement, the upstream 3-dB bandwidth of the triplexer is 4 GHz, while the downstream 3-dB bandwidths of both the analog and digital sections reach 1.9 GHz.