以太网IP QoS实现模型及方案研究

在分析当前IP QoS的基本实现模型的基础上,以华为S3500系列交换机为例介绍了QoS具体实现方案,对以太网的IP QoS解决方案进行初步的讨论和研究.     

Synthesis and adsorption properties for Au(Ⅲ) of alkoxycarbonyl thiourea resin

A novel alkoxycarbonyl thiourea resin(ATR) was synthesized by monomer polymerization of oxydiethane-2,1-diyl dicarbonisothiocyanatidate and polyethylene polyamine, and characterized by FT-IR. The adsorption properties of ATR were investigated by batch test. The adsorption capacities for Au(Ⅲ), Ag(Ⅰ), Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅲ), Ca(Ⅱ) and Mg(Ⅱ) are 4.65, 4.40,0.40, 0.90, 0.86, 0.0080 and 0.016 mmol/g, respectively, when the adsorption condition is as follows: contact time 24 h, temperature 30 ℃, initial concentration of Au(Ⅲ) 5.08 mmol/L and that of other metals 0.10 mol/L, and concentration of acid 1.0 mol/L. The adsorption capacity for Au(Ⅲ) increases with the increase of contact time, temperature and initial concentration of Au(Ⅲ). The capacity after five adsorption-desorption cycles remains 90% that of the first time, and the separation factors of ATR for binary metal ion solutions are larger than 995, indicating that ATR is of good regeneration property and selectivity. XPS results show that the functional atoms of ATR supply electrons for Au and coordinate with Au during the adsorption.     

Self-assembling Synthesis of Vanadium Oxide Nanotubes and Simple Determination of the Content of Ⅴ(Ⅳ)

High-yielding low-cost vanadium oxide nanotubes were prepared by the hydrothermal self-assembling process from vanadium pentoxide and organic molecules as structure-directing templates. Moreover, a new method was discovered for determining the content of V (Ⅳ) in vanadium oxide nanotubes by thermogravimetric analysis ( TGA ). This method is simple, precise and feasible and can be extended to determine the content of low oxidation state in the other transition metal oxide nanomaterials.     

苯乙烯—丙烯腈连续共聚合多目标最佳化分析

利用动力学分析法建立了苯乙烯(S)-丙烯腈(AN)共聚产物的多种性能指标与连续搅拌反应器(CSTR)操作条件关系的模型。把结合逻辑分析的无干扰集合这种分析多目标最优化问题的手段应用于预示上述关系的最优化条件,取得了苯乙烯-丙烯腈共聚过程最优化计算的初步成功。     

Central Discontinuous Galerkin Method for the Navier-Stokes Equations

Central discontinuous Galerkin (CDG) method is used to solve the Navier-Stokes equations for viscous flow in this paper. The CDG method involves two pieces of approximate solutions defined on overlapping meshes. Taking advantages of the redundant representation of the solution on the overlapping meshes, the cell interface of one computational mesh is right inside the staggered mesh, hence approximate Riemann solvers are not needed at cell interfaces. Third order total variation diminishing (TVD) Runge-Kutta (RK) methods are applied in time discretization. Numerical examples for 1D and 2D viscous flow simulations are presented to validate the accuracy and robustness of the CDG method.     

600MW机组热控非停事件的研究

6000MW机组热控技术的顺利的开展和安全生产目标的确立，对于防止因机械运行而造成的非停机械事故，我们要秉承安全第一，规定制定严格遵守和规范，确保零非停事件和无人身安全问题的产生，这主--注意和研究的是加强热控人员的责任性，保证机械系统的性能增强，从而保证可以不发生非停事件，但一旦发生非停事件，我们应该如何应对与解决处理，防范于未然，也是在发电机组在热控效应下要研究的问题。     

LR(k)语法的特征

给出了LR(k)语法的一个特征.基于这一特征,LR(k)语法的判定和分析算法更容易实现.     

Fabrication and characterization of amorphous ITO/p-Si heterojunction solar cell

Amorphous indium-tin-oxide(a-ITO) film was deposited by radio-frequency(RF) magnetron sputtering at 180°C substrate temperature on the texturized p-Si wafer to fabricate a-ITO/p-Si heterojunction solar cell.The microstructural,optical and electrical properties of the a-ITO film were characterized by XRD,SEM,XPS,UV-VIS spectrophotometer,four-point probe and Hall effect measurement,respectively.The electrical properties of heterojunction were investigated by I-V measurement,which reveals that the heterojunction shows strong rectifying behavior under a dark condition.The ideality factor and the saturation current density of this diode are 2.26 and 1.58×10-4 A cm-2,respectively.And the value of IF/IR(IF and IR stand for forward and reverse currents,respectively) at 1 V is found to be as high as 21.5.For the a-ITO/p-Si heterojunction solar cell,the a-ITO thin film acts not only as an emitter layer,but also as an anti-reflected coating film.The conversion efficiency of the fabricated a-ITO/p-Si heterojunction cell is approximately 1.1%,under 100 mW cm-2 illumination(AM1.5 condition).And the open-circuit voltage(Voc),short-circuit current density(J SC),filll factor(FF) are 280 mV,9.83 mA cm 2 and 39.9%,respectively.Because the ITO film deposited at low temperature is amorphous,it can effectively reduce the interface states between ITO and p-Si.The barrier height and internal electric field,which is near the surface of p-Si,can effectively be enhanced.Thus we can see the great photovoltaic effect.     

微分中值定理的一种推广形式及其几何意义

国内各教科书在讲述微分中值定理时,其中有一个公共的条件是:在开区间(a.b)内可导,而文献[1]对此进行了推广,从而使微分中值定理在应用的范围上有了很大的拓广,本文首先介绍了拓广后的微分中值定理.其次主要在几何意义上给以探讨.     

国内外油菜籽脱皮(壳)冷榨生产技术比较

对德国德宜宝油磨坊公司的菜籽心油生产技术和我国油菜籽脱皮冷榨生产纯天然菜籽仁油的技术进行分析比较。指出我国研制的生产工艺及设备完全可以达到国外的技术水平,生产出高档优质的食用油。     

遗传算法与ICA相结合的多姿态人脸识别算法

为了解决多姿态人脸识别问题,提出了基于独立成分分析（ICA）进行正面人脸合成的新方法。首先利用ICA提取不同姿态人脸的特征子空间,然后利用遗传算法（GA）优化不同姿态的特征子空间,最后利用通过训练得到的姿态转换矩阵得到代表待合成的正面人脸特征系数,并直接进行分类比较。通过实验,验证了新方法对人脸识别率有较大的提高,并进一步简化了识别过程。     

数字下变频中抽取滤波器的设计

数字下变频是软件无线电的关键技术之一,数字下变频的实现关键在于抽取滤波器的设计与实现.针对输入到数字下变频系统中的信号采样率很高的问题,选用积分梳状(CIC)滤波器与半带(HB)滤波器这两种比较特殊的滤波器来完成下变频采样速率的抽取以及信号滤波.通过比较分析影响CIC滤波器的特性参数,选取了优化CIC滤波器性能的一组参数,对其进行设计.为了减小了滤波器的采样点数,降低滤波器的成本,避免出现频率特性中的突跳,选用最优等波纹法设计HB滤波器.基于Systemgenerator的设计仿真与基于FPGA芯片的硬件设计,均可以有效地验证算法,但前者降低了实验成本,缩短了实验周期,而且设计更加实用.     

Adsorption of copper(Ⅱ) and chromium(Ⅵ) on diaspore

The adsorption of Cu(Ⅱ) and Cr(Ⅵ) on diaspore was studied with the help of X-ray diffraction analysis, BET measurement, zeta potential measurement and atomic adsorption spectrometry. The adsorption equilibrium almost reaches within 60 min. The adsorption isotherms of Cu(Ⅱ) and Cr(Ⅵ) could be well described by the Langmuir equation. The adsorption capacities of Cu(Ⅱ) and Cr(Ⅵ) are 1.944 and 1.292 mg/g, respectively. The adsorption percentage of Cr(Ⅱ) increases with the increment of solution pH, but the adsorption percentage of Cr(Ⅵ) decreases. This could be explained by zeta potential theoretical and electrostatic attraction between metal ions and diaspore surface.     

基于网络准备能力指数来分析我国信息化水平

在探讨全球网络准备能力指数的基础上,对部分国家的NRI排名进行了比较,着重分析了我国信息化水平的现状与存在的问题,目的在于对我国信息化水平方面存在的主要差距有一个清楚的认识,最后提出了相应对策与建议.     

C-Z算子的极大交换子的一个估计

借助于C-Z算子的核K(x,y)的性质得到了一类C-Z算子的极大交换子M#([b,T]f)(x)的一个估计.