热镀锌工艺对Ti-IF钢光整热镀锌板组织和性能的影响

在连续热镀锌线上研究了RTH带钢温度和光整延伸率对Ti—IF钢光整热镀锌板组织和性能的影响。试验表明，当RTH带钢温度在830℃以下时，成品铁素体晶粒度为10．0级，织构类型以{332}、{114}为主，随着带钢温度的进一步提高，热镀锌板的晶粒逐渐粗化，织构成为典型的{111}织构，且取向密度增加，r值随之提高，但当带钢温度在900℃以上时，织构又趋于无规则分布，r值显著降低；光整延伸率对Ti—IF钢光整热镀锌板力学性能的影响很大，随着光整延伸率的提高，屈服强度明显提高，n值明显降低，延伸率降低，抗拉强度变化较小，且光整延伸率对性能的影响与成品铁素体晶粒尺寸有关，成品晶粒越粗，光整延伸率的影响越大。因此对于Ti—IF钢光整热镀锌板而言，n、r值是一对矛盾体，在制订热镀锌工艺时，需根据使用条件的不同，对其n、r值进行综合考虑。     

Interfacial hybridization kinetics of oligonucleotides immobilized onto fused silica surfaces

Fused silica optical fibers have been used in an intrinsic mode optical configuration as biosensors for fluorescence based detection of hybridization of nucleic acids. In this work, the kinetics of hybridization of single-stranded oligonucleotides that were covalently immobilized were studied. The probe DNA was dT₂₀, and the target was Fluorescein-labeled non-complementary (dT₂₀) or complementary (dA₂₀) oligonucleotide. Chronofluorimetric monitoring of the adsorption and hybridization processes was used to investigate oligonucleotide films of different density, in different salt concentrations, at temperatures of 25 and 40 °C, with the concentration of the target DNA being 0.005–0.1 μM. Mathematical models based on first- and second-order Langmuir adsorption have been examined to describe both the adsorption and the hybridization processes. Experimental data were processed using the models, and the hybridization kinetics were calculated. Hybridization kinetics on these optical fiber DNA sensors was found to be up to three orders faster than results presented for a number of other experiments using different immobilization chemistries.     

Realization of Tapered Waveguide by Stretching the Rod Waveguide

By stretching the rod waveguide with different velocities in opposite directions, the tapered waveguide can be fabricated. In condition of taking no account of volume expansion caused by heating and under the assumptions of volume conservation,the rod waveguide can be stretched freely in the heated region without being stretched outside of the heated region. A model,which shows the relation of the transition shape and the two factors, that is the ratio of two velocity and the heated region length, is presented for the shape of the taper transition through mathematic deduction. Based on this model, a desired tapered waveguide can be fabricated. The tapered waveguide are widely used for fabricating tapered fiber couplers and sensors. In addition, the conclusion can be used for fabricating fused fiber coupler.     

Experimental Research on Erbium-doped Superfluorescent Fiber Source

The effects of the variations in fiber length, fiber mirror reflectance on efficiency and output power are experimentally investigated for erbium-doped double pass backward superfluorescent fiber sources (SFSs). The influence of fiber length on mean wavelength stability (MWS) has also been demonstrated. By incorporating a short section of un-pumped erbium-doped fiber (EDF) at the output port, the pump power dependent on MWS becomes independent of pumped EDF length. This is a novel phenomenon that hasn‘t been reported up to now,and should be helpful to SFS fabrication and theory analysis. By using a fiber Michelson interferometer as spectrum slicing component,a multi-wavelength fiber source (MWFS) with ～20 channels (from 1542nm to 1559nm) is got. The MWFS has a channel spacing of ～0. 8 nm which satisfies ITUstandard. The intensity fluctuation among channels is less than 0.5dB,and the extinction ratio of all channels is above 14dB. This kind of MWFS should be useful to wavelength division multiplexing systems.     

Constitutive modelling and numerical simulation of multivariant phase transformation in superelastic shape‐memory alloys

This work concerns the micromechanical constitutive modelling, algorithmic implementation and numerical simulation of polycrystalline superelastic alloys under multiaxial loading. The model is formulated in finite deformations and incorporates the effect of texture. The numerical implementation is based on the constrained minimization of the Helmholtz free energy with dissipation. Simulations are conducted for thin tubes of Nitinol under tension–torsion, as well as for a simplified model of a biomedical stent. Copyright © 2004 John Wiley & Sons, Ltd.     

碳纤维复合材料柔性连续抽油杆开发及应用

碳纤维柔性连续抽油杆选用高性能碳纤维 ,以环氧树脂胶液为基体材料 ,添加一定配比的固化剂、促进剂和脱模剂 ,采用拉挤成型工艺制成 ,其开发的关键技术是连续成型、连接接头和安全保险装置。现场应用试验表明 ,TXC— 1、TXC— 2、TXC— 3三种规格的碳纤维柔性连续抽油杆能可靠应用于泵挂深度分别为 12 0 0、 180 0、 30 0 0m的直井和斜井中 ,实测比钢抽油杆节电 ,日产油量提高 。节能增产效果显著。     

聚乙烯丙纶复合防水卷材的特点及其应用

介绍了聚乙烯丙纶复合防水卷材的产品结构特点和性能特点、防水系统结构特点和配套材料、应用拼接技术以及产品应用范围。     

Sandwich panels with Kagome lattice cores reinforced by carbon fibers

Stretching dominated Kagome lattices reinforced by carbon fibers were designed and manufactured. The sandwich panels were assembled with bonded laminate skins. The mechanical behaviors of the sandwich panels were tested by out-of-plane compression, in-plane compression and three-point bending. Different failure modes of the sandwich structures were revealed. The experimental results showed that the carbon fiber reinforced lattice grids are much stiffer and stronger than foams and honeycombs. It was found that buckling and debonding dominate the mechanical behavior of the sandwich structures, and that more complaint skin sheets might further improve the overall mechanical performance of the sandwich panels.     

矿石中金的快速测定

研究了活性炭纤维滤布富集分离的条件和解脱方法,并利用微波溶样、液珠萃取比色法测定矿石中的金。该方法的测定范围为(0.5~xx)×10-6,相对标准偏差RSD为3.2%,可用于矿石中金的野外快速测定。     

抗裂合成纤维混凝土在尼尔基发电厂房工程中的应用

为了提高发电厂房水轮机混凝土蜗壳的抗裂、抗渗、抗冲击、抗震、抗冲耐磨性能，在尼尔基水利枢纽工程蜗壳混凝土的施工中掺加抗裂合成纤维，厂房项目部试验人员对蜗壳混凝土进行了掺加抗裂合成纤维（CTA Fiber）试验，试验结果及工程实际应用效果良好，提高了工程质量，支持了国家重点工程建设。